/* ==========================================
   QUIZMO - Modern Quiz Application Styles
   Glassmorphism + Gradient Theme
   ========================================== */

/* CSS Variables */
:root {
    /* Light Theme */
    --bg-primary: #f0f4ff;
    --bg-secondary: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a0;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: rgba(31, 38, 135, 0.15);
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --gradient-accent: #f093fb;
    --success: #10b981;
    --success-light: rgba(16, 185, 129, 0.15);
    --error: #ef4444;
    --error-light: rgba(239, 68, 68, 0.15);
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.15);
    --info: #3b82f6;
    --info-light: rgba(59, 130, 246, 0.15);
    --input-bg: rgba(255, 255, 255, 0.5);
    --input-border: rgba(0, 0, 0, 0.1);
    --code-bg: rgba(102, 126, 234, 0.1);
    --orb-1: rgba(102, 126, 234, 0.4);
    --orb-2: rgba(118, 75, 162, 0.3);
    --orb-3: rgba(240, 147, 251, 0.3);
}

[data-theme="dark"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --text-primary: #f0f0f5;
    --text-secondary: #b0b0c0;
    --text-muted: #6a6a80;
    --glass-bg: rgba(30, 30, 50, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(0, 0, 0, 0.3);
    --input-bg: rgba(0, 0, 0, 0.3);
    --input-border: rgba(255, 255, 255, 0.1);
    --code-bg: rgba(102, 126, 234, 0.2);
    --orb-1: rgba(102, 126, 234, 0.3);
    --orb-2: rgba(118, 75, 162, 0.25);
    --orb-3: rgba(240, 147, 251, 0.2);
}

/* Base Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--input-bg);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--gradient-end), var(--gradient-accent));
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-corner {
    background: var(--input-bg);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--gradient-start) var(--input-bg);
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.8;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--orb-1);
    top: -200px;
    left: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--orb-2);
    top: 50%;
    right: -150px;
    animation-delay: -5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--orb-3);
    bottom: -100px;
    left: 30%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(50px, 50px) rotate(5deg); }
    50% { transform: translate(0, 100px) rotate(0deg); }
    75% { transform: translate(-50px, 50px) rotate(-5deg); }
}

/* Confetti Container */
#confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    opacity: 0;
    animation: confetti-fall 3s ease-out forwards;
}

@keyframes confetti-fall {
    0% {
        opacity: 1;
        transform: translateY(-100px) rotate(0deg);
    }
    100% {
        opacity: 0;
        transform: translateY(100vh) rotate(720deg);
    }
}

/* Theme Toggle */
.theme-toggle-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.theme-btn {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--glass-shadow);
}

.theme-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px var(--glass-shadow);
}

.theme-icon {
    width: 22px;
    height: 22px;
    color: var(--text-primary);
    display: none;
}

/* Theme icon visibility */
[data-theme="light"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: block; }
[data-theme="system"] .system-icon { display: block; }

.theme-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    box-shadow: 0 10px 40px var(--glass-shadow);
    min-width: 150px;
}

.theme-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.2s ease;
    font-size: 14px;
    font-weight: 500;
}

/* Light theme dropdown text colors */
body.theme-light .theme-option {
    color: #1a1a2e;
}

body.theme-light .theme-option:hover {
    background: rgba(0, 0, 0, 0.05);
    color: #1a1a2e;
}

body.theme-light .theme-option.active {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

/* Dark theme dropdown text colors */
body.theme-dark .theme-option {
    color: #f0f0f5;
}

body.theme-dark .theme-option:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #f0f0f5;
}

body.theme-dark .theme-option.active {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.theme-option svg {
    width: 18px;
    height: 18px;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Screen Management */
.screen {
    display: none;
    width: 100%;
    animation: fadeIn 0.4s ease;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Glass Card */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 50px var(--glass-shadow);
    transition: all 0.3s ease;
}

/* Logo */
.logo-container {
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
}

.logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    display: block;
}

/* Title */
.title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end), var(--gradient-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    background: var(--input-bg);
    padding: 6px;
    border-radius: 14px;
}

.tab {
    flex: 1;
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 10px;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Glass Input */
.glass-input {
    width: 100%;
    padding: 16px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 14px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
    resize: vertical;
}

.glass-input:focus {
    outline: none;
    border-color: var(--gradient-start);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.glass-input::placeholder {
    color: var(--text-muted);
}

textarea.glass-input {
    min-height: 200px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 13px;
    line-height: 1.6;
}

.glass-input.small {
    width: auto;
    padding: 8px 12px;
    min-width: 80px;
    text-align: center;
}

/* File Upload */
.file-upload-area {
    border: 2px dashed var(--input-border);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.file-upload-area:hover,
.file-upload-area.drag-over {
    border-color: var(--gradient-start);
    background: rgba(102, 126, 234, 0.05);
}

.file-upload-area svg {
    width: 48px;
    height: 48px;
    color: var(--gradient-start);
    margin-bottom: 16px;
}

.file-upload-area p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.file-upload-area span {
    color: var(--text-muted);
    font-size: 14px;
}

.file-btn {
    display: inline-block;
    margin-top: 12px;
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border-radius: 10px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.file-name {
    margin-top: 12px;
    color: var(--success);
    font-size: 14px;
    font-weight: 500;
}

/* JSON Structure */
.json-structure {
    margin: 20px 0;
    background: var(--input-bg);
    border-radius: 14px;
    overflow: hidden;
}

.json-structure summary {
    padding: 16px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.3s ease;
    list-style: none;
}

.json-structure summary::-webkit-details-marker {
    display: none;
}

.json-structure summary::after {
    content: '';
    margin-left: auto;
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(-45deg);
    transition: transform 0.3s ease;
}

.json-structure[open] summary::after {
    transform: rotate(45deg);
}

.json-structure summary:hover {
    color: var(--text-primary);
}

.json-structure summary svg {
    width: 18px;
    height: 18px;
}

.structure-content {
    padding: 0 20px 20px;
}

.structure-content pre {
    background: var(--code-bg);
    padding: 20px;
    border-radius: 12px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.6;
}

.structure-content code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    color: var(--text-primary);
}

.structure-content .key {
    color: var(--gradient-start);
}

.structure-content .string {
    color: var(--success);
}

.structure-notes {
    margin-top: 16px;
    padding: 16px;
    background: var(--info-light);
    border-radius: 12px;
    font-size: 14px;
}

.structure-notes ul {
    margin-top: 8px;
    margin-left: 20px;
}

.structure-notes li {
    margin: 4px 0;
    color: var(--text-secondary);
}

.structure-notes code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

/* Settings Section */
.settings-section {
    margin: 24px 0;
}

.settings-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.settings-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.setting-item {
    padding: 16px;
    background: var(--input-bg);
    border-radius: 14px;
}

.toggle-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
}

.toggle-label span {
    font-weight: 500;
    color: var(--text-primary);
}

.toggle-switch {
    position: relative;
    width: 52px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--input-border);
    transition: all 0.3s ease;
    border-radius: 28px;
}

.toggle-slider::before {
    position: absolute;
    content: '';
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    transition: all 0.3s ease;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(24px);
}

.timer-settings {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--input-border);
    display: none;
}

.timer-settings.show {
    display: block;
}

.timer-settings label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.timer-settings label span {
    font-size: 14px;
    color: var(--text-secondary);
}

.setting-hint {
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: 14px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn svg {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--glass-bg);
    transform: translateY(-2px);
}

#start-quiz-btn {
    width: 100%;
    margin-top: 16px;
}

/* Error Message */
.error-message {
    margin-top: 16px;
    padding: 12px 16px;
    background: var(--error-light);
    color: var(--error);
    border-radius: 10px;
    font-size: 14px;
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

/* Quiz Screen */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    gap: 20px;
    flex-wrap: wrap;
}

.quiz-progress {
    flex: 1;
    min-width: 200px;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.progress-bar {
    height: 8px;
    background: var(--input-bg);
    border-radius: 8px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 8px;
    transition: width 0.4s ease;
    width: 0%;
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    color: var(--text-primary);
}

.quiz-timer.warning {
    color: var(--warning);
    animation: pulse 1s ease infinite;
}

.quiz-timer.danger {
    color: var(--error);
    animation: pulse 0.5s ease infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.quiz-timer svg {
    width: 20px;
    height: 20px;
}

.quiz-timer.hidden {
    display: none;
}

/* Question */
.question-container {
    margin-bottom: 24px;
}

.question-text {
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text-primary);
}

/* Options */
.options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.option-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--input-bg);
    border: 2px solid transparent;
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.option-btn:hover:not(:disabled):not(.selected):not(.correct):not(.incorrect) {
    background: var(--glass-bg);
    border-color: var(--gradient-start);
    transform: translateX(4px);
}

.option-btn.selected {
    border-color: var(--gradient-start);
    background: rgba(102, 126, 234, 0.15);
}

.option-btn.correct {
    border-color: var(--success);
    background: var(--success-light);
}

.option-btn.incorrect {
    border-color: var(--error);
    background: var(--error-light);
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.8;
}

.option-marker {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border-radius: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: all 0.3s ease;
}

.option-btn.selected .option-marker {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.option-btn.correct .option-marker {
    background: var(--success);
    color: white;
}

.option-btn.incorrect .option-marker {
    background: var(--error);
    color: white;
}

.option-text {
    font-size: 15px;
    color: var(--text-primary);
    flex: 1;
}

.option-icon {
    width: 24px;
    height: 24px;
    display: none;
    flex-shrink: 0;
}

.option-btn.correct .option-icon.check,
.option-btn.incorrect .option-icon.cross {
    display: block;
}

.option-btn.correct .option-icon { color: var(--success); }
.option-btn.incorrect .option-icon { color: var(--error); }

/* Quiz Actions */
.quiz-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.quiz-actions .btn {
    flex: 1;
    min-width: 150px;
}

/* Results Screen */
.results-card {
    text-align: center;
}

.results-header {
    margin-bottom: 30px;
}

.trophy-container {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, #ffd700, #ffaa00);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: bounce 2s ease infinite;
}

.trophy-container.bronze {
    background: linear-gradient(135deg, #cd7f32, #8b4513);
}

.trophy-container.silver {
    background: linear-gradient(135deg, #c0c0c0, #808080);
}

.trophy-container.gold {
    background: linear-gradient(135deg, #ffd700, #ffaa00);
}

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

.trophy-icon {
    width: 40px;
    height: 40px;
    color: white;
}

.results-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Score Display */
.score-display {
    margin: 30px 0;
}

.score-circle {
    position: relative;
    width: 160px;
    height: 160px;
    margin: 0 auto;
}

.score-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.score-ring-bg {
    fill: none;
    stroke: var(--input-bg);
    stroke-width: 8;
}

.score-ring-fill {
    fill: none;
    stroke: url(#scoreGradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 1.5s ease;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-percentage {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 30px 0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--input-bg);
    border-radius: 14px;
}

.stat-item svg {
    width: 28px;
    height: 28px;
    padding: 6px;
    border-radius: 8px;
}

.stat-item.correct svg {
    background: var(--success-light);
    color: var(--success);
}

.stat-item.incorrect svg {
    background: var(--error-light);
    color: var(--error);
}

.stat-item.skipped svg {
    background: var(--warning-light);
    color: var(--warning);
}

.stat-item.time svg {
    background: var(--info-light);
    color: var(--info);
}

.stat-info {
    text-align: left;
}

.stat-value {
    display: block;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Review Section */
.review-section {
    margin: 30px 0;
    text-align: left;
}

.review-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.review-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 8px;
}

.review-list::-webkit-scrollbar {
    width: 6px;
}

.review-list::-webkit-scrollbar-track {
    background: var(--input-bg);
    border-radius: 3px;
}

.review-list::-webkit-scrollbar-thumb {
    background: var(--gradient-start);
    border-radius: 3px;
}

.review-item {
    padding: 16px;
    background: var(--input-bg);
    border-radius: 12px;
    border-left: 4px solid var(--input-border);
}

.review-item.correct {
    border-left-color: var(--success);
}

.review-item.incorrect {
    border-left-color: var(--error);
}

.review-item.skipped {
    border-left-color: var(--warning);
}

.review-question {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 14px;
}

.review-answers {
    font-size: 13px;
    color: var(--text-secondary);
}

.review-answers span {
    display: block;
    margin: 4px 0;
}

.review-answers .your-answer {
    color: var(--text-primary);
}

.review-answers .correct-answer {
    color: var(--success);
}

/* Results Actions */
.results-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px 20px;
    color: var(--text-muted);
    font-size: 14px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.footer-copyright {
    margin: 0;
}

.footer a {
    color: var(--gradient-start);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: var(--gradient-end);
}

.footer-social {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--input-bg);
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    transform: translateY(-2px);
}

.footer-social svg {
    width: 18px;
    height: 18px;
}

/* Pop Animation for Correct Answer */
.pop-effect {
    position: fixed;
    pointer-events: none;
    z-index: 999;
    animation: pop 0.6s ease forwards;
}

@keyframes pop {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    50% {
        transform: scale(1.2);
        opacity: 1;
    }
    100% {
        transform: scale(1.5);
        opacity: 0;
    }
}

.sparkle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--gradient-start);
    border-radius: 50%;
}

/* Success Popup */
.success-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    padding: 20px 40px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    z-index: 1001;
    text-align: center;
    animation: popupIn 0.5s ease forwards;
}

@keyframes popupIn {
    0% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 0;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}

.success-popup.hide {
    animation: popupOut 0.3s ease forwards;
}

@keyframes popupOut {
    to {
        transform: translate(-50%, -50%) scale(0);
        opacity: 0;
    }
}

.success-popup svg {
    width: 60px;
    height: 60px;
    color: var(--success);
    margin-bottom: 10px;
}

.success-popup p {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--success);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 20px 16px;
        min-height: calc(100vh - 60px);
    }

    .glass-card {
        padding: 24px 18px;
        border-radius: 20px;
    }

    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }

    .tabs {
        padding: 4px;
    }
    
    .tab {
        padding: 10px 16px;
        font-size: 13px;
    }
    
    textarea.glass-input {
        min-height: 160px;
        font-size: 12px;
    }
    
    .file-upload-area {
        padding: 30px 20px;
    }
    
    .file-upload-area svg {
        width: 40px;
        height: 40px;
    }
    
    .file-upload-area p {
        font-size: 14px;
    }
    
    .json-structure summary {
        padding: 14px 16px;
        font-size: 14px;
    }
    
    .structure-content {
        padding: 0 16px 16px;
    }
    
    .structure-content pre {
        padding: 14px;
        font-size: 11px;
    }
    
    .settings-section h3 {
        font-size: 0.9rem;
    }
    
    .setting-item {
        padding: 14px;
    }
    
    .toggle-label span {
        font-size: 14px;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 16px 12px;
        align-items: flex-start;
        padding-top: 80px;
    }

    .glass-card {
        padding: 20px 16px;
        border-radius: 18px;
    }
    
    .home-card {
        padding: 24px 16px;
    }

    .title {
        font-size: 1.75rem;
    }
    
    .logo {
        width: 60px;
        height: 60px;
    }

    .question-text {
        font-size: 1rem;
        line-height: 1.5;
    }
    
    .option-btn {
        padding: 14px 16px;
        gap: 12px;
    }
    
    .option-marker {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    
    .option-text {
        font-size: 14px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    
    .stat-item {
        padding: 12px;
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
    
    .stat-value {
        font-size: 1.2rem;
    }
    
    .stat-label {
        font-size: 11px;
    }

    .quiz-actions {
        flex-direction: column;
        gap: 10px;
    }

    .quiz-actions .btn {
        width: 100%;
        padding: 12px 20px;
    }

    .results-actions {
        flex-direction: column;
        gap: 10px;
    }

    .results-actions .btn {
        width: 100%;
        padding: 12px 20px;
    }

    .quiz-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        margin-bottom: 16px;
    }

    .quiz-timer {
        justify-content: center;
        padding: 8px 14px;
    }
    
    .progress-text {
        font-size: 13px;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .theme-toggle-container {
        top: 12px;
        right: 12px;
    }
    
    .theme-btn {
        width: 42px;
        height: 42px;
        border-radius: 12px;
    }
    
    .theme-icon {
        width: 20px;
        height: 20px;
    }
    
    .footer {
        padding: 16px 12px;
        font-size: 12px;
    }
    
    .score-circle {
        width: 130px;
        height: 130px;
    }
    
    .score-percentage {
        font-size: 2rem;
    }
    
    .results-title {
        font-size: 1.5rem;
    }
    
    .results-subtitle {
        font-size: 1rem;
    }
    
    .trophy-container {
        width: 60px;
        height: 60px;
    }
    
    .trophy-icon {
        width: 30px;
        height: 30px;
    }
    
    .review-section h3 {
        font-size: 1rem;
    }
    
    .review-item {
        padding: 12px;
    }
    
    .review-question {
        font-size: 13px;
    }
    
    .review-answers {
        font-size: 12px;
    }
    
    .success-popup {
        padding: 16px 30px;
    }
    
    .success-popup svg {
        width: 50px;
        height: 50px;
    }
    
    .success-popup p {
        font-size: 1rem;
    }
}

@media (max-width: 400px) {
    .container {
        padding: 12px 10px;
        padding-top: 70px;
    }
    
    .glass-card {
        padding: 16px 14px;
        border-radius: 16px;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .logo {
        width: 50px;
        height: 50px;
    }
    
    .tabs {
        gap: 4px;
    }
    
    .tab {
        padding: 8px 12px;
        font-size: 12px;
    }
    
    .question-text {
        font-size: 0.95rem;
    }
    
    .option-btn {
        padding: 12px 14px;
        gap: 10px;
        border-radius: 12px;
    }
    
    .option-marker {
        width: 28px;
        height: 28px;
        font-size: 12px;
        border-radius: 8px;
    }
    
    .option-text {
        font-size: 13px;
    }
    
    .stats-grid {
        gap: 8px;
    }
    
    .stat-item {
        padding: 10px;
    }
    
    .stat-item svg {
        width: 24px;
        height: 24px;
    }
    
    .stat-value {
        font-size: 1.1rem;
    }
    
    .structure-content pre {
        font-size: 10px;
        padding: 12px;
    }
    
    .setting-item {
        padding: 12px;
    }
    
    .toggle-label span {
        font-size: 13px;
    }
    
    .toggle-switch {
        width: 46px;
        height: 26px;
    }
    
    .toggle-slider::before {
        width: 20px;
        height: 20px;
    }
    
    .toggle-switch input:checked + .toggle-slider::before {
        transform: translateX(20px);
    }
    
    .theme-btn {
        width: 38px;
        height: 38px;
    }
    
    .theme-icon {
        width: 18px;
        height: 18px;
    }
}

/* Safe area for notched devices */
@supports (padding: max(0px)) {
    .container {
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
        padding-bottom: max(20px, env(safe-area-inset-bottom));
    }
}

/* SVG Gradient for Score Ring */
svg defs {
    position: absolute;
}

/* ==========================================
   Welcome Modal & Help Button
   ========================================== */

/* Help Button */
.help-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px var(--glass-shadow);
    z-index: 90;
}

.help-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 25px var(--glass-shadow);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

.help-btn:hover svg {
    color: white;
}

.help-btn svg {
    width: 24px;
    height: 24px;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 20px;
}

/* Light theme modal overlay */
body.theme-light .modal-overlay {
    background: rgba(255, 255, 255, 0.6);
}

/* Dark theme modal overlay */
body.theme-dark .modal-overlay {
    background: rgba(0, 0, 0, 0.5);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* Modal */
.modal {
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.show .modal {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: none;
    background: var(--input-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--error-light);
}

.modal-close svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.modal-close:hover svg {
    color: var(--error);
}

/* Modal Header */
.modal-header {
    text-align: center;
    margin-bottom: 24px;
}

.modal-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.modal-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Modal Content */
.modal-content {
    margin-bottom: 24px;
}

.guide-section {
    margin-bottom: 24px;
}

.guide-section:last-child {
    margin-bottom: 0;
}

.guide-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.guide-section > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Steps List */
.steps-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 12px;
    background: var(--input-bg);
    border-radius: 12px;
}

.step-number {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.step-content strong {
    display: block;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin: 0;
}

/* AI Prompt Box */
.ai-prompt-box {
    margin-top: 12px;
    background: var(--code-bg);
    border-radius: 12px;
    overflow: hidden;
}

.ai-prompt-box pre {
    padding: 16px;
    margin: 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 12px;
    line-height: 1.5;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 200px;
    overflow-y: auto;
}

.copy-prompt-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px;
    border: none;
    background: var(--input-bg);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    font-family: inherit;
}

.copy-prompt-btn:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.copy-prompt-btn svg {
    width: 18px;
    height: 18px;
}

.copy-prompt-btn.copied {
    background: var(--success);
    color: white;
}

/* Modal Footer */
.modal-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 20px;
    border-top: 1px solid var(--input-border);
}

.dont-show-again {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
}

.dont-show-again input {
    width: 16px;
    height: 16px;
    accent-color: var(--gradient-start);
}

/* Modal Responsive */
@media (max-width: 600px) {
    .modal-overlay {
        padding: 16px;
        align-items: flex-end;
    }

    .modal {
        max-height: 85vh;
        padding: 20px 16px;
        border-radius: 20px 20px 0 0;
    }
    
    .modal-overlay.show .modal {
        transform: scale(1) translateY(0);
    }

    .modal-header h2 {
        font-size: 1.25rem;
    }

    .modal-icon {
        width: 50px;
        height: 50px;
    }

    .modal-icon svg {
        width: 26px;
        height: 26px;
    }

    .step {
        padding: 10px;
    }

    .step-number {
        width: 24px;
        height: 24px;
        font-size: 12px;
    }

    .ai-prompt-box pre {
        font-size: 11px;
        padding: 12px;
        max-height: 150px;
    }

    .modal-footer {
        flex-direction: column;
        gap: 12px;
    }

    .modal-footer .btn {
        width: 100%;
    }

    .help-btn {
        width: 44px;
        height: 44px;
        bottom: 16px;
        right: 16px;
    }

    .help-btn svg {
        width: 20px;
        height: 20px;
    }
}

@media (max-width: 400px) {
    .modal {
        padding: 16px 14px;
    }

    .guide-section h3 {
        font-size: 0.9rem;
    }

    .step-content strong {
        font-size: 0.85rem;
    }

    .step-content p {
        font-size: 0.75rem;
    }
}