/* ===== Reset + tokens ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
:root {
  --bg: #0a0f1e;
  --bg-2: #0f172a;
  --bg-3: #111a32;
  --panel: rgba(255,255,255,0.04);
  --panel-strong: rgba(255,255,255,0.07);
  --border: rgba(148,163,184,0.18);
  --border-strong: rgba(148,163,184,0.32);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-mute: #64748b;
  --accent: #38bdf8;
  --accent-2: #a855f7;
  --ot-yes: #22c55e;
  --ot-adapted: #38bdf8;
  --ot-limited: #f59e0b;
  --ot-no: #64748b;
}
body {
  background:
    radial-gradient(1100px 600px at 12% -5%, rgba(168,85,247,0.18), transparent 60%),
    radial-gradient(1100px 600px at 110% 10%, rgba(56,189,248,0.16), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}
a { color: inherit; }

/* ===== Topbar ===== */
.topbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(10,15,30,0.72);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1400px; margin: 0 auto;
  padding: 14px 26px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
}
.brand {
  display: flex; align-items: baseline; gap: 10px;
  text-decoration: none;
  font-weight: 700;
}
.brand-mark {
  font-size: 26px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 24px rgba(56,189,248,0.5);
}
.brand-name { font-size: 19px; letter-spacing: 0.5px; }
.brand-tag { font-size: 12px; color: var(--text-mute); font-weight: 400; }

.tabs { display: flex; gap: 6px; justify-self: center; }
.tab {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s ease;
}
.tab:hover { color: var(--text); border-color: var(--border-strong); background: var(--panel-strong); }
.tab.active { color: var(--bg); background: var(--text); border-color: var(--text); }
.tab-action { font-family: inherit; }

.search-wrapper { position: relative; min-width: 320px; }
#search {
  width: 100%;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(15,23,42,0.7);
  color: var(--text);
  font: inherit;
  outline: none;
  transition: border-color .15s;
}
#search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(56,189,248,0.18); }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  max-height: 420px; overflow-y: auto;
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  display: none;
  z-index: 100;
}
.search-results.open { display: block; }
.search-result {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background .12s;
}
.search-result:last-child { border-bottom: none; }
.search-result:hover { background: var(--panel-strong); }
.search-result .sr-icon { font-size: 20px; }
.search-result .sr-acronym { font-weight: 700; }
.search-result .sr-name { color: var(--text-dim); font-size: 13px; }
.search-result .sr-cat { font-size: 11px; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.4px; }

/* ===== Layout ===== */
.container { max-width: 1400px; margin: 0 auto; padding: 36px 26px 60px; }

/* ===== Hero ===== */
.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 32px;
  margin-bottom: 36px;
  background: linear-gradient(135deg, rgba(168,85,247,0.10), rgba(56,189,248,0.06));
  border: 1px solid var(--border);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 200px at 80% 0%, rgba(168,85,247,0.18), transparent);
  pointer-events: none;
}
.hero-text h1 {
  font-size: 32px; line-height: 1.15; margin: 0 0 14px;
  background: linear-gradient(135deg, #fff, #cbd5e1);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-text p { color: var(--text-dim); margin: 0 0 20px; }
.hero-text strong { color: var(--text); }
.hero-actions { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.toggle {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13.5px; color: var(--text-dim); cursor: pointer;
  user-select: none;
}
.toggle input { width: 16px; height: 16px; accent-color: var(--accent); }

.hero-domains {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  position: relative; z-index: 1;
}
.domain-chip {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 22px 14px;
  background: rgba(15,23,42,0.7);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  color: inherit;
  cursor: pointer;
  font: inherit;
  transition: all .18s ease;
}
.domain-chip:hover {
  transform: translateY(-3px);
  border-color: var(--chip-glow, var(--accent));
  box-shadow: 0 14px 36px rgba(0,0,0,0.4), 0 0 24px rgba(253,230,138,0.18);
}
.domain-icon { font-size: 28px; }
.domain-acronym { font-weight: 700; font-size: 22px; letter-spacing: 1px; }
.domain-name { font-size: 12px; color: var(--text-mute); }

/* ===== Categories ===== */
.categories { display: grid; gap: 26px; }
.cat-block {
  border: 1px solid var(--border);
  border-left: 3px solid var(--cat-color);
  border-radius: 16px;
  background: var(--bg-2);
  padding: 24px 26px 26px;
  transition: border-color .15s, transform .15s;
}
.cat-block.dim { opacity: 0.35; }
.cat-head {
  display: grid; grid-template-columns: 1fr 1.8fr; gap: 24px;
  align-items: start;
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px dashed var(--border);
}
.cat-head h2 { margin: 0 0 6px; font-size: 14px; }
.cat-pill {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--cat-color) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--cat-color) 35%, transparent);
  color: var(--cat-color);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.cat-full { margin: 0; color: var(--text-dim); font-size: 16px; font-weight: 600; }
.cat-desc { margin: 0; color: var(--text-dim); font-size: 13.5px; line-height: 1.55; }

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.tech-card {
  position: relative;
  display: flex; flex-direction: column; gap: 6px;
  padding: 16px 16px 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-3);
  color: inherit;
  text-align: left;
  cursor: pointer;
  font: inherit;
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.tech-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--cat-color);
  border-radius: 12px 0 0 12px;
  opacity: 0.65;
}
.tech-card:hover {
  transform: translateY(-3px);
  border-color: var(--cat-color);
  box-shadow: 0 14px 32px rgba(0,0,0,0.4),
              0 0 0 1px color-mix(in srgb, var(--cat-color) 25%, transparent);
}
.tech-card.dim { opacity: 0.25; pointer-events: none; }
.tech-icon { font-size: 22px; }
.tech-acronym { font-weight: 700; font-size: 17px; letter-spacing: 0.5px; }
.tech-name { color: var(--text-dim); font-size: 12.5px; }
.tech-short {
  color: var(--text-mute);
  font-size: 12.5px;
  line-height: 1.4;
  margin-top: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tech-ot {
  align-self: flex-start;
  margin-top: 8px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  border: 1px solid currentColor;
}
.ot-yes, .ot-tag.ot-yes { color: var(--ot-yes); background: rgba(34,197,94,0.10); }
.ot-adapted, .ot-tag.ot-adapted { color: var(--ot-adapted); background: rgba(56,189,248,0.10); }
.ot-limited, .ot-tag.ot-limited { color: var(--ot-limited); background: rgba(245,158,11,0.10); }
.ot-no, .ot-tag.ot-no { color: var(--ot-no); background: rgba(100,116,139,0.10); }
.tech-ot-big { font-size: 12.5px; padding: 6px 14px; }

/* ===== Legend ===== */
.legend {
  margin-top: 36px;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-2);
}
.legend h3 { margin: 0 0 12px; font-size: 14px; color: var(--text-dim); }
.legend-row {
  display: grid; grid-template-columns: 130px 1fr; gap: 14px;
  align-items: center;
  padding: 5px 0;
  font-size: 13.5px;
  color: var(--text-dim);
}
.ot-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  text-align: center;
  border: 1px solid currentColor;
}

/* ===== Modal ===== */
.modal { position: fixed; inset: 0; z-index: 200; display: none; }
.modal.open { display: block; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(2, 6, 23, 0.78);
  backdrop-filter: blur(6px);
  animation: fadeIn .15s ease;
}
.modal-panel {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: min(900px, 92vw);
  max-height: 88vh;
  overflow-y: auto;
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  padding: 28px 32px 32px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
  animation: slideUp .18s ease;
}
.modal-close {
  position: sticky;
  top: 0;
  float: right;
  margin: -8px -10px 0 0;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--bg-3);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  z-index: 10;
}
@keyframes fadeIn { from {opacity: 0;} to {opacity: 1;} }
@keyframes slideUp {
  from { opacity: 0; transform: translate(-50%, -45%); }
  to   { opacity: 1; transform: translate(-50%, -50%); }
}

.modal-content .m-header {
  display: flex; gap: 16px; align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}
.modal-content .m-icon { font-size: 38px; line-height: 1; }
.modal-content .m-title-block { flex: 1; }
.modal-content .m-cat {
  display: inline-block; margin-bottom: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}
.modal-content h2 { margin: 0; font-size: 24px; }
.modal-content .m-fullname { color: var(--text-dim); margin: 4px 0 8px; font-size: 15px; }
.modal-content .m-short { margin: 0; color: var(--text); }

.m-section { margin: 20px 0 0; }
.m-section h3 {
  margin: 0 0 6px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-dim);
}
.m-section p { margin: 0; color: var(--text); line-height: 1.6; }
.m-section ul { margin: 6px 0 0; padding-left: 20px; }
.m-section li { margin: 4px 0; }

.m-vendors { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 6px 0 0; }
.m-vendors li {
  padding: 5px 11px;
  background: var(--panel-strong);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 12.5px;
}
.m-watch {
  margin-top: 22px;
  padding: 14px 16px;
  background: rgba(245,158,11,0.10);
  border: 1px solid rgba(245,158,11,0.32);
  border-radius: 12px;
}
.m-watch h3 { color: #fbbf24; }
.m-ot {
  margin-top: 22px;
  padding: 14px 16px;
  background: rgba(56,189,248,0.08);
  border: 1px solid rgba(56,189,248,0.28);
  border-radius: 12px;
}
.m-ot h3 { color: var(--accent); }

/* ===== Tech detail page ===== */
.tech-page { max-width: 880px; margin: 0 auto; }
.back-link {
  display: inline-block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13.5px;
  margin-bottom: 18px;
}
.back-link:hover { color: var(--text); }
.tech-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}
.tech-header-main { display: flex; gap: 18px; align-items: flex-start; }
.tech-page-icon { font-size: 46px; line-height: 1; }
.tech-cat {
  display: inline-block; margin: 0 0 4px;
  padding: 4px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--cat-color) 18%, transparent);
  color: var(--cat-color);
  font-size: 11px; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase;
}
.tech-header h1 { margin: 6px 0 8px; font-size: 32px; }
.tech-page-name { font-weight: 400; color: var(--text-dim); margin-left: 10px; font-size: 22px; }
.tech-block { margin: 22px 0; }
.tech-block h2 {
  font-size: 13px; text-transform: uppercase; letter-spacing: 0.6px;
  color: var(--cat-color); margin: 0 0 8px;
}
.vendor-list { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; }
.vendor-list li {
  padding: 5px 11px;
  background: var(--panel-strong);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 12.5px;
}
.tech-ot-block {
  padding: 16px 18px;
  background: rgba(56,189,248,0.06);
  border: 1px solid rgba(56,189,248,0.28);
  border-radius: 12px;
}
.tech-watch {
  padding: 16px 18px;
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.28);
  border-radius: 12px;
}
.tech-watch h2 { color: #fbbf24; }

/* ===== Quiz ===== */
.quiz { max-width: 820px; margin: 0 auto; }
.quiz-header { margin-bottom: 22px; }
.quiz-header h1 { font-size: 26px; margin: 0 0 14px; }
.quiz-modes {
  display: flex; flex-wrap: wrap; gap: 14px;
  margin-bottom: 16px;
  font-size: 13.5px;
  color: var(--text-dim);
}
.quiz-modes label {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
}
.quiz-modes input { accent-color: var(--accent); }
.quiz-score {
  display: flex; align-items: center; gap: 16px;
  font-size: 14px;
  color: var(--text-dim);
}
.quiz-score strong { color: var(--text); font-size: 18px; }
.quiz-streak { color: #fbbf24; font-weight: 600; }
.btn-mini {
  margin-left: auto;
  padding: 5px 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  font: inherit;
  font-size: 12.5px;
  cursor: pointer;
}
.btn-mini:hover { color: var(--text); }

.quiz-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px;
}
.quiz-cat {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  background: var(--panel-strong);
}
.quiz-prompt {
  margin: 0 0 8px;
  font-size: 26px;
  line-height: 1.25;
}
.quiz-context { color: var(--text-dim); margin: 0 0 24px; }
.quiz-choices { display: grid; gap: 10px; }
.quiz-choice {
  padding: 14px 18px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: all .12s;
}
.quiz-choice:hover { border-color: var(--accent); background: var(--panel-strong); }
.quiz-choice.correct {
  border-color: var(--ot-yes);
  background: rgba(34,197,94,0.14);
}
.quiz-choice.wrong {
  border-color: #ef4444;
  background: rgba(239,68,68,0.14);
}
.quiz-choice.reveal {
  border-color: var(--ot-yes);
  outline: 2px dashed rgba(34,197,94,0.55);
}
.quiz-feedback { min-height: 24px; margin-top: 16px; color: var(--text-dim); font-size: 14px; }
.btn-next {
  margin-top: 18px;
  padding: 11px 22px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 10px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn-next:hover { filter: brightness(1.1); }

/* ===== Diagrams ===== */
.tech-diagram {
  margin-top: 8px;
  padding: 14px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow-x: auto;
}
.diagram-svg {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  margin: 0 auto;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
.diagram-section { margin-top: 20px; }
.tech-diagram-block .tech-diagram { margin-top: 4px; }
@media (max-width: 640px) {
  .tech-diagram { padding: 8px; }
}

/* ===== Footer ===== */
.footer {
  max-width: 1400px; margin: 40px auto 0;
  padding: 18px 26px;
  display: flex; justify-content: space-between;
  color: var(--text-mute);
  font-size: 12px;
  border-top: 1px solid var(--border);
}

/* ===== Responsive ===== */
@media (max-width: 1000px) {
  .topbar-inner { grid-template-columns: 1fr 1fr; row-gap: 12px; }
  .search-wrapper { grid-column: 1/-1; min-width: 0; }
  .hero { grid-template-columns: 1fr; }
  .cat-head { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .tabs { justify-self: start; }
  .container { padding: 22px 16px 40px; }
  .hero { padding: 22px; }
  .hero-text h1 { font-size: 24px; }
  .tech-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .modal-panel { padding: 20px; }
  .modal-content h2 { font-size: 20px; }
  .quiz-card { padding: 22px; }
  .quiz-prompt { font-size: 20px; }
  .tech-header h1 { font-size: 24px; }
  .tech-page-name { display: block; margin-left: 0; font-size: 17px; }
}