:root {
  --paper: #f4f1e9;
  --paper-strong: #fffdf8;
  --ink: #17241f;
  --muted: #667069;
  --forest: #173f32;
  --forest-2: #275f4a;
  --mint: #d9eadd;
  --sage: #afc9b8;
  --amber: #e7b85d;
  --amber-soft: #faedcf;
  --rose-soft: #f3dfda;
  --sky-soft: #dfeaed;
  --line: #d9d9cf;
  --shadow: 0 18px 55px rgba(32, 50, 42, 0.1);
  --radius: 20px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% -10%, rgba(231, 184, 93, 0.14), transparent 28rem),
    radial-gradient(circle at 100% 10%, rgba(39, 95, 74, 0.09), transparent 32rem),
    var(--paper);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
}

button, input, select { font: inherit; }
button { color: inherit; }
a { color: inherit; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 9px 13px;
  border-radius: 9px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  min-height: 76px;
  padding: 12px clamp(18px, 4vw, 64px);
  border-bottom: 1px solid rgba(23, 36, 31, 0.08);
  background: rgba(244, 241, 233, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  width: max-content;
  text-decoration: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  aspect-ratio: 1;
  border-radius: 12px 12px 12px 3px;
  background: var(--forest);
  color: #fff;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
}
.brand strong { display: block; font-size: 15px; letter-spacing: .02em; }
.brand small { display: block; color: var(--muted); font-size: 11px; }

.view-tabs {
  display: flex;
  gap: 3px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.5);
}
.view-tab {
  border: 0;
  border-radius: 999px;
  padding: 8px 14px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
}
.view-tab:hover, .view-tab:focus-visible { color: var(--forest); }
.view-tab.is-active { background: var(--paper-strong); color: var(--forest); box-shadow: 0 3px 12px rgba(31,49,41,.08); }

.random-button {
  justify-self: end;
  border: 0;
  border-radius: 999px;
  padding: 10px 15px;
  background: var(--forest);
  color: white;
  cursor: pointer;
}
.random-button:hover { background: var(--forest-2); }

main { padding: 0 clamp(18px, 4vw, 64px) 80px; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(330px, .75fr);
  gap: clamp(36px, 7vw, 110px);
  align-items: end;
  max-width: 1500px;
  margin: 0 auto;
  padding: clamp(64px, 9vw, 130px) 0 clamp(48px, 6vw, 80px);
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--forest-2);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.hero h1 {
  max-width: 830px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(46px, 6.7vw, 94px);
  font-weight: 500;
  letter-spacing: -.045em;
  line-height: .98;
}
.hero-lead {
  max-width: 730px;
  margin: 26px 0 0;
  color: #4c5a53;
  font-size: clamp(16px, 1.6vw, 21px);
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}
.hero-stats div { padding: 19px 8px 17px 0; }
.hero-stats strong { display: block; font-family: var(--serif); font-size: clamp(30px, 3vw, 44px); font-weight: 500; }
.hero-stats span { color: var(--muted); font-size: 12px; }

.toolbar {
  position: sticky;
  z-index: 12;
  top: 76px;
  display: grid;
  grid-template-columns: minmax(260px, 680px) auto;
  gap: 10px;
  align-items: center;
  max-width: 1500px;
  margin: 0 auto 26px;
  padding: 12px 0;
  background: linear-gradient(var(--paper) 80%, transparent);
}
.search-box {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 11px;
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-strong);
  box-shadow: 0 10px 25px rgba(32,50,42,.05);
}
.search-box > span:first-child { color: var(--forest); font-family: var(--serif); font-size: 26px; transform: rotate(-20deg); }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--ink); }
.search-box input::placeholder { color: #879089; }
kbd { border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px; background: #f2f0ea; color: var(--muted); font-size: 11px; }
.filter-toggle {
  display: none;
  border: 1px solid var(--line);
  border-radius: 14px;
  min-height: 48px;
  padding: 0 14px;
  background: var(--paper-strong);
}
.filter-toggle span { display: inline-grid; place-items: center; min-width: 19px; height: 19px; margin-left: 4px; border-radius: 999px; background: var(--forest); color: white; font-size: 10px; }

.workspace {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: clamp(28px, 4vw, 62px);
  max-width: 1500px;
  margin: 0 auto;
}
.filters {
  position: sticky;
  top: 154px;
  align-self: start;
  max-height: calc(100vh - 170px);
  overflow-y: auto;
  padding: 0 10px 20px 0;
}
.filter-heading { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 24px; }
.filter-heading h2 { margin: 0; font-family: var(--serif); font-size: 20px; font-weight: 500; }
.filter-heading button { border: 0; background: none; color: var(--forest-2); font-size: 12px; cursor: pointer; }
.filter-group { margin-bottom: 26px; }
.filter-group h3 { margin: 0 0 10px; color: var(--muted); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.filter-options { display: grid; gap: 5px; }
.filter-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 7px 9px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.filter-option span:last-child { color: #939a94; font-size: 11px; }
.filter-option:hover { background: rgba(255,255,255,.6); }
.filter-option.is-active { background: var(--forest); color: white; }
.filter-option.is-active span:last-child { color: #d7e7db; }
.filter-note { padding-top: 13px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }

.content-view { min-width: 0; }
.results-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.results-heading .eyebrow { margin-bottom: 4px; }
.results-heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(28px, 3vw, 42px); font-weight: 500; }
.sort-control { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 12px; }
.sort-control select { border: 0; border-bottom: 1px solid var(--line); padding: 6px 20px 6px 4px; background: transparent; color: var(--ink); outline: 0; }
.active-filters { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 16px; }
.active-chip { border: 1px solid var(--sage); border-radius: 999px; padding: 5px 10px; background: #edf5ef; color: var(--forest); font-size: 11px; cursor: pointer; }

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.prompt-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 338px;
  overflow: hidden;
  padding: 22px;
  border: 1px solid rgba(23,36,31,.11);
  border-radius: var(--radius);
  background: rgba(255,253,248,.76);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.prompt-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: var(--accent, var(--forest));
  opacity: .8;
}
.prompt-card:hover { transform: translateY(-3px); border-color: var(--sage); box-shadow: var(--shadow); }
.card-topline { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.prompt-id { color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .1em; }
.evidence-badge { border-radius: 999px; padding: 5px 8px; background: var(--badge-bg, var(--mint)); color: var(--badge-fg, var(--forest)); font-size: 10px; white-space: nowrap; }
.prompt-card h3 { margin: 22px 0 12px; font-family: var(--serif); font-size: clamp(21px, 1.75vw, 29px); font-weight: 500; line-height: 1.16; }
.card-cn { margin: 0; color: var(--muted); font-size: 12px; }
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 18px 0; }
.tag { border: 1px solid var(--line); border-radius: 999px; padding: 4px 8px; color: #58645d; font-size: 10px; }
.route-peek { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-top: auto; }
.route-peek span { padding: 9px; border-radius: 10px; background: #f0eee7; color: #415048; font-size: 10px; line-height: 1.35; }
.card-action { display: flex; align-items: center; justify-content: space-between; margin-top: 16px; padding: 0; border: 0; background: none; color: var(--forest-2); font-size: 12px; font-weight: 700; cursor: pointer; }
.card-action span:last-child { font-size: 17px; transition: transform .2s ease; }
.prompt-card:hover .card-action span:last-child { transform: translateX(4px); }

.empty-state { padding: 80px 20px; border: 1px dashed var(--line); border-radius: var(--radius); text-align: center; color: var(--muted); }
.empty-state > span { font-family: var(--serif); font-size: 48px; }
.empty-state h3 { margin: 8px 0; color: var(--ink); }
.empty-state p { margin: 0; }

.view-intro { max-width: 760px; margin: -4px 0 24px; color: var(--muted); }
.module-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.module-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-strong); }
.module-symbol { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; background: var(--mint); color: var(--forest); font-family: var(--serif); font-size: 22px; }
.module-card h3 { margin: 16px 0 6px; font-family: var(--serif); font-size: 23px; font-weight: 500; }
.module-card > p { margin: 0 0 14px; color: var(--muted); font-size: 12px; }
.module-links { display: flex; flex-wrap: wrap; gap: 6px; }
.module-link { border: 0; border-radius: 999px; padding: 5px 9px; background: #f0eee7; color: var(--forest-2); font-size: 10px; cursor: pointer; }
.module-link:hover { background: var(--amber-soft); }

.method-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 10px; margin-bottom: 28px; }
.method-card { padding: 18px; border-radius: 16px; background: var(--paper-strong); }
.method-card strong { display: block; margin-bottom: 7px; color: var(--forest); }
.method-card p { margin: 0; color: var(--muted); font-size: 12px; }
.source-list { display: grid; gap: 10px; }
.source-row { display: grid; grid-template-columns: 160px 1fr auto; gap: 22px; align-items: start; padding: 20px; border-top: 1px solid var(--line); }
.source-row h3 { margin: 0; font-family: var(--serif); font-size: 20px; font-weight: 500; }
.source-row p { margin: 0; color: var(--muted); font-size: 12px; }
.source-row a { color: var(--forest-2); font-size: 12px; text-decoration-thickness: 1px; text-underline-offset: 3px; }

.prompt-dialog {
  width: min(1080px, calc(100vw - 28px));
  max-height: calc(100vh - 28px);
  padding: 0;
  border: 0;
  border-radius: 24px;
  background: var(--paper-strong);
  box-shadow: 0 35px 100px rgba(15, 30, 24, .35);
}
.prompt-dialog::backdrop { background: rgba(17, 31, 25, .54); backdrop-filter: blur(5px); }
.dialog-shell { position: relative; max-height: calc(100vh - 28px); overflow-y: auto; }
.dialog-close { position: sticky; z-index: 2; top: 14px; float: right; display: grid; place-items: center; width: 40px; height: 40px; margin: 14px 14px -54px 0; border: 1px solid var(--line); border-radius: 50%; background: rgba(255,253,248,.92); font-size: 24px; cursor: pointer; }
.detail-hero { padding: clamp(28px, 5vw, 64px); padding-right: clamp(72px, 8vw, 110px); background: linear-gradient(135deg, #e4eee5, #f7eed8); }
.detail-hero h2 { max-width: 850px; margin: 20px 0 14px; font-family: var(--serif); font-size: clamp(30px, 4.6vw, 56px); font-weight: 500; line-height: 1.08; }
.detail-meta { display: flex; flex-wrap: wrap; gap: 7px; }
.detail-cn { margin: 0; color: #506058; font-size: 14px; }
.detail-body { padding: clamp(24px, 4vw, 50px); }
.detail-section { margin-bottom: 42px; }
.detail-section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 14px; }
.detail-section h3 { margin: 0; font-family: var(--serif); font-size: 28px; font-weight: 500; }
.routes-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.route-card { overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: white; }
.route-header { padding: 20px; background: var(--route-bg, #edf3ec); }
.route-label { color: var(--forest-2); font-size: 10px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.route-header h4 { margin: 7px 0 4px; font-family: var(--serif); font-size: 23px; font-weight: 500; }
.route-header p { margin: 0; color: #4e5d55; font-size: 12px; }
.route-content { padding: 19px; }
.argument-step { display: grid; grid-template-columns: 24px 1fr; gap: 10px; padding: 10px 0; border-bottom: 1px solid #eeeae1; }
.argument-step:last-of-type { border-bottom: 0; }
.step-number { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--forest); color: white; font-family: var(--serif); font-size: 11px; }
.argument-step strong { display: block; font-size: 12px; }
.argument-step p { margin: 3px 0 0; color: var(--muted); font-size: 11px; }
.route-box { margin-top: 9px; padding: 12px; border-radius: 11px; background: #f6f3ec; }
.route-box strong { display: block; margin-bottom: 3px; color: var(--forest); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }
.route-box p { margin: 0; color: #536058; font-size: 11px; }
.phrase-list { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 12px; }
.phrase { padding: 4px 7px; border-radius: 7px; background: var(--amber-soft); color: #685126; font-size: 10px; }
.copy-route { width: 100%; margin-top: 13px; padding: 9px; border: 1px solid var(--sage); border-radius: 10px; background: transparent; color: var(--forest); cursor: pointer; }
.copy-route:hover { background: var(--mint); }
.connection-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 8px; }
.connection-button { display: grid; gap: 4px; padding: 14px; border: 1px solid var(--line); border-radius: 12px; background: white; text-align: left; cursor: pointer; }
.connection-button:hover { border-color: var(--sage); background: #f7fbf8; }
.connection-button strong { font-family: var(--serif); font-size: 16px; font-weight: 500; }
.connection-button span { color: var(--muted); font-size: 10px; }
.source-evidence { display: grid; gap: 8px; }
.variant-list { display: grid; gap: 8px; }
.variant-row { display: grid; grid-template-columns: minmax(0, 1fr) 150px; gap: 16px; padding: 16px; border: 1px solid var(--line); border-radius: 13px; background: white; }
.variant-row blockquote { margin: 0; font-family: var(--serif); font-size: 18px; line-height: 1.3; }
.variant-meta { display: grid; align-content: start; gap: 5px; color: var(--muted); font-size: 10px; }
.variant-meta strong { color: var(--forest); font-size: 11px; }
.variant-meta a { color: var(--forest-2); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.occurrence { display: grid; grid-template-columns: 90px 1fr auto; gap: 14px; align-items: center; padding: 12px 0; border-top: 1px solid var(--line); }
.occurrence time { color: var(--forest); font-weight: 700; font-size: 11px; }
.occurrence span { color: var(--muted); font-size: 11px; }
.occurrence a { color: var(--forest-2); font-size: 11px; }

.toast { position: fixed; z-index: 80; right: 20px; bottom: 20px; padding: 11px 15px; border-radius: 10px; background: var(--ink); color: white; opacity: 0; transform: translateY(8px); pointer-events: none; transition: .2s ease; }
.toast.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1180px) {
  .prompt-grid, .module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .method-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 860px) {
  .site-header { grid-template-columns: 1fr auto; }
  .view-tabs { position: fixed; z-index: 30; right: 12px; bottom: 12px; left: 12px; justify-content: center; box-shadow: var(--shadow); background: rgba(255,253,248,.96); }
  .random-button { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 56px; }
  .hero-stats { max-width: 520px; }
  .toolbar { top: 75px; grid-template-columns: 1fr auto; }
  .filter-toggle { display: block; }
  .workspace { grid-template-columns: 1fr; }
  .filters { position: fixed; z-index: 40; inset: 0 0 0 auto; width: min(330px, 90vw); max-height: none; padding: 30px 24px; background: var(--paper-strong); box-shadow: -20px 0 60px rgba(18,35,28,.2); transform: translateX(105%); transition: transform .22s ease; }
  .filters.is-open { transform: translateX(0); }
  .routes-grid { grid-template-columns: 1fr; }
}

@media (max-width: 590px) {
  .site-header { min-height: 68px; padding: 10px 16px; }
  .brand small { display: none; }
  main { padding: 0 14px 92px; }
  .hero { padding: 48px 4px 38px; }
  .hero h1 { font-size: 48px; }
  .hero-lead { font-size: 15px; }
  .hero-stats div { padding-right: 4px; }
  .hero-stats strong { font-size: 30px; }
  .hero-stats span { font-size: 10px; }
  .toolbar { top: 68px; }
  .search-box { padding: 0 12px; }
  .search-box kbd { display: none; }
  .prompt-grid, .module-grid, .method-grid { grid-template-columns: 1fr; }
  .prompt-card { min-height: 310px; }
  .results-heading { align-items: start; flex-direction: column; }
  .source-row { grid-template-columns: 1fr; gap: 8px; }
  .connection-list { grid-template-columns: 1fr; }
  .occurrence { grid-template-columns: 72px 1fr; }
  .occurrence a { grid-column: 2; }
  .variant-row { grid-template-columns: 1fr; }
  .prompt-dialog { width: 100vw; max-height: 100dvh; border-radius: 0; }
  .dialog-shell { max-height: 100dvh; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}