:root {
  --page: #f4efe6;
  --surface: #fffdf8;
  --surface-muted: #ebe6dc;
  --surface-strong: #143b36;
  --ink: #17302d;
  --ink-soft: #64716d;
  --ink-inverse: #f9f5ec;
  --line: #d7d0c4;
  --accent: #1d655d;
  --accent-strong: #124b45;
  --accent-soft: #dceae5;
  --gold: #b88a39;
  --danger: #9a3c32;
  --font-body: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-display: "Noto Serif SC", "Songti SC", STSong, serif;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--page); scroll-behavior: smooth; }
body { min-width: 320px; min-height: 100dvh; margin: 0; background: radial-gradient(circle at 87% 5%, rgb(220 234 229 / 80%), transparent 29rem), var(--page); color: var(--ink); font-family: var(--font-body); }
button, input { font: inherit; }
a { color: inherit; }

.skip-link { position: fixed; left: 16px; top: 12px; z-index: 20; padding: 10px 14px; border-radius: 8px; background: var(--surface-strong); color: var(--ink-inverse); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.secondary-shell { width: min(1360px, calc(100% - 32px)); min-height: 100dvh; margin: 0 auto; }
.secondary-topbar { display: flex; min-height: 78px; align-items: center; justify-content: space-between; border-bottom: 1px solid color-mix(in srgb, var(--line) 78%, transparent); }
.secondary-wordmark { display: inline-flex; min-height: 52px; align-items: center; gap: 12px; text-decoration: none; }
.secondary-wordmark-symbol { width: 48px; height: 32px; flex: 0 0 auto; overflow: visible; }
.secondary-route { fill: none; stroke: var(--accent); stroke-width: 1.7; stroke-linecap: round; }
.secondary-arrow, .secondary-junction, .secondary-destination { fill: var(--gold); }
.secondary-origin { fill: var(--accent-strong); }
.secondary-junction { stroke: var(--page); stroke-width: 1; }
.secondary-wordmark > span { display: grid; gap: 1px; }
.secondary-wordmark strong { font: 700 1rem/1.25 var(--font-display); }
.secondary-wordmark small { color: var(--ink-soft); font-size: .68rem; }
.secondary-notice { color: var(--ink-soft); font-size: .72rem; font-weight: 680; }

.secondary-workspace { display: grid; grid-template-columns: 230px minmax(0, 1fr); min-height: calc(100dvh - 78px); }
.secondary-rail { position: sticky; top: 0; align-self: start; min-height: calc(100dvh - 78px); padding: 46px 28px 32px 4px; border-right: 1px solid color-mix(in srgb, var(--line) 76%, transparent); }
.secondary-rail-intro > span { color: var(--accent); font-size: .7rem; font-weight: 780; letter-spacing: .08em; }
.secondary-rail-intro p { margin: 12px 0 32px; color: var(--ink-soft); font-size: .76rem; line-height: 1.7; }
.secondary-progress { display: grid; gap: 18px; margin: 0; padding: 0; list-style: none; }
.secondary-progress li { display: grid; grid-template-columns: 26px 1fr; gap: 10px; align-items: start; color: var(--ink-soft); }
.secondary-progress li > span { display: grid; width: 26px; height: 26px; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: color-mix(in srgb, var(--surface) 58%, transparent); font-size: .65rem; font-weight: 760; }
.secondary-progress p { display: grid; gap: 2px; margin: 2px 0 0; }
.secondary-progress strong { font-size: .76rem; }
.secondary-progress small { font-size: .63rem; line-height: 1.45; }
.secondary-progress .is-current { color: var(--accent-strong); }
.secondary-progress .is-current > span { border-color: var(--accent); background: var(--accent); color: var(--ink-inverse); }
.secondary-progress .is-complete > span { border-color: color-mix(in srgb, var(--accent) 42%, var(--line)); background: var(--accent-soft); color: var(--accent-strong); }
.secondary-rail-return { display: grid; gap: 6px; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); }
.secondary-rail-return span { color: var(--ink-soft); font-size: .63rem; }
.secondary-rail-return strong { font: 700 .78rem/1.45 var(--font-display); }

.secondary-content { min-width: 0; padding: clamp(44px, 6vw, 82px) clamp(30px, 6vw, 88px) 88px; outline: none; }
#secondary-screen { width: min(960px, 100%); margin: 0 auto; }
.secondary-screen-header { max-width: 820px; margin-bottom: 34px; }
.secondary-screen-header > span { display: block; margin-bottom: 12px; color: var(--accent); font-size: .7rem; font-weight: 780; letter-spacing: .08em; }
.secondary-screen-header h1 { margin: 0; font: 700 clamp(2rem, 4.5vw, 3.65rem)/1.16 var(--font-display); letter-spacing: -.035em; text-wrap: balance; }
.secondary-screen-header p { max-width: 62ch; margin: 17px 0 0; color: var(--ink-soft); font-size: .92rem; line-height: 1.8; text-wrap: pretty; }

.secondary-promise { display: grid; grid-template-columns: repeat(3, 1fr); margin-bottom: 28px; border: 1px solid var(--line); border-radius: 14px; background: color-mix(in srgb, var(--surface) 76%, transparent); }
.secondary-promise p { display: grid; gap: 4px; min-height: 76px; align-content: center; margin: 0; padding: 16px 20px; }
.secondary-promise p + p { border-left: 1px solid var(--line); }
.secondary-promise span { color: var(--ink-soft); font-size: .63rem; }
.secondary-promise strong { font-size: .82rem; }

.secondary-question-stack { display: grid; gap: 18px; }
.secondary-question-stack fieldset { min-width: 0; margin: 0; padding: clamp(22px, 3vw, 32px); border: 1px solid var(--line); border-radius: 16px; background: var(--surface); box-shadow: 0 15px 34px rgb(35 61 53 / 6%); }
.secondary-question-stack legend { padding: 0 8px 0 0; font: 700 clamp(1rem, 2vw, 1.25rem)/1.5 var(--font-display); }
.secondary-question-stack fieldset > p { margin: 4px 0 18px; color: var(--ink-soft); font-size: .75rem; line-height: 1.65; }
.secondary-choice-grid { display: grid; gap: 10px; }
.secondary-grid-three { grid-template-columns: repeat(3, 1fr); }
.secondary-grid-four { grid-template-columns: repeat(2, 1fr); }
.secondary-grid-five { grid-template-columns: repeat(5, 1fr); }
.secondary-choice { position: relative; display: block; cursor: pointer; }
.secondary-choice input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.secondary-choice > span { display: grid; min-height: 98px; align-content: start; gap: 8px; padding: 17px; border: 1px solid var(--line); border-radius: 11px; background: color-mix(in srgb, var(--surface) 72%, var(--surface-muted)); transition: border-color 160ms ease, background 160ms ease, transform 160ms ease; }
.secondary-choice strong { font-size: .8rem; line-height: 1.45; }
.secondary-choice small { color: var(--ink-soft); font-size: .67rem; line-height: 1.55; }
.secondary-choice:hover > span { border-color: color-mix(in srgb, var(--accent) 42%, var(--line)); transform: translateY(-1px); }
.secondary-choice input:checked + span { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
.secondary-choice input:focus-visible + span { outline: 3px solid color-mix(in srgb, var(--accent) 28%, transparent); outline-offset: 2px; }
.secondary-selection-status { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 8px 0 0; color: var(--ink-soft); font-size: .68rem; }
.secondary-selection-status strong { flex: 0 0 auto; color: var(--accent); font-size: .67rem; }
.secondary-validation { margin: 0; padding: 12px 14px; border-radius: 9px; background: #f5e4df; color: var(--danger); font-size: .74rem; font-weight: 680; }

.secondary-return { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; overflow: hidden; margin-top: 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--line); }
.secondary-return p { display: grid; gap: 8px; min-height: 104px; align-content: center; margin: 0; padding: 20px; background: color-mix(in srgb, var(--surface) 85%, var(--page)); }
.secondary-return span { color: var(--ink-soft); font-size: .63rem; }
.secondary-return strong { font-size: .75rem; line-height: 1.55; }

.secondary-actions { position: fixed; right: 24px; bottom: 20px; z-index: 8; display: flex; align-items: center; gap: 14px; padding: 8px; border: 1px solid color-mix(in srgb, var(--line) 74%, transparent); border-radius: 13px; background: rgb(255 253 248 / 88%); box-shadow: 0 14px 38px rgb(31 54 47 / 13%); backdrop-filter: blur(14px); }
.secondary-actions > span { min-width: 88px; color: var(--ink-soft); font-size: .66rem; font-weight: 680; text-align: center; }
.secondary-actions button { min-height: 44px; padding: 0 18px; border-radius: 9px; font-size: .76rem; font-weight: 740; cursor: pointer; }
.secondary-button { border: 1px solid var(--accent); background: transparent; color: var(--accent-strong); }
.primary-button { border: 1px solid var(--accent); background: var(--accent); color: var(--ink-inverse); }
.secondary-actions button:hover:not(:disabled) { filter: brightness(.94); }
.secondary-actions button:active:not(:disabled) { transform: translateY(1px); }
.secondary-actions button:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 30%, transparent); outline-offset: 2px; }
.secondary-actions button:disabled { opacity: .38; cursor: not-allowed; }

.secondary-result-lead { display: grid; grid-template-columns: 1.4fr .6fr; gap: 28px; align-items: end; margin-bottom: 22px; padding: 28px; border-radius: 16px; background: var(--surface-strong); color: var(--ink-inverse); }
.secondary-result-lead p { margin: 0; font: 700 clamp(1.05rem, 2.3vw, 1.42rem)/1.65 var(--font-display); }
.secondary-result-lead span { color: rgb(249 245 236 / 64%); font-size: .67rem; line-height: 1.6; }
.secondary-evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.secondary-evidence-grid article { padding: 26px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.secondary-evidence-grid h2, .secondary-next-actions h2, .secondary-sources h2 { margin: 0 0 16px; font: 700 1rem/1.4 var(--font-display); }
.secondary-evidence-grid ul { display: grid; gap: 12px; margin: 0; padding-left: 1.1rem; color: var(--ink-soft); }
.secondary-evidence-grid li { padding-left: 4px; font-size: .76rem; line-height: 1.65; }
.secondary-route-compare { margin-top: 16px; padding: 30px; border: 1px solid var(--line); border-radius: 16px; background: color-mix(in srgb, var(--accent-soft) 42%, var(--surface)); }
.secondary-route-compare > header { max-width: 650px; margin-bottom: 24px; }
.secondary-route-compare h2 { margin: 0; font: 700 1.25rem/1.4 var(--font-display); }
.secondary-route-compare header p { margin: 8px 0 0; color: var(--ink-soft); font-size: .76rem; line-height: 1.65; }
.secondary-route-compare > div { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.secondary-route-compare article { padding: 22px; border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line)); border-radius: 12px; background: var(--surface); }
.secondary-route-compare article > span { color: var(--accent); font-size: .67rem; font-weight: 780; letter-spacing: .04em; }
.secondary-route-compare h3 { margin: 8px 0; font: 700 .9rem/1.5 var(--font-display); }
.secondary-route-compare article p { margin: 0; color: var(--ink-soft); font-size: .72rem; line-height: 1.65; }
.secondary-result-boundaries { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.secondary-result-boundaries p { display: grid; gap: 8px; margin: 0; padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.secondary-result-boundaries span { color: var(--ink-soft); font-size: .65rem; }
.secondary-result-boundaries strong { font-size: .76rem; line-height: 1.6; }
.secondary-next-actions { margin-top: 16px; padding: 28px; border-radius: 16px; background: var(--surface-strong); color: var(--ink-inverse); }
.secondary-next-actions ol { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.secondary-next-actions li { display: grid; grid-template-columns: 30px 1fr; gap: 12px; align-items: start; }
.secondary-next-actions li > span { display: grid; width: 28px; height: 28px; place-items: center; border: 1px solid rgb(249 245 236 / 24%); border-radius: 50%; color: #d8ba77; font-size: .68rem; font-weight: 760; }
.secondary-next-actions p { margin: 3px 0 0; color: rgb(249 245 236 / 82%); font-size: .76rem; line-height: 1.65; }
.secondary-deep-cta { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: end; margin-top: 16px; padding: 30px; border: 1px solid color-mix(in srgb, var(--gold) 48%, var(--line)); border-radius: 16px; background: var(--surface); }
.secondary-deep-cta > div > span { color: var(--gold); font-size: .67rem; font-weight: 760; }
.secondary-deep-cta h2 { max-width: 680px; margin: 8px 0; font: 700 1.25rem/1.45 var(--font-display); }
.secondary-deep-cta p { max-width: 66ch; margin: 0; color: var(--ink-soft); font-size: .74rem; line-height: 1.65; }
.secondary-deep-cta button { min-height: 46px; padding: 0 18px; border: 1px solid var(--accent); border-radius: 9px; background: var(--accent); color: var(--ink-inverse); font-size: .74rem; font-weight: 760; cursor: pointer; }
.secondary-sources { margin-top: 16px; padding: 26px; border-top: 1px solid var(--line); }
.secondary-sources p { margin: 0; color: var(--ink-soft); font-size: .72rem; line-height: 1.65; }
.secondary-sources > div { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 12px; }
.secondary-sources a { color: var(--accent-strong); font-size: .68rem; font-weight: 680; }

.methodology-principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: var(--line); }
.methodology-principles p { display: grid; gap: 9px; min-height: 142px; align-content: center; margin: 0; padding: 22px; background: var(--surface); }
.methodology-principles strong { font: 700 .9rem/1.45 var(--font-display); }
.methodology-principles span { color: var(--ink-soft); font-size: .71rem; line-height: 1.65; }
.methodology-modules { margin-top: 30px; }
.methodology-modules > h2, .methodology-report h2, .methodology-hold h2 { margin: 0 0 18px; font: 700 1.25rem/1.4 var(--font-display); }
.methodology-modules > div { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.methodology-modules article { padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.methodology-modules h3 { margin: 0 0 7px; font: 700 .82rem/1.45 var(--font-display); }
.methodology-modules p { margin: 0; color: var(--ink-soft); font-size: .7rem; line-height: 1.65; }
.methodology-report { display: grid; grid-template-columns: 1.25fr .75fr; gap: 30px; margin-top: 16px; padding: 28px; border-radius: 16px; background: var(--surface-strong); color: var(--ink-inverse); }
.methodology-report p { margin: 0; color: rgb(249 245 236 / 72%); font-size: .74rem; line-height: 1.7; }
.methodology-report ul { display: grid; gap: 7px; margin: 0; padding-left: 1.1rem; color: rgb(249 245 236 / 82%); font-size: .72rem; }
.methodology-hold { margin-top: 16px; padding: 26px; border: 1px solid color-mix(in srgb, var(--gold) 46%, var(--line)); border-radius: 14px; background: #faf2df; }
.methodology-hold p { margin: 0; color: var(--ink-soft); font-size: .73rem; line-height: 1.7; }

.secondary-legal { display: flex; width: min(1360px, calc(100% - 32px)); min-height: 94px; align-items: center; justify-content: space-between; gap: 24px; margin: 0 auto; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .68rem; }
.secondary-legal > div { display: grid; gap: 3px; }
.secondary-legal strong { color: var(--ink); font-family: var(--font-display); }
.secondary-legal nav { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.secondary-legal a { display: inline-flex; min-height: 44px; align-items: center; font-weight: 650; text-decoration: none; }
.secondary-legal a:hover { color: var(--accent); text-decoration: underline; }

@media (max-width: 1080px) {
  .secondary-grid-five { grid-template-columns: repeat(3, 1fr); }
  .secondary-content { padding-inline: 36px; }
}

@media (max-width: 760px) {
  .secondary-shell, .secondary-legal { width: 100%; }
  .secondary-topbar { min-height: 68px; padding: 0 16px; }
  .secondary-wordmark small, .secondary-notice { display: none; }
  .secondary-workspace { display: block; min-height: auto; }
  .secondary-rail { position: static; min-height: 0; padding: 16px; border-right: 0; border-bottom: 1px solid var(--line); }
  .secondary-rail-intro, .secondary-rail-return { display: none; }
  .secondary-progress { grid-template-columns: repeat(5, 1fr); gap: 5px; }
  .secondary-progress li { display: grid; grid-template-columns: 1fr; justify-items: center; gap: 4px; text-align: center; }
  .secondary-progress p { margin: 0; }
  .secondary-progress small { display: none; }
  .secondary-progress strong { font-size: .58rem; }
  .secondary-progress li > span { width: 24px; height: 24px; }
  .secondary-content { padding: 30px 16px 104px; }
  .secondary-screen-header { margin-bottom: 24px; }
  .secondary-screen-header h1 { font-size: clamp(2rem, 9.5vw, 2.8rem); line-height: 1.16; }
  .secondary-screen-header p { font-size: .84rem; line-height: 1.72; }
  .secondary-promise { grid-template-columns: 1fr; }
  .secondary-promise p { min-height: 58px; }
  .secondary-promise p + p { border-left: 0; border-top: 1px solid var(--line); }
  .secondary-grid-three, .secondary-grid-four, .secondary-grid-five { grid-template-columns: 1fr; }
  .secondary-question-stack fieldset { padding: 20px 16px; }
  .secondary-choice > span { min-height: 80px; }
  .secondary-return { grid-template-columns: 1fr; }
  .secondary-return p { min-height: 84px; }
  .secondary-actions { right: 0; bottom: 0; left: 0; justify-content: space-between; gap: 8px; padding: 10px 16px max(10px, env(safe-area-inset-bottom)); border-width: 1px 0 0; border-radius: 0; background: rgb(244 239 230 / 94%); }
  .secondary-actions > span { min-width: 74px; }
  .secondary-actions button { min-width: 94px; padding-inline: 13px; }
  .secondary-result-lead, .secondary-deep-cta, .methodology-report { grid-template-columns: 1fr; }
  .secondary-evidence-grid, .secondary-route-compare > div, .secondary-result-boundaries, .methodology-principles, .methodology-modules > div { grid-template-columns: 1fr; }
  .secondary-result-lead { gap: 16px; padding: 24px 20px; }
  .secondary-route-compare, .secondary-next-actions, .secondary-deep-cta { padding: 22px 18px; }
  .secondary-legal { min-height: 142px; align-items: flex-start; flex-direction: column; justify-content: center; padding: 18px 16px 90px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}