:root {
    --bg: #0b1020;
    --panel: rgba(18, 24, 43, 0.82);
    --panel-soft: rgba(26, 32, 56, 0.72);
    --line: rgba(125, 143, 179, 0.18);
    --text: #edf2ff;
    --muted: #94a3b8;
    --primary: #6d7cff;
    --primary-2: #8b5cf6;
    --success: #22c55e;
    --danger: #ef4444;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: radial-gradient(circle at top, rgba(109,124,255,.18), transparent 35%), linear-gradient(135deg, #070b16, #11182c 55%, #0b1020);
    color: var(--text);
    min-height: 100vh;
}
body, input, textarea, select, button { font: inherit; }
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
    width: 260px; padding: 24px 18px; border-right: 1px solid var(--line);
    background: rgba(7, 11, 22, 0.72); backdrop-filter: blur(18px);
    display: flex; flex-direction: column; gap: 26px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-icon {
    width: 44px; height: 44px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-2)); font-size: 20px; font-weight: 700;
    box-shadow: 0 16px 40px rgba(109,124,255,.35);
}
.brand h1, .brand p { margin: 0; }
.brand p, .muted { color: var(--muted); font-size: 13px; }
.nav-menu { display: flex; flex-direction: column; gap: 10px; }
.nav-item {
    color: #cbd5e1; text-decoration: none; padding: 14px 16px; border-radius: 14px;
    background: transparent; border: 1px solid transparent; transition: .25s ease;
}
.nav-item:hover, .nav-item.active { background: rgba(109,124,255,.14); border-color: rgba(109,124,255,.35); color: white; }
.sidebar-footer { margin-top: auto; }
.main-panel { flex: 1; display: flex; flex-direction: column; }
.topbar {
    height: 72px; display: flex; justify-content: space-between; align-items: center;
    padding: 0 28px; border-bottom: 1px solid var(--line); background: rgba(12, 18, 33, .38);
    backdrop-filter: blur(12px);
}
.topbar-title { font-size: 18px; font-weight: 700; }
.topbar-user {
    padding: 10px 14px; border-radius: 999px; background: rgba(255,255,255,.05); color: #dbeafe;
}
.content-area { padding: 28px; }
.hero-card, .panel-card, .feature-card, .template-card, .community-card {
    background: var(--panel); border: 1px solid var(--line); border-radius: 24px; backdrop-filter: blur(18px);
}
.hero-card {
    display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px; padding: 32px; align-items: stretch;
}
.badge {
    display: inline-flex; padding: 7px 12px; border-radius: 999px; background: rgba(109,124,255,.14);
    color: #c7d2fe; font-size: 13px; margin-bottom: 16px;
}
.hero-card h2 { margin: 0 0 14px; font-size: 42px; line-height: 1.15; }
.hero-card p { margin: 0; color: #cbd5e1; line-height: 1.7; }
.hero-actions { display: flex; gap: 14px; margin-top: 26px; }
.primary-btn, .ghost-btn, .mode-btn {
    border: 0; border-radius: 14px; padding: 13px 18px; cursor: pointer; transition: .25s ease;
}
.primary-btn {
    color: white; text-decoration: none; background: linear-gradient(135deg, var(--primary), var(--primary-2));
    box-shadow: 0 16px 36px rgba(109,124,255,.28);
}
.primary-btn.full-width { width: 100%; }
.ghost-btn {
    color: white; text-decoration: none; background: rgba(255,255,255,.06); border: 1px solid var(--line);
}
.preview-card {
    height: 100%; border-radius: 22px; padding: 24px; background: linear-gradient(180deg, rgba(109,124,255,.18), rgba(14,20,37,.72));
    display: flex; flex-direction: column; justify-content: end;
}
.preview-label { color: #bfdbfe; font-size: 13px; margin-bottom: 10px; }
.feature-grid, .template-grid { display: grid; gap: 18px; margin-top: 24px; }
.feature-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.feature-card { padding: 22px; }
.feature-card h3, .template-card span, .community-card h3 { margin: 0 0 8px; }
.feature-card p, .community-card p { color: var(--muted); margin: 0; line-height: 1.7; }
.template-section, .section-head { margin-top: 28px; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.section-head.compact { margin-top: 0; }
.section-head h2, .section-head h3 { margin: 0; }
.section-head a { color: #c7d2fe; text-decoration: none; }
.template-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.template-card { min-height: 190px; padding: 20px; display: flex; align-items: end; background: linear-gradient(180deg, rgba(109,124,255,.16), rgba(17,24,39,.72)); }
.template-card.tall { min-height: 260px; }
.create-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 22px; }
.panel-card { padding: 24px; }
.mode-switch { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0 22px; }
.mode-btn { background: rgba(255,255,255,.05); color: #dbe4ff; border: 1px solid transparent; }
.mode-btn.active { background: rgba(109,124,255,.16); border-color: rgba(109,124,255,.4); }
.form-stack { display: flex; flex-direction: column; gap: 16px; }
label { display: flex; flex-direction: column; gap: 8px; color: #dbe4ff; font-size: 14px; }
input[type="text"], input[type="file"], textarea, select {
    width: 100%; border-radius: 14px; border: 1px solid rgba(148,163,184,.18); background: rgba(7,11,22,.65);
    color: white; padding: 14px 16px; outline: none;
}
textarea { resize: vertical; min-height: 120px; }
.two-col { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.hidden-block { display: none; }
.preview-stage {
    min-height: 420px; border-radius: 20px; border: 1px dashed rgba(148,163,184,.2); background: rgba(7,11,22,.4);
    display: flex; align-items: center; justify-content: center; padding: 20px;
}
.preview-empty { text-align: center; color: var(--muted); }
.preview-video { width: 100%; border-radius: 18px; background: black; }
.task-meta { margin-top: 18px; padding: 16px; border-radius: 16px; background: rgba(255,255,255,.04); color: #dbe4ff; }
.status-success { color: var(--success); }
.status-failed { color: var(--danger); }
.community-list { display: grid; gap: 18px; }
.community-card { padding: 22px; }
@media (max-width: 1100px) {
    .feature-grid, .template-grid, .create-layout, .hero-card { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
    .app-shell { flex-direction: column; }
    .sidebar { width: 100%; }
    .feature-grid, .template-grid, .create-layout, .hero-card, .two-col { grid-template-columns: 1fr; }
    .content-area { padding: 18px; }
}