/* Physics Papers 2025 Page Styles */
:root {
    /* Your Color Scheme */
    --bg-primary: #0b0b0b;
    --bg-secondary: #111111;
    --bg-card: #181818;
    --text-primary: #ffffff;
    --text-secondary: #bdbdbd;
    --accent-primary: #f97316;
    --accent-secondary: #ff9a3d;
    --border-color: #2a2a2a;
    --success-color: #22c55e;
    --info-color: #3b82f6;
    --warning-color: #f59e0b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Remove gap between header and hero */
#header-container + main {
    margin-top: 0;
}

/* Hero Section */
.paper-hero {
    padding: 30px 0 40px;
    background: linear-gradient(135deg, 
        #0b0b0b 0%, 
        #151515 25%, 
        #1a0a00 50%, 
        #331100 75%, 
        #4a1a00 100%);
    position: relative;
    overflow: hidden;
    border-bottom: 3px solid var(--accent-primary);
    
}

.paper-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(249, 115, 22, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* Breadcrumb */
.breadcrumb {
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.3s;
}

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

.breadcrumb i {
    font-size: 0.7rem;
    opacity: 0.7;
}

/* Paper Info */
.paper-info {
    text-align: center;
    margin-bottom: 30px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(90deg, 
        var(--accent-primary) 0%, 
        var(--accent-secondary) 50%, 
        var(--accent-primary) 100%);
    color: white;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.1);
    animation: badgeGlow 3s ease-in-out infinite;
}

@keyframes badgeGlow {
    0%, 100% { 
        box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4);
    }
    50% { 
        box-shadow: 0 4px 25px rgba(249, 115, 22, 0.7);
    }
}

.hero-badge i {
    margin-right: 8px;
    font-size: 0.95rem;
}

.paper-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 25px;
    color: var(--text-primary);
    line-height: 1.2;
    background: linear-gradient(to right, 
        #ffffff 0%, 
        #ffb380 50%, 
        #ffffff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Hero Toggle - Beside each other */
.hero-toggle {
    margin: 30px auto 25px;
    max-width: 500px;
}

.toggle-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.toggle-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    min-width: 150px;
    justify-content: center;
}

.toggle-btn i {
    font-size: 1.1rem;
    transition: color 0.3s;
}

.toggle-btn.active {
    background: rgba(249, 115, 22, 0.15);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.toggle-btn.active i {
    color: var(--accent-primary);
}

.toggle-btn:hover:not(.active) {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.toggle-indicator {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    opacity: 0;
    transform: translateY(3px);
    transition: all 0.3s;
}

.toggle-btn.active .toggle-indicator {
    opacity: 1;
    transform: translateY(0);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Paper Content Section - FIXED FOR MOBILE */
.paper-content-section {
    padding: 40px 0;
    display: none;
    background: var(--bg-primary);
}

.paper-content-section.active {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

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

.paper-wrapper {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 40px;
    border: 1px solid var(--border-color);
    max-width: 100%;
    margin: 0 auto;
}

/* Paper Header */
.paper-header {
    margin-bottom: 30px;
}

.paper-heading {
    font-family: 'Montserrat', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.paper-heading i {
    color: var(--accent-primary);
    font-size: 1.8rem;
}

.paper-divider {
    height: 2px;
    background: linear-gradient(90deg, 
        rgba(249, 115, 22, 0.5), 
        rgba(249, 115, 22, 0.2), 
        rgba(249, 115, 22, 0.5));
    border-radius: 2px;
}

/* PDF Preview Section */
.pdf-preview-section {
    margin-bottom: 40px;
}

.pdf-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.pdf-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.pdf-title i {
    color: var(--info-color);
}

.page-count {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-left: 10px;
    font-weight: normal;
}

.pdf-tools {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 6px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tool-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.3s;
    flex-shrink: 0;
}

.tool-btn:hover:not(:disabled) {
    background: rgba(249, 115, 22, 0.2);
    color: var(--text-primary);
}

.tool-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.current-page,
.page-separator,
.total-pages {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.current-page {
    min-width: 18px;
    text-align: center;
}

.page-separator {
    opacity: 0.7;
}

/* PDF Viewer Container */
.pdf-viewer-container {
    margin-bottom: 30px;
}

.pdf-viewer-box {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

/* PDF.js Viewer */
.pdf-viewer {
    position: relative;
    min-height: 600px;
    background: var(--bg-secondary);
}

.pdf-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    color: var(--text-primary);
    z-index: 10;
}

.loading-spinner {
    margin-bottom: 20px;
}

.loading-spinner i {
    font-size: 3rem;
    color: var(--accent-primary);
}

/* PDF Scroll Container with Your Color Scheme */
.pdf-scroll-container {
    width: 100%;
    height: 600px;
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--bg-primary);
    position: relative;
}

.pdf-pages-container {
    min-height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    gap: 20px;
}

.pdf-page-canvas {
    background: var(--bg-card);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    margin-bottom: 10px;
    display: block;
    max-width: 100%;
    height: auto;
    border: 1px solid var(--border-color);
}

/* PDF Controls - Simple */
.pdf-controls-simple {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.pdf-control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    flex-shrink: 0;
}

.pdf-control-btn:hover {
    background: rgba(249, 115, 22, 0.2);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.zoom-level {
    min-width: 60px;
    text-align: center;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.listening-audio-player {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 22px;
    padding: 20px 22px;
    margin: -14px 0 28px;
    border: 1px solid rgba(249, 115, 22, 0.24);
    border-radius: 14px;
    background: rgba(249, 115, 22, 0.08);
}

.listening-audio-copy {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 220px;
}

.listening-audio-icon {
    width: 46px;
    height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 46px;
    border-radius: 50%;
    color: #ffffff;
    background: linear-gradient(135deg, #f97316, #fb923c);
    box-shadow: 0 14px 26px rgba(249, 115, 22, 0.28);
}

.listening-audio-copy h3 {
    margin: 0 0 4px;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 700;
}

.listening-audio-copy p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.listening-audio-player audio {
    display: none;
}

.listening-audio-controls {
    width: min(520px, 100%);
    display: grid;
    grid-template-columns: 44px auto 1fr 68px auto;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border: 1px solid rgba(249, 115, 22, 0.18);
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.05);
}

.listening-play-button {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    color: #ffffff;
    background: linear-gradient(135deg, #f97316, #fb923c);
    cursor: pointer;
    box-shadow: 0 12px 24px rgba(249, 115, 22, 0.22);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.listening-play-button:hover,
.listening-play-button:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 16px 30px rgba(249, 115, 22, 0.28);
    outline: none;
}

.listening-audio-time {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.listening-audio-seek {
    --seek-progress: 0%;
    height: 8px;
    width: 100%;
    appearance: none;
    border-radius: 999px;
    background: linear-gradient(90deg, #f97316 0 var(--seek-progress), rgba(148, 163, 184, 0.3) var(--seek-progress) 100%);
    cursor: pointer;
}

.listening-audio-seek::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 3px solid #ffffff;
    border-radius: 50%;
    background: #f97316;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.24);
}

.listening-audio-seek::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border: 3px solid #ffffff;
    border-radius: 50%;
    background: #f97316;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.24);
}

.listening-audio-seek:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.listening-audio-timestamp {
    width: 68px;
    min-width: 0;
    height: 34px;
    border: 1px solid rgba(148, 163, 184, 0.26);
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.16);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    text-align: center;
    outline: none;
}

.listening-audio-timestamp:focus {
    border-color: rgba(249, 115, 22, 0.7);
    box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.14);
}

.listening-audio-timestamp:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.listening-audio-player.is-unavailable {
    border-color: rgba(148, 163, 184, 0.28);
    background: rgba(148, 163, 184, 0.08);
}

.listening-audio-player.is-unavailable .listening-audio-icon {
    background: #64748b;
    box-shadow: none;
}

.listening-audio-player.is-unavailable .listening-audio-copy {
    min-width: 0;
}

.listening-audio-player.is-unavailable .listening-audio-controls {
    display: none;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 25px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.action-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.action-btn.is-disabled {
    opacity: 0.55;
    pointer-events: none;
    cursor: not-allowed;
}

.action-btn.is-disabled:hover {
    transform: none;
    box-shadow: none;
}

.key-btn:hover {
    border-color: var(--success-color);
}

.download-btn:hover {
    border-color: var(--accent-primary);
}

.btn-icon {
    width: 60px;
    height: 60px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.key-btn .btn-icon {
    background: rgba(34, 197, 94, 0.1);
}

.download-btn .btn-icon {
    background: rgba(249, 115, 22, 0.1);
}

.btn-icon i {
    font-size: 1.8rem;
    color: var(--info-color);
}

.key-btn .btn-icon i {
    color: var(--success-color);
}

.download-btn .btn-icon i {
    color: var(--accent-primary);
}

.btn-content {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.btn-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

.btn-arrow {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: transform 0.3s;
    flex-shrink: 0;
}

.action-btn:hover .btn-arrow {
    transform: translateX(5px);
    color: var(--accent-primary);
}

/* ============================================ */
/* UPDATED DEMO BANNER - WITH TWO BUTTONS      */
/* ============================================ */
.coaching-banner {
    padding: 60px 20px;
    background: var(--bg-secondary);
}

.demo-content {
    background: linear-gradient(135deg, 
        rgba(249, 115, 22, 0.15) 0%, 
        rgba(249, 115, 22, 0.05) 100%);
    border: 1px solid rgba(249, 115, 22, 0.2);
    border-radius: 20px;
    padding: 50px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
    max-width: 1000px;
    margin: 0 auto;
}

.demo-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-primary), #ff9a3d);
}

.demo-content h2 {
    font-size: 2.2rem;
    color: var(--text-primary);
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.3;
}

.demo-subtitle {
    font-size: 1.2rem;
    color: var(--accent-primary);
    margin-bottom: 15px;
    font-weight: 600;
}

.demo-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 35px;
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Hero Button Base Styles */
.hero-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    min-width: 220px;
    white-space: nowrap;
    margin: 0 8px;
}

/* Primary Button */
.hero-button.primary {
    background: linear-gradient(135deg, var(--accent-primary), #ff9a3d);
    color: white;
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.3);
}

.hero-button.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(249, 115, 22, 0.4);
}

/* Secondary Button */
.hero-button.secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--accent-primary);
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.2);
}

.hero-button.secondary:hover {
    background: rgba(249, 115, 22, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(249, 115, 22, 0.3);
}

.hero-button i {
    font-size: 1.1rem;
}

/* Demo Note */
.demo-note {
    margin-top: 32px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 50px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

/* Gradient Overlay */
.gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(
        circle at 20% 50%,
        rgba(249, 115, 22, 0.15) 0%,
        transparent 50%
    ),
    radial-gradient(
        circle at 80% 20%,
        rgba(249, 115, 22, 0.1) 0%,
        transparent 50%
    );
    z-index: 1;
    pointer-events: none;
}

/* ========================= */
/* FULLSCREEN STYLES - YOUR COLOR SCHEME */
/* ========================= */
.pdf-viewer-box:fullscreen {
    background: var(--bg-primary);
    width: 100vw;
    height: 100vh;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    border-radius: 0;
    border: none;
}

.pdf-viewer-box:fullscreen .pdf-viewer {
    flex: 1;
    min-height: auto;
    background: var(--bg-primary);
}

.pdf-viewer-box:fullscreen .pdf-scroll-container {
    height: calc(100vh - 120px);
    background: var(--bg-primary);
}

.pdf-viewer-box:fullscreen .pdf-pages-container {
    background: var(--bg-primary);
    padding: 30px;
}

.pdf-viewer-box:fullscreen .pdf-page-canvas {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.pdf-viewer-box:fullscreen .pdf-controls-simple {
    background: var(--bg-secondary);
    padding: 20px;
    border-top: 2px solid var(--border-color);
}

.pdf-viewer-box:fullscreen .pdf-control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.pdf-viewer-box:fullscreen .pdf-control-btn:hover {
    background: rgba(249, 115, 22, 0.3);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Webkit fullscreen */
.pdf-viewer-box:-webkit-full-screen {
    background: var(--bg-primary);
    width: 100vw;
    height: 100vh;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    border-radius: 0;
    border: none;
}

.pdf-viewer-box:-webkit-full-screen .pdf-viewer {
    flex: 1;
    min-height: auto;
    background: var(--bg-primary);
}

.pdf-viewer-box:-webkit-full-screen .pdf-scroll-container {
    height: calc(100vh - 120px);
    background: var(--bg-primary);
}

.pdf-viewer-box:-webkit-full-screen .pdf-pages-container {
    background: var(--bg-primary);
    padding: 30px;
}

.pdf-viewer-box:-webkit-full-screen .pdf-page-canvas {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.pdf-viewer-box:-webkit-full-screen .pdf-controls-simple {
    background: var(--bg-secondary);
    padding: 20px;
    border-top: 2px solid var(--border-color);
}

/* Loading State for Multiple Pages */
.pdf-loading-multiple {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-primary);
    z-index: 5;
    background: var(--bg-card);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.loading-progress {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    margin: 20px auto;
    overflow: hidden;
}

.loading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    width: 0%;
    transition: width 0.3s;
    border-radius: 2px;
}

/* Scrollbar Styling - Your Color Scheme */
.pdf-scroll-container::-webkit-scrollbar {
    width: 10px;
}

.pdf-scroll-container::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.pdf-scroll-container::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, 
        var(--accent-primary), 
        var(--accent-secondary));
    border-radius: 4px;
    border: 2px solid var(--bg-secondary);
}

.pdf-scroll-container::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(to bottom, 
        var(--accent-secondary), 
        var(--accent-primary));
}

.pdf-scroll-container::-webkit-scrollbar-corner {
    background: var(--bg-primary);
}

/* Fullscreen scrollbar */
.pdf-viewer-box:fullscreen .pdf-scroll-container::-webkit-scrollbar {
    width: 12px;
}

.pdf-viewer-box:fullscreen .pdf-scroll-container::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.pdf-viewer-box:fullscreen .pdf-scroll-container::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, 
        var(--accent-primary), 
        var(--accent-secondary));
    border: 3px solid var(--bg-primary);
}

/* ========================= */
/* RESPONSIVE BREAKPOINTS - FIXED FOR MOBILE */
/* ========================= */

/* Tablet (768px and up) */
@media (min-width: 768px) {
    .paper-hero {
        padding: 50px 0 60px;
        margin-top: -60px;
    }
    
    .paper-title {
        font-size: 3.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .toggle-buttons {
        gap: 20px;
    }
    
    .toggle-btn {
        min-width: 160px;
        padding: 16px 32px;
    }
    
    .paper-heading {
        font-size: 2.2rem;
    }
    
    .pdf-scroll-container {
        height: 700px;
    }
    
    .action-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (992px and up) */
@media (min-width: 992px) {
    .paper-title {
        font-size: 3.5rem;
    }
    
    .pdf-viewer {
        min-height: 700px;
    }
    
    .pdf-scroll-container {
        height: 750px;
    }
    
    .paper-hero {
        padding: 60px 0 80px;
        margin-top: 0px;
    }
}

/* ========================================= */
/* MOBILE FIXES (767px and below) - UPDATED  */
/* ========================================= */
@media (max-width: 767px) {
    /* Container adjustments for mobile */
    .container {
        padding: 0 0;
        width: 100%;
        max-width: 100%;
    }
    
    .demo-image {
        display: none;
    }
    
    .paper-hero {
        margin-top: -60px;
        padding: 25px 15px 30px;
    }
    
    .breadcrumb {
        font-size: 0.75rem;
        gap: 5px;
        margin-bottom: 15px;
        padding: 0 15px;
    }
    
    .hero-badge {
        font-size: 0.8rem;
        padding: 6px 12px;
        margin-bottom: 12px;
    }
    
    .paper-title {
        font-size: 1.8rem;
        margin-bottom: 15px;
        line-height: 1.3;
        padding: 0 15px;
    }
    
    /* Toggle buttons - smaller and better spaced */
    .toggle-buttons {
        gap: 8px;
        justify-content: center;
        padding: 0 15px;
    }
    
    .toggle-btn {
        min-width: 120px;
        padding: 10px 15px;
        font-size: 0.85rem;
        gap: 6px;
    }
    
    .toggle-btn i {
        font-size: 0.9rem;
    }
    
    .hero-subtitle {
        font-size: 0.9rem;
        margin-top: 15px;
        line-height: 1.5;
        padding: 0 15px;
    }
    
    /* PAPER CONTENT SECTION - FIXED TO TOUCH BOTH SIDES */
    .paper-content-section {
        padding: 30px 0;
        width: 100%;
    }
    
    .paper-wrapper {
        padding: 20px 15px;
        margin: 0;
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-top: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        max-width: 100%;
    }
    
    /* Paper heading - smaller and stacked */
    .paper-heading {
        font-size: 1.2rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        margin-bottom: 15px;
    }
    
    .paper-heading i {
        font-size: 1.2rem;
    }
    
    /* PDF header - stacked layout */
    .pdf-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        margin-bottom: 15px;
    }
    
    .pdf-title {
        font-size: 1.1rem;
        gap: 8px;
    }
    
    .page-count {
        font-size: 0.8rem;
        margin-left: 0;
        display: block;
        width: 100%;
    }
    
    .pdf-tools {
        align-self: stretch;
        justify-content: center;
        padding: 8px;
        gap: 6px;
    }
    
    .tool-btn {
        width: 28px;
        height: 28px;
        font-size: 0.8rem;
    }
    
    .current-page,
    .page-separator,
    .total-pages {
        font-size: 0.8rem;
    }
    
    .current-page {
        min-width: 16px;
    }
    
    /* PDF viewer - optimized height */
    .pdf-viewer {
        min-height: 300px;
    }
    
    .pdf-scroll-container {
        height: 400px;
    }
    
    .pdf-pages-container {
        padding: 10px;
        gap: 12px;
    }
    
    /* PDF controls - compact */
    .pdf-controls-simple {
        gap: 10px;
        padding: 10px;
    }
    
    .pdf-control-btn {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }
    
    .zoom-level {
        min-width: 50px;
        font-size: 0.8rem;
    }
    
    /* Action buttons - stacked and compact */
    .action-buttons {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .listening-audio-player {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
        margin: -8px 0 22px;
        padding: 18px;
    }

    .listening-audio-controls {
        grid-template-columns: 44px 1fr 72px auto;
    }

    .listening-audio-controls .listening-audio-time:first-of-type {
        display: none;
    }

    .listening-audio-player audio {
        width: 100%;
    }

    .listening-audio-timestamp {
        width: 72px;
    }
    
    .action-btn {
        padding: 15px;
        gap: 12px;
        min-height: auto;
    }
    
    .btn-icon {
        width: 45px;
        height: 45px;
        border-radius: 10px;
    }
    
    .btn-icon i {
        font-size: 1.3rem;
    }
    
    .btn-content h3 {
        font-size: 1rem;
        margin-bottom: 4px;
        white-space: normal;
        line-height: 1.3;
    }
    
    .btn-content p {
        font-size: 0.8rem;
        -webkit-line-clamp: 2;
        line-clamp: 2;
        line-height: 1.4;
    }
    
    .btn-arrow {
        font-size: 1rem;
    }
    
    /* Demo banner - fully stacked */
    .coaching-banner {
        padding: 40px 20px;
    }
    
    .demo-content {
        padding: 40px 25px;
    }
    
    .demo-content h2 {
        font-size: 1.6rem;
    }
    
    .demo-subtitle {
        font-size: 1.1rem;
    }
    
    .demo-description {
        margin-bottom: 30px;
        font-size: 0.95rem;
    }
    
    /* Stack buttons vertically on mobile */
    .hero-button {
        display: flex;
        width: 100%;
        max-width: 320px;
        margin: 0 auto 12px auto;
        padding: 14px 24px;
        font-size: 0.95rem;
        white-space: normal;
        word-break: keep-all;
    }
    
    .demo-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-button.primary {
        margin-bottom: 16px;
    }
    
    .hero-button.secondary {
        margin-bottom: 8px;
    }
    
    .demo-note {
        margin-top: 28px;
        font-size: 0.85rem;
        gap: 8px;
        padding: 10px 16px;
        width: 100%;
        text-align: center;
        border-radius: 30px;
    }
    
    /* Fullscreen mobile - optimized */
    .pdf-viewer-box:fullscreen .pdf-scroll-container {
        height: calc(100vh - 100px);
    }
    
    .pdf-viewer-box:fullscreen .pdf-pages-container {
        padding: 15px;
    }
}

/* ========================================= */
/* SMALL MOBILE FIXES (480px and below)      */
/* ========================================= */
@media (max-width: 480px) {
    .paper-title {
        font-size: 1.5rem;
    }
    
    .toggle-btn {
        min-width: 110px;
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    .hero-subtitle {
        font-size: 0.85rem;
        padding: 0 15px;
    }
    
    .paper-heading {
        font-size: 1.1rem;
    }
    
    .pdf-title {
        font-size: 1rem;
    }
    
    .pdf-scroll-container {
        height: 350px;
    }
    
    .action-btn {
        padding: 12px;
    }
    
    .btn-icon {
        width: 40px;
        height: 40px;
    }
    
    .btn-icon i {
        font-size: 1.2rem;
    }
    
    .btn-content h3 {
        font-size: 0.95rem;
    }
    
    .btn-content p {
        font-size: 0.75rem;
        line-clamp: 2;
    }
    
    /* Make sure buttons don't overflow */
    .pdf-tools {
        overflow: hidden;
    }
    
    .action-buttons {
        overflow: hidden;
    }
    
    .coaching-banner {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .demo-content {
        padding: 30px 20px;
    }
    
    .demo-content h2 {
        font-size: 1.4rem;
    }
    
    .hero-button {
        max-width: 280px;
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .hero-button i {
        font-size: 1rem;
    }
    
    .demo-note {
        font-size: 0.8rem;
        padding: 8px 12px;
        margin-top: 24px;
    }
}

/* ========================================= */
/* EXTRA SMALL MOBILE (360px and below)      */
/* ========================================= */
@media (max-width: 360px) {
    .paper-title {
        font-size: 1.3rem;
    }
    
    .toggle-btn {
        min-width: 100px;
        padding: 6px 10px;
        font-size: 0.75rem;
    }
    
    .toggle-btn i {
        font-size: 0.8rem;
    }
    
    .paper-heading {
        font-size: 1rem;
    }
    
    .pdf-scroll-container {
        height: 300px;
    }
    
    .pdf-tools {
        padding: 6px;
        gap: 4px;
    }
    
    .tool-btn {
        width: 26px;
        height: 26px;
    }
    
    .action-btn {
        padding: 10px;
        gap: 8px;
    }
    
    .btn-icon {
        width: 36px;
        height: 36px;
    }
    
    .btn-icon i {
        font-size: 1rem;
    }
    
    .btn-content h3 {
        font-size: 0.9rem;
    }
    
    .btn-content p {
        font-size: 0.7rem;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .toggle-btn,
    .action-btn,
    .hero-button,
    .pdf-control-btn,
    .tool-btn {
        min-height: 44px;
        touch-action: manipulation;
    }
    
    .toggle-btn:active,
    .action-btn:active,
    .hero-button:active,
    .pdf-control-btn:active,
    .tool-btn:active {
        transform: scale(0.97);
    }
    
    .toggle-btn:hover,
    .action-btn:hover,
    .hero-button:hover,
    .pdf-control-btn:hover,
    .tool-btn:hover {
        transform: none;
    }
    
    .pdf-scroll-container {
        -webkit-overflow-scrolling: touch;
    }
    
    /* Prevent text selection on buttons */
    .toggle-btn,
    .action-btn,
    .hero-button,
    .pdf-control-btn,
    .tool-btn {
        user-select: none;
        -webkit-user-select: none;
    }
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
    .hero-badge,
    .toggle-btn,
    .action-btn,
    .hero-button,
    .pdf-control-btn,
    .paper-content-section,
    .pdf-page-canvas,
    .tool-btn {
        transition: none;
        animation: none;
    }
    
    .toggle-btn:hover,
    .action-btn:hover,
    .hero-button:hover,
    .pdf-control-btn:hover,
    .tool-btn:hover {
        transform: none;
    }
}

/* Prevent horizontal scroll on mobile */
@media (max-width: 767px) {
    body {
        overflow-x: hidden;
    }
    
    .paper-wrapper,
    .pdf-viewer-box,
    .pdf-scroll-container {
        max-width: 100%;
        overflow-x: hidden;
    }
    
    /* Ensure paper content touches both sides */
    .paper-content-section .container {
        padding: 0;
    }
}

/* Ensure text doesn't overflow in buttons */
.btn-content h3,
.btn-content p,
.pdf-title,
.page-count {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* PDF pages container - prevent horizontal overflow */
.pdf-pages-container {
    max-width: 100%;
    box-sizing: border-box;
}

.pdf-page-canvas {
    max-width: 100% !important;
    height: auto !important;
}

/* ============================================
   MODAL COMPONENT - Add this to your CSS files
   ============================================ */

/* Demo Form Popup Modal */
.popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.popup-overlay.active {
    display: flex;
}

.popup-container {
    background: var(--popup-bg, #1a1a1a);
    border: 1px solid rgba(249, 115, 22, 0.3);
    border-radius: 20px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    animation: popupFadeIn 0.3s ease;
}

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

.popup-header {
    padding: 25px 30px;
    border-bottom: 1px solid rgba(249, 115, 22, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: var(--popup-bg, #1a1a1a);
    border-radius: 20px 20px 0 0;
    z-index: 2;
}

.popup-header h2 {
    font-size: 1.5rem;
    color: var(--text-main, #ffffff);
    font-weight: 700;
    margin: 0;
}

.popup-close {
    background: none;
    border: none;
    color: var(--text-muted, #bdbdbd);
    font-size: 2rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.popup-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent, #f97316);
}

.popup-body {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-main, #ffffff);
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-main, #ffffff);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent, #f97316);
    background: rgba(255, 255, 255, 0.1);
}

.form-group input::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.form-group select option {
    background: var(--popup-bg, #1a1a1a);
    color: var(--text-main, #ffffff);
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #25D366, #128C7E);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 25px;
    transition: transform 0.2s ease;
}

.submit-btn:hover {
    transform: translateY(-2px);
}

.submit-btn i {
    font-size: 1.2rem;
}

/* Custom Modal (Success/Error) */
.custom-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(6px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: modalFadeIn 0.2s ease;
}

.custom-modal-container {
    background: var(--popup-bg, #1a1a1a);
    border: 1px solid rgba(249, 115, 22, 0.4);
    border-radius: 28px;
    padding: 36px 28px;
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: 0 30px 50px rgba(0, 0, 0, 0.6);
    animation: modalSlideIn 0.25s ease;
}

.custom-modal-container.success {
    border-color: #10b981;
}

.custom-modal-container.error {
    border-color: #ef4444;
}

.custom-modal-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.custom-modal-container.success .custom-modal-icon {
    color: #10b981;
}

.custom-modal-container.error .custom-modal-icon {
    color: #ef4444;
}

.custom-modal-message {
    color: var(--text-main, #ffffff);
    font-size: 1.05rem;
    line-height: 1.5;
    margin-bottom: 30px;
}

.custom-modal-close-btn {
    background: linear-gradient(135deg, var(--accent, #f97316), var(--accent-light, #ff9a3d));
    color: white;
    border: none;
    padding: 12px 36px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.custom-modal-close-btn:hover {
    transform: translateY(-2px);
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* Responsive Modal Styles */
@media (max-width: 768px) {
    .popup-container {
        max-height: 85vh;
    }

    .popup-header {
        padding: 20px 25px;
    }

    .popup-header h2 {
        font-size: 1.3rem;
    }

    .popup-body {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .custom-modal-container {
        padding: 30px 20px;
    }

    .custom-modal-icon {
        font-size: 3rem;
    }

    .custom-modal-message {
        font-size: 0.95rem;
    }
    
    .popup-body {
        padding: 20px;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    .form-group input,
    .form-group select {
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    
    .submit-btn {
        padding: 14px;
        font-size: 1rem;
    }
}

/* ========== BUTTON STYLES for open-popup-btn ========== */
.open-popup-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg, #f97316, #ff9a3d);
    color: white;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.open-popup-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(249, 115, 22, 0.4);
}

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

.open-popup-btn i {
    font-size: 1.1rem;
}

/* Different sizes for buttons */
.open-popup-btn.small {
    padding: 8px 20px;
    font-size: 0.85rem;
}

.open-popup-btn.large {
    padding: 18px 45px;
    font-size: 1.2rem;
}

.open-popup-btn.outline {
    background: transparent;
    border: 2px solid #f97316;
    color: #f97316;
    box-shadow: none;
}

.open-popup-btn.outline:hover {
    background: rgba(249, 115, 22, 0.1);
    transform: translateY(-2px);
}