:root { color-scheme: dark; }
* { margin:0; padding:0; box-sizing:border-box; }

body {
  min-height: 100vh;
  background: #04040e;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: rgba(255,255,255,0.85);
  overflow-x: hidden;
}

.bg-layer {
  position: fixed; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 70% 50% at 15% 20%, rgba(99,102,241,0.14) 0%, transparent 65%),
    radial-gradient(ellipse 55% 45% at 85% 80%, rgba(34,211,238,0.11) 0%, transparent 65%),
    radial-gradient(ellipse 45% 40% at 50% 95%, rgba(168,85,247,0.09) 0%, transparent 65%),
    #04040e;
}

.orb {
  position: fixed; border-radius: 50%;
  filter: blur(90px); pointer-events: none;
  animation: orbFloat 14s ease-in-out infinite;
  z-index: 0;
}
@keyframes orbFloat {
  0%,100% { transform: translate(0,0) scale(1); }
  40%      { transform: translate(20px,-30px) scale(1.05); }
  70%      { transform: translate(-15px,20px) scale(0.96); }
}

.page {
  position: relative; z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 28px 48px;
}

/* ── Back button ── */
.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.05em;
  color: rgba(255,255,255,0.45);
  text-decoration: none; padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 20px;
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(8px);
  transition: all 0.2s;
  margin-bottom: 20px; display: inline-flex;
}
.back-btn:hover { color: rgba(255,255,255,0.80); border-color: rgba(255,255,255,0.20); background: rgba(255,255,255,0.08); }

/* ── Module header ── */
.mod-header {
  display: flex; align-items: center; gap: 18px;
  margin: 6px 0 18px;
}
.mod-icon {
  width: 58px; height: 58px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; flex-shrink: 0;
  box-shadow: 0 4px 20px rgba(0,0,0,0.45);
  border: 1px solid rgba(255,255,255,0.18);
}
.mod-title {
  font-size: 22px; font-weight: 800; letter-spacing: -0.01em;
  color: rgba(255,255,255,0.92);
}
.mod-file {
  font-size: 11px; color: rgba(255,255,255,0.38);
  font-family: 'SF Mono', 'Fira Code', monospace;
  margin-top: 3px;
}
.mod-badge {
  margin-left: auto; padding: 4px 14px;
  border-radius: 20px; border: 1px solid;
  font-size: 10.5px; font-weight: 600; letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ── Description ── */
.mod-desc {
  font-size: 13px; line-height: 1.7; color: rgba(255,255,255,0.52);
  margin-bottom: 24px;
  padding: 14px 18px;
  border-left: 2px solid rgba(255,255,255,0.10);
  background: rgba(255,255,255,0.025);
  border-radius: 0 10px 10px 0;
}
.mod-desc code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 11.5px; color: rgba(200,180,255,0.80);
  background: rgba(255,255,255,0.07);
  padding: 1px 5px; border-radius: 4px;
}

/* ── Sequence wrap ── */
.seq-wrap {
  background: rgba(255,255,255,0.025);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 16px;
  padding: 20px 12px;
  margin-bottom: 24px;
  overflow-x: auto;
}

/* ── Info grid ── */
.info-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}
.info-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px; padding: 16px 18px;
  backdrop-filter: blur(10px);
}
.info-title {
  font-size: 10.5px; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: rgba(255,255,255,0.35);
  margin-bottom: 10px;
}
.info-row {
  font-size: 12px; color: rgba(255,255,255,0.60);
  padding: 5px 0; border-bottom: 1px solid rgba(255,255,255,0.05);
  display: flex; align-items: center; gap: 8px;
}
.info-row:last-child { border-bottom: none; }

/* ── Tags ── */
.tag {
  display: inline-block; font-size: 9px; font-weight: 700;
  letter-spacing: 0.04em; padding: 2px 7px; border-radius: 10px;
  font-family: 'SF Mono', monospace; white-space: nowrap;
}
.tag.cyan   { background: rgba(34,211,238,0.15); color: #67e8f9; }
.tag.purple { background: rgba(167,139,250,0.15); color: #c4b5fd; }
.tag.amber  { background: rgba(251,191,36,0.15);  color: #fcd34d; }
.tag.rose   { background: rgba(251,113,133,0.15); color: #fda4af; }
.tag.green  { background: rgba(34,197,94,0.15);   color: #86efac; }
.tag.indigo { background: rgba(99,102,241,0.15);  color: #a5b4fc; }
.tag.orange { background: rgba(251,146,60,0.15);  color: #fdba74; }
.tag.pink   { background: rgba(244,114,182,0.15); color: #f9a8d4; }


/* ══════════════════════════════════════════════════════════════════════════
   LIGHT THEME  ·  data-theme="light"
   Palette: White / Slate bg · Blue #2563eb · Red #dc2626 · Orange #ea580c
══════════════════════════════════════════════════════════════════════════ */

[data-theme="light"] { color-scheme: light; }

[data-theme="light"] body {
  background: #f0f4f8;
  color: #1e293b;
}

[data-theme="light"] .bg-layer {
  background:
    radial-gradient(ellipse 70% 50% at 15% 20%, rgba(37,99,235,0.07)  0%, transparent 65%),
    radial-gradient(ellipse 55% 45% at 85% 80%, rgba(234,88,12,0.06)  0%, transparent 65%),
    radial-gradient(ellipse 45% 40% at 50% 95%, rgba(220,38,38,0.05)  0%, transparent 65%),
    #f0f4f8;
}

[data-theme="light"] .orb {
  filter: blur(90px) opacity(0.45);
}

/* ── Back button ── */
[data-theme="light"] .back-btn {
  color: #475569;
  border-color: rgba(0,0,0,0.12);
  background: rgba(255,255,255,0.85);
}
[data-theme="light"] .back-btn:hover {
  color: #1e293b;
  border-color: rgba(37,99,235,0.40);
  background: #ffffff;
}

/* ── Module header ── */
[data-theme="light"] .mod-icon {
  border-color: rgba(255,255,255,0.55);
  box-shadow: 0 4px 16px rgba(0,0,0,0.14);
}
[data-theme="light"] .mod-title { color: #0f172a; }
[data-theme="light"] .mod-file  { color: #64748b; }

/* ── Description ── */
[data-theme="light"] .mod-desc {
  color: #334155;
  border-left-color: rgba(37,99,235,0.35);
  background: rgba(37,99,235,0.04);
}
[data-theme="light"] .mod-desc code {
  color: #2563eb;
  background: rgba(37,99,235,0.08);
}

/* ── Sequence diagram wrapper ── */
[data-theme="light"] .seq-wrap {
  background: #ffffff;
  border-color: rgba(0,0,0,0.08);
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

/* ── Info cards ── */
[data-theme="light"] .info-card {
  background: #ffffff;
  border-color: rgba(0,0,0,0.09);
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  backdrop-filter: none;
}
[data-theme="light"] .info-title { color: #64748b; }
[data-theme="light"] .info-row   {
  color: #334155;
  border-bottom-color: rgba(0,0,0,0.06);
}

/* ── Tags – darker text on white bg ── */
[data-theme="light"] .tag.cyan   { background: rgba(8,145,178,0.10);  color: #0e7490; }
[data-theme="light"] .tag.purple { background: rgba(109,40,217,0.10); color: #6d28d9; }
[data-theme="light"] .tag.amber  { background: rgba(180,83,9,0.10);   color: #b45309; }
[data-theme="light"] .tag.rose   { background: rgba(190,18,60,0.10);  color: #be123c; }
[data-theme="light"] .tag.green  { background: rgba(5,150,105,0.10);  color: #047857; }
[data-theme="light"] .tag.indigo { background: rgba(67,56,202,0.10);  color: #4338ca; }
[data-theme="light"] .tag.orange { background: rgba(194,65,12,0.10);  color: #c2410c; }
[data-theme="light"] .tag.pink   { background: rgba(157,23,77,0.10);  color: #9d174d; }

/* ── Sequence diagram SVG overrides (light theme) ──────────────────────── */
/* renderer.js adds CSS classes to key SVG elements for theming             */

[data-theme="light"] .seq-wrap .seq-bg {
  fill: rgba(248,250,252,0.70);
}
[data-theme="light"] .seq-wrap .seq-bg-border {
  stroke: rgba(0,0,0,0.07);
}
[data-theme="light"] .seq-wrap .seq-sep-band {
  fill: rgba(0,0,0,0.035);
  stroke: rgba(0,0,0,0.08);
}
[data-theme="light"] .seq-wrap .seq-sep-text {
  fill: rgba(0,0,0,0.42);
}
[data-theme="light"] .seq-wrap .seq-step-circle {
  fill: rgba(0,0,0,0.04);
}
[data-theme="light"] .seq-wrap .seq-step-num {
  fill: rgba(0,0,0,0.40);
}
[data-theme="light"] .seq-wrap .seq-msg-bg {
  fill: rgba(255,255,255,0.88);
}
[data-theme="light"] .seq-wrap .seq-msg-label {
  fill: #1e293b;
}
[data-theme="light"] .seq-wrap .seq-note-bg {
  fill: rgba(180,83,9,0.07);
  stroke: rgba(180,83,9,0.28);
}
[data-theme="light"] .seq-wrap .seq-note-text {
  fill: #b45309;
}