/* 思想星图 · Thinking Star Map
   Typography, pill buttons and gold accent follow dialatan.github.io;
   the page itself is set at night. */

* { box-sizing: border-box; }

:root {
  --muted: #a8a397;
  --line: rgba(246, 243, 236, 0.28);
  --panel: rgba(16, 21, 42, 0.92);
  /* Fallback until starmap.js measures the real header. Large enough to avoid overlap. */
  --header-h: 220px;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

html {
  background: var(--night);
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  background: var(--night);
  color: var(--paper);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  animation: enter 0.75s ease both;
}

@keyframes enter {
  from { opacity: 0; }
  to { opacity: 1; }
}

#sky {
  position: fixed;
  inset: 0;
  touch-action: manipulation;
}

#sky canvas { display: block; }

/* ---------- top bar ---------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  padding: clamp(18px, 3vw, 34px) clamp(18px, 4vw, 56px) 16px;
  pointer-events: none;
}

.topbar > * { pointer-events: auto; }

.home-link {
  display: inline-flex;
  margin: 0 0 12px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.home-link:hover { color: var(--paper); }

.home-link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-label {
  margin: 0 0 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.16em;
}

.site-label::before {
  content: "";
  display: inline-block;
  width: 0.45em;
  height: 0.45em;
  margin-right: 0.55em;
  background: var(--gold);
  border-radius: 50%;
  transform: translateY(-0.05em);
}

.brand h1 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0;
  max-width: 380px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.tabs {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(12, 17, 36, 0.55);
}

.tabs button,
.pill {
  min-height: 40px;
  padding: 0 18px;
  color: var(--paper);
  background: transparent;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-family: var(--mono);
  font-size: 13px;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease, border-color 180ms ease;
}

.tabs button[aria-selected="true"] {
  color: var(--ink);
  background: var(--paper);
}

.pill {
  border: 1px solid var(--line);
  background: rgba(12, 17, 36, 0.55);
}

.pill:hover,
.tabs button[aria-selected="false"]:hover {
  border-color: var(--paper);
  transform: translateY(-1px);
}

.pill.lang { min-width: 48px; padding: 0 14px; }

button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.hint {
  position: fixed;
  left: 50%;
  bottom: clamp(14px, 3vh, 28px);
  transform: translateX(-50%);
  z-index: 15;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  pointer-events: none;
}

body.view-qa .hint { display: none; }

/* ---------- concept card ---------- */
.card {
  position: fixed;
  z-index: 30;
  width: min(340px, calc(100vw - 32px));
  padding: 20px 22px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent, var(--gold));
  border-radius: 14px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  animation: rise 200ms ease;
}

.card[hidden] { display: none; }

@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

.card-writer {
  margin: 0 0 6px;
  color: var(--accent, var(--gold));
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.card h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 500;
  line-height: 1.3;
}

.card-sub {
  margin: 2px 0 12px;
  color: var(--muted);
  font-size: 13px;
}

.card-summary {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #e7e2d6;
}

.card-quote {
  margin: 14px 0 0;
  padding: 10px 0 0 12px;
  border-left: 2px solid var(--accent, var(--gold));
}

.card-quote[hidden] { display: none; }

.card-quote blockquote {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.card-quote blockquote::before { content: "「"; }
.card-quote blockquote::after  { content: "」"; }

.card-quote figcaption {
  margin-top: 6px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
}

.card-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 36px;
  height: 36px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 50%;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}

.card-close:hover { color: var(--paper); background: rgba(255, 255, 255, 0.06); }

/* ---------- Q&A view ---------- */
/* Scrollport starts below the fixed header so cards never slide underneath it. */
.qa-view {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  top: var(--header-h);
  z-index: 10;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 22px clamp(18px, 4vw, 56px) 72px;
  background: color-mix(in srgb, var(--night) 80%, transparent);
}

body.view-qa .topbar {
  background: color-mix(in srgb, var(--night) 96%, transparent);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(244, 239, 228, 0.14);
}

.qa-view[hidden] { display: none; }

.qa-intro {
  max-width: 760px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.qa-block { margin: 0 0 40px; }

.qa-block h2 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.qa-block h2 span {
  margin-right: 10px;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
}

.qa-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.qa-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 14px;
  text-align: left;
  color: var(--paper);
  background: rgba(16, 21, 42, 0.86);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: 12px;
  font: inherit;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.qa-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  border-color: var(--accent);
}

.qa-card.no-star { cursor: default; }
.qa-card.no-star:hover { transform: none; box-shadow: none; border-color: var(--line); }

.qa-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
}

.qa-name::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

.qa-infer {
  display: block;
  margin-bottom: 2px;
  color: var(--accent);
  font-style: italic;
  font-size: 12.5px;
  opacity: 0.9;
}

.qa-card.inferred { border-style: dashed; border-top-style: solid; }

.qa-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: #e7e2d6;
}

.qa-link {
  margin-top: auto;
  padding-top: 4px;
  color: var(--accent);
  font-size: 12px;
}

/* ---------- About ---------- */
.about-backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(5, 8, 18, 0.6);
}

.about-backdrop[hidden] { display: none; }

.about-panel {
  position: relative;
  width: min(520px, 100%);
  max-height: calc(100dvh - 40px);
  overflow-y: auto;
  padding: 26px 26px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}

.about-panel h2 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
}

.about-panel p:not(.site-label) {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: #e7e2d6;
}

.about-panel p.credit {
  margin-top: 16px;
  color: var(--gold);
  font-size: 13px;
}

.l-short { display: none; }

.noscript { position: fixed; top: 45%; width: 100%; text-align: center; }

/* ---------- narrow screens ---------- */
@media (max-width: 760px) {
  .topbar {
    flex-direction: column;
    gap: 12px;
    padding: 16px 16px 14px;
  }
  .home-link { margin-bottom: 8px; }
  .site-label { margin-bottom: 6px; font-size: 10px; }
  .brand h1 { font-size: 24px; margin-bottom: 0; }
  .subtitle { display: none; }
  .l-full { display: none; }
  .l-short { display: inline; }
  .controls { justify-content: flex-start; gap: 8px; }
  .tabs button, .pill { min-height: 36px; padding: 0 12px; font-size: 13px; }
  .pill.lang { min-width: 40px; padding: 0 10px; }

  /* card becomes a bottom sheet */
  .card {
    left: 12px !important;
    right: 12px;
    top: auto !important;
    bottom: 12px;
    width: auto;
    max-height: 56vh;
    overflow-y: auto;
  }

  .qa-grid { grid-template-columns: 1fr; gap: 10px; }
  .hint { bottom: 10px; }
}

@media (min-width: 761px) and (max-width: 1100px) {
  .qa-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}