@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* GCore/Vercel Dark Theme (Default) */
    --bg-primary: #0a0a0a;
    --bg-secondary: #121212;
    --bg-tertiary: #1a1a1a;
    --border-color: #1f1f1f;
    --border-hover: #2e2e2e;
    --text-primary: #f3f4f6;
    --text-secondary: #a1a1aa;
    --text-muted: #52525b;
    --preview-bg: #050505;
    
    --accent-color: #ff5900;
    --accent-hover: #e04e00;
    --accent-glow: rgba(255, 89, 0, 0.08);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 12px 24px 0 rgba(0, 0, 0, 0.7);
}

[data-theme="light"] {
    /* Premium Minimal Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f4f4f5;
    --border-color: #e4e4e7;
    --border-hover: #d4d4d8;
    --text-primary: #09090b;
    --text-secondary: #71717a;
    --text-muted: #a1a1aa;
    --preview-bg: #fafafa;
    
    --accent-color: #ff5900;
    --accent-hover: #e04e00;
    --accent-glow: rgba(255, 89, 0, 0.04);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 8px 0 rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 8px 16px 0 rgba(0, 0, 0, 0.04);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.2s ease, color 0.2s ease;
    line-height: 1.5;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* Header/Top Navigation */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.85rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
    transition: border-color 0.2s ease;
}

@media (max-width: 640px) {
    .header {
        padding: 0.75rem 1rem;
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.3px;
}

.logo svg {
    color: var(--accent-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

/* Base button layouts */
.btn {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.5rem 1rem;
    transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff;
    border: 1px solid var(--accent-color);
}

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

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

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-hover);
}

.btn-secondary svg {
    width: 14px;
    height: 14px;
    color: var(--text-secondary);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.theme-toggle svg {
    width: 15px;
    height: 15px;
}

.theme-icon-light {
    display: none;
}
[data-theme="light"] .theme-icon-dark {
    display: none;
}
[data-theme="light"] .theme-icon-light {
    display: block;
}

/* Center Layout Grid */
.container {
    flex: 1;
    max-width: 860px;
    width: 100%;
    margin: 4rem auto;
    padding: 0 1.5rem;
    position: relative;
}

@media (max-width: 768px) {
    .container {
        margin: 2rem auto;
        padding: 0 1rem;
    }
}

/* Ambient Background Glow */
.ambient-glow {
    position: absolute;
    width: 500px;
    height: 300px;
    background: radial-gradient(circle, var(--accent-glow) 0%, rgba(255, 89, 0, 0) 70%);
    filter: blur(60px);
    z-index: 0;
    pointer-events: none;
    top: 250px;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Centered File Container Card */
.file-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    position: relative;
    z-index: 1;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.file-card:hover {
    border-color: var(--border-hover);
}

/* Preview Pane */
.preview-pane {
    background-color: var(--preview-bg);
    border-bottom: 1px solid var(--border-color);
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

@media (max-width: 640px) {
    .preview-pane {
        min-height: 280px;
    }
}

/* Video Player Preview */
.video-el {
    width: 100%;
    max-height: 500px;
    display: block;
    background-color: #000000;
}

/* Center Album Audio View */
.audio-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 4.5rem 2rem;
    width: 100%;
    max-width: 460px;
}

.audio-album-art {
    width: 110px;
    height: 110px;
    border-radius: 6px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    box-shadow: var(--shadow-sm);
}

.audio-album-art svg {
    width: 44px;
    height: 44px;
}

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

.audio-native-player audio {
    width: 100%;
    outline: none;
}

/* Image Element */
.image-el {
    max-width: 100%;
    max-height: 460px;
    object-fit: contain;
    padding: 1.5rem;
    cursor: zoom-in;
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.image-el:hover {
    transform: scale(1.015);
}

/* PDF Viewer */
.pdf-el {
    width: 100%;
    height: 540px;
    border: none;
}

/* Generic Fallback Box */
.generic-file-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 5rem 2rem;
    text-align: center;
}

.generic-icon-wrapper {
    width: 72px;
    height: 72px;
    border-radius: 8px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.generic-icon-wrapper svg {
    width: 32px;
    height: 32px;
}

.generic-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    max-width: 320px;
    line-height: 1.45;
}

/* File info section */
.info-section {
    padding: 2.25rem;
}

@media (max-width: 640px) {
    .info-section {
        padding: 1.5rem;
    }
}

.file-title-row {
    margin-bottom: 2rem;
}

.file-name {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.65rem;
    word-break: break-all;
    letter-spacing: -0.4px;
    line-height: 1.25;
}

/* Grid parameters block */
.meta-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 0;
    margin-bottom: 2rem;
}

@media (max-width: 640px) {
    .meta-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

.meta-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.meta-val {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
}

/* Actions Section */
.actions-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.actions-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

@media (max-width: 640px) {
    .actions-row {
        flex-direction: column-reverse;
        align-items: stretch;
    }
    .actions-left {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }
}

/* Footer Details */
.footer {
    text-align: center;
    padding: 3rem 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.2px;
}

/* Toast container */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

@media (max-width: 640px) {
    .toast-container {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }
}

.toast {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: toastIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes toastIn {
    from {
        transform: translateY(8px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.toast-success svg {
    color: var(--accent-color);
}

.toast-info svg {
    color: var(--text-secondary);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
.animate-spin {
    animation: spin 1s linear infinite;
}