:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --ink: #1e293b;
  --ink-soft: #64748b;
  --ink-faint: #94a3b8;
  --border: #e2e8f0;
  --primary: #2563eb;
  --primary-tint: #eff6ff;
  --secondary: #10b981;
  --secondary-tint: #ecfdf5;
  --error: #ba1a1a;
  --error-tint: #ffdad6;
  --shadow-1: none;
  --shadow-2: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-3: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --r-sm: 8px;
  --r-md: 12px;
  --r-full: 9999px;
  --font-head: "Plus Jakarta Sans", -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", "Fira Code", ui-monospace, "SFMono-Regular", Consolas, Menlo, monospace;
}

html[data-theme="dark"] {
  --bg: #0e1524;
  --surface: #161f32;
  --surface-2: #1e2a42;
  --ink: #ecf1ff;
  --ink-soft: #a9b4c9;
  --ink-faint: #6b7690;
  --border: #2a3852;
  --primary: #7c9cf0;
  --primary-tint: #2563eb26;
  --secondary: #4edea3;
  --secondary-tint: #10b98122;
  --error: #e2685a;
  --error-tint: #e2685a24;
  --shadow-1: none;
  --shadow-2: 0 4px 10px -2px rgba(0, 0, 0, 0.35);
  --shadow-3: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  transition: background-color 0.25s ease, color 0.25s ease;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); }
::selection { background: var(--primary-tint); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.mono { font-family: var(--mono); }

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px 90px;
}

header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 28px 0 22px;
  border-bottom: 1px solid var(--border);
  gap: 16px;
  flex-wrap: wrap;
}

.brand { line-height: 1.4; }
.brand .tag {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--primary);
  text-transform: uppercase;
  font-weight: 600;
}
.brand h1 {
  font-family: var(--font-head);
  font-size: 24px;
  margin: 4px 0 0;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--ink);
}
.brand h1 span { color: var(--primary); }
.brand .sub {
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 4px;
}

.theme-toggle-minimal {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 20px;
  padding: 0;
  outline: none;
  transition: background-color 0.2s ease;
  color: var(--ink);
}
.theme-toggle-minimal:hover {
  background: var(--surface-2);
}

.hero { padding: 44px 0 8px; }
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 10px;
}
.hero h2 {
  font-family: var(--font-head);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.2;
  margin: 0 0 10px;
  font-weight: 800;
  max-width: 640px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.hero p {
  color: var(--ink-soft);
  max-width: 620px;
  font-size: 14.5px;
  line-height: 1.7;
  margin: 0 0 30px;
}

.omr {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-2);
  padding: 24px 24px 20px;
}
.omr-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 6px;
}
.omr-head b {
  color: var(--primary);
  letter-spacing: 0.02em;
  text-transform: none;
  font-size: 12.5px;
}

.bubbles {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
}
@media (max-width: 700px) {
  .bubbles { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 420px) {
  .bubbles { grid-template-columns: repeat(2, 1fr); }
}

.bub-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  padding: 12px 4px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.bub-item:hover { background: var(--surface-2); }
.bub-item.active {
  border-color: var(--primary);
  background: var(--primary-tint);
}

.bub-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.6px solid var(--ink-faint);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-faint);
  position: relative;
  background: var(--surface);
}
.bub-item.active .bub-circle {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--surface);
}
.bub-circle svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.bub-circle svg path {
  fill: none;
  stroke: var(--primary);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 140;
  stroke-dashoffset: 140;
  transition: stroke-dashoffset 0.35s ease;
}
.bub-item.active .bub-circle svg path { stroke-dashoffset: 0; }
@media (prefers-reduced-motion: reduce) {
  .bub-circle svg path { transition: none; }
}

.bub-label {
  font-size: 11px;
  text-align: center;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  font-weight: 500;
  line-height: 1.3;
}
.bub-item.active .bub-label {
  color: var(--primary);
  font-weight: 700;
}

.ticket {
  margin-top: 22px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 700px) {
  .ticket { grid-template-columns: repeat(2, 1fr); }
}
.tk-cell .k {
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
}
.tk-cell .v {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  margin-top: 4px;
  color: var(--ink);
}
.tk-cell .v.mode { color: var(--primary); }

.note-line {
  margin-top: 18px;
  font-size: 12.5px;
  color: var(--ink-soft);
  line-height: 1.6;
  background: var(--primary-tint);
  border-radius: var(--r-sm);
  padding: 12px 14px;
}
.note-line b { color: var(--primary); }

.sched-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 52px 0 14px;
  flex-wrap: wrap;
  gap: 10px;
}
.sched-head h3 {
  font-family: var(--font-head);
  font-size: 18px;
  margin: 0;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--ink);
}
.count {
  font-size: 12px;
  color: var(--ink-soft);
  font-weight: 500;
}

.export-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.export-btn {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  background: var(--surface);
  color: var(--primary);
  border: 1px solid var(--border);
  padding: 9px 16px;
  border-radius: var(--r-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: all 0.2s ease;
}
.export-btn:hover {
  background: var(--primary-tint);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}
.export-hint {
  font-size: 12px;
  color: var(--ink-faint);
  margin: 0 0 16px;
  line-height: 1.6;
}
.export-hint b { color: var(--ink-soft); }

.block {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--r-md);
  margin-bottom: 10px;
  overflow: hidden;
}
.block-top {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}
.block-top:hover { background: var(--surface-2); }
.day-badge {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-tint);
  padding: 5px 10px;
  border-radius: var(--r-full);
  flex: none;
  white-space: nowrap;
}
.block-id {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  flex: none;
  width: 20px;
}
.block-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14.5px;
  flex: 1;
  min-width: 120px;
  color: var(--ink);
}
.weight-dots {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--border);
  flex: none;
}
.weight-dots .on { color: var(--secondary); }
.depth-chip {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-tint);
  padding: 4px 9px;
  border-radius: var(--r-full);
  flex: none;
  white-space: nowrap;
}
.chev {
  font-size: 11px;
  color: var(--ink-faint);
  transition: transform 0.2s ease;
  flex: none;
}
.block.open .chev { transform: rotate(90deg); }

.block-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
  border-top: 0px solid var(--border);
}
.block.open .block-body {
  max-height: 1400px;
  border-top: 1px solid var(--border);
}

.topic {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  font-size: 13px;
}
.topic:first-child { border-top: none; }
.topic .t-name {
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 13.5px;
}
.topic .t-concepts {
  color: var(--ink-soft);
  line-height: 1.6;
  margin-bottom: 8px;
}
.refs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 11px;
}
.refs .r {
  font-family: var(--mono);
  color: var(--ink-soft);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: var(--r-sm);
}
.refs .r b {
  color: var(--ink-faint);
  font-weight: 600;
  font-family: var(--font-body);
}

.mock-block {
  border: 1px solid var(--secondary);
  background: var(--secondary-tint);
  border-radius: var(--r-md);
  padding: 16px 18px;
  font-size: 13px;
  color: var(--ink);
  line-height: 1.7;
  margin-top: 6px;
}
.mock-block b {
  color: var(--secondary);
  font-family: var(--font-head);
}

.skip-note {
  margin-top: 22px;
  font-size: 12.5px;
  color: var(--ink-soft);
  line-height: 1.8;
  background: var(--surface-2);
  border-radius: var(--r-md);
  padding: 14px 16px;
}
.skip-note b { color: var(--error); }

.powered-by-minimal {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
}
.status-dot {
  width: 6px;
  height: 6px;
  background-color: var(--secondary);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--secondary);
  animation: pulseOpacity 2s infinite;
}
@keyframes pulseOpacity {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}
.powered-by-minimal a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  border-bottom: 1px dashed var(--border);
  transition: all 0.2s ease;
}
.powered-by-minimal a:hover {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.site-footer {
  background-color: var(--surface-2);
  border-top: 1px solid var(--border);
  padding: 24px 20px;
  margin-top: 40px;
  text-align: center;
  border-radius: var(--r-md) var(--r-md) 0 0;
}
.footer-container {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.site-footer p {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0;
}