/* ==========================================================================
   learn.leslieli.dev — The Audit Trail
   Design tokens shared with leslieli.dev (Zen Washi / Sumi Ink)
   ========================================================================== */

:root {
  --bg: #fafaf8;
  --bg-elevated: #ffffff;
  --bg-card: #f3f3ee;
  --bg-card-hover: #eaeae4;
  --bg-subtle: #f0f0eb;

  --ink: #18181b;
  --ink-secondary: #27272a;
  --muted: #71717a;
  --muted-light: #a1a1aa;

  --line: rgba(0, 0, 0, 0.06);
  --line-strong: rgba(0, 0, 0, 0.12);
  --line-glow: rgba(180, 83, 9, 0.18);

  --accent: #b45309;
  --accent-hover: #92400e;
  --accent-subtle: rgba(180, 83, 9, 0.08);
  --accent-cyan: #0284c7;
  --accent-cyan-subtle: rgba(2, 132, 199, 0.08);
  --success: #15803d;
  --success-subtle: rgba(21, 128, 61, 0.08);
  --danger: #b91c1c;
  --danger-subtle: rgba(185, 28, 28, 0.08);

  --font-display: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Newsreader", "Iowan Old Style", Palatino, serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  --measure: 64rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 250ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg: #09090b;
  --bg-elevated: #111114;
  --bg-card: #141418;
  --bg-card-hover: #1b1b22;
  --bg-subtle: #18181e;

  --ink: #f4f4f6;
  --ink-secondary: #d4d4d8;
  --muted: #828290;
  --muted-light: #52525b;

  --line: rgba(255, 255, 255, 0.06);
  --line-strong: rgba(255, 255, 255, 0.12);
  --line-glow: rgba(217, 119, 6, 0.2);

  --accent: #d97706;
  --accent-hover: #f59e0b;
  --accent-subtle: rgba(217, 119, 6, 0.1);
  --accent-cyan: #38bdf8;
  --accent-cyan-subtle: rgba(56, 189, 248, 0.1);
  --success: #10b981;
  --success-subtle: rgba(16, 185, 129, 0.1);
  --danger: #f87171;
  --danger-subtle: rgba(248, 113, 113, 0.1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0.75rem clamp(1rem, 3vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); }

.brand-monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--bg);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 400;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav a:hover { color: var(--ink); background: var(--bg-subtle); }
.nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-subtle);
}

.theme-toggle {
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--muted);
  border-radius: var(--radius-full);
  width: 32px;
  height: 32px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.theme-toggle:hover { color: var(--ink); border-color: var(--muted); }

/* ---------- Layout ---------- */

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1rem, 3vw, 2rem) 4rem;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0.25rem 0 0.35rem;
}

.page-subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 2rem;
  max-width: 46rem;
}

.section-heading {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2.25rem 0 0.85rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading .aside-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--muted-light);
}

/* ---------- Cards & grids ---------- */

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.3rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

.stat .stat-value {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.stat .stat-value .unit {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  margin-left: 0.2rem;
}
.stat .stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-top: 0.3rem;
}
.stat.accent .stat-value { color: var(--accent); }
.stat.success .stat-value { color: var(--success); }

.progress-bar {
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  overflow: hidden;
  margin-top: 0.6rem;
}
.progress-bar > span {
  display: block;
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  transition: width var(--transition-smooth);
}

.section-bars {
  display: grid;
  gap: 0.7rem;
}
.section-bar-row {
  display: grid;
  grid-template-columns: 12rem 1fr 3.5rem;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.85rem;
}
.section-bar-row .bar-label { color: var(--ink-secondary); }
.section-bar-row .bar-pct {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  text-align: right;
}
@media (max-width: 560px) {
  .section-bar-row { grid-template-columns: 8.5rem 1fr 3rem; }
}

/* ---------- Syllabus ---------- */

.clause-group {
  margin-bottom: 1rem;
}
.clause-group-head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}
.clause-group-head .group-pct {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--muted);
  margin-left: auto;
}

.topic-row {
  display: grid;
  grid-template-columns: 4.2rem 1fr 13rem auto;
  gap: 0.75rem;
  align-items: start;
  padding: 0.6rem 0.65rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.topic-row:hover { background: var(--bg-card); border-color: var(--line); }

.topic-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  padding-top: 0.35rem;
  white-space: nowrap;
}

.topic-title { font-size: 0.9rem; color: var(--ink-secondary); padding-top: 0.25rem; }

.topic-notes-toggle {
  background: none;
  border: none;
  color: var(--muted-light);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.25rem 0.4rem;
  border-radius: var(--radius-sm);
}
.topic-notes-toggle:hover { color: var(--accent); background: var(--accent-subtle); }

.level-picker {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
}
.level-pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.3rem 0.55rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.level-pill:hover { border-color: var(--accent); color: var(--accent); }
.level-pill.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
[data-theme="dark"] .level-pill.active { color: #09090b; }

.topic-notes {
  grid-column: 2 / -1;
  display: none;
  margin-top: 0.4rem;
}
.topic-notes.open { display: block; }
.topic-notes textarea {
  width: 100%;
  min-height: 4.5rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  border-radius: var(--radius-md);
}

@media (max-width: 640px) {
  .topic-row { grid-template-columns: 1fr; gap: 0.4rem; }
  .topic-code { padding-top: 0; }
  .topic-title { padding-top: 0; }
}

/* ---------- Forms ---------- */

input[type="text"], input[type="number"], input[type="date"], textarea, select {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--ink);
  background: var(--bg-elevated);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.7rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--ink);
  color: var(--bg);
}
.btn:hover { background: var(--ink-secondary); }
.btn.btn-ghost {
  background: transparent;
  color: var(--ink-secondary);
  border-color: var(--line-strong);
}
.btn.btn-ghost:hover { border-color: var(--muted); color: var(--ink); }
.btn:disabled { opacity: 0.55; cursor: default; }

.form-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  flex-wrap: wrap;
}
.form-row .field { display: flex; flex-direction: column; }
.form-row .field.grow { flex: 1 1 12rem; }

/* ---------- Tables & lists ---------- */

.session-list {
  display: grid;
  gap: 0.6rem;
}
.session-item {
  display: grid;
  grid-template-columns: 6.2rem 3.6rem 1fr auto;
  gap: 0.8rem;
  align-items: baseline;
  padding: 0.7rem 0.9rem;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
}
.session-date { font-family: var(--font-mono); font-size: 0.75rem; color: var(--muted); }
.session-minutes { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent); font-weight: 600; }
.session-topic { font-weight: 500; color: var(--ink-secondary); }
.session-notes-text { font-size: 0.8rem; color: var(--muted); margin-top: 0.15rem; }
.session-delete {
  background: none;
  border: none;
  color: var(--muted-light);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-sm);
}
.session-delete:hover { color: var(--danger); background: var(--danger-subtle); }

@media (max-width: 560px) {
  .session-item { grid-template-columns: 5.5rem 1fr auto; }
  .session-minutes { grid-column: 1; }
}

/* ---------- Checklists ---------- */

.checklist-card { margin-bottom: 1.25rem; }
.checklist-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.2rem;
}
.checklist-head h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
}
.checklist-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
}
.checklist-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 0.8rem;
}

.check-item {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  padding: 0.45rem 0.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.check-item:hover { background: var(--bg-subtle); }
.check-item input {
  margin-top: 0.32rem;
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}
.check-item .check-label { font-size: 0.88rem; color: var(--ink-secondary); }
.check-item.done .check-label { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--line-strong); }

/* ---------- Toast & misc ---------- */

.toast {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: var(--ink);
  color: var(--bg);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  opacity: 0;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
  pointer-events: none;
  z-index: 100;
  max-width: 90vw;
  text-align: center;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

.footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 3vw, 2rem) 2.5rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted-light);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.empty-state {
  color: var(--muted);
  font-size: 0.88rem;
  padding: 1rem 0;
}

.inline-date-edit {
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
}
.inline-date-edit input { padding: 0.3rem 0.5rem; font-size: 0.8rem; }