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

:root {
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-primary-dark: #0d1b2a;
    --color-secondary: #4a5568;
    --color-accent: #3182ce;
    --color-accent-light: #63b3ed;
    --color-background: #f0f4f8;
    --color-surface: #ffffff;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-border: #e2e8f0;
    --color-success: #38a169;
    --color-error: #e53e3e;
    --color-gold: #d69e2e;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

html {
    font-size: 16px;
    line-height: 1.7;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--color-background) 0%, #e2e8f0 100%);
    color: var(--color-text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Main container */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header styles */
header {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

header * {
    position: relative;
    z-index: 1;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-surface);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--color-accent-light);
    font-style: italic;
    font-weight: 400;
    opacity: 0.95;
}

/* Section styles */
section {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

section:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

section h2 {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 3px solid var(--color-accent);
    display: inline-block;
    position: relative;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 40%;
    height: 3px;
    background: var(--color-gold);
}

/* Video section */
.video-section {
    background: linear-gradient(145deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    padding: var(--spacing-xl);
    border: none;
}

.video-section:hover {
    transform: none;
}

.video-section h2 {
    color: var(--color-surface);
    border-bottom-color: var(--color-accent-light);
}

.video-section h2::after {
    background: var(--color-gold);
}

.video-container {
    position: relative;
    width: 100%;
    background: linear-gradient(180deg, #000 0%, #1a1a2e 100%);
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16 / 9;
    box-shadow: var(--shadow-xl);
    border: 4px solid rgba(255, 255, 255, 0.1);
}

#video-player {
    width: 100%;
    height: 100%;
    display: block;
}

.video-loading,
.video-error {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.85) 0%, rgba(26, 54, 93, 0.9) 100%);
    color: var(--color-surface);
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    text-align: center;
}

.video-error p {
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 400px;
    opacity: 0.9;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--color-accent-light);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

/* Metadata section */
.metadata-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.metadata-item {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-background) 0%, #fff 100%);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-accent);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.metadata-item:hover {
    border-left-color: var(--color-gold);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.metadata-item dt {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
}

.metadata-item dd {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text);
}

/* Manifest section */
.manifest-description {
    margin-bottom: var(--spacing-lg);
    color: var(--color-secondary);
    font-size: 1.05rem;
}

.manifest-description a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.manifest-description a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.manifest-url-container {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

#manifest-url {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.875rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-background);
    color: var(--color-text);
    cursor: text;
    transition: all var(--transition-fast);
}

#manifest-url:hover {
    border-color: var(--color-accent);
}

#manifest-url:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 4px rgba(49, 130, 206, 0.15);
}

#copy-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-primary-light) 100%);
    color: var(--color-surface);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

#copy-btn:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

#copy-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

#copy-btn:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(49, 130, 206, 0.3);
}

.copy-icon {
    font-size: 1.1rem;
}

.copy-feedback {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    animation: fadeIn 0.3s ease;
}

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

.copy-feedback.success {
    background: linear-gradient(135deg, #c6f6d5 0%, #9ae6b4 100%);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.copy-feedback.error {
    background: linear-gradient(135deg, #fed7d7 0%, #feb2b2 100%);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.manifest-actions {
    margin-top: var(--spacing-xl);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-surface);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* About section */
.about-section p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

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

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    margin-top: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-xl);
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
}

footer p {
    margin-bottom: var(--spacing-sm);
}

footer p:last-child {
    margin-bottom: 0;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    header {
        padding: var(--spacing-2xl) var(--spacing-lg);
        border-radius: var(--radius-lg);
    }

    h1 {
        font-size: 1.875rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    section {
        padding: var(--spacing-lg);
        border-radius: var(--radius-md);
    }

    section:hover {
        transform: none;
    }

    .manifest-url-container {
        flex-direction: column;
    }

    #copy-btn {
        justify-content: center;
    }

    .metadata-list {
        grid-template-columns: 1fr;
    }

    .metadata-item:hover {
        transform: none;
    }

    footer {
        border-radius: var(--radius-lg);
        padding: var(--spacing-xl) var(--spacing-md);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }

    section h2 {
        font-size: 1.125rem;
    }

    .video-container {
        border-width: 2px;
    }
}

/* Inline Slideshow */
.slideshow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, #0a0a0a 0%, #1a1a2e 100%);
}

.slideshow.hidden {
    display: none !important;
}

#slideshow-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: opacity 0.5s ease;
}

#slideshow-image.loading {
    opacity: 0.3;
}

.slideshow-message {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.slideshow-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    display: flex;
    justify-content: space-between;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.slideshow:hover .slideshow-overlay {
    opacity: 1;
}

.slideshow-counter {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    font-weight: 500;
    background: rgba(0, 0, 0, 0.5);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
}

.slideshow-controls {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.slideshow-nav,
.slideshow-pause {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.slideshow-nav:hover,
.slideshow-pause:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: scale(1.1);
}

.slideshow-pause {
    font-size: 0.8rem;
    letter-spacing: -2px;
}

.slideshow-pause.paused {
    background: var(--color-gold);
    border-color: var(--color-gold);
    color: var(--color-primary-dark);
}

.slideshow-fullscreen {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: var(--spacing-sm);
}

.slideshow-fullscreen:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    transform: scale(1.1);
}

.slideshow-fullscreen.hidden {
    display: none;
}

/* Fullscreen mode */
.slideshow.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    border-radius: 0;
    background: #000;
}

.slideshow.fullscreen #slideshow-image {
    object-fit: contain;
}

.slideshow.fullscreen .slideshow-overlay {
    opacity: 1;
    padding: var(--spacing-lg) var(--spacing-xl);
}

.slideshow.fullscreen .slideshow-close-fullscreen {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.slideshow.fullscreen .slideshow-close-fullscreen:hover {
    background: var(--color-error);
    border-color: var(--color-error);
    transform: scale(1.1);
}

/* Slideshow responsive */
@media (max-width: 768px) {
    .slideshow-overlay {
        opacity: 1;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .slideshow-nav,
    .slideshow-pause {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .slideshow-counter {
        font-size: 0.8rem;
    }
}

/* Print styles */
@media print {
    body {
        background: white;
    }

    .video-section {
        display: none;
    }

    section {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }

    header, footer {
        background: var(--color-primary);
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }
}