/* ==========================================================================
   奇寻 iqixun.cn · 档案美学 Editorial
   设计令牌：暖纸 × 深蓝墨 × 暖金 × 朱砂（唯一彩色强调）
   ========================================================================== */

:root {
  --ink: #1C2B4A;          /* 深蓝墨 */
  --ink-soft: #33456B;
  --paper: #F7F4EE;        /* 暖纸 */
  --paper-2: #EFE9DC;
  --paper-3: #E6DECB;
  --gold: #B08D57;         /* 暖金（唯一强调） */
  --gold-soft: #C9A876;
  --seal: #9E3B33;         /* 朱砂，全站只用于印章 */
  --text: #2C2C33;
  --text-2: #73737E;
  --line: #D8D0BE;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "FangSong", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --w-page: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-weight: 300;
  color: var(--text);
  background: var(--paper);
  line-height: 1.9;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* 纸纹颗粒：全站覆一层极淡噪点 */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}

::selection { background: var(--gold-soft); color: #fff; }

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

.wrap { max-width: var(--w-page); margin: 0 auto; padding: 0 28px; }

/* --------------------------------------------------------------------------
   页眉
   -------------------------------------------------------------------------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 244, 238, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand {
  font-family: var(--serif); font-weight: 900;
  font-size: 26px; letter-spacing: .35em; color: var(--ink);
}
.brand small {
  font-family: var(--sans); font-weight: 300; font-size: 11px;
  letter-spacing: .28em; color: var(--text-2); margin-left: 10px; vertical-align: 3px;
}
.site-nav { display: flex; gap: 38px; font-size: 14px; letter-spacing: .22em; }
.site-nav a { color: var(--text-2); transition: color .25s; position: relative; padding: 4px 0; }
.site-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: var(--gold); transition: width .3s;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { width: 100%; }
.site-nav a.on { color: var(--ink); }
.site-nav a.on::after { width: 100%; }

/* --------------------------------------------------------------------------
   首屏
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: 110px 0 96px;
  overflow: hidden;
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(176,141,87,.12), transparent 60%),
    var(--paper);
}
.hero .wrap { position: relative; }

/* 巨幅底纹字 */
.hero-ghost {
  position: absolute; right: -1%; top: 34px;
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(140px, 22vw, 300px); line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(28, 43, 74, .08);
  user-select: none; pointer-events: none;
}
.hero-kicker {
  display: inline-flex; align-items: center; gap: 14px;
  font-size: 12px; letter-spacing: .5em; color: var(--gold);
  margin-bottom: 34px;
}
.hero-kicker::before { content: ""; width: 44px; height: 1px; background: var(--gold); }
.hero h1 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(34px, 5.4vw, 60px);
  line-height: 1.42; color: var(--ink);
  letter-spacing: .06em;
  max-width: 19em;
}
.hero h1 em { font-style: normal; color: var(--gold); }
.hero-sub {
  margin-top: 30px; max-width: 34em;
  font-size: 16px; color: var(--text-2);
}
.hero-cta { margin-top: 46px; display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 34px;
  font-size: 14px; letter-spacing: .3em; text-indent: .3em;
  border: 1px solid var(--ink);
  color: var(--ink); background: transparent;
  transition: all .3s;
  cursor: pointer;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.gold { border-color: var(--gold); background: var(--gold); color: #fff; }
.btn.gold:hover { background: var(--ink); border-color: var(--ink); }

/* 首屏双栏：文字 × 档案照片 */
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.hero-photo {
  position: relative;
  background: #fff;
  padding: 14px;
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(28, 43, 74, .16);
  transform: rotate(1.4deg);
  margin: 10px 0 40px;
}
.hero-photo > img {
  width: 100%; aspect-ratio: 4 / 3.1;
  object-fit: cover; object-position: 22% center;
  display: block;
}
.hero-photo figcaption {
  margin-top: 14px;
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
}
.hero-photo .fig-cap {
  font-family: var(--serif);
  font-size: 13px; letter-spacing: .3em; color: var(--text-2);
}
.fig-qr { display: flex; align-items: center; gap: 10px; flex: none; }
.fig-qr img { width: 54px; height: 54px; }
.fig-qr-text {
  font-size: 11px; line-height: 1.6;
  color: var(--text-2); letter-spacing: .08em; text-align: left;
}

/* 首屏右缘竖排 */
.v-strip {
  position: absolute; right: 34px; top: 110px;
  writing-mode: vertical-rl;
  font-family: var(--serif);
  font-size: 15px; letter-spacing: .9em;
  color: rgba(28, 43, 74, .34);
  border-right: 1px solid var(--line);
  padding-right: 14px; height: 320px;
  user-select: none;
}
/* --------------------------------------------------------------------------
   区块通用
   -------------------------------------------------------------------------- */
.sec { padding: 120px 0; position: relative; }
.sec.tint { background: var(--paper-2); }
.sec.deep { background: var(--ink); color: #EDE7D8; }
.sec.deep .sec-head h2, .sec.deep .num-cn { color: #F2ECDD; }
.sec.deep p { color: #C9C4B4; }

.sec-head { position: relative; margin-bottom: 72px; }
.num-cn {
  position: absolute; left: -12px; top: -54px;
  font-family: var(--serif); font-weight: 900;
  font-size: 150px; line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(176, 141, 87, .35);
  user-select: none; pointer-events: none;
}
.sec-head .k {
  display: block; font-size: 12px; letter-spacing: .5em;
  color: var(--gold); margin-bottom: 16px;
}
.sec-head h2 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(26px, 3.6vw, 40px);
  color: var(--ink); letter-spacing: .08em;
}
.sec-head .lead { margin-top: 18px; color: var(--text-2); max-width: 36em; }

/* 滚动浮现 */
.fx { opacity: 0; transform: translateY(28px); transition: opacity .9s ease, transform .9s ease; }
.fx.in { opacity: 1; transform: none; }
.fx.d1 { transition-delay: .12s; } .fx.d2 { transition-delay: .24s; }
.fx.d3 { transition-delay: .36s; } .fx.d4 { transition-delay: .48s; }

/* --------------------------------------------------------------------------
   品类一句话（第贰屏）
   -------------------------------------------------------------------------- */
.pitch {
  display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center;
}
.pitch .big {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 2; color: var(--ink); letter-spacing: .04em;
}
.pitch .big strong { color: var(--gold); font-weight: 900; }
.pitch .side p { color: var(--text-2); font-size: 15px; }
.pitch .side p + p { margin-top: 16px; }
.pitch .side .motto {
  margin-top: 30px; padding: 18px 22px;
  border-left: 2px solid var(--gold);
  font-family: var(--serif); color: var(--ink);
  font-size: 15px; letter-spacing: .12em;
  background: rgba(176, 141, 87, .07);
}

/* --------------------------------------------------------------------------
   玩法三步（第叁屏）
   -------------------------------------------------------------------------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 34px; counter-reset: step; }
.step {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  padding: 44px 30px 36px;
  transition: transform .35s, box-shadow .35s;
}
.step:hover { transform: translateY(-6px); box-shadow: 0 22px 44px rgba(28,43,74,.10); }
.step .no {
  font-family: var(--serif); font-weight: 900;
  font-size: 15px; color: var(--gold);
  letter-spacing: .3em;
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 22px;
}
.step .no::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.step h3 { font-family: var(--serif); font-size: 21px; color: var(--ink); letter-spacing: .1em; margin-bottom: 14px; }
.step p { font-size: 14.5px; color: var(--text-2); }
.step .tag {
  margin-top: 22px; display: inline-block;
  font-size: 11px; letter-spacing: .2em;
  color: var(--gold); border: 1px dashed var(--gold-soft);
  padding: 4px 12px;
}

/* --------------------------------------------------------------------------
   线路卡（第肆屏）
   -------------------------------------------------------------------------- */
.route-band { display: grid; grid-template-columns: 1.15fr .85fr; gap: 0; border: 1px solid var(--line); background: #fff; }
.route-visual {
  position: relative; min-height: 420px;
  background-size: cover; background-position: center;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.route-visual::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(165deg, rgba(28,43,74,.66), rgba(28,43,74,.82));
  z-index: 1;
}
.route-visual > * { position: relative; z-index: 2; }
.rv-img, .ph-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.route-visual .cn-title {
  writing-mode: vertical-rl;
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(44px, 5vw, 66px);
  letter-spacing: .3em; color: #F2ECDD;
  text-shadow: 0 4px 30px rgba(0,0,0,.35);
}
.route-visual .era {
  position: absolute; top: 26px; left: 30px;
  font-family: var(--serif); letter-spacing: .5em;
  font-size: 13px; color: var(--gold-soft);
}
.route-visual .seal-stamp {
  position: absolute; right: 26px; bottom: 26px;
  width: 74px; height: 74px;
  border: 2px solid var(--seal);
  color: var(--seal);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-weight: 900; font-size: 24px;
  letter-spacing: 4px; text-indent: 4px;
  transform: rotate(-7deg);
  background: rgba(158,59,51,.06);
  box-shadow: inset 0 0 0 2px rgba(158,59,51,.25);
}
.route-info { padding: 52px 48px; display: flex; flex-direction: column; }
.route-info h3 { font-family: var(--serif); font-weight: 900; font-size: 28px; color: var(--ink); letter-spacing: .1em; }
.route-info .hook {
  margin-top: 20px;
  font-family: var(--serif); font-size: 16.5px; line-height: 2.1;
  color: var(--ink-soft);
}
.route-meta { margin: 30px 0; border-top: 1px solid var(--line); }
.route-meta div {
  display: flex; justify-content: space-between;
  padding: 13px 2px; border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.route-meta dt { color: var(--text-2); letter-spacing: .3em; }
.route-meta dd { color: var(--ink); letter-spacing: .06em; }
.route-info .go { margin-top: auto; align-self: flex-start; }

/* --------------------------------------------------------------------------
   三类人群（第伍屏）
   -------------------------------------------------------------------------- */
.crowds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 34px; }
.crowd { border-top: 2px solid var(--gold); padding-top: 26px; }
.crowd .who {
  font-family: var(--serif); font-weight: 900;
  font-size: 20px; color: var(--ink); letter-spacing: .14em;
  margin-bottom: 12px;
}
.crowd p { font-size: 14.5px; color: var(--text-2); }

/* --------------------------------------------------------------------------
   品牌理念（第陆屏，深蓝反转）
   -------------------------------------------------------------------------- */
.philo { text-align: center; max-width: 760px; margin: 0 auto; }
.philo .verse {
  font-family: var(--serif);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 2.2; letter-spacing: .14em;
  color: #F2ECDD;
}
.philo .verse em { font-style: normal; color: var(--gold-soft); }
.philo .explain { margin-top: 34px; font-size: 15px; color: #B9B3A2; }
.philo .seal-stamp-lg {
  margin: 46px auto 0;
  width: 92px; height: 92px;
  border: 2px solid var(--seal);
  color: var(--seal);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-weight: 900; font-size: 30px;
  letter-spacing: 6px; text-indent: 6px;
  transform: rotate(-6deg);
  background: rgba(158,59,51,.08);
  box-shadow: inset 0 0 0 3px rgba(158,59,51,.3);
}

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */
footer { background: #16223B; color: #A9A490; padding: 74px 0 40px; font-size: 13px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 50px; }
.foot-grid h4 {
  font-family: var(--serif); color: #E8E2D0;
  font-size: 16px; letter-spacing: .3em; margin-bottom: 18px;
}
.foot-grid .brand-line {
  font-family: var(--serif); font-size: 24px; font-weight: 900;
  color: #F2ECDD; letter-spacing: .35em; margin-bottom: 14px;
}
.foot-grid p { line-height: 2.1; }
.foot-grid a:hover { color: var(--gold-soft); }
.foot-qr { width: 116px; background: #fff; padding: 8px; }
.foot-bottom {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid rgba(247,244,238,.12);
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  font-size: 12px; letter-spacing: .08em; color: #7B7666;
}
.foot-bottom a { color: inherit; }
.foot-bottom a:hover { color: var(--gold-soft); }

/* --------------------------------------------------------------------------
   内页（路线 / 关于）
   -------------------------------------------------------------------------- */
.page-hero {
  background:
    radial-gradient(900px 400px at 20% -20%, rgba(176,141,87,.16), transparent 60%),
    var(--ink);
  color: #F2ECDD;
  padding: 96px 0 84px;
  position: relative; overflow: hidden;
}
.page-hero .k { font-size: 12px; letter-spacing: .5em; color: var(--gold-soft); display: block; margin-bottom: 20px; }
.page-hero h1 { font-family: var(--serif); font-weight: 900; font-size: clamp(30px, 4.6vw, 52px); letter-spacing: .1em; line-height: 1.4; }
.page-hero .sub { margin-top: 20px; color: #B9B3A2; max-width: 40em; }
.page-hero .ghost {
  position: absolute; right: -8px; bottom: -30px;
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(120px, 18vw, 240px); line-height: 1;
  color: transparent; -webkit-text-stroke: 1px rgba(242,236,221,.08);
  pointer-events: none; user-select: none;
  z-index: 2;
}
.page-hero .wrap { position: relative; z-index: 2; }
.page-hero.photo::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(28,43,74,.72), rgba(28,43,74,.88));
}

.article { max-width: 800px; margin: 0 auto; padding: 90px 28px 110px; }
.article h2 {
  font-family: var(--serif); font-weight: 900;
  font-size: 24px; color: var(--ink); letter-spacing: .1em;
  margin: 64px 0 24px;
  display: flex; align-items: center; gap: 14px;
}
.article h2::before { content: ""; width: 26px; height: 2px; background: var(--gold); flex: none; }
.article p { color: #4A4A52; font-size: 15.5px; margin-bottom: 18px; }
.article .entity {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 26px 30px;
  font-size: 15px; line-height: 2.1; color: var(--ink);
  margin-bottom: 10px;
}
.fact-table { width: 100%; border-collapse: collapse; margin: 8px 0 10px; }
.fact-table th, .fact-table td {
  text-align: left; padding: 12px 6px;
  border-bottom: 1px solid var(--line); font-size: 14px;
}
.fact-table th { color: var(--text-2); font-weight: 400; letter-spacing: .3em; width: 8em; }
.fact-table td { color: var(--ink); }

.faq { border: 1px solid var(--line); background: #fff; }
.faq details { border-bottom: 1px solid var(--line); }
.faq details:last-child { border-bottom: none; }
.faq summary {
  cursor: pointer; list-style: none;
  padding: 22px 26px;
  font-family: var(--serif); font-size: 16.5px; color: var(--ink);
  letter-spacing: .06em;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "＋"; color: var(--gold); font-family: var(--sans); transition: transform .3s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .a { padding: 0 26px 26px; color: var(--text-2); font-size: 14.5px; line-height: 2.05; }

/* --------------------------------------------------------------------------
   响应式
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .pitch, .route-band { grid-template-columns: 1fr; }
  .steps, .crowds { grid-template-columns: 1fr; gap: 22px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-ghost { display: none; }
  .hero-photo { transform: none; margin-bottom: 8px; }
  .hero-cta { display: grid; grid-template-columns: 1fr; gap: 12px; }
  .hero-cta .btn { justify-content: center; width: 100%; text-indent: 0; letter-spacing: .2em; }
  .v-strip { display: none; }
  .num-cn { font-size: 96px; top: -34px; }
  .sec { padding: 84px 0; }
  .site-nav { gap: 20px; font-size: 12.5px; }
  .foot-grid { grid-template-columns: 1fr; gap: 34px; }
  .route-visual { min-height: 300px; }
  .route-visual .cn-title { font-size: 30px; letter-spacing: .24em; }
  .page-hero .ghost { display: none; }
}
@media (max-width: 560px) {
  .site-head .wrap { height: 58px; }
  .brand { font-size: 21px; letter-spacing: .22em; }
  .brand small { display: none; }
  .site-nav { gap: 12px; font-size: 11.5px; letter-spacing: .06em; }
  .hero { padding: 70px 0 70px; }
  .hero-photo figcaption { flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero-photo .fig-cap { font-size: 12px; letter-spacing: .18em; }
  .route-info { padding: 36px 26px; }
  .article { padding: 64px 22px 80px; }
}