@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Sora:wght@600;700&display=swap");

:root {
  color-scheme: light;
  --bg: #f5f7f6;
  --bg-2: #e9efec;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-solid: #ffffff;
  --text: #122322;
  --muted: #445755;
  --accent: #0f766e;
  --accent-2: #14532d;
  --line: rgba(18, 35, 34, 0.12);
  --shadow: 0 24px 58px rgba(20, 42, 36, 0.14);
  --radius: 24px;
  --accent-dark: #0a5e59;
  --bg-3: #dfe9e4;
  --surface-card: rgba(255, 255, 255, 0.92);
  --panel-border: rgba(255, 255, 255, 0.72);
  --hero-panel-bg-from: rgba(255, 255, 255, 0.92);
  --hero-panel-bg-to: rgba(239, 248, 245, 0.84);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0, color-mix(in srgb, var(--accent) 20%, transparent), transparent 28%),
    radial-gradient(circle at 92% 18%, color-mix(in srgb, var(--accent-2) 17%, transparent), transparent 26%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-2) 52%, var(--bg-3) 100%);
}

.page-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.4rem 0 3.2rem;
}

.hero {
  margin-bottom: 1.15rem;
}

.eyebrow,
.result-kicker,
.field-label,
.hint,
.mini-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.76rem;
  color: var(--accent);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: 1rem;
  align-items: stretch;
}

.hero-copy {
  padding: 0.6rem 0.2rem 0 0;
}

h1,
h2,
h3 {
  margin: 0;
}

.hero h1,
.section-head h2 {
  font-family: "Sora", sans-serif;
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 0.98;
}

.hero h1 {
  max-width: 11ch;
  letter-spacing: -0.03em;
}

.lead {
  margin: 1rem 0 0;
  max-width: 62ch;
  line-height: 1.72;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.15rem;
}

.hero-cta,
.hero-secondary {
  min-width: 0;
  padding: 0.8rem 1rem;
  font-size: 0.9rem;
}

.hero-panel {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background:
    radial-gradient(circle at 12% 12%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 30%),
    linear-gradient(145deg, var(--hero-panel-bg-from), var(--hero-panel-bg-to));
  padding: 1.1rem 1.2rem;
  overflow: hidden;
}

.hero-panel h2 {
  font-size: 1.1rem;
}

.hero-visual {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.8rem;
  padding: 0.9rem 0 1rem;
}

.hero-visual::before,
.hero-visual::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 28%;
  height: 2px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 15%, transparent), color-mix(in srgb, var(--accent) 55%, transparent));
}

.hero-visual::before {
  left: 18%;
}

.hero-visual::after {
  right: 18%;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 55%, transparent), color-mix(in srgb, var(--accent-2) 20%, transparent));
}

.flow-column {
  display: grid;
  gap: 0.55rem;
  justify-items: center;
}

.flow-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 5.5rem;
  padding: 0.42rem 0.65rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  background: var(--surface-solid);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
}

.flow-chip-strong {
  color: #f6fffd;
  background: linear-gradient(130deg, var(--accent) 0%, var(--accent-2) 100%);
  border-color: transparent;
}

.flow-core {
  position: relative;
  width: 7.2rem;
  height: 7.2rem;
  display: grid;
  place-items: center;
}

.core-ring,
.core-ring-delayed {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
}

.core-ring-delayed {
  inset: 0.45rem;
  border-color: color-mix(in srgb, var(--accent-2) 24%, transparent);
}

.core-node {
  position: relative;
  z-index: 1;
  width: 3.55rem;
  height: 3.55rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-family: "Sora", sans-serif;
  font-weight: 700;
  color: #f4fffc;
  background: linear-gradient(145deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 16px 32px color-mix(in srgb, var(--accent) 18%, transparent);
}

.hero-feature-block {
  margin-top: 0.35rem;
}

.hero-feature-list {
  display: grid;
  gap: 0.7rem;
  margin-top: 0.85rem;
}

.hero-feature {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.8rem 0.85rem;
  border-radius: 18px;
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--accent) 10%, transparent);
}

.hero-feature h3 {
  font-size: 0.98rem;
}

.hero-feature p {
  margin: 0.28rem 0 0;
  color: var(--muted);
  line-height: 1.58;
}

.hero-feature-icon {
  width: 2rem;
  height: 2rem;
  display: inline-grid;
  place-items: center;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 11%, transparent);
  color: var(--accent);
  font-weight: 800;
}

.hero-panel ul {
  margin: 0.8rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
  line-height: 1.55;
}

main {
  display: grid;
  gap: 1rem;
}

.main-layout {
  display: grid;
  grid-template-columns: minmax(260px, 300px) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.content-stack {
  display: grid;
  gap: 1rem;
}

.panel {
  border-radius: var(--radius);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  background: var(--surface);
  padding: 1.1rem 1.15rem;
}

.collapsible-panel {
  padding: 0;
  overflow: hidden;
}

.collapsible-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
  cursor: pointer;
  padding: 1.1rem 1.15rem;
}

.collapsible-summary::-webkit-details-marker {
  display: none;
}

.collapsible-summary::after {
  content: "+";
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: var(--accent-dark);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
}

.collapsible-panel[open] > .collapsible-summary::after {
  content: "−";
}

.collapsible-summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 27%, transparent);
  outline-offset: -3px;
}

.collapsible-summary .section-head {
  margin-bottom: 0;
}

.collapsible-body {
  padding: 0 1.15rem 1.15rem;
}

.panel-filters {
  position: sticky;
  top: 0.8rem;
  z-index: 5;
  max-height: calc(100vh - 1.6rem);
  overflow-y: auto;
  overflow-x: hidden;
}

.filter-row {
  display: grid;
  gap: 0.45rem;
}

.filter-sort-row {
  margin-top: 0.75rem;
}

#search-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.8rem 0.9rem;
  font: inherit;
  color: var(--text);
  background: var(--surface-solid);
}

#sort-select {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.52rem 0.65rem;
  font: inherit;
  color: var(--text);
  background: var(--surface-solid);
}

#skill-level,
#budget-tier,
#hosting-preference,
#build-speed {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.52rem 0.65rem;
  font: inherit;
  color: var(--text);
  background: var(--surface-solid);
}

#search-input:focus-visible,
#sort-select:focus-visible,
#skill-level:focus-visible,
#budget-tier:focus-visible,
#hosting-preference:focus-visible,
#build-speed:focus-visible,
.chip:focus-visible,
.link-btn:focus-visible,
.history-link:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 27%, transparent);
  outline-offset: 2px;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.85rem;
}

.chip {
  border: 1px solid var(--line);
  background: var(--surface-solid);
  color: var(--text);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.chip.is-active {
  background: linear-gradient(130deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #f5fffc;
  border-color: transparent;
}

.hint {
  margin: 0.9rem 0 0;
  color: var(--muted);
}

.resource-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.spotlight-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.spotlight-card {
  border-radius: 20px;
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  background: linear-gradient(145deg, color-mix(in srgb, var(--accent) 10%, var(--surface-solid)), var(--surface-solid));
  padding: 1rem;
}

.spotlight-card h3 {
  margin-top: 0.28rem;
  font-size: 1.18rem;
}

.spotlight-card p {
  margin: 0.58rem 0 0;
  color: var(--muted);
  line-height: 1.58;
}

.spotlight-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.7rem;
}

.spotlight-meta span {
  border-radius: 999px;
  padding: 0.27rem 0.58rem;
  font-size: 0.76rem;
  background: color-mix(in srgb, var(--accent) 11%, transparent);
  color: var(--accent-dark);
}

.section-head-compact {
  margin-bottom: 1rem;
}

.lead-mini {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.matrix-grid {
  margin-top: 0.95rem;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.matrix-actions {
  margin-top: 0.9rem;
}

.matrix-run {
  border: 0;
  cursor: pointer;
}

.matrix-result {
  margin-top: 0.85rem;
}

.matrix-card {
  border-radius: 20px;
  background: var(--surface-card);
  border: 1px solid var(--line);
  padding: 1rem;
}

.matrix-card h3 {
  margin-top: 0.28rem;
  font-size: 1.12rem;
}

.matrix-card p {
  margin: 0.52rem 0 0;
  color: var(--muted);
  line-height: 1.62;
}

.matrix-meta {
  margin-top: 0.72rem;
}

.blueprint-grid {
  margin-top: 0.95rem;
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.blueprint-card {
  border-radius: 20px;
  background: var(--surface-card);
  border: 1px solid var(--line);
  padding: 1rem;
}

.blueprint-card h3 {
  font-size: 1.05rem;
}

.blueprint-card p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.blueprint-flow {
  margin-top: 0.72rem;
  border-radius: 14px;
  padding: 0.6rem 0.7rem;
  font-size: 0.84rem;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--text);
}

.blueprint-stack {
  margin-top: 0.7rem;
}

.learning-block {
  margin-top: 1.05rem;
}

.learning-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.learning-card {
  border-radius: 20px;
  background: var(--surface-card);
  border: 1px solid var(--line);
  padding: 1rem;
}

.learning-card h3 {
  margin-top: 0.24rem;
  font-size: 1.08rem;
}

.learning-link {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 0.2em;
}

.learning-link:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.learning-link:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 27%, transparent);
  outline-offset: 2px;
}

.learning-type-note {
  margin: 0;
  color: var(--accent);
}

.learning-card p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  line-height: 1.62;
}

.learning-meta {
  margin-top: 0.68rem;
}

.learning-meta span {
  display: inline-flex;
  border-radius: 999px;
  padding: 0.25rem 0.55rem;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 600;
}

.difficulty-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.24rem 0.6rem;
  font-size: 0.74rem;
  font-weight: 700;
}

.difficulty-easy {
  color: #155e3f;
  background: rgba(34, 197, 94, 0.17);
}

.difficulty-medium {
  color: #854d0e;
  background: rgba(234, 179, 8, 0.22);
}

.difficulty-advanced {
  color: #7f1d1d;
  background: rgba(248, 113, 113, 0.2);
}

.resource-section {
  display: grid;
  gap: 0.85rem;
}

.resource-section-head h3 {
  font-family: "Sora", sans-serif;
  font-size: 1.25rem;
}

.resource-section-head p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.resource-subgrid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.resource-card,
.resource-empty,
.timeline-item,
.community-grid article,
.history-item,
.history-empty {
  border-radius: 20px;
  background: var(--surface-card);
  border: 1px solid var(--line);
  padding: 1rem;
}

.resource-card h3 {
  margin-top: 0.2rem;
  font-size: 1.18rem;
}

.card-topline {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
}

.resource-type-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.28rem 0.62rem;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
}

.summary {
  margin: 0.65rem 0 0;
  color: var(--muted);
  line-height: 1.65;
}

.resource-meta {
  margin: 0.85rem 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.resource-meta div {
  padding: 0.65rem 0.7rem;
  border-radius: 16px;
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 9%, transparent);
}

.resource-meta dt {
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
  color: var(--accent);
}

.resource-meta dd {
  margin: 0.35rem 0 0;
  color: var(--text);
  font-weight: 600;
  line-height: 1.45;
}

.pill-list {
  margin-top: 0.72rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.pill {
  border-radius: 999px;
  padding: 0.32rem 0.62rem;
  font-size: 0.78rem;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent-dark);
}

.resource-actions {
  margin-top: 0.95rem;
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.link-btn,
.history-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 0.5rem 0.76rem;
  border: 1px solid transparent;
}

.link-btn {
  background: linear-gradient(130deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #f6fffd;
}

.link-btn.ghost {
  background: transparent;
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
}

.link-btn.is-disabled {
  opacity: 0.55;
  pointer-events: none;
}

.section-head {
  display: grid;
  gap: 0.25rem;
  margin-bottom: 0.8rem;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.07;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.timeline-item {
  display: grid;
  align-content: start;
}

.timeline-item h3 {
  margin-top: 0.35rem;
  font-size: 1.08rem;
}

.timeline-item p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  line-height: 1.62;
}

.timeline-meta {
  margin-top: 0.72rem;
}

.timeline-meta span {
  display: inline-flex;
  border-radius: 999px;
  padding: 0.25rem 0.55rem;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 600;
}

.site-footer {
  margin-top: 1.1rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 1020px) {
  .hero-grid,
  .matrix-grid,
  .blueprint-grid,
  .timeline,
  .spotlight-grid,
  .learning-grid,
  .resource-subgrid,
  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .main-layout {
    grid-template-columns: 1fr;
  }

  .panel-filters {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 780px) {
  .hero-grid,
  .matrix-grid,
  .blueprint-grid,
  .timeline,
  .spotlight-grid,
  .learning-grid,
  .resource-subgrid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  #sort-select {
    width: 100%;
    min-width: 0;
  }

  .resource-meta {
    grid-template-columns: 1fr;
  }

  .hero h1,
  .section-head h2 {
    font-size: clamp(1.7rem, 10vw, 2.5rem);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-cta,
  .hero-secondary {
    width: 100%;
    justify-content: center;
  }

  .hero-visual {
    grid-template-columns: 1fr;
  }

  .hero-visual::before,
  .hero-visual::after {
    display: none;
  }

  .flow-column {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    justify-items: stretch;
  }

  .flow-chip {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .panel,
  .resource-card,
  .timeline-item,
  .community-grid article {
    animation: fade-up 520ms ease both;
  }

  .core-ring,
  .core-ring-delayed {
    animation: pulse-ring 4s ease-in-out infinite;
  }

  .core-ring-delayed {
    animation-delay: 900ms;
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-ring {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.85;
  }

  50% {
    transform: scale(1.05);
    opacity: 0.45;
  }
}

/* ─── Color theme palettes ─────────────────────────────────── */

:root[data-color="blue"] {
  --bg: #f4f6fb;
  --bg-2: #e8edf8;
  --bg-3: #dde5f5;
  --text: #0f1e35;
  --muted: #3d4f6b;
  --accent: #1d4ed8;
  --accent-2: #1e3a8a;
  --accent-dark: #1641b6;
  --line: rgba(15, 30, 53, 0.12);
  --shadow: 0 24px 58px rgba(15, 30, 53, 0.14);
  --hero-panel-bg-to: rgba(230, 238, 255, 0.84);
}

:root[data-color="purple"] {
  --bg: #f7f5fb;
  --bg-2: #eee8f8;
  --bg-3: #e0d6f5;
  --text: #1a0f35;
  --muted: #4a3d68;
  --accent: #7c3aed;
  --accent-2: #4c1d95;
  --accent-dark: #6426d2;
  --line: rgba(26, 15, 53, 0.12);
  --shadow: 0 24px 58px rgba(26, 15, 53, 0.14);
  --hero-panel-bg-to: rgba(238, 232, 255, 0.84);
}

:root[data-color="orange"] {
  --bg: #faf6f2;
  --bg-2: #f0e8de;
  --bg-3: #e8d8c8;
  --text: #2d1208;
  --muted: #6b3a25;
  --accent: #c2410c;
  --accent-2: #7c2d12;
  --accent-dark: #a13509;
  --line: rgba(45, 18, 8, 0.12);
  --shadow: 0 24px 58px rgba(45, 18, 8, 0.14);
  --hero-panel-bg-to: rgba(255, 238, 225, 0.84);
}

:root[data-color="red"] {
  --bg: #fbf3f3;
  --bg-2: #f6e5e5;
  --bg-3: #edd1d1;
  --text: #2f1111;
  --muted: #744040;
  --accent: #b91c1c;
  --accent-2: #7f1d1d;
  --accent-dark: #991b1b;
  --line: rgba(47, 17, 17, 0.12);
  --shadow: 0 24px 58px rgba(47, 17, 17, 0.14);
  --hero-panel-bg-to: rgba(255, 234, 234, 0.86);
}

:root[data-color="black"] {
  --bg: #f4f4f5;
  --bg-2: #e7e8ea;
  --bg-3: #dadcdf;
  --text: #111111;
  --muted: #4a4a50;
  --accent: #1f2937;
  --accent-2: #111827;
  --accent-dark: #0f172a;
  --line: rgba(17, 17, 17, 0.14);
  --shadow: 0 24px 58px rgba(17, 17, 17, 0.16);
  --hero-panel-bg-to: rgba(236, 239, 243, 0.86);
}

:root[data-color="brown"] {
  --bg: #f8f4f0;
  --bg-2: #ede4db;
  --bg-3: #e2d4c6;
  --text: #2b1a12;
  --muted: #6f4f3f;
  --accent: #7c4a2d;
  --accent-2: #5b371f;
  --accent-dark: #5b371f;
  --line: rgba(43, 26, 18, 0.12);
  --shadow: 0 24px 58px rgba(43, 26, 18, 0.14);
  --hero-panel-bg-to: rgba(244, 233, 221, 0.86);
}

:root[data-color="white"] {
  --bg: #ffffff;
  --bg-2: #f5f7fa;
  --bg-3: #e9edf3;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-solid: #ffffff;
  --surface-card: rgba(255, 255, 255, 0.96);
  --panel-border: rgba(12, 18, 28, 0.08);
  --hero-panel-bg-from: rgba(255, 255, 255, 0.96);
  --hero-panel-bg-to: rgba(244, 248, 255, 0.92);
  --text: #0b1220;
  --muted: #4a586e;
  --accent: #334155;
  --accent-2: #0f172a;
  --accent-dark: #0f172a;
  --line: rgba(11, 18, 32, 0.12);
  --shadow: 0 24px 58px rgba(11, 18, 32, 0.12);
}

/* ─── Dark mode ─────────────────────────────────────────────── */

:root[data-mode="dark"] {
  color-scheme: dark;
  --bg: #0d1a18;
  --bg-2: #152420;
  --bg-3: #0a1210;
  --surface: rgba(20, 45, 40, 0.82);
  --surface-solid: #1c3430;
  --surface-card: rgba(22, 48, 43, 0.95);
  --panel-border: rgba(255, 255, 255, 0.07);
  --hero-panel-bg-from: rgba(20, 45, 40, 0.95);
  --hero-panel-bg-to: rgba(12, 28, 24, 0.88);
  --text: #d4edea;
  --muted: #8ab5b0;
  --accent: #2dd4bf;
  --accent-2: #34d399;
  --accent-dark: #2dd4bf;
  --line: rgba(180, 230, 220, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.42);
}

:root[data-mode="dark"][data-color="blue"] {
  --bg: #0d1220;
  --bg-2: #131a30;
  --bg-3: #0a1025;
  --surface: rgba(15, 25, 55, 0.82);
  --surface-solid: #1a2540;
  --surface-card: rgba(18, 28, 52, 0.95);
  --hero-panel-bg-from: rgba(15, 25, 55, 0.95);
  --hero-panel-bg-to: rgba(10, 18, 40, 0.88);
  --text: #d0deff;
  --muted: #7b9acc;
  --accent: #60a5fa;
  --accent-2: #93c5fd;
  --accent-dark: #60a5fa;
  --line: rgba(150, 190, 255, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.42);
}

:root[data-mode="dark"][data-color="purple"] {
  --bg: #120d20;
  --bg-2: #1a1330;
  --bg-3: #0e0a1a;
  --surface: rgba(28, 18, 55, 0.82);
  --surface-solid: #1e1540;
  --surface-card: rgba(25, 18, 50, 0.95);
  --hero-panel-bg-from: rgba(28, 18, 55, 0.95);
  --hero-panel-bg-to: rgba(12, 8, 35, 0.88);
  --text: #e2d8ff;
  --muted: #9b88cc;
  --accent: #a78bfa;
  --accent-2: #c4b5fd;
  --accent-dark: #a78bfa;
  --line: rgba(180, 160, 255, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.42);
}

:root[data-mode="dark"][data-color="orange"] {
  --bg: #1a0d08;
  --bg-2: #251510;
  --bg-3: #120a05;
  --surface: rgba(45, 22, 10, 0.82);
  --surface-solid: #3a1a0a;
  --surface-card: rgba(40, 20, 10, 0.95);
  --hero-panel-bg-from: rgba(45, 22, 10, 0.95);
  --hero-panel-bg-to: rgba(25, 10, 4, 0.88);
  --text: #ffd9c8;
  --muted: #c48a6a;
  --accent: #fb923c;
  --accent-2: #fbbf24;
  --accent-dark: #fb923c;
  --line: rgba(255, 180, 130, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.42);
}

:root[data-mode="dark"][data-color="red"] {
  --bg: #1e0d0d;
  --bg-2: #2a1313;
  --bg-3: #130909;
  --surface: rgba(52, 20, 20, 0.82);
  --surface-solid: #3a1919;
  --surface-card: rgba(46, 18, 18, 0.95);
  --hero-panel-bg-from: rgba(52, 20, 20, 0.95);
  --hero-panel-bg-to: rgba(24, 9, 9, 0.88);
  --text: #ffd9d9;
  --muted: #d49a9a;
  --accent: #f87171;
  --accent-2: #fca5a5;
  --accent-dark: #fca5a5;
  --line: rgba(255, 180, 180, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.42);
}

:root[data-mode="dark"][data-color="black"] {
  --bg: #06080d;
  --bg-2: #0e1219;
  --bg-3: #04060a;
  --surface: rgba(18, 24, 34, 0.82);
  --surface-solid: #141a24;
  --surface-card: rgba(16, 21, 30, 0.95);
  --hero-panel-bg-from: rgba(18, 24, 34, 0.95);
  --hero-panel-bg-to: rgba(7, 10, 16, 0.88);
  --text: #e6ebf2;
  --muted: #a3afbf;
  --accent: #d1d5db;
  --accent-2: #9ca3af;
  --accent-dark: #e5e7eb;
  --line: rgba(220, 230, 245, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.5);
}

:root[data-mode="dark"][data-color="brown"] {
  --bg: #1a120d;
  --bg-2: #261a13;
  --bg-3: #0f0a06;
  --surface: rgba(46, 30, 21, 0.82);
  --surface-solid: #342317;
  --surface-card: rgba(40, 26, 19, 0.95);
  --hero-panel-bg-from: rgba(46, 30, 21, 0.95);
  --hero-panel-bg-to: rgba(21, 13, 8, 0.88);
  --text: #ffe4d3;
  --muted: #c89e80;
  --accent: #d6a074;
  --accent-2: #f1c79f;
  --accent-dark: #f1c79f;
  --line: rgba(255, 210, 180, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.44);
}

:root[data-mode="dark"][data-color="white"] {
  --bg: #111318;
  --bg-2: #181c24;
  --bg-3: #0b0d12;
  --surface: rgba(30, 35, 44, 0.82);
  --surface-solid: #222936;
  --surface-card: rgba(28, 33, 42, 0.95);
  --hero-panel-bg-from: rgba(30, 35, 44, 0.95);
  --hero-panel-bg-to: rgba(15, 18, 24, 0.88);
  --text: #f1f5f9;
  --muted: #b4c0d0;
  --accent: #e2e8f0;
  --accent-2: #cbd5e1;
  --accent-dark: #f8fafc;
  --line: rgba(225, 235, 245, 0.14);
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.46);
}

/* Dark mode — difficulty badge overrides */
:root[data-mode="dark"] .difficulty-easy {
  color: #4ade80;
  background: rgba(74, 222, 128, 0.15);
}

:root[data-mode="dark"] .difficulty-medium {
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.18);
}

:root[data-mode="dark"] .difficulty-advanced {
  color: #f87171;
  background: rgba(248, 113, 113, 0.18);
}

/* ─── Theme picker bar ──────────────────────────────────────── */

.theme-bar {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.9rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}

.theme-colors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  flex: 1;
  align-items: center;
  min-width: 0;
}

.theme-swatch {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  border: 2px solid transparent;
  background: var(--sw);
  cursor: pointer;
  padding: 0;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.theme-swatch[data-color="white"] {
  border-color: color-mix(in srgb, var(--text) 22%, transparent);
  background: linear-gradient(135deg, #ffffff 0%, #eef4fb 100%);
}

.theme-swatch:hover {
  transform: scale(1.18);
}

.theme-swatch.is-active {
  border-color: var(--text);
  box-shadow: 0 0 0 2px var(--surface-solid), 0 0 0 4px var(--sw);
}

.theme-mode-toggle {
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface-solid);
  color: var(--text);
  cursor: pointer;
  font-size: 0.95rem;
  display: grid;
  place-items: center;
  padding: 0;
  transition: background 0.15s ease;
}

.theme-mode-toggle:hover {
  background: var(--bg-2);
}