/* ============================================================
   Hanzi Academy · Landing Page
   营销页设计: 深墨底 hero + 宣纸内容区, 同一品牌语言
   ============================================================ */

:root {
  --ink: #1c1917;
  --ink-2: #57534e;
  --ink-3: #8a857e;
  --paper: #fffaf2;
  --paper-2: #f5ecdc;
  --vermilion: #c2410c;
  --vermilion-deep: #9a3412;
  --gold: #d97706;
  --jade: #0d9488;
  --line: #e8dfce;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-han: "Songti SC", "Noto Serif SC", "STSong", "SimSun", "Kaiti SC", serif;
  --radius: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); background: var(--paper); color: var(--ink); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; border-radius: 12px; padding: 11px 20px;
  font-size: 15px; font-weight: 700; text-decoration: none;
  transition: transform .15s, box-shadow .15s, background .15s;
  cursor: pointer; font-family: inherit;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--vermilion); color: #fff; box-shadow: 0 6px 18px rgba(194,65,12,.3); }
.btn-primary:hover { background: var(--vermilion-deep); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.28); }
.btn-ghost:hover { background: rgba(255,255,255,.16); }
.btn-lg { padding: 14px 26px; font-size: 16px; border-radius: 14px; }

/* ---------------- 导航 ---------------- */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(28,25,23,.92); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(255,255,255,.08); }
.nav-inner { max-width: 1120px; margin: 0 auto; padding: 13px 24px; display: flex; align-items: center; gap: 26px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-seal {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--vermilion), #b91c1c);
  color: #fff; font-family: var(--font-han); font-size: 22px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 3px 10px rgba(192,38,38,.4);
}
.brand-text { color: #fff; font-weight: 800; font-size: 16px; line-height: 1.15; }
.brand-sub { display: block; font-size: 10.5px; color: #a89e8e; letter-spacing: .12em; text-transform: uppercase; }
.nav-links { display: flex; gap: 22px; flex: 1; }
.nav-links a { color: #cfc6b6; text-decoration: none; font-size: 14px; font-weight: 600; transition: color .15s; }
.nav-links a:hover { color: #fff; }
.btn-nav { padding: 9px 16px; font-size: 14px; }

/* ---------------- Hero ---------------- */
.hero {
  background:
    radial-gradient(900px 380px at 85% -10%, rgba(249,115,22,.35), transparent 60%),
    radial-gradient(700px 300px at -10% 110%, rgba(13,148,136,.22), transparent 60%),
    linear-gradient(160deg, #231811 0%, #17110c 55%, #1e130c 100%);
  color: #fff; padding: 72px 24px 84px;
}
.hero-inner { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: 1.05fr .95fr; gap: 52px; align-items: center; }
.hero-badge {
  display: inline-block; background: rgba(217,119,6,.16); border: 1px solid rgba(217,119,6,.4);
  color: #fbbf24; font-size: 13px; font-weight: 700; border-radius: 40px; padding: 6px 14px;
}
.hero h1 { font-size: clamp(36px, 4.6vw, 56px); line-height: 1.12; margin: 20px 0 0; letter-spacing: -.02em; font-weight: 900; }
.hero h1 .accent {
  background: linear-gradient(100deg, #f97316, #ef4444);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { font-size: 17.5px; color: #d8cdbd; margin: 18px 0 26px; max-width: 540px; }
.hero-cta { display: flex; gap: 13px; flex-wrap: wrap; }
.hero-points { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 26px; font-size: 13.5px; color: #b9ac99; }
.hero-points span::before { content: '✓ '; color: var(--jade); font-weight: 800; }

/* 浏览器窗框 */
.browser { background: #fff; border-radius: 14px; overflow: hidden; box-shadow: 0 30px 70px rgba(0,0,0,.5), 0 0 0 1px rgba(255,255,255,.09); }
.browser-bar { display: flex; align-items: center; gap: 7px; background: #f3ece0; padding: 10px 14px; }
.browser-bar i { width: 11px; height: 11px; border-radius: 50%; background: #e2d7c4; display: block; }
.browser-bar i:nth-child(1) { background: #fca5a5; } .browser-bar i:nth-child(2) { background: #fcd34d; } .browser-bar i:nth-child(3) { background: #86efac; }
.browser-bar span { margin-left: 10px; font-size: 12px; color: var(--ink-3); background: #fff; border-radius: 6px; padding: 2px 10px; flex: 0 0 auto; }
.hero-shot .browser { transform: perspective(1200px) rotateY(-6deg) rotateX(2deg); transition: transform .4s; }
.hero-shot:hover .browser { transform: none; }
.feature-media .browser { box-shadow: 0 24px 60px rgba(28,25,23,.25); }

/* ---------------- 章节通用 ---------------- */
section { padding: 76px 24px; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.section-head h2 { font-size: clamp(27px, 3vw, 36px); font-weight: 900; letter-spacing: -.01em; }
.section-head p { color: var(--ink-3); margin-top: 10px; font-size: 16px; }
.section-head b { color: var(--ink); }

/* ---------------- Why ---------------- */
.why-grid { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.why-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 20px; box-shadow: 0 2px 10px rgba(28,25,23,.05);
  transition: transform .18s, box-shadow .18s;
}
.why-card:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(28,25,23,.1); }
.why-ico { font-size: 34px; }
.why-card h3 { font-size: 17px; margin: 12px 0 8px; }
.why-card p { font-size: 14px; color: var(--ink-2); }
.why-card b { font-family: var(--font-han); color: var(--vermilion); font-weight: 700; }

/* ---------------- Features ---------------- */
.features { background: #fdf8ee; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-row { max-width: 1120px; margin: 0 auto 64px; display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.feature-row:last-child { margin-bottom: 0; }
.feature-row.flip .feature-media { order: 2; }
.feature-text h3 { font-size: 21px; font-weight: 800; margin-bottom: 8px; }
.feature-text h3 + h3 { margin-top: 26px; }
.feature-text p { color: var(--ink-2); font-size: 15.5px; }

/* ---------------- Pricing ---------------- */
.price-grid { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.price-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px; display: flex; flex-direction: column;
  box-shadow: 0 2px 10px rgba(28,25,23,.05); position: relative;
}
.price-card.featured { border: 2px solid var(--vermilion); box-shadow: 0 16px 40px rgba(194,65,12,.15); }
.tag-coming {
  position: absolute; top: -13px; left: 22px;
  background: var(--vermilion); color: #fff; font-size: 12px; font-weight: 800;
  padding: 4px 12px; border-radius: 20px;
}
.tag-coming.alt { background: var(--gold); }
.price-card h3 { font-size: 18px; font-weight: 800; }
.price { font-size: 38px; font-weight: 900; margin: 8px 0 16px; letter-spacing: -.02em; }
.price span { font-size: 14px; font-weight: 600; color: var(--ink-3); }
.price-card ul { list-style: none; margin-bottom: 22px; flex: 1; }
.price-card li { padding: 7px 0 7px 26px; position: relative; font-size: 14.5px; color: var(--ink-2); border-bottom: 1px dashed #efe7d7; }
.price-card li:last-child { border-bottom: none; }
.price-card li::before { content: '✓'; position: absolute; left: 2px; color: var(--jade); font-weight: 900; }
.price-card.featured li::before { color: var(--vermilion); }
.price-card .btn { width: 100%; }
.buy-note { font-size: 12px; color: var(--ink-3); margin: 10px 2px 0; line-height: 1.5; text-align: center; }

/* ---------------- Waitlist ---------------- */
.waitlist {
  background:
    radial-gradient(700px 300px at 20% -20%, rgba(217,119,6,.25), transparent 60%),
    linear-gradient(150deg, #231811, #1a120b);
  color: #fff;
}
.wl-inner { max-width: 640px; margin: 0 auto; text-align: center; }
.wl-inner h2 { font-size: clamp(28px, 3.4vw, 40px); font-weight: 900; }
.wl-inner p { color: #d8cdbd; margin: 12px 0 26px; font-size: 16px; }
.wl-inner b { color: var(--gold); }
.wl-form { display: flex; gap: 10px; }
.wl-form input {
  flex: 1; border: 1px solid rgba(255,255,255,.25); border-radius: 14px;
  background: rgba(255,255,255,.07); color: #fff; padding: 15px 18px;
  font-size: 16px; outline: none; font-family: inherit;
}
.wl-form input::placeholder { color: #8d8374; }
.wl-form input:focus { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(217,119,6,.25); }
.wl-msg { margin-top: 14px; font-size: 14.5px; font-weight: 600; min-height: 22px; }
.wl-msg.ok { color: #6ee7b7; }
.wl-msg.bad { color: #fca5a5; }
.wl-note { margin-top: 10px; font-size: 12.5px; color: #8d8374; }

/* ---------------- FAQ ---------------- */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-list details {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  margin-bottom: 12px; padding: 4px 22px; box-shadow: 0 1px 6px rgba(28,25,23,.04);
}
.faq-list summary { cursor: pointer; padding: 15px 0; font-weight: 700; font-size: 15.5px; list-style: none; position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; position: absolute; right: 2px; color: var(--vermilion); font-size: 22px; font-weight: 400; }
.faq-list details[open] summary::after { content: '–'; }
.faq-list p { color: var(--ink-2); padding-bottom: 16px; font-size: 14.5px; }

/* ---------------- Footer ---------------- */
.foot { background: #17110c; color: #8d8374; padding: 26px 24px; font-size: 13px; }
.foot-inner { max-width: 1120px; margin: 0 auto; display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.foot-links a { color: #d8cdbd; text-decoration: none; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 960px) {
  .hero-inner, .feature-row { grid-template-columns: 1fr; gap: 36px; }
  .feature-row.flip .feature-media { order: 0; }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .price-grid { grid-template-columns: 1fr; max-width: 460px; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  section { padding: 54px 18px; }
  .why-grid { grid-template-columns: 1fr; }
  .hero { padding: 52px 18px 60px; }
  .hero-cta .btn { width: 100%; }
  .wl-form { flex-direction: column; }
}