:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #192134;
  --ink: #f8fafc;
  --muted: #a6b5ca;
  --line: #34435c;
  --control-border: #71829d;
  --blue: #60a5fa;
  --blue-fill: #3b82f6;
  --on-blue: #0f172a;
  --selected: #1e40af;
  --blue-hover: #93c5fd;
  --blue-soft: #152b49;
  --warning: #fca5a5;
  --warning-bg: #2b202f;
  --warning-border: #9b555f;
  --warning-ink: #fee2e2;
  --low: #fbbf24;
  --high: #34d399;
  --error: #fca5a5;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --radius-control: 8px;
  --radius-section: 16px;
  --motion-feedback: 140ms;
  font-family: "IBM Plex Sans", "Microsoft YaHei", "PingFang SC", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 16px; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button, a, input, textarea, summary { touch-action: manipulation; }
button, summary, a { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
button:disabled { cursor: default; opacity: .48; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--blue); outline-offset: 4px;
}
.topbar, main, footer { width: min(100%, 1328px); margin-inline: auto; padding-inline: var(--space-12); }
/* 顶部导航：滚动时吸顶固定（全幅背景 + 内部内容对齐主容器宽度） */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100%;
  max-width: none;
  margin-inline: 0;
  padding-inline: max(var(--space-12), calc((100vw - 1328px) / 2 + var(--space-12)));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--motion-feedback), background var(--motion-feedback);
}
/* 未滚动到页面顶部时显示分隔线 */
.topbar.is-stuck { border-bottom-color: var(--line); }
.topbar { min-height: 80px; display: flex; justify-content: space-between; align-items: center; gap: var(--space-6); }
.brand { display: flex; align-items: center; gap: var(--space-3); font-weight: 700; font-size: 20px; }
.logo { display: grid; place-items: center; width: 40px; height: 40px; color: var(--on-blue); background: var(--blue-fill); border-radius: 12px; font-size: 23px; }
.domain { color: var(--muted); font-size: 12px; font-weight: 400; margin-left: var(--space-2); }
nav { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
nav a { min-height: 44px; display: inline-flex; align-items: center; padding: 8px 12px; border-radius: var(--radius-control); font-size: 14px; }
nav a:hover { color: var(--blue); background: var(--blue-soft); }
.skip-link { position: fixed; z-index: 10; top: 12px; left: 16px; padding: 12px 20px; background: var(--ink); color: var(--surface); border-radius: var(--radius-control); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.hero { position: relative; padding: 28px 32px 0; background: var(--warning-bg); color: var(--warning-ink); border: 1px solid var(--warning-border); border-left: 4px solid var(--warning); border-radius: var(--radius-section); }
.eyebrow { display: flex; align-items: center; gap: var(--space-2); color: var(--warning); font-size: 13px; font-weight: 600; }
.icon { display: block; width: 24px; height: 24px; flex-shrink: 0; }
h1 { font-size: clamp(30px, 3.6vw, 44px); font-weight: 800; line-height: 1.3; letter-spacing: -.035em; margin: 12px 0; overflow-wrap: anywhere; }
h1 span { display: inline-block; font-size: clamp(25px, 2.8vw, 34px); color: inherit; line-height: 1.45; letter-spacing: -.02em; }
.hero-copy { font-size: 14px; max-width: 70ch; margin: 0; line-height: 1.85; color: var(--warning-ink); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-6); margin: 20px 0 24px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: var(--space-3); padding: 11px 20px; border: 1px solid transparent; border-radius: var(--radius-control); font-size: 14px; font-weight: 600; transition: background var(--motion-feedback), box-shadow var(--motion-feedback); }
.primary { color: var(--on-blue); background: var(--blue-fill); border-color: var(--blue-fill); }
.primary:hover { background: var(--blue-hover); }
.hero-button { background: transparent; color: var(--warning-ink); border-color: var(--warning-border); }
.hero-button:hover { background: #412735; border-color: var(--warning); }
.hero-button:focus-visible { outline-color: var(--warning-ink); }
.subtle { color: var(--blue); border-color: var(--control-border); background: var(--surface); }
.subtle:hover { background: var(--blue-soft); }
.button:active:not(:disabled) { box-shadow: inset 0 0 0 2px currentColor; }
.text-link { display: inline-flex; align-items: center; min-height: 44px; text-decoration: underline; text-underline-offset: 5px; font-size: 14px; }
.hero-bottom { display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; padding: 16px 0 20px; border-top: 1px solid var(--warning-border); font-size: 12px; }
.tools { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 16px; margin: 24px 0 40px; }
.tool-card { display: flex; gap: var(--space-4); align-items: center; padding: var(--space-6); min-width: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; transition: background var(--motion-feedback), border-color var(--motion-feedback); }
.tool-card:hover { background: var(--blue-soft); border-color: var(--blue); }
.tool-card[href="#calculator"] { border-color: var(--blue); }

.tool-card > div:not(.tool-icon) { min-width: 0; }
.tool-card h2 { margin: 4px 0; font-size: 17px; font-weight: 700; }
.tool-card p { margin: 0; font-size: 12px; color: var(--muted); }
.tool-icon { display: grid; place-items: center; width: 40px; height: 40px; background: var(--blue-soft); border-radius: 10px; color: var(--blue); flex-shrink: 0; }
.tag { font-size: 12px; color: var(--muted); }
.arrow { margin-left: auto; width: 20px; height: 20px; color: var(--muted); }
.section-heading { display: flex; justify-content: space-between; align-items: center; gap: var(--space-6); margin-bottom: var(--space-4); }
.section-heading h2, .discipline h2 { margin: 0 0 10px; font-size: 30px; letter-spacing: -.025em; line-height: 1.4; }
.section-heading p, .discipline p { color: var(--muted); margin: 0; font-size: 14px; max-width: 65ch; }
.section-heading .button { flex-shrink: 0; }
.model-banner { font-size: 13px; color: var(--muted); padding-left: 14px; border-left: 3px solid var(--control-border); margin: 0 0 28px; }
.calculator-layout { display: grid; grid-template-columns: 344px minmax(0,1fr); gap: var(--space-6); align-items: start; }
.panel { padding: var(--space-6); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; min-width: 0; }
.inputs { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-section); }
.panel-title { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 12px; margin-bottom: 20px; }
.panel-title h3 { margin: 0; font-size: 16px; font-weight: 700; line-height: 1.5; }
.panel-title > span { color: var(--muted); font-size: 12px; }
label { display: block; font-size: 14px; margin: 18px 0; }
label > span { display: block; font-size: 12px; color: var(--muted); margin-top: 4px; }
input:not([type=range]), textarea { display: block; width: 100%; min-height: 46px; margin-top: 8px; padding: 10px 12px; border: 1px solid var(--control-border); background: var(--bg); color: var(--ink); border-radius: var(--radius-control); font-size: 16px; font-variant-numeric: tabular-nums; }
input:focus, textarea:focus { border-color: var(--blue); }
textarea { resize: vertical; line-height: 1.7; }
.input-wrap { position: relative; }
.input-wrap b { position: absolute; top: 14px; left: 14px; color: var(--muted); font-size: 22px; }
.input-wrap input { font-size: 28px; padding-left: 38px; font-weight: 700; }
.field-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 16px; }
.field-grid label { min-width: 0; font-size: 13px; }
.range-label { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 8px; }
.range-label strong { color: var(--blue); font-size: 14px; font-weight: 600; }
input[type=range] { display: block; width: 100%; height: 44px; margin: 12px 0; accent-color: var(--blue); }
.range-label input { grid-column: 1 / -1; margin-bottom: 0; }
.hint { font-size: 12px; line-height: 1.8; color: var(--muted); margin: 12px 0 0; max-width: 80ch; }
.divider { height: 1px; background: var(--line); margin: 24px 0; }
.scenario-inputs { display: grid; grid-template-columns: .8fr 1fr 1fr; align-items: center; gap: 12px; }
.scenario-inputs > span { font-size: 12px; color: var(--muted); }
.scenario-inputs b { font-size: 13px; font-weight: 500; }
.scenario-inputs input { margin: 0; min-width: 0; }
details { margin-top: 24px; }
summary { min-height: 44px; padding: 10px 0; font-size: 14px; font-weight: 600; }
summary > span { font-size: 12px; color: var(--muted); font-weight: 400; margin-left: 8px; }
details[open] summary { margin-bottom: 8px; }
.assumptions { margin-top: 0; }
.calculate { width: 100%; margin-top: 24px; }
.error { color: var(--error); font-size: 13px; margin: 10px 0 0; }
.results { display: grid; gap: var(--space-6); min-width: 0; }
.result-top { background: var(--surface); border: 1px solid var(--line); padding: 24px; }
.summary { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: var(--space-3); }
.summary article { min-width: 0; padding: 18px 16px; background: var(--bg); border-radius: 10px; }
.summary article:nth-child(2) { background: var(--selected); color: var(--ink); border: 1px solid var(--blue); }
.summary .scenario-name { font-size: 13px; color: var(--muted); }
.summary article:nth-child(2) .scenario-name, .summary article:nth-child(2) small { color: var(--ink); }
.summary strong { display: block; font-size: clamp(18px,1.9vw,25px); line-height: 1.5; margin: 10px 0 12px; font-weight: 700; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.summary small { font-size: 12px; color: var(--muted); line-height: 1.8; }
.notice { border-left: 3px solid var(--control-border); color: var(--muted); font-size: 12px; padding: 0 0 0 14px; margin-top: 20px; line-height: 1.85; }
.chart-panel { border: 1px solid var(--line); border-radius: 12px; }
.chart svg { width: 100%; height: auto; display: block; }
.chart { min-height: 180px; }
.legend { display: flex; flex-wrap: wrap; gap: 12px 20px; color: var(--muted); font-size: 12px; margin-top: 16px; }
.legend > span { display: flex; align-items: center; gap: 8px; }
.low { color: var(--low); }.base { color: var(--blue); }.high { color: var(--high); }
.line-swatch { width: 22px; display: inline-block; border-top: 3px solid currentColor; }
.line-swatch.dashed { border-top-style: dashed; }.line-swatch.dotted { border-top-style: dotted; }
.line-swatch.target { border-top: 2px dashed var(--muted); }
.chart-inspector { border-top: 1px solid var(--line); margin-top: 20px; padding-top: 12px; }
.chart-inspector label { margin: 0; font-size: 13px; }
#inspect-year-label { color: var(--blue); font-weight: 700; padding-inline: 4px; }
.inspect-values { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 13px; font-variant-numeric: tabular-nums; min-height: 24px; }
.inspect-values b { font-weight: 600; }.inspect-values span { white-space: normal; }
.annual-details { margin-top: 12px; }
.table-scroll { overflow-x: auto; border-radius: 4px; max-width: 100%; }
table { border-collapse: collapse; width: 100%; font-size: 13px; text-align: left; font-variant-numeric: tabular-nums; }
th { color: var(--muted); font-size: 12px; font-weight: 500; }
td, th { padding: 12px 10px; border-bottom: 1px solid var(--line); }
td:first-child, th:first-child { padding-left: 0; }
td:last-child, th:last-child { text-align: right; padding-right: 0; }
td em { color: var(--blue); font-size: 12px; font-style: normal; display: block; }
.annual-details table { min-width: 580px; }
.extras-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: var(--space-6); margin-top: 28px; }
.target-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.target-row label { margin: 0; font-size: 14px; }
.target-row input { width: 72px; display: inline-block; padding: 8px; margin: 0 6px; }
#target-result { color: var(--blue); font-size: 21px; line-height: 1.6; margin: 16px 0 0; font-weight: 600; }
.budget-list { display: grid; gap: 12px; }
.budget-item { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 4px 16px; font-size: 14px; }
.budget-item strong { font-weight: 600; color: var(--blue); }
.model-details { margin-top: 24px; background: transparent; border: 0; padding: 0; }
.model-details p { color: var(--muted); font-size: 13px; max-width: 80ch; }
.model-details a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.discipline { display: grid; grid-template-columns: minmax(0,.9fr) minmax(0,1.1fr); gap: 48px; margin: 48px 0 32px; padding: 32px; border: 1px solid var(--line); border-radius: var(--radius-section); }
.discipline-rules { display: grid; gap: 10px; list-style: none; padding: 0; margin: 28px 0 0; font-size: 14px; }
.discipline-rules li { display: flex; align-items: center; gap: 10px; }
.discipline-rules li::before { content: ""; width: 9px; height: 9px; border: 2px solid var(--blue); border-radius: 2px; }
.discipline form label:first-child { margin-top: 0; }
.memo-actions { display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: center; }
.text-button { min-height: 44px; padding: 8px 0; color: var(--muted); background: transparent; border: 0; font-size: 13px; text-decoration: underline; text-underline-offset: 4px; }
#saved { color: var(--high); font-size: 12px; }
footer { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 24px; padding-block: 24px 36px; font-size: 12px; color: var(--muted); }
footer .brand { font-size: 15px; color: var(--ink); }
footer a { display: inline-flex; min-height: 44px; align-items: center; }
/* ICP 备案号：需按法规展示并链接工信部备案系统 */
footer .icp { color: var(--muted); text-decoration: none; font-variant-numeric: tabular-nums; }
footer .icp:hover { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
@media (max-width: 1100px) {
  main, footer { padding-inline: 32px; }
  .topbar { padding-inline: 32px; }
  .domain { display: none; }
  .calculator-layout { grid-template-columns: 300px minmax(0,1fr); gap: 20px; }
  .tools { margin-bottom: 44px; }
  .tool-card { padding: 20px 16px; gap: 12px; }
  .tool-card .arrow { display: none; }
  .tool-card h2 { font-size: 15px; }
  .summary article { padding: 16px 12px; }
  .summary { gap: 8px; }
  .panel { padding: 20px; }
  .result-top { padding: 20px; }
}
@media (max-width: 900px) {
  .calculator-layout { grid-template-columns: 1fr; }
  .inputs { display: block; }
  .summary strong { font-size: 28px; }
  .hero { padding-inline: 32px; }
  .tools { grid-template-columns: 1fr; }
  
  .tool-card .arrow { display: block; }
  .tool-card h2 { font-size: 17px; }
  .extras-grid { grid-template-columns: 1fr; }
  .discipline { gap: 32px; }
}
@media (max-width: 640px) {
  main, footer { padding-inline: 16px; }
  .topbar { padding-inline: 16px; }
  .topbar { flex-wrap: wrap; padding-top: 20px; padding-bottom: 16px; gap: 8px; }
  .brand { font-size: 18px; }
  nav { width: 100%; justify-content: space-between; }
  nav a { font-size: 13px; padding-inline: 8px; }
  .hero { padding: 24px 20px 0; border-radius: 12px; }
  h1 { font-size: 32px; margin-block: 16px; }
  h1 span { font-size: 27px; line-height: 1.5; }
  .hero-copy { font-size: 14px; }
  .hero-copy br { display: none; }
  .hero-actions { gap: 12px 20px; margin: 24px 0; }
  .hero-bottom { font-size: 12px; gap: 6px; }
  .hero-bottom span:last-child { display: none; }
  .tools { margin: 16px 0 36px; }
  .section-heading { align-items: flex-start; flex-wrap: wrap; gap: 16px; }
  .section-heading h2, .discipline h2 { font-size: 25px; }
  .section-heading .button { min-height: 44px; }
  .model-banner { font-size: 12px; }
  .summary { grid-template-columns: 1fr; gap: 10px; }
  .summary article { display: grid; grid-template-columns: 1fr 1.2fr; padding: 16px; gap: 4px 12px; align-items: center; }
  .summary strong { font-size: 24px; margin: 0; text-align: right; grid-column: 2; grid-row: 1 / 3; }
  .summary small { grid-column: 1; }
  .summary .scenario-name { grid-column: 1; font-weight: 600; }
  .panel-title { margin-bottom: 16px; }
  .chart-panel { padding: 20px 12px; }
  .chart { min-height: 0; }
  .legend { gap: 8px 16px; }
  .chart-inspector { padding-inline: 8px; }
  .inspect-values { display: grid; gap: 8px; }
  .discipline { grid-template-columns: 1fr; margin-block: 40px 20px; padding: 24px 20px; }
  footer { flex-wrap: wrap; gap: 8px 20px; }
  footer span { width: 100%; order: 3; }
}
@media (max-width: 360px) {
  .field-grid { grid-template-columns: 1fr; }
  .summary article { grid-template-columns: 1fr; }
  .summary strong { grid-column: 1; grid-row: auto; text-align: left; }
  .summary small { grid-row: auto; }
  .hero { padding-inline: 20px; }
  h1 { font-size: 29px; } h1 span { font-size: 25px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* Form feedback is kept next to its control. */
.field-error { display: block; margin-top: 6px; color: var(--error); font-size: 12px; line-height: 1.6; }
.field-error:empty { display: none; }
input[aria-invalid="true"] { border-color: var(--error); }
.results[data-stale="true"] > .panel { border-style: dashed; }
.results[data-stale="true"] .summary { outline: 1px dashed var(--control-border); outline-offset: 4px; }
.result-status { color: var(--muted); font-size: 12px; margin: 0 0 16px; min-height: 20px; }
.model-details summary { border-radius: 8px; }
.table-scroll tbody tr:hover { background: var(--blue-soft); }
@media (max-width: 900px) { .tools { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; } .tool-card { flex-wrap: wrap; } .tool-card .arrow { display: none; } }
@media (max-width: 640px) { .tools { grid-template-columns: 1fr; } .tool-card { flex-wrap: nowrap; padding: 16px; } .tool-card .arrow { display: block; } }