/* =====================================================================
   terasu-studio v1 — Lab/Atlas aesthetic (warm cream + Fraunces serif)
   ===================================================================== */

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

:root {
  /* Color (Lab/Atlas) */
  --bg: #f5f3ee;
  --paper: #ffffff;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --ink-mute: #8a8a8a;
  --line: #e2dfd6;
  --line-soft: #ebe8df;
  --primary: #1a1a1a;
  --secondary: #8a8a8a;
  --tertiary: #c8c5bd;
  --accent: #6b6b6b;
  --star: #c89b2a;
  --star-empty: #c8c5bd;

  /* Type */
  --font-serif: 'Fraunces', 'Shippori Mincho', Georgia, serif;
  --font-sans: 'Inter', 'Noto Sans JP', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Layout */
  --max: 1320px;
  --pad: 32px;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
::selection { background: var(--ink); color: var(--bg); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }

/* =====================================================================
   HEADER (top sticky nav)
   ===================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(245, 243, 238, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}
.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.brand strong {
  color: var(--ink);
  font-weight: 500;
  font-size: 11px;
}
.brand .sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
}
.header-nav {
  display: flex;
  gap: 18px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.header-nav a {
  color: var(--ink-mute);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
  white-space: nowrap;
}
.header-nav a:hover { color: var(--ink); }
.header-nav a.active { color: var(--ink); border-bottom-color: var(--ink); }

.fav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px !important;
  border: 1px solid var(--ink) !important;
  border-bottom: 1px solid var(--ink) !important;
  border-radius: 0 !important;
  background: var(--bg);
  color: var(--ink) !important;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  transition: background .15s;
}
.fav-btn:hover { background: var(--ink) !important; color: #fff !important; }
.fav-btn .count {
  display: inline-block;
  min-width: 18px;
  height: 18px;
  background: var(--ink);
  color: #fff;
  border-radius: 999px;
  text-align: center;
  font-size: 9px;
  line-height: 18px;
  padding: 0 6px;
  font-weight: 500;
}
.fav-btn:hover .count { background: var(--bg); color: var(--ink); }
.fav-btn .count.zero { opacity: 0.5; }

@media (max-width: 720px) {
  .header-nav a:not(.fav-btn) { display: none; }
  .brand .sub { display: none; }
}

/* =====================================================================
   HERO (index page)
   ===================================================================== */
.hero {
  padding: 100px var(--pad) 64px;
  border-bottom: 1px solid var(--line);
  max-width: var(--max);
  margin: 0 auto;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(48px, 7vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  max-width: 1000px;
  color: var(--ink);
}
.hero h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--ink-soft);
}
.hero .lead {
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 720px;
}
.hero-stats {
  margin-top: 56px;
  display: flex;
  gap: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.hero-stat {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.hero-stat strong {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* =====================================================================
   SECTION LABEL
   ===================================================================== */
.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

/* =====================================================================
   CATEGORY GRID (index)
   ===================================================================== */
.cat-section { padding: 80px 0 120px; }
.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (max-width: 960px) { .cat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .cat-grid { grid-template-columns: 1fr; } }

.cat-card {
  background: var(--paper);
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 280px;
  transition: background 0.2s;
  position: relative;
}
.cat-card:hover { background: var(--bg); }
.cat-card.disabled { opacity: 0.45; pointer-events: none; }
.cat-card.disabled::after {
  content: 'COMING SOON';
  position: absolute;
  top: 24px; right: 24px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  background: var(--bg);
  padding: 4px 8px;
}
.cat-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.cat-desc {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}
.cat-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 36px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-top: auto;
}
.cat-title em {
  font-style: italic;
  font-weight: 300;
  color: var(--ink-soft);
}
.cat-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.cat-meta .arrow { transition: transform 0.2s; color: var(--ink); }
.cat-card:hover .arrow { transform: translateX(4px); }

/* =====================================================================
   PAGE HEAD (subpages)
   ===================================================================== */
.page-head {
  padding: 100px 0 56px;
  border-bottom: 1px solid var(--line);
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--ink-mute); transition: color .15s; }
.breadcrumb a:hover { color: var(--ink); }
.page-head h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(40px, 5.6vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 18px;
}
.page-head h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--ink-soft);
}
.page-head .intro {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 640px;
}

/* =====================================================================
   TOOLBAR
   ===================================================================== */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 22px;
  flex-wrap: wrap;
}
.toolbar-info {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.toolbar-info strong {
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: -0.01em;
  font-weight: 400;
  margin-right: 8px;
}
.chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.chip {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  padding: 6px 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all .15s;
  text-transform: uppercase;
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* =====================================================================
   PALETTE CARDS
   ===================================================================== */
.palette-grid {
  padding: 16px 0 80px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.palette-card {
  background: var(--paper);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: background .15s;
}
.palette-card.hidden { display: none; }
.palette-card:hover { background: var(--bg); }
.palette-swatches {
  display: flex;
  height: 140px;
}
.palette-swatch {
  flex: 1;
  position: relative;
  cursor: pointer;
  transition: flex .25s;
}
.palette-swatch:hover { flex: 1.6; }
.palette-swatch::after {
  content: attr(data-hex);
  position: absolute;
  bottom: 8px; left: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity .15s;
  padding: 3px 6px;
  background: rgba(245, 243, 238, 0.92);
  color: var(--ink);
}
.palette-swatch:hover::after { opacity: 1; }
.palette-meta {
  padding: 20px 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.palette-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.palette-tags {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}
.palette-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--ink-mute);
  background: var(--bg);
  padding: 3px 7px;
  letter-spacing: 0.06em;
}
.palette-note {
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.7;
  border-top: 1px solid var(--line-soft);
  padding-top: 10px;
  margin-top: 4px;
}
.palette-actions {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}
.btn-small {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 8px 10px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all .15s;
}
.btn-small:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-small.copied { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* =====================================================================
   FONT CARDS
   ===================================================================== */
.font-grid {
  padding: 16px 0 80px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.font-card {
  background: var(--paper);
  padding: 28px 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: background .15s;
}
.font-card:hover { background: var(--bg); }
.font-card.hidden { display: none; }
.font-sample {
  font-size: 30px;
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: 0.01em;
  min-height: 70px;
  display: flex;
  align-items: center;
}
.font-sample-jp {
  font-size: 22px;
  color: var(--ink);
  line-height: 1.4;
  margin-top: -4px;
}
.font-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
}
.font-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.font-type {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-mute);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.font-note {
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.7;
}
.font-tags { display: flex; gap: 5px; flex-wrap: wrap; }
.font-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--ink-mute);
  background: var(--bg);
  padding: 3px 7px;
  letter-spacing: 0.06em;
}
.font-actions { display: flex; gap: 6px; margin-top: 4px; align-items: center; }

/* =====================================================================
   STAR
   ===================================================================== */
.star {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--star-empty);
  transition: color .15s, transform .15s;
}
.star:hover { color: var(--star); transform: scale(1.12); }
.star.active { color: var(--star); }
.star svg { width: 16px; height: 16px; }

/* =====================================================================
   FAVORITES PAGE
   ===================================================================== */
.fav-page { padding: 0 0 80px; }
.fav-empty {
  text-align: center;
  padding: 100px 24px;
  color: var(--ink-soft);
}
.fav-empty h2 {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.fav-empty h2 em { font-style: italic; font-weight: 300; color: var(--ink-soft); }
.fav-empty p {
  font-size: 14px;
  margin-bottom: 28px;
}
.fav-empty .btn {
  display: inline-block;
  padding: 14px 28px;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.fav-actions-bar {
  display: flex;
  gap: 12px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
}
.btn-primary {
  padding: 14px 24px;
  background: var(--ink);
  color: var(--bg);
  border: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: opacity .15s;
}
.btn-primary:hover { opacity: 0.85; }
.btn-primary.copied { background: var(--ink-soft); }
.btn-ghost {
  padding: 14px 20px;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: border-color .15s;
}
.btn-ghost:hover { border-color: var(--ink); }

.fav-section { padding: 48px 0 0; }
.fav-section h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 18px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.fav-section h3 em { font-style: italic; font-weight: 300; color: var(--ink-soft); }
.fav-section h3 .cnt {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.prompt-preview {
  margin-top: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--ink);
  white-space: pre-wrap;
  max-height: 400px;
  overflow-y: auto;
}

/* =====================================================================
   FOOTER
   ===================================================================== */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 48px var(--pad);
  margin-top: 40px;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
@media (max-width: 560px) {
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}

/* =====================================================================
   TOAST
   ===================================================================== */
.toast {
  position: fixed;
  bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: var(--ink);
  color: var(--bg);
  padding: 12px 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  z-index: 1000;
  transition: transform .25s cubic-bezier(.16,1,.3,1);
  pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); }