:root {
  --paper: #f4efe4;
  --paper-2: #fffaf0;
  --ink: #172235;
  --muted: #616a76;
  --line: #d8cdb9;
  --navy: #17395c;
  --navy-soft: #e5edf4;
  --teal: #16736b;
  --teal-soft: #dff1ed;
  --amber: #985200;
  --amber-soft: #f8ead2;
  --red: #a63e35;
  --red-soft: #f5dfdc;
  --green: #3c7b4a;
  --green-soft: #e2f0e4;
  --shadow: 0 18px 55px rgba(50, 39, 24, .10);
  --radius: 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #111923;
    --paper-2: #182331;
    --ink: #edf2f7;
    --muted: #b5c0cc;
    --line: #344254;
    --navy: #8fc1ec;
    --navy-soft: #1e3448;
    --teal: #77d6ca;
    --teal-soft: #183b3a;
    --amber: #f2bd74;
    --amber-soft: #422f19;
    --red: #f09c92;
    --red-soft: #442727;
    --green: #9bd6a6;
    --green-soft: #203d2a;
    --shadow: 0 18px 55px rgba(0, 0, 0, .28);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% -8%, rgba(22, 115, 107, .13), transparent 32rem),
    radial-gradient(circle at 96% 6%, rgba(152, 82, 0, .10), transparent 29rem),
    var(--paper);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

a { color: var(--navy); text-underline-offset: 3px; }
button, input, select, textarea { font: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
}
.shell { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.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;
}

.topbar {
  border-bottom: 1px solid color-mix(in srgb, var(--line) 76%, transparent);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(14px);
}
.topbar-inner {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: .88rem; }
.crumbs a { font-weight: 760; text-decoration: none; }
.crumbs span { color: var(--muted); }
.preview-label {
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .04em;
  white-space: nowrap;
}

.hero { padding: 56px 0 42px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(290px, .65fr); gap: 34px; align-items: end; }
.kicker, .eyebrow {
  color: var(--teal);
  font-size: .78rem;
  font-weight: 850;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.kicker { display: flex; align-items: center; gap: 9px; }
.kicker::before { content: ""; width: 24px; height: 2px; background: currentColor; }
h1, h2, h3 { margin-top: 0; line-height: 1.24; letter-spacing: -.025em; }
h1, h2 { font-family: ui-serif, Georgia, "Songti SC", serif; }
h1 { margin: 15px 0 17px; font-size: clamp(2.55rem, 6.5vw, 5.2rem); font-weight: 650; }
h2 { margin-bottom: 15px; font-size: clamp(1.75rem, 3.7vw, 2.8rem); }
h3 { margin-bottom: 9px; font-size: 1.16rem; }
p { margin: 0 0 1em; }
.lede { max-width: 790px; color: var(--muted); font-size: clamp(1.03rem, 2vw, 1.22rem); }
.hero-actions, .link-row, .note-actions { display: flex; flex-wrap: wrap; gap: 9px; }
.hero-actions { margin-top: 23px; }
.button, .resource-link, .filter-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper-2) 94%, transparent);
  font-weight: 760;
  text-decoration: none;
  cursor: pointer;
}
.button.primary { border-color: transparent; color: #fff; background: var(--teal); }
.button.subtle { color: var(--muted); background: transparent; }
.button.danger { color: var(--red); }
.button:hover, .resource-link:hover, .filter-button:hover { border-color: var(--teal); background: var(--teal-soft); }

.scope-card, .control-panel, .paper-card, .detail-card, .note-panel, .path-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--paper-2) 94%, transparent);
  box-shadow: 0 8px 26px rgba(45, 36, 23, .05);
}
.scope-card { padding: 23px; box-shadow: var(--shadow); }
.scope-card strong { display: block; margin-bottom: 8px; color: var(--teal); }
.scope-card p { color: var(--muted); font-size: .92rem; }
.scope-card p:last-child { margin-bottom: 0; }
.scope-stat { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 17px 0; }
.scope-stat div { padding: 12px; border-radius: 12px; background: var(--navy-soft); }
.scope-stat b, .scope-stat span { display: block; }
.scope-stat b { color: var(--navy); font-size: 1.35rem; }
.scope-stat span { color: var(--muted); font-size: .78rem; }

main { padding-bottom: 74px; }
.control-panel { position: sticky; top: 10px; z-index: 8; padding: 18px; box-shadow: var(--shadow); }
.control-grid { display: grid; grid-template-columns: minmax(260px, 1fr) 210px; gap: 13px; }
.field label { display: block; margin-bottom: 6px; color: var(--muted); font-size: .8rem; font-weight: 800; }
.field input, .field select, .note-panel textarea, .note-panel select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: var(--paper);
}
.field input, .field select, .note-panel select { padding: 10px 12px; }
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.filter-button { min-height: 38px; padding: 7px 12px; color: var(--muted); font-size: .84rem; }
.filter-button[aria-pressed="true"] { border-color: var(--teal); color: var(--teal); background: var(--teal-soft); }
.result-line { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 18px 2px 0; color: var(--muted); font-size: .88rem; }

.year-block { margin-top: 42px; }
.year-heading { display: flex; align-items: baseline; gap: 12px; margin-bottom: 15px; }
.year-heading h2 { margin: 0; font-size: clamp(1.55rem, 3vw, 2.15rem); }
.year-heading span { color: var(--muted); font-size: .84rem; }
.paper-list { display: grid; gap: 14px; }
.paper-card { display: grid; grid-template-columns: 145px minmax(0, 1fr); gap: 22px; padding: 22px; }
.paper-card[hidden], .year-block[hidden] { display: none; }
.paper-date { color: var(--amber); font-weight: 850; }
.paper-date small { display: block; margin-top: 4px; color: var(--muted); font-weight: 600; }
.paper-meta { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 9px; }
.tag, .reading-status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 3px 8px;
  border-radius: 999px;
  color: var(--muted);
  background: var(--navy-soft);
  font-size: .73rem;
  font-weight: 800;
}
.tag.priority { color: var(--teal); background: var(--teal-soft); }
.tag.boundary { color: var(--amber); background: var(--amber-soft); }
.tag.technical-count { color: var(--amber); background: var(--amber-soft); }
.reading-status[data-status="reading"] { color: var(--amber); background: var(--amber-soft); }
.reading-status[data-status="read"], .reading-status[data-status="absorbed"] { color: var(--green); background: var(--green-soft); }
.paper-card h3 { margin-bottom: 6px; font-family: ui-serif, Georgia, "Songti SC", serif; font-size: clamp(1.2rem, 2.3vw, 1.55rem); }
.authors, .venue, .card-copy { color: var(--muted); }
.authors, .venue { font-size: .88rem; }
.venue { margin-bottom: 12px; }
.card-copy { max-width: 880px; }
.card-copy strong { color: var(--ink); }
.resource-link { min-height: 38px; padding: 7px 11px; font-size: .82rem; }
.resource-link.internal { border-color: color-mix(in srgb, var(--teal) 42%, var(--line)); color: var(--teal); }
.zero-state { margin-top: 34px; padding: 26px; border: 1px dashed var(--line); border-radius: var(--radius); color: var(--muted); text-align: center; }

.detail-hero { padding: 42px 0 30px; }
.detail-hero h1 { max-width: 980px; font-size: clamp(2.15rem, 5.7vw, 4.35rem); }
.bibliography-line { max-width: 930px; color: var(--muted); }
.detail-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 22px; align-items: start; }
.detail-main { min-width: 0; }
.detail-card { margin-bottom: 16px; padding: 24px; }
.detail-card h2 { font-family: inherit; font-size: 1.3rem; }
.detail-card p:last-child { margin-bottom: 0; }
.detail-card.boundary-card { border-color: color-mix(in srgb, var(--amber) 44%, var(--line)); background: color-mix(in srgb, var(--amber-soft) 58%, var(--paper-2)); }
.detail-card ul, .detail-card ol { margin: 0; padding-left: 1.3em; }
.detail-card li + li { margin-top: 8px; }
.section-note { color: var(--muted); }
.technical-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 16px; }
.technical-card {
  display: block;
  min-width: 0;
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--teal) 42%, var(--line));
  border-radius: 14px;
  color: var(--ink);
  background: color-mix(in srgb, var(--teal-soft) 42%, var(--paper-2));
  text-decoration: none;
}
.technical-card:hover { border-color: var(--teal); transform: translateY(-1px); }
.technical-card span { color: var(--teal); font-size: .73rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.technical-card h3 { margin: 7px 0; font-family: ui-serif, Georgia, "Songti SC", serif; }
.technical-card p { color: var(--muted); font-size: .9rem; }
.technical-card b { color: var(--teal); font-size: .86rem; }
.technical-empty { padding: 16px 18px; border: 1px dashed var(--line); border-radius: 14px; color: var(--muted); }
.technical-empty strong { color: var(--ink); }
.technical-empty p { margin: 5px 0 0; }
.side-stack { position: sticky; top: 18px; display: grid; gap: 14px; }
.path-card { padding: 19px; }
.path-card h2 { margin-bottom: 11px; font-family: inherit; font-size: 1rem; }
.path-card dl { margin: 0; }
.path-card dt { margin-top: 11px; color: var(--muted); font-size: .72rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.path-card dd { margin: 3px 0 0; overflow-wrap: anywhere; font-size: .88rem; }
.path-card code { font-size: .78rem; }

.note-panel { margin-top: 22px; padding: 24px; box-shadow: var(--shadow); }
.note-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.note-head h2 { margin-bottom: 7px; }
.note-head p { max-width: 780px; color: var(--muted); }
.note-status { flex: 0 0 190px; }
.note-status label { display: block; margin-bottom: 6px; color: var(--muted); font-size: .8rem; font-weight: 800; }
.note-panel textarea { min-height: 360px; margin: 14px 0; padding: 15px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 16px; line-height: 1.55; }
.note-feedback { min-height: 1.7em; margin: 10px 0 0; color: var(--muted); font-size: .86rem; }
.note-feedback[data-state="ok"] { color: var(--green); }
.note-feedback[data-state="error"] { color: var(--red); }
.privacy-note { margin-top: 15px; padding: 13px 15px; border-left: 4px solid var(--amber); color: var(--muted); background: var(--amber-soft); font-size: .87rem; }
.pager { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-top: 22px; }
.pager a { min-width: 0; padding: 13px 14px; border: 1px solid var(--line); border-radius: 13px; background: var(--paper-2); text-decoration: none; }
.pager a:nth-child(2) { text-align: center; }
.pager a:last-child { text-align: right; }
.pager span { display: block; color: var(--muted); font-size: .72rem; font-weight: 800; }

footer { padding: 30px 0 42px; border-top: 1px solid var(--line); background: color-mix(in srgb, var(--paper-2) 55%, transparent); }
.footer-grid { display: flex; align-items: flex-start; justify-content: space-between; gap: 22px; }
.footer-grid p { margin: 4px 0 0; color: var(--muted); font-size: .86rem; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 13px; }

@media (prefers-color-scheme: dark) {
  .button.primary { color: #102019; }
}

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

@media (max-width: 900px) {
  .hero-grid, .detail-layout { grid-template-columns: 1fr; }
  .side-stack, .control-panel { position: static; }
  .paper-card { grid-template-columns: 120px minmax(0, 1fr); }
}

@media (max-width: 680px) {
  .shell { width: min(calc(100% - 24px), 1160px); }
  .topbar-inner, .footer-grid, .note-head { align-items: stretch; flex-direction: column; }
  .preview-label { align-self: flex-start; white-space: normal; }
  .hero { padding: 34px 0 30px; }
  h1 { font-size: clamp(2.25rem, 13vw, 3.5rem); }
  .hero-actions .button, .note-actions .button { width: 100%; }
  .control-grid, .paper-card, .pager, .technical-grid { grid-template-columns: 1fr; }
  .control-panel, .paper-card, .detail-card, .note-panel { padding: 17px; }
  .paper-date { display: flex; align-items: baseline; gap: 9px; }
  .paper-date small { display: inline; margin: 0; }
  .note-status { flex-basis: auto; }
  .pager a, .pager a:nth-child(2), .pager a:last-child { text-align: left; }
  .footer-links { justify-content: flex-start; }
}