:root {
  --ink: #1C2521;
  --ink-soft: #3A4541;
  --card: #F7F4EC;
  --card-line: #E3DCC8;
  --stamp: #A8332B;
  --lamp: #3D5A4C;
  --binding: #8A7B5C;
  --catalog-blue: #4FA8B0;   /* refined again: lighter, softer aqua (was #2B93A3) */
  --aqua-wash: #DCF1F2;      /* new: very light aqua for backgrounds/washes */
  --gold: #D9B26E;           /* refined: softer, less saturated gold (was #D9A94E) */
  --gold-deep: #BC935A;      /* refined: softer deep gold for hover/contrast states */
  --gold-wash: #F7EDD8;      /* new: very light gold for backgrounds/washes */
  --signal: #5B7A8C;
  --paper-shadow: rgba(28, 37, 33, 0.12);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--card);
  color: var(--ink);
  font-family: 'Inter', sans-serif;
  line-height: 1.5;
}

.mono { font-family: 'IBM Plex Mono', monospace; }
.serif { font-family: 'Source Serif 4', serif; }

a { color: inherit; text-decoration: none; }

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 31px, rgba(28,37,33,0.018) 32px);
  pointer-events: none;
  z-index: 0;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 32px; position: relative; z-index: 1; }

/* ===== NAV ===== */
nav {
  border-bottom: 1px solid var(--card-line);
  background: var(--card);
  position: sticky; top: 0; z-index: 50;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: 'Source Serif 4', serif;
  font-weight: 700; font-size: 1.3rem;
  letter-spacing: -0.01em;
}
.brand .mark {
  width: 34px; height: 34px;
  object-fit: contain;
  display: block;
}
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 0.92rem; font-weight: 500; color: var(--ink-soft);
  padding-bottom: 2px; border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.nav-links a:hover, .nav-links a:focus-visible { color: var(--ink); border-color: var(--catalog-blue); }
.nav-links a.current { color: var(--ink); border-color: var(--ink); }
.nav-cta {
  background: var(--catalog-blue); color: var(--card) !important;
  padding: 9px 18px; border-radius: 3px; font-weight: 600 !important;
  border: none !important;
}
.nav-cta:hover { background: #3D8F96; }

.nav-toggle { display: none; }

/* ===== PAGE HEADER (non-home pages) ===== */
.page-header { padding: 56px 0 40px; border-bottom: 1px solid var(--card-line); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem;
  color: var(--lamp); margin-bottom: 16px; letter-spacing: 0.02em;
}
.eyebrow .chip { background: var(--lamp); color: var(--card); padding: 2px 7px; border-radius: 2px; font-size: 0.72rem; }
.eyebrow .chip.red { background: var(--stamp); }
.eyebrow .chip.blue { background: var(--catalog-blue); }
h1.page-title { font-family: 'Source Serif 4', serif; font-size: 2.6rem; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 14px; }
.page-sub { font-size: 1.05rem; color: var(--ink-soft); max-width: 600px; }

/* ===== HERO (home) ===== */
.hero { padding: 88px 0 72px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: center; }

h1.serif {
  font-family: 'Source Serif 4', serif;
  font-size: 3.4rem; line-height: 1.05; font-weight: 600;
  letter-spacing: -0.015em; margin-bottom: 22px;
}
h1.serif em { font-style: italic; color: var(--catalog-blue); }

.hero-sub { font-size: 1.12rem; color: var(--ink-soft); max-width: 480px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn-primary, .btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 24px; border-radius: 3px; font-weight: 600; font-size: 0.95rem;
  cursor: pointer; transition: transform 0.12s, box-shadow 0.12s; border: none;
}
.btn-primary { background: var(--ink); color: var(--card); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 14px var(--paper-shadow); }
.btn-secondary { background: transparent; color: var(--ink); border: 1.5px solid var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--card); }

.drawer {
  background: linear-gradient(180deg, #fffdf8 0%, var(--card) 100%);
  border: 1px solid var(--card-line);
  border-radius: 6px;
  box-shadow: 0 18px 40px var(--paper-shadow);
  padding: 28px;
  position: relative;
}
.drawer::before {
  content: "";
  position: absolute; top: -11px; left: 24px;
  background: var(--catalog-blue); color: var(--card);
  font-family: 'IBM Plex Mono', monospace; font-size: 0.65rem; font-weight: 500;
  padding: 3px 10px; border-radius: 2px; letter-spacing: 0.05em;
  display: none;
}
.drawer-row { display: flex; align-items: center; gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--card-line); }
.drawer-row:last-child { border-bottom: none; }
.call-no { font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem; color: var(--catalog-blue); font-weight: 500; min-width: 64px; }
.drawer-row .title { font-size: 0.92rem; font-weight: 500; flex: 1; }
.drawer-row .tag { font-family: 'IBM Plex Mono', monospace; font-size: 0.65rem; color: var(--lamp); border: 1px solid var(--lamp); padding: 2px 6px; border-radius: 10px; }
.tag.free { color: var(--stamp); border-color: var(--stamp); }
.tag.ai { color: var(--catalog-blue); border-color: var(--catalog-blue); }

/* ===== LANTERN ICONS ===== */
/* Replaces the Dewey-style call-number codes (021.2, 025.04 etc.) as the
   per-course visual marker. Each category gets a lantern tinted with its
   accent color; the free flagship course gets the fully "lit" gold glow —
   a direct expression of the unlit/glowing/lit Lantern System metaphor
   rather than a second invented labeling scheme. */
.lantern-icon-wrap {
  display: flex; align-items: center; justify-content: center;
  min-width: 58px; flex-shrink: 0;
}
.lantern-icon-wrap svg { width: 26px; height: 32px; }
.lantern-icon-wrap .lantern-label {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.6rem;
  text-transform: uppercase; letter-spacing: 0.04em; color: inherit; opacity: 0.85;
}
.lantern-glow { transition: fill-opacity 0.2s; }

.lantern-icon-wrap.ai          { color: var(--gold); }
.lantern-icon-wrap.systems     { color: var(--catalog-blue); }
.lantern-icon-wrap.advocacy    { color: var(--lamp); }
.lantern-icon-wrap.instruction { color: var(--signal); }
.lantern-icon-wrap.management  { color: var(--stamp); }
.lantern-icon-wrap.career      { color: var(--binding); }
.lantern-icon-wrap.bundle      { color: var(--ink); }
.lantern-icon-wrap.free        { color: var(--gold); }

/* Real logo image used as the category icon instead of the plain line-art SVG.
   A soft colored ring behind the logo preserves per-category color coding. */
.lantern-icon-wrap img.cat-icon-img {
  width: 48px; height: 48px; object-fit: cover; border-radius: 50%;
  box-shadow: 0 0 0 2px currentColor, 0 2px 8px rgba(28,37,33,0.15);
}
.lantern-icon-wrap.free img.cat-icon-img {
  box-shadow: 0 0 0 2.5px var(--gold), 0 2px 10px rgba(217,178,110,0.4);
  filter: drop-shadow(0 0 4px rgba(217,178,110,0.5));
}

.spine .lantern-icon-wrap, .drawer-row .lantern-icon-wrap { min-width: 58px; }

/* ===== SECTION SHARED ===== */
section { padding: 64px 0; }
.section-head { margin-bottom: 40px; max-width: 640px; }
.section-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem; color: var(--binding); margin-bottom: 12px; letter-spacing: 0.04em; text-transform: uppercase; }
h2.serif { font-family: 'Source Serif 4', serif; font-size: 2.1rem; font-weight: 600; letter-spacing: -0.01em; }
h3.serif { font-family: 'Source Serif 4', serif; font-weight: 600; }

/* ===== SHELF (course catalog) ===== */
.shelf-divider {
  height: 14px;
  background: linear-gradient(180deg, var(--binding) 0%, #6F624A 100%);
  border-radius: 0 0 3px 3px;
  box-shadow: 0 6px 10px var(--paper-shadow);
  margin: 0 0 36px;
}
.shelf-filters { display: flex; gap: 10px; margin-bottom: 28px; flex-wrap: wrap; }
.filter-chip {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.74rem;
  border: 1px solid var(--card-line); background: #FFFEFA;
  padding: 7px 14px; border-radius: 20px; cursor: pointer;
  color: var(--ink-soft); transition: all 0.15s;
}
.filter-chip:hover, .filter-chip.active { border-color: var(--ink); color: var(--ink); background: var(--card); }

.spine-row { display: flex; flex-direction: column; gap: 0; border-top: 2px solid var(--ink); }
.spine {
  display: grid; grid-template-columns: 68px 1fr 140px 110px 100px;
  align-items: center; gap: 20px;
  padding: 18px 16px;
  border-bottom: 1px solid var(--card-line);
  transition: background 0.15s;
}
.spine:hover { background: rgba(58,69,65,0.04); }
.spine .call-no { color: var(--catalog-blue); font-weight: 500; }
.spine .course-title { font-weight: 600; font-size: 0.98rem; }
.spine .course-desc { font-size: 0.82rem; color: var(--ink-soft); margin-top: 2px; }
.spine .level { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; color: var(--lamp); }
.spine .price { font-weight: 600; font-size: 0.92rem; text-align: right; }
.spine .price.free { color: var(--stamp); }
.spine .price.tiered { color: var(--catalog-blue); font-size: 0.82rem; }
.spine .cta-mini { text-align: right; font-size: 0.82rem; font-weight: 600; color: var(--ink); border-bottom: 1px solid var(--ink); justify-self: end; }

.shelf-head {
  display: grid; grid-template-columns: 68px 1fr 140px 110px 100px;
  gap: 20px; padding: 0 16px 10px;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem;
  color: var(--binding); text-transform: uppercase; letter-spacing: 0.05em;
}
.shelf-head .price, .shelf-head .cta-mini { text-align: right; }

/* ===== STAMP CARDS ===== */
.stamp-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.stamp-card { border: 1px solid var(--card-line); border-radius: 4px; padding: 28px 24px; background: #FFFEFA; position: relative; }
.stamp-card .num {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem;
  color: var(--stamp); border: 1.5px solid var(--stamp);
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px; transform: rotate(-6deg);
}
.stamp-card h3 { font-size: 1.08rem; font-weight: 600; margin-bottom: 8px; }
.stamp-card p { font-size: 0.88rem; color: var(--ink-soft); }

/* ===== SPLIT PANELS ===== */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.panel { border-radius: 6px; padding: 36px; display: flex; flex-direction: column; gap: 14px; }
.panel.dark { background: var(--ink); color: var(--card); }
.panel.light { background: #FFFEFA; border: 1px solid var(--card-line); }
.panel .panel-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.04em; text-transform: uppercase; opacity: 0.7; }
.panel h3.serif { font-size: 1.6rem; font-weight: 600; }
.panel p { font-size: 0.92rem; opacity: 0.85; max-width: 380px; }
.panel-list { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.panel-list .row { display: flex; justify-content: space-between; font-size: 0.86rem; border-bottom: 1px dashed rgba(255,255,255,0.2); padding-bottom: 7px; }
.panel.light .panel-list .row { border-bottom: 1px dashed var(--card-line); }
.panel-cta { margin-top: 12px; }
.panel.dark .btn-primary { background: var(--card); color: var(--ink); }
.panel.light .btn-primary { background: var(--ink); color: var(--card); }

/* ===== BLOG ===== */
.blog-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.post-card { border-top: 3px solid var(--lamp); padding-top: 16px; }
.post-card .date { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; color: var(--binding); margin-bottom: 8px; }
.post-card h4 { font-size: 1.02rem; font-weight: 600; margin-bottom: 8px; line-height: 1.3; }
.post-card p { font-size: 0.86rem; color: var(--ink-soft); }
.post-card .read-more { display: inline-block; margin-top: 10px; font-size: 0.82rem; font-weight: 600; border-bottom: 1px solid var(--ink); }
.post-card.category-tip { border-top-color: var(--lamp); }
.post-card.category-trend { border-top-color: var(--catalog-blue); }
.post-card.category-qa { border-top-color: var(--stamp); }
.post-card.category-bts { border-top-color: var(--binding); }
.post-card.category-ai { border-top-color: var(--catalog-blue); }
.post-list { display: flex; flex-direction: column; gap: 0; border-top: 2px solid var(--ink); }
.post-row { display: grid; grid-template-columns: 110px 1fr; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--card-line); }
.post-row .date { font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem; color: var(--binding); }
.post-row h4 { font-size: 1.1rem; margin-bottom: 6px; }
.post-row p { font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 8px; }
.post-row .tag-row { display: flex; gap: 8px; }
.post-row .tag-row span { font-family: 'IBM Plex Mono', monospace; font-size: 0.65rem; color: var(--lamp); border: 1px solid var(--lamp); padding: 1px 6px; border-radius: 10px; }

.post-article { max-width: 680px; margin: 0 auto; padding: 56px 0 80px; }
.post-article .date { font-family: 'IBM Plex Mono', monospace; font-size: 0.8rem; color: var(--binding); margin-bottom: 12px; }
.post-article h1 { font-family: 'Source Serif 4', serif; font-size: 2.3rem; font-weight: 600; margin-bottom: 24px; line-height: 1.15; }
.post-article h2 { font-family: 'Source Serif 4', serif; font-size: 1.4rem; font-weight: 600; margin: 32px 0 14px; }
.post-article p { font-size: 1.02rem; color: var(--ink-soft); margin-bottom: 18px; line-height: 1.7; }
.post-article strong { color: var(--ink); }
.post-article ol, .post-article ul { margin: 0 0 18px 0; padding-left: 22px; color: var(--ink-soft); }
.post-article li { margin-bottom: 8px; line-height: 1.6; }
.post-cta { background: #FFFEFA; border: 1px solid var(--card-line); border-left: 3px solid var(--stamp); padding: 20px 24px; margin-top: 36px; border-radius: 4px; }
.post-cta p { margin-bottom: 10px; font-size: 0.95rem; }
.post-cta a { font-weight: 600; border-bottom: 1px solid var(--ink); }

/* ===== FORMS ===== */
.form-card { background: #FFFEFA; border: 1px solid var(--card-line); border-radius: 6px; padding: 36px; }
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 11px 14px; border: 1px solid var(--card-line);
  border-radius: 3px; font-family: 'Inter', sans-serif; font-size: 0.92rem;
  background: var(--card); color: var(--ink);
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus { outline: 2px solid var(--catalog-blue); outline-offset: 1px; border-color: var(--catalog-blue); }
.form-note { font-size: 0.8rem; color: var(--binding); margin-top: 6px; }
.embed-frame {
  border: 1px dashed var(--card-line); border-radius: 6px; padding: 40px;
  text-align: center; color: var(--binding); font-size: 0.88rem; background: #FFFEFA;
}

/* ===== PRICING TABLE ===== */
.price-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.price-table th, .price-table td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--card-line); font-size: 0.9rem; }
.price-table th { font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--binding); }
.price-table td.price { font-weight: 600; }

/* ===== FOOTER ===== */
footer { border-top: 1px solid var(--card-line); padding: 48px 0 40px; }
.footer-grid { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 32px; }
.footer-brand { font-family: 'Source Serif 4', serif; font-weight: 700; font-size: 1.15rem; }
.footer-links { display: flex; gap: 40px; }
.footer-col h5 { font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem; text-transform: uppercase; color: var(--binding); margin-bottom: 12px; letter-spacing: 0.04em; }
.footer-col a { display: block; font-size: 0.88rem; margin-bottom: 8px; color: var(--ink-soft); }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--card-line); font-size: 0.78rem; color: var(--binding); }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  h1.serif { font-size: 2.4rem; }
  h1.page-title { font-size: 2rem; }
  .stamp-grid { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .blog-strip { grid-template-columns: 1fr; }
  .spine, .shelf-head { grid-template-columns: 70px 1fr; }
  .spine .level, .spine .price, .spine .cta-mini,
  .shelf-head .level, .shelf-head .price, .shelf-head .cta-mini { display: none; }
  .footer-links { gap: 24px; }
  .nav-links { display: none; }
  .post-row { grid-template-columns: 1fr; gap: 8px; }
}

:focus-visible { outline: 2px solid var(--catalog-blue); outline-offset: 2px; }