:root {
  --green-900: #06342a;
  --green-800: #0b4536;
  --green-700: #0e4d3a;
  --green-600: #14795c;
  --green-500: #1aa06f;
  --gold: #d9a441;
  --ink: #14201c;
  --ink-2: #46564f;
  --ink-3: #7b8b84;
  --bg: #ffffff;
  --bg-soft: #f4f8f6;
  --line: #e3ebe7;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 18px 40px -24px rgba(6, 52, 42, .35);
  --max: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* 吸顶导航高度补偿，避免锚点跳转后标题被导航遮住 */
[id] { scroll-margin-top: 88px; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { line-height: 1.3; margin: 0; letter-spacing: -.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 860px; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--green-700); color: #fff; padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s, box-shadow .2s;
}
.nav.is-stuck { border-bottom-color: var(--line); box-shadow: 0 8px 24px -20px rgba(6, 52, 42, .4); }
.nav-inner { display: flex; align-items: center; gap: 28px; height: 68px; }

.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(140deg, var(--green-600), var(--green-800));
  color: #fff; font-size: 17px; font-weight: 700;
  box-shadow: 0 6px 14px -8px rgba(14, 77, 58, .9);
}
.logo-text { font-size: 18px; letter-spacing: .02em; }

.nav-links { display: flex; gap: 26px; margin-left: auto; font-size: 15px; color: var(--ink-2); }
.nav-links a { position: relative; padding: 4px 0; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: var(--green-600); transform: scaleX(0); transform-origin: left;
  transition: transform .22s ease;
}
.nav-links a:hover { color: var(--green-700); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-toggle {
  display: none; margin-left: auto;
  width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 10px;
  background: #fff; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 18px; height: 2px; margin: 3px auto;
  background: var(--ink); border-radius: 2px; transition: transform .2s, opacity .2s;
}
.nav.is-open .nav-toggle span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav.is-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav-toggle span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, var(--green-600), var(--green-800));
  color: #fff; box-shadow: 0 12px 24px -14px rgba(14, 77, 58, .85);
}
.btn-primary:hover { box-shadow: 0 16px 30px -12px rgba(14, 77, 58, .95); }
.btn-ghost { background: #fff; color: var(--green-700); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--green-600); }
.btn-light { background: #fff; color: var(--green-800); }
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-block { display: flex; width: 100%; }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding: 84px 0 96px; }
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg .grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(80% 60% at 50% 30%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(80% 60% at 50% 30%, #000 0%, transparent 75%);
  opacity: .7;
}
.blob { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .35; }
.blob-1 { width: 420px; height: 420px; background: #7ee0b8; top: -120px; left: -80px; }
.blob-2 { width: 380px; height: 380px; background: #ffd79a; bottom: -140px; right: -60px; }

.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
}
.tag {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: rgba(20, 121, 92, .1); color: var(--green-700);
  font-size: 13px; font-weight: 600; letter-spacing: .04em;
}
.hero h1 {
  margin: 18px 0 18px;
  font-size: clamp(34px, 5vw, 54px);
  letter-spacing: -.02em;
}
.hero .lead { font-size: 17px; color: var(--ink-2); max-width: 52ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 10px 22px; list-style: none;
  margin: 28px 0 0; padding: 0; font-size: 14px; color: var(--ink-3);
}
.hero-meta li { position: relative; padding-left: 16px; }
.hero-meta li::before {
  content: ""; position: absolute; left: 0; top: 10px;
  width: 7px; height: 7px; border-radius: 50%; background: var(--green-500);
}

/* chat mock */
.hero-card { display: flex; justify-content: center; }
.chat {
  width: 100%; max-width: 420px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); overflow: hidden;
}
.chat-head {
  display: flex; align-items: center; gap: 6px;
  padding: 14px 18px; background: var(--bg-soft); border-bottom: 1px solid var(--line);
}
.chat-head .dot { width: 9px; height: 9px; border-radius: 50%; background: #d7e2dd; }
.chat-title { margin-left: 10px; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.chat-body { padding: 20px 18px; display: flex; flex-direction: column; gap: 12px; background: #fff; }
.msg { max-width: 84%; padding: 12px 15px; font-size: 14.5px; border-radius: 16px; }
.msg-ai {
  align-self: flex-start; background: var(--bg-soft); color: var(--ink);
  border-bottom-left-radius: 6px;
}
.msg-me {
  align-self: flex-end; color: #fff;
  background: linear-gradient(135deg, var(--green-600), var(--green-800));
  border-bottom-right-radius: 6px;
}
.msg-typing { align-self: flex-start; display: flex; gap: 5px; padding: 14px 16px; background: var(--bg-soft); border-radius: 16px; }
.msg-typing span { width: 6px; height: 6px; border-radius: 50%; background: var(--green-500); animation: blink 1.2s infinite; }
.msg-typing span:nth-child(2) { animation-delay: .2s; }
.msg-typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 60%, 100% { opacity: .25; } 30% { opacity: 1; } }
.chat-foot {
  display: flex; align-items: center; gap: 10px; padding: 12px 14px;
  border-top: 1px solid var(--line); background: #fff;
}
.chat-input {
  flex: 1; padding: 9px 14px; border-radius: 999px; background: var(--bg-soft);
  font-size: 13.5px; color: var(--ink-3);
}
.chat-send {
  width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  background: var(--green-700); color: #fff; font-size: 15px;
}

/* ---------- sections ---------- */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-soft); }

.section-head { max-width: 640px; margin-bottom: 48px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .12em;
  color: var(--green-600); text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(26px, 3.2vw, 36px); }
.section-head p { margin-top: 14px; color: var(--ink-2); font-size: 16px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  padding: 30px 28px; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #cfe0d9; }
.card-icon {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center;
  background: rgba(20, 121, 92, .1); font-size: 22px; margin-bottom: 18px;
}
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--ink-2); font-size: 15px; }
.card-note {
  display: inline-block; margin-top: 16px; padding: 5px 12px; border-radius: 999px;
  background: var(--bg-soft); color: var(--ink-3); font-size: 12.5px;
}
.card-flat { background: var(--bg-soft); border-color: transparent; }
.cards-3 .card-flat { background: #fff; }

.split { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: start; }
.checklist { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 18px; }
.checklist li {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 20px 22px; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius);
}
.tick {
  flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  background: var(--green-600); color: #fff; font-size: 14px; font-weight: 700;
}
.checklist b { display: block; font-size: 16px; }
.checklist span { display: block; margin-top: 4px; color: var(--ink-2); font-size: 14.5px; }

.panel {
  padding: 30px 28px; border-radius: var(--radius-lg); color: #eaf5ef;
  background: linear-gradient(150deg, var(--green-700), var(--green-900));
  box-shadow: var(--shadow);
}
.panel h3 { font-size: 19px; margin-bottom: 12px; }
.panel p { font-size: 15px; color: rgba(234, 245, 239, .88); }
.panel .muted { color: rgba(234, 245, 239, .62); font-size: 13.5px; margin-top: 10px; }
.panel .btn { margin-top: 22px; }

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; counter-reset: step; }
.steps li { position: relative; padding: 28px 26px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.step-no {
  display: grid; place-items: center; width: 38px; height: 38px; border-radius: 12px;
  background: var(--green-700); color: #fff; font-weight: 700; margin-bottom: 16px;
}
.steps h3 { font-size: 18px; margin-bottom: 8px; }
.steps p { color: var(--ink-2); font-size: 15px; }

/* 第一步：横跨整行，左侧说明 + 右侧二维码，作为整段的视觉重点 */
.step-follow {
  grid-column: 1 / -1;
  display: grid; grid-template-columns: .92fr 1.08fr; gap: 40px;
  align-items: center; padding: 34px;
  border-color: #bcdccd;
  background: linear-gradient(180deg, #ffffff, #fbfdfc);
  box-shadow: 0 24px 48px -34px rgba(14, 77, 58, .55);
}
.step-follow .step-no { margin-bottom: 14px; }
.step-follow h3 { font-size: 21px; }
.step-copy { align-self: center; }
.steps .step-hint { margin-top: 12px; font-size: 14.5px; color: var(--ink-3); }
.step-qr { min-width: 0; }

.notice {
  margin-top: 28px; padding: 16px 20px; border-radius: var(--radius);
  background: rgba(217, 164, 65, .12); border: 1px solid rgba(217, 164, 65, .35);
  color: #7a5a15; font-size: 14.5px;
}

.faq { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.faq details { border-bottom: 1px solid var(--line); }
.faq details:last-child { border-bottom: 0; }
.faq summary {
  cursor: pointer; padding: 20px 24px; font-size: 16px; font-weight: 600;
  list-style: none; display: flex; justify-content: space-between; gap: 16px; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; flex: none; width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center; background: var(--bg-soft); color: var(--green-700);
  font-size: 17px; transition: transform .2s;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { padding: 0 24px 22px; color: var(--ink-2); font-size: 15px; }

/* ---------- 如何开始：三步 + 二维码 ---------- */
.follow-qr { margin: 0; }
.follow-qr img {
  display: block; width: 100%; height: auto;
  border-radius: 18px; box-shadow: 0 16px 34px -24px rgba(6, 52, 42, .5);
}
.follow-tips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 16px; }
.tip-chip {
  padding: 9px 16px; border-radius: 999px; background: #fff;
  border: 1px solid var(--line); font-size: 14px; color: var(--ink-2);
}

.cta { padding: 80px 0; background: linear-gradient(135deg, var(--green-700), var(--green-900)); color: #fff; }
.cta-inner { text-align: center; }
.cta h2 { font-size: clamp(26px, 3.4vw, 36px); }
.cta p { margin: 14px 0 28px; color: rgba(255, 255, 255, .8); }

/* ---------- footer ---------- */
.footer { background: #0a2119; color: #b9cbc3; padding: 56px 0 28px; font-size: 14.5px; }
.footer-inner { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; padding-bottom: 32px; border-bottom: 1px solid rgba(255, 255, 255, .1); }
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { max-width: 46ch; color: #93a9a0; }
.footer-links { display: flex; gap: 56px; justify-content: flex-end; }
.footer-links h4 { color: #fff; font-size: 14px; margin-bottom: 12px; letter-spacing: .04em; }
.footer-links a { display: block; padding: 4px 0; color: #93a9a0; }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: center;
  justify-content: space-between; padding-top: 22px;
}
.disclaimer { color: #7d918a; font-size: 13px; }
.icp { color: #93a9a0; font-size: 13px; letter-spacing: .02em; white-space: nowrap; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero-card { order: 2; }
  .cards { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  /* 第一步保持两侧并排，只是收紧留白；后两步仍是两列 */
  .step-follow { grid-template-columns: 1fr 1.05fr; gap: 28px; padding: 26px; }
  .section { padding: 68px 0; }
}

@media (max-width: 760px) {
  .nav-links {
    position: absolute; left: 0; right: 0; top: 68px;
    flex-direction: column; gap: 0; margin: 0; padding: 8px 24px 20px;
    background: #fff; border-bottom: 1px solid var(--line);
    display: none;
  }
  .nav.is-open .nav-links { display: flex; }
  .nav-links a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-links a::after { display: none; }
  .nav-toggle { display: block; }
  .nav-inner > .btn-primary { display: none; }
  /* 窄屏：三步全部单列，第一步内部改为上下堆叠 */
  .steps { grid-template-columns: 1fr; }
  .step-follow { grid-template-columns: 1fr; gap: 22px; padding: 24px 20px; }
  .step-qr .follow-qr { max-width: 460px; margin: 0 auto; }
  .follow-tips { margin-top: 14px; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; gap: 40px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}