:root {
  color-scheme: light;
  --bg: #f7f3ea;
  --surface: #fffaf1;
  --surface-strong: #fff4df;
  --ink: #1c251f;
  --muted: #687166;
  --line: rgba(66, 78, 63, 0.18);
  --accent: #176b55;
  --accent-2: #d59b35;
  --danger-soft: #f6e6de;
  --shadow: 0 24px 70px rgba(49, 60, 48, 0.14);
  --radius: 24px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(23, 107, 85, 0.14), transparent 32rem),
    linear-gradient(135deg, #fbf7ef 0%, var(--bg) 58%, #efe6d5 100%);
  color: var(--ink);
  line-height: 1.55;
}
body.dark-theme {
  color-scheme: dark;
  --bg: #121712;
  --surface: #1c241d;
  --surface-strong: #263023;
  --ink: #f3eadb;
  --muted: #b8c0b0;
  --line: rgba(238, 229, 211, 0.16);
  --accent: #7fd2b6;
  --accent-2: #e8bd68;
  --danger-soft: #39251f;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
  background: radial-gradient(circle at top left, rgba(127, 210, 182, 0.16), transparent 30rem), #121712;
}
body.large-text { font-size: 18px; }
[hidden] { display: none !important; }

button, input { font: inherit; }
button { cursor: pointer; }
a { color: inherit; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  padding: .7rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  z-index: 20;
}
.skip-link:focus { top: 1rem; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem clamp(1rem, 4vw, 3rem);
  background: rgba(255, 250, 241, 0.82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.dark-theme .topbar { background: rgba(28, 36, 29, 0.84); }
.brand, .nav-links, .tools { display: flex; align-items: center; gap: .75rem; }
.brand { font-weight: 800; letter-spacing: -0.02em; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border-radius: .9rem;
  background: var(--accent);
  color: #fff;
  font-weight: 900;
}
.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 650;
  padding: .45rem .65rem;
  border-radius: 999px;
}
.nav-links a:hover { background: var(--surface-strong); color: var(--ink); }
.search-shell {
  display: flex;
  align-items: center;
  gap: .4rem;
  min-width: min(18rem, 35vw);
  padding: .5rem .7rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
}
.search-shell input, .guide-ai-input input {
  width: 100%;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
}
.tool-button, .button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .65rem .9rem;
  color: var(--ink);
  background: var(--surface);
  font-weight: 750;
}
.button.primary {
  color: white;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent), #0f513f);
  box-shadow: 0 14px 30px rgba(23, 107, 85, .22);
}

.section-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: clamp(1rem, 3vw, 2rem) auto;
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(18rem, .75fr);
  gap: clamp(1rem, 3vw, 2rem);
  align-items: stretch;
  padding-top: clamp(1rem, 4vw, 3rem);
}
.hero-copy, .hero-note, .reference-shell, .material-library-shell, .guide-ai-card, .topic-detail, .topic-browser, .category-panel, .material-why-card, .extracted-content-panel, .material-section-panel, .material-list-panel, .material-detail, .footer {
  background: rgba(255, 250, 241, .82);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.dark-theme .hero-copy,
.dark-theme .hero-note,
.dark-theme .reference-shell,
.dark-theme .material-library-shell,
.dark-theme .guide-ai-card,
.dark-theme .topic-detail,
.dark-theme .topic-browser,
.dark-theme .category-panel,
.dark-theme .material-why-card,
.dark-theme .extracted-content-panel,
.dark-theme .material-section-panel,
.dark-theme .material-list-panel,
.dark-theme .material-detail,
.dark-theme .footer { background: rgba(28, 36, 29, .88); }
.hero-copy { padding: clamp(1.5rem, 5vw, 4rem); }
.hero-note { padding: clamp(1.2rem, 3vw, 2rem); }
.hero h1 {
  margin: .25rem 0 1rem;
  font-size: clamp(2.6rem, 8vw, 5.8rem);
  line-height: .95;
  letter-spacing: -0.075em;
}
.lead { font-size: clamp(1.08rem, 2.2vw, 1.36rem); color: var(--muted); max-width: 62ch; }
.eyebrow {
  margin: 0 0 .45rem;
  color: var(--accent);
  font-size: .78rem;
  font-weight: 850;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.microcopy { color: var(--muted); font-size: .94rem; }
.hero-actions { margin: 1.3rem 0; display: flex; gap: .75rem; flex-wrap: wrap; }
.hero-note ul { padding-left: 1.1rem; color: var(--muted); }
.hero-note li + li { margin-top: .6rem; }

.section-heading { margin-bottom: 1rem; }
.split-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.section-heading h2 { margin: 0; font-size: clamp(1.75rem, 4vw, 3rem); letter-spacing: -0.055em; }
.section-heading p { color: var(--muted); max-width: 70ch; }
.soft-pill, .muted-count, .badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: .42rem .7rem;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--muted);
  font-weight: 750;
  white-space: nowrap;
}
.reference-shell, .material-library-shell { padding: clamp(1rem, 3vw, 2rem); }
.reference-layout {
  display: grid;
  grid-template-columns: 280px minmax(240px, .75fr) minmax(0, 1.35fr);
  gap: 1rem;
  align-items: start;
}
.category-panel, .topic-browser, .topic-detail { padding: 1rem; box-shadow: none; }
.material-why-card {
  margin-bottom: 1rem;
  padding: 1rem 1.1rem;
  box-shadow: none;
}
.material-why-card h3 { margin: 0 0 .35rem; }
.material-why-card p { margin: 0; color: var(--muted); }
.extracted-content-panel {
  margin-bottom: 1rem;
  padding: 1rem 1.1rem;
  box-shadow: none;
}
.compact-heading h3 { margin: 0; font-size: clamp(1.35rem, 2.6vw, 2rem); letter-spacing: -0.04em; }
.content-status-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .7rem;
  margin: .8rem 0 1rem;
}
.content-status-card {
  display: grid;
  gap: .2rem;
  padding: .8rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.35);
}
.dark-theme .content-status-card { background: rgba(255,255,255,.04); }
.content-status-card strong { font-size: 1.35rem; }
.content-status-card span { color: var(--muted); font-size: .9rem; }
.extracted-content-list, .content-record-list, .reference-article-list {
  display: grid;
  gap: .8rem;
}
.extracted-content-list { grid-template-columns: 1fr; }
.content-record-list, .reference-article-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.reference-article-list { margin-top: .8rem; }
.extracted-content-card, .content-record-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1rem;
  background: rgba(255,255,255,.28);
}
.dark-theme .extracted-content-card, .dark-theme .content-record-card { background: rgba(255,255,255,.04); }
.extracted-content-card h4, .content-record-card h4 { margin: .45rem 0 .5rem; font-size: 1.2rem; }
.extracted-content-card h5 { margin: 0 0 .35rem; }
.extracted-content-card ul { padding-left: 1.1rem; color: var(--muted); }
.content-record-card p { color: var(--muted); }
.material-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 0 0 1rem;
}
.material-filter-row label {
  display: grid;
  gap: .35rem;
  min-width: min(15rem, 100%);
  color: var(--muted);
  font-weight: 800;
}
.material-filter-row select {
  min-height: 2.7rem;
  padding: .55rem .75rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  background: var(--surface);
}
.material-layout {
  display: grid;
  grid-template-columns: 300px minmax(260px, .82fr) minmax(0, 1.18fr);
  gap: 1rem;
  align-items: start;
}
.material-section-panel, .material-list-panel, .material-detail { padding: 1rem; box-shadow: none; }
.category-list, .topic-list, .material-tier-list, .material-list { display: grid; gap: .7rem; }
.category-button, .topic-card, .material-tier-button, .material-card {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: .9rem;
  color: var(--ink);
  background: rgba(255,255,255,.34);
}
.dark-theme .category-button, .dark-theme .topic-card, .dark-theme .material-tier-button, .dark-theme .material-card { background: rgba(255,255,255,.04); }
.category-button, .material-tier-button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .35rem .7rem;
}
.category-button small, .material-tier-button small { grid-column: 1 / -1; color: var(--muted); }
.category-button.is-active, .topic-card.is-active, .material-tier-button.is-active, .material-card.is-active {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: color-mix(in srgb, var(--accent) 11%, var(--surface));
}
.topic-list-toolbar { display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.topic-card, .material-card { display: grid; gap: .22rem; }
.topic-card-category { color: var(--accent); font-size: .78rem; font-weight: 800; }
.topic-card small, .material-card small { color: var(--muted); }
.empty-card {
  border: 1px dashed var(--line);
  border-radius: 18px;
  padding: 1rem;
  color: var(--muted);
}
.topic-detail, .material-detail { min-height: 35rem; }
.topic-detail h2 { margin: 0 0 .8rem; font-size: clamp(1.75rem, 3.2vw, 2.75rem); letter-spacing: -0.055em; }
.material-detail h3 { margin: 0 0 .8rem; font-size: clamp(1.55rem, 2.8vw, 2.25rem); letter-spacing: -0.045em; }
.topic-summary { color: var(--muted); font-size: 1.05rem; }
.status-row { display: flex; flex-wrap: wrap; gap: .5rem; margin: -.25rem 0 .9rem; }
.status-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: .34rem .6rem;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--accent-2) 18%, var(--surface));
  color: var(--muted);
  font-size: .86rem;
  font-weight: 800;
}
.detail-block {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.detail-block h3 { margin: 0 0 .6rem; }
.key-point-list { margin: 0; padding-left: 1.2rem; }
.key-point-list li + li { margin-top: .55rem; }
.topic-chip-row { display: flex; flex-wrap: wrap; gap: .5rem; }
.topic-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .38rem .62rem;
  color: var(--muted);
  background: var(--surface-strong);
}
.source-material-block { background: var(--danger-soft); border-radius: 18px; padding: 1rem; border-top: 0; }
.detail-footer { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; color: var(--muted); font-size: .9rem; }
.detail-footer span { border: 1px solid var(--line); border-radius: 999px; padding: .32rem .6rem; }

.guide-ai-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, .65fr);
  gap: 1rem;
  padding: clamp(1.2rem, 3vw, 2rem);
}
.guide-ai-input {
  display: grid;
  gap: .4rem;
  align-self: start;
  padding: .85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface-strong);
}
.guide-ai-input span { color: var(--muted); font-weight: 800; }
.guide-ai-answer {
  grid-column: 1 / -1;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1rem;
  background: rgba(255,255,255,.35);
}
.dark-theme .guide-ai-answer { background: rgba(255,255,255,.04); }
.inline-topic-link {
  border: 0;
  padding: .15rem 0;
  background: transparent;
  color: var(--accent);
  font-weight: 800;
}

.internal-card { padding: .7rem; border: 1px solid var(--line); border-radius: 14px; }
.footer {
  width: min(1180px, calc(100% - 2rem));
  margin: 2rem auto;
  padding: 1rem 1.2rem;
  color: var(--muted);
  box-shadow: none;
}
.app-status {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  max-width: min(26rem, calc(100% - 2rem));
  padding: .75rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  color: var(--muted);
  font-weight: 750;
}
.app-status:empty { display: none; }

@media (max-width: 980px) {
  .topbar { align-items: stretch; flex-direction: column; }
  .nav-links, .tools { flex-wrap: wrap; }
  .search-shell { min-width: 100%; }
  .hero, .guide-ai-card { grid-template-columns: 1fr; }
  .reference-layout, .material-layout { grid-template-columns: 1fr; }
  .content-status-grid, .extracted-content-list, .content-record-list, .reference-article-list { grid-template-columns: 1fr; }
  .category-list, .material-tier-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .topic-detail, .material-detail { min-height: auto; }
}

@media (max-width: 640px) {
  .section-shell, .footer { width: min(100% - 1rem, 1180px); }
  .hero-copy, .hero-note, .reference-shell, .material-library-shell, .guide-ai-card { border-radius: 18px; }
  .category-list, .material-tier-list { grid-template-columns: 1fr; }
  .split-heading { align-items: start; flex-direction: column; }
  .nav-links a { padding-left: 0; }
}

/* Sprint #19 — extracted content, not metadata-only claims */
.extracted-content-panel {
  margin: 1.25rem 0;
  padding: clamp(1rem, 2.5vw, 1.4rem);
  border: 1px solid rgba(50, 79, 66, 0.14);
  border-radius: 24px;
  background: rgba(255, 252, 244, 0.78);
}

.content-status-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1rem 0;
}

.content-status-card {
  border: 1px solid rgba(50, 79, 66, 0.14);
  border-radius: 18px;
  padding: 0.85rem;
  background: rgba(255,255,255,0.72);
}

.content-status-card strong {
  display: block;
  font-size: 1.35rem;
  color: var(--ink);
}

.content-status-card span {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.extracted-content-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.extracted-content-card {
  border: 1px solid rgba(50, 79, 66, 0.14);
  border-radius: 22px;
  padding: 1rem;
  background: rgba(255,255,255,0.84);
}

.extracted-content-card h4 {
  margin: 0.25rem 0 0.5rem;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.extracted-content-card ul {
  margin: 0.75rem 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
}

.extracted-content-card li + li { margin-top: 0.35rem; }

.dark-theme .extracted-content-panel,
.dark-theme .content-status-card,
.dark-theme .extracted-content-card {
  background: rgba(18, 31, 27, 0.72);
  border-color: rgba(226, 213, 183, 0.18);
}

@media (max-width: 780px) {
  .content-status-grid,
  .extracted-content-list { grid-template-columns: 1fr; }
}