/* Root Variables */
:root {
    --clr-bg-dark: #09001d;
    --clr-bg-medium: #0A3144;
    --clr-text-light: #E6F0FA;
    --clr-text-dark: #333;
    --clr-primary: #1E90FF;
    --clr-secondary: #ff1e44;
    --clr-secondary-darker: #ac2828;
    --clr-info: #2AB7CA;
    --clr-info-darker: #1A8299;
    --clr-success: #00a63d;
    --clr-error: #a60045;
    --clr-improvement: #ffa500;
    --clr-white: #fff;
    --clr-white-lowalpha: rgba(255, 255, 255, 0.3);
    --clr-black-shadow: rgba(0, 0, 0, 0.3);
    --clr-black-shadow-light: rgba(0, 0, 0, 0.1);
    --clr-white-shadow: rgba(255, 255, 255, 0.1);
    --clr-white-border: rgba(255, 255, 255, 0.2);

    --font-primary: 'Poppins', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --fs-base: 1.6rem;
    --fs-h1: clamp(4rem, 8vw, 7.8rem);
    --fs-h2: clamp(2.8rem, 5vw, 5rem);
    --fs-large: 1.8rem;
    --fs-medium: 1.7rem;
    --fs-small: 1.6rem;
    --fw-light: 300;
    --fw-normal: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 2.5rem;
    --spacing-xxl: 3rem;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-slide: 0.8s ease-in-out;
    --transition-flip: 0.6s ease;
    --transition-timing-smooth: cubic-bezier(0.4, 0, 0.2, 1);

    --z-background: -1;
    --z-default: 1;
    --z-content: 10;
    --z-popup: 90;
    --z-header: 100;
    --z-modal: 110;
    
    /* Animation Keyframes */
    --bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Global Resets & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 60%;
    height: 100%;
    overflow: hidden;
}

body {
    color: var(--clr-text-light);
    background: linear-gradient(180deg, var(--clr-bg-medium), var(--clr-bg-dark));
    height: 100%;
    font-family: var(--font-primary);
    font-size: var(--fs-base);
    line-height: 1.6;
    overflow: hidden;
}

/* Main Layout & States */
.main {
    min-height: 100vh;
    position: relative;
    background-color: transparent;
    transition: filter var(--transition-slow);
}

.main.blurred {
    filter: blur(5px);
    pointer-events: none;
}

.main.active {
    filter: blur(10px);
    pointer-events: none;
}

.main.loading {
    opacity: 0.7;
    pointer-events: none;
}

.main.loading::after {
    content: '';
    position: fixed;
    top: 50%;
    left: 50%;
    width: 50px;
    height: 50px;
    margin: -25px 0 0 -25px;
    border: 5px solid var(--clr-white-lowalpha);
    border-top-color: var(--clr-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.container {
    display: flex;
    height: 100vh;
    width: 200%;
}

/* Header & Navigation */
.header {
    background: transparent;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-lg) 10%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: var(--z-header);
    transition: background-color 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
}

.header.scrolled {
    background-color: color-mix(in srgb, var(--clr-bg-dark) 70%, transparent);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px var(--clr-black-shadow);
}

.logo {
    font-size: 3.2rem;
    color: var(--clr-white);
    text-decoration: none;
    font-weight: var(--fw-bold);
    filter: drop-shadow(0 0 5px var(--clr-bg-dark));
}

.navbar a {
    font-size: var(--fs-large);
    color: var(--clr-white);
    text-decoration: none;
    font-weight: var(--fw-medium);
    margin-left: 35px;
    transition: color var(--transition-medium);
}

.navbar a:hover,
.navbar a.active {
    color: var(--clr-primary);
}

/* Background Elements */
.stars-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: transparent;
    overflow: hidden;
    z-index: var(--z-background);
}

.star {
    position: absolute;
    background: var(--clr-white);
    border-radius: 50%;
    animation: meteor linear infinite;
    opacity: 0;
}

/* Home Section */
.home {
    position: relative;
    left: -50%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 var(--spacing-md);
}

.home-content {
    max-width: 60rem;
    display: flex;
    align-items: center;
    flex-direction: column;
}

.home-content h1 {
    font-size: var(--fs-h1);
    font-weight: var(--fw-bold);
    text-shadow: 0 0 5px var(--clr-black-shadow);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.home-content p {
    font-size: var(--fs-base);
    text-align: center;
    text-shadow: 0 0 10px var(--clr-black-shadow);
    margin-bottom: var(--spacing-xxl);
    max-width: 90%;
}

/* Module Selector */
.module-selector {
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.module-selector label {
    font-size: var(--fs-large);
    color: var(--clr-text-light);
    font-weight: var(--fw-medium);
    text-shadow: 0 0 5px var(--clr-black-shadow);
}

.module-selector select {
    width: 25rem;
    max-width: 90%;
    height: 4.5rem;
    padding: var(--spacing-sm);
    background: color-mix(in srgb, var(--clr-bg-dark) 80%, transparent);
    border: 1px solid var(--clr-white-border);
    border-radius: var(--radius-md);
    color: var(--clr-text-light);
    font-size: var(--fs-base);
    font-family: var(--font-primary);
    cursor: pointer;
    transition: background-color var(--transition-medium),
        border-color var(--transition-medium),
        box-shadow var(--transition-medium);
}

.module-selector select:focus {
    outline: none;
    border-color: var(--clr-primary);
    box-shadow: 0 0 8px color-mix(in srgb, var(--clr-primary) 50%, transparent);
}

.module-selector select option {
    background: var(--clr-bg-dark);
    color: var(--clr-text-light);
}



.button-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.home-content .btn {
    width: 19rem;
    height: 5.5rem;
    border: none;
    outline: none;
    border-radius: var(--radius-lg);
    font-size: var(--fs-large);
    color: var(--clr-white);
    letter-spacing: 1px;
    font-weight: var(--fw-semibold);
    cursor: pointer;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    transition: background-color var(--transition-medium) var(--transition-timing-smooth),
        box-shadow var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-fast) ease-out,
        filter var(--transition-medium);
}

.home-content .start-btn {
    background: var(--clr-primary);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-primary) 50%, black);
}

.home-content .learn-btn {
    background: var(--clr-secondary);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-secondary) 50%, black);
}

.home-content .download-qa-btn {
    background: var(--clr-info);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-info) 50%, black);
}

.home-content .progress-btn {
    background: linear-gradient(135deg, #7cb342, #8bc34a);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, #7cb342 50%, black);
}

.home-content .btn:hover,
.popup-info .btn-group .info-btn:hover,
.quiz-footer .next-btn.active:hover,
.buttons button:hover,
.home-learn-btn:hover,
.learn-navigation button:hover:not(:disabled) {
    transform: scale(1.03) translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    filter: brightness(1.1);
}

.home-content .start-btn:hover {
    background: var(--clr-primary);
    filter: brightness(1.2);
    box-shadow: 0 8px 20px color-mix(in srgb, var(--clr-primary) 40%, transparent);
}

.home-content .learn-btn:hover {
    background: var(--clr-secondary);
    filter: brightness(1.2);
    box-shadow: 0 8px 20px color-mix(in srgb, var(--clr-secondary) 40%, transparent);
}

.home-content .download-qa-btn:hover {
    background: var(--clr-info);
    filter: brightness(1.2);
    box-shadow: 0 8px 20px color-mix(in srgb, var(--clr-info) 40%, transparent);
    transform: scale(1.03) translateY(-2px);
}

.home-content .progress-btn:hover {
    background: linear-gradient(135deg, #8bc34a, #9ccc65);
    filter: brightness(1.1);
    box-shadow: 0 8px 20px color-mix(in srgb, #8bc34a 40%, transparent);
    transform: scale(1.03) translateY(-2px);
}

.home-content .btn:disabled,
.home-content .start-btn:disabled,
.home-content .learn-btn:disabled,
.home-content .download-qa-btn:disabled,
.home-content .progress-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(50%);
    box-shadow: none;
    transform: none;
    pointer-events: auto;
    background: var(--clr-white-shadow);
}

.version-info {
    display: block;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    font-size: 1.4rem;
    color: var(--clr-white-lowalpha);
    text-align: center;
    opacity: 0.8;
}

.version-info a#version-trigger-link {
    color: var(--clr-info);
    font-weight: var(--fw-semibold);
    text-decoration: none;
    cursor: pointer;
    transition: color var(--transition-fast), text-decoration var(--transition-fast);
}

.version-info a#version-trigger-link:hover {
    color: var(--clr-primary);
    text-decoration: underline;
}

/* Hide home section when other sections are active */
.container.quiz-active .home,
.container.learn-active .home {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
    transition: opacity var(--transition-normal) var(--transition-timing-smooth),
                transform var(--transition-normal) var(--transition-timing-smooth);
}

/* Ensure home section is visible by default */
.home {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
    transition: opacity var(--transition-normal) var(--transition-timing-smooth),
                transform var(--transition-normal) var(--transition-timing-smooth);
}

/* Learn Section (Flashcards) */
.learn-section {
    position: absolute;
    top: 0;
    left: 100%;
    width: 100%;
    height: 100vh;
    background: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: left var(--transition-slide) var(--transition-timing-smooth),
        opacity var(--transition-slide) var(--transition-timing-smooth);
    opacity: 0;
    pointer-events: none;
    z-index: var(--z-popup);
    padding: var(--spacing-md);
}

.learn-section.active {
    left: 0;
    opacity: 1;
    pointer-events: auto;
}

.flashcard-container {
    width: 50rem;
    max-width: 90%;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 60%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--clr-white-border);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-top: 3px solid var(--clr-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--clr-text-light);
}

.flashcard-container h2 {
    font-size: 2.8rem;
    margin-bottom: var(--spacing-lg);
    color: var(--clr-secondary);
    text-align: center;
}

.flashcard {
    background-color: transparent;
    width: 100%;
    height: 25rem;
    perspective: 1000px;
    margin-bottom: var(--spacing-lg);
    cursor: pointer;
    transition: transform var(--transition-fast) ease-out;
}

.flashcard:hover {
    transform: translateY(-5px);
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform var(--transition-flip);
    transform-style: preserve-3d;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: var(--fs-large);
}

.flashcard-front {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.15),
            rgba(255, 255, 255, 0.08));
    border: 1px solid var(--clr-white-border);
    color: var(--clr-text-light);
    align-items: center;
}

.flashcard-back {
    background: linear-gradient(135deg, var(--clr-secondary), var(--clr-secondary-darker));
    color: var(--clr-white);
    transform: rotateY(180deg);
    font-weight: var(--fw-bold);
    align-items: center;
}

.learn-question-text,
.learn-answer-text {
    margin: 0;
    line-height: 1.5;
}

.learn-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.learn-navigation button {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--clr-white-shadow);
    border: none;
    color: var(--clr-text-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--fs-base);
    min-width: 8rem;
    text-align: center;
    transition: background-color var(--transition-medium) var(--transition-timing-smooth),
        box-shadow var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-fast) ease-out,
        filter var(--transition-medium);
}

.learn-navigation button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    filter: none;
}

.card-counter {
    font-size: var(--fs-base);
    font-weight: var(--fw-medium);
    opacity: 0.8;
}

.card-jump-section {
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--clr-white-border);
    padding-top: var(--spacing-md);
}

.card-jump-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-sm);
}

.jump-title {
    font-size: var(--fs-small);
    color: var(--clr-text-light);
    opacity: 0.8;
    font-weight: var(--fw-medium);
    flex: 1;
}

.jump-toggle-btn {
    background: var(--clr-white-shadow);
    border: none;
    color: var(--clr-text-light);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all var(--transition-medium);
    min-width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.jump-toggle-btn:hover {
    background: var(--clr-white-border);
    transform: translateY(-1px);
}

.card-jump-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(3.5rem, 1fr));
    gap: var(--spacing-xs);
    max-height: 12rem;
    overflow-y: auto;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-sm);
    background: var(--clr-white-shadow);
    border-radius: var(--radius-md);
    border: 1px solid var(--clr-white-border);
    opacity: 0;
    max-height: 0;
    transition: all var(--transition-medium) var(--transition-timing-smooth);
    overflow: hidden;
    /* Firefox Scrollbar-Styling */
    scrollbar-width: thin;
    scrollbar-color: var(--clr-white-border) var(--clr-white-shadow);
}

.card-jump-grid.expanded {
    opacity: 1;
    max-height: 12rem;
    overflow-y: auto;
}

/* Moderner Scrollbar wie bei Patchnotes */
.card-jump-grid::-webkit-scrollbar {
    width: 8px;
}

.card-jump-grid::-webkit-scrollbar-track {
    background: transparent;
    margin-block: var(--spacing-sm);
}

.card-jump-grid::-webkit-scrollbar-thumb {
    background: var(--clr-white-lowalpha);
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

.card-jump-grid::-webkit-scrollbar-thumb:hover {
    background: var(--clr-white-border);
}

.card-jump-grid::-webkit-scrollbar-thumb:active {
    background: var(--clr-white-border);
}

.card-jump-grid::-webkit-scrollbar-corner {
    background: transparent;
}

/* Firefox Scrollbar Support */
.card-jump-grid {
    scrollbar-width: thin;
    scrollbar-color: var(--clr-white-lowalpha) transparent;
}

.card-number-btn {
    background: var(--clr-white-shadow);
    border: 1px solid var(--clr-white-border);
    color: var(--clr-text-light);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs);
    cursor: pointer;
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    min-height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
}

.card-number-btn:hover {
    background: var(--clr-primary);
    border-color: var(--clr-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--clr-black-shadow);
}

.card-number-btn.current {
    background: var(--clr-info);
    border-color: var(--clr-info);
    color: var(--clr-white);
    box-shadow: 0 0 10px rgba(42, 183, 202, 0.4);
}

.card-number-btn.current:hover {
    background: var(--clr-info-darker);
    border-color: var(--clr-info-darker);
}

.card-number-btn:active {
    transform: translateY(0);
}

.home-learn-btn {
    width: 19rem;
    height: 4.5rem;
    background: var(--clr-secondary);
    border: none;
    outline: none;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-secondary) 50%, black);
    font-size: var(--fs-base);
    color: var(--clr-white);
    font-weight: var(--fw-semibold);
    cursor: pointer;
    margin-top: var(--spacing-xl);
    transition: background-color var(--transition-medium) var(--transition-timing-smooth),
        box-shadow var(--transition-medium) var(--transition-timing-smooth),
        color var(--transition-medium),
        transform var(--transition-fast) ease-out,
        filter var(--transition-medium);
    display: inline-flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
}

.home-learn-btn:hover {
    background: var(--clr-secondary);
    color: var(--clr-white);
    filter: brightness(1.2);
    box-shadow: 0 8px 20px color-mix(in srgb, var(--clr-secondary) 40%, transparent);
}


/* Quiz Section */
.quiz-section {
    position: relative;
    left: -50%;
    width: 100%;
    height: 100vh;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 60%, transparent);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: left var(--transition-slide);
    z-index: var(--z-content);
    opacity: 0;
    pointer-events: none;
    padding: var(--spacing-md);
}

.quiz-section.active {
    left: 0;
    opacity: 1;
    pointer-events: auto;
    transition-delay: 0s;
}

.quiz-section .quiz-box {
    position: relative;
    width: 50rem;
    max-width: 90%;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 60%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--clr-white-border);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg) var(--spacing-xl) 0;
    max-height: 85vh;
    opacity: 0;
    pointer-events: none;
    transform: scale(.9);
    transition: opacity var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-medium) var(--transition-timing-smooth);
}

.quiz-box .quiz-scrollable-content {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-lg);
    scrollbar-width: none;
}

.quiz-box .quiz-scrollable-content::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}

.quiz-section .quiz-box.active {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
    transition: opacity 1s var(--transition-timing-smooth) 1s,
        transform 1s var(--transition-timing-smooth) 1s;
}

.quiz-box.active .quiz-header,
.quiz-box.active .question-text,
.quiz-box.active .option-list .option,
.quiz-box.active .quiz-footer {
    animation: fadeInUp 0.5s ease-out backwards;
}

.quiz-box.active .question-text {
    animation-delay: 0.1s;
}

.quiz-box.active .option-list .option:nth-child(1) {
    animation-delay: 0.2s;
}

.quiz-box.active .option-list .option:nth-child(2) {
    animation-delay: 0.3s;
}

.quiz-box.active .option-list .option:nth-child(3) {
    animation-delay: 0.4s;
}

.quiz-box.active .option-list .option:nth-child(4) {
    animation-delay: 0.5s;
}

.quiz-box.active .quiz-footer {
    animation-delay: 0.6s;
}

.quiz-box h1 {
    font-size: 3.2rem;
    text-align: center;
    background: linear-gradient(45deg, transparent, var(--clr-info), transparent);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) 0;
    margin: 0 auto var(--spacing-lg);
    width: fit-content;
    min-width: 60%;
}

.quiz-box .quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--clr-info);
    margin-bottom: var(--spacing-xl);
}

.quiz-header span {
    font-size: var(--fs-large);
    font-weight: var(--fw-medium);
}

.quiz-header .header-score {
    background: linear-gradient(135deg, var(--clr-info), var(--clr-info-darker));
    border-radius: 50px;
    padding: var(--spacing-xs) var(--spacing-md);
    color: var(--clr-white);
    font-weight: var(--fw-bold);
    font-size: var(--fs-small);
    box-shadow: 0 0 10px 2px color-mix(in srgb, var(--clr-info) 30%, transparent);
    white-space: nowrap;
}

.quiz-header .header-timer {
    background: linear-gradient(135deg, var(--clr-secondary), var(--clr-secondary-darker));
    border-radius: 50px;
    padding: var(--spacing-xs) var(--spacing-md);
    color: var(--clr-white);
    font-weight: var(--fw-bold);
    font-size: var(--fs-small);
    box-shadow: 0 0 10px 2px color-mix(in srgb, var(--clr-secondary) 30%, transparent);
    white-space: nowrap;
    margin-left: var(--spacing-sm);
}

.quiz-box .question-text {
    font-size: 2.2rem;
    font-weight: var(--fw-medium);
    margin-bottom: var(--spacing-lg);
    line-height: 1.4;
}

.option-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.option-list .option {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--clr-white-shadow);
    border: 1px solid var(--clr-white-border);
    border-radius: var(--radius-md);
    font-size: var(--fs-medium);
    margin: var(--spacing-sm) 0;
    cursor: pointer;
    color: var(--clr-text-light);
    transition: background-color var(--transition-fast) var(--transition-timing-smooth),
        border-color var(--transition-fast) var(--transition-timing-smooth),
        transform var(--transition-fast) ease-out,
        box-shadow var(--transition-fast) var(--transition-timing-smooth);
}

.option-list .option:hover {
    border-color: var(--clr-info);
    background-color: color-mix(in srgb, var(--clr-info) 15%, transparent);
    transform: scale(1.02);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.option-list .option.correct {
    background: color-mix(in srgb, var(--clr-success) 20%, var(--clr-bg-dark));
    color: var(--clr-white);
    border-color: var(--clr-success);
    font-weight: var(--fw-semibold);
}

.option-list .option.incorrect {
    background: color-mix(in srgb, var(--clr-error) 20%, var(--clr-bg-dark));
    color: var(--clr-white);
    border-color: var(--clr-error);
    font-weight: var(--fw-semibold);
}

.option-list .option.disabled {
    pointer-events: none;
}

.quiz-box .quiz-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--clr-info);
    padding-top: var(--spacing-lg);
    margin-top: 0;
    padding-bottom: var(--spacing-lg);
}

.quiz-footer .question-total {
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
}

.quiz-footer .next-btn {
    width: 10rem;
    height: 4.5rem;
    background: var(--clr-white-shadow);
    border: none;
    outline: none;
    color: var(--clr-white-lowalpha);
    border-radius: var(--radius-md);
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    cursor: pointer;
    pointer-events: none;
    transition: background-color var(--transition-medium) var(--transition-timing-smooth),
        color var(--transition-medium),
        box-shadow var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-fast) ease-out,
        filter var(--transition-medium);
}

.quiz-footer .next-btn.active {
    pointer-events: auto;
    background: var(--clr-info);
    border-color: var(--clr-info);
    color: var(--clr-white);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-info) 50%, black);
}

/* Result Box (Quiz End) */
.quiz-section .result-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(.9);
    width: 50rem;
    max-width: 90%;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 60%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--clr-white-border);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-medium) var(--transition-timing-smooth), transform var(--transition-medium) var(--transition-timing-smooth);
    z-index: calc(var(--z-content) + 1);
}

.quiz-section .result-box.active {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.result-box h2 {
    font-size: 4.5rem;
    font-weight: var(--fw-bold);
    margin-bottom: var(--spacing-md);
    color: var(--clr-text-light);
    text-align: center;
}

.result-box .percentage-container {
    width: 100%;
    max-width: 30rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: var(--spacing-lg) 0 var(--spacing-xl);
}

.percentage-container .circular-progress {
    position: relative;
    width: 22rem;
    height: 22rem;
    background: conic-gradient(var(--clr-info) 0deg, var(--clr-white-shadow) 0deg);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.2),
        0 0 15px 5px color-mix(in srgb, var(--clr-info) 15%, transparent);
}

.percentage-container .circular-progress::before {
    content: '';
    position: absolute;
    width: 18.5rem;
    height: 18.5rem;
    background-color: var(--clr-bg-dark);
    border-radius: 50%;
}

.circular-progress .progress-value {
    position: relative;
    font-size: 4rem;
    font-weight: var(--fw-bold);
    color: var(--clr-info);
}

.percentage-container .score-text {
    font-size: 2.2rem;
    font-weight: var(--fw-semibold);
    margin-top: var(--spacing-lg);
    opacity: 0.9;
}

.result-box .buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    width: 100%;
    border-top: 1px solid var(--clr-white-border);
    flex-wrap: wrap;
    justify-content: center;
}

.result-box .buttons button {
    width: 80%;
    max-width: 30rem;
    min-width: 12rem;
    height: 4.7rem;
    padding: 0 var(--spacing-lg);
    border: none;
    outline: none;
    border-radius: var(--radius-md);
    font-size: var(--fs-base);
    color: var(--clr-white);
    font-weight: var(--fw-semibold);
    cursor: pointer;
    box-shadow: 0 4px 10px -2px rgba(0, 0, 0, 0.3);
    transition: background-color var(--transition-medium) var(--transition-timing-smooth),
        color var(--transition-medium) var(--transition-timing-smooth),
        border-color var(--transition-medium) var(--transition-timing-smooth),
        box-shadow var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-fast) ease-out,
        filter var(--transition-medium);
}

.result-box .buttons .review-btn {
    background-color: var(--clr-bg-medium);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-bg-medium) 50%, black);
    order: 1;
}

.result-box .buttons .try-again-btn {
    background-color: var(--clr-success);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-success) 50%, black);
    order: 2;
}

.result-box .buttons .home-btn {
    background-color: var(--clr-secondary);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-secondary) 50%, black);
    order: 3;
}

.result-box .buttons button:hover {
    transform: scale(1.03) translateY(-2px);
    filter: brightness(1.15);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

/* Review Section */
.review-section {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    z-index: var(--z-modal);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-medium) var(--transition-timing-smooth);
    overflow-y: auto;
}

.review-section.active {
    opacity: 1;
    pointer-events: auto;
}

.review-section .review-box {
    width: 60rem;
    max-width: 95%;
    max-height: 90vh;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 80%, transparent);
    border: 1px solid var(--clr-white-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--clr-text-light);
    overflow: hidden;
}

.review-box h2 {
    font-size: var(--fs-h2);
    color: var(--clr-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.review-box .review-content {
    width: 100%;
    max-height: 65vh;
    overflow-y: auto;
    padding-right: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.review-item {
    background: var(--clr-white-shadow);
    border: 1px solid var(--clr-white-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.review-item .review-question-text {
    font-size: var(--fs-medium);
    font-weight: var(--fw-semibold);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--clr-white-lowalpha);
    padding-bottom: var(--spacing-sm);
}

.review-item .review-options {
    list-style: none;
    padding: 0;
    margin: 0;
}

.review-item .review-option {
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-xs) 0;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-size: var(--fs-base);
    opacity: 0.8;
    transition: background-color 0.2s, border-color 0.2s, opacity 0.2s;
}

.review-item .review-option.correct {
    border-color: var(--clr-success);
    background-color: color-mix(in srgb, var(--clr-success) 15%, transparent);
    color: var(--clr-white);
    font-weight: var(--fw-medium);
    opacity: 1;
}

.review-item .review-option.incorrect-user {
    border-color: var(--clr-error);
    background-color: color-mix(in srgb, var(--clr-error) 15%, transparent);
    color: var(--clr-white);
    text-decoration: line-through;
    opacity: 1;
}

.review-item .review-option.correct.incorrect-user {
    text-decoration: none;
}

.review-box .review-close-btn {
    width: auto;
    min-width: 12rem;
    height: 4.7rem;
    padding: 0 var(--spacing-lg);
    border: 1px solid var(--clr-secondary);
    outline: none;
    border-radius: var(--radius-md);
    font-size: var(--fs-base);
    color: var(--clr-secondary);
    background-color: transparent;
    font-weight: var(--fw-semibold);
    cursor: pointer;
    margin-top: var(--spacing-md);
    transition: all var(--transition-fast);
}

.review-box .review-close-btn:hover {
    background-color: color-mix(in srgb, var(--clr-secondary) 15%, transparent);
    color: var(--clr-white);
    transform: scale(1.03) translateY(-2px);
    box-shadow: 0 8px 20px color-mix(in srgb, var(--clr-secondary) 40%, transparent);
    filter: brightness(1.1);
}

/* Progress Section */
.progress-section {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    z-index: var(--z-modal);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-medium) var(--transition-timing-smooth);
    overflow-y: auto;
}

.progress-section.active {
    opacity: 1;
    pointer-events: auto;
}

.progress-section .progress-box {
    width: 70rem;
    max-width: 95%;
    max-height: 90vh;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 80%, transparent);
    border: 1px solid var(--clr-white-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    color: var(--clr-text-light);
    overflow: hidden;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--clr-white-border);
}

.progress-header h2 {
    font-size: 1.8rem;
    color: var(--clr-white);
    margin: 0;
    font-weight: var(--fw-semibold);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.5px;
}

.progress-close-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--clr-text-light);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    opacity: 0.8;
    transition: all var(--transition-fast);
    width: 3.2rem;
    height: 3.2rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.progress-close-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(360deg);
}

.progress-content {
    flex: 1;
    overflow-y: auto;
    padding-right: var(--spacing-sm);
}

.progress-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--clr-white-border);
    padding-bottom: var(--spacing-sm);
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: var(--fw-medium);
    color: var(--clr-text-muted);
    transition: all var(--transition-fast);
    font-size: var(--fs-base);
}

.tab-btn:hover {
    color: var(--clr-text-light);
    background: var(--clr-white-shadow);
}

.tab-btn.active {
    background: var(--clr-secondary);
    color: var(--clr-white);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Overview Stats */
.overview-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--clr-white-shadow);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
    border: 1px solid var(--clr-white-border);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.stat-icon {
    font-size: 2rem;
    width: 4rem;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--clr-secondary);
    border-radius: 50%;
    color: var(--clr-white);
    flex-shrink: 0;
}

.stat-info h3 {
    margin: 0 0 var(--spacing-xs) 0;
    font-size: var(--fs-small);
    color: var(--clr-text-muted);
    font-weight: var(--fw-medium);
}

.stat-value {
    margin: 0;
    font-size: var(--fs-h3);
    font-weight: var(--fw-bold);
    color: var(--clr-text-light);
}

/* Modules Progress */
.modules-progress {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.module-progress-card {
    background: var(--clr-white-shadow);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--clr-secondary);
    border: 1px solid var(--clr-white-border);
}

.module-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.module-name {
    font-weight: var(--fw-semibold);
    color: var(--clr-text-light);
    font-size: var(--fs-medium);
}

.module-stats {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--fs-small);
    color: var(--clr-text-muted);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--clr-white-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--clr-secondary), var(--clr-success));
    border-radius: var(--radius-sm);
    transition: width var(--transition-medium);
}

/* Achievements Grid */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.achievement-card {
    background: var(--clr-white-shadow);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.achievement-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.achievement-card.unlocked {
    border-color: var(--clr-success);
    background: linear-gradient(135deg, var(--clr-white-shadow), color-mix(in srgb, var(--clr-success) 10%, transparent));
}

.achievement-card.locked {
    opacity: 0.6;
    filter: grayscale(1);
}

.achievement-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.achievement-title {
    font-weight: var(--fw-semibold);
    margin-bottom: var(--spacing-xs);
    color: var(--clr-text-light);
    font-size: var(--fs-medium);
}

.achievement-description {
    font-size: var(--fs-small);
    color: var(--clr-text-muted);
    line-height: 1.4;
}

/* Statistics Details */
.statistics-details {
    background: var(--clr-white-shadow);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--clr-white-border);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--clr-white-border);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-row span:first-child {
    color: var(--clr-text-muted);
    font-weight: var(--fw-medium);
}

.stat-row span:last-child {
    color: var(--clr-text-light);
    font-weight: var(--fw-semibold);
}

/* Responsive Design for Progress */
@media (max-width: 768px) {
    .progress-section .progress-box {
        padding: var(--spacing-md);
        width: 98%;
    }
    
    .progress-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1;
        min-width: 120px;
    }
    
    .overview-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
    
    .stat-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.5rem;
    }
    
    .module-progress-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .module-stats {
        flex-wrap: wrap;
    }
}

/* Learning Statistics */
.learning-statistics {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.learning-section {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: var(--spacing-lg);
}

.learning-section h3 {
    color: var(--clr-white);
    font-size: 1.4rem;
    margin-bottom: var(--spacing-md);
    font-weight: var(--fw-semibold);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.time-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.time-stat-card {
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.time-label {
    color: var(--clr-text-muted);
    font-weight: var(--fw-medium);
    font-size: 0.9rem;
}

.time-value {
    color: var(--clr-white);
    font-weight: var(--fw-semibold);
    font-size: 1.1rem;
}

.weakness-analysis,
.learning-recommendations {
    color: var(--clr-text-light);
    line-height: 1.6;
}

.weakness-analysis h4,
.learning-recommendations h4 {
    color: var(--clr-white);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--fw-semibold);
}

.weakness-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    border-left: 3px solid var(--clr-secondary);
}

.weakness-item strong {
    color: var(--clr-white);
    font-weight: var(--fw-semibold);
}

.recommendation-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    border-left: 3px solid var(--clr-info);
}

.recommendation-item strong {
    color: var(--clr-white);
    font-weight: var(--fw-semibold);
}

.no-data {
    color: var(--clr-text-muted);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-lg);
}

/* Learning Statistics Responsive */
@media (max-width: 768px) {
    .time-stats {
        grid-template-columns: 1fr;
    }
    
    .time-stat-card {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-xs);
    }
    
    .learning-section {
        padding: var(--spacing-md);
    }
}


/* Popups & Modals (Info Popup, Patchnotes) */
.popup-info {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1) translateY(-20px);
    width: 50rem;
    max-width: 90%;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 70%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: none;
    border-top: 3px solid var(--clr-info);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-medium) var(--transition-timing-smooth);
    z-index: var(--z-modal);
    color: var(--clr-text-light);
}

.popup-info.active {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1) translateY(0);
}

.popup-info h2 {
    font-size: var(--fs-h2);
    color: var(--clr-info);
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-weight: var(--fw-semibold);
}

.popup-info .info {
    display: block;
    font-size: var(--fs-base);
    color: var(--clr-text-light);
    font-weight: var(--fw-normal);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
    text-align: center;
}

.popup-info .info ol {
    counter-reset: rule-counter;
    list-style: none;
    padding-left: 0;
    margin-top: var(--spacing-sm);
}

.popup-info .info li {
    counter-increment: rule-counter;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-left: 3.5rem;
    text-align: left;
    line-height: 1.5;
}

.popup-info .info li::before {
    content: counter(rule-counter);
    position: absolute;
    left: 0;
    top: -0.1em;
    font-weight: var(--fw-bold);
    color: var(--clr-info);
    background-color: color-mix(in srgb, var(--clr-info) 15%, transparent);
    border-radius: 50%;
    width: 2.4rem;
    height: 2.4rem;
    text-align: center;
    line-height: 2.4rem;
    font-size: 1.4rem;
}

.popup-info .btn-group {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    align-items: center;
    margin-top: var(--spacing-xl);
    padding-top: 0;
}

.popup-info .btn-group .info-btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    height: 4.5rem;
    width: auto;
    min-width: 10rem;
    padding: 0 var(--spacing-md);
    border: none;
    outline: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-decoration: none;
    background: var(--clr-info);
    color: var(--clr-white);
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    box-shadow: 0 4px 10px -2px color-mix(in srgb, var(--clr-info) 50%, black);
    transition: background-color var(--transition-medium) var(--transition-timing-smooth),
        color var(--transition-medium) var(--transition-timing-smooth),
        border-color var(--transition-medium) var(--transition-timing-smooth),
        box-shadow var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-fast) ease-out,
        filter var(--transition-medium);
}

.popup-info .btn-group .info-btn:nth-child(1) {
    background: transparent;
    color: var(--clr-info);
    border: 1px solid var(--clr-info);
    order: 1;
}

.popup-info .btn-group .info-btn:nth-child(1):hover {
    background: color-mix(in srgb, var(--clr-info) 10%, transparent);
    color: var(--clr-info);
    filter: brightness(1);
}

.popup-info .btn-group .info-btn:nth-child(2) {
    order: 2;
    background: var(--clr-info);
    color: var(--clr-white);
}

.patchnotes-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    z-index: var(--z-modal);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-medium) var(--transition-timing-smooth),
        transform var(--transition-medium) var(--transition-timing-smooth);
    transform: scale(0.95);
}

.patchnotes-modal.active {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}

.patchnotes-box {
    position: relative;
    width: 65rem;
    max-width: 95%;
    max-height: 85vh;
    background-color: color-mix(in srgb, var(--clr-bg-dark) 90%, transparent);
    border: 1px solid var(--clr-white-border);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-xxl);
    display: flex;
    flex-direction: column;
    color: var(--clr-text-light);
    overflow: hidden;
}

.patchnotes-box h2 {
    font-size: clamp(2.6rem, 5vw, 3.2rem);
    color: var(--clr-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    flex-shrink: 0;
    font-weight: var(--fw-semibold);
    border-bottom: 1px solid var(--clr-white-lowalpha);
    padding-bottom: var(--spacing-md);
}

.patchnotes-box .close-btn {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--clr-text-light);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    opacity: 0.8;
    transition: all var(--transition-fast);
    width: 3.2rem;
    height: 3.2rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.patchnotes-box .close-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(360deg);
}

.patchnotes-content {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: var(--spacing-md);
    min-height: 0;

    &::-webkit-scrollbar {
        width: 8px;
    }

    &::-webkit-scrollbar-track {
        background: transparent;
        margin-block: var(--spacing-sm);
    }

    &::-webkit-scrollbar-thumb {
        background: var(--clr-white-lowalpha);
        border-radius: 4px;
        border: 2px solid transparent;
        background-clip: padding-box;
    }

    &::-webkit-scrollbar-thumb:hover {
        background: var(--clr-white-border);
    }

    scrollbar-width: thin;
    scrollbar-color: var(--clr-white-lowalpha) transparent;
}

.version-group {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--clr-white-border);
}

.version-group:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.patchnotes-content h3 {
    color: var(--clr-text-light);
    font-weight: var(--fw-bold);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--clr-white-lowalpha);
    padding-bottom: var(--spacing-sm);
    font-size: unset;
}

.patchnotes-content h3 {
    color: var(--clr-text-light);
    font-weight: var(--fw-semibold);
    margin-top: 0;
    margin-bottom: var(--spacing-lg);
    border-bottom: none;
    padding-bottom: 0;
    font-size: 1.8rem;
}

.patchnotes-content h3:first-child {
    margin-top: 0;
}

.version-date {
    font-size: 1.4rem;
    color: var(--clr-white-lowalpha);
    font-weight: var(--fw-normal);
    margin-left: var(--spacing-sm);
}

.patchnotes-content ul {
    list-style: disc;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.patchnotes-content li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.5;
}

.patchnotes-content ul.patch-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
}

.patchnotes-content ul.patch-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    font-size: var(--fs-base);
}

.patchnotes-content ul.patch-list li .tag {
    min-width: 10rem;
    flex-shrink: 0;
    justify-content: center;
}

.patchnotes-content ul.patch-list li:last-child {
    margin-bottom: 0;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.8rem;
    font-size: 1.1rem;
    font-weight: var(--fw-semibold);
    border-radius: 0.5rem;
    color: var(--clr-white);
    line-height: 1.2;
    white-space: nowrap;
    text-align: center;
    margin-top: 0.1em;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    justify-content: space-between;
}

.tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.tag-new {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.3);
}

.tag-new::after {
    content: '✨';
    font-size: 1.2em;
}

.tag-fix {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.tag-fix::after {
    content: '🔧';
    font-size: 1.2em;
}

.tag-improvement {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.tag-improvement::after {
    content: '⚡';
    font-size: 1.2em;
}

.tag-info {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.tag-info::after {
    content: '💡';
    font-size: 1.2em;
}

/* Utility Styles */
.error-message {
    color: var(--clr-error);
    font-size: var(--fs-medium);
    text-align: center;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: color-mix(in srgb, var(--clr-error) 20%, transparent);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

/* Animations & Keyframes */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes meteor {
    0% {
        opacity: 0;
        transform: translate(-10vw, -10vh) scale(0.5);
    }

    10% {
        opacity: 0.8;
        transform: translate(0, 0) scale(1);
    }

    90% {
        opacity: 0.8;
    }

    100% {
        opacity: 0;
        transform: translate(110vw, 110vh) scale(0.5);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* Media Queries (Responsive Design) */
@media (max-width: 768px) {
    html {
        font-size: 60%;
    }

    .header {
        padding: var(--spacing-md) 5%;
    }

    .navbar {
        display: none;
    }

    .logo {
        font-size: 2.8rem;
    }

    .home-content h1 {
        font-size: clamp(3.5rem, 10vw, 5rem);
    }

    .home-content p {
        font-size: var(--fs-small);
        max-width: 100%;
    }

    .module-selector select {
        width: 90%;
        max-width: 30rem;
    }

    .button-container {
        width: 100%;
        align-items: center;
    }

    .home-content .btn {
        width: 80%;
        max-width: 25rem;
        height: 5rem;
        font-size: var(--fs-medium);
    }

    .version-info {
        margin-bottom: var(--spacing-xxl);
    }

    /* Donation section mobile styling */
    .donation-section {
        margin-top: var(--spacing-md);
        gap: var(--spacing-xs);
    }

    .donation-btn {
        font-size: 1.2rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .donation-text {
        font-size: 1.1rem;
        max-width: 220px;
    }

    .popup-info,
    .flashcard-container,
    .quiz-section .quiz-box,
    .quiz-section .result-box,
    .review-section .review-box,
    .pdf-preview-section .pdf-preview-box,
    .patchnotes-box {
        width: 90%;
        max-width: 95%;
        padding: var(--spacing-lg);
    }

    .popup-info h2,
    .flashcard-container h2,
    .review-box h2,
    .pdf-preview-header h2,
    .patchnotes-box h2 {
        font-size: clamp(2.4rem, 6vw, 3.5rem);
    }

    .popup-info .btn-group {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .popup-info .btn-group .info-btn {
        width: 100%;
    }

    .quiz-box h1 {
        font-size: 2.8rem;
        min-width: 80%;
        padding: var(--spacing-xs) 0;
    }

    .quiz-header {
        padding: var(--spacing-sm) 0;
        margin-bottom: var(--spacing-lg);
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .quiz-header span {
        font-size: var(--fs-medium);
    }

    .quiz-box .question-text {
        font-size: 1.9rem;
    }

    .option-list .option {
        font-size: var(--fs-small);
        padding: var(--spacing-sm);
    }

    .quiz-footer {
        padding-top: var(--spacing-md);
        padding-bottom: var(--spacing-md);
    }

    .quiz-footer .next-btn {
        width: 8rem;
        height: 4rem;
        font-size: var(--fs-small);
    }

    .result-box h2 {
        font-size: 3.5rem;
    }

    .percentage-container .circular-progress {
        width: 18rem;
        height: 18rem;
    }

    .percentage-container .circular-progress::before {
        width: 15rem;
        height: 15rem;
    }

    .circular-progress .progress-value {
        font-size: 3rem;
    }

    .percentage-container .score-text {
        font-size: 1.8rem;
    }

    .result-box .buttons {
        width: 100%;
    }

    .result-box .buttons button {
        width: 90%;
        max-width: none;
        height: 4.5rem;
        font-size: var(--fs-base);
    }

    .flashcard {
        height: 20rem;
    }

    .flashcard-front,
    .flashcard-back {
        font-size: var(--fs-medium);
        padding: var(--spacing-lg);
    }

    .learn-navigation button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--fs-small);
        min-width: 6rem;
    }

    .card-jump-section {
        margin-top: var(--spacing-md);
    }

    .card-jump-grid {
        grid-template-columns: repeat(auto-fill, minmax(3rem, 1fr));
        max-height: 10rem;
    }

    .card-number-btn {
        min-height: 2.5rem;
        font-size: var(--fs-small);
    }

    .jump-title {
        font-size: var(--fs-small);
    }

    .home-learn-btn {
        width: 80%;
        max-width: 25rem;
        height: 4.5rem;
        font-size: var(--fs-base);
    }

    .review-box .review-content {
        max-height: 60vh;
    }

    .review-item .review-question-text {
        font-size: var(--fs-base);
    }

    .review-item .review-option {
        font-size: var(--fs-small);
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .review-box .review-close-btn {
        width: 80%;
        max-width: 25rem;
        height: 4.5rem;
    }

    .tag {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 55%;
    }

    .quiz-header .header-timer {
        margin-left: 0;
    }

    .percentage-container .circular-progress {
        width: 15rem;
        height: 15rem;
    }

    .percentage-container .circular-progress::before {
        width: 12.5rem;
        height: 12.5rem;
    }

    .circular-progress .progress-value {
        font-size: 2.5rem;
    }

}

/* Quiz Loading Animation */
.option-list.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.option-list.loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid var(--clr-white-border);
    border-top-color: var(--clr-info);
    border-radius: 50%;
    animation: quiz-loading-spin 1s linear infinite;
    z-index: 10;
    background: var(--clr-bg-dark);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.option-list.loading .option {
    pointer-events: none;
    opacity: 0.4;
    transform: none !important;
}

@keyframes quiz-loading-spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.question-text.loading {
    opacity: 0.6;
}

.option-list .option.disabled {
    pointer-events: none;
}

/* Donation Section Styling */
.donation-section {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.donation-section:hover {
    opacity: 1;
}

.donation-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    color: var(--clr-text-light);
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: var(--fw-medium);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    transition: all var(--transition-medium);
    box-shadow: 
        0 2px 10px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.donation-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
}

.donation-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
    box-shadow: 
        0 4px 15px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.donation-btn:hover::before {
    left: 100%;
}

.donation-btn:active {
    transform: translateY(0);
    background: rgba(255, 255, 255, 0.08);
}

.paypal-icon {
    width: 16px;
    height: 16px;
    color: #ffc439;
    filter: drop-shadow(0 0 2px rgba(255, 196, 57, 0.3));
}

.donation-text {
    margin: 0;
    font-size: 1.2rem;
    color: var(--clr-white-lowalpha);
    font-style: italic;
    text-align: center;
    max-width: 250px;
    line-height: 1.3;
}

/* ===== ANIMATIONS ===== */

/* Smooth transitions for all interactive elements */
.quiz-box,
.result-box,
.flashcard-container,
.review-box,
.popup-info,
.patchnotes-modal {
    transition: all var(--transition-medium) var(--smooth);
}

/* Button Hover Animationen */
.btn,
.start-btn,
.learn-btn,
.download-qa-btn,
.next-btn,
.try-again-btn,
.home-btn,
.review-btn,
.prev-card-btn,
.next-card-btn,
.home-learn-btn,
.review-close-btn,
.info-btn,
.close-btn {
    transition: all var(--transition-medium) var(--smooth);
    position: relative;
    overflow: hidden;
}

.btn:hover,
.start-btn:hover,
.learn-btn:hover,
.download-qa-btn:hover,
.next-btn:hover,
.try-again-btn:hover,
.home-btn:hover,
.review-btn:hover,
.prev-card-btn:hover,
.next-card-btn:hover,
.home-learn-btn:hover,
.review-close-btn:hover,
.info-btn:hover,
.close-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.btn:active,
.start-btn:active,
.learn-btn:active,
.download-qa-btn:active,
.next-btn:active,
.try-again-btn:active,
.home-btn:active,
.review-btn:active,
.prev-card-btn:active,
.next-card-btn:active,
.home-learn-btn:active,
.review-close-btn:active,
.info-btn:active,
.close-btn:active {
    transform: translateY(0);
    transition: all 0.1s ease;
}

/* Progress button should not turn gray when clicked */
.progress-btn:active {
    transform: scale(0.98);
    transition: all 0.1s ease;
}

/* Option Hover Animationen */
.option {
    transition: all var(--transition-medium) var(--smooth);
    transform: translateZ(0);
}

.option:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.option:active {
    transform: translateY(-1px) scale(1.01);
}

/* Quiz Box Slide Animation */
.quiz-box {
    animation: slideInUp 0.6s var(--elastic);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Result Box Bounce Animation */
.result-box {
    animation: bounceIn 0.8s var(--bounce);
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Flashcard Flip Animation - handled by the original rule above */

/* Circular Progress Animation */
.circular-progress {
    animation: progressPulse 2s ease-in-out infinite;
}

@keyframes progressPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Module Selector Animation */
.module-selector select {
    transition: all var(--transition-medium) var(--smooth);
}

.module-selector select:focus {
    transform: scale(1.02);
    box-shadow: 0 0 0 3px rgba(30, 144, 255, 0.3);
}

/* Loading animation for quiz */
.quiz-box.loading {
    animation: loadingShimmer 1.5s ease-in-out infinite;
}

@keyframes loadingShimmer {
    0% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0.7;
    }
}

/* Success animation for correct answers */
.option.correct {
    animation: correctAnswer 0.6s var(--bounce);
}

@keyframes correctAnswer {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

/* Error animation for incorrect answers */
.option.incorrect {
    animation: incorrectAnswer 0.6s ease;
}

@keyframes incorrectAnswer {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

/* Fade in animation for new questions */
.question-text {
    animation: fadeIn 0.5s var(--smooth);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Pulse animation for important elements */
.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(30, 144, 255, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(30, 144, 255, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(30, 144, 255, 0);
    }
}

/* Floating animation for stars */
.stars-background {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Scale animation for buttons when clicking */
.btn-scale {
    animation: buttonScale 0.2s ease;
}

@keyframes buttonScale {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.95);
    }
    100% {
        transform: scale(1);
    }
}

/* Slide animation for navigation */
.section-transition {
    animation: slideTransition 0.4s var(--smooth);
}

@keyframes slideTransition {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Achievement Notification Animations */
@keyframes achievementSlideIn {
    0% {
        opacity: 0;
        transform: translateX(100%) scale(0.8) rotate(5deg);
    }
    50% {
        transform: translateX(-10px) scale(1.05) rotate(-2deg);
    }
    100% {
        opacity: 1;
        transform: translateX(0) scale(1) rotate(0deg);
    }
}

@keyframes achievementSlideOut {
    0% {
        opacity: 1;
        transform: translateX(0) scale(1) rotate(0deg);
    }
    100% {
        opacity: 0;
        transform: translateX(100%) scale(0.8) rotate(5deg);
    }
}

@keyframes achievementPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

/* Glow effect for active elements */
.glow {
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        box-shadow: 0 0 5px rgba(30, 144, 255, 0.5);
    }
    to {
        box-shadow: 0 0 20px rgba(30, 144, 255, 0.8);
    }
}

/* Progress Section Responsive */
@media (max-width: 768px) {
    .progress-box {
        width: 95%;
        max-height: 90vh;
        margin: 2rem auto;
    }
    
    .progress-tabs {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .tab-btn {
        font-size: 0.8rem;
        padding: 0.5rem 0.8rem;
    }
    
    .overview-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== DEBUG MENU ===== */

.debug-section {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-smooth);
}

.debug-section.active {
    opacity: 1;
    visibility: visible;
}

.debug-box {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    animation: slideInUp 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.debug-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.debug-header h2 {
    font-size: 1.8rem;
    color: var(--clr-white);
    margin: 0;
    font-weight: var(--fw-semibold);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.5px;
}

.debug-close-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--clr-text-light);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    opacity: 0.8;
    transition: all var(--transition-fast);
    width: 3.2rem;
    height: 3.2rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.debug-close-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(360deg);
}

.debug-content {
    color: var(--clr-text-light);
}

.debug-tools {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.debug-tool-group {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.debug-tool-group h3 {
    color: var(--clr-white);
    font-size: 1.2rem;
    margin: 0 0 1rem 0;
    font-weight: var(--fw-semibold);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.debug-btn {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.8rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: var(--fw-medium);
    transition: all var(--transition-fast);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.debug-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.debug-btn:active {
    transform: translateY(0);
}

.debug-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.debug-btn:hover::before {
    left: 100%;
}

/* Debug Trigger Button - Hidden */
.debug-trigger {
    display: none !important;
}

/* Debug Menu Responsive */
@media (max-width: 768px) {
    .debug-box {
        width: 95%;
        padding: 1.5rem;
        max-height: 95vh;
    }
    
    .debug-tools {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .debug-tool-group {
        padding: 1rem;
    }
    
    .debug-header h2 {
        font-size: 1.5rem;
    }
    
    .debug-btn {
        font-size: 0.85rem;
        padding: 0.7rem 0.8rem;
    }
}

/* Quiz Mode Modal */
.quiz-mode-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-smooth);
}

.quiz-mode-modal.active {
    opacity: 1;
    visibility: visible;
}

.quiz-mode-box {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    animation: slideInUp 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.quiz-mode-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.quiz-mode-header h2 {
    font-size: 1.8rem;
    color: var(--clr-white);
    margin: 0;
    font-weight: var(--fw-semibold);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.5px;
}

.quiz-mode-close-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--clr-text-light);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    opacity: 0.8;
    transition: all var(--transition-fast);
    width: 3.2rem;
    height: 3.2rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.quiz-mode-close-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(360deg);
}

.quiz-mode-content {
    color: var(--clr-text-light);
}

.quiz-mode-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.quiz-mode-option {
    position: relative;
}

.quiz-mode-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.quiz-mode-option label {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-mode-option input[type="radio"]:checked + label {
    background: rgba(30, 144, 255, 0.2);
    border-color: var(--clr-primary);
    box-shadow: 0 0 20px rgba(30, 144, 255, 0.3);
}

.quiz-mode-option label:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.mode-icon {
    font-size: 2rem;
    width: 4rem;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    flex-shrink: 0;
}

.mode-info h3 {
    font-size: 1.4rem;
    font-weight: var(--fw-semibold);
    margin: 0 0 0.5rem 0;
    color: var(--clr-white);
}

.mode-info p {
    font-size: 1.2rem;
    margin: 0;
    opacity: 0.8;
}

.quiz-mode-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.quiz-mode-cancel-btn,
.quiz-mode-continue-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1.4rem;
    font-weight: var(--fw-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-mode-cancel-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--clr-text-light);
}

.quiz-mode-cancel-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.quiz-mode-continue-btn {
    background: var(--clr-primary);
    color: var(--clr-white);
}

.quiz-mode-continue-btn:hover {
    background: #0066cc;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 144, 255, 0.4);
}

/* Responsive adjustments for quiz mode modal */
@media (max-width: 768px) {
    .quiz-mode-box {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .quiz-mode-options {
        gap: 0.8rem;
    }
    
    .quiz-mode-option label {
        padding: 1.2rem;
    }
    
    .mode-icon {
        width: 3.5rem;
        height: 3.5rem;
        font-size: 1.8rem;
    }
    
    .mode-info h3 {
        font-size: 1.3rem;
    }
    
    .mode-info p {
        font-size: 1.1rem;
    }
    
    .quiz-mode-actions {
        flex-direction: column;
    }
    
    .quiz-mode-cancel-btn,
    .quiz-mode-continue-btn {
        width: 100%;
        padding: 1.2rem;
    }
}