/**
 * =============================================================================
 * ENHANCED CSS STYLESHEET - MOBILE OPTIMIZED
 * =============================================================================
 * Improvements:
 * 1. Fixed mobile layout shift issues
 * 2. Enhanced padding and spacing consistency
 * 3. Better visual hierarchy and modern aesthetics
 * 4. Improved responsive design with fluid layouts
 * 5. Added micro-animations and smooth transitions
 * 6. Enhanced glassmorphism effects
 * =============================================================================
 */

:root {
    /* Primary Brand Colors */
    --primary: #2563EB;
    --primary-dark: #1E40AF;
    --primary-light: #3B82F6;
    --primary-ultra-light: #EFF6FF;

    /* Semantic Colors */
    --success: #16A34A;
    --success-dark: #166534;
    --success-light: #DCFCE7;
    --warning: #EAB308;
    --warning-light: #FEF3C7;
    --error: #DC2626;
    --error-dark: #991B1B;
    --error-light: #FEE2E2;

    /* Background Gradients */
    --bg-page: linear-gradient(135deg, #F8FAFC 0%, #F1F5F9 100%);
    --bg-section: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-card-hover: #F9FAFB;
    --bg-glass: rgba(255, 255, 255, 0.85);
    --bg-glass-hover: rgba(255, 255, 255, 0.95);

    /* Text Colors */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --text-light: #CBD5E1;

    /* Border Colors */
    --border-primary: #E2E8F0;
    --border-hover: #CBD5E1;
    --border-focus: #94A3B8;
    --border-glass: rgba(148, 163, 184, 0.2);

    /* Shadow System */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* Spacing System */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Border Radius System */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Animation Curves */
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/*
 * =========================================
 * Global Styles & Reset
 * =========================================
 */
html {
    box-sizing: border-box;
    scroll-behavior: smooth;
}

*,
*::before,
*::after {
    box-sizing: inherit;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
    overflow-x: hidden;
    min-height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    box-sizing: border-box;
}

/*
 * =========================================
 * Utility & Component Classes
 * =========================================
 */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s var(--ease-smooth);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--border-hover);
}

.glass-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s var(--ease-smooth);
}

.glass-card:hover {
    background: var(--bg-glass-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Enhanced Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    line-height: 1.4;
    border: none;
    cursor: pointer;
    transition: all 0.3s var(--ease-smooth);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    user-select: none;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.6s var(--ease-smooth);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.3);
}

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error), var(--error-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(220, 38, 38, 0.3);
}

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

.btn:disabled::before {
    display: none;
}

/* Icon Button System */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-primary);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s var(--ease-smooth);
    box-shadow: var(--shadow-xs);
}

.btn-icon:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-icon.success {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.btn-icon.error {
    background: var(--error);
    border-color: var(--error);
    color: white;
}

.btn-icon.loading {
    pointer-events: none;
}

/*
 * =========================================
 * Header Section
 * =========================================
 */
.header {
    padding: var(--space-3xl) 0 80px 0;
    text-align: center;
    position: relative;
    width: 100%;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
}

.header-content {
    position: relative;
    z-index: 2;
}

.header h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

.header-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    font-weight: 400;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto var(--space-2xl) auto;
    line-height: 1.5;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    max-width: 900px;
    margin: 0 auto;
}

.stat-card {
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    transition: all 0.3s var(--ease-smooth);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.15);
}

.stat-icon {
    display: block;
    margin-bottom: var(--space-md);
    font-size: 2.75rem;
    color: var(--primary);
}

.stat-title {
    margin-bottom: var(--space-xs);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.4;
}

/*
 * =========================================
 * Main Layout
 * =========================================
 */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
    width: 100%;
    align-items: start;
}

/*
 * =========================================
 * Upload Section
 * =========================================
 */
.upload-section {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    width: 100%;
}

.upload-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl) var(--space-2xl);
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-section);
}

.upload-header h2 {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.upload-area {
    position: relative;
    padding: var(--space-2xl);
    margin: var(--space-2xl);
    border: 3px dashed var(--border-primary);
    border-radius: var(--radius-xl);
    background: var(--bg-section);
    text-align: center;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.4s var(--ease-smooth);
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
    transition: left 0.8s var(--ease-smooth);
}

.upload-area:hover::before,
.upload-area.dragover::before {
    left: 100%;
}

.upload-area:hover,
.upload-area.dragover {
    transform: translateY(-2px);
    border-color: var(--primary);
    background: var(--primary-ultra-light);
    box-shadow: var(--shadow-lg);
}

.upload-icon {
    margin-bottom: var(--space-lg);
    font-size: 4.5rem;
    color: var(--primary);
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

.upload-text {
    margin-bottom: var(--space-sm);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.upload-subtext {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.5;
}

#fileInput {
    display: none;
}

/*
 * =========================================
 * Files Display Section
 * =========================================
 */
.files-container {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    margin-top: var(--space-2xl);
    max-height: 650px;
    overflow-y: auto;
    overflow-x: hidden;
    box-shadow: var(--shadow-lg);
    width: 100%;
    box-sizing: border-box;
}

.files-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-primary);
    position: sticky;
    top: 0;
    background: var(--bg-card);
    z-index: 10;
    backdrop-filter: blur(10px);
}

.files-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 16px;
}

.files-count {
    padding: 6px 12px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: white;
    font-size: 12px;
    font-weight: 600;
    min-width: 24px;
    text-align: center;
}

.file-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-primary);
    transition: all 0.2s var(--ease-smooth);
    width: 100%;
    box-sizing: border-box;
    overflow: hidden;
}

.file-item:last-child {
    border-bottom: none;
}

.file-item:hover {
    background: var(--bg-card-hover);
}

.file-preview {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    min-width: 64px;
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-md);
    display: block;
    object-fit: cover;
    transition: all 0.2s var(--ease-smooth);
}

.file-preview:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.file-info {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.file-name {
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--text-primary);
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.file-meta {
    display: flex;
    gap: var(--space-lg);
    font-size: 13px;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.file-actions {
    display: flex;
    flex-shrink: 0;
    gap: var(--space-sm);
    min-width: fit-content;
}

.progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--border-primary);
    overflow: hidden;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    transition: width 0.3s var(--ease-smooth);
}

/* Empty State */
.empty-state {
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
    color: var(--text-muted);
}

.empty-icon {
    margin-bottom: var(--space-lg);
    font-size: 4.5rem;
    color: var(--text-muted);
    opacity: 0.4;
}

.empty-text {
    margin-bottom: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.empty-subtext {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

/*
 * =========================================
 * Settings Panel
 * =========================================
 */
.settings-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    height: fit-content;
    max-height: calc(100vh - 48px);
    position: sticky;
    top: var(--space-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl) var(--space-lg);
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-section);
}

.panel-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.panel-content {
    padding: var(--space-lg);
    flex-grow: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.form-group {
    margin-bottom: var(--space-xl);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input,
.form-select {
    width: 100%;
    padding: 14px var(--space-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-section);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s var(--ease-smooth);
    box-shadow: var(--shadow-xs);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    background: var(--bg-card);
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    padding: var(--space-sm) 0;
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
    cursor: pointer;
}

.form-checkbox label {
    flex: 1;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1.4;
}

.quality-preview {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-sm);
    padding: var(--space-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    background: var(--bg-section);
}

.quality-label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

.quality-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-primary);
    justify-content: center;
    margin-top: var(--space-lg);
}

/*
 * =========================================
 * Notifications & Components
 * =========================================
 */
.toast {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    color: white;
    font-weight: 500;
    font-size: 14px;
    max-width: 420px;
    z-index: 1000;
    box-shadow: var(--shadow-2xl);
    transform: translateX(120%);
    transition: transform 0.4s var(--ease-bounce);
    backdrop-filter: blur(10px);
}

.toast.show {
    transform: translateX(0);
}

.toast.success { background: var(--success); }
.toast.error { background: var(--error); }
.toast.warning { background: var(--warning); }

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: currentColor;
    animation: spin 1s linear infinite;
}

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

/* Custom Scrollbar */
.files-container::-webkit-scrollbar,
.panel-content::-webkit-scrollbar {
    width: 6px;
}

.files-container::-webkit-scrollbar-track,
.panel-content::-webkit-scrollbar-track {
    background: var(--bg-section);
    border-radius: var(--radius-sm);
}

.files-container::-webkit-scrollbar-thumb,
.panel-content::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: var(--radius-sm);
    transition: background 0.2s var(--ease-smooth);
}

.files-container::-webkit-scrollbar-thumb:hover,
.panel-content::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--ease-smooth) forwards;
}

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

/*
 * =========================================
 * Footer
 * =========================================
 */
.site-footer {
    width: 100%;
    padding: var(--space-2xl) 0;
    text-align: center;
    border-top: 1px solid var(--border-primary);
    color: var(--text-secondary);
    font-size: 14px;
    background: var(--bg-section);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-top: var(--space-md);
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: all 0.3s var(--ease-smooth);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
}

.social-links a:hover {
    color: var(--primary);
    transform: translateY(-3px);
    background: var(--primary-ultra-light);
}

/*
 * =========================================
 * Responsive Design
 * =========================================
 */

/* Large Desktop */
@media (min-width: 1400px) {
    .container {
        padding: 0 var(--space-2xl);
    }
}

/* Desktop */
@media (max-width: 1200px) {
    .main-layout {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .settings-panel {
        position: static;
        height: auto;
        max-height: none;
    }
}

/* Tablet */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-lg);
        max-width: 100%;
    }

    .header {
        padding: var(--space-2xl) 0 var(--space-3xl) 0;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }

    .stat-card {
        padding: var(--space-lg) var(--space-md);
    }

    .stat-icon {
        font-size: 2.25rem;
    }

    .upload-area {
        padding: var(--space-xl) var(--space-lg);
        margin: var(--space-lg);
    }

    .upload-icon {
        font-size: 3.5rem;
    }

    .upload-text {
        font-size: 1.25rem;
    }

    .file-item {
        padding: var(--space-md) var(--space-lg);
        gap: var(--space-md);
    }

    .file-preview {
        width: 56px;
        height: 56px;
        min-width: 56px;
    }

    .file-meta {
        gap: var(--space-md);
        font-size: 12px;
    }

    .file-actions {
        gap: 6px;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }

    .btn-group {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .btn {
        width: 100%;
        justify-content: center;
        padding: 16px var(--space-lg);
        font-size: 15px;
    }

    .files-container {
        max-height: 450px;
    }

    .upload-header {
        padding: var(--space-lg) var(--space-xl);
    }

    .files-header {
        padding: var(--space-md) var(--space-lg);
    }

    .panel-header {
        padding: var(--space-lg);
    }

    .panel-content {
        padding: var(--space-lg);
    }

    .toast {
        top: var(--space-md);
        right: var(--space-md);
        left: var(--space-md);
        max-width: none;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }

    .header {
        padding: var(--space-xl) 0 var(--space-2xl) 0;
    }

    .header-subtitle {
        font-size: 1.125rem;
        margin-bottom: var(--space-xl);
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .stat-card {
        padding: var(--space-md);
    }

    .main-layout {
        gap: var(--space-lg);
    }

    .upload-area {
        padding: var(--space-lg) var(--space-md);
        margin: var(--space-md);
    }

    .upload-icon {
        font-size: 3rem;
        margin-bottom: var(--space-md);
    }

    .upload-text {
        font-size: 1.125rem;
    }

    .upload-subtext {
        font-size: 14px;
    }

    .file-item {
        padding: var(--space-md);
        gap: var(--space-sm);
        flex-wrap: wrap;
    }

    .file-preview {
        width: 48px;
        height: 48px;
        min-width: 48px;
    }

    .file-info {
        flex: 1;
        min-width: 120px;
    }

    .file-name {
        font-size: 14px;
        margin-bottom: 2px;
    }

    .file-meta {
        gap: var(--space-sm);
        font-size: 11px;
        flex-wrap: wrap;
    }

    .file-actions {
        gap: 4px;
        width: 100%;
        justify-content: flex-end;
        flex-basis: 100%;
    }

    .btn-icon {
        width: 32px;
        height: 32px;
        font-size: 13px;
    }

    .files-container {
        max-height: 350px;
        margin-top: var(--space-lg);
    }

    .upload-header,
    .files-header,
    .panel-header {
        padding: var(--space-md) var(--space-lg);
    }

    .upload-header h2,
    .panel-title {
        font-size: 1.125rem;
    }

    .files-title {
        font-size: 15px;
    }

    .panel-content {
        padding: var(--space-md) var(--space-lg);
    }

    .form-group {
        margin-bottom: var(--space-lg);
    }

    .form-input,
    .form-select {
        padding: 12px var(--space-md);
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .btn {
        padding: 14px var(--space-md);
        font-size: 14px;
    }

    .btn-group {
        gap: var(--space-sm);
        margin-top: var(--space-md);
        padding-top: var(--space-md);
    }

    .toast {
        top: var(--space-sm);
        right: var(--space-sm);
        left: var(--space-sm);
        padding: var(--space-sm) var(--space-md);
        font-size: 13px;
    }

    .empty-state {
        padding: var(--space-xl) var(--space-md);
    }

    .empty-icon {
        font-size: 3.5rem;
        margin-bottom: var(--space-md);
    }

    .empty-text {
        font-size: 1.125rem;
    }

    .social-links {
        gap: var(--space-md);
    }

    .social-links a {
        font-size: 1.25rem;
        padding: 6px;
    }
}

/* Extra Small Mobile */
@media (max-width: 360px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .upload-area {
        margin: var(--space-sm);
        padding: var(--space-md);
    }

    .file-item {
        padding: var(--space-sm) var(--space-md);
    }

    .file-preview {
        width: 40px;
        height: 40px;
        min-width: 40px;
    }

    .btn-icon {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }

    .files-header,
    .upload-header,
    .panel-header {
        padding: var(--space-sm) var(--space-md);
    }

    .panel-content {
        padding: var(--space-sm) var(--space-md);
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .file-preview {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .upload-icon {
        animation: none;
    }

    .btn::before {
        display: none;
    }

    .upload-area::before {
        display: none;
    }
}

/* Dark Mode Support (if implemented) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-page: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
        --bg-section: #1E293B;
        --bg-card: #334155;
        --bg-card-hover: #475569;
        --bg-glass: rgba(51, 65, 85, 0.85);
        --bg-glass-hover: rgba(51, 65, 85, 0.95);

        --text-primary: #F8FAFC;
        --text-secondary: #CBD5E1;
        --text-muted: #64748B;
        --text-light: #475569;

        --border-primary: #475569;
        --border-hover: #64748B;
        --border-focus: #94A3B8;
        --border-glass: rgba(100, 116, 139, 0.2);

        --primary-ultra-light: rgba(59, 130, 246, 0.1);
        --success-light: rgba(22, 163, 74, 0.1);
        --warning-light: rgba(234, 179, 8, 0.1);
        --error-light: rgba(220, 38, 38, 0.1);
    }

    .form-input,
    .form-select {
        background: var(--bg-card);
        color: var(--text-primary);
    }

    .form-input:focus,
    .form-select:focus {
        background: var(--bg-card-hover);
    }
}

/* Print Styles */
@media print {
    .header::before,
    .upload-area::before,
    .btn::before {
        display: none !important;
    }

    .settings-panel,
    .btn-group,
    .file-actions,
    .social-links {
        display: none !important;
    }

    .main-layout {
        grid-template-columns: 1fr;
    }

    .files-container {
        max-height: none;
        overflow: visible;
    }
}