/* Knowledge Forge Topic Exchange — visual language aligned with AppTheme dark */
:root {
  --bg: #07111c;
  --surface: #0f1825;
  --card: #131e2d;
  --muted: #182334;
  --line: rgba(255, 255, 255, 0.09);
  --primary: #33e0ce;
  --primary-strong: #22d3c5;
  --secondary: #ffc95a;
  --tertiary: #79b8ff;
  --text: #f4f8fb;
  --text-muted: #9eacbe;
  --text-low: #7a8799;
  --danger: #ef9a9a;
  --radius-card: 28px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --radius-pill: 999px;
  --content: 1100px;
  --pad: 20px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);

  --type-core: #4db6ac;
  --type-memory: #e9c46a;
  --type-term: #4fc3f7;
  --type-error: #ef9a9a;
  --type-practice: #90be6d;
  --type-solution: #f4a261;
  --type-tlDr: #84a59d;
  --type-source: #7b9acc;
  --type-checklist: #a3b18a;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, Roboto, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 0%, rgba(51, 224, 206, 0.1), transparent 28%),
    radial-gradient(circle at 88% 8%, rgba(121, 184, 255, 0.06), transparent 24%),
    var(--bg);
}

a {
  color: inherit;
  text-decoration: none;
}

.shell {
  width: min(var(--content), calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 56px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand span {
  color: var(--primary);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
  font-weight: 800;
}

h1 {
  font-size: clamp(1.85rem, 3.4vw, 2.45rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.28rem;
  font-weight: 700;
}

.lead {
  margin: 10px 0 0;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 62ch;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0;
}

.input {
  flex: 1 1 240px;
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--muted);
  color: var(--text);
  font: inherit;
}

.input:focus {
  outline: 2px solid color-mix(in srgb, var(--primary) 45%, transparent);
  outline-offset: 1px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: color-mix(in srgb, var(--primary) 88%, white);
  color: #04201c;
}

.button-ghost {
  border-color: var(--line);
  background: transparent;
  color: var(--text);
}

.button-ghost:hover {
  border-color: color-mix(in srgb, var(--primary) 40%, transparent);
}

.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.status {
  margin: 0 0 14px;
  color: var(--text-low);
  font-size: 0.92rem;
}

.status.is-error {
  color: var(--danger);
}

.topic-grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 720px) {
  .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.topic-card {
  display: grid;
  gap: 10px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--card);
  box-shadow: var(--shadow);
  transition: border-color 160ms ease, transform 160ms ease;
  view-transition-name: topic-card;
}

.topic-card:hover {
  border-color: color-mix(in srgb, var(--primary) 45%, transparent);
  transform: translateY(-2px);
}

.topic-card-icon {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  color: var(--primary);
  font-size: 1.35rem;
  font-weight: 800;
}

.topic-card h2 {
  font-size: 1.15rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  color: var(--text-low);
  font-size: 0.82rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
}

.pill-gold {
  background: color-mix(in srgb, var(--secondary) 16%, transparent);
  color: var(--secondary);
}

.hero-card,
.panel,
.note-hero {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--card);
  box-shadow: var(--shadow);
}

.hero-card {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
  view-transition-name: topic-hero;
}

.hero-top {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
}

.hero-icon {
  width: 72px;
  height: 72px;
  border-radius: 26px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  color: var(--primary);
  font-size: 1.8rem;
  font-weight: 800;
}

.layout {
  display: grid;
  gap: 16px;
}

@media (min-width: 980px) {
  .layout {
    grid-template-columns: minmax(0, 11fr) minmax(260px, 5fr);
    align-items: start;
  }
}

.panel + .panel,
.section-stack > .panel + .panel {
  margin-top: 14px;
}

.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.section-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin: 0;
  padding: 0 0 4px;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.section-toggle h2 {
  flex: 1;
  min-width: 0;
}

.section-toggle-chevron {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  color: var(--primary);
  font-size: 0.95rem;
  line-height: 1;
  transition: transform 160ms ease, background 160ms ease;
}

.section-toggle:hover .section-toggle-chevron {
  background: color-mix(in srgb, var(--primary) 20%, transparent);
}

.panel-collapsible.is-collapsed .section-toggle-chevron {
  transform: rotate(-90deg);
}

.panel-body {
  overflow: hidden;
}

.panel-collapsible.is-collapsed .panel-body {
  display: none;
}

.count {
  color: var(--text-low);
  font-size: 0.85rem;
  font-weight: 600;
}

.note-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.note-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px 14px;
  align-items: center;
  padding: 12px 4px;
  border-top: 1px solid var(--line);
  transition: background 120ms ease;
}

.note-row:first-child {
  border-top: 0;
}

.note-row:hover {
  background: color-mix(in srgb, white 3%, transparent);
}

.note-row-main {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  align-items: center;
  min-width: 0;
}

.note-row-title {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 600;
}

.type-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: none;
  background: color-mix(in srgb, var(--type-accent, var(--primary)) 14%, transparent);
  color: var(--type-accent, var(--primary));
}

.note-row-chevron {
  color: var(--text-low);
  font-size: 1.1rem;
}

.note-hero {
  margin-bottom: 16px;
  border-color: color-mix(in srgb, var(--type-accent, var(--primary)) 40%, transparent);
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--type-accent, var(--primary)) 12%, transparent),
      color-mix(in srgb, var(--type-accent, var(--primary)) 4%, var(--card))
    );
  view-transition-name: note-hero;
}

.note-hero .hero-icon {
  background: color-mix(in srgb, var(--type-accent, var(--primary)) 18%, transparent);
  color: var(--type-accent, var(--primary));
}

.note-body-card {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--card);
}

.note-body-card h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-muted);
}

.note-body {
  margin: 0;
  color: var(--text);
  font-size: 1.02rem;
  line-height: 1.75;
  white-space: pre-wrap;
}

.side-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.side-item {
  padding: 10px 0;
  border-top: 1px solid var(--line);
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.side-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.empty {
  color: var(--text-low);
  font-size: 0.92rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.footer-note {
  margin-top: 28px;
  color: var(--text-low);
  font-size: 0.85rem;
}

.footer-note code {
  color: var(--primary);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.shell > main,
#topic-root,
#note-root {
  animation: fade-up 220ms ease;
}

@media (prefers-reduced-motion: reduce) {
  .shell > main,
  #topic-root,
  #note-root,
  .button,
  .topic-card,
  .note-row {
    animation: none;
    transition: none;
  }
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 220ms;
}