/* Aiferi landing — no external fonts/CDNs (mainland China friendly) */
:root {
  --paper: #f6f1e7;
  --paper-2: #efe6d6;
  --card: #fffdf8;
  --ink: #1d1b22;
  --ink-2: #47434f;
  --muted: #7a7482;
  --line: #ddd2bf;
  --accent: #c8402f;
  --accent-dark: #a83526;
  --accent-soft: #f3d9cf;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.25; margin: 0; }
p { margin: 0; }

.wrap { width: min(1160px, 100% - 32px); margin-inline: auto; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 22px; border-radius: 999px;
  background: var(--accent); color: #fff; text-decoration: none;
  font-weight: 600; font-size: 15px; border: 1.5px solid var(--accent);
  cursor: pointer; transition: background .15s, transform .15s;
  font-family: inherit;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-block { width: 100%; padding: 14px; }
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 700 22px/1 var(--serif); letter-spacing: .02em; }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a { text-decoration: none; color: var(--ink-2); font-size: 15px; }
.nav-links a:hover { color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang {
  background: none; border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 12px; font: 600 13px/1 var(--sans); color: var(--ink-2); cursor: pointer;
}
.lang:hover { border-color: var(--ink); color: var(--ink); }

/* Section scaffolding */
section { padding: 96px 0; }
.kicker {
  font: 600 13px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 16px;
}
.kicker::before { content: "● "; font-size: 9px; vertical-align: 2px; }
.section-title { font-size: clamp(28px, 4vw, 42px); max-width: 18em; }
.section-lead { color: var(--ink-2); font-size: 17px; max-width: 36em; margin-top: 16px; }

/* Hero */
.hero { padding: 72px 0 150px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 64px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; font-size: 13px; color: var(--ink-2); margin-bottom: 28px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.hero h1 { font-size: clamp(44px, 7vw, 84px); font-weight: 900; letter-spacing: -.01em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.lead { font-size: 18px; color: var(--ink-2); margin-top: 24px; max-width: 30em; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 8px 24px; list-style: none; padding: 0; margin: 28px 0 0; color: var(--muted); font-size: 14px; }
.hero-points li::before { content: "✓ "; color: var(--accent); font-weight: 700; }

/* Character sheet */
.sheet {
  position: relative; margin: 0;
  background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  padding: 26px 26px 18px;
  box-shadow: 0 1px 0 var(--line), 0 30px 60px -30px rgba(60, 40, 20, .35);
  transform: rotate(1.2deg);
}
.crop { position: absolute; width: 14px; height: 14px; border-color: var(--ink); opacity: .5; }
.crop.tl { top: 8px; left: 8px; border-top: 1px solid; border-left: 1px solid; }
.crop.tr { top: 8px; right: 8px; border-top: 1px solid; border-right: 1px solid; }
.crop.bl { bottom: 8px; left: 8px; border-bottom: 1px solid; border-left: 1px solid; }
.crop.br { bottom: 8px; right: 8px; border-bottom: 1px solid; border-right: 1px solid; }
.stamp {
  position: absolute; top: 18px; right: 22px;
  width: 64px; height: 64px; border-radius: 50%;
  border: 2.5px solid var(--accent); color: var(--accent);
  display: grid; place-items: center; transform: rotate(-14deg);
  font: 900 17px/1 var(--serif); letter-spacing: .1em; opacity: .85;
}
.stamp::after { content: ""; position: absolute; inset: 4px; border: 1px solid var(--accent); border-radius: 50%; }
.sheet-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; padding-right: 76px; border-bottom: 2px solid var(--ink); padding-bottom: 12px; }
.sheet-no { font: 600 11px/1 var(--mono); letter-spacing: .12em; color: var(--muted); margin-bottom: 8px; }
.sheet-name { font-size: 30px; font-weight: 900; }
.sheet-name small { font: 600 13px/1 var(--mono); letter-spacing: .14em; color: var(--muted); margin-left: 6px; }
.sheet-role { font-size: 13px; color: var(--ink-2); white-space: nowrap; }
.sheet-fields { display: grid; grid-template-columns: repeat(4, auto); gap: 4px 18px; margin: 14px 0 16px; font-size: 13px; }
.sheet-fields div { display: flex; flex-direction: column; }
.sheet-fields dt { font: 600 10.5px/1.6 var(--mono); letter-spacing: .1em; color: var(--muted); }
.sheet-fields dd { margin: 0; color: var(--ink); }
.views { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.view { background: var(--paper); border: 1px solid var(--line); border-radius: 4px; padding: 10px 6px 0; display: flex; flex-direction: column; }
.view img { aspect-ratio: 3 / 4; object-fit: contain; object-position: bottom; width: 100%; }
.view span { font: 600 10.5px/1 var(--mono); color: var(--muted); padding: 8px 2px; border-top: 1px dashed var(--line); text-align: center; }
.view b { font-family: var(--sans); color: var(--ink); font-weight: 600; }
.faces { display: grid; grid-template-columns: repeat(3, 64px) 1fr; gap: 10px; margin-top: 12px; align-items: center; }
.face { text-align: center; font-size: 11px; color: var(--ink-2); }
.face img { width: 64px; height: 64px; border-radius: 50%; background: var(--paper-2); border: 1px solid var(--line); margin-bottom: 4px; }
.prompt { background: var(--ink); color: #e8e3da; border-radius: 6px; padding: 10px 12px; align-self: stretch; }
.prompt p { font: 700 10px/1 var(--mono); letter-spacing: .14em; color: var(--accent-soft); margin-bottom: 6px; }
.prompt code { font: 11px/1.5 var(--mono); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.sheet figcaption { margin-top: 12px; font-size: 11px; color: var(--muted); text-align: right; }

/* Real sheet image in hero */
.sheet-real { padding: 14px 14px 12px; }
.sheet-real img { width: 100%; height: auto; border-radius: 2px; }
.sheet-real figcaption { margin-top: 10px; }

/* Real case gallery */
.case { padding-top: 24px; }
.case-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 40px; }
.shot { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; text-decoration: none; transition: transform .2s, box-shadow .2s; }
.shot:hover { transform: translateY(-3px); box-shadow: 0 18px 32px -20px rgba(60, 40, 20, .45); }
.shot img { width: 100%; height: auto; aspect-ratio: 2 / 3; object-fit: cover; background: #a9abb3; }
.shot span { display: flex; gap: 8px; align-items: baseline; padding: 10px 12px; font-size: 14px; border-top: 1px solid var(--line); }
.shot b { font: 700 12px/1 var(--mono); color: var(--accent); }
.shot i { font-style: normal; color: var(--ink); }
.shot-cta { justify-content: center; align-items: flex-start; gap: 20px; padding: 24px; background: var(--ink); border-color: var(--ink); }
.shot-cta:hover { transform: none; }
.cta-big { font: 800 24px/1.35 var(--serif); color: var(--paper); }
.case-note { margin-top: 16px; color: var(--muted); font-size: 13px; }

/* Asset pack card overlapping the sheet */
.pack {
  position: absolute; left: -44px; bottom: -100px; z-index: 2;
  background: var(--ink); color: #e8e3da; border-radius: 10px;
  padding: 12px 16px 12px 14px; transform: rotate(-3deg);
  box-shadow: 0 18px 36px -16px rgba(29, 27, 34, .6);
}
.pack-title { display: flex; align-items: center; gap: 8px; font: 700 12px/1 var(--sans); color: #fff; margin-bottom: 8px; }
.folder { width: 16px; height: 12px; background: var(--accent); border-radius: 2px; position: relative; }
.folder::before { content: ""; position: absolute; left: 0; top: -3px; width: 7px; height: 4px; background: var(--accent); border-radius: 2px 2px 0 0; }
.pack ul { list-style: none; margin: 0; padding: 0; font: 11px/1.7 var(--mono); color: #bdb6c4; }
.pack li::before { content: "▸ "; color: var(--accent); }
.sheet figcaption { padding-left: 200px; }

/* Pains */
.pains { background: var(--ink); color: var(--paper); padding: 80px 0; }
.pains .kicker { color: var(--accent-soft); }
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 8px; }
.pain-grid article { border-top: 1px solid #4a4652; padding-top: 22px; }
.num { font: 600 13px/1 var(--mono); color: var(--accent); }
.pain-grid h3 { font-size: 24px; margin: 12px 0 10px; }
.pain-grid p { color: #bdb6c4; }

/* Steps */
.steps { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: s; }
.steps li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; position: relative; }
.steps li:not(:last-child)::after {
  content: "→"; position: absolute; right: -17px; top: 34px; z-index: 1;
  width: 24px; height: 24px; border-radius: 50%; background: var(--paper); color: var(--accent);
  display: grid; place-items: center; font-weight: 700; font-size: 14px;
}
.step-no { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-dark); font: 800 18px/1 var(--serif); margin-bottom: 18px; }
.steps h3 { font-size: 21px; margin-bottom: 8px; }
.steps p { color: var(--ink-2); font-size: 15px; }

/* Deliverables */
.deliver { background: var(--paper-2); }
.deliver-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.del-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.del-list li { display: flex; gap: 20px; align-items: flex-start; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; }
.del-list b { font: 900 44px/1 var(--serif); color: var(--accent); min-width: 36px; }
.del-list h3 { font-size: 19px; margin-bottom: 4px; }
.del-list p { color: var(--ink-2); font-size: 15px; }

/* Uses */
.use-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); overflow: hidden; }
.use-grid div { padding: 28px 24px; border-right: 1px solid var(--line); }
.use-grid div:last-child { border-right: 0; }
.use-grid h3 { font-size: 19px; margin-bottom: 8px; }
.use-grid p { color: var(--ink-2); font-size: 15px; }

/* Pricing */
.pricing { padding-top: 24px; }
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 44px; align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 28px; }
.plan.featured { border: 2px solid var(--accent); box-shadow: 0 24px 48px -28px rgba(200, 64, 47, .55); }
.badge { position: absolute; top: -13px; left: 28px; background: var(--accent); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 999px; }
.plan h3 { font-size: 20px; }
.price { font: 900 46px/1 var(--serif); margin: 18px 0 6px; }
.plan-sub { color: var(--muted); font-size: 14px; }
.plan ul { list-style: none; padding: 0; margin: 22px 0 28px; display: grid; gap: 10px; font-size: 15px; flex: 1; }
.plan li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 10px; }
.pay-note { text-align: center; color: var(--muted); font-size: 14px; margin-top: 24px; }

/* Order */
.order { background: var(--ink); color: var(--paper); }
.order .kicker { color: var(--accent-soft); }
.order .section-lead { color: #c9c2cf; }
.order-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 64px; align-items: start; }
.order-notes { margin: 28px 0 0; padding-left: 20px; color: #bdb6c4; display: grid; gap: 10px; font-size: 15px; }
.form { background: var(--card); color: var(--ink); border-radius: var(--radius); padding: 28px; display: grid; gap: 16px; }
.form label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form input:not([type=checkbox]), .form select, .form textarea {
  width: 100%; font: 400 15px/1.5 var(--sans); color: var(--ink);
  background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
}
.form textarea { resize: vertical; min-height: 120px; }
.form .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; color: var(--ink-2); font-size: 13.5px; }
.form .check input { margin-top: 4px; accent-color: var(--accent); width: 16px; height: 16px; flex: none; }
.form .invalid { border-color: var(--accent) !important; background: #fdf1ee !important; }
.form-msg { font-size: 14px; min-height: 1em; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-msg.ok { color: #2f6b3a; }
.form-msg.err { color: var(--accent-dark); }
.fallback { background: var(--paper); border: 1px dashed var(--line); border-radius: 10px; padding: 14px; font-size: 14px; display: grid; gap: 10px; }
.fallback pre { margin: 0; white-space: pre-wrap; font: 12.5px/1.6 var(--mono); color: var(--ink-2); max-height: 180px; overflow: auto; }

/* FAQ */
.faq-wrap { max-width: 820px; }
.faq details { border-bottom: 1px solid var(--line); padding: 20px 0; }
.faq summary { cursor: pointer; list-style: none; font: 700 19px/1.4 var(--serif); display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font: 400 24px/1 var(--sans); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--ink-2); margin-top: 12px; }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 36px 0; font-size: 14px; color: var(--muted); }
.footer-inner { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.footer .brand { font-size: 18px; color: var(--ink); }
.footer-meta { margin-left: auto; }

/* Responsive */
@media (max-width: 960px) {
  .hero-grid, .deliver-grid, .order-grid { grid-template-columns: 1fr; gap: 48px; }
  .sheet { transform: none; }
  .pack { left: auto; right: 12px; bottom: -100px; }
  .sheet figcaption { padding-left: 0; text-align: left; }
  .hero { padding-bottom: 150px; }
  .use-grid { grid-template-columns: 1fr 1fr; }
  .use-grid div:nth-child(2) { border-right: 0; }
  .use-grid div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .nav-links { display: none; }
  .nav-actions { margin-left: auto; }
}
@media (max-width: 720px) {
  section { padding: 72px 0; }
  .hero { padding-top: 40px; }
  .pain-grid, .steps, .plans { grid-template-columns: 1fr; }
  .steps li:not(:last-child)::after { content: "↓"; right: auto; left: 50%; top: auto; bottom: -17px; transform: translateX(-50%); }
  .sheet { padding: 20px 14px 14px; }
  .sheet-head { padding-right: 60px; flex-direction: column; align-items: flex-start; }
  .stamp { width: 52px; height: 52px; font-size: 14px; top: 14px; right: 14px; }
  .sheet-fields { grid-template-columns: 1fr 1fr; }
  .faces { grid-template-columns: repeat(3, 1fr); }
  .face img { width: 100%; height: auto; aspect-ratio: 1; max-width: 72px; margin-inline: auto; }
  .prompt { grid-column: 1 / -1; }
  .pack { position: static; transform: none; margin-top: 14px; }
  .case-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .cta-big { font-size: 19px; }
  .hero { padding-bottom: 72px; }
  .row2 { grid-template-columns: 1fr; }
  .use-grid { grid-template-columns: 1fr; }
  .use-grid div { border-right: 0; border-bottom: 1px solid var(--line); }
  .use-grid div:last-child { border-bottom: 0; }
  .footer-meta { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}