:root {
  --ink: #0e1210;
  --ink-2: #161c19;
  --ink-3: #1e2722;
  --panel: #141a17;
  --line: rgba(214, 228, 214, 0.1);
  --line-strong: rgba(214, 228, 214, 0.18);
  --fog: #9aaba0;
  --mist: #c5d2c8;
  --paper: #e8efe8;
  --accent: #c4f082;
  --accent-dim: #8fb85a;
  --warm: #e8b86d;
  --done: #6ecf9a;
  --danger: #e07a6a;
  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Sora", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sidebar: 300px;
  --radius: 10px;
}

.lock {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(900px 500px at 20% 0%, rgba(196, 240, 130, 0.1), transparent 55%),
    var(--ink);
}

.lock[hidden] {
  display: none;
}

.lock-card {
  width: min(100%, 380px);
  padding: 28px 24px;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: var(--panel);
}

.lock-brand {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.6rem;
  color: var(--paper);
}

.lock-card h1 {
  margin: 8px 0 0;
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--warm);
}

.lock-copy {
  margin: 12px 0 18px;
  color: var(--fog);
  font-size: 0.92rem;
}

#lock-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#lock-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--ink-2);
  color: var(--paper);
  outline: none;
}

#lock-input:focus {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line-strong));
}

.lock-error {
  margin: 10px 0 0;
  color: var(--danger);
  font-size: 0.85rem;
}

#app[hidden] {
  display: none;
}



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

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(196, 240, 130, 0.08), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(232, 184, 109, 0.06), transparent 50%),
    var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
}

button,
input {
  font: inherit;
}

a {
  color: var(--accent);
}

.app {
  display: grid;
  grid-template-columns: var(--sidebar) 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px 14px 16px;
  background: color-mix(in srgb, var(--panel) 92%, black);
  border-right: 1px solid var(--line);
  overflow: hidden;
}

.brand {
  padding: 4px 8px 8px;
}

.brand-mark {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.85rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.brand-sub {
  margin: 6px 0 0;
  color: var(--fog);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.sidebar-tools {
  padding: 0 6px;
}

#search {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--ink-2);
  color: var(--paper);
  outline: none;
}

#search:focus {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line-strong));
}

.progress-line {
  margin-top: 12px;
  height: 4px;
  border-radius: 999px;
  background: var(--ink-3);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 200ms ease;
}

.progress-label {
  margin: 8px 0 0;
  color: var(--fog);
  font-size: 0.75rem;
}

.nav {
  flex: 1;
  overflow: auto;
  padding: 4px 4px 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-3) transparent;
}

.phase {
  margin-bottom: 14px;
}

.phase-title {
  margin: 0 0 6px;
  padding: 0 8px;
  color: var(--warm);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lesson-link {
  display: grid;
  grid-template-columns: 16px 1fr;
  gap: 8px;
  align-items: start;
  width: 100%;
  margin: 0 0 2px;
  padding: 8px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--mist);
  text-align: left;
  cursor: pointer;
}

.lesson-link:hover {
  background: rgba(232, 239, 232, 0.05);
  color: var(--paper);
}

.lesson-link.active {
  background: rgba(196, 240, 130, 0.12);
  color: var(--paper);
}

.lesson-link.done .check {
  color: var(--done);
}

.check {
  margin-top: 2px;
  color: var(--fog);
  font-size: 0.75rem;
}

.lesson-link .label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.lesson-link .name {
  font-size: 0.86rem;
  font-weight: 500;
  line-height: 1.3;
}

.lesson-link .meta {
  color: var(--fog);
  font-size: 0.7rem;
}

.sidebar-foot {
  display: flex;
  gap: 8px;
  padding: 8px 6px 0;
  border-top: 1px solid var(--line);
}

.main-wrap {
  min-width: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 22px;
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.crumbs {
  flex: 1;
  min-width: 0;
  color: var(--fog);
  font-size: 0.82rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.top-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.menu-btn {
  display: none;
}

.ghost,
.secondary,
.primary {
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  border: 1px solid transparent;
}

.ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--mist);
}

.ghost:hover:not(:disabled) {
  background: rgba(232, 239, 232, 0.06);
  color: var(--paper);
}

.ghost:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.secondary {
  background: var(--ink-3);
  border-color: var(--line-strong);
  color: var(--paper);
}

.primary {
  background: var(--accent);
  color: #142016;
  font-weight: 600;
  border-color: color-mix(in srgb, var(--accent) 70%, black);
}

.primary:hover {
  filter: brightness(1.05);
}

.primary.done-state {
  background: transparent;
  color: var(--done);
  border-color: color-mix(in srgb, var(--done) 45%, var(--line));
}

.main {
  padding: 28px 28px 80px;
  max-width: 920px;
}

.home-hero {
  margin-bottom: 36px;
  padding: 8px 0 8px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-dim);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.home-hero h1 {
  margin: 0;
  max-width: 16ch;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.lede {
  margin: 18px 0 0;
  max-width: 52ch;
  color: var(--fog);
  font-size: 1.05rem;
}

.home-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.phase-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(30, 39, 34, 0.9), rgba(14, 18, 16, 0.55));
  text-align: left;
  color: inherit;
  cursor: pointer;
}

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

.phase-card .num {
  color: var(--warm);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.phase-card h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 400;
}

.phase-card p {
  margin: 0;
  color: var(--fog);
  font-size: 0.84rem;
}

.phase-card .count {
  margin-top: auto;
  padding-top: 8px;
  color: var(--mist);
  font-size: 0.75rem;
}

.serve-note {
  padding: 14px 16px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  color: var(--fog);
  font-size: 0.86rem;
  background: rgba(20, 26, 23, 0.65);
}

.serve-note code {
  font-family: var(--mono);
  font-size: 0.8em;
  color: var(--accent);
}

.reader-meta {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--fog);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.reader-meta span:first-child {
  color: var(--accent-dim);
}

.prose {
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--paper);
}

.prose > :first-child {
  margin-top: 0;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--paper);
}

.prose h1 {
  font-size: 2.4rem;
  margin: 0 0 1rem;
}

.prose h2 {
  font-size: 1.7rem;
  margin: 2.2rem 0 0.8rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--line);
}

.prose h3 {
  font-size: 1.3rem;
  margin: 1.6rem 0 0.6rem;
}

.prose p,
.prose li {
  color: var(--mist);
}

.prose strong {
  color: var(--paper);
  font-weight: 600;
}

.prose a {
  color: var(--accent);
}

.prose blockquote {
  margin: 1.2rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--accent-dim);
  color: var(--mist);
}

.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--ink-3);
  padding: 0.12em 0.35em;
  border-radius: 4px;
}

.prose pre {
  margin: 1.2rem 0;
  padding: 14px 16px;
  overflow: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0b0f0d;
}

.prose pre code {
  background: transparent;
  padding: 0;
  font-size: 0.84rem;
  line-height: 1.55;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.92rem;
}

.prose th,
.prose td {
  border: 1px solid var(--line-strong);
  padding: 8px 10px;
  text-align: left;
}

.prose th {
  background: var(--ink-3);
  color: var(--paper);
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

.reader-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.error {
  padding: 40px 0;
}

.error h2 {
  font-family: var(--serif);
  font-weight: 400;
}

.backdrop {
  display: none;
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
  }

  .backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 15;
    background: rgba(0, 0, 0, 0.55);
  }

  .backdrop[hidden] {
    display: none;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(88vw, 320px);
    z-index: 20;
    transform: translateX(-105%);
    transition: transform 180ms ease;
    padding-top: max(16px, env(safe-area-inset-top));
    padding-bottom: max(12px, env(safe-area-inset-bottom));
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .menu-btn {
    display: inline-flex;
    min-height: 40px;
    min-width: 40px;
    align-items: center;
    justify-content: center;
  }

  .topbar {
    padding: 10px 14px;
    padding-top: max(10px, env(safe-area-inset-top));
    gap: 8px;
  }

  .top-actions {
    gap: 6px;
  }

  .top-actions .ghost,
  .top-actions .primary {
    padding: 8px 10px;
    font-size: 0.82rem;
  }

  .main {
    padding: 20px 16px 88px;
    padding-bottom: max(88px, calc(72px + env(safe-area-inset-bottom)));
  }

  .home-hero h1 {
    max-width: none;
    font-size: clamp(2rem, 9vw, 2.8rem);
  }

  .lesson-link {
    padding: 10px 8px;
    min-height: 44px;
  }

  .ghost,
  .secondary,
  .primary {
    min-height: 40px;
  }

  .reader-footer {
    flex-direction: column;
  }

  .reader-footer .secondary,
  .reader-footer .primary {
    width: 100%;
  }

  .prose {
    font-size: 1.05rem;
    overflow-wrap: anywhere;
  }

  .prose pre {
    max-width: 100%;
    -webkit-overflow-scrolling: touch;
  }

  .prose table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}