/* ===========================================================
   AI Gateway 中转平台 — 深度调研文档设计系统 (self-contained, offline)
   基于 form/ 套件样式，主题改为 tech-blue / cyan
   =========================================================== */

:root {
  --ink:        #14182b;
  --ink-soft:   #41475f;
  --muted:      #69708a;
  --line:       #e4e7f0;
  --line-soft:  #eef0f7;
  --bg:         #ffffff;
  --bg-soft:    #f8fafd;
  --bg-tint:    #eef4fb;

  --brand:      #1d6fe0;   /* tech blue */
  --brand-2:    #14b8c4;   /* cyan-teal */
  --brand-ink:  #134a93;
  --accent:     #e8845a;   /* warm coral */
  --gold:       #c79a3a;

  --ok:         #1f9d6b;
  --ok-bg:      #e7f7f0;
  --warn:       #c4761b;
  --warn-bg:    #fdf3e6;
  --danger:     #c2415a;
  --danger-bg:  #fdecf0;
  --info:       #2f6fd0;
  --info-bg:    #ecf2fc;

  --radius:     14px;
  --radius-sm:  9px;
  --shadow:     0 1px 2px rgba(20,24,43,.05), 0 8px 28px rgba(20,24,43,.07);
  --shadow-sm:  0 1px 2px rgba(20,24,43,.06), 0 3px 10px rgba(20,24,43,.05);

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

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg-soft);
  line-height: 1.72;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap {
  max-width: 1180px; margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.topbar .logo {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 700; color: var(--ink); text-decoration: none; font-size: 15px;
}
.topbar .dot {
  width: 22px; height: 22px; border-radius: 7px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  display: inline-block; box-shadow: var(--shadow-sm);
}
.topbar nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.topbar nav a {
  font-size: 13.5px; color: var(--ink-soft); text-decoration: none;
  padding: 6px 12px; border-radius: 999px; white-space: nowrap;
}
.topbar nav a:hover { background: var(--bg-tint); color: var(--brand-ink); }
.topbar nav a.active { background: var(--brand); color: #fff; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(900px 380px at 12% -10%, rgba(20,184,196,.16), transparent 60%),
    radial-gradient(700px 360px at 96% 0%, rgba(29,111,224,.14), transparent 55%),
    linear-gradient(180deg, #ffffff, var(--bg-soft));
  border-bottom: 1px solid var(--line);
}
.hero .wrap { max-width: 1180px; margin: 0 auto; padding: 54px 24px 40px; }
.kicker {
  display: inline-block; font-size: 12.5px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--brand); font-weight: 700; margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(28px, 4.4vw, 46px); line-height: 1.12; margin: 0 0 14px;
  letter-spacing: -.01em; color: var(--ink);
}
.hero p.lede { font-size: 18px; color: var(--ink-soft); max-width: 760px; margin: 0 0 22px; }
.meta { display: flex; gap: 10px; flex-wrap: wrap; }
.meta .chip {
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; font-size: 13px; color: var(--ink-soft); box-shadow: var(--shadow-sm);
}
.meta .chip b { color: var(--ink); font-weight: 700; }

/* ---------- Layout ---------- */
.layout { max-width: 1180px; margin: 0 auto; padding: 36px 24px 80px; display: grid; gap: 36px; }
@media (min-width: 980px) {
  .layout.with-toc { grid-template-columns: 248px 1fr; align-items: start; }
}
.toc {
  position: sticky; top: 70px; align-self: start;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 18px; box-shadow: var(--shadow-sm); font-size: 14px;
}
.toc h4 { margin: 0 0 10px; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.toc a { display: block; color: var(--ink-soft); text-decoration: none; padding: 5px 9px; border-radius: 7px; border-left: 2px solid transparent; }
.toc a:hover { background: var(--bg-tint); color: var(--brand-ink); }
.toc a.sub { padding-left: 20px; font-size: 13px; color: var(--muted); }
@media (max-width: 979px) { .toc { display: none; } }

main { min-width: 0; }

/* ---------- Sections & typography ---------- */
section { scroll-margin-top: 78px; margin-bottom: 30px; }
section > h2 {
  font-size: 23px; letter-spacing: -.01em; margin: 8px 0 6px; color: var(--ink);
  padding-bottom: 8px; border-bottom: 2px solid var(--line-soft);
}
section > h2 .num {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 27px; height: 27px; padding: 0 7px; margin-right: 10px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff;
  border-radius: 8px; font-size: 14px; font-weight: 700; vertical-align: 2px;
}
h3 { font-size: 17.5px; margin: 22px 0 8px; color: var(--brand-ink); }
h4 { font-size: 15px; margin: 16px 0 6px; color: var(--ink); }
p { margin: 10px 0; }
a { color: var(--brand); }
strong, b { color: var(--ink); }
ul, ol { margin: 10px 0; padding-left: 22px; }
li { margin: 5px 0; }
code {
  font-family: var(--mono); font-size: .88em; background: var(--bg-tint);
  border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; color: var(--brand-ink);
}
pre { background: #0f1830; color: #d7e3f7; border-radius: var(--radius-sm); padding: 14px 16px; overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.6; margin: 14px 0; }
pre code { background: none; border: none; color: inherit; padding: 0; font-size: inherit; }
hr { border: none; border-top: 1px solid var(--line); margin: 26px 0; }

/* ---------- Cards & grid ---------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow-sm);
}
.card.lead { border-left: 4px solid var(--brand); }
.grid { display: grid; gap: 16px; }
.grid.c2 { grid-template-columns: repeat(2, 1fr); }
.grid.c3 { grid-template-columns: repeat(3, 1fr); }
.grid.c4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 860px) { .grid.c2, .grid.c3, .grid.c4 { grid-template-columns: 1fr; } }

.stat { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px; box-shadow: var(--shadow-sm); }
.stat .big { font-size: 28px; font-weight: 800; color: var(--brand-ink); letter-spacing: -.02em; line-height: 1.1; }
.stat .lbl { font-size: 13px; color: var(--muted); margin-top: 4px; }
.stat .src { font-size: 11.5px; color: #9b97ad; margin-top: 8px; }

.feature-h { font-weight: 700; color: var(--ink); display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.feature-h .ic {
  width: 26px; height: 26px; border-radius: 8px; display: inline-flex; align-items: center; justify-content: center;
  background: var(--bg-tint); color: var(--brand); font-size: 15px; flex: none;
}

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); margin: 14px 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; background: #fff; }
thead th {
  background: var(--bg-tint); color: var(--brand-ink); text-align: left; font-weight: 700;
  padding: 11px 13px; border-bottom: 1px solid var(--line); white-space: nowrap; position: sticky; top: 0;
}
tbody td { padding: 10px 13px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:nth-child(even) { background: var(--bg-soft); }

/* ---------- Callouts ---------- */
.callout { border-radius: var(--radius-sm); padding: 14px 16px 14px 16px; margin: 14px 0; border: 1px solid; font-size: 14.5px; }
.callout .t { font-weight: 700; margin-bottom: 3px; display: flex; align-items: center; gap: 7px; }
.callout p:first-child { margin-top: 0; } .callout p:last-child { margin-bottom: 0; }
.callout.ok    { background: var(--ok-bg);    border-color: #bfe8d6; color: #155e44; }
.callout.warn  { background: var(--warn-bg);  border-color: #f3dcb8; color: #80500f; }
.callout.danger{ background: var(--danger-bg);border-color: #f4c2cf; color: #8c213a; }
.callout.info  { background: var(--info-bg);  border-color: #c8dbf6; color: #1f4c93; }
.callout.brand { background: var(--bg-tint);  border-color: #cfe0f6; color: var(--brand-ink); }

/* ---------- Badges / tags ---------- */
.tag { display: inline-block; font-size: 11.5px; font-weight: 700; padding: 2px 9px; border-radius: 999px; letter-spacing: .02em; white-space: nowrap; }
.tag.p0 { background: #e3edff; color: #1c4fa0; }
.tag.p1 { background: #e0f6f8; color: #0d6b73; }
.tag.p2 { background: #f0eef2; color: #6a6577; }
.tag.hi { background: var(--ok-bg); color: #155e44; }
.tag.md { background: var(--warn-bg); color: #80500f; }
.tag.lo { background: #f1eef2; color: #6a6577; }
.tag.new{ background: var(--danger-bg); color: #8c213a; }
.tag.ph { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; }
.tag.green { background: var(--ok-bg); color: #155e44; }
.tag.amber { background: var(--warn-bg); color: #80500f; }
.tag.red { background: var(--danger-bg); color: #8c213a; }

/* ---------- Timeline / phases ---------- */
.phase { display: grid; grid-template-columns: 130px 1fr; gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); margin: 12px 0; }
.phase .when { background: linear-gradient(160deg, var(--brand), var(--brand-2)); color: #fff; padding: 16px; font-weight: 700; }
.phase .when small { display: block; font-weight: 500; opacity: .85; font-size: 12px; margin-top: 3px; }
.phase .what { padding: 16px 18px; background: #fff; }
@media (max-width: 620px){ .phase { grid-template-columns: 1fr; } }

/* ---------- Doc cards (portal) ---------- */
.doc-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); text-decoration: none; color: inherit; transition: transform .12s ease, box-shadow .12s ease; }
.doc-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #c4d6f2; }
.doc-card .ic { width: 42px; height: 42px; border-radius: 11px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 20px; margin-bottom: 14px; }
.doc-card h3 { margin: 0 0 6px; color: var(--ink); }
.doc-card p { margin: 0 0 14px; color: var(--ink-soft); font-size: 14px; flex: 1; }
.doc-card .go { font-size: 13.5px; font-weight: 700; color: var(--brand); }

/* ---------- ASCII / architecture diagram ---------- */
.diagram { background: #0f1830; color: #cfe0f6; border-radius: var(--radius-sm); padding: 18px 20px; overflow-x: auto; font-family: var(--mono); font-size: 12.5px; line-height: 1.5; margin: 14px 0; white-space: pre; }

/* ---------- Footer ---------- */
footer.docfoot { border-top: 1px solid var(--line); background: #fff; }
footer.docfoot .wrap { max-width: 1180px; margin: 0 auto; padding: 26px 24px 40px; color: var(--muted); font-size: 13px; }
footer.docfoot b { color: var(--ink-soft); }
.disclaimer { background: var(--bg-tint); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 15px; font-size: 12.5px; color: var(--ink-soft); margin-top: 14px; }

.src-note { font-size: 12px; color: #9b97ad; }
.lead-sub { color: var(--ink-soft); font-size: 15.5px; margin-top: -2px; }

/* ---------- Print ---------- */
@media print {
  .topbar, .toc { display: none !important; }
  body { background: #fff; font-size: 12px; }
  .layout.with-toc { grid-template-columns: 1fr !important; }
  .card, .stat, .table-wrap, .phase, .doc-card { box-shadow: none; break-inside: avoid; }
  .hero { background: #fff; }
  a { color: var(--ink); text-decoration: none; }
  section { margin-bottom: 16px; }
}