/* ==========================================================================
   HyperFrames 中文官网 - 主样式表
   设计风格参考 OpenAI：克制高级、留白克制、字重对比、品牌色主导
   ========================================================================== */

:root {
  --brand: #10A37F;
  --brand-dark: #0E8C6C;
  --brand-soft: #E7F7F1;
  --ink-900: #0D0D0D;
  --ink-800: #1A1A1A;
  --ink-700: #2A2A2A;
  --ink-500: #6B7280;
  --ink-400: #9CA3AF;
  --ink-200: #E5E7EB;
  --ink-100: #F3F4F6;
  --ink-50: #F7F7F8;
  --bg: #FFFFFF;
  --warn: #FF6B6B;
  --max: 1280px;
  --pad: 24px;
  --r: 10px;
  --shadow-1: 0 1px 2px rgba(13,13,13,.04), 0 1px 1px rgba(13,13,13,.03);
  --shadow-2: 0 8px 24px rgba(13,13,13,.06), 0 2px 6px rgba(13,13,13,.04);
  --shadow-3: 0 24px 60px rgba(13,13,13,.10), 0 4px 12px rgba(13,13,13,.04);
  --t: cubic-bezier(.2,.7,.2,1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-800);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--brand); }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4, h5 { color: var(--ink-900); font-weight: 700; letter-spacing: -0.01em; margin: 0; }
h1 { font-size: clamp(40px, 6vw, 72px); line-height: 1.05; letter-spacing: -0.02em; }
h2 { font-size: clamp(30px, 4vw, 48px); line-height: 1.15; }
h3 { font-size: clamp(20px, 2.2vw, 26px); line-height: 1.3; }
p { margin: 0 0 1em; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section-soft { background: var(--ink-50); }
.eyebrow { color: var(--brand); font-weight: 600; font-size: 14px; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 12px; display: inline-block; }
.lead { color: var(--ink-500); font-size: 18px; line-height: 1.6; max-width: 720px; }

/* ===== 顶部导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--ink-200);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink-900); font-size: 18px; letter-spacing: -0.01em; }
.brand-mark { width: 28px; height: 28px; border-radius: 7px; background: linear-gradient(135deg, var(--brand) 0%, #0E8C6C 100%); position: relative; }
.brand-mark::after { content: ""; position: absolute; inset: 6px; border: 2px solid #fff; border-radius: 3px; }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a { color: var(--ink-700); padding: 8px 14px; border-radius: 8px; font-size: 15px; font-weight: 500; }
.nav-links a:hover { background: var(--ink-100); color: var(--ink-900); }
.nav-cta { background: var(--ink-900); color: #fff !important; padding: 9px 16px !important; border-radius: 8px; }
.nav-cta:hover { background: var(--brand); color: #fff !important; }
.hamburger { display: none; background: transparent; border: 0; width: 40px; height: 40px; border-radius: 8px; }
.hamburger:hover { background: var(--ink-100); }
.hamburger span { display: block; width: 20px; height: 2px; background: var(--ink-900); margin: 4px auto; }
.mobile-menu { display: none; position: fixed; inset: 64px 0 0 0; background: #fff; z-index: 49; padding: 24px; }
.mobile-menu.open { display: block; }
.mobile-menu a { display: block; padding: 14px 0; font-size: 18px; font-weight: 600; color: var(--ink-800); border-bottom: 1px solid var(--ink-200); }

/* ===== 按钮 ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 22px; border-radius: 8px; font-weight: 600; font-size: 15px; transition: all .2s var(--t); border: 1px solid transparent; line-height: 1; }
.btn-primary { background: var(--ink-900); color: #fff; }
.btn-primary:hover { background: #000; color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-2); }
.btn-brand { background: var(--brand); color: #fff; }
.btn-brand:hover { background: var(--brand-dark); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-2); }
.btn-ghost { background: transparent; color: var(--ink-900); border-color: var(--ink-200); }
.btn-ghost:hover { border-color: var(--ink-900); background: var(--ink-50); }
.btn-lg { padding: 16px 28px; font-size: 16px; }
.btn-sm { padding: 8px 14px; font-size: 13px; }

/* ===== 英雄区 ===== */
.hero { position: relative; padding: 80px 0 96px; overflow: hidden; background: radial-gradient(1200px 600px at 80% -10%, rgba(16,163,127,.10), transparent 60%), radial-gradient(800px 500px at 0% 100%, rgba(16,163,127,.06), transparent 60%), linear-gradient(180deg, #FBFBFB 0%, #FFFFFF 100%); }
.hero::before { content: ""; position: absolute; inset: 0; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.04 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>"); opacity: .5; pointer-events: none; }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px; align-items: center; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 24px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 18px; color: var(--ink-500); font-size: 13px; }
.hero-badges span { display: inline-flex; align-items: center; gap: 6px; }
.hero-badges .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--brand); }
.hero-visual { position: relative; aspect-ratio: 4/3; border-radius: 18px; background: linear-gradient(135deg, #0D0D0D 0%, #1A1A1A 100%); box-shadow: var(--shadow-3); overflow: hidden; }
.hero-visual::before { content: ""; position: absolute; inset: 0; background: radial-gradient(400px 200px at 70% 20%, rgba(16,163,127,.5), transparent 60%), radial-gradient(300px 300px at 20% 80%, rgba(16,163,127,.25), transparent 60%); }
.hero-visual::after { content: ""; position: absolute; inset: 0; background-image: linear-gradient(45deg, transparent 49%, rgba(255,255,255,.04) 49%, rgba(255,255,255,.04) 51%, transparent 51%); background-size: 24px 24px; opacity: .4; }
.hero-screen { position: absolute; inset: 28px; border-radius: 10px; background: linear-gradient(180deg, #0E0E0E 0%, #1A1A1A 100%); border: 1px solid rgba(255,255,255,.08); display: flex; flex-direction: column; }
.hero-screen-head { display: flex; gap: 6px; padding: 12px 16px; border-bottom: 1px solid rgba(255,255,255,.06); }
.hero-screen-head span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.18); }
.hero-screen-body { flex: 1; padding: 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hero-tile { background: linear-gradient(135deg, rgba(16,163,127,.15), rgba(255,255,255,.04)); border: 1px solid rgba(255,255,255,.06); border-radius: 8px; min-height: 90px; position: relative; overflow: hidden; }
.hero-tile::after { content: ""; position: absolute; inset: 0; background: radial-gradient(60px 60px at 30% 30%, rgba(16,163,127,.4), transparent); }
.hero-tile.b { background: linear-gradient(135deg, rgba(255,255,255,.06), rgba(16,163,127,.08)); }

/* ===== 网格卡片 ===== */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card { background: #fff; border: 1px solid var(--ink-200); border-radius: 14px; padding: 28px; transition: all .2s var(--t); }
.card:hover { border-color: var(--ink-900); transform: translateY(-2px); box-shadow: var(--shadow-2); }
.card h3 { margin: 0 0 8px; font-size: 20px; }
.card p { color: var(--ink-500); font-size: 15px; margin: 0; }
.card .icon { width: 44px; height: 44px; border-radius: 10px; background: var(--brand-soft); color: var(--brand-dark); display: inline-flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.card .icon svg { width: 22px; height: 22px; }
.card-link { color: var(--ink-900); font-weight: 600; font-size: 14px; display: inline-flex; gap: 4px; align-items: center; margin-top: 14px; }
.card-link::after { content: "→"; transition: transform .2s var(--t); }
.card-link:hover { color: var(--brand); }
.card-link:hover::after { transform: translateX(3px); }

/* ===== 快速入口 ===== */
.quick { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.quick a { display: flex; align-items: center; gap: 14px; padding: 22px; border-radius: 12px; background: #fff; border: 1px solid var(--ink-200); font-weight: 600; color: var(--ink-900); }
.quick a:hover { border-color: var(--ink-900); }
.quick a span { width: 36px; height: 36px; border-radius: 8px; background: var(--ink-900); color: #fff; display: inline-flex; align-items: center; justify-content: center; }
.quick a:hover span { background: var(--brand); }

/* ===== 会员价格 ===== */
.price { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.price .card { position: relative; }
.price .card.feature { border-color: var(--ink-900); box-shadow: var(--shadow-2); }
.price .card.feature::before { content: "最受欢迎"; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--ink-900); color: #fff; font-size: 12px; padding: 4px 12px; border-radius: 100px; font-weight: 600; }
.price .num { font-size: 44px; font-weight: 800; letter-spacing: -0.03em; color: var(--ink-900); font-family: "SFMono-Regular", Menlo, Consolas, monospace; }
.price .num small { font-size: 16px; color: var(--ink-500); font-weight: 500; }
.price ul { list-style: none; padding: 0; margin: 18px 0; }
.price ul li { padding: 6px 0; color: var(--ink-700); font-size: 14px; display: flex; align-items: flex-start; gap: 8px; }
.price ul li::before { content: "✓"; color: var(--brand); font-weight: 800; }

/* ===== 模型卡 ===== */
.models { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.model { position: relative; aspect-ratio: 16/10; border-radius: 14px; overflow: hidden; border: 1px solid var(--ink-200); }
.model .grad { position: absolute; inset: 0; }
.model:nth-child(1) .grad { background: linear-gradient(135deg, #0D0D0D 0%, #10A37F 100%); }
.model:nth-child(2) .grad { background: linear-gradient(135deg, #0D0D0D 0%, #4A90E2 100%); }
.model:nth-child(3) .grad { background: linear-gradient(135deg, #0D0D0D 0%, #FF6B6B 100%); }
.model:nth-child(4) .grad { background: linear-gradient(135deg, #0D0D0D 0%, #8B5CF6 100%); }
.model:nth-child(5) .grad { background: linear-gradient(135deg, #0D0D0D 0%, #F59E0B 100%); }
.model:nth-child(6) .grad { background: linear-gradient(135deg, #0D0D0D 0%, #06B6D4 100%); }
.model .label { position: absolute; inset: auto 0 0 0; padding: 18px; color: #fff; background: linear-gradient(180deg, transparent, rgba(0,0,0,.7)); }
.model .label h4 { color: #fff; font-size: 18px; margin-bottom: 4px; }
.model .label p { color: rgba(255,255,255,.78); font-size: 13px; margin: 0; }

/* ===== 时间线 ===== */
.timeline { position: relative; padding-left: 32px; }
.timeline::before { content: ""; position: absolute; left: 9px; top: 0; bottom: 0; width: 2px; background: var(--ink-200); }
.tl-item { position: relative; padding: 0 0 36px; }
.tl-item::before { content: ""; position: absolute; left: -32px; top: 6px; width: 20px; height: 20px; border-radius: 50%; background: #fff; border: 4px solid var(--brand); }
.tl-year { font-family: "SFMono-Regular", Menlo, Consolas, monospace; color: var(--brand); font-weight: 700; font-size: 14px; letter-spacing: .04em; }
.tl-title { font-size: 20px; font-weight: 700; color: var(--ink-900); margin: 4px 0 6px; }
.tl-desc { color: var(--ink-500); font-size: 15px; margin: 0; }

/* ===== FAQ ===== */
.faq-item { border-bottom: 1px solid var(--ink-200); }
.faq-item summary { padding: 22px 0; font-weight: 600; font-size: 18px; color: var(--ink-900); cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 24px; color: var(--ink-500); transition: transform .2s var(--t); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding: 0 0 22px; color: var(--ink-500); margin: 0; max-width: 820px; }

/* ===== 页脚 ===== */
.footer { background: #0D0D0D; color: #B5B5B5; padding: 64px 0 32px; margin-top: 64px; }
.footer .grid-4 { gap: 40px; }
.footer h5 { color: #fff; font-size: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 16px; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer ul li { margin-bottom: 8px; }
.footer a { color: #B5B5B5; font-size: 14px; }
.footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #2A2A2A; padding-top: 24px; margin-top: 48px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; color: #6B7280; font-size: 13px; }

/* ===== 弹窗 ===== */
.modal { position: fixed; inset: 0; z-index: 100; display: none; align-items: center; justify-content: center; padding: 20px; background: rgba(13,13,13,.6); backdrop-filter: blur(4px); }
.modal.open { display: flex; }
.modal-card { background: #fff; border-radius: 16px; max-width: 420px; width: 100%; padding: 32px; position: relative; box-shadow: var(--shadow-3); text-align: center; }
.modal-card h3 { font-size: 22px; margin-bottom: 8px; }
.modal-card p { color: var(--ink-500); font-size: 14px; margin-bottom: 20px; }
.modal-card img { width: 220px; height: 220px; margin: 0 auto 16px; border-radius: 12px; }
.modal-close { position: absolute; top: 12px; right: 12px; background: var(--ink-100); border: 0; width: 32px; height: 32px; border-radius: 50%; font-size: 20px; line-height: 1; color: var(--ink-700); }
.modal-close:hover { background: var(--ink-200); }

/* ===== 教程步骤 ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step { position: relative; padding: 28px; border-radius: 12px; background: #fff; border: 1px solid var(--ink-200); }
.step::before { counter-increment: step; content: counter(step, decimal-leading-zero); font-family: "SFMono-Regular", Menlo, Consolas, monospace; color: var(--brand); font-weight: 800; font-size: 14px; }
.step h4 { font-size: 18px; margin: 12px 0 6px; }
.step p { color: var(--ink-500); font-size: 14px; margin: 0; }

/* ===== 场景卡 ===== */
.scene { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.scene a { position: relative; aspect-ratio: 4/5; border-radius: 14px; overflow: hidden; display: flex; align-items: flex-end; padding: 18px; color: #fff; font-weight: 700; font-size: 17px; }
.scene a::before { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, #0D0D0D 0%, #10A37F 140%); }
.scene a::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,.7)); }
.scene a span { position: relative; }
.scene a:hover::before { transform: scale(1.05); }
.scene a::before { transition: transform .3s var(--t); }

/* ===== 通用 ===== */
.crumbs { font-size: 13px; color: var(--ink-500); margin-bottom: 24px; }
.crumbs a { color: var(--ink-500); }
.crumbs a:hover { color: var(--ink-900); }
.crumbs span { margin: 0 8px; color: var(--ink-400); }
.toc { position: sticky; top: 88px; padding: 24px; background: #fff; border: 1px solid var(--ink-200); border-radius: 12px; }
.toc h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-500); margin-bottom: 12px; }
.toc ul { list-style: none; padding: 0; margin: 0; }
.toc ul li { padding: 6px 0; font-size: 14px; }
.toc ul li a { color: var(--ink-700); }
.toc ul li a:hover { color: var(--brand); }
.split { display: grid; grid-template-columns: 240px 1fr; gap: 40px; }
table.params { width: 100%; border-collapse: collapse; }
table.params th, table.params td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--ink-200); font-size: 14px; }
table.params th { background: var(--ink-50); color: var(--ink-700); font-weight: 600; }
table.params td.num { font-family: "SFMono-Regular", Menlo, Consolas, monospace; color: var(--ink-900); font-weight: 600; }
.factbox { background: var(--ink-50); border: 1px solid var(--ink-200); border-radius: 12px; padding: 20px 24px; margin: 24px 0; }
.factbox h4 { font-size: 13px; text-transform: uppercase; color: var(--ink-500); letter-spacing: .08em; margin-bottom: 10px; }
.factbox ul { margin: 0; padding-left: 18px; }
.factbox ul li { font-size: 14px; color: var(--ink-700); margin-bottom: 4px; }

/* 滚动揭示 */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s var(--t), transform .6s var(--t); }
.reveal.in { opacity: 1; transform: none; }

/* 响应式 */
@media (max-width: 1024px) {
  .grid-3, .grid-4, .models, .price, .scene, .steps, .quick { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { aspect-ratio: 16/10; }
  .split { grid-template-columns: 1fr; }
  .toc { position: static; }
}
@media (max-width: 720px) {
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .hamburger { display: block; }
  .grid-3, .grid-4, .models, .price, .scene, .steps, .quick { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 64px; }
  .container { padding: 0 18px; }
}