/*
 * 战胜癌症 — visual system.
 *
 * DIRECTION "破晓": a deep pine-black ground carries the promise, one amber
 * line carries the hope, and everything below it is quiet, legible paper. The
 * subject is serious, so the page is calm and typographic rather than
 * decorative; the single warm accent is spent once, in the hero, and never
 * competes with the evidence colours further down.
 *
 * No external fonts or assets are loaded — the site promises no outbound
 * requests, so hierarchy comes from weight, scale, spacing and colour.
 */

:root {
  color-scheme: light;

  /* Ground — the dark register: header, hero, code. */
  --ground: #0c1614;
  --ground-2: #14231f;
  --ground-3: #1d312c;
  --on-ground: #eef3f0;
  --on-ground-dim: #9aada6;

  /* Paper — neutrals biased toward the accent, so they read as chosen. */
  --paper: #f1f4f0;
  --paper-2: #e4e9e3;
  --white: #fcfdfb;
  --ink: #101a17;
  --muted: #57655f;
  --line: #d3dad3;
  --line-soft: #e6eae5;

  /* Accent — deep teal for structure and action. */
  --accent: #0f6e6a;
  --accent-deep: #0a4f4d;
  --accent-soft: #dcebe8;

  /* Dawn — the one warm note. Used in the hero and for "current step". */
  --dawn: #c9812c;
  --dawn-soft: #f6ecd9;

  /* Semantic, kept separate from the accent. */
  --signal: #b8422c;
  --signal-soft: #f7e4de;
  --success: #1e6a52;

  /* Reader-chosen text scale. Every px font size is multiplied by it, so the
     whole site enlarges together instead of one element outgrowing its box. */
  --ts: 1;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(16, 26, 23, .04), 0 18px 40px -28px rgba(16, 26, 23, .45);
  --shadow-lift: 0 2px 4px rgba(16, 26, 23, .05), 0 28px 60px -34px rgba(16, 26, 23, .5);

  --sans: "Segoe UI Variable Display", "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "Cascadia Mono", "SF Mono", Consolas, "Liberation Mono", monospace;

  font-family: var(--sans);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 116px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-size: calc(15px * var(--ts)); line-height: 1.62; -webkit-font-smoothing: antialiased; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
button, a, input { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px;
}
::selection { color: var(--white); background: var(--accent); }
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--paper-2); }
::-webkit-scrollbar-thumb { background: #a9b4ad; border: 3px solid var(--paper-2); border-radius: 10px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }

/* ------------------------------------------------------------------ */
/* Shell                                                               */
/* ------------------------------------------------------------------ */

.app-shell { min-height: 100vh; display: flex; flex-direction: column; }
main { min-width: 0; flex: 1; }

/* Every text block sits on one measure. Full-bleed blocks opt out. */
.measure, .patient-section, .patient-trust-strip, .workspace-header, .onboarding, .analysis-form,
.workspace, .job-toolbar, .results, .method-note, .account-section, .admin-panel,
.research-tool-browser, .legal-section, .auth-panel, .research-gate, footer {
  width: min(1180px, 100% - clamp(32px, 6vw, 96px));
  margin-inline: auto;
}

/* ---- top bar ---- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: clamp(16px, 3vw, 44px);
  padding: 0 clamp(16px, 3vw, 48px); height: 66px;
  color: var(--on-ground); background: var(--ground);
}
.brand { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; }
/* 品牌标识（AI Conquer Cancer 6b）。标准色：分子线条 #4d170e、红环 #ec3013、
   「AI」金属渐变、英文副标 #ae1800。深色顶栏用反白版：线条换暖白、英文副标提亮，
   红环保持品牌红。线宽随显示尺寸略加粗——原稿 1.8 是按 200px 以上画的，缩到
   顶栏高度会细得发虚。 */
.brand-logo { width: 46px; height: 34px; flex: none; overflow: visible; }
.brand-logo-line { stroke: #f3e9e4; stroke-width: 3.2; }
.brand-logo-ring { stroke: #ec3013; stroke-width: 3.8; }
.brand-logo-color .brand-logo-line { stroke: #4d170e; }
.brand-name { display: grid; line-height: 1.15; }
.brand-word { font-size: calc(17px * var(--ts)); font-weight: 700; letter-spacing: .08em; color: #f7f1ee; }
.brand-ai {
  margin-right: 6px; font-family: "Archivo Black", "Arial Black", "Helvetica Neue", Arial, sans-serif;
  font-weight: 900; letter-spacing: -.02em;
  background: linear-gradient(160deg, #e4e8eb 0%, #aab2b9 28%, #eef1f3 52%, #8a939a 78%, #d6dbdf 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand-name em { font-style: normal; font-family: "Archivo", "Helvetica Neue", Arial, sans-serif; font-size: calc(9.5px * var(--ts)); font-weight: 700; letter-spacing: .24em; color: #ff5a3d; }
footer .brand-logo { width: 40px; height: 30px; }
footer .brand-ai { background: linear-gradient(160deg, #aab2b9 0%, #767e85 20%, #434a4f 46%, #9ba3aa 62%, #363c41 84%, #7e868d 100%); -webkit-background-clip: text; background-clip: text; }
footer .footer-brand strong { color: #4d170e; }

.audience-switch { display: flex; gap: 2px; padding: 3px; border: 1px solid rgba(255, 255, 255, .14); border-radius: 999px; }
.audience-button { border: 0; border-radius: 999px; padding: 6px 17px; color: var(--on-ground-dim); background: transparent; cursor: pointer; font-size: calc(13px * var(--ts)); transition: color .18s, background .18s; }
.audience-button:hover { color: var(--on-ground); }
.audience-button.active { color: var(--ground); background: var(--on-ground); font-weight: 600; }

.topbar-end { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.build-stamp { font-family: var(--mono); font-size: calc(10.5px * var(--ts)); letter-spacing: .1em; color: rgba(154, 173, 166, .75); }

/* ---- section nav ---- */
.subnav { position: sticky; top: 66px; z-index: 29; background: rgba(241, 244, 240, .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.subnav nav { width: min(1180px, 100% - clamp(32px, 6vw, 96px)); margin-inline: auto; display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.subnav nav::-webkit-scrollbar { display: none; }
.nav-item { position: relative; border: 0; background: transparent; cursor: pointer; padding: 14px 14px 12px; color: var(--muted); font-size: calc(13.5px * var(--ts)); white-space: nowrap; }
.nav-item::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 0; height: 2px; background: transparent; }
.nav-item:hover { color: var(--ink); }
.nav-item.active { color: var(--ink); font-weight: 600; }
.nav-item.active::after { background: var(--accent); }

/* ------------------------------------------------------------------ */
/* Hero                                                                */
/* ------------------------------------------------------------------ */

/* 首屏这一条从近黑改成绿——用的就是全站的 --accent 这支深青绿，所以它和站里
   其余部分是一家人，不是另外贴上去的一块颜色。

   最亮的那一端定在 --accent (#0f6e6a) 而不是更亮的绿：眉标、副标题都压在这一端，
   底色再亮上去，它们的对比度就不够了。本站有老年友好的放大字号，读不清是硬伤。 */
.hero {
  position: relative; overflow: hidden;
  padding: clamp(40px, 6vw, 76px) 0 0;
  color: var(--on-ground);
  background: radial-gradient(120% 140% at 8% 0%, var(--accent) 0%, var(--accent-deep) 55%, #063a37 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.028) 1px, transparent 1px);
  background-size: 100% 46px; pointer-events: none;
}
.hero-inner { position: relative; width: min(1180px, 100% - clamp(32px, 6vw, 96px)); margin-inline: auto; }
/* 暖橙在绿底上只有约 1.4:1，读不出来。换成暖调的浅色：暖的意思保住了，
   对比度回到 4.9:1。 */
.hero-eyebrow { display: inline-block; font-family: var(--mono); font-size: calc(11px * var(--ts)); letter-spacing: .18em; color: var(--dawn-soft); }

.hero-title { margin: 20px 0 0; font-weight: 700; letter-spacing: -.015em; line-height: 1.06; }
/* One line, always: 10 glyphs at 5.2vw can never exceed the measure. */
.hero-line { display: block; white-space: nowrap; font-size: clamp(23px, 5.2vw, 66px); }
.hero-title em { display: block; margin-top: .2em; font-style: normal; font-weight: 400; letter-spacing: .06em; color: var(--dawn); font-size: clamp(14px, 2vw, 25px); }

.dawn-rule { display: block; height: 2px; margin: clamp(18px, 3vw, 30px) 0 0; background: linear-gradient(90deg, var(--dawn), rgba(201, 129, 44, 0)); transform-origin: left; animation: dawn-draw 1.1s cubic-bezier(.2, .7, .3, 1) both; }
@keyframes dawn-draw { from { transform: scaleX(0); } to { transform: scaleX(1); } }

.hero-lede { max-width: 62ch; margin: 25px 0 0; color: #dfe9e5; font-size: clamp(14.5px, 1.4vw, 17px); line-height: 1.78; }
.hero-actions { margin: 30px 0 clamp(36px, 5.4vw, 62px); display: flex; flex-wrap: wrap; gap: 12px; }

.hero-route { position: relative; width: min(1180px, 100% - clamp(32px, 6vw, 96px)); margin: 0 auto; padding: 0 0 clamp(20px, 3vw, 34px); list-style: none; display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: rgba(255, 255, 255, .1); border-top: 1px solid rgba(255, 255, 255, .12); }
.hero-route li { padding: 15px 16px 4px; display: grid; gap: 5px; background: transparent; }
.hero-route b { font-family: var(--mono); font-size: calc(11px * var(--ts)); font-weight: 500; letter-spacing: .1em; color: var(--dawn); }
.hero-route span { font-size: calc(13.5px * var(--ts)); color: #c3d1cb; }
@media (max-width: 720px) { .hero-route { grid-template-columns: repeat(2, 1fr); } .hero-route li:last-child { grid-column: 1 / -1; } }

/* ---- trust strip ---- */
.patient-trust-strip { margin-top: clamp(28px, 4vw, 44px); display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.patient-trust-strip div { padding: 18px 20px; background: var(--white); }
.patient-trust-strip strong { display: block; font-size: calc(14.5px * var(--ts)); }
.patient-trust-strip span { display: block; margin-top: 3px; color: var(--muted); font-size: calc(12.5px * var(--ts)); }

/* ------------------------------------------------------------------ */
/* Buttons and small parts                                             */
/* ------------------------------------------------------------------ */

.primary-button { display: inline-flex; align-items: center; gap: 9px; border: 0; border-radius: 999px; padding: 12px 24px; color: var(--white); background: var(--accent); cursor: pointer; font-size: calc(14px * var(--ts)); font-weight: 600; transition: background .18s, transform .18s; }
.primary-button:hover { background: var(--accent-deep); }
.primary-button:active { transform: translateY(1px); }
.hero .primary-button { color: var(--ground); background: var(--dawn); }
.hero .primary-button:hover { background: #dd9339; }
.secondary-button { display: inline-flex; align-items: center; gap: 9px; border: 1px solid var(--line); border-radius: 999px; padding: 11px 22px; color: var(--ink); background: transparent; cursor: pointer; font-size: calc(14px * var(--ts)); text-decoration: none; transition: border-color .18s, color .18s; }
.secondary-button:hover { border-color: var(--accent); color: var(--accent); }
.hero .secondary-button { border-color: rgba(255, 255, 255, .26); color: var(--on-ground); }
.hero .secondary-button:hover { border-color: var(--dawn); color: var(--dawn); }
.text-button { border: 0; background: transparent; padding: 0; color: var(--accent); cursor: pointer; font-size: calc(13px * var(--ts)); text-decoration: underline; text-underline-offset: 3px; }
.text-button:hover { color: var(--accent-deep); }
.icon-button { display: inline-grid; place-items: center; width: 32px; height: 32px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--white); color: var(--muted); cursor: pointer; }
.icon-button:hover { border-color: var(--accent); color: var(--accent); }
.add-button { display: inline-flex; align-items: center; gap: 7px; border: 1px dashed var(--line); border-radius: var(--radius-sm); padding: 8px 14px; background: transparent; color: var(--accent); cursor: pointer; font-size: calc(13px * var(--ts)); }
.add-button:hover { border-color: var(--accent); border-style: solid; }
.icon { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

.index-mark { font-family: var(--mono); font-size: calc(10.5px * var(--ts)); letter-spacing: .16em; color: var(--accent); text-transform: uppercase; }
.section-number { font-family: var(--mono); font-size: calc(12px * var(--ts)); letter-spacing: .1em; color: var(--dawn); }

/* ------------------------------------------------------------------ */
/* Sections                                                            */
/* ------------------------------------------------------------------ */

.patient-section { padding: clamp(48px, 7vw, 88px) 0 0; }
.public-section-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 14px 32px; padding-bottom: 22px; margin-bottom: 26px; border-bottom: 1px solid var(--line); }
.public-section-heading h2 { margin: 8px 0 0; font-size: clamp(22px, 2.8vw, 31px); letter-spacing: -.02em; font-weight: 700; }
.public-section-heading > p { margin: 0; max-width: 52ch; color: var(--muted); font-size: calc(13.5px * var(--ts)); }
.section-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 14px 28px; }
.section-heading h2, .section-heading h3 { margin: 7px 0 0; font-size: calc(21px * var(--ts)); letter-spacing: -.01em; }
.section-heading > p { margin: 0; color: var(--muted); font-size: calc(13px * var(--ts)); }

/* ---- shared form controls ---- */
.check-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 9px; }
.check-grid label { display: flex; align-items: center; gap: 10px; padding: 11px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); cursor: pointer; font-size: calc(13.5px * var(--ts)); transition: border-color .16s, background .16s; }
.check-grid label:hover { border-color: var(--accent); }
.check-grid input { width: 17px; height: 17px; accent-color: var(--accent); flex: none; }
.form-submit { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 14px; padding-top: 20px; border-top: 1px solid var(--line-soft); }
.form-submit p { margin: 0; color: var(--muted); font-size: calc(12.5px * var(--ts)); }

/* ---- care path ---- */
.care-path { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.care-step { display: grid; gap: 4px; justify-items: start; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); cursor: pointer; text-align: left; transition: border-color .16s, transform .16s; }
.care-step:hover { border-color: var(--accent); transform: translateY(-2px); }
.care-step span { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; background: var(--paper-2); color: var(--muted); font-family: var(--mono); font-size: calc(11px * var(--ts)); }
.care-step strong { font-size: calc(14.5px * var(--ts)); }
.care-step small { color: var(--muted); font-size: calc(12px * var(--ts)); }
.care-step.active { border-color: var(--accent); background: var(--accent-soft); }
.care-step.active span { background: var(--accent); color: var(--white); }
.care-step-detail { margin-top: 18px; padding: 26px 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); box-shadow: var(--shadow); }
.care-step-detail h3 { margin: 9px 0 10px; font-size: calc(20px * var(--ts)); }
.care-step-detail p { margin: 0 0 18px; max-width: 70ch; color: var(--muted); }
.care-step-detail > div { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding-top: 16px; border-top: 1px solid var(--line-soft); }
.care-step-detail > div strong { width: 100%; margin-bottom: 4px; font-size: calc(13px * var(--ts)); }
.care-step-detail > div span { padding: 6px 13px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-deep); font-size: calc(12.5px * var(--ts)); }

/* ---- knowledge ---- */
.knowledge-search { padding: 22px 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); box-shadow: var(--shadow); }
.knowledge-search label { display: grid; gap: 4px; font-size: calc(14px * var(--ts)); font-weight: 650; }
.knowledge-search small { color: var(--muted); font-size: calc(12px * var(--ts)); font-weight: 400; }
.knowledge-search div { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 10px; }
.knowledge-search input { flex: 1 1 260px; min-width: 0; border: 1px solid var(--line); border-radius: 999px; padding: 11px 18px; background: var(--paper); }
.knowledge-search button { border: 0; border-radius: 999px; padding: 11px 24px; background: var(--accent); color: var(--white); cursor: pointer; font-size: calc(14px * var(--ts)); font-weight: 600; }
.knowledge-search button:hover { background: var(--accent-deep); }

.knowledge-answer { margin-top: 16px; padding: 22px 24px; border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; background: var(--white); }
.knowledge-answer > span { font-family: var(--mono); font-size: calc(11px * var(--ts)); letter-spacing: .12em; color: var(--accent); }
.knowledge-answer strong { display: block; margin: 6px 0 8px; font-size: calc(16px * var(--ts)); }
.knowledge-answer p { margin: 0 0 8px; }
.knowledge-answer small { display: block; margin-top: 12px; color: var(--muted); font-size: calc(12px * var(--ts)); }
.knowledge-answer.urgent { border-left-color: var(--signal); background: var(--signal-soft); }

.topic-filter { margin: 26px 0 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.topic-button { border: 1px solid var(--line); border-radius: 999px; padding: 7px 16px; background: var(--white); cursor: pointer; font-size: calc(13px * var(--ts)); color: var(--muted); }
.topic-button:hover { border-color: var(--accent); color: var(--accent); }
.topic-button.active { border-color: var(--accent); background: var(--accent); color: var(--white); }

.knowledge-results { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 12px; }
.knowledge-entry { display: grid; align-content: start; padding: 20px 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); transition: border-color .16s, box-shadow .16s; }
.knowledge-entry:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.knowledge-entry > div { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.knowledge-entry > div span { color: var(--muted); font-size: calc(11.5px * var(--ts)); }
.knowledge-entry > div strong { font-family: var(--mono); font-size: calc(12px * var(--ts)); color: var(--line); }
.knowledge-entry h3 { margin: 10px 0 8px; font-size: calc(16.5px * var(--ts)); letter-spacing: -.01em; }
.knowledge-entry p { margin: 0 0 12px; color: var(--muted); font-size: calc(13.5px * var(--ts)); }
.knowledge-entry ul { margin: 0 0 12px; padding-left: 18px; display: grid; gap: 4px; font-size: calc(13px * var(--ts)); }
.knowledge-entry li::marker { color: var(--accent); }
.knowledge-entry a { display: inline-flex; align-items: center; gap: 6px; color: var(--accent); text-decoration: none; font-size: calc(13px * var(--ts)); font-weight: 600; }
.knowledge-entry a:hover { text-decoration: underline; text-underline-offset: 3px; }
.knowledge-empty { padding: 30px; border: 1px dashed var(--line); border-radius: var(--radius); text-align: center; }
.knowledge-empty strong { display: block; margin-bottom: 5px; }
.knowledge-empty p { margin: 0; color: var(--muted); font-size: calc(13px * var(--ts)); }

/* ---- sources ---- */
.source-ledger { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 10px; }
.source-ledger a { display: grid; gap: 4px; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); color: inherit; text-decoration: none; transition: border-color .16s, transform .16s; }
.source-ledger a:hover { border-color: var(--accent); transform: translateY(-2px); }
.source-ledger span { font-family: var(--mono); font-size: calc(10.5px * var(--ts)); letter-spacing: .12em; color: var(--dawn); }
.source-ledger strong { font-size: calc(15px * var(--ts)); }
.source-ledger small { color: var(--muted); font-size: calc(12.5px * var(--ts)); }
.source-note { margin: 16px 0 0; color: var(--muted); font-size: calc(12.5px * var(--ts)); }

/* ---- about / founders ---- */
/* ---- 关于我们 ----
   原来这里是一个圆圈套着「战」字。那是通用装饰，和这个项目没有关系。
   换掉它的不是另一个图标，而是内容：这个站的身份就是「可核对」，所以让它
   用自己的真实数字说话，并把「明确不做什么」写出来——那句话原本写在小标题里，
   下面却一直没有对应的内容。 */

.about-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 20px; align-items: start; }

.about-label {
  display: block;
  font-family: var(--mono);
  font-size: calc(11px * var(--ts));
  letter-spacing: .16em;
  color: var(--accent);
  margin-bottom: 10px;
}

.about-who {
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
}
.about-who h3 { margin: 0; font-size: clamp(19px, 2.2vw, 25px); letter-spacing: -.015em; font-weight: 700; line-height: 1.35; }
.about-who > p { margin: 11px 0 0; max-width: 58ch; color: var(--muted); font-size: calc(13.5px * var(--ts)); line-height: 1.8; }
.about-contact { border-top: 1px solid var(--line-soft); padding-top: 15px; margin-top: 18px !important; }
.about-mail {
  display: inline-block;
  margin: 9px 0 4px;
  font-family: var(--mono);
  font-size: calc(15px * var(--ts));
  color: var(--accent-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--accent-soft);
}
.about-mail:hover { border-bottom-color: var(--accent); }

/* 数字是当场取回来的，不是写死的——这一栏本身就该经得起核对。 */
.about-facts {
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--accent-soft);
}
.about-numbers { margin: 0; display: grid; gap: 14px; }
.about-numbers > div { display: grid; gap: 2px; }
.about-numbers dt { font-size: calc(12.5px * var(--ts)); color: var(--accent-deep); }
.about-numbers dd {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--accent-deep);
  font-variant-numeric: tabular-nums;
}
.about-facts-note {
  margin: 16px 0 0;
  padding-top: 13px;
  border-top: 1px solid rgba(15, 110, 106, .18);
  font-size: calc(12px * var(--ts));
  line-height: 1.7;
  color: var(--accent-deep);
}

.about-columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 20px; }
.about-column {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}
.about-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.about-list li {
  padding-left: 16px;
  border-left: 2px solid var(--line);
  font-size: calc(13px * var(--ts));
  line-height: 1.8;
  color: var(--muted);
}
.about-list li b { display: block; color: var(--ink); font-size: calc(14px * var(--ts)); font-weight: 650; margin-bottom: 2px; }
/* 「做」与「不做」是两种承诺，颜色上要分得开：一条是能力，一条是边界。 */
.about-list.do li { border-left-color: var(--accent); }
.about-list.dont li { border-left-color: var(--signal); }

@media (max-width: 900px) {
  .about-grid, .about-columns { grid-template-columns: 1fr; }
  .about-numbers { grid-template-columns: repeat(3, 1fr); gap: 12px; }
}
@media (max-width: 480px) {
  .about-numbers { grid-template-columns: 1fr; }
}

.patient-boundary { width: min(1180px, 100% - clamp(32px, 6vw, 96px)); margin: clamp(36px, 5vw, 60px) auto 0; padding: 26px 30px; border-radius: var(--radius); background: var(--ground); color: var(--on-ground); }
.patient-boundary strong { display: block; margin-bottom: 7px; color: var(--dawn); font-size: calc(14px * var(--ts)); }
.patient-boundary p { margin: 0; max-width: 78ch; color: #c3d1cb; font-size: calc(13.5px * var(--ts)); }

/* ------------------------------------------------------------------ */
/* Research workbench                                                  */
/* ------------------------------------------------------------------ */

.workspace-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 28px; padding: clamp(40px, 6vw, 72px) 0 0; }
.workspace-header h1 { margin: 12px 0 12px; font-size: clamp(26px, 3.6vw, 44px); line-height: 1.14; letter-spacing: -.025em; font-weight: 700; }
.workspace-header h1 em { font-style: normal; color: var(--accent); }
.workspace-header > div > p { margin: 0; max-width: 58ch; color: var(--muted); font-size: calc(14px * var(--ts)); }
.header-proof { display: flex; gap: 26px; }
.header-proof span { display: grid; gap: 2px; color: var(--muted); font-size: calc(11.5px * var(--ts)); }
.header-proof b { font-family: var(--mono); font-size: calc(24px * var(--ts)); font-weight: 500; color: var(--ink); font-variant-numeric: tabular-nums; }

.analysis-form { margin-top: clamp(24px, 4vw, 40px); padding: clamp(22px, 3vw, 34px); display: grid; gap: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); box-shadow: var(--shadow); }
.form-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px; padding-bottom: 20px; border-bottom: 1px solid var(--line-soft); }
.form-heading h2 { margin: 7px 0 0; font-size: calc(21px * var(--ts)); }
.preset-group { display: flex; flex-wrap: wrap; gap: 7px; }
.preset-button { border: 1px solid var(--line); border-radius: 999px; padding: 7px 15px; background: var(--white); cursor: pointer; font-family: var(--mono); font-size: calc(12px * var(--ts)); color: var(--muted); }
.preset-button:hover { border-color: var(--accent); color: var(--accent); }
.preset-button.active { border-color: var(--accent); background: var(--accent); color: var(--white); }

.sample-fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.sample-fields label, .variant-row label { display: grid; gap: 5px; font-size: calc(13px * var(--ts)); }
.sample-fields label > span, .variant-row label > span { font-weight: 650; }
.sample-fields small { color: var(--muted); font-size: calc(11.5px * var(--ts)); }
.sample-fields input, .variant-row input { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 9px 12px; background: var(--paper); }
.sample-fields input:focus, .variant-row input:focus { background: var(--white); }

.variant-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 12px; }
.variant-heading span { font-size: calc(14px * var(--ts)); font-weight: 650; }
.variant-heading small { display: block; margin-top: 2px; color: var(--muted); font-size: calc(12px * var(--ts)); }
.variant-rows { display: grid; gap: 9px; }
.variant-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr) 100px minmax(0, 1fr) auto; gap: 10px; align-items: end; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); }
.variant-row .icon-button { align-self: end; }
@media (max-width: 860px) { .variant-row { grid-template-columns: 1fr 1fr; } }

.form-submit { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; padding-top: 20px; border-top: 1px solid var(--line-soft); }
.method-flags { display: flex; flex-wrap: wrap; gap: 7px; }
.method-flags span { position: relative; padding: 5px 12px 5px 24px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-deep); font-size: calc(12px * var(--ts)); }
.method-flags span::before { content: ""; position: absolute; left: 11px; top: 50%; width: 5px; height: 5px; margin-top: -2.5px; border-radius: 50%; background: var(--accent); }

/* ---- results ---- */
.results { margin-top: clamp(20px, 3vw, 32px); display: grid; gap: 16px; }
.empty-result, .loading-result, .error-result { padding: 44px 34px; border: 1px dashed var(--line); border-radius: var(--radius); background: var(--white); }
.empty-result h3, .loading-result h3, .error-result h3 { margin: 10px 0 8px; font-size: calc(20px * var(--ts)); }
.empty-result p, .loading-result p, .error-result p { margin: 0 0 8px; max-width: 66ch; color: var(--muted); font-size: calc(13.5px * var(--ts)); }
.loading-result { position: relative; overflow: hidden; }
.scan-line { position: absolute; left: 0; right: 0; top: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--accent), transparent); animation: scan 1.6s linear infinite; }
@keyframes scan { from { transform: translateY(0); } to { transform: translateY(240px); } }
.skeleton-lines { display: grid; gap: 8px; margin-top: 18px; }
.skeleton-lines i { height: 9px; border-radius: 5px; background: var(--paper-2); }
.skeleton-lines i:nth-child(2) { width: 78%; }
.skeleton-lines i:nth-child(3) { width: 52%; }
.error-result { border-style: solid; border-color: #e5c8c0; background: var(--signal-soft); }

.result-mast { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 24px; padding: 30px 32px; border-radius: var(--radius); background: var(--ground); color: var(--on-ground); }
.result-mast .index-mark { color: var(--dawn); }
.result-mast h2 { margin: 9px 0 10px; font-size: clamp(22px, 3vw, 32px); letter-spacing: -.02em; }
.result-mast p { margin: 0; max-width: 68ch; color: #c3d1cb; font-size: calc(13.5px * var(--ts)); }
.result-mast.declined { background: #2a1a17; }
.decision-seal { display: grid; place-items: center; width: 96px; height: 96px; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; flex: none; }
.decision-seal span { font-family: var(--mono); font-size: calc(30px * var(--ts)); color: var(--dawn); }
.decision-seal small { font-family: var(--mono); font-size: calc(9px * var(--ts)); letter-spacing: .16em; color: var(--on-ground-dim); }

.run-ledger { display: flex; flex-wrap: wrap; gap: 8px; }
.run-ledger span { display: inline-flex; align-items: center; gap: 6px; padding: 6px 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--white); color: var(--muted); font-size: calc(12px * var(--ts)); }
.run-ledger .icon { width: 13px; height: 13px; }

.evidence-section { padding: 26px 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.evidence-section .section-heading { padding-bottom: 18px; margin-bottom: 20px; border-bottom: 1px solid var(--line-soft); }
.variant-ledger { display: grid; gap: 10px; }
.variant-entry { display: grid; grid-template-columns: minmax(140px, auto) minmax(150px, auto) minmax(0, 1fr); gap: 18px; align-items: start; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); }
.locus strong { display: block; font-size: calc(15px * var(--ts)); }
.locus code { font-family: var(--mono); font-size: calc(12.5px * var(--ts)); color: var(--accent); }
.variant-facts { display: grid; gap: 5px; font-size: calc(12px * var(--ts)); color: var(--muted); }
.variant-entry p { margin: 0 0 8px; font-size: calc(13px * var(--ts)); color: var(--muted); }
.status { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: calc(11.5px * var(--ts)); font-weight: 650; }
.status.driver { background: var(--accent-soft); color: var(--accent-deep); }
.status.likely_driver { background: var(--dawn-soft); color: #8a5c15; }
.status.uncertain { background: var(--paper-2); color: var(--muted); }
.status.likely_passenger { background: var(--signal-soft); color: #8c3320; }
.source-detail summary { cursor: pointer; color: var(--accent); font-size: calc(12.5px * var(--ts)); }
.source-detail p { margin: 8px 0 4px; font-size: calc(12px * var(--ts)); }
.source-detail small { color: var(--muted); font-size: calc(11.5px * var(--ts)); }
@media (max-width: 860px) { .variant-entry { grid-template-columns: 1fr; gap: 10px; } }

.evidence-ledger { margin-top: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); }
.evidence-ledger summary { cursor: pointer; font-size: calc(13px * var(--ts)); font-weight: 600; }
.evidence-ledger article { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line-soft); }
.evidence-ledger strong { margin-right: 8px; }
.evidence-ledger p { margin: 7px 0 4px; font-size: calc(12.5px * var(--ts)); color: var(--muted); }
.evidence-ledger small { color: var(--muted); font-size: calc(11.5px * var(--ts)); }

.hypothesis-list { display: grid; gap: 10px; }
.hypothesis-entry { display: grid; grid-template-columns: auto minmax(140px, auto) minmax(180px, 1fr) auto; gap: 18px; align-items: center; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); }
.hypothesis-entry .rank { font-family: var(--mono); font-size: calc(13px * var(--ts)); color: var(--line); }
.target-name strong { display: block; font-size: calc(16px * var(--ts)); }
.target-name span { color: var(--muted); font-size: calc(12px * var(--ts)); }
.route-arrow { display: flex; align-items: center; gap: 9px; font-family: var(--mono); font-size: calc(12px * var(--ts)); color: var(--muted); }
.route-arrow .icon { width: 15px; height: 15px; color: var(--accent); }
.evidence-grade { text-align: right; }
.evidence-grade strong { display: block; font-family: var(--mono); font-size: calc(17px * var(--ts)); }
.evidence-grade span { color: var(--muted); font-size: calc(11.5px * var(--ts)); }
.hypothesis-copy { grid-column: 1 / -1; }
.hypothesis-copy p { margin: 0 0 8px; font-size: calc(13px * var(--ts)); color: var(--muted); }
.inline-warning { grid-column: 1 / -1; display: flex; align-items: center; gap: 8px; padding: 9px 13px; border-radius: var(--radius-sm); background: var(--dawn-soft); color: #7d5412; font-size: calc(12.5px * var(--ts)); }
@media (max-width: 900px) { .hypothesis-entry { grid-template-columns: auto 1fr; } .evidence-grade { text-align: left; } }

.decline-panel { display: grid; grid-template-columns: 4px minmax(0, 1fr); gap: 22px; padding: 28px 30px; border: 1px solid #e5c8c0; border-radius: var(--radius); background: var(--signal-soft); }
.stop-rule { background: var(--signal); border-radius: 2px; }
.decline-panel h3 { margin: 9px 0 8px; font-size: calc(20px * var(--ts)); }
.decline-panel p { margin: 0 0 12px; max-width: 70ch; font-size: calc(13.5px * var(--ts)); }
.decline-panel ul { margin: 0; padding-left: 20px; display: grid; gap: 6px; font-size: calc(13px * var(--ts)); }
.decline-panel li::marker { color: var(--signal); }

.candidate-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.candidate-tab { display: grid; gap: 2px; padding: 10px 18px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--white); cursor: pointer; text-align: left; }
.candidate-tab span { color: var(--muted); font-size: calc(11.5px * var(--ts)); }
.candidate-tab strong { font-family: var(--mono); font-size: calc(14px * var(--ts)); }
.candidate-tab.active { border-color: var(--accent); background: var(--accent-soft); }
.candidate-sheet { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 24px; padding: 22px 24px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); }
@media (max-width: 900px) { .candidate-sheet { grid-template-columns: 1fr; } }
.smiles-line { display: flex; align-items: center; gap: 10px; margin: 10px 0 16px; }
.smiles-line code { flex: 1; min-width: 0; overflow-x: auto; padding: 10px 13px; border-radius: var(--radius-sm); background: var(--ground); color: #a8d5cf; font-family: var(--mono); font-size: calc(12px * var(--ts)); white-space: nowrap; }
.property-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(88px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.property-strip span { display: grid; gap: 2px; padding: 11px 13px; background: var(--white); }
.property-strip small { color: var(--muted); font-size: calc(11px * var(--ts)); }
.property-strip strong { font-family: var(--mono); font-size: calc(15px * var(--ts)); font-variant-numeric: tabular-nums; }
.reason-list { margin-top: 16px; }
.reason-list h4 { margin: 0 0 8px; font-size: calc(13px * var(--ts)); }
.reason-list p { margin: 0 0 6px; font-size: calc(12.5px * var(--ts)); color: var(--muted); }
.score-atlas h4 { margin: 0 0 12px; font-size: calc(13px * var(--ts)); }
.score-row { display: grid; grid-template-columns: 74px minmax(0, 1fr) 38px; gap: 10px; align-items: center; margin-bottom: 8px; font-size: calc(12.5px * var(--ts)); }
.score-track { height: 6px; border-radius: 3px; background: var(--paper-2); overflow: hidden; }
.score-track i { display: block; height: 100%; background: var(--accent); }
.score-row strong { font-family: var(--mono); font-size: calc(12px * var(--ts)); text-align: right; font-variant-numeric: tabular-nums; }
.score-note { margin: 14px 0 0; color: var(--muted); font-size: calc(12px * var(--ts)); }

.risk-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 10px; margin-top: 14px; }
.risk-grid article { padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); }
.risk-grid h4 { margin: 8px 0 6px; font-size: calc(14px * var(--ts)); }
.risk-grid p { margin: 0; color: var(--muted); font-size: calc(12.5px * var(--ts)); }

.audit-footer { padding: 22px 26px; border-radius: var(--radius); background: var(--ground); color: #c3d1cb; }
.audit-footer > div { display: flex; align-items: center; gap: 9px; margin-bottom: 8px; color: var(--dawn); }
.audit-footer strong { font-size: calc(13.5px * var(--ts)); }
.audit-footer p { margin: 0; max-width: 82ch; font-size: calc(12.5px * var(--ts)); }

/* ---- method ---- */
.method-note { margin-top: clamp(36px, 5vw, 60px); padding: clamp(26px, 4vw, 40px); border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.method-note h2 { margin: 9px 0 0; font-size: clamp(21px, 2.6vw, 28px); letter-spacing: -.02em; }
.method-columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-top: 6px; }
.method-columns p { margin: 0; color: var(--muted); font-size: calc(13px * var(--ts)); }
.method-columns strong { display: block; margin-bottom: 6px; color: var(--ink); font-size: calc(13.5px * var(--ts)); }

/* ---- tool browser ---- */
.research-tool-browser { margin-top: clamp(28px, 4vw, 44px); padding: clamp(24px, 3vw, 34px); border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.research-tool-browser h2 { margin: 8px 0 6px; font-size: calc(21px * var(--ts)); }
.research-tool-browser > div > p { margin: 0; max-width: 76ch; color: var(--muted); font-size: calc(13px * var(--ts)); }
.tool-status { display: flex; align-items: center; gap: 11px; margin: 18px 0; padding: 13px 16px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); }
.tool-status i { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex: none; }
.tool-status.available i { background: var(--success); box-shadow: 0 0 0 4px rgba(30, 106, 82, .14); }
.tool-status strong { font-size: calc(13.5px * var(--ts)); }
.tool-status span { color: var(--muted); font-size: calc(12.5px * var(--ts)); }
#tooluniverse-find-form label { display: block; margin-bottom: 8px; font-size: calc(13px * var(--ts)); font-weight: 650; }
#tooluniverse-find-form div { display: flex; flex-wrap: wrap; gap: 10px; }
#tooluniverse-find-form input { flex: 1 1 260px; min-width: 0; border: 1px solid var(--line); border-radius: 999px; padding: 10px 17px; background: var(--paper); }
#tooluniverse-find-result { margin: 16px 0 0; padding: 16px 18px; overflow-x: auto; border-radius: var(--radius-sm); background: var(--ground); color: #a8d5cf; font-family: var(--mono); font-size: calc(12px * var(--ts)); line-height: 1.7; }

/* ---- specimen intro (kept for compatibility) ---- */
.specimen-intro { display: flex; gap: 24px; align-items: center; }
.sequence-rail { display: flex; align-items: center; gap: 5px; font-family: var(--mono); font-size: calc(11px * var(--ts)); color: var(--muted); }
.sequence-rail i { width: 3px; height: 20px; border-radius: 2px; background: var(--accent); opacity: .5; }

/* ------------------------------------------------------------------ */
/* Footer                                                              */
/* ------------------------------------------------------------------ */

footer { margin-top: clamp(48px, 7vw, 90px); padding: 34px 0 44px; display: flex; flex-wrap: wrap; align-items: center; gap: 18px 32px; border-top: 1px solid var(--line); }
.footer-brand { display: flex; align-items: center; gap: 11px; }
.footer-brand strong { display: block; font-size: calc(14px * var(--ts)); letter-spacing: .04em; }
.footer-brand small { color: var(--muted); font-family: var(--mono); font-size: calc(11px * var(--ts)); }
footer > p { margin: 0; color: var(--muted); font-size: calc(12.5px * var(--ts)); }
.footer-back { margin-left: auto; color: var(--accent); text-decoration: none; font-size: calc(13px * var(--ts)); }
.footer-back:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ------------------------------------------------------------------ */
/* Toast                                                               */
/* ------------------------------------------------------------------ */

.toast { position: fixed; left: 50%; bottom: 26px; z-index: 70; display: flex; align-items: center; gap: 10px; padding: 13px 20px; border-radius: 999px; background: var(--ground); color: var(--on-ground); font-size: calc(13.5px * var(--ts)); box-shadow: var(--shadow-lift); transform: translate(-50%, 20px); opacity: 0; pointer-events: none; transition: opacity .22s, transform .22s; }
.toast.visible { opacity: 1; transform: translate(-50%, 0); }
.toast .icon { width: 16px; height: 16px; }
.toast.success .icon { color: #6fc9a6; }
.toast.warning .icon { color: var(--dawn); }
.toast.error .icon { color: #e8917a; }

/* ------------------------------------------------------------------ */
/* Narrow screens                                                      */
/* ------------------------------------------------------------------ */

@media (max-width: 760px) {
  .topbar { height: auto; flex-wrap: wrap; padding-top: 12px; padding-bottom: 12px; gap: 12px 18px; }
  .topbar-end { width: 100%; margin-left: 0; justify-content: space-between; }
  .subnav { top: 0; }
  .brand-name em { display: none; }
  .header-proof { gap: 18px; }
}

/* ---------------- 字号与老年友好 ---------------- */

:root[data-textsize="large"] { --ts: 1.15; }
:root[data-textsize="xlarge"] { --ts: 1.32; }

/* Enlarged text means enlarged targets: the same reader who needs bigger type
   usually needs a bigger thing to tap. */
:root[data-textsize="large"] button,
:root[data-textsize="large"] .nav-item,
:root[data-textsize="xlarge"] button,
:root[data-textsize="xlarge"] .nav-item { min-height: 44px; }
:root[data-textsize="xlarge"] .marker-options label,
:root[data-textsize="xlarge"] .check-grid label { padding: 12px 14px; }

.textsize-control { display: inline-flex; align-items: center; gap: 2px; padding: 3px; border: 1px solid rgba(255, 255, 255, .14); border-radius: 999px; }
.textsize-control > span { padding-inline: 7px; font-size: calc(10.5px * var(--ts)); letter-spacing: .1em; color: var(--on-ground-dim); }
.textsize-button { border: 0; border-radius: 999px; background: transparent; color: var(--on-ground-dim); cursor: pointer; padding: 4px 9px; line-height: 1; font-weight: 700; }
.textsize-button[data-step="normal"] { font-size: calc(11px * var(--ts)); }
.textsize-button[data-step="large"] { font-size: calc(13px * var(--ts)); }
.textsize-button[data-step="xlarge"] { font-size: calc(15px * var(--ts)); }
.textsize-button:hover { color: var(--on-ground); }
.textsize-button.active { background: rgba(255, 255, 255, .16); color: var(--on-ground); }

@media (prefers-contrast: more) {
  :root { --muted: #33403a; --line: #8f9d96; }
  a, .text-button { text-decoration: underline; }
}

/* ---------------- 手机 ---------------- */

/* Adapted to the screen, not to a device model: a user-agent string can lie and
   new phones ship constantly, but the viewport is always the truth. */
@media (max-width: 720px) {
  .topbar { flex-wrap: wrap; gap: 8px 12px; padding-block: 10px; position: static; }
  .brand-name { font-size: calc(15px * var(--ts)); }
  .brand-name em { display: none; }
  .audience-switch { order: 3; width: 100%; }
  .audience-button { flex: 1; text-align: center; padding-block: 9px; }
  .topbar-end { gap: 8px; }
  .build-stamp { display: none; }
  .subnav { top: 0; }
  .nav-item { padding: 12px 11px 10px; }

  .patient-section, .legal-section, .news-section { padding-inline: clamp(14px, 4vw, 22px); }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions button { width: 100%; }

  /* Tap targets: 44px is the size a thumb actually hits. */
  button, .nav-item, select, input[type="search"] { min-height: 44px; }
  .check-grid label, .marker-options label, .topic-button, .chip-button { min-height: 40px; }

  .news-list, .drug-group ul, .reading-list, .gap-list, .support-list { grid-template-columns: 1fr; }
  .drug-card dl > div { grid-template-columns: 1fr; gap: 2px; }
  .plan-block, .plan-head { padding-inline: 15px; }
  .plan-block-head { align-items: flex-start; flex-direction: column; }
  /*
   * 结果页顶部四个操作按钮。
   *
   * 挤在一行的后果是「保存清／单」「修改信／息」这样的断行——中文可以在任意
   * 两个字之间断开，按钮一窄就从词中间切。改成两列，并且禁止词内断行：宁可一行
   * 放两个按钮，也不要把「保存清单」劈成两截。
   */
  .plan-actions,
  .plan-summary .plan-actions { width: 100%; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .plan-actions button,
  .plan-summary .plan-actions button { width: 100%; word-break: keep-all; }
  .plan-actions button { flex: 1; }
  .trial-links a { width: 100%; justify-content: center; }
}

@media (max-width: 420px) {
  .audience-button { font-size: calc(12px * var(--ts)); }
  .careplan-row { grid-template-columns: 1fr; }
  .news-search { grid-template-columns: 1fr; }
  .marker-options { grid-template-columns: 1fr; }
}