:root {
  --bg: #fbfaf7;
  --panel: #ffffff;
  --ink: #1d1e22;
  --muted: #6c7078;
  --line: #e7e3da;
  --accent: #2456d6;
  --accent-soft: #edf2ff;
  --green: #0f7a58;
  --green-soft: #e8f5ef;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(24, 26, 32, .04), 0 8px 24px rgba(24, 26, 32, .05);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: clamp(20px, 4vw, 48px);
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page { max-width: 1120px; margin: 0 auto; }

h1 {
  margin: 0 0 clamp(16px, 2.4vw, 28px);
  font-size: clamp(22px, 2.6vw, 34px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.25;
}

/* ---------- 流程图卡片 ---------- */

.flow {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(14px, 2.2vw, 26px);
}

.flow-svg { display: block; width: 100%; height: auto; }
.flow-narrow { display: none; max-width: 520px; margin: 0 auto; }

/* 盒子 */
.flow .f-box {
  fill: #fff;
  stroke: var(--line);
  stroke-width: 1.6;
  transition: stroke .18s ease, filter .18s ease;
}
.flow .f-accent { fill: var(--accent-soft); stroke: #c7d5ff; }
.flow .f-red { fill: #fdf0ef; stroke: #f0c9c6; }
.flow .f-green { fill: var(--green-soft); stroke: #bfe3d3; }

/* 文字 */
.flow text { font-family: inherit; }
.flow .f-t { font-size: 20px; font-weight: 700; fill: var(--ink); letter-spacing: -.015em; }
.flow .f-s { font-size: 14px; fill: var(--muted); }
.flow .f-dsub { font-size: 13px; fill: var(--muted); }
.flow .f-tag { font-size: 12px; fill: #94979e; letter-spacing: .03em; }
.flow .f-label { font-size: 13px; fill: var(--muted); }
.flow .f-num { font-size: 12px; font-weight: 700; fill: #fff; }
.flow .f-red-t { fill: #b23a33; }
.flow .f-green-t { fill: #0c5d44; }
.flow .f-accent-t { font-size: 14px; font-weight: 600; fill: var(--accent); }
.flow .f-img-frame { fill: none; stroke: #cbc7bd; stroke-width: 1.5; }

/* 连线 */
.flow .f-line { fill: none; stroke: #b3afa5; stroke-width: 2; }
.flow .f-line-b { stroke: var(--accent); stroke-width: 2.2; }

/* 编号点 */
.flow .f-dot { fill: var(--accent); }

/* hover 高亮 */
.flow .f-node:hover .f-box {
  stroke: var(--accent);
  filter: drop-shadow(0 5px 12px rgba(36, 86, 214, .18));
}
.flow .f-node:hover .f-t { fill: var(--accent); }
.flow .f-node-red:hover .f-box {
  stroke: #c2413a;
  filter: drop-shadow(0 5px 12px rgba(194, 65, 58, .16));
}
.flow .f-node-red:hover .f-t { fill: #b23a33; }
.flow .f-node-green:hover .f-box {
  stroke: var(--green);
  filter: drop-shadow(0 5px 12px rgba(15, 122, 88, .16));
}
.flow .f-node-green:hover .f-t { fill: #0c5d44; }

/* 图例 */
.flow-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13.5px;
}
.flow-legend span { display: inline-flex; align-items: center; gap: 7px; }
.dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.dot-blue { background: var(--accent); }
.dot-red { background: #c2413a; }
.dot-green { background: var(--green); }

/* ---------- 真实例子页 ---------- */

.crumb { margin: 0 0 14px; font-size: 14px; }
.crumb a,
.back a { color: var(--muted); text-decoration: none; }
.crumb a:hover,
.back a:hover { color: var(--accent); text-decoration: underline; }

.lead { max-width: 62ch; margin: 0 0 24px; color: #3b3d44; }
.lead code {
  font-size: 14px;
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: #1f45a8;
}

h2 {
  margin: clamp(28px, 3.2vw, 38px) 0 12px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.shot {
  margin: 0;
  padding: clamp(8px, 1.4vw, 14px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.shot img { display: block; width: 100%; height: auto; border-radius: 8px; }
.shot figcaption { margin-top: 10px; font-size: 13.5px; color: var(--muted); }

/* 表格 */
.tbl-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow-x: auto;
}
.tbl { width: 100%; border-collapse: collapse; font-size: 15px; }
.tbl th {
  padding: 11px 16px;
  text-align: left;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--muted);
  background: #f7f5f0;
  white-space: nowrap;
}
.tbl td {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  vertical-align: top;
}
.tbl td.num { font-variant-numeric: tabular-nums; white-space: nowrap; color: #3b3d44; }
.tbl td.guess { color: #a6a8ae; }
.tbl .pid {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.tbl .pid i { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.tbl .yes { color: var(--green); font-weight: 600; white-space: nowrap; }
.tbl .no { color: #b23a33; font-weight: 600; white-space: nowrap; }
.tbl code {
  display: block;
  margin-top: 3px;
  font-size: 11.5px;
  color: #a6a8ae;
  word-break: break-word;
}

.tbl-note { margin: 10px 2px 0; font-size: 13.5px; color: var(--muted); }

.takeaway {
  margin: 22px 0 0;
  padding: 14px 18px;
  background: var(--green-soft);
  border-left: 3px solid var(--green);
  border-radius: 0 10px 10px 0;
  font-weight: 600;
  color: #12503c;
}

.aside {
  margin-top: 22px;
  padding: 15px 18px;
  background: var(--panel);
  border: 1px dashed var(--line);
  border-radius: 12px;
  color: var(--muted);
  font-size: 14.5px;
}
.aside strong { color: #3b3d44; }

.back { margin: 26px 0 0; font-size: 14px; }

/* 首页流程图下面的入口，故意做得不显眼 */
.example-link { margin: 14px 2px 0; text-align: right; font-size: 14px; }
.example-link a { color: #8b8e95; text-decoration: none; }
.example-link a:hover { color: var(--accent); text-decoration: underline; }

/* 流程图下面的真实例子，和流程图连成一页 */
.example {
  margin-top: clamp(36px, 5vw, 56px);
  padding-top: clamp(26px, 4vw, 38px);
  border-top: 1px solid var(--line);
}
.example h2 { margin-top: 0; }
.example h3 {
  margin: clamp(26px, 3vw, 34px) 0 12px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.ref {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin: 0 1px;
  padding: 1px 9px 1px 3px;
  background: var(--accent-soft);
  border: 1px solid #d9e3ff;
  border-radius: 999px;
  color: #1f45a8;
  font-size: 13px;
  white-space: nowrap;
}
.ref b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  line-height: 1;
}
.ref.out { background: var(--green-soft); border-color: #cde8db; color: #0c5d44; }
.ref.out b { background: var(--green); }

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .flow-wide { display: none; }
  .flow-narrow { display: block; }
  .flow .f-t { font-size: 19px; }
  .flow .f-s { font-size: 13.5px; }
  .flow .f-dsub { font-size: 12.5px; }
  .flow-legend { font-size: 12.5px; gap: 6px 16px; }
}

@media (max-width: 640px) {
  body { font-size: 16px; padding: 16px; }
  .flow { padding: 10px; }
  .tbl { font-size: 13.5px; min-width: 560px; }
  .tbl th, .tbl td { padding: 9px 11px; }
  .tbl code { font-size: 11px; }
  .example-link { text-align: left; }
}