/* ================================================================
   方舟一号 — 精品品牌门户样式
   设计语言：深色基调 + 琥珀金点缀 + 极简现代
   ================================================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #06080d;
  --bg-secondary: #0d1117;
  --bg-card: #111827;
  --bg-card-hover: #1a2235;
  --bg-elevated: #1c2438;
  --border: #1e293b;
  --border-light: #2a3444;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #f59e0b;
  --accent-light: #fbbf24;
  --accent-dark: #d97706;
  --blue: #3b82f6;
  --blue-light: #60a5fa;
  --green: #10b981;
  --green-light: #34d399;
  --red: #ef4444;
  --red-light: #f87171;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,.3);
  --shadow-lg: 0 8px 48px rgba(0,0,0,.5);
  --transition: 0.2s cubic-bezier(.4,0,.2,1);
  --max-width: 1200px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue-light); cursor: pointer; text-decoration: none; }
a:hover { color: var(--blue); }
strong { color: var(--accent-light); }

/* ---------- Markdown 渲染样式 ---------- */
.markdown-body { font-size: 14px; line-height: 1.8; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  color: var(--accent-light); margin: 18px 0 10px; font-weight: 600; line-height: 1.4;
}
.markdown-body h1 { font-size: 20px; }
.markdown-body h2 { font-size: 17px; }
.markdown-body h3 { font-size: 15px; }
.markdown-body h4 { font-size: 14px; }
.markdown-body p { margin: 10px 0; color: var(--text-secondary); }
.markdown-body ul, .markdown-body ol { margin: 10px 0 10px 18px; padding-left: 0; }
.markdown-body li { margin: 6px 0; color: var(--text-secondary); }
.markdown-body blockquote {
  border-left: 3px solid var(--accent); margin: 12px 0; padding: 8px 16px;
  background: rgba(245, 158, 11, 0.08); border-radius: 0 8px 8px 0; color: var(--text-secondary);
}
.markdown-body .md-table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13px; }
.markdown-body .md-table th, .markdown-body .md-table td {
  border: 1px solid var(--border-light); padding: 8px 12px; text-align: left; color: var(--text-secondary);
}
.markdown-body .md-table th { background: var(--bg-elevated); color: var(--accent-light); font-weight: 500; }
.markdown-body .md-table tr:nth-child(even) { background: rgba(255,255,255,0.03); }
.markdown-body pre {
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px; margin: 12px 0; overflow-x: auto; font-family: 'SF Mono', monospace; font-size: 13px;
}
.markdown-body pre .code-block { color: var(--text-primary); white-space: pre-wrap; word-break: break-word; }
.markdown-body .code-inline {
  background: var(--bg-elevated); color: var(--accent-light); padding: 2px 6px; border-radius: 4px;
  font-family: 'SF Mono', monospace; font-size: 12px;
}
.markdown-body img { max-width: 100%; border-radius: 8px; margin: 10px 0; }
.markdown-body a { color: var(--blue-light); text-decoration: underline; }
.markdown-body a:hover { color: var(--blue); }

button { cursor: pointer; font-family: inherit; border: none; outline: none; }

/* ---------- Topbar ---------- */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(6,8,13,.85); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  height: 64px; transition: var(--transition);
}
.topbar.scrolled { background: rgba(6,8,13,.95); box-shadow: 0 1px 12px rgba(0,0,0,.4); }
.topbar-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.brand-icon { font-size: 28px; }
.brand-text { font-size: 20px; font-weight: 800; color: var(--text-primary); }
.brand-accent { color: var(--accent); }
.desktop-nav { display: flex; gap: 8px; }
.nav-link {
  padding: 8px 16px; border-radius: var(--radius-sm); font-size: 14px;
  font-weight: 500; color: var(--text-secondary); transition: var(--transition);
}
.nav-link:hover { color: var(--text-primary); background: rgba(255,255,255,.05); }
.topbar-actions { display: flex; align-items: center; gap: 10px; }

/* Buttons */
.btn-ghost {
  padding: 8px 16px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 500;
  background: transparent; color: var(--text-secondary); transition: var(--transition);
}
.btn-ghost:hover { color: var(--text-primary); background: rgba(255,255,255,.05); }
.btn-primary-sm {
  padding: 8px 18px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600;
  background: var(--accent); color: #0f172a; transition: var(--transition);
}
.btn-primary-sm:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn-primary {
  background: var(--accent); color: #0f172a; font-weight: 600;
  border-radius: var(--radius); padding: 14px 28px; font-size: 15px;
  transition: var(--transition); width: 100%;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn-accent {
  background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff; font-weight: 600;
  border-radius: var(--radius); padding: 14px 28px; font-size: 15px;
  transition: var(--transition); width: 100%;
}
.btn-accent:hover { opacity: .9; transform: translateY(-1px); }
.btn-full { width: 100%; }
.btn-accent-sm {
  padding: 10px 18px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 600;
  background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff; transition: var(--transition);
}
.btn-accent-sm:hover { opacity: .85; }
.btn-accent-sm:disabled, .btn-primary-sm:disabled, .btn-primary:disabled {
  opacity: .4; cursor: not-allowed; transform: none;
}

.points-badge {
  font-size: 13px; color: var(--accent-light); font-weight: 600;
  background: rgba(245,158,11,.1); padding: 6px 12px; border-radius: 20px;
}

/* ---------- Hero Section ---------- */
.hero-section {
  position: relative; min-height: 100vh; display: flex;
  align-items: center; justify-content: center; padding: 120px 24px 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(245,158,11,.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(59,130,246,.06) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(99,102,241,.05) 0%, transparent 50%);
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2394a3b8' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 720px; }
.hero-badge {
  display: inline-block; padding: 6px 16px; border-radius: 20px;
  background: rgba(245,158,11,.1); color: var(--accent-light);
  font-size: 13px; font-weight: 500; margin-bottom: 24px;
  border: 1px solid rgba(245,158,11,.2);
}
.hero-title { font-size: 56px; font-weight: 900; letter-spacing: -1.5px; margin-bottom: 24px; }
.hero-line1 { display: block; color: var(--text-primary); font-size: 36px; font-weight: 700; }
.hero-line2 { display: block; margin-top: 4px; }
.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, #f97316 50%, #ef4444 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 17px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 36px;
  max-width: 560px; margin-left: auto; margin-right: auto;
}
.hero-buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }
.btn-hero-primary {
  padding: 16px 32px; border-radius: var(--radius); font-size: 16px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #f97316);
  color: #0f172a; transition: var(--transition);
  box-shadow: 0 4px 20px rgba(245,158,11,.25);
}
.btn-hero-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(245,158,11,.35); }
.btn-hero-secondary {
  padding: 16px 32px; border-radius: var(--radius); font-size: 16px; font-weight: 600;
  background: rgba(255,255,255,.06); color: var(--text-primary);
  border: 1px solid var(--border-light); transition: var(--transition);
}
.btn-hero-secondary:hover { background: rgba(255,255,255,.1); border-color: var(--text-muted); }
.hero-stats { display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hs-num { display: block; font-size: 28px; font-weight: 800; color: var(--accent); }
.hs-label { display: block; font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* ---------- Section Common ---------- */
.content-section, .pillars-section, .pricing-section {
  max-width: var(--max-width); margin: 0 auto; padding: 100px 24px;
}
.nanyu-cta-section {
  max-width: var(--max-width); margin: 0 auto; padding: 60px 24px 100px;
}
.section-label {
  display: inline-block; padding: 4px 12px; border-radius: 20px;
  font-size: 12px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1px; color: var(--accent); background: rgba(245,158,11,.1);
  margin-bottom: 16px;
}
.section-title {
  font-size: 36px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 12px;
}
.section-sub {
  font-size: 16px; color: var(--text-secondary); margin-bottom: 48px;
}

/* ---------- Pillars ---------- */
.pillars-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.pillar-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px 28px;
  text-align: center; transition: var(--transition); position: relative; overflow: hidden;
  cursor: pointer;
}
.pillar-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.pillar-card[data-color="blue"]::before { background: var(--blue); }
.pillar-card[data-color="amber"]::before { background: var(--accent); }
.pillar-card[data-color="green"]::before { background: var(--green); }
.pillar-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--border-light); }
.pillar-icon { font-size: 40px; margin-bottom: 16px; }
.pillar-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.pillar-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.pillar-owner {
  font-size: 12px; padding: 4px 12px; border-radius: 20px;
  background: rgba(255,255,255,.04); color: var(--text-muted);
  display: inline-block;
}

/* ---------- Nanyu CTA ---------- */
.nanyu-cta-card {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 48px; overflow: hidden;
  position: relative;
}
.nanyu-cta-card::after {
  content: ''; position: absolute; top: -60px; right: -60px; width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(245,158,11,.15), transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.nanyu-cta-left { position: relative; z-index: 1; }
.nanyu-cta-badge {
  display: inline-block; padding: 4px 12px; border-radius: 20px;
  font-size: 12px; font-weight: 600; color: var(--blue-light);
  background: rgba(59,130,246,.1); margin-bottom: 16px;
}
.nanyu-cta-left h2 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.nanyu-cta-left p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.nanyu-features { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.nanyu-features span {
  padding: 6px 14px; border-radius: 20px; font-size: 13px;
  background: rgba(255,255,255,.04); color: var(--text-secondary);
  border: 1px solid var(--border);
}
.nanyu-cta-right { position: relative; z-index: 1; }
.nanyu-preview {
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; font-size: 13px; line-height: 1.7;
  max-height: 320px; overflow-y: auto;
}
.nanyu-preview-msg {
  padding: 10px 14px; border-radius: 10px; margin-bottom: 10px; max-width: 90%;
  font-size: 12.5px; line-height: 1.6;
}
.nanyu-preview-msg.user {
  background: rgba(59,130,246,.15); color: var(--blue-light);
  margin-left: auto; text-align: right;
}
.nanyu-preview-msg.ai {
  background: rgba(255,255,255,.04); color: var(--text-secondary);
}

/* ---------- Cards Grid (Hot & Tutorials) ---------- */
.cards-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px;
}
.content-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; transition: var(--transition);
  cursor: pointer;
}
.content-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--border-light); }
.content-card .card-tag {
  display: inline-block; padding: 2px 10px; border-radius: 12px;
  font-size: 11px; font-weight: 600; margin-bottom: 12px;
}
.card-tag.hot { background: rgba(239,68,68,.15); color: var(--red-light); }
.card-tag.tutorial { background: rgba(16,185,129,.15); color: var(--green-light); }
.card-tag.new { background: rgba(99,102,241,.15); color: #a5b4fc; }
.content-card h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
.content-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.content-card .card-meta {
  font-size: 12px; color: var(--text-muted); margin-top: 12px;
  display: flex; gap: 12px;
}

/* View All */
.view-all-wrap {
  text-align: center; padding: 24px 0;
}
.view-all-link {
  display: inline-block; padding: 10px 28px; border: 1px solid var(--border);
  border-radius: 24px; color: var(--accent-light); font-size: 14px; font-weight: 600;
  text-decoration: none; transition: var(--transition);
}
.view-all-link:hover { background: rgba(245,158,11,.1); border-color: var(--accent); }

/* Loading */
.loading-placeholder {
  display: flex; flex-direction: column; align-items: center; padding: 60px 20px; gap: 16px;
}
.spinner {
  width: 32px; height: 32px; border: 3px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Trust Section ---------- */
.trust-section {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px 60px;
}
.trust-inner {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.trust-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 16px; text-align: center;
  transition: var(--transition); cursor: default;
}
.trust-card:hover {
  border-color: var(--border); box-shadow: none;
}
.trust-num {
  font-size: 36px; font-weight: 900; color: var(--accent);
  margin-bottom: 6px; line-height: 1;
}
.trust-label {
  font-size: 13px; color: var(--text-muted); font-weight: 500;
}
@media (max-width: 768px) {
  .trust-inner { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Pricing Points (v1.3) ---------- */
.pricing-points {
  font-size: 13px; color: var(--accent-light); font-weight: 600;
  background: rgba(245,158,11,.08); padding: 6px 12px; border-radius: 20px;
  margin-bottom: 20px; display: inline-block;
}
.pricing-card.recommend .pricing-points {
  background: rgba(245,158,11,.15);
}

/* ---------- Pricing Extra Row (v1.4 redesign) ---------- */
.pricing-extra-row {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin-top: 36px; padding: 0 4px;
}
.pricing-extra-card {
  position: relative;
  background: linear-gradient(145deg, var(--bg-card) 0%, rgba(30,41,59,0.6) 100%);
  border: 1px solid rgba(148,163,184,0.15);
  border-radius: 20px; padding: 28px 24px 22px;
  text-align: center; transition: all .3s cubic-bezier(.4,0,.2,1);
  cursor: pointer; overflow: hidden;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.pricing-extra-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--accent));
  opacity: 0; transition: opacity .3s;
}
.pricing-extra-card:hover {
  transform: translateY(-6px);
  border-color: rgba(245,158,11,.35);
  box-shadow: 0 12px 40px rgba(245,158,11,.12), 0 4px 12px rgba(0,0,0,.2);
}
.pricing-extra-card:hover::before { opacity: 1; }
.pricing-extra-icon {
  font-size: 34px; line-height: 1; filter: drop-shadow(0 2px 4px rgba(0,0,0,.2));
}
.pricing-extra-title {
  font-size: 15px; font-weight: 700; color: var(--text-primary);
  letter-spacing: .5px;
}
.pricing-extra-price {
  font-size: 28px; font-weight: 900; color: var(--accent);
  letter-spacing: -1px; display: flex; align-items: baseline; gap: 4px;
}
.pricing-extra-price span {
  font-size: 13px; font-weight: 500; color: var(--text-muted);
}
.pricing-extra-desc {
  font-size: 12px; color: var(--text-muted); line-height: 1.5;
  padding: 6px 14px; background: rgba(255,255,255,.03);
  border-radius: 20px; max-width: fit-content; margin: 0 auto;
}
.pricing-extra-btn {
  margin-top: 4px; padding: 10px 28px; border-radius: 12px; font-size: 14px;
  font-weight: 700; background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #0f172a; border: none; transition: all .25s; cursor: pointer;
  letter-spacing: .5px; box-shadow: 0 2px 8px rgba(245,158,11,.25);
}
.pricing-extra-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245,158,11,.35);
}
@media (max-width: 768px) {
  .pricing-extra-row { grid-template-columns: 1fr; gap: 12px; }
  .pricing-extra-card { padding: 24px 20px 18px; border-radius: 16px; }
  .pricing-extra-price { font-size: 24px; }
}

/* ---------- Points Confirm Modal (v1.3) ---------- */
.points-confirm-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,.65);
  display: flex; align-items: center; justify-content: center;
  animation: fadeIn .15s ease;
}
.points-confirm-modal {
  background: var(--bg-card,#111827);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 16px; width: 420px; max-width: 92vw;
  padding: 24px; box-shadow: 0 16px 48px rgba(0,0,0,.5);
}
.pc-header { text-align: center; margin-bottom: 16px; }
.pc-icon { font-size: 36px; }
.pc-header h2 { font-size: 18px; margin: 8px 0 4px; color: var(--text-primary); }
.pc-header p { font-size: 13px; color: var(--text-muted); }
.pc-rules {
  display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px;
  padding: 12px; background: rgba(255,255,255,.03); border-radius: 10px;
}
.pc-rule { font-size: 12px; color: var(--text-secondary); }
.pc-footer { display: flex; flex-direction: column; gap: 12px; }
.pc-remember { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-muted); cursor: pointer; }
.pc-remember input { accent-color: var(--accent); }
.pc-actions { display: flex; gap: 10px; justify-content: flex-end; }

/* ---------- Registration form extended (v1.3) ---------- */
#register-form .form-group { margin-bottom: 12px; }
#register-form .form-group label { font-size: 12px; }
#register-form .form-group input {
  width: 100%; padding: 10px 12px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 14px; outline: none;
  transition: var(--transition);
}
#register-form .form-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(245,158,11,.1); }
#register-form .form-group input::placeholder { color: var(--text-muted); font-size: 12px; }
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pricing-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 36px 28px;
  text-align: center; transition: var(--transition); position: relative;
}
.pricing-card.recommend {
  border-color: var(--accent); box-shadow: 0 0 30px rgba(245,158,11,.1);
  transform: scale(1.03);
}
.pricing-card:hover { transform: translateY(-4px); }
.pricing-card.recommend:hover { transform: scale(1.03) translateY(-4px); }
.pricing-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent), #f97316);
  color: #0f172a; padding: 4px 16px; border-radius: 20px;
  font-size: 12px; font-weight: 700;
}
.pricing-level { font-size: 18px; font-weight: 700; margin-bottom: 16px; color: var(--text-secondary); }
.pricing-card.recommend .pricing-level { color: var(--accent); }
.pricing-price {
  font-size: 48px; font-weight: 900; margin-bottom: 24px;
  color: var(--text-primary);
}
.pricing-period { font-size: 16px; font-weight: 400; color: var(--text-muted); }
.pricing-features { list-style: none; text-align: left; margin-bottom: 28px; }
.pricing-features li { padding: 8px 0; font-size: 14px; color: var(--text-secondary); border-bottom: 1px solid var(--border); }
.pricing-features li:last-child { border: none; }
.btn-pricing {
  width: 100%; padding: 14px; border-radius: var(--radius); font-size: 15px; font-weight: 700;
  background: rgba(255,255,255,.06); color: var(--text-primary);
  border: 1px solid var(--border); transition: var(--transition);
}
.btn-pricing:hover { background: rgba(255,255,255,.1); }
.btn-pricing.primary { background: var(--accent); color: #0f172a; border: none; }
.btn-pricing.primary:hover { background: var(--accent-light); }
.pricing-yearly {
  text-align: center; margin-top: 24px; padding: 16px;
  background: rgba(245,158,11,.05); border-radius: var(--radius);
  font-size: 15px; color: var(--text-secondary);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border); padding: 60px 24px 30px;
  background: var(--bg-secondary);
}
.footer-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 40px;
}
.footer-brand {
  display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 800;
  margin-bottom: 12px;
}
.footer-col h4 { font-size: 14px; font-weight: 700; margin-bottom: 16px; color: var(--text-secondary); }
.footer-col a, .footer-col p { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 8px; cursor: pointer; transition: var(--transition); }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  max-width: var(--max-width); margin: 0 auto; text-align: center;
  padding-top: 20px; border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-muted);
}

/* ---------- Modals ---------- */
.modal-overlay {
  display: none; position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,.7); backdrop-filter: blur(4px);
  align-items: center; justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal-card {
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 36px 32px;
  width: 400px; max-width: 90vw; position: relative;
  animation: modalIn .25s ease;
}
@keyframes modalIn { from { opacity: 0; transform: translateY(20px) scale(.97); } to { opacity: 1; transform: none; } }
.modal-close {
  position: absolute; top: 16px; right: 16px; width: 32px; height: 32px;
  border-radius: 50%; background: rgba(255,255,255,.05); color: var(--text-muted);
  font-size: 16px; display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.modal-close:hover { background: rgba(255,255,255,.1); color: var(--text-primary); }

/* Auth Modal */
.auth-header { text-align: center; margin-bottom: 28px; }
.auth-icon { font-size: 40px; margin-bottom: 8px; }
.auth-title { font-size: 20px; font-weight: 700; }
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-group input {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 15px; outline: none;
  transition: var(--transition);
}
.form-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(245,158,11,.1); }
.form-group input::placeholder { color: var(--text-muted); }
.auth-switch { text-align: center; font-size: 13px; color: var(--text-muted); margin-top: 16px; }
.auth-switch a { color: var(--accent); cursor: pointer; font-weight: 600; }

/* Chat Panel */
.chat-panel {
  display: flex; flex-direction: column;
  width: 500px; max-width: 95vw; height: 600px; max-height: 85vh;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  animation: modalIn .25s ease;
}
.chat-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}
.chat-panel-title { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 700; }
.chat-panel-actions { display: flex; align-items: center; gap: 12px; }
.chat-points { font-size: 13px; color: var(--accent); }
.chat-panel-body { flex: 1; overflow-y: auto; padding: 16px; }
.chat-welcome { text-align: center; padding: 40px 20px; }
.chat-welcome-icon { font-size: 48px; margin-bottom: 12px; }
.chat-welcome h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.chat-welcome p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.chat-suggestions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chat-suggestions span {
  padding: 6px 14px; border-radius: 20px; font-size: 12px;
  background: rgba(255,255,255,.04); border: 1px solid var(--border);
  color: var(--text-secondary); cursor: pointer; transition: var(--transition);
}
.chat-suggestions span:hover { border-color: var(--accent); color: var(--accent); background: rgba(245,158,11,.05); }
.chat-input-area {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}
.input-wrapper { display: flex; gap: 10px; }
.input-wrapper input {
  flex: 1; padding: 14px 18px; border-radius: 24px;
  background: var(--bg-primary); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 15px; outline: none; transition: var(--transition);
}
.input-wrapper input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(245,158,11,.1); }
.input-wrapper input::placeholder { color: var(--text-muted); }
.input-wrapper button {
  width: 48px; height: 48px; border-radius: 50%; background: var(--accent); color: #0f172a;
  display: flex; align-items: center; justify-content: center; cursor: pointer; transition: var(--transition); flex-shrink: 0;
}
.input-wrapper button:hover { background: var(--accent-light); transform: translateY(-1px); }
.input-wrapper button:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.input-hint { text-align: center; font-size: 12px; color: var(--text-muted); margin-top: 10px; }

/* Chat Messages */
.chat-msg { margin-bottom: 12px; animation: msgIn .3s ease; }
@keyframes msgIn { from { opacity: 0; transform: translateY(8px); } }
.chat-msg-inner {
  display: inline-block; max-width: 85%; padding: 10px 14px; border-radius: 12px;
  font-size: 13.5px; line-height: 1.7;
}
.chat-msg.user .chat-msg-inner { background: rgba(59,130,246,.15); color: var(--blue-light); float: right; }
.chat-msg.ai .chat-msg-inner { background: rgba(255,255,255,.04); color: var(--text-secondary); }
.chat-msg.pending .chat-msg-inner {
  background: rgba(255,255,255,.02); border: 1px dashed var(--border);
  color: var(--text-muted); font-style: italic; font-size: 12px;
}

/* Profile Card */
.profile-card { width: 440px; }
.profile-head { text-align: center; margin-bottom: 24px; }
.profile-avatar { font-size: 52px; margin-bottom: 8px; }
.profile-name { font-size: 20px; font-weight: 700; }
.profile-level {
  display: inline-block; padding: 3px 12px; margin-top: 6px; border-radius: 12px;
  font-size: 12px; font-weight: 600;
  background: rgba(245,158,11,.1); color: var(--accent);
}
.profile-stats-row {
  display: flex; gap: 16px; margin-bottom: 24px;
  padding: 16px; border-radius: var(--radius); background: var(--bg-card);
  border: 1px solid var(--border);
}
.profile-stat { flex: 1; text-align: center; }
.ps-num { font-size: 24px; font-weight: 800; color: var(--accent); }
.ps-label { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.profile-menu { display: flex; flex-direction: column; gap: 4px; }
.pmenu-item {
  display: flex; align-items: center; gap: 10px; padding: 12px 14px;
  border-radius: var(--radius-sm); font-size: 14px; cursor: pointer;
  color: var(--text-secondary); transition: var(--transition);
}
.pmenu-item:hover { background: rgba(255,255,255,.04); color: var(--text-primary); }
.pmenu-item.disabled { opacity: .4; cursor: not-allowed; }
.pmenu-item.disabled:hover { background: transparent; color: var(--text-secondary); }
.pmenu-item.danger { color: var(--red); }
.pmenu-item.danger:hover { background: rgba(239,68,68,.08); }
.pmenu-item small { color: var(--text-muted); font-size: 11px; margin-left: auto; }

/* Profile Detail Modal */
.profile-detail-card {
  width: min(90vw, 560px);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
}
.profile-detail-title {
  font-size: 18px;
  font-weight: 700;
  padding: 20px 24px 0;
  margin: 0;
  color: var(--text-primary);
  flex-shrink: 0;
}
.profile-detail-body {
  padding: 16px 24px 24px;
  overflow-y: auto;
  flex: 1;
}
.pd-list { display: flex; flex-direction: column; gap: 8px; }
.pd-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.pd-item-clickable, .pd-clickable { cursor: pointer; }
.pd-item-clickable:hover, .pd-clickable:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-1px);
}
.pd-item-num {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(245,158,11,.12); color: var(--accent);
  font-size: 12px; font-weight: 700; flex-shrink: 0;
}
.pd-item-icon { font-size: 18px; flex-shrink: 0; width: 28px; text-align: center; }
.pd-item-main { flex: 1; min-width: 0; }
.pd-item-title {
  font-size: 14px; font-weight: 600; color: var(--text-primary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.pd-item-meta {
  font-size: 12px; color: var(--text-muted); margin-top: 2px;
}
.pd-item-arrow {
  font-size: 18px; color: var(--text-muted); flex-shrink: 0;
}
.pd-item-right {
  font-size: 14px; font-weight: 700; flex-shrink: 0;
}
.pd-item-right.plus { color: var(--green-light); }
.pd-item-right.minus { color: var(--red-light); }

@media (max-width: 640px) {
  .profile-detail-card { width: 96vw; max-height: 90vh; }
  .profile-detail-title { padding: 16px 16px 0; font-size: 17px; }
  .profile-detail-body { padding: 14px 16px 16px; }
}

/* Checkin Dialog */
.checkin-dialog {
  text-align: center; padding: 40px 32px; width: 360px;
}
.checkin-icon { font-size: 52px; margin-bottom: 12px; }
.checkin-dialog h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.checkin-earned {
  font-size: 40px; font-weight: 900; color: var(--accent); margin-bottom: 6px;
}
.checkin-total { font-size: 13px; color: var(--text-muted); margin-bottom: 24px; }

/* Toast */
.toast-container {
  position: fixed; top: 80px; right: 24px; z-index: 3000;
  display: flex; flex-direction: column; gap: 8px;
}
.toast {
  padding: 12px 24px; border-radius: var(--radius-sm); color: #fff;
  font-size: 14px; font-weight: 500; animation: toastIn .3s ease; white-space: nowrap;
}
.toast.success { background: var(--green); }
.toast.error { background: var(--red); }
.toast.info { background: var(--blue); }
@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .desktop-nav { display: none; }
  .hero-title { font-size: 32px; }
  .hero-line1 { font-size: 24px; }
  .hero-desc { font-size: 14px; }
  .hero-stats { gap: 20px; }
  .hs-num { font-size: 22px; }
  .pillars-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card.recommend { transform: none; }
  .pricing-card.recommend:hover { transform: translateY(-4px); }
  .nanyu-cta-card { grid-template-columns: 1fr; padding: 28px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .section-title { font-size: 26px; }
  .content-section, .pillars-section, .pricing-section { padding: 60px 16px; }
  .chat-panel { width: 100vw; height: 100vh; max-width: 100vw; max-height: 100vh; border-radius: 0; }
}

@media (max-width: 480px) {
  .topbar-inner { padding: 0 12px; }
  .brand-text { font-size: 16px; }
  .btn-hero-primary, .btn-hero-secondary { padding: 12px 20px; font-size: 14px; width: 100%; }
  .hero-buttons { flex-direction: column; }
  .profile-card { width: 95vw; }
  .auth-card { width: 95vw; }
}

/* 内容详情弹窗 */
.content-detail-card {
  width: min(90vw, 800px);
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}
.content-detail-title {
  font-size: 20px;
  font-weight: 700;
  padding: 24px 24px 0;
  margin: 0;
  color: var(--text);
  flex-shrink: 0;
}
.content-detail-body {
  padding: 20px 24px 24px;
  overflow-y: auto;
  flex: 1;
  color: var(--text);
  line-height: 1.8;
  font-size: 15px;
}
.content-detail-body h1,
.content-detail-body h2,
.content-detail-body h3,
.content-detail-body h4 {
  margin-top: 18px;
  margin-bottom: 10px;
  color: var(--text);
}
.content-detail-body p {
  margin-bottom: 12px;
}
.content-detail-body ul,
.content-detail-body ol {
  padding-left: 20px;
  margin-bottom: 12px;
}
.content-detail-body li {
  margin-bottom: 6px;
}
.content-detail-body strong {
  color: var(--text);
  font-weight: 600;
}
@media (max-width: 640px) {
  .content-detail-card {
    width: 96vw;
    max-height: 90vh;
  }
  .content-detail-title {
    padding: 16px 16px 0;
    font-size: 18px;
  }
  .content-detail-body {
    padding: 14px 16px 16px;
  }
}

/* =====================================================
   左侧隐藏导航栏 (首页/门户用)
   ===================================================== */
.nav-trigger-zone {
  position: fixed; top: 0; left: 0; width: 28px; height: 100vh; z-index: 90;
}
.trigger-hint {
  position: absolute; top: 50%; left: 0; transform: translateY(-50%);
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 48px; pointer-events: auto; cursor: pointer;
  transition: opacity .25s ease, transform .25s ease;
  opacity: .45;
}
.nav-trigger-zone:hover .trigger-hint { opacity: .9; transform: translateY(-50%) scale(1.05); }

/* 小、淡、精致的 SVG 风格箭头 */
.hint-arrow {
  width: 0; height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-left: 10px solid rgba(241, 245, 249, .55);
  filter: drop-shadow(0 0 4px rgba(241, 245, 249, .15));
  transition: all .25s ease;
}
.nav-trigger-zone:hover .hint-arrow {
  border-left-color: rgba(241, 245, 249, .85);
  filter: drop-shadow(0 0 6px rgba(241, 245, 249, .3));
  transform: translateX(2px);
}
.nav-trigger-zone:active .hint-arrow { transform: translateX(3px) scale(.92); }

/* 导航栏必须在触发器之上，确保按钮可点 */
.wb-nav {
  position: fixed; top: 0; left: 0; width: 240px; height: 100vh;
  background: rgba(13, 17, 23, .98); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; z-index: 1001; transform: translateX(-100%);
  transition: transform .28s cubic-bezier(.4,0,.2,1); box-shadow: 4px 0 24px rgba(0,0,0,.5);
  backdrop-filter: blur(12px);
}
.wb-nav.expanded { transform: translateX(0); }
.wb-nav .nav-brand { height: 64px; padding: 0 18px; border-bottom: 1px solid var(--border); display: flex; align-items: center; }
.wb-nav .nav-brand-link { display: flex; align-items: center; gap: 10px; color: var(--text-primary); text-decoration: none; font-weight: 700; font-size: 16px; }
.wb-nav .nav-brand-icon { font-size: 24px; }
.wb-nav .nav-menu { flex: 1; padding: 12px 10px; display: flex; flex-direction: column; gap: 6px; overflow-y: auto; }
.wb-nav .nav-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 10px;
  color: var(--text-secondary); text-decoration: none; cursor: pointer; transition: var(--transition); white-space: nowrap;
  font-size: 14px;
}
.wb-nav .nav-item:hover { background: rgba(255,255,255,.06); color: var(--text-primary); }
.wb-nav .nav-item.nav-primary { background: rgba(245,158,11,.08); color: var(--accent); font-weight: 600; }
.wb-nav .nav-item.nav-primary:hover { background: rgba(245,158,11,.15); color: var(--accent-light); }
.wb-nav .nav-item.active { background: rgba(245,158,11,.12); color: var(--accent-light); border-left: 3px solid var(--accent); }
.wb-nav .nav-icon { font-size: 18px; width: 24px; text-align: center; flex-shrink: 0; }
.wb-nav .nav-footer { padding: 14px 10px; border-top: 1px solid var(--border); }
.wb-nav .nav-footer-link {
  display: flex; align-items: center; gap: 12px; padding: 10px 14px; border-radius: 10px;
  color: var(--text-muted); text-decoration: none; cursor: pointer; transition: var(--transition); font-size: 14px;
}
.wb-nav .nav-footer-link:hover { background: rgba(255,255,255,.06); color: var(--text-primary); }

/* 侧边栏展开时，在主内容上加遮罩，点击遮罩关闭 */
.nav-overlay {
  display: none; position: fixed; inset: 0; z-index: 1000; background: rgba(0,0,0,.45); backdrop-filter: blur(2px);
}
.nav-overlay.show { display: block; }

/* ---- #256 复合指令确认弹窗 ---- */
.multi-step-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,.65);
  display: flex; align-items: center; justify-content: center;
  animation: fadeIn .15s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.multi-step-modal {
  background: var(--bg-card,#111827);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 16px;
  width: 500px; max-width: 92vw; max-height: 80vh;
  display: flex; flex-direction: column;
  padding: 24px;
  box-shadow: 0 16px 48px rgba(0,0,0,.5);
}
.ms-header { text-align: center; margin-bottom: 16px; }
.ms-icon { font-size: 32px; }
.ms-header h2 { font-size: 18px; margin: 8px 0 4px; }
.ms-header p { font-size: 13px; color: var(--text-muted,#6b7280); }

.ms-body {
  flex: 1; overflow-y: auto;
  margin-bottom: 16px;
  display: flex; flex-direction: column; gap: 8px;
}
.ms-step {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 10px; cursor: pointer;
  transition: border-color .15s;
}
.ms-step:hover { border-color: rgba(59,130,246,.4); }
.ms-step input[type=checkbox] { margin-top: 3px; accent-color: #3b82f6; width: 16px; height: 16px; flex-shrink: 0; }
.ms-num { color: #3b82f6; font-weight: 700; font-size: 13px; min-width: 24px; }
.ms-text { color: #d1d5db; font-size: 14px; line-height: 1.5; white-space: pre-wrap; }

.ms-footer { display: flex; gap: 10px; justify-content: flex-end; }
.ms-btn { padding: 8px 20px; border-radius: 8px; font-size: 14px; cursor: pointer; border: none; transition: all .15s; }
.ms-btn-cancel { background: rgba(255,255,255,.06); color: #9ca3af; }
.ms-btn-cancel:hover { background: rgba(255,255,255,.12); }
.ms-btn-go { background: #3b82f6; color: #fff; font-weight: 600; }
.ms-btn-go:hover { background: #2563eb; }

/* ---- #257 视频链接卡片 ---- */
.video-link-card {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 12px;
  background: rgba(59,130,246,.08);
  border: 1px solid rgba(59,130,246,.2);
  border-radius: 10px;
  margin: 6px 0;
  text-decoration: none; color: inherit;
  transition: border-color .15s;
}
.video-link-card:hover { border-color: rgba(59,130,246,.5); }
.vlc-icon { font-size: 18px; margin-right: 4px; }
.vlc-thumb { width: 80px; height: 56px; flex-shrink: 0; border-radius: 6px; overflow: hidden; background: rgba(0,0,0,.3); }
.vlc-thumb img { width: 100%; height: 100%; object-fit: cover; }
.vlc-info { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.vlc-title { font-size: 13px; font-weight: 600; color: var(--text-primary,#e5e7eb); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.vlc-desc { font-size: 12px; color: #9ca3af; }
.vlc-domain { font-size: 11px; color: #6b7280; }

/* 自定义滚动条 */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(148,163,184,.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(148,163,184,.35); }
/* Firefox */
* { scrollbar-width: thin; scrollbar-color: rgba(148,163,184,.2) transparent; }

/* ---------- 评论区样式 ---------- */
.comment-section { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }
.comment-section-title { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 16px; }
.comment-list { display: flex; flex-direction: column; gap: 12px; }
.comment-item {
  padding: 12px 16px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); transition: var(--transition);
}
.comment-item:hover { border-color: var(--border-light); }
.comment-header { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.comment-avatar { width: 28px; height: 28px; border-radius: 50%; background: rgba(245,158,11,.12); display: flex; align-items: center; justify-content: center; font-size: 14px; flex-shrink: 0; }
.comment-username { font-size: 13px; font-weight: 600; color: var(--text-primary); }
.comment-time { font-size: 11px; color: var(--text-muted); }
.comment-content { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.comment-input-area { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.comment-input {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 14px; outline: none; resize: vertical; min-height: 60px;
  transition: var(--transition);
}
.comment-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(245,158,11,.1); }
.comment-input::placeholder { color: var(--text-muted); }
.comment-submit-btn {
  padding: 10px 20px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600;
  background: var(--accent); color: #0f172a; border: none; cursor: pointer;
  transition: var(--transition); align-self: flex-end;
}
.comment-submit-btn:hover { background: var(--accent-light); }
.comment-submit-btn:disabled { opacity: .4; cursor: not-allowed; }
.comment-empty { text-align: center; padding: 20px; color: var(--text-muted); font-size: 14px; }

/* =====================================================
   南鱼AI 悬浮球 (首页/全站通用)
   ===================================================== */
.ai-float-btn{position:fixed;bottom:28px;right:28px;width:56px;height:56px;background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);border:2px solid rgba(245,158,11,.3);border-radius:50%;cursor:pointer;z-index:1000;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 24px rgba(245,158,11,.15),0 1px 4px rgba(0,0,0,.3);transition:transform .25s,box-shadow .25s,border-color .25s,opacity .25s}
.ai-float-btn:hover{transform:scale(1.08);box-shadow:0 6px 32px rgba(245,158,11,.28),0 2px 8px rgba(0,0,0,.4);border-color:rgba(245,158,11,.6)}
.ai-float-btn.hidden{opacity:0;pointer-events:none;transform:scale(.8)}
.ai-float-icon{font-size:26px;line-height:1;position:relative;z-index:1}
.ai-float-pulse{position:absolute;top:50%;left:50%;width:56px;height:56px;border-radius:50%;background:rgba(245,158,11,.12);transform:translate(-50%,-50%);animation:float-pulse 2.5s ease-out infinite}
@keyframes float-pulse{0%{transform:translate(-50%,-50%) scale(.9);opacity:.7}100%{transform:translate(-50%,-50%) scale(1.6);opacity:0}}
.ai-float-badge{position:absolute;top:-4px;right:-4px;background:linear-gradient(135deg,#f59e0b,#fbbf24);color:#0a0a0a;font-size:10px;font-weight:800;padding:2px 6px;border-radius:8px;letter-spacing:.5px;box-shadow:0 2px 6px rgba(245,158,11,.4)}
.ai-float-window{position:fixed;bottom:28px;right:28px;width:400px;height:560px;max-height:calc(100vh - 80px);background:var(--bg-secondary,#1e293b);border:1px solid rgba(245,158,11,.2);border-radius:16px;box-shadow:0 12px 48px rgba(0,0,0,.5),0 2px 12px rgba(245,158,11,.08);z-index:999;display:flex;flex-direction:column;overflow:hidden;opacity:0;transform:translateY(20px) scale(.95);pointer-events:none;transition:opacity .25s,transform .25s}
.ai-float-window.open{opacity:1;transform:translateY(0) scale(1);pointer-events:auto}
.ai-float-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);border-bottom:1px solid rgba(245,158,11,.15);flex-shrink:0}
.ai-float-header-left{display:flex;align-items:center;gap:10px}
.ai-float-avatar{font-size:22px;line-height:1}
.ai-float-title{font-size:15px;font-weight:700;color:var(--text-primary,#e5e7eb)}
.ai-float-status{font-size:11px;color:#4ade80;padding:2px 8px;background:rgba(74,222,128,.1);border-radius:10px;border:1px solid rgba(74,222,128,.2)}
.ai-float-status.thinking{color:#f59e0b;background:rgba(245,158,11,.1);border-color:rgba(245,158,11,.3);animation:blink 1s ease-in-out infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.5}}
.ai-float-header-actions{display:flex;gap:6px}
.ai-float-minimize,.ai-float-expand{width:28px;height:28px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.04);color:var(--text-muted,#94a3b8);border-radius:8px;cursor:pointer;font-size:13px;display:flex;align-items:center;justify-content:center;transition:background .2s,color .2s}
.ai-float-minimize:hover,.ai-float-expand:hover{background:rgba(255,255,255,.1);color:var(--text-primary,#e5e7eb)}
.ai-float-quick{display:flex;flex-wrap:wrap;gap:8px;padding:12px 16px;border-bottom:1px solid var(--border,rgba(255,255,255,.08));flex-shrink:0}
.ai-quick-btn{padding:6px 14px;border:1px solid rgba(245,158,11,.2);background:rgba(245,158,11,.06);color:var(--text-secondary,#cbd5e1);border-radius:20px;cursor:pointer;font-size:12px;white-space:nowrap;transition:background .2s,border-color .2s,color .2s}
.ai-quick-btn:hover{background:rgba(245,158,11,.15);border-color:rgba(245,158,11,.4);color:#f59e0b}
.ai-float-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}
.ai-msg{display:flex;gap:10px;max-width:88%;align-self:flex-start}
.ai-msg-user{align-self:flex-end;flex-direction:row-reverse}
.ai-msg-avatar{font-size:20px;line-height:1;width:30px;height:30px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.04);border-radius:50%;flex-shrink:0}
.ai-msg-user .ai-msg-avatar{background:rgba(59,130,246,.15)}
.ai-msg-content{background:rgba(255,255,255,.04);border-radius:12px;padding:10px 14px;line-height:1.55;font-size:13px;color:var(--text-secondary,#cbd5e1)}
.ai-msg-user .ai-msg-content{background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.15)}
.ai-msg-welcome .ai-msg-content{background:rgba(245,158,11,.05);border:1px solid rgba(245,158,11,.08)}
.ai-msg-pending .ai-msg-content{opacity:.7}
.ai-msg-text{word-break:break-word}
.ai-msg-text p{margin-bottom:6px}
.ai-msg-text p:last-child{margin-bottom:0}
.ai-msg-hint{font-size:11px;color:var(--text-muted,#94a3b8);margin-top:6px}
.ai-msg-source{margin-top:8px;padding-top:8px;border-top:1px solid rgba(255,255,255,.06);font-size:11px;color:var(--text-muted,#94a3b8)}
.ai-float-input-area{padding:12px 16px;border-top:1px solid var(--border,rgba(255,255,255,.08));flex-shrink:0;background:rgba(0,0,0,.15)}
.ai-float-input-row{display:flex;gap:8px;align-items:flex-end}
.ai-float-input-row textarea{flex:1;background:rgba(255,255,255,.05);border:1px solid var(--border,rgba(255,255,255,.08));border-radius:12px;color:var(--text-primary,#e5e7eb);padding:10px 14px;font-size:13px;font-family:inherit;resize:none;max-height:100px;line-height:1.5;transition:border-color .2s;outline:none}
.ai-float-input-row textarea:focus{border-color:rgba(245,158,11,.4);background:rgba(255,255,255,.07)}
.ai-float-input-row textarea::placeholder{color:var(--text-muted,#94a3b8)}
.ai-float-send{width:36px;height:36px;border:none;border-radius:10px;background:linear-gradient(135deg,rgba(245,158,11,.2),rgba(245,158,11,.1));color:#f59e0b;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .2s,transform .15s}
.ai-float-send:hover{background:linear-gradient(135deg,rgba(245,158,11,.35),rgba(245,158,11,.2))}
.ai-float-send:active{transform:scale(.92)}
.ai-float-send:disabled{opacity:.4;cursor:not-allowed}
.ai-float-points-info{text-align:right;font-size:11px;color:var(--text-muted,#94a3b8);margin-top:6px}
.ai-float-points-info span{color:#f59e0b;font-weight:600}
.ai-float-mic{width:36px;height:36px;border:1px solid var(--border,rgba(255,255,255,.08));background:rgba(255,255,255,.04);color:var(--text-muted,#94a3b8);border-radius:10px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .2s,border-color .2s,color .2s;-webkit-user-select:none;user-select:none}
.ai-float-mic:hover{border-color:#f59e0b;color:#f59e0b;background:rgba(245,158,11,.08)}
.ai-float-mic.recording{background:rgba(245,158,11,.2);border-color:#f59e0b;color:#f59e0b;animation:voice-pulse .8s ease-in-out infinite}
@keyframes voice-pulse{0%,100%{box-shadow:0 0 0 0 rgba(245,158,11,.4)}50%{box-shadow:0 0 0 6px rgba(245,158,11,0)}}

/* ============================================================
   全面响应式移动端适配 (v1.4.0+)
   断点: Tablet 768px / Phone 480px / Small Phone 375px
   ============================================================ */

/* ---------- Tablet & Small Desktop (≤900px) ---------- */
@media (max-width: 900px) {
  .hero-title { font-size: 40px; }
  .hero-line1 { font-size: 28px; }
  .hero-desc { font-size: 15px; }
  .hero-section { padding: 110px 20px 70px; }
  .content-section, .pillars-section, .pricing-section { padding: 70px 20px; }
  .pricing-grid { gap: 18px; }
  .pricing-card { padding: 28px 20px; }
  .pricing-price { font-size: 38px; }
  .footer-inner { gap: 32px; }
}

/* ---------- Tablet Portrait (≤768px) ---------- */
@media (max-width: 768px) {
  /* — Topbar — */
  .desktop-nav { display: none; }
  .topbar { height: 56px; }
  .topbar-inner { padding: 0 16px; }
  .brand-text { font-size: 17px; }
  .brand-icon { font-size: 24px; }
  .topbar-actions { gap: 6px; }
  .points-badge { font-size: 11px; padding: 4px 10px; border-radius: 14px; }
  .btn-ghost { padding: 6px 10px; font-size: 12px; }
  .btn-primary-sm { padding: 7px 14px; font-size: 12px; }

  /* — Hero — */
  .hero-section { padding: 100px 16px 56px; min-height: auto; }
  .hero-badge { font-size: 12px; padding: 4px 12px; margin-bottom: 16px; }
  .hero-title { font-size: 32px; }
  .hero-line1 { font-size: 24px; }
  .hero-desc { font-size: 14px; max-width: 100%; margin-bottom: 28px; }
  .hero-stats { gap: 20px; }
  .hs-num { font-size: 22px; }
  .hs-label { font-size: 12px; }
  .btn-hero-primary, .btn-hero-secondary { padding: 14px 24px; font-size: 14px; }

  /* — Sections — */
  .content-section, .pillars-section, .pricing-section { padding: 56px 16px; }
  .nanyu-cta-section { padding: 36px 16px 56px; }
  .trust-section { padding: 0 16px 50px; }
  .section-title { font-size: 26px; margin-bottom: 8px; }
  .section-sub { font-size: 14px; margin-bottom: 32px; }
  .section-label { font-size: 11px; padding: 3px 10px; }

  /* — Grids — */
  .pillars-grid { grid-template-columns: 1fr; gap: 16px; }
  .cards-grid { grid-template-columns: 1fr; gap: 14px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; gap: 20px; }
  .pricing-card.recommend { transform: none; }
  .pricing-card.recommend:hover { transform: translateY(-4px); }
  .pricing-price { font-size: 36px; }
  .pricing-level { font-size: 16px; }
  .pricing-badge { font-size: 11px; padding: 3px 14px; }
  .pricing-yearly { font-size: 14px; padding: 14px; }

  /* — Pricing Extra — */
  .pricing-extra-row { grid-template-columns: 1fr; gap: 12px; max-width: 420px; margin-left: auto; margin-right: auto; }
  .pricing-extra-card { padding: 24px 20px 18px; border-radius: 16px; }
  .pricing-extra-price { font-size: 24px; }
  .pricing-extra-btn { padding: 10px 24px; font-size: 13px; }

  /* — Nanyu CTA — */
  .nanyu-cta-card { grid-template-columns: 1fr; padding: 28px 24px; gap: 28px; }
  .nanyu-cta-left h2 { font-size: 24px; }
  .nanyu-cta-left p { font-size: 14px; }
  .nanyu-features { gap: 8px; }
  .nanyu-features span { font-size: 11px; padding: 5px 10px; }
  .nanyu-preview { max-height: 240px; }

  /* — Trust — */
  .trust-inner { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .trust-card { padding: 20px 12px; }
  .trust-num { font-size: 28px; }
  .trust-label { font-size: 12px; }

  /* — Footer — */
  .footer-inner { grid-template-columns: 1fr; gap: 28px; margin-bottom: 28px; }
  .footer-bottom { font-size: 11px; }
  .site-footer { padding: 40px 20px 24px; }

  /* — Modal Dialogs — */
  .modal-overlay { padding: 12px; }
  .modal-card { width: 92vw; max-width: 92vw; padding: 28px 20px; border-radius: var(--radius); }
  .modal-close { top: 12px; right: 12px; }
  .auth-title { font-size: 18px; }
  .auth-icon { font-size: 32px; }
  .form-group input { padding: 10px 12px; font-size: 14px; }
  .form-group label { font-size: 12px; }

  /* — Profile Card — */
  .profile-card { width: 92vw; }
  .profile-stats-row { padding: 12px; gap: 8px; }
  .profile-avatar { font-size: 44px; }
  .profile-name { font-size: 18px; }
  .ps-num { font-size: 20px; }
  .pmenu-item { padding: 10px 12px; font-size: 13px; }

  /* — Profile Detail — */
  .profile-detail-card { width: 96vw; max-height: 90vh; }
  .profile-detail-title { padding: 16px 16px 0; font-size: 17px; }
  .profile-detail-body { padding: 14px 16px 16px; }
  .pd-item { padding: 10px 12px; }

  /* — Checkin Dialog — */
  .checkin-dialog { width: 320px; padding: 32px 24px; }
  .checkin-icon { font-size: 44px; }
  .checkin-earned { font-size: 34px; }
  .checkin-dialog h3 { font-size: 18px; }
  .checkin-total { font-size: 12px; }

  /* — Chat Panel (portal popup) — */
  .chat-panel { width: 100vw; height: 100vh; max-width: 100vw; max-height: 100vh; border-radius: 0; }
  .chat-panel-header { padding: 12px 16px; }
  .chat-panel-title { font-size: 15px; }
  .chat-panel-body { padding: 12px 14px; }
  .chat-input-area { padding: 12px 16px; }
  .input-wrapper input { padding: 12px 14px; font-size: 14px; }
  .input-wrapper button { width: 42px; height: 42px; }
  .chat-suggestions span { font-size: 11px; padding: 5px 10px; }
  .chat-welcome-icon { font-size: 40px; }
  .chat-welcome h3 { font-size: 17px; }
  .chat-msg-inner { font-size: 13px; max-width: 90%; }
  .markdown-body { font-size: 13px; }
  .markdown-body h1 { font-size: 18px; }
  .markdown-body h2 { font-size: 16px; }
  .markdown-body h3 { font-size: 14px; }

  /* — Points Confirm Modal — */
  .points-confirm-modal { width: 96vw; max-width: 96vw; padding: 20px; }
  .pc-header h2 { font-size: 17px; }
  .pc-header p { font-size: 12px; }
  .pc-rule { font-size: 11px; }
  .pc-actions { flex-wrap: wrap; }

  /* — Multi-step Modal — */
  .multi-step-modal { width: 95vw; padding: 20px; }
  .ms-header h2 { font-size: 16px; }
  .ms-step { padding: 8px 10px; }
  .ms-text { font-size: 13px; }

  /* — Video Link Card — */
  .video-link-card { flex-direction: column; align-items: stretch; }
  .vlc-thumb { width: 100%; height: auto; aspect-ratio: 16/9; }

  /* — Content Detail — */
  .content-detail-card { width: 96vw; max-height: 90vh; border-radius: 12px; }
  .content-detail-title { padding: 16px 16px 0; font-size: 18px; }
  .content-detail-body { padding: 14px 16px 16px; font-size: 14px; }

  /* — Comment Section — */
  .comment-section-title { font-size: 15px; }
  .comment-item { padding: 10px 12px; }
  .comment-input { min-height: 50px; font-size: 13px; }
  .comment-submit-btn { width: 100%; text-align: center; }

  /* — Toast — */
  .toast-container { top: 68px; right: 12px; left: 12px; }
  .toast { white-space: normal; text-align: center; font-size: 13px; padding: 10px 16px; }

  /* — Registration Form — */
  #register-form .form-group { margin-bottom: 10px; }
  #register-form .form-group input { padding: 10px 12px; font-size: 14px; }
  #register-form .form-group label { font-size: 11px; }

  /* — Nav Trigger — */
  .nav-trigger-zone { width: 20px; }
  .trigger-hint { width: 20px; height: 40px; }
  .hint-arrow { border-left-width: 8px; border-top-width: 7px; border-bottom-width: 7px; }
}

/* ---------- Mobile Phone (≤480px) ---------- */
@media (max-width: 480px) {
  /* — Topbar — */
  .topbar { height: 52px; }
  .topbar-inner { padding: 0 10px; }
  .brand-text { font-size: 15px; }
  .brand-icon { font-size: 22px; }
  .brand { gap: 6px; }
  .points-badge { font-size: 10px; padding: 3px 8px; border-radius: 12px; }
  .btn-primary-sm { padding: 5px 10px; font-size: 11px; border-radius: 6px; }
  .btn-ghost { padding: 5px 8px; font-size: 11px; }

  /* — Hero — */
  .hero-section { padding: 80px 12px 40px; }
  .hero-badge { font-size: 11px; padding: 3px 10px; }
  .hero-title { font-size: 26px; }
  .hero-line1 { font-size: 20px; }
  .hero-desc { font-size: 13px; line-height: 1.6; margin-bottom: 24px; }
  .btn-hero-primary, .btn-hero-secondary { padding: 12px 20px; font-size: 14px; width: 100%; }
  .hero-buttons { flex-direction: column; gap: 10px; }
  .hero-stats { gap: 14px; }
  .hs-num { font-size: 18px; }
  .hs-label { font-size: 11px; }

  /* — Sections — */
  .content-section, .pillars-section, .pricing-section { padding: 40px 12px; }
  .nanyu-cta-section { padding: 28px 12px 44px; }
  .trust-section { padding: 0 12px 36px; }
  .section-title { font-size: 22px; }
  .section-sub { font-size: 13px; margin-bottom: 24px; }

  /* — Pillars — */
  .pillar-card { padding: 22px 16px; border-radius: var(--radius); }
  .pillar-card h3 { font-size: 17px; }
  .pillar-card p { font-size: 13px; }
  .pillar-icon { font-size: 32px; }

  /* — Grids — */
  .cards-grid { gap: 10px; }
  .content-card { padding: 16px 14px; border-radius: var(--radius-sm); }
  .content-card h4 { font-size: 14px; }
  .content-card p { font-size: 12px; }

  /* — Pricing — */
  .pricing-grid { max-width: 100%; }
  .pricing-card { padding: 22px 16px; border-radius: var(--radius); }
  .pricing-level { font-size: 15px; margin-bottom: 10px; }
  .pricing-price { font-size: 30px; margin-bottom: 16px; }
  .pricing-features li { font-size: 12px; padding: 6px 0; }
  .pricing-yearly { font-size: 12px; padding: 10px; }
  .btn-pricing { padding: 12px; font-size: 13px; }
  .pricing-badge { font-size: 10px; padding: 2px 12px; top: -10px; }

  /* — Pricing Extra — */
  .pricing-extra-row { max-width: 100%; }
  .pricing-extra-card { padding: 18px 14px; gap: 8px; }
  .pricing-extra-icon { font-size: 28px; }
  .pricing-extra-title { font-size: 13px; }
  .pricing-extra-price { font-size: 22px; }
  .pricing-extra-btn { padding: 8px 18px; font-size: 12px; }
  .pricing-extra-desc { font-size: 11px; padding: 4px 10px; }

  /* — Nanyu CTA — */
  .nanyu-cta-card { padding: 20px 16px; }
  .nanyu-cta-left h2 { font-size: 20px; }
  .nanyu-cta-left p { font-size: 13px; }
  .nanyu-preview { max-height: 200px; font-size: 12px; }
  .nanyu-preview-msg { font-size: 11px; }

  /* — Trust — */
  .trust-inner { grid-template-columns: 1fr; gap: 8px; }
  .trust-card { padding: 16px 10px; }
  .trust-num { font-size: 24px; }
  .trust-label { font-size: 11px; }

  /* — Footer — */
  .footer-inner { gap: 20px; }
  .footer-brand { font-size: 15px; }
  .footer-col h4 { font-size: 13px; }
  .footer-col a, .footer-col p { font-size: 12px; }
  .site-footer { padding: 32px 14px 20px; }

  /* — Modal Dialogs — */
  .modal-card { width: 96vw; padding: 22px 16px; border-radius: var(--radius); }
  .modal-close { top: 8px; right: 8px; width: 28px; height: 28px; font-size: 14px; }
  .auth-title { font-size: 17px; }
  .auth-icon { font-size: 28px; }
  .auth-switch { font-size: 12px; }

  /* — Profile — */
  .profile-card { width: 96vw; }
  .profile-stats-row { flex-direction: column; gap: 6px; padding: 10px; }
  .profile-avatar { font-size: 38px; }
  .profile-name { font-size: 17px; }
  .ps-num { font-size: 18px; }

  /* — Checkin — */
  .checkin-dialog { width: 90vw; padding: 24px 16px; }
  .checkin-icon { font-size: 36px; }
  .checkin-earned { font-size: 28px; }
  .checkin-dialog h3 { font-size: 16px; }

  /* — Points Confirm — */
  .points-confirm-modal { width: 96vw; padding: 16px; }
  .pc-header h2 { font-size: 15px; }

  /* — Multi-step — */
  .multi-step-modal { padding: 14px; }

  /* — Content Detail — */
  .content-detail-title { font-size: 16px; }
  .content-detail-body { font-size: 13px; }

  /* — Chat Suggestions — */
  .chat-suggestions { gap: 6px; }
  .chat-suggestions span { font-size: 10px; padding: 4px 8px; }

  /* — Toast — */
  .toast-container { top: 60px; right: 8px; left: 8px; }

  /* — Nav Trigger — */
  .nav-trigger-zone { width: 16px; }
  .trigger-hint { width: 16px; height: 36px; }
  .hint-arrow { border-left-width: 6px; border-top-width: 5px; border-bottom-width: 5px; }

  /* — View All — */
  .view-all-link { padding: 8px 20px; font-size: 12px; }
}

/* ---------- Small Phone (≤375px) ---------- */
@media (max-width: 375px) {
  .topbar { height: 48px; }
  .topbar-inner { padding: 0 8px; }
  .brand-text { font-size: 14px; }
  .brand-icon { font-size: 18px; }
  .brand { gap: 4px; }

  .hero-section { padding: 72px 10px 32px; }
  .hero-title { font-size: 22px; }
  .hero-line1 { font-size: 18px; }
  .hero-desc { font-size: 12px; }

  .section-title { font-size: 20px; }
  .content-section, .pillars-section, .pricing-section { padding: 32px 10px; }
  .nanyu-cta-section { padding: 24px 10px 36px; }

  .pricing-price { font-size: 26px; }
  .trust-num { font-size: 20px; }

  .btn-hero-primary, .btn-hero-secondary { padding: 10px 16px; font-size: 13px; }
  .btn-primary-sm { font-size: 10px; padding: 4px 8px; }

  .pillar-card { padding: 18px 14px; }
  .pillar-card h3 { font-size: 16px; }

  .content-card { padding: 14px 12px; }

  .nanyu-cta-card { padding: 16px 14px; }
  .nanyu-cta-left h2 { font-size: 18px; }

  .modal-card { padding: 20px 14px; }

  .footer-inner { gap: 16px; }
}