:root {
    --glass-bg: rgba(255, 255, 255, 0.12);
    --glass-bg-dark: rgba(60, 40, 20, 0.15);
    --glass-bg-light: rgba(255, 255, 255, 0.18);
    --blur-light: blur(10px);
    --blur-medium: blur(20px);
    --blur-heavy: blur(30px);
    --border-glass: 1px solid rgba(255, 255, 255, 0.25);
    --border-subtle: 1px solid rgba(255, 255, 255, 0.15);
    --border-glow: 1px solid rgba(251, 191, 36, 0.3);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.18);
    --shadow-glow: 0 0 40px rgba(251, 191, 36, 0.2);
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-xl: 40px;
    --radius-full: 9999px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --font-display: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
    --font-body: 'Noto Sans SC', 'Source Han Sans CN', sans-serif;
    --amber-50: #fffbeb;
    --amber-100: #fef3c7;
    --amber-200: #fde68a;
    --amber-300: #fcd34d;
    --amber-400: #fbbf24;
    --amber-500: #f59e0b;
    --amber-600: #d97706;
    --amber-700: #b45309;
    --amber-800: #92400e;
    --amber-900: #78350f;
    --bronze-50: #fdf8f3;
    --bronze-100: #f5e6d3;
    --bronze-200: #e8d0b3;
    --bronze-300: #d4a574;
    --bronze-400: #c49a6c;
    --bronze-500: #a67c52;
    --bronze-600: #8b6914;
    --bronze-700: #6b4f12;
    --rose-gold: #b76e79;
    --rose-gold-light: #e8b4b8;
    --cream: #faf6f0;
    --warm-white: #fffcf7;
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.75);
    --text-muted: rgba(255, 255, 255, 0.55);
    --text-light: rgba(255, 255, 255, 0.4);
    --bg-primary: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --bg-glass: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.1);
    --border-medium: rgba(255, 255, 255, 0.2);
    --border-accent: rgba(251, 191, 36, 0.4);
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 40px rgba(0, 0, 0, 0.15);
    --shadow-elevated: 0 20px 60px rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
    line-height: 1.7;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(251, 191, 36, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(183, 110, 121, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(15, 52, 96, 0.5) 0%, transparent 70%);
    pointer-events: none;
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: -1;
}

.page-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 64px;
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: var(--blur-heavy);
    -webkit-backdrop-filter: var(--blur-heavy);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: all var(--transition-smooth);
}

.page-header.scrolled {
    background: rgba(255, 255, 255, 0.12);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.logo-img {
    height: 40px;
    width: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.header-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    padding: 8px 20px;
    background: rgba(251, 191, 36, 0.15);
    border-radius: var(--radius-full);
    border: 1px solid rgba(251, 191, 36, 0.25);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.back-to-home {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(251, 191, 36, 0.2);
    backdrop-filter: blur(10px);
    color: rgba(255, 255, 255, 0.95);
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-smooth);
    border: 1px solid rgba(251, 191, 36, 0.35);
}

.back-to-home:hover {
    transform: translateY(-2px);
    background: rgba(251, 191, 36, 0.3);
    border-color: rgba(251, 191, 36, 0.5);
    box-shadow: var(--shadow-glow);
}

.main-container {
    flex: 1;
    padding: 100px 24px 40px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    animation: fadeInUp 0.6s ease-out;
}

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

.pdf-container {
    background: var(--glass-bg);
    backdrop-filter: var(--blur-medium);
    -webkit-backdrop-filter: var(--blur-medium);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: var(--border-glass);
    position: relative;
    overflow: hidden;
}

.pdf-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
}

.pdf-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        rgba(251, 191, 36, 0.6) 0%, 
        rgba(183, 110, 121, 0.6) 50%, 
        rgba(251, 191, 36, 0.6) 100%);
}

.pdf-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    gap: 16px;
}

.pdf-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    gap: 12px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.pdf-title i {
    color: rgba(251, 191, 36, 0.9);
    text-shadow: 0 2px 15px rgba(251, 191, 36, 0.4);
}

.pdf-controls {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.pdf-control-btn {
    padding: 10px 20px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all var(--transition-smooth);
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    box-shadow: var(--shadow-sm);
    outline: none;
}

.pdf-control-btn:hover {
    transform: translateY(-2px);
    background: rgba(251, 191, 36, 0.25);
    color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-glow);
    border-color: rgba(251, 191, 36, 0.4);
}

.pdf-control-btn:focus {
    outline: 2px solid rgba(251, 191, 36, 0.6);
    outline-offset: 2px;
}

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

.pdf-reader {
    position: relative;
    width: 100%;
    min-height: 700px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: rgba(10, 10, 30, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.pdf-toolbar {
    display: flex;
    gap: 12px;
    align-items: center;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.06);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    backdrop-filter: blur(10px);
}

.toolbar-btn {
    padding: 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-body);
    backdrop-filter: blur(10px);
}

.toolbar-btn:hover {
    background: rgba(251, 191, 36, 0.2);
    color: rgba(255, 255, 255, 0.95);
    border-color: rgba(251, 191, 36, 0.3);
}

.toolbar-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.page-info {
    font-family: var(--font-display);
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.85);
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

#pdfViewer {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 24px;
    background: rgba(10, 10, 30, 0.4);
    min-height: 600px;
}

#pdfViewer canvas {
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    max-width: 100%;
    height: auto;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.pdf-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    color: rgba(251, 191, 36, 0.9);
    text-align: center;
    padding: 40px;
    backdrop-filter: blur(10px);
}

.pdf-placeholder i {
    font-size: 4rem;
    margin-bottom: 24px;
    color: rgba(251, 191, 36, 0.9);
    text-shadow: 0 2px 20px rgba(251, 191, 36, 0.4);
    animation: pulse 2s ease-in-out infinite;
}

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

.pdf-placeholder h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.9);
}

.pdf-placeholder p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 32px;
    max-width: 400px;
}

.upload-btn {
    padding: 14px 32px;
    border: 1px solid rgba(251, 191, 36, 0.4);
    border-radius: var(--radius-full);
    background: rgba(251, 191, 36, 0.2);
    backdrop-filter: blur(10px);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-family: var(--font-body);
}

.upload-btn:hover {
    transform: translateY(-3px);
    background: rgba(251, 191, 36, 0.3);
    border-color: rgba(251, 191, 36, 0.6);
    box-shadow: var(--shadow-glow);
}

.file-input {
    display: none;
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 60px;
}

.loading-circle {
    width: 80px;
    height: 80px;
    border: 4px solid rgba(251, 191, 36, 0.2);
    border-top: 4px solid rgba(251, 191, 36, 0.9);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    position: relative;
}

.loading-circle i {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    color: rgba(251, 191, 36, 0.9);
    text-shadow: 0 2px 15px rgba(251, 191, 36, 0.4);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text-container {
    text-align: center;
}

.loading-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin-bottom: 8px;
    color: rgba(255, 255, 255, 0.9);
}

.loading-progress {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

footer {
    text-align: center;
    padding: 40px 24px;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: var(--blur-heavy);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
    margin-top: auto;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
}

footer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        rgba(251, 191, 36, 0.5) 0%, 
        rgba(183, 110, 121, 0.5) 50%, 
        rgba(251, 191, 36, 0.5) 100%);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo img {
    height: 36px;
    width: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-logo h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
    font-weight: 600;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.footer-text {
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-copyright {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(10px);
    padding: 10px 24px;
    border-radius: var(--radius-full);
    display: inline-block;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
    .page-header {
        padding: 0 16px;
        height: auto;
        min-height: 64px;
        flex-wrap: wrap;
        padding: 12px 16px;
        gap: 12px;
    }

    .header-left {
        font-size: 0.95rem;
    }

    .logo-img {
        height: 32px;
    }

    .header-title {
        font-size: 1rem;
        padding: 6px 14px;
    }

    .back-to-home {
        padding: 8px 14px;
        font-size: 0.85rem;
    }

    .main-container {
        padding: 100px 16px 32px;
    }

    .pdf-container {
        padding: 20px;
    }

    .pdf-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .pdf-title {
        font-size: 1.2rem;
    }

    .pdf-controls {
        width: 100%;
        justify-content: flex-start;
    }

    .pdf-toolbar {
        padding: 12px;
        gap: 8px;
    }

    .toolbar-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .page-info {
        font-size: 0.85rem;
    }

    #pdfViewer {
        padding: 16px;
        min-height: 500px;
    }

    .pdf-placeholder i {
        font-size: 3rem;
    }

    .pdf-placeholder h3 {
        font-size: 1.2rem;
    }

    .pdf-placeholder p {
        font-size: 0.9rem;
    }

    .upload-btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

::selection {
    background: rgba(251, 191, 36, 0.3);
    color: var(--amber-900);
}

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

::-webkit-scrollbar-track {
    background: var(--cream);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--amber-400) 0%, var(--bronze-400) 100%);
    border-radius: 4px;
}