.icon-btn:focus-visible,
.btn:focus-visible,
.nav-item:focus-visible,
.search-form input:focus-visible,
.lesson-link:focus-visible,
.tech-card:focus-visible,
.project-row:focus-visible,
.project-card:focus-visible {
  outline: 2px solid #60a5fa;
  outline-offset: 2px;
}

/* Sidebar */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  background: linear-gradient(180deg, rgba(10, 16, 32, 0.98), rgba(8, 12, 24, 0.98));
  border-right: 1px solid var(--border);
  z-index: 40;
  overflow-y: auto;
}

[data-theme="light"] .sidebar {
  background: #fff;
}

.sidebar__brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 4px 8px;
}

.brand-name {
  font-weight: 700;
  font-size: 1rem;
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.7rem 0.85rem;
  border-radius: 12px;
  color: var(--text-muted);
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-item:hover {
  background: rgba(148, 163, 184, 0.08);
  color: var(--text);
}

.nav-item.is-active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.35), rgba(139, 92, 246, 0.35));
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(147, 197, 253, 0.25);
}

.nav-icon {
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
}

.nav-icon svg {
  width: 18px;
  height: 18px;
}

.sidebar__promo {
  margin-top: auto;
  padding: 16px;
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 20% 0%, rgba(168, 85, 247, 0.25), transparent 50%),
    rgba(30, 41, 59, 0.7);
  border: 1px solid var(--border);
  text-align: center;
}

.sidebar__promo h3 {
  margin: 8px 0 4px;
  font-size: 1rem;
}

.sidebar__promo p {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.promo-art {
  font-size: 1.6rem;
}

.sidebar__footnote {
  margin: 0;
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 30;
}

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 22px 28px 12px;
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(7, 11, 20, 0.92), rgba(7, 11, 20, 0.55) 70%, transparent);
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "hero controls"
    "hero stats";
  gap: 12px 20px;
  align-items: start;
}

[data-theme="light"] .topbar {
  background: linear-gradient(180deg, rgba(241, 245, 249, 0.95), rgba(241, 245, 249, 0.6) 70%, transparent);
}

.topbar__hero {
  grid-area: hero;
}

.topbar__controls {
  grid-area: controls;
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.stat-pills {
  grid-area: stats;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

[data-theme="light"] .stat-pill {
  background: rgba(255, 255, 255, 0.9);
}

.stat-pill strong {
  color: var(--text);
  font-size: 1rem;
}

.stat-pill--progress {
  padding-right: 1rem;
}

.search-form {
  position: relative;
  display: flex;
  align-items: center;
}

.search-form input {
  width: min(240px, 42vw);
  padding: 0.55rem 0.85rem 0.55rem 2.1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.55);
  color: var(--text);
  outline: none;
}

[data-theme="light"] .search-form input {
  background: #fff;
}

.search-form input:focus {
  border-color: rgba(96, 165, 250, 0.6);
  box-shadow: 0 0 0 3px var(--glow);
}

.search-icon {
  position: absolute;
  left: 12px;
  color: var(--text-dim);
  pointer-events: none;
}

.search-suggest {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--bg-panel-solid);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  z-index: 30;
}

.search-suggest a {
  display: block;
  padding: 0.65rem 0.85rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.search-suggest a:hover {
  background: rgba(59, 130, 246, 0.12);
  color: var(--text);
}

/* Panels */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  animation: rise 0.45s ease both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel__head h2 {
  margin: 0;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.info-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  display: grid;
  place-items: center;
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* Overview layout */
.overview-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 22px;
}

.journey-projects {
  display: grid;
  grid-template-columns: 1.6fr 0.9fr;
  gap: 22px;
}

/* Landscape */
.landscape__root {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 8px;
}

.root-node {
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.35), rgba(168, 85, 247, 0.35));
  border: 1px solid rgba(147, 197, 253, 0.35);
}

.landscape__trunk {
  width: 2px;
  height: 18px;
  background: linear-gradient(180deg, rgba(147, 197, 253, 0.5), transparent);
}

.landscape__branches {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.branch-card {
  position: relative;
  padding: 14px;
  border-radius: 14px;
  background: rgba(2, 6, 23, 0.45);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 12%, transparent),
    0 10px 30px color-mix(in srgb, var(--accent) 12%, transparent);
}

[data-theme="light"] .branch-card {
  background: #fff;
}

.branch-card__title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.branch-card h3 {
  margin: 0;
  font-size: 0.98rem;
}

.accent-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

.branch-card p {
  margin: 8px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.branch-card ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.branch-card__link {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
}

/* Stack diagram */
.stack-diagram {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stack-row {
  display: flex;
  justify-content: center;
}

.stack-body {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 10px;
  align-items: center;
}

.stack-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stack-node {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  background: rgba(15, 23, 42, 0.65);
  text-align: center;
}

[data-theme="light"] .stack-node {
  background: #fff;
}

.stack-node strong {
  display: block;
  font-size: 0.82rem;
  color: var(--accent);
}

.stack-node small {
  display: block;
  margin-top: 2px;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.stack-node--core {
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(168, 85, 247, 0.08));
}

.stack-node--app {
  width: 100%;
  background: linear-gradient(90deg, rgba(148, 163, 184, 0.12), rgba(168, 85, 247, 0.12));
}

/* Tech cards */
.tech-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(180px, 1fr);
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.tech-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  min-height: 190px;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
  background: rgba(2, 6, 23, 0.4);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

[data-theme="light"] .tech-card {
  background: #fff;
}

.tech-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
}

.tech-card__icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #fff;
  background: var(--accent);
}

.tech-card h3 {
  margin: 0;
  font-size: 1rem;
}

.tech-card p {
  margin: 0;
  flex: 1;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.tech-card__use {
  font-size: 0.78rem;
  color: var(--text);
  border-top: 1px solid var(--border);
  padding-top: 8px;
}

.tech-card__use span {
  display: block;
  color: var(--text-dim);
  font-size: 0.7rem;
  margin-bottom: 2px;
}

/* Journey */
.journey-track {
  display: grid;
  grid-template-columns: repeat(7, minmax(120px, 1fr));
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.journey-step {
  min-width: 130px;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  background: rgba(2, 6, 23, 0.45);
}

[data-theme="light"] .journey-step {
  background: #fff;
}

.journey-step__num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
}

.journey-step h3 {
  margin: 4px 0 8px;
  font-size: 0.9rem;
}

.journey-step ul {
  margin: 0 0 10px;
  padding-left: 1rem;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.journey-step__progress {
  display: flex;
  align-items: center;
  gap: 8px;
}

.step-percent {
  font-size: 0.8rem;
  font-weight: 600;
}

.journey-line {
  height: 2px;
  margin-top: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #22c55e, #3b82f6, #a855f7, #f59e0b, #8b5cf6);
  opacity: 0.55;
}

/* Progress rings */
.progress-ring__bg,
.progress-ring__value {
  fill: none;
  stroke-width: 3;
}

.progress-ring__bg {
  stroke: var(--ring-track);
}

.progress-ring__value {
  stroke: #60a5fa;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
  stroke-dasharray: 88;
  stroke-dashoffset: 88;
  transition: stroke-dashoffset 0.5s ease;
}

/* Projects */
.project-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.35);
  transition: background 0.15s ease, border-color 0.15s ease;
}

[data-theme="light"] .project-row {
  background: #fff;
}

.project-row:hover {
  border-color: rgba(96, 165, 250, 0.45);
  background: rgba(59, 130, 246, 0.08);
}

.project-row__icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  background: rgba(96, 165, 250, 0.2);
  color: #93c5fd;
}

.project-row__title {
  font-size: 0.9rem;
  font-weight: 500;
}

.project-row__chevron {
  color: var(--text-dim);
  font-size: 1.3rem;
}

.projects-all {
  display: inline-block;
  margin-top: 12px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.project-card {
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.4);
}

[data-theme="light"] .project-card {
  background: #fff;
}

.project-card__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.difficulty {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.project-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.project-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* Footer */
.site-footer {
  padding: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.footer-tips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.footer-tips span {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-quote {
  margin: 0;
  max-width: 560px;
  padding: 14px 18px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(59, 130, 246, 0.12));
  border: 1px solid rgba(168, 85, 247, 0.25);
  color: var(--text-muted);
  font-style: italic;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  font-size: 0.9rem;
  color: #93c5fd;
}

.footer-tagline {
  margin: 0;
  font-weight: 600;
}

.footer-made {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.heart {
  color: #f472b6;
}

/* Inner pages */
.page-panel,
.doc-panel {
  max-width: 1100px;
}

.landscape-detail,
.path-list,
.resource-groups,
.community-grid,
.glossary-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.detail-card,
.path-card,
.community-card,
.glossary-item,
.resource-group,
.tip-box,
.search-group {
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.35);
}

[data-theme="light"] .detail-card,
[data-theme="light"] .path-card,
[data-theme="light"] .community-card,
[data-theme="light"] .glossary-item,
[data-theme="light"] .resource-group,
[data-theme="light"] .tip-box,
[data-theme="light"] .search-group {
  background: #fff;
}

.detail-card {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.topic-chip {
  padding: 10px;
  border-radius: 10px;
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid var(--border);
}

.topic-chip strong {
  display: block;
  margin-bottom: 4px;
}

.topic-chip span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.path-card {
  border-left: 3px solid var(--accent);
}

.path-card__head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.path-card__num {
  font-family: var(--mono);
  color: var(--accent);
  font-weight: 700;
}

.checklist {
  margin: 10px 0;
  padding-left: 1.2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.lesson-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lesson-link {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(148, 163, 184, 0.05);
}

.lesson-link:hover,
.lesson-link.is-current {
  border-color: rgba(96, 165, 250, 0.45);
  background: rgba(59, 130, 246, 0.1);
}

.lesson-link.is-done {
  opacity: 0.7;
}

.lesson-link.is-done::after {
  content: "✓";
  color: var(--accent-green);
}

.doc-body {
  margin: 18px 0;
  color: var(--text-muted);
}

.doc-body h1,
.doc-body h2,
.doc-body h3 {
  color: var(--text);
}

.doc-body ul,
.doc-body ol {
  padding-left: 1.2rem;
}

.doc-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.tag {
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  font-size: 0.8rem;
  color: var(--accent);
}

.resource-list,
.search-results {
  list-style: none;
  margin: 0;
  padding: 0;
}

.resource-list a,
.search-results a {
  display: block;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}

.resource-list strong {
  display: block;
}

.resource-list span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.glossary-item h3 {
  margin: 0 0 6px;
  color: #93c5fd;
}

.glossary-search {
  margin-left: auto;
}

.related {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

/* Progress modal */
.progress-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: grid;
  place-items: center;
  z-index: 50;
  padding: 16px;
}

.progress-modal[hidden] {
  display: none;
}

.progress-modal__panel {
  width: min(420px, 100%);
  background: var(--bg-panel-solid);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.progress-modal__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-modal__head h2 {
  margin: 0;
}

.progress-modal__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 16px 0;
}

.progress-modal__stats div {
  text-align: center;
  padding: 12px 8px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(148, 163, 184, 0.06);
}

.progress-modal__stats span {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
}

.progress-modal__stats small {
  color: var(--text-dim);
}

/* Responsive */
@media (max-width: 1100px) {
  .overview-grid,
  .journey-projects {
    grid-template-columns: 1fr;
  }

  .journey-track {
    grid-template-columns: repeat(7, minmax(140px, 1fr));
  }
}

@media (max-width: 980px) {
  .sidebar {
    transform: translateX(-105%);
    transition: transform 0.2s ease;
  }

  .sidebar.is-open {
    transform: none;
  }

  .topbar {
    padding: 16px;
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "menu controls"
      "hero hero"
      "stats stats";
  }

  .menu-toggle {
    grid-area: menu;
  }

  .topbar__controls {
    justify-content: flex-end;
  }

  .stat-pills {
    justify-content: flex-start;
  }

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

  .stack-body {
    grid-template-columns: 1fr;
  }
}