/* style.css - 优化版：增强毛玻璃通透感 + 清理冗余 */

:root {
    /* Google MD Colors */
    --md-primary: #1a73e8;
    --md-primary-light: #4285f4;
    --md-primary-dark: #1557b0;
    --md-secondary: #5f6368;
    --md-success: #34a853;
    --md-warning: #f9ab00;
    --md-danger: #d93025;
    
    /* Enhanced Glass Effect - 增强毛玻璃 */
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-bg-dark: rgba(17, 24, 39, 0.75);
    --glass-border: rgba(255, 255, 255, 0.6);
    --glass-border-dark: rgba(255, 255, 255, 0.15);
    --glass-shadow: rgba(0, 0, 0, 0.08);
    
    /* Background */
    --bg: #F5F7FA;
    --bg-gradient-start: #E8ECF1;
    --bg-gradient-end: #F0F4F8;
    
    /* Text */
    --text: #1F2937;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    
    /* Transitions - 优化缓动函数 */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-fast: 0.15s var(--ease-out-expo);
    --transition-base: 0.25s var(--ease-out-expo);
    --transition-slow: 0.4s var(--ease-out-expo);
    
    /* Layout */
    --nav-height: 72px;
    --sidebar-width: 280px;
    --mobile-tabbar-height: 70px;
    
    /* Radius */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
}

[data-theme="dark"] {
    --glass-bg: var(--glass-bg-dark);
    --glass-border: var(--glass-border-dark);
    --glass-shadow: rgba(0, 0, 0, 0.4);
    
    --bg: #0F1115;
    --bg-gradient-start: #0F1115;
    --bg-gradient-end: #1A1D23;
    
    --text: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 50%, var(--bg) 100%);
    background-attachment: fixed;
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -webkit-overflow-scrolling: touch;
}

/* Background Blobs - 增强模糊 */
.liquid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.liquid-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    will-change: transform;
}

.blob-1 {
    width: 700px;
    height: 700px;
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.6), rgba(52, 168, 83, 0.4));
    top: -250px;
    right: -150px;
    animation: float 25s infinite ease-in-out;
}

.blob-2 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, rgba(234, 67, 53, 0.5), rgba(251, 188, 5, 0.4));
    bottom: -200px;
    left: -150px;
    animation: float 20s infinite ease-in-out reverse;
}

.blob-3 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, rgba(251, 188, 5, 0.4), rgba(66, 133, 244, 0.5));
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float 30s infinite ease-in-out;
    opacity: 0.3;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(40px, -40px) scale(1.1); }
    66% { transform: translate(-30px, 30px) scale(0.95); }
}

/* Glass Utility - 增强毛玻璃 */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(24px) saturate(200%);
    -webkit-backdrop-filter: blur(24px) saturate(200%);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-glass);
    border-radius: var(--radius-lg);
}

.glass-strong {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(40px) saturate(220%);
    -webkit-backdrop-filter: blur(40px) saturate(220%);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-xl);
}

[data-theme="dark"] .glass-strong {
    background: rgba(17, 24, 39, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, #4285F4 0%, #EA4335 33%, #FBBC05 66%, #34A853 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 32px);
    max-width: 1400px;
    height: var(--nav-height);
    border-radius: var(--radius-lg);
    z-index: 1000;
    transition: all var(--transition-base);
}

@media (max-width: 768px) {
    .navbar {
        top: 0;
        left: 0;
        right: 0;
        transform: none;
        width: 100%;
        border-radius: 0;
        box-shadow: none;
    }
}

.nav-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-brand {
    font-size: clamp(18px, 4vw, 24px);
    font-weight: 800;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    white-space: nowrap;
}

.sidebar-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: none;
    background: rgba(0, 0, 0, 0.05);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--text);
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background: rgba(0, 0, 0, 0.1);
    transform: scale(1.05);
}

@media (min-width: 1025px) {
    .sidebar-toggle {
        display: flex;
    }
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-icon-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    border: none;
    background: rgba(0, 0, 0, 0.05);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    transition: all var(--transition-fast);
    position: relative;
    font-size: 18px;
}

.nav-icon-btn:hover {
    background: rgba(26, 115, 232, 0.12);
    color: var(--md-primary);
    transform: translateY(-2px);
}

.nav-icon-btn--primary {
    background: var(--md-primary);
    color: white;
}

.nav-icon-btn--primary:hover {
    background: var(--md-primary-dark);
    color: white;
}

.nav-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 8px;
    height: 8px;
    background: var(--md-danger);
    border-radius: 50%;
    border: 2px solid var(--glass-bg);
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: calc(var(--nav-height) + 48px);
    left: 24px;
    width: var(--sidebar-width);
    height: calc(100vh - var(--nav-height) - 72px);
    border-radius: var(--radius-lg);
    z-index: 900;
    transform: translateX(0);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(calc(-100% - 40px));
        top: 0;
        left: 0;
        height: 100vh;
        border-radius: 0;
        z-index: 1001;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .sidebar-toggle {
        display: none !important;
    }
}

.sidebar.collapsed {
    width: 72px;
}

.sidebar.collapsed .sidebar-header {
    padding: 16px 0;
    justify-content: center;
}

.sidebar.collapsed .sidebar-brand {
    display: none;
}

.sidebar.collapsed .sidebar-close {
    display: none;
}

.sidebar.collapsed .sidebar-nav {
    padding: 16px 12px;
    align-items: center;
}

.sidebar.collapsed .sidebar-link {
    padding: 14px;
    justify-content: center;
}

.sidebar.collapsed .sidebar-link span {
    display: none;
}

.sidebar.collapsed .sidebar-link i {
    font-size: 22px;
    width: auto;
}

.sidebar.collapsed .sidebar-footer {
    padding: 16px 0;
}

.sidebar.collapsed .sidebar-stats {
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.sidebar.collapsed .stat-label {
    display: none;
}

.sidebar.collapsed .stat-value {
    font-size: 18px;
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.sidebar-brand {
    font-size: 28px;
    font-weight: 800;
}

.sidebar-close {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: none;
    background: rgba(0, 0, 0, 0.05);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--text);
}

@media (max-width: 1024px) {
    .sidebar-close {
        display: flex;
    }
}

.sidebar-nav {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow-y: auto;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.sidebar-link:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--text);
    transform: translateX(4px);
}

.sidebar-link.active {
    background: rgba(26, 115, 232, 0.12);
    color: var(--md-primary);
}

.sidebar-link i {
    font-size: 20px;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 20px 24px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.sidebar-stats {
    display: flex;
    gap: 16px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--md-primary);
    line-height: 1;
}

.stat-label {
    font-size: 12px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Overlay */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 800;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    pointer-events: none;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* Main Content */
.main-content {
    margin-left: auto;
    margin-right: auto;
    margin-top: calc(var(--nav-height) + 48px);
    padding-bottom: 100px;
    max-width: 900px;
    transition: all var(--transition-base);
}

.sidebar:not(.collapsed) ~ .main-content {
    margin-left: calc(var(--sidebar-width) + 48px);
    margin-right: 24px;
    max-width: none;
}

@media (max-width: 1024px) {
    .main-content {
        margin-left: 24px;
        margin-right: 24px;
        max-width: none;
    }
}

@media (max-width: 768px) {
    .main-content {
        margin-top: calc(var(--nav-height) + 16px);
        margin-left: 16px;
        margin-right: 16px;
    }
}

/* Support Card */
.support-card {
    border-radius: var(--radius-xl);
    padding: 32px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1), rgba(217, 48, 37, 0.05));
}

.support-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.support-card-content {
    display: flex;
    align-items: center;
    gap: 24px;
    position: relative;
    z-index: 1;
}

.support-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #EA4335, #d93025);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    flex-shrink: 0;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(234, 67, 53, 0.4); }
    50% { transform: scale(1.05); box-shadow: 0 0 0 10px rgba(234, 67, 53, 0); }
}

.support-text {
    flex: 1;
}

.support-text h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.support-text p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 16px;
}

.support-progress {
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.progress-percent {
    font-weight: 700;
    color: var(--md-primary);
}

.progress-bar {
    height: 8px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--md-primary), var(--md-primary-light));
    border-radius: 4px;
    transition: width 1s var(--ease-out-expo);
}

.sponsor-avatars {
    display: flex;
    gap: -8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.sponsor-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid white;
    margin-left: -8px;
    background: var(--md-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: 600;
}

.sponsor-avatar:first-child {
    margin-left: 0;
}

.sponsor-more {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: 4px;
}

.support-btn {
    padding: 14px 24px;
    background: var(--md-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
}

.support-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.45);
}

@media (max-width: 768px) {
    .support-card-content {
        flex-direction: column;
        text-align: center;
    }
    
    .support-btn {
        width: 100%;
        justify-content: center;
    }
    
    .sponsor-avatars {
        justify-content: center;
    }
}

/* Alert Card */
.alert-card {
    border-radius: var(--radius-xl);
    padding: 20px 24px;
    margin-bottom: 24px;
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: rgba(217, 48, 37, 0.08);
    border: 1px solid rgba(217, 48, 37, 0.2);
}

.alert-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--md-danger);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.alert-content h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--md-danger);
}

.alert-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Upload Section */
.upload-section {
    margin-bottom: 32px;
}

.section-header {
    margin-bottom: 20px;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.section-desc {
    color: var(--text-secondary);
    font-size: 16px;
}

/* Upload Card */
.upload-card {
    border-radius: var(--radius-xl);
    padding: 40px;
    transition: all var(--transition-fast);
}

.upload-area {
    border: 3px dashed rgba(26, 115, 232, 0.3);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.05), transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.upload-area:hover {
    border-color: var(--md-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-area:hover::before {
    opacity: 1;
}

.upload-area.drag-over {
    border-color: var(--md-primary);
    background: rgba(26, 115, 232, 0.08);
    transform: scale(1.02);
}

.upload-icons {
    margin-bottom: 24px;
    position: relative;
    display: inline-block;
}

.upload-main-icon {
    font-size: 64px;
    color: var(--md-primary);
    opacity: 0.8;
}

.upload-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.upload-desc {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 15px;
}

.upload-btn-primary {
    padding: 14px 32px;
    background: var(--md-primary);
    color: white;
    border: none;
    border-radius: 100px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
}

.upload-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.45);
}

.hidden {
    display: none !important;
}

/* Upload Progress */
.upload-progress {
    margin-top: 32px;
    padding: 24px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: var(--radius-lg);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-weight: 600;
}

.progress-track {
    height: 8px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 20px;
}

.progress-bar-animated {
    height: 100%;
    background: linear-gradient(90deg, var(--md-primary), var(--md-primary-light));
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
    overflow: hidden;
}

.progress-bar-animated::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Upload Results */
.upload-results {
    margin-top: 32px;
    padding: 24px;
    background: rgba(52, 168, 83, 0.08);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(52, 168, 83, 0.2);
}

.results-header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.results-header h4 {
    color: var(--md-success);
    font-size: 18px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.results-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.result-item {
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    animation: slideUp 0.3s ease both;
}

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

.result-file-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.result-thumb {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    border: 1px solid rgba(0,0,0,0.1);
}

.result-meta {
    flex: 1;
    min-width: 0;
}

.result-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.result-size {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.result-links {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    align-items: center;
}

.result-input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.result-input-group label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-input {
    padding: 10px 14px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.8);
    font-family: monospace;
    font-size: 13px;
    color: var(--text);
    width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-copy {
    padding: 10px 16px;
    background: var(--md-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-copy:hover {
    background: var(--md-primary-dark);
    transform: translateY(-1px);
}

/* Features Section */
.features-section {
    margin-top: 40px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    border-radius: var(--radius-xl);
    padding: 24px;
    text-align: center;
    transition: all var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 24px;
    color: white;
}

.feature-icon.blue { background: linear-gradient(135deg, #4285F4, #1a73e8); }
.feature-icon.green { background: linear-gradient(135deg, #34A853, #188038); }
.feature-icon.yellow { background: linear-gradient(135deg, #FBBC05, #f9ab00); color: #1F2937; }
.feature-icon.red { background: linear-gradient(135deg, #EA4335, #d93025); }

.feature-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile Tabbar - 优化切换动效 */
.mobile-tabbar {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 32px);
    max-width: 400px;
    height: var(--mobile-tabbar-height);
    border-radius: 100px;
    z-index: 1000;
    display: none;
    padding: 8px;
    will-change: transform;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

@media (max-width: 768px) {
    .mobile-tabbar {
        display: flex;
    }
}

.tab-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 100px;
    transition: all 0.2s var(--ease-spring);
    padding: 8px;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    pointer-events: auto;
    position: relative;
    overflow: hidden;
}

.tab-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--md-primary);
    border-radius: 100px;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.25s var(--ease-spring);
}

.tab-item i {
    font-size: 22px;
    position: relative;
    z-index: 1;
    transition: transform 0.2s var(--ease-spring);
}

.tab-item span {
    font-size: 12px;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

.tab-item.active {
    color: var(--md-primary);
}

.tab-item.active::before {
    opacity: 0.12;
    transform: scale(1);
}

.tab-item.active i {
    transform: translateY(-2px);
}

/* Float Ball */
.float-ball {
    position: fixed;
    bottom: 100px;
    right: 24px;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, #EA4335, #d93025);
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 8px 32px rgba(217, 48, 37, 0.4);
    z-index: 900;
    transition: all var(--transition-fast);
    animation: float-ball-pulse 2s infinite;
    opacity: 0;
    transform: scale(0);
    pointer-events: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

.float-ball.visible {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

@keyframes float-ball-pulse {
    0%, 100% { box-shadow: 0 8px 32px rgba(217, 48, 37, 0.4); }
    50% { box-shadow: 0 12px 40px rgba(217, 48, 37, 0.6); }
}

.float-ball:hover {
    transform: scale(1.1);
}

.float-ball i {
    font-size: 20px;
    margin-bottom: 2px;
}

.float-ball-text {
    font-size: 10px;
    font-weight: 600;
}

@media (max-width: 768px) {
    .float-ball {
        bottom: 90px;
        right: 16px;
        width: 56px;
        height: 56px;
    }
    
    .float-ball-text {
        font-size: 9px;
    }
}

/* Modal - 增强毛玻璃 */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 600px;
    max-height: 85vh;
    border-radius: var(--radius-xl);
    overflow: hidden;
    transform: translateY(30px) scale(0.95);
    transition: all var(--transition-slow);
    display: flex;
    flex-direction: column;
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
}

.modal-close {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: none;
    background: rgba(0, 0, 0, 0.05);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text);
    transform: rotate(90deg);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.btn-primary {
    padding: 12px 24px;
    background: var(--md-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.45);
}

.btn-secondary {
    padding: 12px 24px;
    background: rgba(0, 0, 0, 0.05);
    color: var(--text);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.1);
}

/* Simple Modal */
.simple-modal {
    max-width: 400px;
    padding: 40px;
    text-align: center;
    transform: translateY(30px) scale(0.95);
    transition: all var(--transition-slow);
    border-radius: var(--radius-xl);
}

.modal-overlay.active .simple-modal {
    transform: translateY(0) scale(1);
}

.simple-modal-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background: rgba(52, 168, 83, 0.12);
    color: var(--md-success);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
}

.simple-modal-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.simple-modal-message {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

/* Support Modal */
.support-modal-wide {
    max-width: 640px;
}

.support-modal-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.support-qrcode-section {
    text-align: center;
    padding: 32px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 24px;
}

.qrcode-container {
    width: 180px;
    height: 180px;
    margin: 0 auto 16px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.1);
    padding: 8px;
    background: white;
    position: relative;
}

.qrcode-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qrcode-fallback {
    position: absolute;
    inset: 8px;
}

.qrcode-desc {
    color: var(--text-secondary);
    font-size: 14px;
}

.monthly-sponsors-merged {
    padding: 28px;
    background: rgba(251, 188, 5, 0.08);
    border-radius: 24px;
    border: 1px solid rgba(251, 188, 5, 0.2);
}

.sponsors-header-merged {
    margin-bottom: 16px;
}

.sponsors-title-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
}

.sponsors-title-left {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    flex: 1;
}

.sponsors-title-left i {
    font-size: 24px;
    color: #FBBC05;
    margin-top: 2px;
    flex-shrink: 0;
}

.sponsors-title-left strong {
    display: block;
    margin-bottom: 4px;
    color: var(--text);
    font-size: 16px;
}

.sponsors-title-left p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

.view-full-list {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: rgba(26, 115, 232, 0.1);
    color: var(--md-primary);
    border-radius: 100px;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
    flex-shrink: 0;
    white-space: nowrap;
}

.view-full-list:hover {
    background: var(--md-primary);
    color: white;
    transform: translateY(-1px);
}

.view-full-list i {
    font-size: 12px;
}

.server-cost-progress {
    margin: 16px 0;
    padding: 16px;
    background: rgba(26, 115, 232, 0.06);
    border-radius: 16px;
    border: 1px solid rgba(26, 115, 232, 0.1);
}

.cost-progress-bar {
    height: 10px;
    background: rgba(0,0,0,0.1);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 12px;
}

.cost-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--md-primary), var(--md-primary-light));
    border-radius: 5px;
    width: 0%;
    transition: width 1s ease;
}

.cost-hint {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

.cost-hint span {
    color: var(--md-primary);
    font-weight: 700;
}

.sponsors-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
}

.sponsor-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: white;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border: 1px solid rgba(0,0,0,0.05);
    transition: transform 0.2s ease;
}

.sponsor-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.sponsor-tag i {
    color: #FBBC05;
}

.upload-limit-card {
    padding: 28px;
    background: rgba(26, 115, 232, 0.06);
    border-radius: 24px;
    border: 1px solid rgba(26, 115, 232, 0.15);
}

.upload-limit-card.reached {
    background: rgba(52, 168, 83, 0.08);
    border-color: rgba(52, 168, 83, 0.3);
}

.upload-limit-card.reached .limit-header i {
    color: var(--md-success);
}

.upload-limit-card.reached .limit-value {
    color: var(--md-success);
}

.limit-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    font-weight: 700;
    color: var(--text);
    font-size: 16px;
}

.limit-header i {
    color: var(--md-primary);
    font-size: 20px;
}

.limit-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.current-limit {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.limit-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.limit-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--md-primary);
}

.limit-progress-info {
    font-size: 13px;
    color: var(--text-secondary);
}

.limit-progress-info strong {
    color: var(--md-primary);
    font-weight: 700;
}

.limit-progress-bar {
    height: 8px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.limit-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--md-primary), var(--md-primary-light));
    border-radius: 4px;
    transition: width 1s ease;
}

.upload-limit-card.reached .limit-progress-fill {
    background: linear-gradient(90deg, var(--md-success), #34a853);
}

.qq-group-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 28px;
    background: rgba(18, 183, 245, 0.08);
    border-radius: 24px;
    border: 1px solid rgba(18, 183, 245, 0.2);
}

.qq-group-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.qq-group-info i {
    font-size: 24px;
    color: #12B7F5;
}

.qq-group-info strong {
    display: block;
    margin-bottom: 2px;
    color: var(--text);
    font-size: 15px;
}

.qq-group-info p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

.qq-group-number {
    padding: 10px 16px;
    background: white;
    border-radius: var(--radius-md);
    font-weight: 700;
    color: var(--md-primary);
    border: 1px solid rgba(0, 0, 0, 0.1);
    font-family: monospace;
    font-size: 16px;
}

/* Announcement Content */
.announcement-content {
    line-height: 1.8;
    color: var(--text-secondary);
}

.announcement-content ul {
    margin: 16px 0;
    padding-left: 24px;
}

.announcement-content li {
    margin-bottom: 8px;
}

.announcement-highlight {
    padding: 16px;
    background: rgba(26, 115, 232, 0.08);
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
    color: var(--text);
    font-weight: 600;
}

.announcement-warning {
    display: flex;
    gap: 12px;
    padding: 16px;
    background: rgba(217, 48, 37, 0.08);
    border-radius: var(--radius-lg);
    margin: 16px 0;
    align-items: flex-start;
}

.announcement-warning i {
    color: var(--md-danger);
    font-size: 20px;
    margin-top: 2px;
}

.announcement-footer {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    font-style: italic;
    text-align: center;
}

/* Page Enter Animations */
.page-enter-element {
    opacity: 0;
    transform: translateY(20px);
    animation: pageEnter 0.5s var(--ease-out-expo) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

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

/* Files Section */
.files-header {
    border-radius: var(--radius-xl);
    padding: 28px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.files-title-section {
    flex: 1;
}

.files-stats {
    display: flex;
    gap: 16px;
}

.files-stat-item {
    text-align: right;
}

.files-stat-value {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: var(--md-primary);
}

.files-stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.files-toolbar {
    border-radius: var(--radius-xl);
    padding: 20px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.toolbar-left {
    display: flex;
    gap: 12px;
    align-items: center;
    flex: 1;
    min-width: 280px;
}

.search-box {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.search-box i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-size: 16px;
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 42px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: var(--radius-md);
    background: rgba(255,255,255,0.6);
    font-size: 14px;
    color: var(--text);
    transition: all 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--md-primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.custom-select-wrapper {
    position: relative;
    z-index: 99999;
}

.custom-select {
    position: relative;
    width: 160px;
    z-index: 99999;
}

.select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    color: var(--text);
    transition: all 0.2s;
}

.select-trigger:hover {
    background: white;
    border-color: var(--md-primary);
}

.select-trigger i {
    font-size: 12px;
    transition: transform 0.2s;
}

.custom-select.active .select-trigger i {
    transform: rotate(180deg);
}

.select-options {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    z-index: 99999;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
}

.custom-select.active .select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.select-options .option {
    padding: 12px 16px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text);
    transition: all 0.2s;
}

.select-options .option:hover {
    background: rgba(26, 115, 232, 0.08);
}

.select-options .option.active {
    background: rgba(26, 115, 232, 0.12);
    color: var(--md-primary);
    font-weight: 600;
}

.toolbar-right {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.custom-filter-buttons {
    display: flex;
    gap: 4px;
    background: rgba(0, 0, 0, 0.05);
    padding: 4px;
    border-radius: var(--radius-md);
    flex-wrap: wrap;
}

.custom-filter-buttons .filter-btn {
    position: relative;
    padding: 8px 16px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s ease;
    z-index: 2;
}

.custom-filter-buttons .filter-btn.active {
    color: var(--md-primary);
}

.custom-filter-buttons::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 4px;
    height: calc(100% - 8px);
    background: white;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
}

.batch-actions {
    display: flex;
    gap: 8px;
}

.toolbar-btn {
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius-md);
    background: rgba(0,0,0,0.05);
    color: var(--text);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.toolbar-btn:hover {
    background: rgba(0,0,0,0.1);
}

.toolbar-btn.danger.custom-delete-btn {
    background: rgba(217, 48, 37, 0.1);
    color: var(--md-danger);
    border: 1px solid rgba(217, 48, 37, 0.2);
}

.toolbar-btn.danger.custom-delete-btn:hover {
    background: var(--md-danger);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(217, 48, 37, 0.3);
}

.files-list-container {
    border-radius: var(--radius-xl);
    padding: 24px;
    min-height: 400px;
}

.files-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: rgba(255,255,255,0.5);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    transition: all 0.2s;
    cursor: pointer;
}

.file-item:hover {
    background: rgba(255,255,255,0.8);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.file-item.selected {
    border-color: var(--md-primary);
    background: rgba(26,115,232,0.08);
}

.file-checkbox {
    flex-shrink: 0;
}

.file-checkbox input {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--md-primary);
}

.file-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    font-size: 20px;
    color: var(--text-secondary);
}

.file-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.file-name {
    font-weight: 600;
    font-size: 15px;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.file-meta {
    display: flex;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

.file-ext {
    padding: 2px 8px;
    background: rgba(26, 115, 232, 0.1);
    color: var(--md-primary);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
}

.file-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.file-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-sm);
    background: rgba(0,0,0,0.05);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    font-size: 14px;
}

.file-btn:hover {
    background: var(--md-primary);
    color: white;
    transform: translateY(-2px);
}

.file-btn.delete:hover {
    background: var(--md-danger);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
}

/* File Action Modal */
.file-action-modal {
    max-width: 500px;
}

.link-modal-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.link-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.link-input-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.link-input-group label i {
    color: var(--md-primary);
    font-size: 16px;
}

.link-input-wrapper {
    display: flex;
    gap: 8px;
    align-items: center;
}

.link-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.8);
    font-family: monospace;
    font-size: 14px;
    color: var(--text);
}

.btn-copy-link {
    padding: 12px 16px;
    background: var(--md-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.btn-copy-link:hover {
    background: var(--md-primary-dark);
    transform: translateY(-1px);
}

.link-tips {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 12px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: var(--radius-sm);
}

.qr-modal-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.qr-section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.qr-section-title i {
    color: var(--md-primary);
}

.qr-display {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    padding: 12px;
}

.qr-display img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qr-desc {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
    margin: 0;
}

.qr-divider {
    height: 1px;
    background: rgba(0, 0, 0, 0.1);
    margin: 8px 0;
}

.btn-advanced {
    background: linear-gradient(135deg, #9334e6, #6b1fa8) !important;
}

.btn-advanced:hover {
    background: linear-gradient(135deg, #7c2bc7, #5a189a) !important;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(147, 52, 230, 0.4);
}

/* Delete Modal */
.delete-modal {
    max-width: 400px;
}

.delete-modal .delete-icon {
    background: rgba(217, 48, 37, 0.12);
    color: var(--md-danger);
}

.delete-modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 24px;
}

.btn-danger {
    padding: 12px 24px;
    background: var(--md-danger);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(217, 48, 37, 0.35);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(217, 48, 37, 0.45);
}

/* About Section */
.about-hero {
    border-radius: var(--radius-xl);
    padding: 48px;
    margin-bottom: 24px;
    text-align: center;
}

.about-brand {
    max-width: 600px;
    margin: 0 auto;
}

.about-logo {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
}

.about-tagline {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.about-version {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.version-badge {
    padding: 6px 14px;
    background: var(--md-primary);
    color: white;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
}

.version-date {
    font-size: 14px;
    color: var(--text-secondary);
}

.about-features {
    border-radius: var(--radius-xl);
    padding: 32px;
    margin-bottom: 24px;
}

.about-section-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-section-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--md-primary);
    border-radius: 2px;
}

.feature-details-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-detail-card {
    padding: 24px;
    background: rgba(255,255,255,0.5);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
    cursor: pointer;
}

.feature-detail-card:hover {
    background: rgba(255,255,255,0.9);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-detail-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 24px;
    color: white;
}

.feature-detail-icon.blue { background: linear-gradient(135deg, #4285F4, #1a73e8); }
.feature-detail-icon.green { background: linear-gradient(135deg, #34A853, #188038); }
.feature-detail-icon.purple { background: linear-gradient(135deg, #9334e6, #6b1fa8); }
.feature-detail-icon.orange { background: linear-gradient(135deg, #FBBC05, #f9ab00); color: #1F2937; }
.feature-detail-icon.red { background: linear-gradient(135deg, #EA4335, #d93025); }
.feature-detail-icon.cyan { background: linear-gradient(135deg, #00bcd4, #0097a7); }

.feature-detail-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.feature-detail-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.about-stats {
    border-radius: var(--radius-xl);
    padding: 32px;
    margin-bottom: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    text-align: center;
    padding: 28px;
    background: rgba(255,255,255,0.5);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
    background: rgba(255,255,255,0.8);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: rgba(26,115,232,0.1);
    color: var(--md-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 24px;
}

.stat-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.about-contact {
    border-radius: var(--radius-xl);
    padding: 32px;
    margin-bottom: 24px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px;
    background: rgba(255,255,255,0.5);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s;
}

.contact-card:hover {
    background: rgba(255,255,255,0.9);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 28px;
    color: white;
}

.contact-icon.qq { background: linear-gradient(135deg, #12B7F5, #0a8bc2); }
.contact-icon.wechat { background: linear-gradient(135deg, #07C160, #05a350); }

.contact-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.contact-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.contact-info {
    padding: 8px 16px;
    background: rgba(0,0,0,0.05);
    border-radius: var(--radius-md);
    font-family: monospace;
    font-size: 15px;
    color: var(--md-primary);
    font-weight: 600;
}

.copy-wechat-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(7, 193, 96, 0.1);
    color: #07c160;
    border: 1px solid rgba(7, 193, 96, 0.2);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 8px;
}

.copy-wechat-btn:hover {
    background: #07c160;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(7, 193, 96, 0.3);
}

.about-footer {
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.copyright {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* Upload Limit Info */
.upload-limit-info {
    margin-top: 16px;
    padding: 16px;
    background: rgba(26, 115, 232, 0.08);
    border-radius: 16px;
    border: 1px solid rgba(26, 115, 232, 0.15);
    transition: all 0.3s ease;
}

.upload-limit-info.reached {
    background: rgba(52, 168, 83, 0.08);
    border-color: rgba(52, 168, 83, 0.3);
}

.limit-status {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
    font-size: 14px;
    color: var(--text);
    line-height: 1.4;
}

.limit-status i {
    color: var(--md-primary);
    font-size: 18px;
}

.limit-current {
    color: var(--md-primary);
    font-weight: 700;
    font-size: 16px;
}

.limit-hint {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.4;
}

.limit-hint .limit-next {
    color: var(--md-primary);
    font-weight: 700;
}

/* Progress Files */
.progress-files {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: rgba(255,255,255,0.5);
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.progress-file-item i {
    color: var(--md-primary);
}

.progress-file-item .filename {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.progress-file-item .status {
    font-size: 12px;
    color: var(--text-secondary);
}

.progress-file-item .status.success {
    color: var(--md-success);
}

.progress-file-item .status.error {
    color: var(--md-danger);
}

/* ===== 响应式适配 ===== */
@media (max-width: 1024px) {
    .feature-details-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .sidebar.collapsed ~ .main-content {
        margin-left: 24px;
    }
}

@media (max-width: 768px) {
    .files-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .files-stats {
        width: 100%;
        justify-content: space-between;
    }
    
    .files-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-left {
        flex-direction: column;
        width: 100%;
    }
    
    .search-box {
        max-width: none;
    }
    
    .toolbar-right {
        flex-direction: column;
        width: 100%;
    }
    
    .custom-filter-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .batch-actions {
        width: 100%;
        justify-content: center;
    }
    
    .file-item {
        flex-wrap: wrap;
    }
    
    .file-actions {
        width: 100%;
        justify-content: flex-end;
        margin-top: 8px;
        padding-top: 12px;
        border-top: 1px solid rgba(0,0,0,0.05);
    }
    
    .feature-details-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .about-hero {
        padding: 32px 24px;
    }
    
    .about-logo {
        font-size: 28px;
    }
    
    .nav-brand {
        font-size: clamp(16px, 3.5vw, 20px);
        max-width: calc(100vw - 160px);
    }
    
    .sponsors-title-row {
        flex-direction: column;
        gap: 12px;
    }
    
    .view-full-list {
        width: 100%;
        justify-content: center;
    }
    
    .monthly-sponsors-merged,
    .upload-limit-card,
    .qq-group-section {
        padding: 20px;
        border-radius: 16px;
    }
    
    .support-modal-content {
        gap: 24px;
    }
    
    .qr-display {
        width: 160px;
        height: 160px;
    }
    
    .link-input-wrapper {
        flex-direction: column;
    }
    
    .btn-copy-link {
        width: 100%;
        justify-content: center;
    }
    
    .upload-card {
        padding: 24px;
    }
    
    .upload-area {
        padding: 40px 24px;
    }
    
    .upload-title {
        font-size: 18px;
    }
    
    .alert-card {
        flex-direction: column;
        text-align: center;
    }
    
    .modal {
        max-height: 90vh;
        margin: 0 10px;
        border-radius: var(--radius-lg);
    }
    
    .simple-modal {
        padding: 32px 24px;
        margin: 0 16px;
    }
    
    .qq-group-section {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .result-links {
        grid-template-columns: 1fr;
    }
    
    .btn-copy {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .file-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .file-name {
        font-size: 14px;
    }
    
    .file-meta {
        font-size: 12px;
    }
    
    .file-btn {
        width: 32px;
        height: 32px;
        font-size: 12px;
    }
    
    .nav-brand {
        font-size: 14px;
    }
    
    .nav-brand-text {
        max-width: 80px;
    }
    
    .support-card {
        padding: 20px;
    }
    
    .support-card-content {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
    
    .support-icon {
        width: 56px;
        height: 56px;
        font-size: 24px;
    }
    
    .support-text h3 {
        font-size: 18px;
    }
    
    .support-text p {
        font-size: 13px;
    }
    
    .upload-limit-info {
        padding: 10px;
    }
    
    .limit-status {
        font-size: 12px;
        justify-content: center;
    }
    
    .limit-hint {
        font-size: 11px;
    }
    
    .support-btn {
        width: 100%;
        justify-content: center;
        padding: 12px 20px;
    }
    
    .upload-main-icon {
        font-size: 48px;
    }
}

/* ===== 移动端优化 ===== */
@media (max-width: 768px) {
    .support-progress {
        display: block !important;
    }
    
    .upload-limit-info {
        margin-top: 12px;
        padding: 12px;
    }
    
    .limit-status {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 13px;
    }
    
    .limit-status i {
        font-size: 16px;
    }
    
    .limit-current {
        font-size: 14px;
    }
    
    .limit-hint {
        font-size: 12px;
    }
    
    .progress-bar {
        height: 6px;
        margin: 8px 0;
    }
    
    .progress-fill {
        border-radius: 3px;
    }
    
    .progress-info {
        font-size: 12px;
        margin-bottom: 6px;
    }
    
    .sponsor-avatars {
        margin-top: 10px;
    }
    
    .sponsor-avatar {
        width: 28px;
        height: 28px;
        font-size: 11px;
        margin-left: -6px;
    }
    
    .sponsor-more {
        width: 28px;
        height: 28px;
        font-size: 11px;
    }
}

/* ===== Dark Mode ===== */
[data-theme="dark"] .qq-group-number,
[data-theme="dark"] .sponsor-tag {
    background: #202124;
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .qrcode-container {
    background: white;
}

[data-theme="dark"] .support-highlight,
[data-theme="dark"] .qq-group-section,
[data-theme="dark"] .monthly-sponsors-merged {
    background: rgba(138, 180, 248, 0.08);
}

[data-theme="dark"] .result-item {
    background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .result-input {
    background: rgba(0, 0, 0, 0.3);
    color: white;
    border-color: rgba(255,255,255,0.1);
}

[data-theme="dark"] .file-item {
    background: rgba(255,255,255,0.1);
}

[data-theme="dark"] .file-item:hover {
    background: rgba(255,255,255,0.15);
}

[data-theme="dark"] .feature-detail-card,
[data-theme="dark"] .stat-card,
[data-theme="dark"] .contact-card {
    background: rgba(255,255,255,0.1);
}

[data-theme="dark"] .feature-detail-card:hover,
[data-theme="dark"] .stat-card:hover,
[data-theme="dark"] .contact-card:hover {
    background: rgba(255,255,255,0.15);
}

[data-theme="dark"] .search-box input,
[data-theme="dark"] .select-trigger {
    background: rgba(0,0,0,0.3);
    border-color: rgba(255,255,255,0.1);
    color: white;
}

[data-theme="dark"] .tech-tag {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.1);
    color: white;
}

[data-theme="dark"] .select-options {
    background: #202124;
    border-color: rgba(255,255,255,0.1);
}

[data-theme="dark"] .select-options .option:hover {
    background: rgba(138, 180, 248, 0.1);
}

[data-theme="dark"] .select-options .option.active {
    background: rgba(138, 180, 248, 0.15);
    color: #8ab4f8;
}

[data-theme="dark"] .custom-filter-buttons::before {
    background: rgba(255,255,255,0.1);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

[data-theme="dark"] .custom-filter-buttons .filter-btn.active {
    color: #8ab4f8;
}

[data-theme="dark"] .link-input {
    background: rgba(0,0,0,0.3);
    border-color: rgba(255,255,255,0.1);
    color: white;
}

[data-theme="dark"] .upload-limit-info {
    background: rgba(138, 180, 248, 0.08);
    border-color: rgba(138, 180, 248, 0.2);
}

[data-theme="dark"] .upload-limit-card {
    background: rgba(138, 180, 248, 0.06);
    border-color: rgba(138, 180, 248, 0.15);
}

[data-theme="dark"] .copy-wechat-btn {
    background: rgba(7, 193, 96, 0.15);
    color: #34d17b;
    border-color: rgba(7, 193, 96, 0.3);
}

[data-theme="dark"] .copy-wechat-btn:hover {
    background: #07c160;
    color: white;
}

[data-theme="dark"] .monthly-sponsors-merged {
    background: rgba(251, 188, 5, 0.05);
}

[data-theme="dark"] .server-cost-progress {
    background: rgba(138, 180, 248, 0.08);
}

[data-theme="dark"] .view-full-list {
    background: rgba(138, 180, 248, 0.15);
    color: #8ab4f8;
}

[data-theme="dark"] .view-full-list:hover {
    background: #8ab4f8;
    color: #202124;
}

[data-theme="dark"] .qr-display {
    background: white;
}

[data-theme="dark"] .wechat-qr-container {
    background: white;
}