:root {
  --paper: #F9F6EE;
  --mustard: #C9A227;
  --ink: #1C3D2E;
  --sage: #4A7C59;
  --card: #FFFDF7;
  --line: #E4D7B0;
  --muted: #5A6F62;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(201, 162, 39, 0.12), transparent 36%),
    repeating-linear-gradient(0deg, transparent, transparent 27px, rgba(28, 61, 46, 0.03) 28px);
}

img, svg { max-width: 100%; display: block; }

a { color: var(--sage); }

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(249, 246, 238, 0.94);
  border-bottom: 2px solid var(--line);
  backdrop-filter: blur(8px);
}

.top-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--mustard);
  color: var(--ink);
  display: grid;
  place-items: center;
  font-size: 15px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  font-size: 14px;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.nav a:hover { border-bottom-color: var(--mustard); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--mustard);
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 999px;
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
}

.btn:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }

.btn-ghost {
  background: transparent;
  box-shadow: none;
}

.hero {
  padding: 56px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
}

.kicker {
  display: inline-block;
  background: #F3E6B8;
  color: var(--ink);
  border: 1px solid var(--mustard);
  padding: 4px 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

h1 {
  font-family: "Georgia", "Songti SC", "SimSun", serif;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.28;
  margin-bottom: 18px;
}

.hero p { margin-bottom: 14px; color: var(--muted); font-size: 17px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 10px; }

.hero-visual {
  background: var(--card);
  border: 2px solid var(--ink);
  border-radius: 20px;
  padding: 22px;
  box-shadow: 10px 10px 0 rgba(201, 162, 39, 0.35);
}

.hero-visual svg { width: 100%; height: auto; }

.story {
  padding: 20px 0 50px;
}

.story-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  position: relative;
  background: var(--card);
  border: 2px solid var(--ink);
  border-radius: 16px;
  overflow: hidden;
}

.story-board::before {
  content: "";
  position: absolute;
  left: 12%;
  right: 12%;
  top: 46px;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--mustard) 0 18px, transparent 18px 28px);
}

.story-item {
  padding: 28px 22px 24px;
  text-align: center;
}

.story-num {
  width: 36px;
  height: 36px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--ink);
  color: #F9F6EE;
  display: grid;
  place-items: center;
  position: relative;
  z-index: 1;
  font-weight: 700;
}

.story-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.story-item p { font-size: 14px; color: var(--muted); }

section { padding: 56px 0; }

h2 {
  font-family: "Georgia", "Songti SC", "SimSun", serif;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.35;
  margin-bottom: 16px;
}

.lead { margin-bottom: 22px; color: var(--muted); max-width: 760px; }

.steps {
  background: #F3EBCE;
  border-block: 2px solid var(--line);
}

.flow {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  position: relative;
  margin-top: 28px;
}

.flow::before {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  top: 38px;
  height: 6px;
  background: var(--ink);
  border-radius: 99px;
}

.flow li {
  background: var(--card);
  border: 2px solid var(--ink);
  border-radius: 16px;
  padding: 18px 16px 20px;
  position: relative;
}

.node {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--mustard);
  border: 4px solid var(--ink);
  display: grid;
  place-items: center;
  font-size: 22px;
  font-weight: 800;
  margin: 0 auto 16px;
  position: relative;
  z-index: 1;
}

.flow h3 { text-align: center; font-size: 17px; margin-bottom: 8px; }
.flow p { font-size: 14px; color: var(--muted); }

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card svg { width: 28px; height: 28px; margin-bottom: 8px; color: #1c3d2e; display: block; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 6px solid var(--mustard);
  border-radius: 12px;
  padding: 20px 18px;
}

.card h3 { margin-bottom: 8px; font-size: 18px; }
.card p { color: var(--muted); font-size: 15px; }

.chat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.pane {
  background: var(--card);
  border: 2px dashed var(--sage);
  border-radius: 14px;
  padding: 22px;
}

.pane h3 { color: var(--sage); margin-bottom: 10px; }

.limits {
  margin-top: 18px;
  background: #E8F0EA;
  border-left: 6px solid var(--sage);
  padding: 16px 18px;
}

.sec-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}

.lock {
  background: var(--ink);
  color: #F3EBCE;
  border-radius: 16px;
  padding: 26px;
}

.lock h3 { color: var(--mustard); margin-bottom: 10px; }
.lock p { color: #D7E3DA; }

.browsers {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.browsers span {
  border: 1px solid var(--ink);
  padding: 6px 12px;
  border-radius: 999px;
  background: #FFF;
  font-size: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 2px solid var(--ink);
}

th, td {
  border: 1px solid var(--line);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  font-size: 15px;
}

th { background: var(--ink); color: #F9F6EE; }

tr:nth-child(even) td { background: #FAF4E2; }

details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 10px;
}

summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

summary::-webkit-details-marker { display: none; }

summary::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--mustard);
  margin-right: 10px;
  border: 1px solid var(--ink);
}

details p { margin-top: 8px; color: var(--muted); }

.foot {
  background: var(--ink);
  color: #D7E3DA;
  padding: 36px 0 28px;
  font-size: 14px;
}

.foot p { margin-bottom: 8px; }
.foot strong { color: var(--mustard); }

@media (max-width: 900px) {
  .hero-grid,
  .chat-grid,
  .sec-split,
  .cards,
  .story-board,
  .flow { grid-template-columns: 1fr; }
  .flow::before,
  .story-board::before { display: none; }
  .nav { display: none; }
}

.news-guide { padding: 40px 0; background: #fffdf4; }
.news-flow-g { list-style: none; display: grid; gap: 14px; }
.news-flow-g li { display: grid; grid-template-columns: 7px 1fr; gap: 16px; background: #f9f6ee; padding: 16px 18px; }
.news-flow-g li::before { content: ""; width: 7px; background: #c9a227; }
.news-flow-g time { color: #4a7c59; font-size: 12px; }
.news-flow-g h3 { margin: 4px 0 8px; }