:root {
  --bg: #071b2f;
  --bg-2: #0a243b;
  --panel: rgba(8, 35, 58, 0.78);
  --panel-strong: rgba(7, 28, 48, 0.94);
  --line: rgba(114, 219, 255, 0.2);
  --text: #f4fbff;
  --muted: #a9c3d5;
  --cyan: #55d8ff;
  --green: #9bb85f;
  --magenta: #ff4fa3;
  --orange: #ffb05c;
  --purple: #b892ff;
  --blue: #67a8ff;
  --gold: #ffd166;
  --radius: 24px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body {
  min-height: 100%;
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(85, 216, 255, 0.18), transparent 34rem),
    radial-gradient(circle at bottom right, rgba(255, 79, 163, 0.13), transparent 32rem),
    linear-gradient(140deg, #051626 0%, #071b2f 48%, #0b2740 100%);
}

.page-shell { width: min(1440px, calc(100% - 40px)); margin: 0 auto; padding: 46px 0; }
.hero {
  display: block; margin-bottom: 28px;
}
h1 { margin: 0; color: var(--cyan); font-size: clamp(2.3rem, 6vw, 5.2rem); line-height: .9; letter-spacing: -.055em; }
.subtitle { max-width: 740px; margin: 18px 0 0; color: var(--muted); font-size: clamp(1rem, 2vw, 1.25rem); line-height: 1.45; }

.toolbox {
  display: grid;
  grid-template-columns: 280px minmax(360px, 1fr) 390px;
  gap: 20px;
  align-items: start;
}
.control-panel, .detail-panel, .figure-grid-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.control-panel { padding: 20px; position: sticky; top: 20px; }
.search-label { display: block; margin-bottom: 9px; color: var(--cyan); text-transform: uppercase; letter-spacing: .12em; font-size: .74rem; font-weight: 800; }
#searchInput {
  width: 100%;
  border: 1px solid rgba(85, 216, 255, .32);
  background: rgba(3, 17, 31, .72);
  color: var(--text);
  border-radius: 15px;
  padding: 13px 14px;
  outline: none;
  font-size: .98rem;
}
#searchInput:focus { border-color: var(--cyan); box-shadow: 0 0 0 4px rgba(85, 216, 255, .12); }
.filter-group { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 18px; }
.filter-chip {
  cursor: pointer;
  border: 1px solid rgba(255,255,255,.14);
  color: #d7eaf4;
  background: rgba(255,255,255,.05);
  border-radius: 999px;
  padding: 9px 11px;
  font-weight: 700;
  font-size: .82rem;
}
.filter-chip:hover, .filter-chip.active { border-color: var(--cyan); color: var(--cyan); background: rgba(85,216,255,.1); }
.stats-card { margin-top: 22px; padding: 16px; border-radius: 18px; background: rgba(155,184,95,.11); border: 1px solid rgba(155,184,95,.28); }
.stats-card strong { display:block; font-size: 2.2rem; color: var(--green); line-height: 1; }
.stats-card span { color: var(--muted); font-size: .9rem; }

.figure-grid-wrap { min-height: 720px; padding: 18px; }
.figure-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.figure-card {
  min-height: 118px;
  text-align: left;
  border: 1px solid rgba(255,255,255,.12);
  border-left: 4px solid var(--card-color, var(--cyan));
  background: linear-gradient(145deg, rgba(255,255,255,.075), rgba(255,255,255,.03));
  color: var(--text);
  border-radius: 18px;
  padding: 14px;
  cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, background .18s ease, box-shadow .18s ease;
}
.figure-card:hover { transform: translateY(-2px); border-color: rgba(85,216,255,.35); box-shadow: 0 12px 28px rgba(0,0,0,.22); }
.figure-card.active { background: rgba(85,216,255,.11); border-color: var(--card-color, var(--cyan)); box-shadow: 0 0 0 3px rgba(85,216,255,.08); }
.figure-card h3 { margin: 0 0 8px; font-size: 1rem; line-height: 1.12; color: #fff; }
.figure-card p { margin: 0; color: var(--muted); font-size: .86rem; line-height: 1.35; }
.figure-card .category-pill { display: inline-block; margin-top: 12px; color: var(--card-color, var(--cyan)); font-size: .68rem; text-transform: uppercase; letter-spacing: .1em; font-weight: 900; }

.detail-panel { padding: 24px; position: sticky; top: 20px; overflow: hidden; }
.detail-accent { height: 6px; width: 110px; border-radius: 999px; background: var(--cyan); margin-bottom: 20px; box-shadow: 0 0 28px rgba(85,216,255,.4); }
.detail-category { margin: 0 0 8px; color: var(--magenta); text-transform: uppercase; letter-spacing: .14em; font-size: .76rem; font-weight: 900; }
.detail-panel h2 { margin: 0 0 12px; font-size: clamp(1.9rem, 3vw, 3rem); line-height: .95; color: #fff; letter-spacing: -.04em; }
.detail-description { color: #d7ecf7; font-size: 1.08rem; line-height: 1.45; margin: 0 0 22px; }
.detail-block { border-top: 1px solid rgba(255,255,255,.11); padding-top: 17px; margin-top: 17px; }
.detail-block h3 { color: var(--cyan); margin: 0 0 8px; font-size: .78rem; text-transform: uppercase; letter-spacing: .15em; }
.detail-block p { margin: 0; color: var(--muted); line-height: 1.5; }
blockquote { margin: 0; color: #fff; font-size: 1.22rem; line-height: 1.35; font-weight: 700; }
.example-block { background: rgba(255,255,255,.045); border: 1px solid rgba(255,255,255,.09); border-radius: 18px; padding: 17px; }

.empty-state { color: var(--muted); grid-column: 1/-1; padding: 28px; text-align: center; border: 1px dashed rgba(255,255,255,.2); border-radius: 18px; }
.fade-in { animation: fadeIn .22s ease both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 1100px) {
  .toolbox { grid-template-columns: 1fr; }
  .control-panel, .detail-panel { position: static; }
  .figure-grid-wrap { min-height: auto; }
}
@media (max-width: 620px) {
  .page-shell { width: min(100% - 24px, 1440px); padding: 28px 0; }
  .figure-grid { grid-template-columns: 1fr; }
  .control-panel, .detail-panel, .figure-grid-wrap { border-radius: 18px; }
}