/* 知序官网 · 新中式纸面设计系统
   与运营台同源：暖白纸面 / 墨绿 / 朱砂 / 金，Serif 标题。
   无外部字体请求，中国大陆可直连。 */

:root {
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;

  --ink-950: #102b28;
  --jade-800: #174a43;
  --jade-600: #2e6b5d;
  --jade-100: #e7f0eb;
  --vermilion-700: #ae4b35;
  --vermilion-100: #f8e9e3;
  --gold-600: #9a6b28;
  --paper-50: #fbfaf6;
  --surface: #ffffff;
  --line: #e6e2d9;
  --ink-soft: #50615d;
  --muted: #6d7774;

  --container: 1120px;
  --gutter: clamp(20px, 5vw, 48px);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper-50);
  color: var(--ink-950);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 纸面颗粒：极淡的 SVG 噪点，给纸感而非网格感 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  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' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncA type='linear' slope='0.05'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--jade-100); color: var(--ink-950); }

a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid rgba(46, 107, 93, 0.34); outline-offset: 3px; }

.container { position: relative; z-index: 1; max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- 顶栏 ---------- */

.topbar { border-bottom: 1px solid var(--line); background: rgba(251, 250, 246, 0.92); backdrop-filter: blur(6px); position: sticky; top: 0; z-index: 10; }
.topbar__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.brandmark { display: inline-flex; align-items: center; gap: 10px; }
.brandmark__seal { width: 30px; height: 30px; display: block; }
.brandmark__name { font-family: var(--font-display); font-size: 20px; letter-spacing: 0.22em; }
.brandmark__sub { color: var(--muted); font-size: 10px; letter-spacing: 0.3em; margin-top: 2px; }
.topbar__nav { display: flex; gap: clamp(14px, 3vw, 32px); font-size: 13px; letter-spacing: 0.12em; color: var(--ink-soft); }
.topbar__nav a { padding: 6px 2px; border-bottom: 2px solid transparent; transition: color 160ms ease, border-color 160ms ease; }
.topbar__nav a:hover { color: var(--vermilion-700); border-color: var(--vermilion-700); }

/* ---------- 首屏 ---------- */

.hero { position: relative; overflow: hidden; }
.hero__inner { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: clamp(24px, 6vw, 80px); align-items: stretch; padding-top: clamp(64px, 12vh, 128px); padding-bottom: clamp(56px, 10vh, 112px); }

/* 巨大的"序"字水印 */
.hero__ghost {
  position: absolute; right: -4%; top: -12%;
  font-family: var(--font-display); font-size: clamp(280px, 42vw, 560px); line-height: 1;
  color: transparent; -webkit-text-stroke: 1px rgba(16, 43, 40, 0.07);
  pointer-events: none; user-select: none;
}

.hero__kicker { color: var(--vermilion-700); font-size: 13px; font-weight: 700; letter-spacing: 0.42em; }
.hero__title { margin-top: 22px; font-family: var(--font-display); font-size: clamp(56px, 9vw, 108px); line-height: 1.08; letter-spacing: 0.1em; font-weight: 600; }
.hero__title small { display: block; margin-top: 14px; font-size: clamp(17px, 2vw, 22px); letter-spacing: 0.34em; color: var(--jade-600); font-weight: 600; }
.hero__lede { margin-top: 28px; max-width: 34em; color: var(--ink-soft); font-size: clamp(15px, 1.6vw, 17px); }
.hero__lede em { font-style: normal; color: var(--vermilion-700); }

.hero__cta { margin-top: 44px; display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.qr { display: flex; align-items: center; gap: 14px; }
/* 小程序码占位框：部署前把真实小程序码放到 assets/qr.png 即可 */
.qr__frame {
  width: 96px; height: 96px; flex: 0 0 auto;
  border: 1px solid var(--line); background: var(--surface);
  background-image: linear-gradient(45deg, rgba(174, 75, 53, 0.06) 25%, transparent 25%, transparent 75%, rgba(174, 75, 53, 0.06) 75%), linear-gradient(45deg, rgba(174, 75, 53, 0.06) 25%, transparent 25%, transparent 75%, rgba(174, 75, 53, 0.06) 75%);
  background-size: 16px 16px; background-position: 0 0, 8px 8px;
  display: grid; place-items: center; color: var(--muted); font-size: 11px; letter-spacing: 0.1em; text-align: center; padding: 8px;
}
.qr__frame img { width: 100%; height: 100%; object-fit: contain; }
.qr__hint { font-size: 13px; color: var(--ink-soft); line-height: 1.9; }
.qr__hint strong { display: block; color: var(--ink-950); font-size: 15px; letter-spacing: 0.06em; }

/* 竖排栏：右缘的呼吸 */
.hero__rail {
  display: flex; align-items: flex-start; gap: 18px;
  writing-mode: vertical-rl;
  font-family: var(--font-display); font-size: clamp(15px, 1.6vw, 19px);
  letter-spacing: 0.42em; color: var(--jade-800);
  border-inline-start: 1px solid var(--line);
  padding-inline-start: clamp(16px, 2.5vw, 28px);
  min-height: clamp(280px, 44vh, 420px);
}
.hero__rail .rail-note { color: var(--muted); font-size: 13px; letter-spacing: 0.36em; }
.seal {
  width: 52px; height: 52px; align-self: flex-start;
  background: var(--vermilion-700); color: #fdf6ef;
  font-family: var(--font-display); font-size: 19px; line-height: 1.15;
  display: grid; place-items: center; letter-spacing: 0.08em;
  writing-mode: horizontal-tb; border-radius: 6px;
  box-shadow: 0 2px 10px rgba(174, 75, 53, 0.28);
}

/* ---------- 通用区块 ---------- */

.section { padding: clamp(56px, 10vh, 104px) 0; }
.section + .section { border-top: 1px solid var(--line); }
.section__head { display: flex; align-items: baseline; gap: 18px; margin-bottom: clamp(28px, 5vh, 48px); }
.section__no { color: var(--vermilion-700); font-family: var(--font-display); font-size: 15px; letter-spacing: 0.2em; }
.section__title { font-family: var(--font-display); font-size: clamp(26px, 3.4vw, 36px); letter-spacing: 0.14em; font-weight: 600; }
.section__en { margin-left: auto; color: var(--muted); font-size: 11px; letter-spacing: 0.32em; }

/* 五序索引：编辑部目录式 */
.wu-list { display: grid; }
.wu-item {
  display: grid; grid-template-columns: 72px minmax(0, 1fr) auto; gap: clamp(14px, 3vw, 32px);
  align-items: baseline; padding: clamp(20px, 3.4vh, 30px) 6px;
  border-top: 1px solid var(--line);
  transition: background 180ms ease, padding-left 180ms ease;
}
.wu-item:last-child { border-bottom: 1px solid var(--line); }
.wu-item:hover { background: var(--surface); padding-left: 16px; }
.wu-item__no { font-family: var(--font-display); font-size: 22px; color: var(--gold-600); letter-spacing: 0.1em; }
.wu-item:hover .wu-item__no { color: var(--vermilion-700); }
.wu-item__name { font-family: var(--font-display); font-size: clamp(20px, 2.6vw, 27px); letter-spacing: 0.18em; font-weight: 600; }
.wu-item__name span { margin-left: 14px; font-family: var(--font-sans); font-size: 12px; letter-spacing: 0.22em; color: var(--muted); font-weight: 400; }
.wu-item__desc { max-width: 42em; color: var(--ink-soft); font-size: 14.5px; margin-top: 6px; }

/* 商城橱窗 */
.mall-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(14px, 2.4vw, 26px); }
.mall-card { background: var(--surface); border: 1px solid var(--line); overflow: hidden; transition: transform 200ms ease, box-shadow 200ms ease; }
.mall-card:hover { transform: translateY(-4px); box-shadow: 0 14px 34px rgba(16, 43, 40, 0.1); }
.mall-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; display: block; }
.mall-card__body { padding: 14px 16px 16px; }
.mall-card__tag { color: var(--vermilion-700); font-size: 11px; letter-spacing: 0.26em; }
.mall-card__name { margin-top: 6px; font-family: var(--font-display); font-size: 17px; letter-spacing: 0.08em; }
.mall-note { margin-top: 18px; color: var(--muted); font-size: 13px; letter-spacing: 0.04em; }

/* 引言 */
.quote { position: relative; padding: clamp(48px, 9vh, 88px) 0; }
.quote__mark { font-family: var(--font-display); font-size: 88px; line-height: 0.6; color: var(--vermilion-700); opacity: 0.85; }
.quote__text { margin-top: 18px; font-family: var(--font-display); font-size: clamp(22px, 3.4vw, 34px); line-height: 1.7; letter-spacing: 0.06em; max-width: 26em; }
.quote__text em { font-style: normal; color: var(--vermilion-700); }
.quote__from { margin-top: 18px; color: var(--muted); font-size: 13px; letter-spacing: 0.24em; }

/* 品牌印章大图带 */
.sealband { display: flex; align-items: center; gap: clamp(18px, 3vw, 32px); }
.sealband img { width: clamp(64px, 8vw, 92px); height: auto; display: block; }
.sealband p { color: var(--ink-soft); font-size: 14.5px; max-width: 40em; }

/* ---------- 页脚 ---------- */

.footer { border-top: 1px solid var(--line); background: var(--ink-950); color: #c8d4cd; margin-top: 40px; }
.footer__inner { padding-top: clamp(40px, 7vh, 64px); padding-bottom: 28px; display: grid; gap: 26px; }
.footer__brand { display: flex; align-items: center; gap: 12px; color: #f2f5f0; }
.footer__brand .brandmark__name { font-size: 18px; }
.footer__cols { display: flex; flex-wrap: wrap; gap: clamp(24px, 6vw, 72px); font-size: 13px; }
.footer__col strong { display: block; color: #8fa69c; font-size: 11px; letter-spacing: 0.3em; margin-bottom: 10px; font-weight: 600; }
.footer__col a { display: block; padding: 3px 0; color: #c8d4cd; transition: color 150ms ease; }
.footer__col a:hover { color: #fff; }
.footer__legal { border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: 18px; display: flex; flex-wrap: wrap; gap: 8px 22px; align-items: center; font-size: 12px; color: #7d918a; }
.footer__legal a { color: #a9bab2; }
.footer__legal a:hover { color: #fff; }

/* ---------- 法律文档页 ---------- */

.doc-hero { padding-top: clamp(48px, 9vh, 84px); padding-bottom: clamp(24px, 4vh, 40px); border-bottom: 1px solid var(--line); }
.doc-hero__eyebrow { color: var(--vermilion-700); font-size: 12px; font-weight: 700; letter-spacing: 0.4em; }
.doc-hero__title { margin-top: 16px; font-family: var(--font-display); font-size: clamp(30px, 4.6vw, 46px); letter-spacing: 0.16em; font-weight: 600; }
.doc-hero__sub { margin-top: 14px; color: var(--ink-soft); max-width: 40em; }
.doc-body { padding-top: clamp(32px, 6vh, 56px); padding-bottom: clamp(56px, 9vh, 88px); max-width: 760px; }
.doc-section { padding: 26px 0; border-top: 1px solid var(--line); }
.doc-section:first-child { border-top: 0; padding-top: 0; }
.doc-section h2 { font-family: var(--font-display); font-size: 19px; letter-spacing: 0.14em; color: var(--jade-800); font-weight: 600; }
.doc-section p { margin-top: 12px; color: var(--ink-soft); font-size: 15px; }
.doc-back { display: inline-flex; align-items: center; gap: 8px; color: var(--jade-600); font-size: 13px; letter-spacing: 0.14em; padding: 4px 0; }
.doc-back:hover { color: var(--vermilion-700); }

/* ---------- 入场动画：一次性的错峰浮现 ---------- */

@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
.rise { opacity: 0; animation: rise 700ms cubic-bezier(0.22, 0.8, 0.3, 1) forwards; }
.rise[data-d="1"] { animation-delay: 80ms; }
.rise[data-d="2"] { animation-delay: 160ms; }
.rise[data-d="3"] { animation-delay: 240ms; }
.rise[data-d="4"] { animation-delay: 320ms; }
.rise[data-d="5"] { animation-delay: 400ms; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rise { animation: none; opacity: 1; }
  .wu-item, .mall-card { transition: none; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 860px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__rail { display: none; }
  .hero__ghost { font-size: 300px; right: -18%; }
  .mall-grid { grid-template-columns: 1fr; }
  .wu-item { grid-template-columns: 48px 1fr; }
  .wu-item__desc { grid-column: 2; }
  .section__en { display: none; }
  .topbar__nav { gap: 14px; font-size: 12px; }
}

/* ---------- 商家入驻页 ---------- */

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(16px, 2.6vw, 26px); }
.form-item { display: grid; gap: 8px; }
.form-item--wide { grid-column: 1 / -1; }
.form-label { color: var(--ink-soft); font-size: 13px; letter-spacing: 0.08em; }
.form-label i { font-style: normal; color: var(--vermilion-700); font-size: 11px; margin-left: 6px; letter-spacing: 0.1em; }
.form-item input[type="text"], .form-item input[type="tel"], .form-item select, .form-item textarea {
  min-height: 42px; border: 1px solid var(--line); border-radius: 4px; padding: 10px 12px;
  background: var(--surface); color: var(--ink-950); font: inherit; width: 100%;
}
.form-item textarea { resize: vertical; }
.form-item input:focus, .form-item select:focus, .form-item textarea:focus { outline: 2px solid rgba(46, 107, 93, 0.4); outline-offset: 1px; }
.form-hint { color: var(--muted); font-size: 12.5px; }
.form-item input[type="file"] { font-size: 13px; color: var(--ink-soft); }
.form-check { display: flex; gap: 10px; align-items: flex-start; font-size: 13.5px; color: var(--ink-soft); }
.form-check input { margin-top: 4px; width: 16px; height: 16px; accent-color: var(--jade-800); }
.form-check a { color: var(--jade-600); border-bottom: 1px solid var(--jade-600); }
.form-check a:hover { color: var(--vermilion-700); border-color: var(--vermilion-700); }
.hp-field { position: absolute; left: -9999px; top: -9999px; height: 0; overflow: hidden; }
.form-status { min-height: 22px; margin: 14px 0 0; color: var(--vermilion-700); font-size: 14px; }
.submit-button {
  min-height: 46px; margin-top: 18px; width: min(320px, 100%);
  border: 1px solid var(--jade-800); border-radius: 4px; background: var(--jade-800);
  color: #fff; font-size: 15px; font-weight: 700; letter-spacing: 0.2em; cursor: pointer;
  transition: background 160ms ease;
}
.submit-button:hover { background: #123d37; }
.submit-button:disabled { opacity: 0.6; cursor: wait; }
.submit-button--ghost { display: inline-grid; place-items: center; background: transparent; color: var(--jade-800); }
.submit-button--ghost:hover { background: var(--jade-100); }

.join-success { padding: clamp(32px, 6vh, 56px); border: 1px solid var(--line); background: var(--surface); text-align: center; }
.join-success__seal {
  width: 64px; height: 64px; margin: 0 auto 18px; display: grid; place-items: center;
  background: var(--vermilion-700); color: #fdf6ef; font-family: var(--font-display);
  font-size: 26px; border-radius: 6px; box-shadow: 0 2px 10px rgba(174, 75, 53, 0.28);
}
.join-success__title { font-family: var(--font-display); font-size: clamp(24px, 3vw, 32px); letter-spacing: 0.18em; }
.join-success__no { margin-top: 14px; color: var(--ink-soft); font-size: 14.5px; }
.join-success__no strong { display: inline-block; margin-left: 8px; padding: 2px 10px; border: 1px dashed var(--vermilion-700); color: var(--vermilion-700); font-size: 16px; letter-spacing: 0.06em; }
.join-success__text { margin: 16px auto 24px; max-width: 30em; color: var(--ink-soft); font-size: 14.5px; line-height: 2; }

.faq-list { display: grid; gap: 10px; max-width: 820px; }
.faq-item { border: 1px solid var(--line); background: var(--surface); padding: 14px 18px; }
.faq-item summary { cursor: pointer; font-weight: 600; font-size: 15px; color: var(--ink-950); list-style-position: outside; }
.faq-item[open] summary { color: var(--jade-800); }
.faq-item p { margin-top: 10px; color: var(--ink-soft); font-size: 14.5px; }

@media (max-width: 720px) {
  .form-grid { grid-template-columns: 1fr; }
}

/* ---------- 滚动编排（大厂官网标配的渐进显现与微交互） ---------- */

[data-reveal], .reveal { opacity: 0; transform: translateY(26px); transition: opacity 700ms cubic-bezier(0.22, 0.8, 0.3, 1), transform 700ms cubic-bezier(0.22, 0.8, 0.3, 1); }
[data-reveal].is-revealed, .reveal.is-revealed { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { [data-reveal], .reveal { opacity: 1; transform: none; transition: none; } }

.topbar { transition: box-shadow 200ms ease, background 200ms ease; }
.topbar.is-scrolled { box-shadow: 0 8px 24px rgba(16, 43, 40, 0.08); background: rgba(251, 250, 246, 0.97); }

.mall-card img { transition: transform 600ms cubic-bezier(0.22, 0.8, 0.3, 1); }
.mall-card:hover img { transform: scale(1.045); }

.hero__ghost, .hero__rail { will-change: transform; }

.faq-item[open] p { animation: faqIn 320ms ease; }
@keyframes faqIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .faq-item[open] p { animation: none; } }