/* Shared curriculum chrome — colors come from the site theme. */
@import "/theme/tokens.css";
@import "/theme/editorial.css";
@import "/theme/palettes.css";
@import "/theme/curriculum-editorial.css";
@import "/theme/course-search.css";

:root {
  --bg: var(--color-bg);
  --surface: var(--color-surface);
  --surface-2: var(--color-surface-raised);
  --sunken: var(--color-surface-sunken);
  --text: var(--color-text);
  --muted: var(--color-text-muted);
  --accent: var(--color-accent);
  --good: var(--color-success);
  --bad: var(--color-danger);
  --warn: var(--color-warning);
  --border: var(--color-border);
  --focus: var(--color-focus);
  --font: Verdana, Geneva, sans-serif;
  --mono: Consolas, "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -100px;
  background: var(--focus);
  color: var(--color-focus-ink);
  padding: 0.5rem 0.85rem;
  font-weight: 700;
  z-index: 1000;
  border-radius: 4px;
}

.skip-link:focus {
  top: 0.75rem;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

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

.nav {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
}

main:focus {
  outline: none;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 4rem;
}

h1,
h2,
h3 {
  line-height: 1.25;
  font-weight: 650;
}

h1 {
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.1rem;
  margin: 1.25rem 0 0.5rem;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 65ch;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

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

@media (min-width: 800px) {
  .grid.two {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
}

.card h2,
.card h3 {
  margin-top: 0;
  border: 0;
  padding: 0;
}

.lesson-list {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 0;
  display: grid;
  gap: 0.75rem;
}

.lesson-list a {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.95rem 1.1rem;
}

.lesson-list a:hover {
  border-color: var(--accent);
}

.lesson-list .num {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
}

.lesson-list .title {
  display: block;
  font-weight: 650;
  margin: 0.2rem 0;
}

.lesson-list .desc {
  color: var(--muted);
  font-size: 0.92rem;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
}

.badge.bad {
  background: color-mix(in srgb, var(--bad) 20%, transparent);
  color: var(--color-badge-danger);
}

.badge.good {
  background: color-mix(in srgb, var(--good) 18%, transparent);
  color: var(--color-badge-success);
}

.badge.wcag {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--color-badge-accent);
}

.compare {
  display: grid;
  gap: 1rem;
}

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

.panel {
  border-radius: 10px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--surface);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.7rem 0.9rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-weight: 650;
}

.panel-body {
  padding: 1rem;
}

.panel.bad {
  border-color: color-mix(in srgb, var(--bad) 45%, var(--border));
}

.panel.good {
  border-color: color-mix(in srgb, var(--good) 45%, var(--border));
}

.callout {
  border-left: 4px solid var(--accent);
  background: var(--surface);
  padding: 0.85rem 1rem;
  margin: 1rem 0;
  border-radius: 0 8px 8px 0;
}

.callout.warn {
  border-left-color: var(--warn);
}

.callout.tip {
  border-left-color: var(--good);
}

pre,
code {
  font-family: var(--mono);
}

pre code {
  color: inherit;
  background: transparent;
}

pre {
  background: var(--color-code-bg);
  color: var(--color-code-fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
}

.checklist {
  list-style: none;
  padding: 0;
}

.checklist li {
  margin: 0.45rem 0;
  padding-left: 1.6rem;
  position: relative;
}

.checklist li::before {
  content: "☐";
  position: absolute;
  left: 0;
}

.def-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.5rem 0 1.25rem;
  font-size: 0.95rem;
}

.def-table th,
.def-table td {
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  padding: 0.65rem 0.55rem;
}

.def-table th {
  width: 13.5rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 650;
}

.def-table code {
  font-size: 0.84em;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.pager a {
  text-decoration: none;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.85rem;
  color: var(--text);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.playground-open {
  margin: 1.25rem 0 0;
}

.playground-open a {
  display: inline-block;
  text-decoration: none;
  background: var(--color-accent-fill);
  color: var(--color-contrast);
  font-weight: 700;
  border-radius: 8px;
  padding: 0.55rem 0.85rem;
}

.demo-box {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 1rem;
  background: var(--sunken);
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

kbd {
  font-family: var(--mono);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.05rem 0.35rem;
  font-size: 0.85em;
}

.lesson-list a:focus-visible {
  border-color: var(--accent);
}

.part-heading {
  margin-top: 2rem;
}

@media (forced-colors: active) {
  .badge,
  .panel,
  .callout,
  .lesson-list a {
    border: 1px solid CanvasText;
  }
}

.lesson-toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  max-width: 65ch;
}

.lesson-toc-title {
  margin: 0 0 0.35rem;
  font-weight: 650;
  font-size: 0.9rem;
}

.lesson-toc ul {
  margin: 0;
  padding-left: 1.2rem;
}

.progress-box {
  margin-top: 2rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.progress-box label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 24px;
  cursor: pointer;
}

.progress-box input {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--accent);
}

.progress-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.progress-summary progress {
  width: 10rem;
  max-width: 40%;
  accent-color: var(--accent);
}

.done-tag {
  margin-left: 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-badge-success);
}

.done-tag::before {
  content: "✓ ";
}

/* ==========================================================================
   Lesson components (visual, beginner-first style, mirrors the database course)
   hero → .in-one-minute → .key → numbered .lesson-section → labs → .mistakes → .recap
   ========================================================================== */
.hero { padding-left: 1rem; border-left: 4px solid var(--accent); margin-bottom: 1.25rem; }
.hero .meta { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.03em; margin: 0 0 0.35rem; }
.hero h1 { margin-bottom: 0.5rem; }
.hero .lead { margin: 0; }

.in-one-minute {
  display: grid; gap: 0.6rem; margin: 1rem 0 1.5rem; padding: 1rem 1.15rem;
  background: color-mix(in srgb, var(--accent) 9%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border)); border-radius: 12px;
}
.in-one-minute h2 { margin: 0; padding: 0; border: 0; font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.in-one-minute ul { margin: 0; padding-left: 1.2rem; }
.in-one-minute li { margin: 0.25rem 0; }

.key {
  display: grid; grid-template-columns: auto 1fr; gap: 0.2rem 0.8rem; align-items: start;
  padding: 0.85rem 1rem; margin: 1rem 0; border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
}
.key > .key-icon { grid-row: span 2; display: grid; place-items: center; width: 1.9rem; height: 1.9rem; border-radius: 0.55rem; background: var(--color-accent-fill, var(--accent)); color: var(--color-contrast, #fff); font-weight: 800; }
.key strong { font-size: 0.95rem; }
.key p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.key.warn { background: color-mix(in srgb, var(--warn) 10%, var(--surface)); border-color: color-mix(in srgb, var(--warn) 40%, var(--border)); }
.key.warn > .key-icon { background: var(--warn); color: #000; }

.lesson-section { margin: 2rem 0; }
.lesson-section > h2 { counter-increment: sec; display: flex; align-items: baseline; gap: 0.6rem; }
.lesson-section > h2::before { content: ""; flex: none; width: 0.6rem; height: 0.6rem; border-radius: 0.15rem; background: var(--accent); transform: translateY(-0.08rem); }
.lesson-section p, .lesson-section li { max-width: 72ch; }

/* Labs */
.stage { display: grid; gap: 0.85rem; padding: 1rem; margin: 1rem 0; border: 1px solid var(--border); border-radius: 14px; background: var(--sunken); }
.stage .kicker { margin: 0; font-size: 0.82rem; color: var(--muted); }
.stage .kicker strong { color: var(--text); }
.stage pre { margin: 0; }
.stage-cols { display: grid; gap: 0.9rem; }
@media (min-width: 800px) { .stage-cols { grid-template-columns: 1fr 1fr; } }
.stage-box { border: 1px solid var(--border); border-radius: 10px; background: var(--surface); padding: 0.85rem; min-width: 0; }
.stage-box > h3 { margin: 0 0 0.5rem; font-size: 0.95rem; }

.seg { display: inline-flex; flex-wrap: wrap; gap: 0.25rem; padding: 0.25rem; border: 1px solid var(--border); border-radius: 0.8rem; background: var(--surface); width: fit-content; max-width: 100%; }
.seg button { padding: 0.5rem 0.85rem; min-height: 44px; border: 0; border-radius: 0.55rem; background: transparent; color: var(--muted); font: inherit; font-size: 0.9rem; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--surface-2); color: var(--text); font-weight: 700; box-shadow: inset 0 0 0 2px var(--accent); }
.seg button:hover { color: var(--text); }

.lab-btn { font: inherit; color: var(--text); background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.5rem 0.9rem; min-height: 44px; cursor: pointer; }
.lab-btn:hover { border-color: var(--accent); }

.verdict { display: flex; align-items: flex-start; gap: 0.7rem; padding: 0.8rem 0.95rem; border-radius: 10px; font-weight: 650; border: 1px solid var(--border); background: var(--surface); }
.verdict > .verdict-mark { flex: none; font-size: 1.3rem; line-height: 1.2; }
.verdict small { display: block; margin-top: 0.2rem; font-weight: 400; color: var(--muted); font-size: 0.88rem; }
.verdict.is-good { background: color-mix(in srgb, var(--good) 14%, var(--surface)); border-color: color-mix(in srgb, var(--good) 50%, var(--border)); }
.verdict.is-bad { background: color-mix(in srgb, var(--bad) 12%, var(--surface)); border-color: color-mix(in srgb, var(--bad) 50%, var(--border)); }
.verdict.is-warn { background: color-mix(in srgb, var(--warn) 14%, var(--surface)); border-color: color-mix(in srgb, var(--warn) 50%, var(--border)); }

/* "What a screen reader announces" readout */
.sr-readout { font-family: var(--mono); font-size: 0.88rem; padding: 0.7rem 0.9rem; border-radius: 8px; background: var(--color-code-bg); color: var(--color-code-fg); border: 1px solid var(--border); }
.sr-readout::before { content: "🔊 Screen reader says: "; font-family: var(--font); font-weight: 700; opacity: 0.85; }

/* Pass/fail legend chips */
.chip { display: inline-block; padding: 0.1rem 0.5rem; border-radius: 999px; font-size: 0.78rem; font-weight: 700; border: 1px solid var(--border); background: var(--surface); }
.chip.good { background: color-mix(in srgb, var(--good) 16%, var(--surface)); color: var(--color-badge-success); }
.chip.bad { background: color-mix(in srgb, var(--bad) 16%, var(--surface)); color: var(--color-badge-danger); }

/* Step-by-step flow */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 1rem 0; display: grid; gap: 0.6rem; }
.steps > li { counter-increment: step; position: relative; padding: 0.7rem 0.9rem 0.7rem 3rem; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; }
.steps > li::before { content: counter(step); position: absolute; left: 0.8rem; top: 0.7rem; width: 1.6rem; height: 1.6rem; display: grid; place-items: center; border-radius: 50%; background: var(--color-accent-fill, var(--accent)); color: var(--color-contrast, #fff); font-weight: 800; font-size: 0.85rem; }

/* Quick reference / mistakes tables */
.mistakes { width: 100%; border-collapse: collapse; margin: 0.75rem 0 1.25rem; font-size: 0.93rem; }
.mistakes caption { text-align: left; font-weight: 650; padding-bottom: 0.4rem; }
.mistakes th, .mistakes td { text-align: left; vertical-align: top; padding: 0.6rem 0.6rem; border-bottom: 1px solid var(--border); }
.mistakes thead th { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.mistakes .no { color: var(--color-badge-danger); }
.mistakes .yes { color: var(--color-badge-success); }
.table-wrap { overflow-x: auto; }

.recap { margin: 2rem 0 1rem; padding: 1rem 1.15rem; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.recap h2 { margin: 0 0 0.5rem; padding: 0; border: 0; font-size: 1.05rem; }
.recap ul { margin: 0; padding-left: 1.2rem; }

.try-it { border-left: 4px solid var(--good); background: var(--surface); padding: 0.85rem 1rem; margin: 1rem 0; border-radius: 0 10px 10px 0; }
.try-it strong { display: block; margin-bottom: 0.25rem; }
.try-it ol { margin: 0.3rem 0 0; padding-left: 1.2rem; }

/* Index: course map */
.course-map { display: grid; gap: 0.6rem; margin: 1rem 0 1.5rem; }
@media (min-width: 800px) { .course-map { grid-template-columns: repeat(3, 1fr); } }
.course-map > div { padding: 0.85rem 1rem; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.course-map strong { display: block; color: var(--accent); font-family: var(--mono); font-size: 0.8rem; margin-bottom: 0.2rem; }

@media (forced-colors: active) {
  .key, .stage, .verdict, .steps > li, .in-one-minute, .recap, .seg button[aria-pressed="true"] { border: 1px solid CanvasText; }
}