/* ============================================================
   Learnillion — Public catalog (browse + skill paths) styles
   Blinkist-inspired: warm cream background, serif headlines,
   soft cards, pill filters, icon-forward skill path badges.
   ============================================================ */

:root {
  --l-bg: #f7f5f0;
  --l-card: #ffffff;
  --l-bg-soft: #faf8f3;
  --l-ink: #1a1d29;
  --l-ink-dim: #6b7280;
  --l-ink-soft: #9ca3af;
  --l-accent: #0365f2;
  --l-accent-soft: #e3edfd;
  --l-border: #e5e7eb;
  --l-border-soft: #f0edE8;
  --l-ok: #059669;
  --l-ok-soft: #d1fae5;
  --l-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --l-shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
  --l-shadow-lg: 0 12px 30px -8px rgba(15, 23, 42, 0.12);
  --l-shadow-hover: 0 20px 48px -16px rgba(15, 23, 42, 0.18);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--l-bg);
  color: var(--l-ink);
  font-family: 'Inter', sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--l-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============ TOP NAV ============ */
.site-nav {
  background: white;
  border-bottom: 1px solid var(--l-border);
  position: sticky; top: 0; z-index: 10;
}
.site-nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 16px 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.site-brand {
  display: flex; align-items: center; gap: 8px;
  font-family: 'Source Serif 4', serif; font-weight: 600;
  font-size: 20px; color: var(--l-ink);
  text-decoration: none;
}
.site-brand:hover { text-decoration: none; }
.site-brand .dot {
  width: 10px; height: 10px; background: var(--l-accent);
  border-radius: 50%;
}
.site-nav-links {
  display: flex; align-items: center; gap: 4px;
  flex-wrap: wrap;
}
.site-nav-links a {
  font-size: 14px; font-weight: 500;
  color: var(--l-ink-dim);
  padding: 8px 14px; border-radius: 8px;
  transition: all 0.15s;
}
.site-nav-links a:hover { color: var(--l-ink); background: var(--l-bg-soft); text-decoration: none; }
.site-nav-links a.active { color: var(--l-accent); background: var(--l-accent-soft); }

/* ============ PAGE WRAPPER ============ */
.catalog-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

.page-hero {
  text-align: left;
  margin-bottom: 40px;
}
.page-hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.18em;
  color: var(--l-accent); font-weight: 600;
  text-transform: uppercase; margin-bottom: 14px;
}
.page-hero .eyebrow::before {
  content: ''; width: 6px; height: 6px;
  background: var(--l-accent); border-radius: 50%;
}
.page-hero h1 {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--l-ink);
  max-width: 800px;
}
.page-hero .subtitle {
  margin-top: 14px;
  color: var(--l-ink-dim);
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.5;
  max-width: 640px;
  font-family: 'Source Serif 4', serif;
}

/* ============ FILTER BAR ============ */
.filter-bar {
  display: flex; flex-direction: column; gap: 16px;
  margin-bottom: 32px;
}
.filter-search {
  position: relative;
}
.filter-search input {
  width: 100%;
  padding: 14px 18px 14px 48px;
  border: 1px solid var(--l-border);
  border-radius: 12px;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  background: white;
  transition: all 0.15s;
  color: var(--l-ink);
}
.filter-search input:focus {
  outline: none;
  border-color: var(--l-accent);
  box-shadow: 0 0 0 3px var(--l-accent-soft);
}
.filter-search::before {
  content: '';
  position: absolute;
  left: 18px; top: 50%;
  transform: translateY(-50%);
  width: 18px; height: 18px;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='7'/><line x1='21' y1='21' x2='16.65' y2='16.65'/></svg>") no-repeat center;
  pointer-events: none;
}

.filter-pills {
  display: flex; gap: 8px; flex-wrap: wrap;
  align-items: center;
}
.filter-pill-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--l-ink-soft);
  font-weight: 600;
  margin-right: 4px;
}
.filter-pill {
  padding: 8px 14px;
  background: white;
  border: 1px solid var(--l-border);
  border-radius: 999px;
  font-size: 13px; font-weight: 500;
  color: var(--l-ink);
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  font-family: 'Inter', sans-serif;
}
.filter-pill:hover {
  border-color: var(--l-accent); color: var(--l-accent);
  text-decoration: none;
}
.filter-pill.active {
  background: var(--l-ink); color: white; border-color: var(--l-ink);
}
.filter-pill.active:hover { background: var(--l-ink); color: white; }

.filter-results-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--l-ink-soft);
  font-weight: 600;
  margin-bottom: 20px;
}

/* ============ SKILL PATH CARDS ============ */
.sp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.sp-card {
  display: flex; flex-direction: column;
  background: white;
  border: 1px solid var(--l-border);
  border-radius: 16px;
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}
.sp-card:hover {
  text-decoration: none;
  border-color: transparent;
  box-shadow: var(--l-shadow-hover);
  transform: translateY(-2px);
}
.sp-card-icon {
  font-size: 42px; line-height: 1;
  margin-bottom: 20px;
  display: inline-flex; align-items: center; justify-content: center;
  width: 64px; height: 64px;
  background: var(--l-bg-soft);
  border-radius: 16px;
  transition: background 0.2s;
}
.sp-card:hover .sp-card-icon { background: var(--l-accent-soft); }

.sp-card-category {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--l-ink-soft);
  font-weight: 600; margin-bottom: 8px;
}
.sp-card-name {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--l-ink);
  margin-bottom: 10px;
}
.sp-card-desc {
  font-family: 'Source Serif 4', serif;
  color: var(--l-ink-dim);
  font-size: 15px;
  line-height: 1.5;
  flex-grow: 1;
}
.sp-card-meta {
  display: flex; align-items: center; gap: 12px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--l-border-soft);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--l-ink-dim);
  font-weight: 600;
}
.sp-card-arrow {
  margin-left: auto;
  color: var(--l-accent);
  transition: transform 0.2s;
}
.sp-card:hover .sp-card-arrow { transform: translateX(4px); }

/* ============ LESSON CARDS ============ */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.lesson-card {
  display: flex; flex-direction: column;
  background: white;
  border: 1px solid var(--l-border);
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
  overflow: hidden;
  position: relative;
}
.lesson-card:hover {
  text-decoration: none;
  border-color: transparent;
  box-shadow: var(--l-shadow-hover);
  transform: translateY(-2px);
}
.lesson-card-cover {
  height: 140px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--l-accent-soft) 0%, var(--l-bg-soft) 100%);
  display: flex; align-items: center; justify-content: center;
}
.lesson-card-cover::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(3, 101, 242, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(232, 185, 72, 0.1) 0%, transparent 50%);
}
.lesson-card-cover-icon {
  font-size: 48px; line-height: 1;
  position: relative; z-index: 1;
}
.lesson-card-body {
  padding: 18px 20px 22px;
  display: flex; flex-direction: column;
  flex-grow: 1;
}
.lesson-card-meta {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 10px;
}
.lesson-card-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.lesson-card-tag.cat {
  background: var(--l-bg-soft);
  color: var(--l-ink-dim);
}
.lesson-card-tag.path {
  background: var(--l-accent-soft);
  color: var(--l-accent);
}
.lesson-card-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 19px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--l-ink);
  margin-bottom: 12px;
}
.lesson-card-footer {
  margin-top: auto;
  display: flex; align-items: center; justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--l-ink-dim);
  font-weight: 600;
}

/* ============ EMPTY STATE ============ */
.empty-state {
  text-align: center;
  padding: 80px 24px;
  background: white;
  border: 1px solid var(--l-border);
  border-radius: 16px;
}
.empty-state-icon {
  font-size: 48px;
  opacity: 0.3;
  margin-bottom: 14px;
}
.empty-state h3 {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 22px;
  margin-bottom: 8px;
  color: var(--l-ink);
}
.empty-state p {
  color: var(--l-ink-dim);
  font-size: 15px;
  max-width: 400px;
  margin: 0 auto;
  font-family: 'Source Serif 4', serif;
}

/* ============ SKILL PATH DETAIL PAGE ============ */
.sp-detail-hero {
  background: white;
  border: 1px solid var(--l-border);
  border-radius: 20px;
  padding: 48px;
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: start;
}
.sp-detail-icon {
  font-size: 64px;
  line-height: 1;
  display: inline-flex; align-items: center; justify-content: center;
  width: 96px; height: 96px;
  background: var(--l-accent-soft);
  border-radius: 20px;
  flex-shrink: 0;
}
.sp-detail-category {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--l-accent);
  font-weight: 600; margin-bottom: 12px;
}
.sp-detail-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: clamp(32px, 4.5vw, 48px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--l-ink);
  margin-bottom: 16px;
}
.sp-detail-short {
  font-family: 'Source Serif 4', serif;
  color: var(--l-ink);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.5;
  margin-bottom: 20px;
  font-weight: 500;
}
.sp-detail-full {
  color: var(--l-ink-dim);
  font-family: 'Source Serif 4', serif;
  font-size: 16px;
  line-height: 1.65;
  max-width: 720px;
}

.sp-lessons-header {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 20px;
}
.sp-lessons-header h2 {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -0.01em;
  color: var(--l-ink);
}
.sp-lessons-header .count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--l-ink-soft);
  font-weight: 600;
}

/* List view for lessons inside a skill path */
.sp-lesson-list {
  background: white;
  border: 1px solid var(--l-border);
  border-radius: 16px;
  overflow: hidden;
}
.sp-lesson-row {
  display: grid;
  grid-template-columns: 48px 1fr auto auto;
  gap: 20px;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--l-border-soft);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}
.sp-lesson-row:last-child { border-bottom: none; }
.sp-lesson-row:hover { background: var(--l-bg-soft); text-decoration: none; }
.sp-lesson-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px; font-weight: 600;
  color: var(--l-ink-soft);
}
.sp-lesson-body {
  min-width: 0;
}
.sp-lesson-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 17px;
  line-height: 1.3;
  color: var(--l-ink);
  margin-bottom: 4px;
}
.sp-lesson-category {
  font-size: 13px;
  color: var(--l-ink-dim);
}
.sp-lesson-duration {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--l-ink-dim);
  font-weight: 600;
  letter-spacing: 0.05em;
}
.sp-lesson-arrow {
  color: var(--l-accent);
  font-size: 18px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .catalog-wrap { padding: 32px 16px 64px; }
  .sp-detail-hero {
    grid-template-columns: 1fr;
    padding: 28px;
    gap: 20px;
  }
  .sp-detail-icon { width: 72px; height: 72px; font-size: 48px; }
  .sp-grid, .lesson-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-nav-inner { padding: 14px 16px; }
  .site-nav-links { gap: 2px; }
  .site-nav-links a { padding: 6px 10px; font-size: 13px; }
  .sp-card { padding: 20px; }
  .sp-lesson-row {
    grid-template-columns: 32px 1fr auto;
    gap: 12px;
    padding: 14px 16px;
  }
  .sp-lesson-arrow { display: none; }
  .sp-lesson-duration { font-size: 11px; }
}