:root {
  --ink: #1d1d1f;
  --ink-soft: #4c5968;
  --navy: #253d52;
  --navy-deep: #172b3c;
  --blue: #0066ff;
  --blue-deep: #0052cc;
  --blue-soft: #e8f1ff;
  --blue-soft2: #6ea8e8;
  --cream: #f6f8fb;
  --paper: #ffffff;
  --line: #e5e7eb;
  --muted: #868a93;
  --shadow: 0 20px 50px rgba(15, 60, 130, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 16px; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
.shell { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }

.site-header { border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .85); position: sticky; top: 0; z-index: 20; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }
.nav-wrap { min-height: 72px; display: flex; align-items: center; gap: 30px; }
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-icon { width: 34px; height: 34px; display: block; flex: none; }
.brand-text { font-size: 21px; font-weight: 700; letter-spacing: -.02em; line-height: 1; color: var(--ink); }
.main-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; font-size: 15px; color: var(--ink-soft); }
.main-nav a, .footer-inner a { transition: color .2s ease; }
.main-nav a:hover, .footer-inner a:hover { color: var(--blue); }
.nav-action { color: #fff; background: var(--blue); border-radius: 10px; padding: 10px 18px; font-size: 14px; font-weight: 600; }
.nav-action:hover { background: var(--blue-deep); }

.hero { display: grid; grid-template-columns: minmax(0, .9fr) minmax(500px, 1.1fr); gap: 64px; align-items: center; padding-top: 96px; padding-bottom: 110px; }
.eyebrow { margin: 0 0 18px; color: var(--blue); font-size: 12px; letter-spacing: .16em; font-weight: 700; }
.eyebrow-line { display: inline-block; width: 28px; height: 2px; background: var(--blue); vertical-align: middle; margin: 0 10px 3px 0; }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-weight: 800; letter-spacing: -.03em; line-height: 1.1; }
h1 { font-size: clamp(44px, 5.4vw, 70px); max-width: 640px; margin-bottom: 24px; }
h1 em, h2 em { color: var(--blue); font-style: normal; }
.hero-lead { color: var(--ink-soft); max-width: 520px; font-size: 18px; line-height: 1.75; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 32px 0 20px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 50px; padding: 0 22px; border-radius: 12px; font-size: 15px; font-weight: 600; }
.button-primary { color: #fff; background: var(--blue); }
.button-primary:hover { background: var(--blue-deep); }
.button-quiet { color: var(--ink); border: 1px solid var(--line); background: #fff; }
.button-quiet:hover { border-color: var(--blue); color: var(--blue); }
.hero-note { color: var(--muted); font-size: 13px; }
.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: #22a06b; margin: 0 8px 1px 0; }

.hero-art { min-width: 0; }
.mirror-stage { position: relative; }
.mirror-window { border-radius: 16px; background: #0e1c28; box-shadow: var(--shadow); overflow: hidden; }
.mirror-topbar { height: 40px; padding: 0 16px; display: flex; align-items: center; gap: 7px; color: #9eb2c2; background: var(--navy-deep); font: 13px ui-monospace, SFMono-Regular, Consolas, monospace; }
.mirror-topbar span { width: 10px; height: 10px; border-radius: 50%; background: #668196; }
.mirror-topbar span:first-child { background: #e27a56; }
.mirror-topbar span:nth-child(2) { background: #e8c15a; }
.mirror-topbar span:nth-child(3) { background: #5aa982; }
.mirror-topbar code { margin-left: 10px; }
.mirror-body { position: relative; min-height: 300px; display: grid; place-items: center; padding: 34px 42px; background: linear-gradient(180deg, #12283a, #0e1c28); }
.mirror-phone { position: absolute; top: 40px; right: 54px; width: 74px; height: 118px; border: 2px solid #2a4a63; border-radius: 10px; background: #1b3347; box-shadow: 0 12px 30px rgba(0,0,0,.4); }
.mirror-phone::before { content: ""; position: absolute; top: -13px; left: 26px; width: 22px; height: 6px; border-radius: 3px; background: #2a4a63; }
.mirror-phone .phone-screen { position: absolute; inset: 7px; border-radius: 5px; background: #f6f2e9; display: grid; gap: 3px; padding: 6px; grid-template-columns: repeat(3, 1fr); }
.mirror-phone .app-dot { border-radius: 2px; background: #cdd7dd; }
.mirror-phone .app-dot.blue { background: var(--blue); }
.mirror-phone .app-dot.orange { background: #e46f3f; }
.wave-path { position: absolute; top: 92px; right: 132px; width: 120px; height: 60px; border-top: 2px dashed var(--blue-soft2); border-radius: 50% 50% 0 0; opacity: .7; }
.model-screen { width: 100%; max-width: 360px; border-radius: 6px; background: #111f2b; border: 1px solid #24405a; overflow: hidden; }
.model-screen-head { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; color: #8ba4b8; font: 10px ui-monospace, monospace; }
.model-screen-head b { color: #dbe7ee; }
.model-app { height: 150px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; padding: 12px; }
.model-app i { border-radius: 4px; background: #26445c; }
.model-app i.hot { background: var(--blue); }
.stage-caption { display: flex; align-items: center; gap: 9px; margin-top: 14px; color: var(--muted); font-size: 13px; }
.stage-caption .caption-key { padding: 4px 8px; border-radius: 6px; color: var(--blue); background: var(--blue-soft); font: 11px ui-monospace, monospace; }

.section-rule { border-top: 1px solid var(--line); }
.workflow { padding: 96px 0 104px; background: var(--cream); }
.split-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: end; }
.section-heading { margin-bottom: 54px; }
.split-heading h2, .section-heading h2, .install h2 { font-size: clamp(34px, 4vw, 54px); margin-bottom: 0; }
.section-intro { max-width: 400px; margin-bottom: 4px; color: var(--ink-soft); font-size: 17px; }
.workflow-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-top: 64px; }
.workflow-step { min-height: 180px; padding: 18px 24px 22px 0; border-top: 2px solid var(--line); }
.step-number { display: block; color: var(--blue); font: 700 14px ui-monospace, SFMono-Regular, Consolas, monospace; margin-bottom: 22px; }
.workflow-step h3 { color: var(--ink); font-size: 21px; font-weight: 700; margin-bottom: 12px; }
.workflow-step p { max-width: 285px; color: var(--ink-soft); font-size: 15px; }

.features { padding: 100px 0 110px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card { position: relative; display: flex; flex-direction: column; gap: 12px; min-height: 200px; padding: 30px 28px; border: 1px solid var(--line); border-radius: 16px; background: #fff; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(15, 60, 130, .1); border-color: #d5e5ff; }
.feature-index { flex: none; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .1em; }
.feature-card h3 { margin-bottom: 8px; font-size: 21px; font-weight: 700; }
.feature-card p { margin-bottom: 0; color: var(--ink-soft); font-size: 14.5px; }
.feature-mark { position: absolute; right: 22px; bottom: 16px; color: var(--blue); font-size: 26px; line-height: 1; }

.install { padding: 96px 0 108px; background: var(--cream); }
.install-inner { display: grid; grid-template-columns: 1fr 380px; gap: 80px; align-items: center; }
.install-copy { max-width: 490px; margin-top: 24px; color: var(--ink-soft); }
.install-card { padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.install-card-head { display: flex; align-items: center; gap: 14px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.install-card-head img { width: 42px; height: 42px; border-radius: 10px; }
.install-card-head strong, .install-card-head span { display: block; }
.install-card-head strong { font-size: 18px; }
.install-card-head span { color: var(--muted); font-size: 12px; }
.install-link { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 15px 0; border-bottom: 1px solid var(--line); font-size: 14px; color: var(--ink); }
.install-link:hover { color: var(--blue); }
.install-link b, .install-link small { display: block; }
.install-link small { color: var(--muted); font-size: 11px; }
.install-footnote { color: var(--muted); margin: 19px 0 0; font-size: 12px; }

.site-footer { color: var(--ink-soft); background: var(--cream); border-top: 1px solid var(--line); }
.footer-inner { min-height: 96px; display: flex; align-items: center; gap: 22px; font-size: 13px; }
.footer-brand .brand-icon { width: 28px; height: 28px; }
.footer-brand .brand-text { color: var(--ink); font-size: 19px; }
.footer-inner nav { display: flex; gap: 20px; margin-left: auto; }
.footer-inner nav a { color: var(--ink-soft); }
.footer-inner > span:last-child { color: var(--muted); }

@media (max-width: 940px) {
  .hero { grid-template-columns: 1fr; gap: 56px; padding-top: 72px; }
  .hero-copy { max-width: 650px; }
  .hero-art { max-width: 760px; width: 100%; }
  .install-inner { grid-template-columns: 1fr 340px; gap: 45px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .shell { width: min(100% - 32px, 560px); }
  .site-header { position: static; }
  .nav-wrap { min-height: 64px; gap: 16px; }
  .brand-icon { width: 26px; height: 26px; }
  .main-nav { display: none; }
  .nav-action { margin-left: auto; padding: 8px 13px; font-size: 13px; }
  .hero { padding-top: 56px; padding-bottom: 72px; }
  .hero h1 { font-size: clamp(38px, 12vw, 54px); }
  .hero-lead { font-size: 16px; }
  .mirror-body { min-height: 240px; padding: 26px; }
  .mirror-phone { right: 20px; transform: scale(.8); transform-origin: top right; }
  .wave-path { display: none; }
  .split-heading, .install-inner { grid-template-columns: 1fr; gap: 24px; }
  .workflow, .features, .install { padding: 68px 0 76px; }
  .workflow-steps { grid-template-columns: 1fr; gap: 0; margin-top: 40px; }
  .workflow-step { min-height: 0; padding: 18px 0 22px; }
  .section-heading { margin-bottom: 36px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 160px; }
  .install-card { width: 100%; }
  .footer-inner { min-height: 0; padding: 28px 0; flex-wrap: wrap; gap: 13px 18px; }
  .footer-inner nav { width: 100%; order: 3; margin-left: 0; }
  .footer-inner > span:last-child { margin-left: auto; }
}
.fade-in { opacity: 0; transform: translateY(28px); transition: opacity .7s cubic-bezier(.22, .61, .36, 1), transform .7s cubic-bezier(.22, .61, .36, 1); }
.fade-in.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition-duration: 0s !important; animation-duration: 0s !important; } .fade-in { opacity: 1; transform: none; } }