/* ============================================================
   CAPPUCCINO — Neobrutalist Bento Learning Platform
   Global Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700;800&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Variables ──────────────────────────────────────────── */
:root {
  --black:   #0A0A0A;
  --white:   #FAFAFA;
  --off:     #F2F0E8;

  /* Category colours */
  --yellow:  #FFE500;
  --coral:   #FF4D4D;
  --blue:    #4D79FF;
  --green:   #00E676;
  --purple:  #B84DFF;
  --orange:  #FF8C4D;
  --pink:    #FF4DB8;
  --teal:    #00D4AA;

  --border:    2.5px solid var(--black);
  --shadow:    4px 4px 0 var(--black);
  --shadow-lg: 7px 7px 0 var(--black);
  --shadow-sm: 2px 2px 0 var(--black);
  --radius:    3px;
  --gap:       14px;

  /* Claude chat CSS variable bridge — makes Claude-generated
     lesson HTML render correctly without editing those files. */
  --color-background-primary:   #FAFAFA;
  --color-background-secondary: #F2F0E8;
  --color-background-tertiary:  #E8E5DC;
  --color-text-primary:         #0A0A0A;
  --color-text-secondary:       #3A3A3A;
  --color-text-tertiary:        #777777;
  --color-border-secondary:     #BBBBBB;
  --color-border-tertiary:      #E0DDD5;
  --border-radius-sm:           2px;
  --border-radius-md:           3px;
  --border-radius-lg:           4px;
  --font-sans:                  'Inter', system-ui, sans-serif;

  --font-head: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--off);
  color: var(--black);
  min-height: 100vh;
  padding-bottom: 80px; /* dock clearance on mobile */
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── Typography ─────────────────────────────────────────── */
h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 800; line-height: 1.1; }

/* ── Utility ────────────────────────────────────────────── */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-head);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border: 2px solid var(--black);
  border-radius: 2px;
  box-shadow: var(--shadow-sm);
  background: var(--yellow);
  white-space: nowrap;
}
.tag.cat-programming  { background: var(--blue);   color: var(--white); }
.tag.cat-design       { background: var(--pink);   color: var(--white); }
.tag.cat-data-science { background: var(--purple); color: var(--white); }
.tag.cat-devtools     { background: var(--teal);   color: var(--black); }
.tag.cat-mathematics  { background: var(--coral);  color: var(--white); }
.tag.cat-economics    { background: var(--orange); color: var(--black); }
.tag.cat-general      { background: var(--yellow); color: var(--black); }

.badge-diff {
  font-size: 0.65rem;
  font-family: var(--font-head);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1.5px solid currentColor;
}
.diff-beginner     { color: #1a7a3c; background: #d4fce4; }
.diff-intermediate { color: #7a5c1a; background: #fcefd4; }
.diff-advanced     { color: #7a1a1a; background: #fcd4d4; }

/* ── Site Header ────────────────────────────────────────── */
.site-header {
  background: var(--yellow);
  border-bottom: var(--border);
  padding: 0 var(--gap);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 58px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  white-space: nowrap;
}
.site-logo span { opacity: 0.45; font-weight: 500; }

.header-search {
  flex: 1;
  max-width: 420px;
  position: relative;
}

.header-search input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.875rem;
  padding: 8px 12px 8px 36px;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  outline: none;
  transition: box-shadow 0.1s;
}
.header-search input:focus { box-shadow: var(--shadow); }

.header-search::before {
  content: '⌕';
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  opacity: 0.5;
  pointer-events: none;
}

.header-actions {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.82rem;
  padding: 8px 16px;
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 0.08s, box-shadow 0.08s;
  background: var(--white);
  white-space: nowrap;
}
.btn:hover  { transform: translate(-2px,-2px); box-shadow: var(--shadow); }
.btn:active { transform: translate(1px,1px);   box-shadow: var(--shadow-sm); }
.btn-primary { background: var(--black); color: var(--white); }

/* ── Page Wrapper ───────────────────────────────────────── */
.page-wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--gap);
}

/* ── Catalogue Hero ─────────────────────────────────────── */
.cat-hero {
  margin-bottom: var(--gap);
  padding: 24px 28px;
  background: var(--black);
  color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.cat-hero h1 { font-size: clamp(1.6rem, 4vw, 2.6rem); line-height: 1; }
.cat-hero h1 em { color: var(--yellow); font-style: normal; }
.cat-hero p  { margin-top: 8px; font-size: 0.9rem; opacity: 0.65; max-width: 420px; }

.cat-hero-stats {
  display: flex;
  gap: 24px;
}
.hero-stat { text-align: center; }
.hero-stat strong {
  display: block;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  color: var(--yellow);
}
.hero-stat span { font-size: 0.75rem; opacity: 0.5; text-transform: uppercase; letter-spacing: 0.07em; }

/* ── Category Filter Bar ────────────────────────────────── */
.cat-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: var(--gap);
}

.filter-btn {
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 14px;
  border: var(--border);
  border-radius: 999px;
  background: var(--white);
  cursor: pointer;
  transition: transform 0.08s, box-shadow 0.08s, background 0.08s;
  box-shadow: var(--shadow-sm);
}
.filter-btn:hover  { transform: translate(-1px,-1px); box-shadow: var(--shadow); }
.filter-btn.active { background: var(--black); color: var(--white); }

/* ── Bento Grid ─────────────────────────────────────────── */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap);
  align-items: start;
}

/* Span helpers */
.span-8  { grid-column: span 8; }
.span-7  { grid-column: span 7; }
.span-6  { grid-column: span 6; }
.span-5  { grid-column: span 5; }
.span-4  { grid-column: span 4; }
.span-3  { grid-column: span 3; }
.span-2  { grid-column: span 2; }
.span-12 { grid-column: span 12; }
.row-2   { grid-row: span 2; }

/* ── Lesson Card ────────────────────────────────────────── */
.lesson-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.1s, box-shadow 0.1s;
  cursor: pointer;
  min-height: 180px;
}
.lesson-card:hover  { transform: translate(-3px,-3px); box-shadow: var(--shadow-lg); }
.lesson-card:active { transform: translate(2px,2px);   box-shadow: var(--shadow-sm); }

.lesson-card.featured { min-height: 320px; }

/* Coloured top stripe */
.card-stripe {
  height: 10px;
  flex-shrink: 0;
}

.card-body {
  flex: 1;
  padding: 18px 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.card-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.lesson-card.featured .card-title { font-size: 1.5rem; }

.card-desc {
  font-size: 0.83rem;
  color: #444;
  line-height: 1.55;
  flex: 1;
}

.card-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1.5px solid #e0ddd5;
  font-size: 0.78rem;
  color: #666;
  font-family: var(--font-head);
  font-weight: 600;
}

.card-footer-left  { display: flex; align-items: center; gap: 10px; }
.card-progress-bar {
  height: 5px;
  background: #e0ddd5;
  border-radius: 999px;
  overflow: hidden;
  width: 72px;
}
.card-progress-fill {
  height: 100%;
  background: var(--black);
  border-radius: 999px;
  transition: width 0.3s;
}

.card-arrow {
  font-size: 1rem;
  transition: transform 0.1s;
}
.lesson-card:hover .card-arrow { transform: translateX(3px); }

/* ── Stat Card ──────────────────────────────────────────── */
.stat-card {
  background: var(--yellow);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-card .stat-num {
  font-family: var(--font-head);
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
}
.stat-card .stat-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  opacity: 0.6;
}

/* ── Quote / Tip Card ───────────────────────────────────── */
.tip-card {
  background: var(--black);
  color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tip-card .tip-icon { font-size: 2rem; }
.tip-card .tip-text {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}
.tip-card .tip-sub { font-size: 0.78rem; opacity: 0.5; }

/* ── Continue Card ──────────────────────────────────────── */
.continue-card {
  background: var(--green);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
}
.continue-card:hover  { transform: translate(-3px,-3px); box-shadow: var(--shadow-lg); }
.continue-card:active { transform: translate(2px,2px);   box-shadow: var(--shadow-sm); }
.continue-card .cc-label {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.6;
}
.continue-card .cc-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.2;
}
.continue-card .cc-progress {
  height: 6px;
  background: rgba(0,0,0,0.15);
  border-radius: 999px;
  overflow: hidden;
}
.continue-card .cc-fill {
  height: 100%;
  background: var(--black);
  border-radius: 999px;
}

/* ── Section Heading ────────────────────────────────────── */
.section-heading {
  grid-column: span 12;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-top: 6px;
}
.section-heading h2 {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.section-heading a {
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── Mobile Dock ────────────────────────────────────────── */
.dock {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--white);
  border-top: var(--border);
  box-shadow: 0 -4px 0 var(--black);
  z-index: 200;
  padding: 6px 0 env(safe-area-inset-bottom, 6px);
}

.dock-inner {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.dock-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: background 0.1s;
  min-width: 60px;
}
.dock-item:active { background: var(--off); }
.dock-icon { font-size: 1.3rem; line-height: 1; }
.dock-label {
  font-family: var(--font-head);
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.5;
}
.dock-item.active .dock-label { opacity: 1; }
.dock-item.active .dock-icon { filter: drop-shadow(0 0 0 var(--black)); }

.dock-pip {
  width: 5px; height: 5px;
  border-radius: 999px;
  background: var(--black);
  margin-top: 2px;
}

/* ── Search Overlay ─────────────────────────────────────── */
#search-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10,10,10,0.6);
  z-index: 300;
  padding: 16px;
  align-items: flex-start;
  justify-content: center;
  padding-top: 80px;
}
#search-overlay.open { display: flex; }

.search-modal {
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 560px;
  overflow: hidden;
}

.search-modal input {
  width: 100%;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  padding: 18px 20px;
  border: none;
  border-bottom: var(--border);
  background: var(--off);
  outline: none;
}

.search-results {
  max-height: 360px;
  overflow-y: auto;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  border-bottom: 1.5px solid #e0ddd5;
  cursor: pointer;
  transition: background 0.08s;
}
.search-result-item:hover { background: var(--off); }
.search-result-item:last-child { border-bottom: none; }

.sri-icon {
  width: 40px; height: 40px;
  border: var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.sri-title { font-family: var(--font-head); font-weight: 700; font-size: 0.9rem; }
.sri-meta  { font-size: 0.75rem; color: #666; margin-top: 2px; }

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .span-8  { grid-column: span 7; }
  .span-5  { grid-column: span 5; }
  .span-4  { grid-column: span 6; }
  .span-3  { grid-column: span 4; }
  .span-2  { grid-column: span 3; }
}

@media (max-width: 768px) {
  :root { --gap: 10px; }

  body { padding-bottom: 72px; }

  .dock { display: block; }

  .header-search { display: none; }

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

  .span-12, .span-8, .span-7, .span-6 { grid-column: span 2; }
  .span-5, .span-4, .span-3 { grid-column: span 1; }
  .span-2 { grid-column: span 1; }
  .row-2  { grid-row: span 1; }

  .lesson-card.featured { min-height: 220px; }

  .cat-hero { flex-direction: column; align-items: flex-start; gap: 16px; }
  .cat-hero-stats { gap: 16px; }

  .section-heading { grid-column: span 2; }
}

@media (max-width: 420px) {
  .bento-grid { grid-template-columns: 1fr; }
  .span-12, .span-8, .span-7, .span-6,
  .span-5, .span-4, .span-3, .span-2 { grid-column: span 1; }
  .section-heading { grid-column: span 1; }
}