:root {
  color-scheme: light dark;
  --bg: #f2f5f0;
  --surface: #fbfcf9;
  --surface-strong: #ffffff;
  --surface-soft: #e6eee8;
  --ink: #16352e;
  --ink-soft: #52665f;
  --line: #ccd8d0;
  --brand: #176b5b;
  --brand-strong: #0d4d42;
  --brand-soft: #dcebe3;
  --accent: #e7bd55;
  --accent-ink: #3a2a08;
  --shadow: 0 24px 70px rgba(18, 63, 52, .14);
  --radius: 16px;
  --max: 1180px;
  --intro-sidebar-width: 168px;
  --font-ui-family: "Microsoft YaHei", "微软雅黑", "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font-ui-family);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font-family: inherit; }
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 85% 8%, rgba(231, 189, 85, .14), transparent 25rem),
    radial-gradient(circle at 6% 40%, rgba(23, 107, 91, .08), transparent 34rem);
}
a { color: inherit; }
img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
}
figure, h1, h2, h3, p { margin: 0; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -60px;
  z-index: 30;
  padding: 10px 16px;
  border-radius: 999px;
  color: #f8fbf9;
  background: var(--brand-strong);
}
.skip-link:focus { top: 12px; }

.intro-page {
  min-width: 0;
  min-height: 100vh;
  margin-left: var(--intro-sidebar-width);
}
.intro-sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 30;
  width: var(--intro-sidebar-width);
  height: 100vh;
  padding: 18px 14px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #f7fbf9;
  background: #153c34;
}
.intro-side-brand {
  width: 88px;
  height: 50px;
  flex: none;
  margin-bottom: 16px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  color: #25463e;
  background: #f1c85b;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: .08em;
  text-decoration: none;
}
.intro-sidebar nav {
  width: 100%;
  min-height: 0;
  flex: 1;
  display: grid;
  align-content: start;
  gap: 5px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: #ffffff3d transparent;
}
.intro-nav-item,
.nav-group-title {
  min-height: 34px;
  padding: 8px 6px;
  display: grid;
  align-items: center;
  justify-items: start;
  border-radius: 10px;
  color: #a9c3bc;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.2;
  text-align: left;
  text-decoration: none;
  white-space: nowrap;
}
.nav-group { display: contents; }
.nav-group:not(:has(> a:not([hidden]))) { display: none; }
@media (min-width: 901px) {
  .intro-nav-item.nav-item-child {
    padding-inline-start: calc(6px + 2em);
    font-size: 11px;
  }
}
.intro-nav-item:hover,
.intro-nav-item.active {
  color: #fff;
  background: #ffffff1f;
}
.intro-side-foot {
  flex: none;
  margin-top: auto;
  padding-top: 10px;
  color: #9eb9b2;
  font-size: 10px;
  line-height: 1.35;
  text-align: center;
}
.intro-side-foot i {
  width: 7px;
  height: 7px;
  margin-right: 6px;
  display: inline-block;
  border-radius: 50%;
  background: #63d5a8;
  box-shadow: 0 0 0 4px #63d5a81f;
}

.intro-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
}
.intro-brand span {
  width: auto;
  min-width: 54px;
  height: 30px;
  padding-inline: 10px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: var(--accent-ink);
  background: var(--accent);
  font-weight: 800;
}
.intro-brand strong { font-size: 17px; letter-spacing: -.02em; }
.primary-cta {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 750;
  text-decoration: none;
  transition: transform .2s ease, background-color .2s ease, border-color .2s ease;
}
.primary-cta { color: #f7fbf9; background: var(--brand); }
.primary-cta:hover { transform: translateY(-2px); }
.primary-cta:active { transform: translateY(1px); }
a:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 82%, transparent); outline-offset: 3px; }

main > section, footer { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.hero {
  min-height: 100dvh;
  padding: 54px 0 64px;
  display: grid;
  grid-template-columns: .86fr 1.14fr;
  align-items: center;
  gap: 62px;
}
.hero-copy { max-width: 530px; }
.hero-kicker {
  width: max-content;
  margin-bottom: 20px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--brand);
  background: var(--surface);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .12em;
}
.hero h1 {
  max-width: 12em;
  font-size: clamp(40px, 3.6vw, 52px);
  line-height: 1.08;
  letter-spacing: -.055em;
}
.hero-lead {
  max-width: 25em;
  margin-top: 24px;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.75;
}
.hero-actions { display: flex; gap: 12px; margin-top: 30px; }
.hero-visual { position: relative; padding: 28px 20px 58px 62px; }
.hero-visual > img:first-child {
  width: 100%;
  height: auto;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-phone {
  position: absolute;
  left: 0;
  bottom: 16px;
  width: 27%;
  height: auto;
  object-fit: contain;
  min-width: 122px;
  border: 5px solid var(--ink);
  border-radius: 30px;
  box-shadow: 0 20px 52px rgba(12, 49, 41, .28);
}
.hero-visual figcaption {
  position: absolute;
  right: 18px;
  bottom: 20px;
  max-width: 58%;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.6;
}

.proof-strip {
  padding: 28px 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.proof-strip article { padding: 4px 30px; border-left: 1px solid var(--line); }
.proof-strip article:first-child { padding-left: 0; border-left: 0; }
.proof-strip strong { display: block; color: var(--brand); font-size: clamp(34px, 5vw, 58px); line-height: 1; letter-spacing: -.05em; }
.proof-strip span { display: block; margin-top: 10px; color: var(--ink-soft); font-size: 14px; }

.challenge-section, .delivery-section { padding-top: 120px; }
#evidence, #delivery { scroll-margin-top: 0; }
.challenge-section {
  min-height: calc(100dvh - 88px);
  padding-top: 32px;
  padding-bottom: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.section-heading { max-width: 820px; margin-bottom: 44px; }
.section-heading > p:first-child {
  margin-bottom: 16px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .12em;
}
.section-heading h2, .evidence-heading h2 {
  font-size: clamp(32px, 4.1vw, 54px);
  line-height: 1.15;
  letter-spacing: -.045em;
}
.challenge-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.challenge-card {
  min-height: 300px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.challenge-card:nth-child(3), .challenge-card:nth-child(4) { grid-column: auto; grid-row: auto; }
.challenge-field {
  color: #f4faf7;
  border-color: transparent;
  background: linear-gradient(140deg, #103f35, #1d6f5e);
}
.challenge-data { background: color-mix(in srgb, var(--accent) 18%, var(--surface)); }
.challenge-card > span { color: var(--brand); font-size: 13px; font-weight: 800; }
.challenge-field > span { color: #bfe5d8; }
.challenge-card h3 { max-width: 16em; margin-top: 18px; font-size: 23px; line-height: 1.25; letter-spacing: -.03em; }
.challenge-card p { max-width: 34em; margin-top: 14px; color: var(--ink-soft); font-size: 14px; line-height: 1.65; }
.challenge-field p { color: #d7e8e2; }
.challenge-card b { margin-top: auto; padding-top: 18px; color: var(--brand); font-size: 13px; }
.challenge-field b { color: #f0c96e; }

.interface-evidence {
  width: 100%;
  max-width: none;
  margin-top: 120px;
  padding: 72px max(20px, calc((100% - var(--max)) / 2));
  color: #eef7f3;
  background: #143f36;
}
.evidence-heading { max-width: 760px; }
.evidence-heading p { margin-top: 14px; color: #c7dcd5; font-size: 16px; line-height: 1.7; }
.evidence-tabs {
  width: min(420px, 100%);
  margin-top: 28px;
  padding: 5px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 5px;
  border: 1px solid rgba(218, 238, 230, .28);
  border-radius: 14px;
  background: rgba(255, 255, 255, .06);
}
.evidence-tabs button {
  min-height: 46px;
  border: 0;
  border-radius: 10px;
  color: #c7dcd5;
  background: transparent;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
.evidence-tabs button.active {
  color: var(--accent-ink);
  background: var(--accent);
}
.evidence-tabs button:focus-visible { outline: 3px solid rgba(241, 200, 91, .46); outline-offset: 2px; }
.evidence-panel { margin-top: 34px; }
.evidence-panel[hidden] { display: none !important; }
.evidence-layout {
  display: grid;
  grid-template-columns: .74fr 1.26fr;
  align-items: center;
  gap: 70px;
}
.evidence-copy h3 { max-width: 15em; font-size: clamp(28px, 3vw, 42px); line-height: 1.18; letter-spacing: -.035em; }
.evidence-copy p { margin-top: 20px; color: #c7dcd5; font-size: 16px; line-height: 1.8; }
.terminal-capabilities {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 7px;
}
.terminal-capabilities span {
  min-height: 34px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  border: 1px solid rgba(218, 238, 230, .17);
  border-radius: 9px;
  color: #e1eee9;
  background: rgba(255, 255, 255, .055);
  font-size: 12px;
  line-height: 1.35;
}
.terminal-entry { margin-top: 16px; }
.mini-entry {
  width: min(100%, 340px);
  padding: 8px;
  border-radius: 12px;
  color: var(--ink);
  background: #f8faf7;
}
.mini-entry img { width: 100%; height: auto; object-fit: contain; border-radius: 8px; }
.mini-entry figcaption { padding-top: 6px; color: #52665f; font-size: 11px; text-align: center; }
.web-entry { display: flex; justify-content: flex-start; }
.web-entry .primary-cta { color: var(--accent-ink); background: var(--accent); }
.web-admin-cta { white-space: nowrap; }
.phone-gallery { display: grid; grid-template-columns: repeat(3, 1fr); align-items: start; gap: 18px; }
.phone-gallery figure { min-width: 0; }
.phone-gallery img {
  width: 100%;
  height: auto;
  object-fit: contain;
  border: 5px solid #0b2923;
  border-radius: 28px;
  box-shadow: 0 24px 60px rgba(3, 20, 16, .34);
}
.phone-gallery .phone-offset { padding-top: 54px; }
.phone-gallery figcaption { padding: 16px 4px 0; }
.phone-gallery figcaption strong, .phone-gallery figcaption span { display: block; }
.phone-gallery figcaption span { margin-top: 6px; color: #b9d0c8; font-size: 13px; line-height: 1.6; }

.web-gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; gap: 26px; }
.web-gallery figure { min-width: 0; align-self: start; }
.web-gallery a { display: block; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: 0 16px 48px rgba(18, 63, 52, .1); }
.web-gallery img {
  width: 100%;
  height: auto;
  object-fit: contain;
}
.web-gallery figcaption { padding-top: 16px; }
.web-gallery figcaption strong, .web-gallery figcaption span { display: block; }
.web-gallery figcaption strong { font-size: 18px; }
.web-gallery figcaption span { margin-top: 7px; color: var(--ink-soft); font-size: 14px; line-height: 1.7; }
.evidence-web-layout { grid-template-columns: .58fr 1.42fr; align-items: start; }
.interface-evidence .web-gallery a { border-color: rgba(218, 238, 230, .24); background: #f8faf7; }
.interface-evidence .web-gallery figcaption strong { color: #eef7f3; }
.interface-evidence .web-gallery figcaption span { color: #b9d0c8; }

.delivery-table { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.delivery-row { display: grid; grid-template-columns: .62fr 1.28fr 1fr; gap: 24px; padding: 21px 24px; align-items: center; }
.delivery-row + .delivery-row { border-top: 1px solid var(--line); }
.delivery-row span { color: var(--ink-soft); line-height: 1.6; }
.delivery-head { color: #eff7f4; background: var(--brand-strong); font-weight: 750; }
.delivery-head span { color: inherit; }

footer {
  min-height: 116px;
  padding: 26px 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
  border-top: 1px solid var(--line);
}
footer p { color: var(--ink-soft); }
footer > a:last-child { color: var(--brand); font-weight: 750; text-decoration: none; }

@media (prefers-reduced-motion: no-preference) {
  .hero-copy { animation: intro-up .7s cubic-bezier(.16, 1, .3, 1) both; }
  .hero-visual { animation: intro-up .8s .12s cubic-bezier(.16, 1, .3, 1) both; }
  .proof-strip { animation: intro-up .7s .24s cubic-bezier(.16, 1, .3, 1) both; }
  @keyframes intro-up { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
}

@media (min-width: 981px) {
  .hero {
    min-height: calc(100dvh - 140px);
    padding: 16px 0 28px;
    align-items: start;
  }
  .hero-copy { padding-top: 16px; }
  .hero-visual { padding-top: 0; padding-bottom: 46px; }

  .interface-evidence {
    height: 100dvh;
    min-height: 620px;
    margin-top: 0;
    padding-top: clamp(24px, 3.5dvh, 42px);
    padding-bottom: clamp(24px, 3.5dvh, 42px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  .evidence-heading h2 { font-size: clamp(32px, 3.2vw, 48px); }
  .evidence-heading p { margin-top: 8px; }
  .evidence-tabs { margin-top: clamp(14px, 2dvh, 22px); }
  .evidence-panel { min-height: 0; margin-top: clamp(16px, 2.2dvh, 26px); flex: 1; }
  .evidence-layout { height: 100%; gap: clamp(36px, 4vw, 70px); }
  .evidence-copy h3 { font-size: clamp(26px, 2.5vw, 38px); }
  .evidence-copy p { margin-top: 12px; font-size: 14px; line-height: 1.6; }
  .terminal-capabilities { margin-top: 14px; }
  .terminal-entry { margin-top: 12px; }
  .phone-gallery { height: 100%; align-items: center; }
  .phone-gallery figure {
    height: 100%;
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  .phone-gallery img {
    width: auto;
    max-width: 100%;
    height: min(52dvh, 570px);
  }
  .phone-gallery .phone-offset { padding-top: 20px; }
  .phone-gallery figcaption { width: 100%; padding-top: 10px; }
  .web-gallery { align-self: center; }

  .delivery-section {
    min-height: 100dvh;
    padding-top: clamp(20px, 3dvh, 32px);
    padding-bottom: clamp(20px, 3dvh, 32px);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
  }
  .delivery-section .section-heading {
    max-width: 780px;
    margin-bottom: clamp(18px, 2.5dvh, 28px);
  }
  .delivery-section .section-heading > p:first-child { margin-bottom: 10px; }
  .delivery-section .section-heading h2 { font-size: clamp(32px, 3.6vw, 48px); }
  .delivery-section .delivery-row {
    gap: 20px;
    padding: clamp(13px, 1.8dvh, 17px) 20px;
  }
  .delivery-section .delivery-row span { line-height: 1.5; }
}

@media (max-width: 980px) {
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 30px; padding-top: 64px; }
  .hero-copy { max-width: 780px; }
  .hero h1 { max-width: 15em; }
  .hero-visual { max-width: 780px; }
  .delivery-section { padding-top: 88px; }
  .interface-evidence { margin-top: 48px; padding: 64px max(20px, calc((100% - var(--max)) / 2)); }
  .evidence-layout { grid-template-columns: 1fr; gap: 36px; }
  .terminal-capabilities { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .intro-brand strong { display: none; }
  main > section, footer { width: min(calc(100% - 32px), var(--max)); }
  .hero { padding: 46px 0 54px; }
  .hero h1 { font-size: clamp(38px, 11.6vw, 54px); }
  .hero-lead { font-size: 16px; }
  .hero-visual { padding: 10px 0 92px 34px; }
  .hero-phone { left: 0; bottom: 20px; width: 30%; min-width: 104px; border-width: 4px; border-radius: 24px; }
  .hero-visual figcaption { right: 0; bottom: 20px; max-width: 62%; }
  .proof-strip { grid-template-columns: 1fr 1fr; }
  .proof-strip article { padding: 20px; border-left: 0; }
  .proof-strip article:nth-child(even) { border-left: 1px solid var(--line); }
  .proof-strip article:nth-child(n+3) { border-top: 1px solid var(--line); }
  .interface-evidence { width: 100%; margin-top: 48px; padding: 56px 16px; }
  .evidence-tabs { width: 100%; }
  .evidence-panel { margin-top: 28px; }
  .evidence-layout { gap: 34px; }
  .phone-gallery { gap: 9px; }
  .phone-gallery img { border-width: 3px; border-radius: 18px; }
  .phone-gallery .phone-offset { padding-top: 28px; }
  .phone-gallery figcaption span { display: none; }
  .web-gallery { grid-template-columns: 1fr; }
  .web-gallery .web-main { grid-row: auto; }
  .delivery-table { overflow-x: auto; }
  .delivery-row { min-width: 720px; }
  .mini-entry { width: min(100%, 520px); }
  footer { grid-template-columns: auto 1fr; }
  footer p { font-size: 13px; }
  footer > a:last-child { grid-column: 1 / -1; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10231f;
    --surface: #17312b;
    --surface-strong: #1b3932;
    --surface-soft: #203e36;
    --ink: #edf5f1;
    --ink-soft: #b5c8c1;
    --line: #33534a;
    --brand: #63b8a1;
    --brand-strong: #0c3029;
    --brand-soft: #20483d;
    --accent: #e3bc5c;
    --accent-ink: #2f2308;
    --shadow: 0 24px 70px rgba(3, 15, 12, .38);
  }
  .challenge-field { background: linear-gradient(140deg, #0c3129, #175d4f); }
  .challenge-data { background: #3b3826; }
  .interface-evidence { background: #0c3029; }
  .delivery-head { background: #0b3028; }
}

@media (max-width: 900px) {
  .intro-page { margin-left: 0; padding-bottom: 70px; }
  .intro-sidebar {
    inset: auto 0 0;
    width: 100%;
    height: 64px;
    padding: 8px 12px;
    flex-direction: row;
  }
  .intro-side-brand,
  .intro-side-foot { display: none; }
  .intro-sidebar nav {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    overflow-y: hidden;
  }
  .intro-nav-item {
    min-width: max-content;
    min-height: 46px;
    padding-inline: 14px;
    flex: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@media print {
  body { color: #16352e; background: #fff; }
  main > section { break-inside: avoid; }
  .mobile-story { print-color-adjust: exact; -webkit-print-color-adjust: exact; }
}