/* 旅行打卡助手 · 官网
   现代极简：紧凑的垂直节奏、高对比细线、单一强调色。留白用于分组，不用于撑高页面。 */

:root {
  --bg: #FFFFFF;
  --ink: #111111;
  --ink-2: #55555A;
  --ink-3: #8A8A90;
  --ink-4: #AFAFB6;
  --line: #E4E4E7;
  --line-soft: #F1F1F3;
  --map-fill: #FAFAFB;
  --map-line: #DFDFE3;
  --accent: #E8622A;
  --accent-soft: #FDEDE5;
  --radius: 18px;
  --nav-h: 60px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B0B0C;
    --ink: #F4F4F5;
    --ink-2: #A6A6AD;
    --ink-3: #78787E;
    --ink-4: #4A4A50;
    --line: #232326;
    --line-soft: #17171A;
    --map-fill: #131315;
    --map-line: #2A2A2E;
    --accent: #FF7A45;
    --accent-soft: #2C1A12;
  }
  html { color-scheme: dark; }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.011em;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: 820px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 30;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; height: 100%; gap: 12px; }
.logo {
  display: flex; align-items: center; gap: 9px;
  font-size: 15px; font-weight: 600; letter-spacing: -0.02em;
}
.logo .mark {
  width: 22px; height: 22px; border-radius: 6px;
  background: var(--accent);
  display: grid; place-items: center;
  color: #fff; font-size: 11px; font-weight: 700;
}
.nav-links { margin-left: auto; display: flex; gap: 28px; font-size: 14px; color: var(--ink-2); }
.nav-links a { transition: color .15s; }
.nav-links a:hover { color: var(--ink); }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 0; text-align: center; }
.hero, .cta { text-wrap: balance; }
.eyebrow {
  display: inline-block;
  font-size: 12px; letter-spacing: .1em;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 24px;
}
h1 {
  margin: 0 auto;
  font-size: clamp(38px, 5.4vw, 68px);
  line-height: 1.06;
  font-weight: 650;
  letter-spacing: -0.042em;
  max-width: 16em;
}
h1 .dim { color: var(--ink-4); }
.lede {
  text-wrap: balance;
  margin: 22px auto 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-2);
}
.actions {
  margin-top: 32px;
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 46px; padding: 0 24px;
  border-radius: 9px; font-size: 15px; font-weight: 500;
  transition: opacity .15s, border-color .15s, transform .15s;
}
.btn-solid { background: var(--ink); color: var(--bg); }
.btn-solid:hover { opacity: .84; }
.btn-quiet { border: 1px solid var(--line); color: var(--ink); }
.btn-quiet:hover { border-color: var(--ink-3); }
.btn[aria-disabled="true"] { opacity: .35; cursor: default; }
.btn[aria-disabled="true"]:hover { opacity: .35; }
.hero-note { margin-top: 16px; font-size: 13px; color: var(--ink-3); }

/* ---------- 首屏插画 ---------- */
.figure-map {
  margin: 52px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.figure-map svg { width: 100%; height: auto; display: block; }

.map-grid line { stroke: var(--line-soft); stroke-width: 1; }
.map-block { fill: var(--map-fill); stroke: var(--map-line); stroke-width: 1.4; }
.map-road { fill: none; stroke: var(--map-line); stroke-width: 4; stroke-linecap: round; }
.map-route {
  fill: none; stroke: var(--accent); stroke-width: 2.8;
  stroke-linecap: round; stroke-dasharray: 6 8;
  animation: dash 30s linear infinite;
}
@keyframes dash { to { stroke-dashoffset: -280; } }
@media (prefers-reduced-motion: reduce) { .map-route { animation: none; } }
.map-stop { fill: var(--bg); stroke: var(--accent); stroke-width: 2.4; }
.map-stop-core { fill: var(--accent); }
.map-ring { fill: none; stroke: var(--accent); stroke-width: 1.2; opacity: .4; }
.map-label {
  fill: var(--ink-3);
  font-size: 11px;
  letter-spacing: .06em;
  font-family: inherit;
}

/* ---------- 通用段落 ---------- */
section { padding: 88px 0; }
.section-label {
  font-size: 12px; letter-spacing: .1em;
  color: var(--ink-3); margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}
.section-label::after {
  content: ''; flex: 1; height: 1px; background: var(--line);
}
h2 {
  text-wrap: balance;
  margin: 0 0 12px;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.2; font-weight: 650; letter-spacing: -0.032em;
}
.sub { margin: 0; font-size: 16px; color: var(--ink-2); max-width: 42em; }

/* ---------- 截图 ---------- */
.shots {
  margin-top: 44px;
  display: flex; gap: 26px;
  justify-content: center;
  overflow-x: auto;
  padding: 6px 2px 14px;
  scrollbar-width: thin;
}
.shot { margin: 0; flex: 0 0 auto; cursor: default; }
.shot img {
  width: 288px; height: 622px;
  object-fit: cover; object-position: top;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--line-soft);
  box-shadow: 0 1px 2px rgba(17, 17, 17, .04), 0 12px 32px rgba(17, 17, 17, .06);
  transition: transform .25s ease, box-shadow .25s ease;
}
.shot:hover img {
  transform: translateY(-4px);
  box-shadow: 0 2px 4px rgba(17, 17, 17, .05), 0 18px 44px rgba(17, 17, 17, .1);
}
.shot figcaption {
  margin-top: 14px; font-size: 13px; color: var(--ink-3);
  text-align: center; letter-spacing: .02em;
}

/* ---------- 功能（两列） ---------- */
.features {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 56px;
  border-top: 1px solid var(--line);
}
.feature {
  padding: 26px 0 28px;
  border-bottom: 1px solid var(--line);
}
.feature .num {
  font-size: 12px; color: var(--accent);
  letter-spacing: .08em; font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}
.feature h3 {
  margin: 0 0 7px; font-size: 18px; font-weight: 600; letter-spacing: -0.02em;
}
.feature p { margin: 0; font-size: 15px; color: var(--ink-2); }

/* ---------- 说明 ---------- */
.notes { margin-top: 40px; border-top: 1px solid var(--line); }
.note-row {
  display: grid; grid-template-columns: 190px 1fr;
  gap: 0 36px; padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.note-row dt { font-size: 14px; font-weight: 600; }
.note-row dd { margin: 0; font-size: 15px; color: var(--ink-2); max-width: 46ch; }

/* ---------- 收尾 ---------- */
.cta {
  text-align: center; padding: 96px 0;
  border-top: 1px solid var(--line);
  background: var(--line-soft);
}
.cta h2 { max-width: 16em; margin: 0 auto 28px; }

/* ---------- 页脚 ---------- */
footer { padding: 36px 0 52px; border-top: 1px solid var(--line); }
.foot-top {
  display: flex; flex-wrap: wrap; gap: 8px 26px; align-items: center;
  font-size: 13px; color: var(--ink-3);
}
.foot-links { margin-left: auto; display: flex; flex-wrap: wrap; gap: 8px 22px; }
.foot-links a { color: var(--ink-2); }
.foot-links a:hover { color: var(--ink); }
.foot-bottom {
  margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line-soft);
  display: flex; flex-wrap: wrap; gap: 8px 22px;
  font-size: 12.5px; color: var(--ink-3);
}
.foot-bottom a { color: var(--ink-3); }
.foot-bottom a:hover { color: var(--ink-2); }

/* ---------- 文档页 ---------- */
.doc { padding: 72px 0 32px; }
.doc h1 { font-size: clamp(30px, 3.8vw, 42px); text-align: left; max-width: none; }
.doc .lede { margin: 16px 0 0; text-align: left; max-width: 44em; }
.doc-body { margin-top: 48px; }
.doc-body h2 { font-size: 18px; margin: 0 0 16px; }
.doc-block { padding: 26px 0; border-top: 1px solid var(--line); }
.doc-block:last-child { border-bottom: 1px solid var(--line); }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 8px 24px; margin: 0; font-size: 15px; }
.kv dt { color: var(--ink-3); }
.kv dd { margin: 0; }
.kv a { color: var(--accent); }
.kv a:hover { text-decoration: underline; }

.center-page {
  min-height: 56vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
}
.center-page .code {
  font-size: 88px; font-weight: 650; letter-spacing: -0.05em;
  color: var(--line); line-height: 1; margin: 0 0 6px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .features { gap: 0 36px; }
  .note-row { grid-template-columns: 1fr; gap: 6px; }
}

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
  .hero { padding-top: 56px; }
  section { padding: 64px 0; }
  .nav-links { gap: 16px; font-size: 13px; }
  .nav-links a[href="#shots"] { display: none; }
  h1 { font-size: clamp(32px, 8.6vw, 42px); letter-spacing: -0.032em; }
  .lede { font-size: 15.5px; margin-top: 18px; }
  .figure-map { margin-top: 36px; }
  .features { grid-template-columns: 1fr; }
  .shots { justify-content: flex-start; gap: 16px; }
  .shot img { width: 210px; height: 454px; }
  .cta { padding: 64px 0; }
  .doc { padding: 48px 0 20px; }
  .kv { grid-template-columns: 1fr; gap: 2px 0; }
  .kv dd { margin-bottom: 10px; }
}