/* 信山行官网 · 设计系统 —— 纸墨为底，印章为记
   色板与字体的唯一定义处；改视觉先改 BRAND.md 再改这里 */

:root {
  --seal: #c6432d;          /* 印泥红：主行动色 */
  --seal-dark: #a83322;
  --seal-soft: #fbeee9;
  --ink: #201f1c;           /* 墨 */
  --ink-2: #55524b;         /* 淡墨 */
  --ink-3: #8a867d;
  --paper: #faf8f5;         /* 纸 */
  --card: #ffffff;
  --line: #e8e4dd;
  --indigo: #1f3a5f;        /* 黛蓝：辅助 */
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(32, 31, 28, .04), 0 8px 28px rgba(32, 31, 28, .06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ── 印章徽记 ─────────────────────────────── */
.seal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 8px;
  background: var(--seal); color: #fff;
  font-family: var(--serif); font-weight: 700; font-size: 16px;
  letter-spacing: 1px; line-height: 1;
  box-shadow: inset 0 0 0 1.5px rgba(255, 255, 255, .35), inset 0 0 0 4px var(--seal);
  flex: none;
}
.seal--lg { width: 64px; height: 64px; font-size: 25px; border-radius: 12px; }

/* ── 顶栏 ─────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 248, 245, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.nav__brand { display: flex; align-items: center; gap: 10px; }
/* 品牌层级：善任 = 产品（主），信山行 = 公司/出品方（副）。未来多产品时改为公司站 + 产品页 */
/* 印章即产品名，旁边只放出品方与一句定位，避免「善任」出现两次 */
.brand { display: flex; flex-direction: column; line-height: 1.3; gap: 1px; }
.brand small { font-family: var(--sans); font-weight: 500; font-size: 11px; color: var(--ink-3); letter-spacing: .06em; }
.brand .brand__by { font-family: var(--serif); font-size: 13.5px; font-weight: 600; color: var(--ink-2); letter-spacing: .08em; }
.nav__links { display: flex; gap: 22px; margin-left: 12px; font-size: 14.5px; color: var(--ink-2); }
.nav__links a:hover { color: var(--ink); }
.nav__spacer { flex: 1; }
.nav__burger { display: none; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 9px; background: var(--card); cursor: pointer; flex-direction: column; justify-content: center; align-items: center; gap: 5px; }
.nav__burger i { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }
.nav__auth { display: flex; align-items: center; gap: 14px; font-size: 14.5px; }

/* ── 按钮 ─────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: 10px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: all .15s ease;
  font-family: var(--sans);
}
.btn--primary { background: var(--seal); color: #fff; }
.btn--primary:hover { background: var(--seal-dark); transform: translateY(-1px); }
.btn--ghost { border-color: var(--line); background: var(--card); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink-3); }
.btn--lg { padding: 14px 28px; font-size: 16px; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: .45; cursor: not-allowed; transform: none !important; }

/* ── Hero ─────────────────────────────────── */
.hero { padding: 96px 0 80px; overflow: hidden; }
/* 单栏居中：首屏只放定位与行动，不放示意图（示意图在「学习闭环」一节） */
.hero__inner { max-width: 760px; margin: 0 auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .12em;
  color: var(--seal); text-transform: uppercase;
}
/* 首屏眉题带产品名：页面上必须能一眼看出「善任」是产品名（印章只是徽记） */
.eyebrow--product b { font-family: var(--serif); font-size: 22px; font-weight: 700; letter-spacing: .1em; padding-right: 10px; border-right: 1.5px solid var(--seal); margin-right: 4px; line-height: 1; }
.eyebrow::before { content: ""; width: 22px; height: 1.5px; background: var(--seal); }
.hero h1 {
  font-family: var(--serif); font-size: 52px; line-height: 1.22;
  font-weight: 700; margin: 18px 0 10px; letter-spacing: .01em;
}
.hero h1 em { font-style: normal; color: var(--seal); }
.hero__motto { font-family: var(--serif); font-size: 18px; color: var(--indigo); margin-bottom: 14px; letter-spacing: .06em; }
.hero__sub strong { display: block; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.hero__sub { font-size: 17px; color: var(--ink-2); max-width: 34em; margin: 0 auto 30px; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; justify-content: center; }
.hero__note { font-size: 13px; color: var(--ink-3); margin-top: 18px; }

/* Hero 右侧：后台仪表盘拟物 */
.mock { position: relative; padding: 0 0 46px; margin: 56px auto 0; max-width: 560px; }
/* 假窗口标题条：让右侧读成「一张后台截图」，而不是几张漂着的卡片 */
.mock__bar-title {
  display: flex; align-items: center; gap: 6px; padding: 8px 14px; margin-bottom: 12px;
  background: #ece8e1; border: 1px solid var(--line); border-radius: 10px; font-size: 12px; color: var(--ink-3);
}
.mock__bar-title i { width: 9px; height: 9px; border-radius: 50%; background: #d3cec4; }
.mock__bar-title span { margin-left: 8px; letter-spacing: .04em; }
.mock__panel {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px 20px; margin-bottom: 14px;
}
.mock__panel h4 { font-size: 13px; color: var(--ink-3); font-weight: 600; margin-bottom: 10px; letter-spacing: .04em; }
.mock__row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-top: 1px dashed var(--line); font-size: 14px; }
.mock__row:first-of-type { border-top: 0; }
.mock__tag { font-size: 12px; padding: 2px 10px; border-radius: 99px; background: var(--seal-soft); color: var(--seal); font-weight: 600; }
.mock__tag--ok { background: #e9f3ec; color: #21713c; }
.mock__tag--dim { background: #f1efe9; color: var(--ink-3); }
.mock__bar { height: 8px; border-radius: 99px; background: #f1efe9; overflow: hidden; margin-top: 6px; }
.mock__bar i { display: block; height: 100%; width: 62%; background: linear-gradient(90deg, var(--indigo), #3f6db3); }
.mock__float {
  position: absolute; right: -14px; bottom: 0;
  background: var(--ink); color: #f5f2ec; border-radius: 12px;
  padding: 12px 16px; font-size: 13px; line-height: 1.6;
  box-shadow: 0 16px 40px rgba(32,31,28,.25);
}
.mock__float b { color: #f0b429; }

/* ── 区块骨架 ─────────────────────────────── */
.section { padding: 84px 0; }
.section--alt { background: #f4f1ec; border-block: 1px solid var(--line); }
.section__head { max-width: 640px; margin-bottom: 46px; }
.section__head h2 { font-family: var(--serif); font-size: 34px; line-height: 1.3; margin: 14px 0 12px; }
.section__head p { color: var(--ink-2); font-size: 16.5px; }

/* ── 三面原则 ─────────────────────────────── */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.principle {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; box-shadow: var(--shadow);
}
.principle__num { font-family: var(--serif); font-size: 15px; color: var(--seal); font-weight: 700; }
.principle h3 { font-family: var(--serif); font-size: 21px; margin: 10px 0 8px; }
.principle p { font-size: 14.5px; color: var(--ink-2); }

/* ── 学习闭环 ─────────────────────────────── */
.loop { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: step; }
.loop__step { position: relative; padding: 0 22px 0 0; }
.loop__step + .loop__step { padding-left: 22px; border-left: 1px dashed var(--line); }
.loop__step::before {
  counter-increment: step; content: counter(step, cjk-ideographic);
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--ink); color: #f5f2ec;
  font-family: var(--serif); font-size: 15px; margin-bottom: 14px;
}
.loop__step h3 { font-size: 17px; margin-bottom: 6px; font-family: var(--serif); }
.loop__step p { font-size: 13.5px; color: var(--ink-2); }
.loop__closing { margin-top: 40px; text-align: center; font-family: var(--serif); font-size: 17px; color: var(--indigo); }

/* ── 功能矩阵 ─────────────────────────────── */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px; transition: all .15s ease;
}
.feature:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.feature h3 { font-size: 16.5px; margin-bottom: 6px; }
.feature p { font-size: 13.8px; color: var(--ink-2); }
.feature__icon { font-size: 20px; margin-bottom: 12px; display: block; }

/* ── 数据主权 ─────────────────────────────── */
.sov { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.sov ul { list-style: none; display: grid; gap: 16px; }
.sov li { display: flex; gap: 12px; font-size: 15.5px; }
.sov li::before { content: "印"; flex: none; width: 26px; height: 26px; border-radius: 6px; background: var(--seal); color: #fff; font-family: var(--serif); font-size: 13px; display: inline-flex; align-items: center; justify-content: center; margin-top: 2px; }
.sov__quote {
  background: var(--ink); color: #f5f2ec; border-radius: var(--radius);
  padding: 40px 36px; font-family: var(--serif); line-height: 2.1; font-size: 17px;
}
.sov__quote strong { color: #f0b429; font-weight: 700; }
.sov__quote small { display: block; margin-top: 18px; font-family: var(--sans); font-size: 12.5px; color: #b7b2a6; }

/* ── 定价 ─────────────────────────────────── */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.price {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 28px; display: flex; flex-direction: column; position: relative;
}
.price--hot { border-color: var(--seal); box-shadow: 0 12px 36px rgba(198, 67, 45, .12); }
.price__badge {
  position: absolute; top: -13px; left: 28px;
  background: var(--seal); color: #fff; font-size: 12px; font-weight: 600;
  padding: 3px 12px; border-radius: 99px;
}
.price h3 { font-family: var(--serif); font-size: 20px; }
.price__amount { margin: 14px 0 4px; font-size: 38px; font-weight: 700; font-family: var(--serif); }
.price__amount small { font-size: 14px; font-weight: 400; color: var(--ink-3); font-family: var(--sans); }
.price__for { font-size: 13.5px; color: var(--ink-3); margin-bottom: 20px; }
.price ul { list-style: none; display: grid; gap: 10px; font-size: 14.2px; margin-bottom: 26px; }
.price li { padding-left: 22px; position: relative; }
.price li::before { content: "✓"; position: absolute; left: 0; color: var(--seal); font-weight: 700; }
.price .btn { margin-top: auto; }
.pricing__note { text-align: center; margin-top: 26px; font-size: 13px; color: var(--ink-3); }

/* ── 下载 ─────────────────────────────────── */
.dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.dl__card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px;
}
.dl__card h3 { font-size: 17px; display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.dl__env { font-size: 12.5px; color: var(--ink-3); margin-bottom: 14px; }
.dl__card p { font-size: 14px; color: var(--ink-2); margin-bottom: 18px; min-height: 3.2em; }
.dl__cmd {
  display: block; background: #23221f; color: #e7e2d8; border-radius: 8px;
  font: 12.5px/1.7 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  padding: 12px 14px; margin-bottom: 16px; overflow-x: auto; white-space: pre;
}
.dl__note { margin-top: 24px; font-size: 13px; color: var(--ink-3); }

/* ── FAQ ──────────────────────────────────── */
.faq { display: grid; gap: 12px; max-width: 820px; }
.faq details {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 22px;
}
.faq summary { cursor: pointer; font-weight: 600; font-size: 15.5px; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::after { content: "＋"; color: var(--ink-3); font-size: 18px; }
.faq details[open] summary::after { content: "－"; }
.faq details p { margin-top: 12px; font-size: 14.5px; color: var(--ink-2); }

/* ── CTA 横幅 ─────────────────────────────── */
.band { background: var(--ink); color: #f5f2ec; padding: 72px 0; }
.band__inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.band h2 { font-family: var(--serif); font-size: 30px; line-height: 1.4; }
.band p { color: #b7b2a6; margin-top: 8px; font-size: 15px; }

/* ── 页脚 ─────────────────────────────────── */
.footer { padding: 56px 0 40px; border-top: 1px solid var(--line); font-size: 13.5px; color: var(--ink-2); }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 36px; }
.footer h4 { font-size: 13px; color: var(--ink-3); letter-spacing: .08em; margin-bottom: 12px; }
.footer ul { list-style: none; display: grid; gap: 8px; }
.footer a:hover { color: var(--seal); }
.footer__legal { border-top: 1px solid var(--line); padding-top: 22px; font-size: 12.5px; color: var(--ink-3); line-height: 2; }
.footer__legal a { color: var(--ink-3); text-decoration: underline; text-underline-offset: 3px; }
.footer__legal a:hover { color: var(--ink-2); }

/* ── 认证 / 控制台页 ──────────────────────── */
.auth-wrap { min-height: calc(100vh - 64px); display: grid; place-items: center; padding: 48px 24px; }
.auth-card {
  width: 100%; max-width: 420px; background: var(--card);
  border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); padding: 36px 34px;
}
.auth-card h1 { font-family: var(--serif); font-size: 24px; margin-bottom: 4px; }
.auth-card > p { font-size: 13.5px; color: var(--ink-3); margin-bottom: 22px; }
.tabs { display: flex; gap: 4px; background: #f1efe9; border-radius: 10px; padding: 4px; margin-bottom: 22px; }
.tabs button {
  flex: 1; border: 0; background: transparent; padding: 8px; border-radius: 8px;
  font-size: 14px; font-weight: 600; color: var(--ink-3); cursor: pointer; font-family: var(--sans);
}
.tabs button.on { background: var(--card); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-2); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 14.5px; font-family: var(--sans); background: var(--paper);
}
.field input:focus { outline: none; border-color: var(--seal); background: #fff; }
.form-msg { min-height: 20px; font-size: 13px; margin: 6px 0 10px; }
.form-msg.err { color: var(--seal-dark); }
.form-msg.ok { color: #21713c; }

.console { max-width: 880px; margin: 0 auto; padding: 56px 24px 96px; }
.console h1 { font-family: var(--serif); font-size: 28px; margin-bottom: 6px; }
.console__sub { color: var(--ink-2); margin-bottom: 36px; }
.console section { margin-bottom: 44px; }
.console h2 { font-family: var(--serif); font-size: 20px; margin-bottom: 16px; padding-left: 12px; border-left: 3px solid var(--seal); }
textarea {
  width: 100%; min-height: 96px; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: 10px; font-family: var(--sans); font-size: 14.5px; background: var(--paper); resize: vertical;
}
textarea:focus { outline: none; border-color: var(--seal); background: #fff; }
select {
  padding: 10px 14px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 14.5px; font-family: var(--sans); background: var(--card);
}

/* ── 响应式 ───────────────────────────────── */
@media (max-width: 960px) {
  .sov { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 38px; }
  .principles, .features, .pricing, .dl { grid-template-columns: 1fr 1fr; }
  .loop { grid-template-columns: 1fr; gap: 26px; }
  .loop__step + .loop__step { padding-left: 0; border-left: 0; padding-top: 4px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .nav__links { display: none; }
  /* 窄屏：汉堡按钮展开为顶栏下方的纵向菜单 */
  .nav__burger { display: flex; order: 3; }
  body.menu-open .nav__links {
    display: flex; flex-direction: column; gap: 0; margin: 0;
    position: absolute; left: 0; right: 0; top: 64px;
    background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
  }
  body.menu-open .nav__links a { padding: 14px 24px; border-top: 1px solid var(--line); font-size: 15.5px; }
}
@media (max-width: 640px) {
  .nav__inner { gap: 12px; }
  .nav__brand { white-space: nowrap; }
  .brand small { display: none; }
  .brand .brand__by { display: block; }
  .nav__auth { gap: 10px; white-space: nowrap; font-size: 13.5px; }
  .nav__auth .btn { padding: 8px 14px; font-size: 13.5px; }
  .principles, .features, .pricing, .dl { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 48px; }
  .hero__inner { text-align: left; }
  .hero__cta { justify-content: flex-start; }
  .hero__sub { margin-left: 0; }
  .hero h1 { font-size: 32px; }
  .section { padding: 60px 0; }
  .mock { padding-bottom: 0; margin-top: 0; }
  .mock__float { position: static; margin-top: 4px; }
}

/* ── 首页留资表单（预告站） ───────────────────────────────── */
.price__amount--ask { font-size: 26px; color: var(--ink-2); }
.inquiry {
  max-width: 720px; margin: 40px auto 0; padding: 28px;
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
}
.inquiry__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.inquiry .field label b { color: var(--seal); font-weight: 600; }
.inquiry select {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line);
  border-radius: 9px; font-size: 14.5px; background: var(--paper); color: var(--ink);
}
.inquiry textarea { min-height: 96px; }
.inquiry__hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.inquiry__consent { font-size: 12.5px; color: var(--ink-3); line-height: 1.7; margin: 6px 0 4px; }
.inquiry__consent a { color: var(--seal); }
@media (max-width: 640px) { .inquiry { padding: 20px; } .inquiry__grid { grid-template-columns: 1fr; } }

/* ── 法律文本页（terms / privacy）───────────────────────────── */
.legal section { margin-bottom: 34px; }
.legal p { font-size: 14.5px; line-height: 1.95; color: var(--ink-2); margin-bottom: 12px; }
.legal p:last-child { margin-bottom: 0; }
.legal b { color: var(--ink); font-weight: 600; }
.legal a { color: var(--seal); text-decoration: underline; text-underline-offset: 3px; }
.legal h3 { font-size: 15px; font-weight: 600; color: var(--ink); margin: 18px 0 8px; }
.legal ul { margin: 0 0 12px; padding-left: 20px; }
.legal li { font-size: 14.5px; line-height: 1.95; color: var(--ink-2); margin-bottom: 4px; }
.legal li::marker { color: var(--ink-3); }
.legal__lead {
  background: var(--card); border: 1px solid var(--line); border-left: 3px solid var(--seal);
  border-radius: 10px; padding: 18px 20px; margin-bottom: 0 !important;
}
.legal__foot { border-top: 1px solid var(--line); padding-top: 20px; font-size: 13px; color: var(--ink-3); }
.legal__foot a { color: var(--ink-3); }