/* ==========================================================================
   PayoutFee — 视觉方向：「可信赖的仪表」，不是 SaaS 落地页
   反 AI 味约束：无紫蓝渐变 / 无 emoji 图标 / 无对称三列卡片 / 无大圆角
   ========================================================================== */

:root {
  --paper: #fbfaf7;
  --card: #ffffff;
  --ink: #14161a;
  --ink-2: #4a5057;
  --ink-3: #7c838b;
  --rule: #e4e1d9;
  --rule-2: #cfcbc0;
  --accent: #0e5a4a;
  --accent-soft: #e8f0ed;
  --warn-bg: #fdf7e8;
  --warn-line: #e6d6a8;
  --warn-ink: #6b4f06;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 880px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.65 var(--sans);
  font-feature-settings: "tnum" 1;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--ink); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- masthead ---------- */
.masthead { border-bottom: 1px solid var(--rule); background: var(--paper); }
.masthead .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 56px; flex-wrap: wrap;
}
.brand {
  font-weight: 600; font-size: 15px; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 8px;
}
.brand .mark {
  width: 14px; height: 14px; border: 1.5px solid var(--accent);
  border-radius: 2px; position: relative; flex: 0 0 auto;
}
.brand .mark::after {
  content: ""; position: absolute; left: 3px; right: 3px; top: 4px;
  height: 1.5px; background: var(--accent);
}
.masthead nav { display: flex; gap: 18px; font-size: 14px; flex-wrap: wrap; }
.masthead nav a { color: var(--ink-2); text-decoration: none; padding: 4px 0; }
.masthead nav a:hover, .masthead nav a[aria-current] { color: var(--ink); border-bottom: 2px solid var(--accent); }

/* ---------- hero ---------- */
.hero { padding: 40px 0 8px; }
h1 { font-size: 34px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 10px; font-weight: 600; }
.sub { font-size: 17px; color: var(--ink-2); margin: 0 0 22px; max-width: 60ch; }
.verified {
  font-size: 13px; color: var(--ink-3); margin: 14px 0 0;
  font-family: var(--mono); display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
}
.verified .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; }

/* ---------- calculator ---------- */
.calc { background: var(--card); border: 1px solid var(--rule-2); border-radius: 4px; margin: 22px 0 0; }
.calc-head { border-bottom: 1px solid var(--rule); padding: 14px 18px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.tabs { display: flex; gap: 0; border: 1px solid var(--rule-2); border-radius: 3px; overflow: hidden; }
.tabs button {
  appearance: none; border: 0; background: transparent; cursor: pointer;
  font: 500 13px/1 var(--sans); color: var(--ink-2); padding: 10px 14px; min-height: 40px;
  border-right: 1px solid var(--rule-2);
}
.tabs button:last-child { border-right: 0; }
.tabs button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.tabs button:hover:not([aria-pressed="true"]) { background: var(--accent-soft); }

.calc-body { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.calc-in { padding: 20px 18px; border-right: 1px solid var(--rule); }
.calc-out { padding: 20px 18px; background: #fcfcfa; }

.field { margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }
label { display: block; font-size: 13px; font-weight: 500; color: var(--ink-2); margin-bottom: 6px; }
.hint { font-weight: 400; color: var(--ink-3); }
.input {
  display: flex; align-items: center; border: 1px solid var(--rule-2); border-radius: 3px;
  background: #fff; overflow: hidden; min-height: 46px;
}
.input .pre {
  padding: 0 10px; color: var(--ink-3); font-family: var(--mono); font-size: 15px;
  border-right: 1px solid var(--rule); align-self: stretch; display: flex; align-items: center;
}
.input input {
  flex: 1; border: 0; outline: 0; padding: 11px 12px; font: 500 16px/1 var(--mono);
  color: var(--ink); background: transparent; min-width: 0;
}
.input:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
select.input {
  width: 100%; padding: 12px; font: 400 15px/1 var(--sans); appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-3) 50%), linear-gradient(135deg, var(--ink-3) 50%, transparent 50%);
  background-position: calc(100% - 18px) 20px, calc(100% - 13px) 20px;
  background-size: 5px 5px, 5px 5px; background-repeat: no-repeat;
}

.toggle { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-2); margin-top: 8px; }
.toggle input { width: 16px; height: 16px; accent-color: var(--accent); }

.out-row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 9px 0; border-bottom: 1px dashed var(--rule); }
.out-row:last-of-type { border-bottom: 0; }
.out-row .k { font-size: 13px; color: var(--ink-2); }
.out-row .v { font-family: var(--mono); font-size: 15px; font-weight: 500; }
.out-hero { padding: 0 0 14px; border-bottom: 1px solid var(--rule-2); margin-bottom: 12px; }
.out-hero .k { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-3); }
.out-hero .v { font-family: var(--mono); font-size: 40px; font-weight: 600; letter-spacing: -0.02em; line-height: 1.1; margin-top: 2px; }
.out-hero .v.neg { color: #9a2a1f; }
.out-note { font-size: 12px; color: var(--ink-3); margin-top: 10px; }

.actions { margin-top: 14px; display: flex; gap: 8px; flex-wrap: wrap; }
.btn {
  appearance: none; border: 1px solid var(--rule-2); background: #fff; color: var(--ink);
  font: 500 13px/1 var(--sans); padding: 11px 14px; min-height: 42px; border-radius: 3px; cursor: pointer;
}
.btn:hover { background: var(--accent-soft); border-color: var(--accent); }
.btn.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); }

/* ---------- sections ---------- */
section { padding: 38px 0; border-top: 1px solid var(--rule); }
section:first-of-type { border-top: 0; }
h2 { font-size: 22px; letter-spacing: -0.01em; margin: 0 0 6px; font-weight: 600; }
h3 { font-size: 16px; margin: 22px 0 6px; font-weight: 600; }
.lede { color: var(--ink-2); margin: 0 0 18px; max-width: 68ch; }
p { margin: 0 0 12px; }

/* ---------- ledger table ---------- */
.ledger { width: 100%; border-collapse: collapse; font-size: 14px; }
.ledger th, .ledger td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.ledger th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-3); font-weight: 500; border-bottom: 1px solid var(--rule-2); }
.ledger td.num, .ledger th.num { text-align: right; font-family: var(--mono); white-space: nowrap; }
.ledger tr:last-child td { border-bottom: 0; }
.ledger .src { font-size: 12px; }
.ledger .src a { color: var(--ink-2); }

/* ---------- callout ---------- */
.callout { border: 1px solid var(--warn-line); background: var(--warn-bg); border-radius: 4px; padding: 16px 18px; }
.callout h3 { margin: 0 0 8px; color: var(--warn-ink); font-size: 15px; }
.callout p { font-size: 14px; color: var(--ink-2); }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0 4px; }
.variant { background: #fff; border: 1px solid var(--rule-2); border-radius: 3px; padding: 12px 14px; }
.variant .tag { font-size: 11px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--ink-3); }
.variant .fig { font-family: var(--mono); font-size: 19px; font-weight: 600; margin: 3px 0 4px; }
.variant .meta { font-size: 12px; color: var(--ink-2); }
.variant.ours { border-color: var(--accent); box-shadow: inset 3px 0 0 var(--accent); }

/* ---------- steps ---------- */
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; }
.steps li { counter-increment: s; position: relative; padding: 0 0 0 42px; margin-bottom: 16px; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 1px;
  width: 26px; height: 26px; border: 1px solid var(--rule-2); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font: 500 13px/1 var(--mono); color: var(--ink-2); background: #fff;
}
.steps strong { display: block; }

/* ---------- faq ---------- */
details { border-bottom: 1px solid var(--rule); }
details summary {
  cursor: pointer; padding: 14px 0; font-weight: 500; font-size: 15px; list-style: none;
  display: flex; justify-content: space-between; gap: 14px; align-items: center; min-height: 48px;
}
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; font-family: var(--mono); color: var(--ink-3); font-size: 18px; }
details[open] summary::after { content: "–"; }
details .ans { padding: 0 0 16px; color: var(--ink-2); font-size: 14.5px; max-width: 72ch; }

/* ---------- links grid ---------- */
.pages { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.pages a { display: block; padding: 14px 16px; background: var(--card); text-decoration: none; color: var(--ink); }
.pages a:hover { background: var(--accent-soft); }
.pages .t { font-weight: 500; font-size: 14.5px; }
.pages .d { font-size: 12.5px; color: var(--ink-3); margin-top: 2px; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--rule-2); margin-top: 40px; padding: 26px 0 44px; font-size: 13px; color: var(--ink-3); }
footer nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
footer nav a { color: var(--ink-2); }
.disclaim { max-width: 76ch; line-height: 1.6; }
.disclaim p { margin: 0 0 8px; }

/* ---------- prose (legal / data-sources pages) ---------- */
.prose { max-width: 76ch; }
.prose h2 { margin-top: 30px; }
.prose h2:first-child { margin-top: 0; }
.prose ul { padding-left: 20px; }
.prose li { margin-bottom: 6px; }
.prose code { font-family: var(--mono); font-size: 13.5px; background: var(--accent-soft); padding: 1px 5px; border-radius: 2px; }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  h1 { font-size: 27px; }
  .hero { padding: 26px 0 4px; }
  .calc-body { grid-template-columns: 1fr; }
  .calc-in { border-right: 0; border-bottom: 1px solid var(--rule); }
  .out-hero .v { font-size: 34px; }
  .compare { grid-template-columns: 1fr; }
  .masthead .wrap { min-height: 52px; }
  .masthead nav { gap: 14px; font-size: 13.5px; }
  section { padding: 30px 0; }
}

@media print {
  .calc, .pages, .masthead nav { display: none; }
}