/* ==========================================================================
   即通AI 营销站 · 样式表
   风格：Soft SaaS（白底 / 大留白 / 大圆角 / 克制的蓝色强调）
   品牌色与用户控制台保持一致（--primary: #3ea4ec），全站一个视觉体系
   ========================================================================== */

:root {
  /* 品牌 */
  --primary:        #3ea4ec;
  --primary-dark:   #1f86d2;
  --primary-deep:   #1266a8;
  --primary-soft:   #eaf5fe;
  --primary-faint:  #f5faff;

  /* 中性 */
  --bg:             #ffffff;
  --bg-subtle:      #f7fafc;
  --bg-muted:       #eef3f7;
  --text:           #16181d;
  --text-2:         #454b55;
  --muted:          #8b929c;
  --line:           #eceff3;
  --line-strong:    #dfe4ea;

  /* 语义 */
  --green:          #21a366;
  --green-soft:     #e8f7ef;
  --amber:          #d97706;
  --amber-soft:     #fef6e7;
  --violet:         #7c5cff;
  --violet-soft:    #f1edff;

  /* 形状 */
  --radius:         14px;
  --radius-sm:      9px;
  --radius-lg:      20px;
  --radius-full:    999px;
  --shadow-sm:      0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.03);
  --shadow-md:      0 4px 16px rgba(16,24,40,.06);
  --shadow-lg:      0 16px 40px rgba(16,24,40,.10);

  --container:      1140px;
  --nav-h:          64px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
          "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 20px); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -.02em; line-height: 1.25; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.center { text-align: center; }

/* ============================ 顶栏 ============================ */

.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  height: var(--nav-h);
  display: flex; align-items: center; gap: 28px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -.01em; flex: 0 0 auto; }
.nav-logo .mark {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  color: #fff; display: grid; place-items: center;
  font-size: 15px; font-weight: 700; letter-spacing: 0;
  box-shadow: 0 4px 12px rgba(62,164,236,.32);
}
.nav-menu { display: flex; align-items: center; gap: 4px; flex: 1 1 auto; }
.nav-menu > li { position: relative; }
.nav-menu a, .nav-menu .nav-trigger {
  display: flex; align-items: center; gap: 4px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  font-size: 14.5px; color: var(--text-2); white-space: nowrap;
  transition: background .15s, color .15s; cursor: pointer; background: none; border: 0;
  font-family: inherit;
}
.nav-menu a:hover, .nav-menu .nav-trigger:hover { background: var(--bg-subtle); color: var(--text); }
.nav-menu a.active { color: var(--primary-dark); font-weight: 600; background: var(--primary-soft); }
.nav-caret { width: 9px; height: 9px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); opacity: .5; }
.nav-sub {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 190px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); padding: 6px;
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity .16s, transform .16s, visibility .16s;
}
.nav-sub li a { display: block; padding: 9px 12px; border-radius: var(--radius-sm); font-size: 14px; }
.nav-sub li a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.nav-menu > li:hover .nav-sub,
.nav-menu > li:focus-within .nav-sub { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }

/* 已登录：用户名下拉菜单 */
.nav-user { position: relative; }
.nav-user .caret-down {
  width: 0; height: 0; margin-left: 1px;
  border-left: 4px solid transparent; border-right: 4px solid transparent;
  border-top: 5px solid currentColor; display: inline-block;
}
.user-menu {
  position: absolute; top: calc(100% + 8px); right: 0; min-width: 172px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md); padding: 6px; z-index: 120; display: none;
}
.user-menu.open { display: block; }
.user-menu a, .user-menu button {
  display: block; width: 100%; text-align: left; padding: 9px 12px;
  border-radius: var(--radius-sm); border: 0; background: none; cursor: pointer;
  font-family: inherit; font-size: 14px; color: var(--text); line-height: 1.4;
}
.user-menu a:hover, .user-menu button:hover { background: var(--primary-faint); color: var(--primary-dark); }
.user-menu .sep { height: 1px; background: var(--line); margin: 5px 2px; }
.user-menu .danger { color: #d64545; }
.user-menu .danger:hover { background: #fdf2f2; color: #c0392b; }

.nav-toggle {
  display: none; width: 38px; height: 38px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: #fff; cursor: pointer;
  flex-direction: column; justify-content: center; align-items: center; gap: 4px;
}
.nav-toggle span { display: block; width: 16px; height: 1.6px; background: var(--text-2); }

/* ============================ 按钮 ============================ */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  height: 40px; padding: 0 20px; border-radius: var(--radius-sm);
  font-size: 14.5px; font-weight: 500; font-family: inherit;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: background .15s, border-color .15s, color .15s, box-shadow .15s, transform .15s;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 2px 8px rgba(62,164,236,.28); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 4px 14px rgba(62,164,236,.36); transform: translateY(-1px); }
.btn-ghost { background: #fff; border-color: var(--line-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary-dark); background: var(--primary-faint); }
.btn-text { background: none; color: var(--primary-dark); padding: 0 8px; }
.btn-text:hover { background: var(--primary-soft); }
.btn-lg { height: 48px; padding: 0 28px; font-size: 15.5px; border-radius: 10px; }
.btn-sm { height: 34px; padding: 0 14px; font-size: 13.5px; }
.btn-block { width: 100%; }

/* ============================ 区块 ============================ */

.section { padding: 84px 0; }
.section-sm { padding: 56px 0; }
.section-subtle { background: var(--bg-subtle); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.eyebrow {
  font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--primary-dark); margin-bottom: 12px;
}
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: 32px; margin-bottom: 14px; }
.section-head p { font-size: 16px; color: var(--text-2); }

/* ============================ Hero ============================ */

.hero {
  position: relative; overflow: hidden;
  padding: 88px 0 76px;
  background:
    radial-gradient(900px 420px at 12% -10%, rgba(62,164,236,.13), transparent 60%),
    radial-gradient(700px 360px at 92% 4%, rgba(124,92,255,.10), transparent 62%),
    var(--bg);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero h1 { font-size: 46px; line-height: 1.18; letter-spacing: -.03em; margin-bottom: 20px; }
.hero h1 .grad {
  background: linear-gradient(115deg, var(--primary-dark), var(--violet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead { font-size: 17px; color: var(--text-2); max-width: 540px; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 26px; }
.hero-facts { display: flex; gap: 26px; flex-wrap: wrap; }
.hero-fact { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--text-2); }
.hero-fact b { color: var(--text); font-weight: 600; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 3px var(--green-soft); flex: 0 0 auto; }

/* Hero 右侧代码卡 */
.hero-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden;
}
.hero-card-head {
  display: flex; align-items: center; gap: 8px;
  padding: 13px 16px; border-bottom: 1px solid var(--line); background: var(--bg-subtle);
}
.hero-card-head .lights { display: flex; gap: 6px; }
.hero-card-head .lights i { width: 10px; height: 10px; border-radius: 50%; background: var(--line-strong); }
.hero-card-head .name { font-size: 12.5px; color: var(--muted); font-family: var(--mono); margin-left: 4px; }

/* ============================ 代码块 ============================ */

.code {
  margin: 0; padding: 18px; background: #fbfcfe;
  font-family: var(--mono); font-size: 12.8px; line-height: 1.75;
  color: #2b3440; overflow-x: auto; white-space: pre;
  border-radius: 0;
}
.code .k { color: var(--primary-dark); }
.code .s { color: #0b7285; }
.code .c { color: #a0aab8; }
.code .p { color: #7048e8; }
.code-block { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fbfcfe; }
.code-block .code { padding: 16px 18px; }

.tabs { display: flex; gap: 4px; padding: 8px 10px; background: var(--bg-subtle); border-bottom: 1px solid var(--line); }
.tab {
  padding: 6px 13px; border-radius: var(--radius-full); font-size: 13px; color: var(--text-2);
  cursor: pointer; border: 1px solid transparent; background: none; font-family: inherit;
  transition: background .15s, color .15s;
}
.tab:hover { background: #fff; }
.tab.active { background: #fff; border-color: var(--line-strong); color: var(--primary-dark); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ============================ 卡片网格 ============================ */

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; transition: border-color .18s, box-shadow .18s, transform .18s;
}
.card:hover { border-color: #d8e6f2; box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card h3 { font-size: 16.5px; margin-bottom: 9px; }
.card p { font-size: 14.2px; color: var(--text-2); overflow-wrap: break-word; }
.card code { overflow-wrap: anywhere; }  /* URL 放不下才整体换行，不在中间打断 */
.card-ico {
  width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
  background: var(--primary-soft); color: var(--primary-dark); margin-bottom: 16px;
}
.card-ico svg { width: 21px; height: 21px; }

/* 步骤 */
.step { position: relative; }
.step-no {
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  background: var(--primary); color: #fff; font-size: 13.5px; font-weight: 700; margin-bottom: 14px;
  box-shadow: 0 3px 10px rgba(62,164,236,.3);
}

/* 厂商 */
.vendor {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; transition: border-color .18s, box-shadow .18s;
}
.vendor:hover { border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.vendor-badge {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  font-size: 14px; font-weight: 700; flex: 0 0 auto;
}
.vendor-name { font-weight: 600; font-size: 14.5px; }
.vendor-sub { font-size: 12.5px; color: var(--muted); }

/* ============================ 表格 ============================ */

.table-wrap { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl thead th {
  text-align: left; padding: 13px 18px; background: var(--bg-subtle);
  font-size: 12.5px; font-weight: 600; color: var(--text-2); letter-spacing: .02em;
  border-bottom: 1px solid var(--line); white-space: nowrap;
}
.tbl tbody td { padding: 14px 18px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl tbody tr:hover { background: var(--primary-faint); }
.tbl .name { font-weight: 600; font-family: var(--mono); font-size: 13.2px; }
.tbl .num { font-family: var(--mono); font-size: 13.5px; }
.tbl .price-in { color: var(--text); }
.tbl .price-out { color: var(--primary-dark); font-weight: 600; }

.pill {
  display: inline-block; padding: 2px 9px; border-radius: var(--radius-full);
  font-size: 12px; font-weight: 500; background: var(--bg-muted); color: var(--text-2);
}
.pill-blue { background: var(--primary-soft); color: var(--primary-deep); }
.pill-green { background: var(--green-soft); color: #16794c; }
.pill-violet { background: var(--violet-soft); color: #5b3fd6; }
.pill-amber { background: var(--amber-soft); color: #a35a05; }

/* ============================ 模型筛选 ============================ */

.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; align-items: center; }
.filter-bar .label { font-size: 13px; color: var(--muted); margin-right: 2px; }
.chip {
  padding: 6px 14px; border-radius: var(--radius-full); border: 1px solid var(--line-strong);
  background: #fff; font-size: 13.5px; color: var(--text-2); cursor: pointer; font-family: inherit;
  transition: all .15s;
}
.chip:hover { border-color: var(--primary); color: var(--primary-dark); }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 500; }
.search-box { position: relative; flex: 1 1 220px; max-width: 300px; }
.search-box input {
  width: 100%; height: 38px; padding: 0 14px 0 36px; border-radius: var(--radius-full);
  border: 1px solid var(--line-strong); background: #fff; font-size: 14px; font-family: inherit;
  color: var(--text); outline: none; transition: border-color .15s, box-shadow .15s;
}
.search-box input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.search-box svg { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); width: 15px; height: 15px; color: var(--muted); }

.count-note { font-size: 13.5px; color: var(--muted); margin: 4px 0 18px; }

/* ============================ 其它块 ============================ */

.notice {
  display: flex; gap: 12px; padding: 16px 18px; border-radius: var(--radius);
  background: var(--primary-faint); border: 1px solid #d6ebfb; font-size: 14px; color: var(--text-2);
}
.notice svg { width: 18px; height: 18px; color: var(--primary-dark); flex: 0 0 auto; margin-top: 2px; }
.notice-warn { background: var(--amber-soft); border-color: #f5e0b8; }
.notice-warn svg { color: var(--amber); }

.cta-band {
  background: linear-gradient(120deg, #17699f, var(--primary-dark) 46%, var(--primary));
  color: #fff; border-radius: var(--radius-lg); padding: 52px 48px;
  display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap;
}
.cta-band h2 { font-size: 28px; color: #fff; margin-bottom: 10px; }
.cta-band p { color: rgba(255,255,255,.86); font-size: 15.5px; }
.cta-band .btn-primary { background: #fff; color: var(--primary-deep); box-shadow: 0 4px 16px rgba(0,0,0,.14); }
.cta-band .btn-primary:hover { background: #fff; transform: translateY(-1px); }
.cta-band .btn-ghost { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.42); color: #fff; }
.cta-band .btn-ghost:hover { background: rgba(255,255,255,.2); color: #fff; }

/* 页内导航（文档页左侧 / 关于页） */
.doc-layout { display: grid; grid-template-columns: 232px 1fr; gap: 48px; align-items: start; }
.doc-side { position: sticky; top: calc(var(--nav-h) + 24px); }
.doc-side h4 { font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 20px 0 8px; }
.doc-side h4:first-child { margin-top: 0; }
.doc-side a { display: block; padding: 7px 12px; border-radius: var(--radius-sm); font-size: 14px; color: var(--text-2); border-left: 2px solid transparent; }
.doc-side a:hover { background: var(--bg-subtle); color: var(--text); }
.doc-side a.active { color: var(--primary-dark); background: var(--primary-soft); font-weight: 500; }
.doc-side a.active { border-left-color: var(--primary); }
.doc-body h2 { font-size: 24px; margin: 44px 0 14px; }
.doc-body h2:first-child { margin-top: 0; }
.doc-body h3 { font-size: 17px; margin: 28px 0 10px; }
.doc-body p { color: var(--text-2); margin-bottom: 12px; }
.doc-body ul.bullets { margin: 10px 0 16px; }
.doc-body ul.bullets li { position: relative; padding-left: 20px; margin-bottom: 7px; color: var(--text-2); }
.doc-body ul.bullets li::before {
  content: ''; position: absolute; left: 4px; top: 11px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--primary);
}
.doc-body .code-block { margin: 14px 0 20px; }
.doc-body table.tbl { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.doc-body .table-wrap { margin: 14px 0 22px; }

/* 锚点卡片（关于页） */
.info-row { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.info-row:last-child { border-bottom: 0; }
.info-row .k { width: 132px; flex: 0 0 auto; color: var(--muted); font-size: 14px; }
.info-row .v { color: var(--text); font-size: 14.5px; }

/* 待填占位（config.js 里还是「待填写」的值） */
.todo {
  color: var(--muted); border-bottom: 1px dashed var(--line-strong); cursor: help;
}

/* ============================ 页脚 ============================ */

.footer { background: var(--bg-subtle); border-top: 1px solid var(--line); padding: 56px 0 28px; margin-top: 8px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer h4 { font-size: 13.5px; margin-bottom: 14px; color: var(--text); }
.footer li { margin-bottom: 9px; }
.footer a { font-size: 13.8px; color: var(--text-2); }
.footer a:hover { color: var(--primary-dark); }
.footer .about { font-size: 13.8px; color: var(--text-2); margin-top: 14px; max-width: 320px; }
.footer-bottom {
  border-top: 1px solid var(--line); padding-top: 22px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: var(--muted);
}

/* ============================ 响应式 ============================ */

@media (max-width: 980px) {
  .hero { padding: 56px 0 48px; }
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero h1 { font-size: 34px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  /* 三步卡：2 列时第 3 张跨满整行，不再孤零零靠左 */
  .steps-grid > :last-child:nth-child(3) { grid-column: 1 / -1; }
  .doc-layout { grid-template-columns: 1fr; gap: 24px; }
  .doc-side { position: static; display: flex; flex-wrap: wrap; gap: 6px; }
  .doc-side h4 { width: 100%; margin: 10px 0 4px; }
  .doc-side a { padding: 6px 12px; border: 1px solid var(--line); border-radius: var(--radius-full); border-left: 1px solid var(--line); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .cta-band { padding: 36px 28px; }
  .section { padding: 60px 0; }
}

@media (max-width: 720px) {
  .nav-menu {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 12px 16px 20px; box-shadow: var(--shadow-md);
    max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
    display: none;
  }
  .nav-menu.open { display: flex; }
  .nav-menu .nav-sub { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; padding: 0 0 0 12px; }
  .nav-toggle { display: flex; }
  .nav-actions .btn-ghost { display: none; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .section-head h2 { font-size: 24px; }
  .tbl thead th, .tbl tbody td { padding: 11px 12px; }
  .footer-grid { grid-template-columns: 1fr; }
  .table-wrap { overflow-x: auto; }
  table.tbl { min-width: 520px; }
  /* 窄屏代码不再横向截断，直接折行（示例都不长，折行比滚动直观） */
  .code { white-space: pre-wrap; word-break: break-all; }
}