/* ==========================================================================
   FIRE Calculator — shared stylesheet (zh / en)
   Typography is driven by CSS variables so the two language pages can use
   different type stacks without duplicating a single rule below.
   ========================================================================== */

:root {
  color-scheme: light dark;

  --bg: #eef2ef;
  --surface: #ffffff;
  --surface-2: #e4ebe7;
  --ink: #14201a;
  --muted: #5d6b63;
  --line: #cad5ce;
  --accent: #087f5b;
  --accent-strong: #056747;
  --accent-soft: #d9f2e8;
  --warning: #b84b2c;
  --warning-soft: #fbe6df;
  --sun: #f0b43c;
  --shadow: 0 18px 50px rgba(24, 48, 36, .09);
  --chart-grid: #d7e0da;

  /* Type stacks — overridden per locale on <html data-locale="..."> */
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-display: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

html[data-locale="en"] {
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1612;
    --surface: #18211c;
    --surface-2: #222f28;
    --ink: #eef6f1;
    --muted: #a9b9af;
    --line: #35463d;
    --accent: #53d5a4;
    --accent-strong: #7ce6bd;
    --accent-soft: #173f32;
    --warning: #ff9b7b;
    --warning-soft: #47261f;
    --sun: #f3c96b;
    --shadow: 0 20px 54px rgba(0, 0, 0, .28);
    --chart-grid: #2b3a32;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--line) 34%, transparent) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(color-mix(in srgb, var(--line) 34%, transparent) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  min-width: 0;
}
html[data-locale="en"] body { line-height: 1.6; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 60;
  background: var(--ink); color: var(--surface); padding: 10px 14px; font-size: 13px;
}
.skip-link:focus { left: 8px; top: 8px; }

.shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 20px 0 64px; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 6px 4px 16px;
}
.brand { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; font-weight: 700; font-size: 14px; }
.brand img { width: 24px; height: 24px; display: block; }
.brand small { color: var(--muted); font-weight: 500; font-size: 12px; }
.lang-switch { display: inline-flex; border: 1px solid var(--line); background: var(--surface); }
.lang-switch a, .lang-switch span {
  padding: 6px 12px; font-size: 12px; font-weight: 700; text-decoration: none;
  color: var(--muted); border-left: 1px solid var(--line);
}
.lang-switch a:first-child, .lang-switch span:first-child { border-left: 0; }
.lang-switch .on { background: var(--ink); color: var(--surface); }

/* ---------- intro ---------- */
.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(270px, .55fr);
  gap: 28px;
  align-items: end;
  padding: 18px 4px 34px;
}
.intro h1 {
  max-width: 780px; margin: 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 6.2vw, 76px);
  line-height: 1.06; letter-spacing: -.045em;
}
html[data-locale="en"] .intro h1 { font-size: clamp(36px, 5.6vw, 68px); letter-spacing: -.03em; }
.intro h1 em { color: var(--accent); font-style: normal; }
.intro p { margin: 18px 0 0; color: var(--muted); max-width: 700px; font-size: 17px; }
.method-note { border-top: 3px solid var(--ink); padding-top: 14px; color: var(--muted); font-size: 13px; }
.method-note strong { display: block; color: var(--ink); margin-bottom: 4px; font-size: 14px; }

/* ---------- workspace ---------- */
.workspace { display: grid; grid-template-columns: minmax(340px, .88fr) minmax(0, 1.12fr); gap: 18px; align-items: start; }
.panel { background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.inputs { padding: 24px; position: sticky; top: 16px; }
.panel-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.panel-head h2, .section-head h2 { margin: 0; font-family: var(--font-display); font-size: 23px; letter-spacing: -.02em; }
.panel-head span { color: var(--muted); font-size: 12px; }

.presets { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-bottom: 22px; }
.preset {
  appearance: none; border: 1px solid var(--line); background: var(--surface-2);
  color: var(--muted); padding: 9px 8px; cursor: pointer; font-size: 12px; font-weight: 700;
}
.preset[aria-pressed="true"] { background: var(--ink); color: var(--surface); border-color: var(--ink); }

.field-group { border-top: 1px solid var(--line); padding: 17px 0 2px; }
.field-group:first-of-type { border-top: 0; padding-top: 0; }
.group-title { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 11px; }
.group-title h3 { margin: 0; font-size: 14px; }
.group-title small { color: var(--muted); font-size: 11px; text-align: right; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
label.field { display: block; min-width: 0; }
.field > span { display: block; margin-bottom: 6px; color: var(--muted); font-size: 12px; }
.money, .number { display: flex; align-items: center; background: var(--surface-2); border: 1px solid transparent; transition: border .2s; }
.money:focus-within, .number:focus-within { border-color: var(--accent); }
.money b, .number b { padding-left: 10px; color: var(--muted); font-size: 12px; font-family: var(--font-mono); }
input[type="number"] {
  width: 100%; min-width: 0; border: 0; outline: 0; color: var(--ink);
  background: transparent; padding: 10px 9px; font-family: var(--font-mono); font-size: 14px;
}
.range-row { margin-top: 10px; }
.range-label { display: flex; justify-content: space-between; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; margin-bottom: 5px; }
.range-label output { color: var(--ink); font-family: var(--font-mono); font-weight: 600; }
input[type="range"] { width: 100%; accent-color: var(--accent); }

/* ---------- results ---------- */
.results { display: grid; gap: 18px; }
.hero-result { position: relative; overflow: hidden; padding: 28px; background: var(--ink); color: var(--surface); min-height: 292px; }
@media (prefers-color-scheme: dark) { .hero-result { background: #dff4e8; color: #102018; } }
.hero-result::after { content: ""; position: absolute; right: -65px; top: -85px; width: 230px; height: 230px; border: 38px solid var(--accent); border-radius: 50%; opacity: .72; }
.result-kicker { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; opacity: .7; }
.big-number { position: relative; z-index: 1; margin: 9px 0 8px; font-family: var(--font-mono); font-size: clamp(42px, 6vw, 70px); line-height: 1; letter-spacing: -.06em; }
.result-sub { max-width: 570px; opacity: .75; font-size: 13px; }
.result-grid { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 26px; }
.metric { border-top: 1px solid currentColor; padding-top: 10px; }
.metric strong { display: block; font-family: var(--font-mono); font-size: 20px; }
.metric span { display: block; margin-top: 3px; font-size: 11px; opacity: .68; }

.route { padding: 22px; }
.section-head { display: flex; justify-content: space-between; gap: 18px; align-items: start; margin-bottom: 18px; }
.section-head p { margin: 3px 0 0; color: var(--muted); font-size: 12px; max-width: 430px; text-align: right; }
.progress-track { height: 14px; background: var(--surface-2); overflow: hidden; border: 1px solid var(--line); }
.progress-fill { height: 100%; width: 0; background: var(--accent); transition: width .35s ease; }
.progress-labels { display: flex; justify-content: space-between; gap: 8px; margin-top: 7px; font: 11px var(--font-mono); color: var(--muted); }
.milestones { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 20px; }
.milestone { background: var(--surface-2); padding: 12px; min-height: 82px; border-bottom: 3px solid transparent; }
.milestone.reached { border-color: var(--accent); }
.milestone b { display: block; font: 600 14px var(--font-mono); }
.milestone span { display: block; color: var(--muted); font-size: 11px; margin-top: 8px; }

/* ---------- stress test ---------- */
.stress { padding: 22px; }
.stress-controls { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: center; margin-bottom: 12px; }
.stress-state { text-align: right; }
.stress-state strong { display: block; font: 600 19px var(--font-mono); color: var(--warning); }
.stress-state span { color: var(--muted); font-size: 11px; }
.chart-wrap { min-height: 210px; position: relative; }
#stressChart { width: 100%; height: 215px; display: block; overflow: visible; }
.chart-axis { stroke: var(--chart-grid); stroke-width: 1; }
.chart-area { fill: var(--accent-soft); opacity: .7; }
.chart-line { fill: none; stroke: var(--accent); stroke-width: 3; vector-effect: non-scaling-stroke; }
.chart-danger { stroke: var(--warning); stroke-width: 1.5; stroke-dasharray: 4 5; }
.chart-text { fill: var(--muted); font: 10px var(--font-mono); }
.chart-dot { fill: var(--warning); stroke: var(--surface); stroke-width: 2; }
.stress-note { margin: 6px 0 0; color: var(--muted); font-size: 12px; }

/* ---------- asset accumulation curve ---------- */
.growth { padding: 22px; }
.growth-summary { margin: -4px 0 8px; text-align: right; }
.growth-summary strong { display: block; font: 600 19px var(--font-mono); color: var(--accent-strong); }
.growth-summary span { color: var(--muted); font-size: 11px; }
.growth-note { margin: 6px 0 0; color: var(--muted); font-size: 12px; }
.chart-target { stroke: var(--accent-strong); stroke-width: 1.5; stroke-dasharray: 5 4; opacity: .8; }
.chart-target-text { fill: var(--accent-strong); font: 10px var(--font-mono); }
.growth-dot { fill: var(--accent-strong); }

/* ---------- market reference ---------- */
.market { margin-top: 18px; display: grid; grid-template-columns: 1.05fr .95fr; }
.market-lead { background: var(--accent); color: #fff; padding: 26px; }
.market-lead h2 { margin: 0; font-family: var(--font-display); font-size: 27px; }
.index-snapshots { display: grid; grid-template-columns: 1fr 1fr; margin-top: 24px; border-top: 1px solid rgba(255,255,255,.38); border-bottom: 1px solid rgba(255,255,255,.38); }
.index-snapshot { min-width: 0; padding: 16px 18px 17px 0; }
.index-snapshot + .index-snapshot { border-left: 1px solid rgba(255,255,255,.38); padding-left: 18px; padding-right: 0; }
.index-name { font: 600 12px var(--font-mono); letter-spacing: .04em; opacity: .78; }
.market-lead .snapshot { margin-top: 8px; display: block; }
.market-lead .snapshot strong { display: block; font: 600 clamp(30px, 3.8vw, 47px) var(--font-mono); line-height: 1; letter-spacing: -.035em; }
.market-lead .snapshot span { display: block; margin-top: 8px; font-size: 11px; opacity: .8; }
.market-lead p { margin: 16px 0 0; max-width: 530px; font-size: 12px; opacity: .84; }
.market-lead .source-link { color: #fff; opacity: .92; }
.market-facts { background: var(--surface); border: 1px solid var(--line); border-left: 0; padding: 20px 24px; }
.fact { display: grid; grid-template-columns: 112px 1fr; gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.fact:last-child { border-bottom: 0; }
.fact b { font: 600 16px var(--font-mono); }
.fact span { color: var(--muted); font-size: 12px; }
.source-link { display: inline-block; margin-top: 13px; font-weight: 700; font-size: 12px; color: var(--accent-strong); text-underline-offset: 3px; }

/* ---------- learn / FAQ ---------- */
.learn { margin-top: 18px; background: var(--surface); border: 1px solid var(--line); padding: 26px; }
.learn-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 34px; }
.learn h2 { margin: 0; font-family: var(--font-display); font-size: 27px; }
.learn-intro p { color: var(--muted); font-size: 13px; }
.signal-list { display: grid; gap: 9px; margin-top: 18px; }
.signal { display: grid; grid-template-columns: 26px 1fr; gap: 10px; align-items: start; font-size: 12px; }
.signal i { width: 22px; height: 22px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-strong); font-style: normal; font: 600 11px var(--font-mono); }
details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; padding: 15px 30px 15px 0; font-weight: 700; position: relative; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 4px; font: 600 20px var(--font-mono); }
details[open] summary::after { content: "\2212"; }
details p { margin: -3px 28px 16px 0; color: var(--muted); font-size: 13px; }
details a { color: var(--accent-strong); }

/* ---------- footer ---------- */
.footer-note { display: grid; grid-template-columns: 1fr auto; gap: 24px; margin-top: 20px; padding: 18px 4px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.footer-actions { display: flex; align-items: center; gap: 16px; justify-content: flex-end; flex-wrap: wrap; }
.copy-btn { border: 0; background: transparent; color: var(--accent-strong); font-weight: 700; cursor: pointer; padding: 0; text-decoration: underline; text-underline-offset: 3px; }
.footer-note a { color: var(--accent-strong); }
.footer-note-main { display: flex; flex-direction: column; gap: 4px; }
.toast { position: fixed; right: 18px; bottom: 18px; background: var(--ink); color: var(--surface); padding: 11px 15px; font-size: 12px; opacity: 0; transform: translateY(12px); pointer-events: none; transition: .25s; box-shadow: var(--shadow); z-index: 50; }
.toast.show { opacity: 1; transform: translateY(0); }

/* ---------- responsive ---------- */
@media (max-width: 840px) {
  .shell { width: min(100% - 20px, 720px); padding-top: 8px; }
  .intro { grid-template-columns: 1fr; gap: 20px; padding: 12px 2px 26px; }
  .intro h1 { font-size: clamp(38px, 12vw, 60px); }
  .workspace { grid-template-columns: 1fr; }
  .inputs { position: static; }
  .market, .learn-grid { grid-template-columns: 1fr; }
  .market-facts { border-left: 1px solid var(--line); border-top: 0; }
}
@media (max-width: 560px) {
  .shell { width: calc(100% - 16px); padding-bottom: 34px; }
  .topbar { flex-wrap: wrap; }
  .brand small { display: none; }
  .intro { padding-left: 6px; padding-right: 6px; }
  .intro h1 { font-size: 42px; }
  .intro p { font-size: 14px; }
  .panel, .learn { box-shadow: none; }
   .inputs, .route, .stress, .growth, .learn { padding: 18px; }
  .presets { grid-template-columns: 1fr 1fr; }
  .fields { grid-template-columns: 1fr; gap: 9px; }
  .result-grid { grid-template-columns: 1fr; gap: 7px; }
  .metric { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
  .metric strong { font-size: 17px; }
  .hero-result { padding: 22px 19px; min-height: auto; }
  .big-number { font-size: 45px; }
  .milestones { grid-template-columns: 1fr 1fr; }
  .section-head { display: block; }
  .section-head p { text-align: left; margin-top: 5px; }
  .stress-controls { grid-template-columns: 1fr; gap: 8px; }
  .stress-state { text-align: left; }
  .market-lead { padding: 22px 18px; }
  .index-snapshots { grid-template-columns: 1fr; }
  .index-snapshot { padding-right: 0; }
  .index-snapshot + .index-snapshot { border-left: 0; border-top: 1px solid rgba(255,255,255,.38); padding-left: 0; }
  .market-lead .snapshot { display: block; }
  .market-lead .snapshot span { display: block; margin-top: 6px; }
  .fact { grid-template-columns: 92px 1fr; }
  .footer-note { grid-template-columns: 1fr; gap: 10px; }
  .footer-actions { justify-content: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}
@media print {
  .topbar, .inputs, .copy-btn, .lang-switch { display: none; }
  body { background: #fff; }
  .panel, .learn { box-shadow: none; }
}
/* growth chart: 30-year projection */
#growthChart { width: 100%; height: 270px; display: block; overflow: visible; }
.chart-grid { stroke-dasharray: 2 4; }
.chart-hit { stroke: var(--accent-strong); stroke-width: 1; stroke-dasharray: 2 3; opacity: .7; }
.chart-hit-text { fill: var(--accent-strong); font: 600 11px var(--font-mono); paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; }
.chart-miss-text { fill: var(--warning); }
.chart-end-text { fill: var(--ink); font-weight: 600; paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; }
.growth-end { fill: var(--accent); }
#growthChart .chart-text, #growthChart .chart-target-text { font-size: 11px; }
#growthChart .chart-target-text { paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; }