:root {
  --ink: #10271c;
  --muted: #58695f;
  --green: #19aa65;
  --green-dark: #087443;
  --forest: #073c29;
  --leaf: #e8f6eb;
  --mist: #f5fbf6;
  --line: #d8e8dc;
  --yellow: #ffd44f;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; letter-spacing: 0; }
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

.site-header { position: absolute; z-index: 30; top: 0; left: 50%; transform: translateX(-50%); width: min(calc(100% - 48px),1180px); height: 76px; padding: 0; display: flex; align-items: center; gap: 28px; border-bottom: 1px solid rgba(255,255,255,.14); color: #fff; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 21px; font-weight: 800; white-space: nowrap; }
.brand b { color: var(--green); }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.32); border-radius: 50%; background: transparent; color: #fff; font: 800 19px/1 Arial,sans-serif; }
nav { display: flex; gap: 34px; margin-left: auto; }
nav a { color: #c7d8cd; font-size: 13px; font-weight: 600; }
nav a:hover { color: #fff; }
.button { min-height: 54px; padding: 0 28px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; border-radius: 7px; background: var(--green); color: #fff; font-size: 17px; font-weight: 800; box-shadow: 0 10px 24px rgba(8,116,67,.22); transition: transform .2s ease, background .2s ease; }
.button:hover { background: var(--green-dark); transform: translateY(-2px); }
.button-small { min-height: 38px; padding: 0 17px; font-size: 13px; }

.hero { position: relative; min-height: 100vh; overflow: hidden; display: flex; flex-direction: column; align-items: center; padding: 132px 24px 72px; background: #050a08; color: #fff; }
.hero-grid { position: relative; z-index: 2; width: min(100%,1100px); display: grid; grid-template-columns: 1.35fr .65fr; gap: 72px; align-items: end; }
.hero-copy { min-width: 0; padding-left: 24px; border-left: 4px solid var(--green); }
.hero-kicker { margin: 0 0 18px; color: #78dda7; font: 800 12px/1.2 Arial,sans-serif; }
.hero h1 { margin: 0; font-size: clamp(46px,4.4vw,60px); line-height: 1.09; letter-spacing: 0; }
.hero h1 .hero-title-line { display: block; color: var(--green); white-space: nowrap; }
.hero h1 .hero-title-main { color: #fff; }
.hero-detail { padding-bottom: 3px; }
.hero-detail > p:first-child { margin: 0; color: #b8c9bf; font-size: 16px; line-height: 1.8; }
.hero-actions { position: relative; z-index: 2; margin-top: 24px; display: flex; align-items: center; gap: 20px; }
.secondary-link { padding: 9px 0; color: #d9e7de; border-bottom: 1px solid rgba(255,255,255,.36); font-weight: 800; }
.hero-meta { margin: 22px 0 0; display: flex; gap: 18px; color: #789085; font-size: 12px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta span::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--green); }
.product-stage { position: relative; z-index: 1; width: min(100%,1100px); margin-top: 48px; overflow: hidden; border: 1px solid rgba(255,255,255,.25); border-radius: 8px; background: #17231d; box-shadow: 0 0 48px rgba(25,170,101,.18); }
.stage-bar { height: 42px; padding: 0 16px; display: flex; align-items: center; gap: 7px; border-bottom: 1px solid rgba(255,255,255,.1); background: #121b17; color: #9fb2a7; font-size: 11px; }
.stage-bar > span { width: 9px; height: 9px; border-radius: 50%; background: #506159; }
.stage-bar > span:first-child { background: #ff755f; }
.stage-bar > span:nth-child(2) { background: var(--yellow); }
.stage-bar > span:nth-child(3) { background: var(--green); }
.stage-bar b { margin-left: 12px; font-weight: 600; }
.stage-bar i { margin-left: auto; color: #76dca5; font-style: normal; }
.stage-screen { aspect-ratio: 1514/852; overflow: hidden; background: var(--leaf); }
.hero-image { height: 100%; object-fit: contain; object-position: center; }

.section { max-width: var(--max); margin: 0 auto; padding: 108px 24px; }
.section-heading { max-width: 760px; margin-bottom: 46px; }
.section-heading.centered { margin-left: auto; margin-right: auto; text-align: center; }
.kicker { display: block; margin-bottom: 13px; color: var(--green-dark); font: 800 12px/1.2 Arial,sans-serif; }
h2 { margin: 0; font-size: clamp(32px,4vw,50px); line-height: 1.16; letter-spacing: 0; }
.section-heading p,.feature-copy > p { margin: 18px 0 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.wide-visual,.feature-visual { margin: 0; overflow: hidden; border-radius: 8px; background: var(--leaf); box-shadow: 0 20px 55px rgba(7,60,41,.12); }
.wide-visual,.feature-visual { aspect-ratio: 16/9; }
.wide-visual img,.feature-visual img { height: 100%; object-fit: cover; }

.steps { list-style: none; margin: 0; padding: 34px 0 0; display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--line); }
.steps li { padding: 24px 28px; display: flex; gap: 17px; background: #fff; }
.steps li > span { color: var(--green); font: 800 18px/1.4 Arial,sans-serif; }
.steps strong { font-size: 17px; }
.steps p { margin: 6px 0 0; color: var(--muted); font-size: 14px; line-height: 1.6; }

.feature-list { padding-top: 42px; }
.feature { padding: 74px 0; display: grid; grid-template-columns: .78fr 1.22fr; gap: 72px; align-items: center; border-top: 1px solid var(--line); }
.feature.reverse { grid-template-columns: 1.22fr .78fr; }
.feature.reverse .feature-copy { order: 2; }
.feature.reverse .feature-visual { order: 1; }
.feature-copy h2 { font-size: clamp(30px,3.5vw,46px); }
.text-action { display: inline-flex; gap: 8px; margin-top: 25px; padding-bottom: 5px; color: var(--green-dark); border-bottom: 1px solid #8ed8af; font-weight: 800; }
.checks { margin: 24px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; color: #40564a; font-size: 15px; }
.checks li::before { content: "✓"; margin-right: 10px; color: var(--green); font-weight: 900; }

.template-band { padding: 100px max(24px,calc((100vw - var(--max))/2)); background: var(--forest); color: #fff; }
.template-band .section-heading { max-width: 820px; }
.template-band .kicker { color: #72dfa7; }
.template-band p { color: #c8ded1; }
.template-band .wide-visual { box-shadow: 0 24px 68px rgba(3,28,18,.42); }

.custom { display: grid; grid-template-columns: 1.2fr .8fr; gap: 74px; align-items: center; }
.tags { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 9px; }
.tags span { padding: 9px 14px; border-radius: 5px; background: var(--leaf); color: var(--green-dark); font-size: 13px; font-weight: 700; }
.scenes { border-top: 1px solid var(--line); }
.scene-grid { margin-top: 38px; display: grid; grid-template-columns: repeat(4,1fr); border: 1px solid var(--line); }
.scene-grid article { padding: 28px 24px; border-right: 1px solid var(--line); }
.scene-grid article:last-child { border-right: 0; }
.scene-grid span { color: var(--green); font: 800 13px/1 Arial,sans-serif; }
.scene-grid h3 { margin: 15px 0 9px; font-size: 19px; }
.scene-grid p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

.closing { position: relative; width: min(calc(100% - 48px),1120px); aspect-ratio: 16/9; margin: 20px auto 100px; overflow: hidden; border-radius: 8px; box-shadow: 0 22px 60px rgba(7,60,41,.13); }
.closing img { height: 100%; object-fit: cover; }
.closing .button { position: absolute; left: 50%; bottom: 7%; transform: translateX(-50%); min-width: 230px; }
.closing .button:hover { transform: translate(-50%,-2px); }

footer { min-height: 190px; padding: 46px max(24px,calc((100vw - var(--max))/2)); display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 10px 30px; background: #071d14; color: #fff; }
footer p { margin: 0; color: #b8d0c1; font-size: 14px; text-align: right; }
footer .brand { grid-row: span 2; }
.copyright { font-size: 12px; }

@media (max-width:900px) {
  nav { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-detail { padding-left: 28px; }
  .feature,.feature.reverse,.custom { grid-template-columns: 1fr; gap: 35px; }
  .feature.reverse .feature-copy,.feature.reverse .feature-visual { order: initial; }
  .scene-grid { grid-template-columns: repeat(2,1fr); }
  .scene-grid article:nth-child(2) { border-right: 0; }
  .scene-grid article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width:600px) {
  .site-header { top: 0; width: calc(100% - 32px); height: 68px; padding: 0; gap: 12px; }
  .brand { font-size: 17px; }
  .brand-mark { width: 30px; height: 30px; font-size: 18px; }
  .button-small { min-height: 38px; padding: 0 12px; font-size: 12px; }
  .button-small span { display: none; }
  .hero { min-height: 0; padding: 104px 16px 48px; background: #050a08; }
  .hero-grid { gap: 24px; }
  .hero-copy { padding-left: 16px; border-left-width: 3px; }
  .hero h1 { font-size: clamp(24px,7.4vw,32px); line-height: 1.12; }
  .hero-detail { padding: 0 0 0 19px; }
  .hero-detail > p:first-child { font-size: 14px; line-height: 1.65; }
  .hero-actions { margin-top: 20px; padding: 0; align-items: stretch; flex-direction: column; gap: 5px; }
  .hero-actions .button { width: min(100%,330px); }
  .hero-actions .secondary-link { width: max-content; }
  .secondary-link { color: #d9e7de; border-color: rgba(255,255,255,.32); }
  .hero-meta { margin-top: 18px; gap: 11px; flex-wrap: wrap; }
  .product-stage { width: 100%; margin-top: 34px; }
  .stage-bar { height: 34px; padding: 0 10px; }
  .stage-bar b { margin-left: 6px; max-width: 150px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .stage-screen { aspect-ratio: 1514/852; }
  .hero-image { height: 100%; object-fit: contain; object-position: center; }
  .section { padding: 76px 18px; }
  .section-heading { margin-bottom: 30px; }
  h2,.feature-copy h2 { font-size: 30px; }
  .section-heading p,.feature-copy > p { font-size: 15px; line-height: 1.75; }
  .wide-visual,.feature-visual { border-radius: 5px; }
  .steps { grid-template-columns: 1fr; padding-top: 18px; }
  .steps li { padding: 18px; }
  .feature-list { padding-top: 18px; }
  .feature { padding: 58px 0; }
  .template-band { padding: 76px 18px; }
  .scene-grid { grid-template-columns: 1fr; }
  .scene-grid article { border-right: 0; border-bottom: 1px solid var(--line); }
  .scene-grid article:last-child { border-bottom: 0; }
  .closing { width: calc(100% - 36px); margin: 0 auto 72px; }
  .closing .button { bottom: 5%; width: calc(100% - 36px); min-width: 0; font-size: 14px; }
  footer { min-height: 220px; grid-template-columns: 1fr; text-align: left; }
  footer p { text-align: left; }
  footer .brand { grid-row: auto; }
}

@media (prefers-reduced-motion:no-preference) {
  .wide-visual,.feature-visual { animation: rise linear both; animation-timeline: view(); animation-range: entry 5% cover 30%; }
  @keyframes rise { from { opacity:.25; transform:translateY(24px); } to { opacity:1; transform:translateY(0); } }
}