/* ============================================
   Tailwind CSS CDN
   ============================================ */
@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

/* ============================================
   CSS Design Tokens
   ============================================ */
:root {
    /* Primary palette - Sky Blue (天蓝色) */
    --primary-1: #0EA5E9;
    --primary-2: #38BDF8;
    --primary-3: #7DD3FC;
    --primary-gradient: linear-gradient(135deg, #0EA5E9 0%, #38BDF8 50%, #7DD3FC 100%);

    /* Background layers - Light Theme */
    --bg-deep: #FFFFFF;
    --bg-mid: #F8FAFC;
    --bg-light: #F1F5F9;
    --bg-gradient: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);

    /* Text */
    --text-bright: #0F172A;
    --text-mid: #334155;
    --text-dim: #64748B;

    /* Functional */
    --success: #059669;
    --danger: #DC2626;
    --warning: #D97706;

    /* Glassmorphism - Light */
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(14, 165, 233, 0.12);
    --glass-blur: blur(12px);
    --glass-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);

    /* Card */
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-border: rgba(15, 23, 42, 0.08);
    --card-radius: 16px;

    /* Borders */
    --border-color: rgba(15, 23, 42, 0.08);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Base Styles
   ============================================ */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-bright);
    margin: 0;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: #F1F5F9;
}
::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-1), var(--primary-2));
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-2), var(--primary-3));
}

/* ============================================
   Glassmorphism Card
   ============================================ */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--card-border);
    border-radius: var(--card-radius);
    box-shadow: var(--glass-shadow);
    transition: var(--transition);
}
.glass-card:hover {
    border-color: rgba(14, 165, 233, 0.2);
    box-shadow: 0 8px 30px rgba(14, 165, 233, 0.1);
}

/* ============================================
   Top Banner - Surge Alert
   ============================================ */
.api-down-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    background: linear-gradient(90deg, rgba(220, 38, 38, 0.1), rgba(217, 119, 6, 0.1));
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid rgba(220, 38, 38, 0.2);
    color: #DC2626;
    font-size: 14px;
    font-weight: 500;
    animation: pulse-glow 2.5s ease-in-out infinite;
}
.api-down-banner span { max-width: 1100px; line-height: 1.5; }
@keyframes pulse-glow {
    0%, 100% { box-shadow: inset 0 -1px 0 rgba(239, 68, 68, 0.35); }
    50% { box-shadow: inset 0 -1px 0 rgba(239, 68, 68, 0.35), 0 0 24px rgba(239, 68, 68, 0.25); }
}
.surge-banner {
    background: linear-gradient(90deg, rgba(14, 165, 233, 0.08), rgba(56, 189, 248, 0.08), rgba(125, 211, 252, 0.08));
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid rgba(14, 165, 233, 0.15);
    overflow: hidden;
    position: relative;
}
.surge-banner-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    white-space: nowrap;
    animation: scroll-left 40s linear infinite;
}
@keyframes scroll-left {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}
.surge-banner:hover .surge-banner-inner {
    animation-play-state: paused;
}
.surge-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--primary-1), var(--primary-2));
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}
.surge-tag:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
}
.surge-rate {
    color: #FFD700;
    font-size: 12px;
    font-weight: 700;
}

/* ============================================
   Navigation
   ============================================ */
.nav-tab {
    padding: 8px 18px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    border: 1px solid transparent;
    background: transparent;
}
.nav-tab:hover {
    color: var(--primary-1);
    background: rgba(14, 165, 233, 0.08);
    border-color: rgba(14, 165, 233, 0.2);
}
.nav-tab.active {
    color: white;
    background: var(--primary-gradient);
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
}

/* ============================================
   Stat Cards
   ============================================ */
.stat-card {
    padding: 20px;
    position: relative;
    overflow: hidden;
}
.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--primary-gradient);
}
.stat-value {
    font-size: 32px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}
.stat-label {
    font-size: 13px;
    color: var(--text-dim);
    margin-top: 4px;
}

/* ============================================
   Buttons
   ============================================ */
.btn-primary {
    padding: 10px 24px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.35);
}
.btn-primary:active {
    transform: translateY(0);
}
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}
.btn-ghost {
    padding: 10px 20px;
    background: rgba(14, 165, 233, 0.06);
    color: var(--primary-1);
    border: 1px solid rgba(14, 165, 233, 0.2);
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}
.btn-ghost:hover {
    background: rgba(14, 165, 233, 0.12);
    border-color: var(--primary-1);
}
.btn-icon {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition);
    font-size: 15px;
}
.btn-icon:hover {
    color: var(--primary-1);
    border-color: var(--primary-1);
    background: rgba(14, 165, 233, 0.1);
}
.btn-icon.danger:hover {
    color: var(--danger);
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}
.btn-icon.success:hover {
    color: var(--success);
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

/* ============================================
   Inputs
   ============================================ */
.input-field {
    width: 100%;
    padding: 12px 16px;
    background: #FFFFFF;
    border: 1px solid rgba(15, 23, 42, 0.12);
    border-radius: 10px;
    color: var(--text-bright);
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}
.input-field::placeholder {
    color: var(--text-dim);
}
.input-field:focus {
    border-color: var(--primary-1);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
    background: #FFFFFF;
}
select.input-field {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}
textarea.input-field {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

/* ============================================
   Tables
   ============================================ */
.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 13px;
}
.data-table thead th {
    text-align: left;
    padding: 12px 16px;
    color: var(--text-dim);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
    background: #F8FAFC;
    position: sticky;
    top: 0;
    z-index: 1;
}
.data-table tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(15, 23, 42, 0.05);
    color: var(--text-mid);
}
.data-table tbody tr {
    transition: var(--transition);
}
.data-table tbody tr:hover {
    background: rgba(14, 165, 233, 0.04);
}

/* Rank badges */
.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 13px;
}
.rank-badge.top1 { background: linear-gradient(135deg, #F59E0B, #F97316); color: white; }
.rank-badge.top2 { background: linear-gradient(135deg, #94A3B8, #64748B); color: white; }
.rank-badge.top3 { background: linear-gradient(135deg, #B45309, #92400E); color: white; }
.rank-badge.other { background: rgba(148, 163, 184, 0.1); color: var(--text-dim); }

/* Change indicators */
.change-up { color: var(--success); font-weight: 600; }
.change-down { color: var(--danger); font-weight: 600; }

/* ============================================
   Status Tags
   ============================================ */
.status-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}
.status-pending { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.status-published { background: rgba(125, 211, 252, 0.15); color: var(--primary-3); }
.status-active { background: rgba(16, 185, 129, 0.15); color: var(--success); }

/* ============================================
   Loading & States
   ============================================ */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(14, 165, 233, 0.2);
    border-top-color: var(--primary-1);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
.loading-text {
    color: var(--text-dim);
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 40px;
}
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-dim);
}
.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}
.error-state {
    text-align: center;
    padding: 40px;
    color: var(--danger);
    font-size: 14px;
}

/* ============================================
   Fade In Animation
   ============================================ */
.fade-in {
    animation: fadeInUp 0.5s ease forwards;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Pulse Highlight (for surge alerts)
   ============================================ */
.pulse-highlight {
    animation: pulseGlow 2s ease-in-out infinite;
}
@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); background: transparent; }
    50% { box-shadow: 0 0 20px 2px rgba(16, 185, 129, 0.25); background: rgba(16, 185, 129, 0.08); }
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 0.2s ease;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.modal-box {
    background: var(--bg-mid);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 28px;
    width: 90%;
    max-width: 480px;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 0.3s ease;
}

/* ============================================
   Toast
   ============================================ */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    padding: 12px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    backdrop-filter: blur(12px);
    animation: slideInRight 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 240px;
}
@keyframes slideInRight {
    from { transform: translateX(120%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
.toast.success { background: rgba(16, 185, 129, 0.2); border: 1px solid rgba(16, 185, 129, 0.3); color: var(--success); }
.toast.error { background: rgba(239, 68, 68, 0.2); border: 1px solid rgba(239, 68, 68, 0.3); color: var(--danger); }
.toast.info { background: rgba(14, 165, 233, 0.2); border: 1px solid rgba(14, 165, 233, 0.3); color: var(--primary-1); }

/* ============================================
   Tag Input (for multi-word compare)
   ============================================ */
.tag-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: rgba(14, 165, 233, 0.15);
    border: 1px solid rgba(14, 165, 233, 0.3);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-bright);
}
.tag-chip .remove {
    cursor: pointer;
    opacity: 0.6;
    transition: var(--transition);
}
.tag-chip .remove:hover {
    opacity: 1;
    color: var(--danger);
}

/* ============================================
   Pagination
   ============================================ */
.pagination {
    display: flex;
    gap: 6px;
    justify-content: center;
    align-items: center;
}
.page-btn {
    min-width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-mid);
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.page-btn:hover:not(:disabled) {
    border-color: var(--primary-1);
    color: var(--primary-1);
    background: rgba(14, 165, 233, 0.08);
}
.page-btn.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
}
.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ============================================
   Category Colors
   ============================================ */
.cat-wallpaper { background: rgba(125, 211, 252, 0.15); color: #7DD3FC; }
.cat-avatar    { background: rgba(56, 189, 248, 0.15); color: #38BDF8; }
.cat-template  { background: rgba(14, 165, 233, 0.15); color: #0EA5E9; }
.cat-resource  { background: rgba(16, 185, 129, 0.15); color: #10B981; }
.cat-tutorial  { background: rgba(245, 158, 11, 0.15); color: #F59E0B; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .stat-value { font-size: 24px; }
    .nav-tab { padding: 6px 12px; font-size: 13px; }
    .data-table { font-size: 12px; }
    .data-table thead th, .data-table tbody td { padding: 8px 10px; }
    .overview-charts, .overview-tables, .trend-grid { grid-template-columns: 1fr !important; }
}

/* ============================================
   Suggest Filter Grid (responsive)
   ============================================ */
.suggest-filter-grid {
    grid-template-columns: 1fr 1fr 1fr auto;
}
@media (max-width: 768px) {
    .suggest-filter-grid {
        grid-template-columns: 1fr;
    }
    .suggest-filter-grid > div:last-child {
        justify-content: stretch;
    }
    .suggest-filter-grid > div:last-child button {
        flex: 1;
    }
}

/* ============================================
   Filter Rules Grid (responsive)
   ============================================ */
.filter-rules-grid {
    grid-template-columns: 1fr 1fr 1fr;
}
@media (max-width: 768px) {
    .filter-rules-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Utility
   ============================================ */
.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeInUp 0.4s ease; }