/* ============================================================
   Heai Design System — Inspired by Epic Games / Fab.com
   Dark, professional, commercial-grade UI
   ============================================================ */

/* ---- RESET & BASE ---- */
:root {
    --bg-0: #0a0a0f;
    --bg-1: #111118;
    --bg-2: #191922;
    --bg-3: #22222e;
    --bg-card: #16161e;
    --bg-card-hover: #1e1e28;
    --bg-input: #111118;
    --accent: #a259f7;
    --accent-hover: #b370ff;
    --accent-soft: rgba(162,89,247,0.12);
    --accent-glow: rgba(162,89,247,0.35);
    --blue: #3b82f6;
    --green: #22c55e;
    --amber: #f59e0b;
    --red: #ef4444;
    --text-0: #f0f0f5;
    --text-1: #c8c8d4;
    --text-2: #8888a0;
    --text-3: #555568;
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --nav-h: 64px;
    --max-w: 1320px;
    --side-pad: max(24px, calc((100vw - var(--max-w)) / 2));
}

/* ---- LIGHT THEME ---- */
[data-theme="light"] {
    --bg-0: #f5f5f7;
    --bg-1: #eeeef2;
    --bg-2: #e4e4ea;
    --bg-3: #d8d8e0;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f8fc;
    --bg-input: #ffffff;
    --accent: #7c3aed;
    --accent-hover: #6d28d9;
    --accent-soft: rgba(124,58,237,0.08);
    --accent-glow: rgba(124,58,237,0.25);
    --text-0: #1a1a2e;
    --text-1: #333350;
    --text-2: #666680;
    --text-3: #9999aa;
    --border: rgba(0,0,0,0.08);
    --border-hover: rgba(0,0,0,0.15);
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
}

/* Light theme specific overrides */
[data-theme="light"] .topnav {
    background: rgba(245,245,247,0.92);
}

[data-theme="light"] .topnav-links a:hover { background: rgba(0,0,0,0.04); }
[data-theme="light"] .topnav-links a.active { background: rgba(0,0,0,0.06); }

[data-theme="light"] .btn-ghost:hover { background: rgba(0,0,0,0.04); }

[data-theme="light"] tr:hover td { background: rgba(0,0,0,0.02); }

[data-theme="light"] .hero-bg {
    background: linear-gradient(135deg, rgba(124,58,237,0.06) 0%, transparent 50%) !important;
}

[data-theme="light"] .toast.error { background: rgba(239,68,68,0.08); border-color: rgba(239,68,68,0.2); color: #c53030; }
[data-theme="light"] .toast.success { background: rgba(34,197,94,0.08); border-color: rgba(34,197,94,0.2); color: #15803d; }
[data-theme="light"] .toast.info { background: rgba(124,58,237,0.08); border-color: rgba(124,58,237,0.2); color: #6d28d9; }

[data-theme="light"] ::selection { background: var(--accent); color: #fff; }

/* ---- Theme Toggle Button ---- */
.theme-toggle {
    position: relative;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.25s ease;
    flex-shrink: 0;
    padding: 0;
    line-height: 1;
}
.theme-toggle:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
    transform: scale(1.08);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon { transition: opacity 0.25s, transform 0.25s; position: absolute; }
.theme-toggle .icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
.theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

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

html { scroll-behavior: smooth; }

body {
    background: var(--bg-0);
    color: var(--text-1);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }

::selection { background: var(--accent); color: #fff; }

/* ---- TYPOGRAPHY ---- */
h1, h2, h3, h4 { color: var(--text-0); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem; }

.text-accent { color: var(--accent); }
.text-muted { color: var(--text-2); }
.text-sm { font-size: 0.85rem; }
.text-xs { font-size: 0.75rem; }
.text-center { text-align: center; }

/* ---- TOP NAVIGATION BAR ---- */
.topnav {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--nav-h);
    background: rgba(10,10,15,0.88);
    backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 32px;
    gap: 32px;
}

.topnav-logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent);
    letter-spacing: 1.5px;
    flex-shrink: 0;
}

.topnav-links {
    display: flex;
    gap: 4px;
    flex: 1;
}

.topnav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-2);
    transition: color 0.15s, background 0.15s;
    white-space: nowrap;
}

.topnav-links a:hover { color: var(--text-0); background: rgba(255,255,255,0.04); }
.topnav-links a.active { color: var(--text-0); background: rgba(255,255,255,0.06); }

.topnav-search {
    position: relative;
    flex: 0 1 280px;
}

.topnav-search input {
    width: 100%;
    padding: 9px 14px 9px 36px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-0);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s;
}

.topnav-search input::placeholder { color: var(--text-3); }
.topnav-search input:focus { border-color: var(--accent); }

.topnav-search::before {
    content: '⌕';
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-3);
    font-size: 1rem;
}

.topnav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* ---- BUTTONS ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 20px var(--accent-glow); }

.btn-secondary {
    background: var(--bg-3);
    color: var(--text-1);
    border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--border-hover); color: var(--text-0); background: var(--bg-card-hover); }

.btn-ghost {
    background: transparent;
    color: var(--text-2);
    padding: 8px 14px;
}
.btn-ghost:hover { color: var(--text-0); background: rgba(255,255,255,0.04); }

.btn-sm { padding: 7px 14px; font-size: 0.82rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-icon { padding: 8px; width: 36px; height: 36px; border-radius: var(--radius-sm); }

.btn:disabled, .btn.disabled { opacity: 0.4; pointer-events: none; }

/* ---- LAYOUT ---- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 32px; }
.section { padding: 80px 0; }
.section-header { margin-bottom: 40px; }
.section-header h2 { margin-bottom: 10px; }
.section-header p { color: var(--text-2); max-width: 600px; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 24px; }

/* ---- HERO SECTION ---- */
.hero {
    position: relative;
    padding: 100px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(162,89,247,0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
}

.hero h1 { margin-bottom: 20px; }
.hero p { font-size: 1.1rem; color: var(--text-2); margin-bottom: 32px; line-height: 1.8; max-width: 560px; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--accent-soft);
    border: 1px solid rgba(162,89,247,0.2);
    border-radius: 100px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ---- CARDS ---- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.card-thumb {
    aspect-ratio: 16/10;
    background: var(--bg-2);
    overflow: hidden;
    position: relative;
}

.card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.card:hover .card-thumb img { transform: scale(1.04); }

.card-body { padding: 16px; }
.card-body h3 { font-size: 0.95rem; margin-bottom: 6px; }
.card-meta { font-size: 0.78rem; color: var(--text-2); }

.card-price {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

.card-price .price {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-0);
}

.card-price .price-free {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--green);
}

.card-price .price-old {
    font-size: 0.82rem;
    color: var(--text-3);
    text-decoration: line-through;
}

.card-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-badge.new { background: var(--accent); color: #fff; }
.card-badge.sale { background: var(--red); color: #fff; }
.card-badge.free { background: var(--green); color: #fff; }

.card-rating {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.78rem;
    color: var(--amber);
}

/* ---- ASSET CARD (marketplace specific) ---- */
.asset-card { cursor: pointer; }
.asset-card .card-body { padding: 14px 16px; }

.asset-card .publisher {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    font-size: 0.75rem;
    color: var(--text-3);
}

.asset-card .publisher img {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bg-3);
}

/* ---- SIDEBAR FILTERS ---- */
.sidebar {
    width: 240px;
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--nav-h) + 24px);
    max-height: calc(100vh - var(--nav-h) - 48px);
    overflow-y: auto;
}

.filter-group { margin-bottom: 28px; }

.filter-group h4 {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-3);
    margin-bottom: 12px;
}

.filter-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 0;
    font-size: 0.88rem;
    color: var(--text-2);
    cursor: pointer;
    transition: color 0.15s;
}

.filter-item:hover { color: var(--text-0); }
.filter-item.active { color: var(--accent); }

.filter-item .count {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-3);
}

.filter-check {
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--text-3);
    border-radius: 3px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.filter-item.active .filter-check {
    background: var(--accent);
    border-color: var(--accent);
}

.filter-item.active .filter-check::after {
    content: '✓';
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
}

/* ---- TABS ---- */
.tabs {
    display: flex;
    gap: 2px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.tab {
    padding: 12px 20px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-2);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s, border-color 0.15s;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}

.tab:hover { color: var(--text-0); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ---- TAG PILLS ---- */
.tag {
    display: inline-flex;
    padding: 5px 12px;
    background: var(--bg-3);
    border-radius: 100px;
    font-size: 0.78rem;
    color: var(--text-2);
    transition: all 0.15s;
    cursor: pointer;
}

.tag:hover { color: var(--text-0); background: var(--bg-card-hover); }
.tag.active { background: var(--accent-soft); color: var(--accent); }

/* ---- FORM ELEMENTS ---- */
.form-group { margin-bottom: 20px; }

.form-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: 8px;
}

.form-hint {
    font-size: 0.75rem;
    color: var(--text-3);
    margin-top: 6px;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 11px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-0);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-input::placeholder, .form-textarea::placeholder { color: var(--text-3); }
.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-soft);
}

.form-select { 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 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%238888a0' stroke-width='1.5'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; }

.form-textarea { min-height: 120px; resize: vertical; }

/* ---- UPLOAD ZONE ---- */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.upload-zone:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.upload-zone .upload-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.upload-zone p { color: var(--text-2); font-size: 0.9rem; }
.upload-zone .upload-hint { font-size: 0.78rem; color: var(--text-3); margin-top: 6px; }

/* ---- STEPPER (publish workflow) ---- */
.stepper {
    display: flex;
    align-items: center;
    gap: 0;
    margin-bottom: 40px;
    padding: 0 20px;
}

.stepper-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-3);
    white-space: nowrap;
}

.stepper-item.active { color: var(--accent); }
.stepper-item.done { color: var(--green); }

.stepper-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--text-3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.stepper-item.active .stepper-num { border-color: var(--accent); background: var(--accent); color: #fff; }
.stepper-item.done .stepper-num { border-color: var(--green); background: var(--green); color: #fff; }

.stepper-line {
    flex: 1;
    height: 1px;
    background: var(--border);
    margin: 0 12px;
}

.stepper-line.done { background: var(--green); }

/* ---- TABLE ---- */
.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.88rem;
}

th { color: var(--text-3); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.5px; }
td { color: var(--text-1); }

tr:hover td { background: rgba(255,255,255,0.02); }

/* ---- STATUS BADGE ---- */
.status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.status-live { background: rgba(34,197,94,0.1); color: var(--green); }
.status-live::before { background: var(--green); }
.status-review { background: rgba(245,158,11,0.1); color: var(--amber); }
.status-review::before { background: var(--amber); }
.status-draft { background: rgba(136,136,160,0.1); color: var(--text-2); }
.status-draft::before { background: var(--text-3); }
.status-rejected { background: rgba(239,68,68,0.1); color: var(--red); }
.status-rejected::before { background: var(--red); }

/* ---- STAT CARD ---- */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
}

.stat-card .stat-value { font-size: 1.8rem; font-weight: 700; color: var(--text-0); }
.stat-card .stat-label { font-size: 0.82rem; color: var(--text-2); margin-top: 4px; }
.stat-card .stat-change { font-size: 0.78rem; color: var(--green); margin-top: 4px; }

/* ---- FEATURE SHOWCASE ---- */
.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 60px 0;
    border-bottom: 1px solid var(--border);
}

.feature-row:last-child { border-bottom: none; }
.feature-row:nth-child(even) { direction: rtl; }
.feature-row:nth-child(even) > * { direction: ltr; }

.feature-visual {
    aspect-ratio: 16/10;
    background: var(--bg-2);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
}

.feature-text h3 { font-size: 1.5rem; margin-bottom: 12px; }
.feature-text p { color: var(--text-2); line-height: 1.8; margin-bottom: 20px; }

/* ---- FOOTER ---- */
.site-footer {
    background: var(--bg-1);
    border-top: 1px solid var(--border);
    padding: 64px 0 0;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr);
    gap: 40px;
    padding-bottom: 48px;
}

.footer-brand .footer-logo {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--accent);
    letter-spacing: 1.5px;
    margin-bottom: 14px;
}

.footer-brand p { font-size: 0.85rem; color: var(--text-3); line-height: 1.7; max-width: 280px; }

.footer-col h4 {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-2);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    padding: 5px 0;
    font-size: 0.85rem;
    color: var(--text-3);
    transition: color 0.15s;
}

.footer-col a:hover { color: var(--text-0); }

.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.78rem;
    color: var(--text-3);
}

.footer-bottom a { color: var(--text-3); transition: color 0.15s; }
.footer-bottom a:hover { color: var(--accent); }

.footer-legal {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

/* ---- BANNER / CTA ---- */
.cta-banner {
    background: linear-gradient(135deg, rgba(162,89,247,0.15), rgba(59,130,246,0.08));
    border: 1px solid rgba(162,89,247,0.2);
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
}

.cta-banner h2 { margin-bottom: 12px; }
.cta-banner p { color: var(--text-2); margin-bottom: 24px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ---- COMMUNITY CARDS ---- */
.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: border-color 0.2s;
    cursor: pointer;
}

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

.post-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.post-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-3);
    flex-shrink: 0;
}

.post-author { font-size: 0.88rem; font-weight: 600; color: var(--text-0); }
.post-time { font-size: 0.75rem; color: var(--text-3); }

.post-card h3 { font-size: 1rem; margin-bottom: 8px; }
.post-card p { font-size: 0.88rem; color: var(--text-2); line-height: 1.6; }

.post-stats {
    display: flex;
    gap: 20px;
    margin-top: 14px;
    font-size: 0.78rem;
    color: var(--text-3);
}

.post-stats span { display: flex; align-items: center; gap: 4px; }

/* ---- GUIDELINES PAGE ---- */
.doc-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 48px;
}

.doc-nav {
    position: sticky;
    top: calc(var(--nav-h) + 24px);
}

.doc-nav a {
    display: block;
    padding: 8px 16px;
    font-size: 0.85rem;
    color: var(--text-3);
    border-left: 2px solid transparent;
    transition: all 0.15s;
}

.doc-nav a:hover { color: var(--text-0); }
.doc-nav a.active { color: var(--accent); border-left-color: var(--accent); background: var(--accent-soft); }

.doc-content h2 { margin-top: 48px; margin-bottom: 16px; padding-top: 24px; border-top: 1px solid var(--border); }
.doc-content h2:first-child { margin-top: 0; border-top: none; padding-top: 0; }
.doc-content h3 { margin-top: 28px; margin-bottom: 10px; }
.doc-content p { margin-bottom: 14px; color: var(--text-1); line-height: 1.8; }
.doc-content ul, .doc-content ol { margin-bottom: 14px; padding-left: 24px; }
.doc-content li { margin-bottom: 6px; color: var(--text-1); line-height: 1.7; }

.doc-content .callout {
    background: var(--accent-soft);
    border-left: 3px solid var(--accent);
    padding: 16px 20px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 20px 0;
    font-size: 0.9rem;
}

.doc-content .callout-warn {
    background: rgba(245,158,11,0.08);
    border-left-color: var(--amber);
}

.doc-content .callout-danger {
    background: rgba(239,68,68,0.08);
    border-left-color: var(--red);
}

/* ---- EMPTY STATE ---- */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-3);
}

.empty-state .empty-icon { font-size: 3rem; margin-bottom: 16px; }
.empty-state h3 { color: var(--text-2); margin-bottom: 8px; }
.empty-state p { font-size: 0.88rem; margin-bottom: 24px; }

/* ---- TOAST ---- */
.toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    z-index: 10000;
    opacity: 0;
    transition: all 0.3s;
    pointer-events: none;
    backdrop-filter: blur(12px);
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); color: #f88; }
.toast.success { background: rgba(34,197,94,0.15); border: 1px solid rgba(34,197,94,0.3); color: #7fd7a0; }
.toast.info { background: rgba(162,89,247,0.15); border: 1px solid rgba(162,89,247,0.3); color: #c9a0f7; }

/* ---- LOADING ---- */
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ---- CARD THUMB IMAGE FIX ---- */
.asset-card .card-thumb { position: relative; }
.asset-card .card-thumb img { position: absolute; inset: 0; }

/* ---- RESPONSIVE ---- */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
    .grid-5 { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-row { grid-template-columns: 1fr; gap: 24px; }
    .feature-row:nth-child(even) { direction: ltr; }
    .doc-layout { grid-template-columns: 1fr; }
    .doc-nav { display: none; }
}

@media (max-width: 768px) {
    .topnav { padding: 0 16px; gap: 12px; }
    .topnav-links { display: none; }
    .topnav-search { flex: 1; }
    .container { padding: 0 16px; }
    .section { padding: 48px 0; }
    .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .hero { padding: 60px 0 40px; }
    .hero h1 { font-size: 1.8rem; }
    .sidebar { display: none; }
    .cta-banner { padding: 32px 20px; }
    .stepper { flex-direction: column; align-items: flex-start; gap: 12px; }
    .stepper-line { display: none; }
}

@media (max-width: 480px) {
    .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
}