/* ============================================================
   teach-me portfolio hub — Editorial Minimal theme
   Deliberately distinct from any single course's visual identity.
   Black-on-cream, big serif headings, restrained accents.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400..900;1,400..900&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@500;700&display=swap');

:root {
  /* Color */
  --bg: #f7f4ec;                  /* warm off-white */
  --bg-subtle: #efeae0;            /* slightly deeper */
  --surface: #fdfbf5;              /* card surface */
  --text: #18171a;                 /* near-black, slightly warm */
  --text-muted: #6b6862;
  --line: #d8d2c4;
  --line-strong: #b9b1a0;
  --accent: #b35a3d;               /* warm terracotta — single accent for emphasis */
  --accent-dark: #8a3f27;
  --ink: #2a3658;                  /* second accent for links — ink-blue */
  --ink-dark: #182040;

  /* Type */
  --font-display: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Menlo', monospace;
  --size-base: 1.0625rem;
  --size-sm: 0.9rem;
  --size-xs: 0.78rem;
  --size-lg: 1.18rem;
  --size-h1: clamp(2.4rem, 1.6rem + 4vw, 4.5rem);
  --size-h2: clamp(1.6rem, 1.2rem + 1.6vw, 2.25rem);
  --size-h3: clamp(1.2rem, 1rem + 0.8vw, 1.5rem);
  --line-tight: 1.15;
  --line-body: 1.7;

  /* Layout */
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem;
  --space-4: 1rem; --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem; --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem; --space-20: 5rem; --space-24: 6rem;
  --measure: 64ch;
  --measure-narrow: 48ch;
  --measure-wide: 96ch;
  --tap: 44px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--font-body);
  font-size: var(--size-base); line-height: var(--line-body);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--line-tight);
  letter-spacing: -0.015em;
  margin: 0 0 var(--space-4);
}
h1 { font-size: var(--size-h1); font-weight: 600; }
h2 { font-size: var(--size-h2); }
h3 { font-size: var(--size-h3); }

p { margin: 0 0 var(--space-4); max-width: var(--measure); }
a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--line-strong);
  transition: text-decoration-color 0.15s ease;
}
a:hover { text-decoration-color: var(--accent); color: var(--accent-dark); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

::selection { background: var(--text); color: var(--bg); }

img { max-width: 100%; height: auto; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ============================================================
   Layout
   ============================================================ */

.shell {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: var(--space-12) var(--space-8);
}
@media (max-width: 720px) {
  .shell { padding: var(--space-8) var(--space-5); }
}

.site-header {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: var(--space-6) var(--space-8);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap; gap: var(--space-3);
}
.site-header__brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--size-lg);
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text);
}
.site-header__nav {
  display: flex; gap: var(--space-6); font-size: var(--size-sm);
}
.site-header__nav a {
  color: var(--text-muted);
  text-decoration: none;
}
.site-header__nav a:hover { color: var(--text); }

/* ============================================================
   Hero
   ============================================================ */

.hero {
  padding: var(--space-20) 0 var(--space-16);
  border-bottom: 1px solid var(--line);
  margin-bottom: var(--space-16);
}
.hero__kicker {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-dark);
  margin: 0 0 var(--space-4);
}
.hero__title {
  font-size: var(--size-h1);
  max-width: 16ch;
  margin: 0 0 var(--space-6);
}
.hero__tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.2rem, 1rem + 1vw, 1.6rem);
  color: var(--text-muted);
  max-width: 38ch;
  line-height: 1.4;
  margin: 0 0 var(--space-8);
}
.hero__bio {
  max-width: 56ch;
  font-size: var(--size-base);
  margin: 0;
}

/* ============================================================
   Course grid
   ============================================================ */

.section-label {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-dark);
  margin-bottom: var(--space-3);
  display: block;
}

.courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-8);
  margin: var(--space-8) 0 var(--space-16);
}

.course-card {
  display: flex; flex-direction: column;
  padding: var(--space-8);
  background: var(--surface);
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--text);
  position: relative;
  overflow: hidden;
  transition: transform 0.25s cubic-bezier(0.2, 0.7, 0.2, 1), border-color 0.2s ease, box-shadow 0.25s ease;
  min-height: 280px;
}
.course-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 18px 40px rgba(24,23,26,0.10);
}
.course-card__corner {
  display: block;
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  line-height: 1.5;
  color: var(--text-muted);
}
.course-card__emoji {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  display: block;
  line-height: 1;
}
.course-card__title {
  font-family: var(--font-display);
  font-size: var(--size-h3);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space-3);
  letter-spacing: -0.015em;
}
.course-card__tagline {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--text-muted);
  margin: 0 0 var(--space-5);
  flex: 1;
  font-size: var(--size-base);
}
.course-card__meta {
  display: flex; gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.course-card__cta {
  margin-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-dark);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.course-card__cta::after {
  content: "→";
  transition: transform 0.2s ease;
}
.course-card:hover .course-card__cta::after { transform: translateX(4px); }

/* "Coming soon" / placeholder cards */
.course-card--placeholder {
  border-style: dashed;
  background: transparent;
  color: var(--text-muted);
  pointer-events: none;
}
.course-card--placeholder .course-card__title { color: var(--text-muted); }

/* Status badges */
.badge {
  display: inline-block;
  padding: 2px 10px;
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  border-radius: 999px;
  border: 1px solid var(--line);
}
.badge--active { color: var(--accent-dark); border-color: var(--accent); background: rgba(179,90,61,0.08); }

/* ============================================================
   About / builder
   ============================================================ */

.about {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: var(--space-16) 0;
}
.about p { font-size: var(--size-lg); max-width: var(--measure); }
.about__links {
  display: flex; gap: var(--space-5);
  margin-top: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--size-sm);
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  padding: var(--space-12) var(--space-8) var(--space-16);
  border-top: 1px solid var(--line);
  font-size: var(--size-sm);
  color: var(--text-muted);
  display: flex; flex-wrap: wrap; gap: var(--space-4);
  justify-content: space-between;
  align-items: center;
}
.site-footer__links {
  display: flex; gap: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.site-footer a { color: var(--text-muted); text-decoration-color: var(--line); }
.site-footer a:hover { color: var(--text); text-decoration-color: var(--accent); }

/* Decorative rule */
.rule {
  display: block;
  width: 60px;
  height: 2px;
  background: var(--accent);
  border: none;
  margin: var(--space-8) 0;
}