/* Life Book — warm journal design system */

:root {
  --paper: oklch(0.945 0.018 80);
  --paper-2: oklch(0.92 0.022 78);
  --paper-edge: oklch(0.88 0.025 75);
  --ink: oklch(0.24 0.02 60);
  --ink-2: oklch(0.38 0.02 60);
  --ink-3: oklch(0.55 0.02 60);
  --rule: oklch(0.78 0.02 70);
  --rule-2: oklch(0.84 0.02 70);

  --gold: oklch(0.68 0.10 78);
  --gold-deep: oklch(0.56 0.11 70);
  --gold-soft: oklch(0.82 0.06 80);

  --lotus: oklch(0.78 0.09 15);
  --lotus-deep: oklch(0.62 0.12 18);
  --leaf: oklch(0.55 0.07 145);
  --leaf-soft: oklch(0.78 0.05 145);
  --water: oklch(0.50 0.04 220);
  --water-soft: oklch(0.78 0.03 220);

  --shadow-soft: 0 1px 2px oklch(0.30 0.02 60 / 0.08), 0 8px 28px oklch(0.30 0.02 60 / 0.12);
  --shadow-page: 0 30px 60px -20px oklch(0.20 0.02 60 / 0.35), 0 18px 30px -15px oklch(0.20 0.02 60 / 0.20);

  --font-han: "Noto Serif TC", "Songti TC", "Source Han Serif TC", serif;
  --font-han-sans: "Noto Sans TC", system-ui, sans-serif;
  --font-en: "Cormorant Garamond", "EB Garamond", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-han);
  color: var(--ink);
  background: #1a1410;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Paper texture: subtle warm grain via layered gradients */
.paper {
  background-color: var(--paper);
  background-image:
    radial-gradient(1200px 800px at 10% 0%, oklch(0.97 0.02 80) 0%, transparent 60%),
    radial-gradient(900px 700px at 100% 100%, oklch(0.90 0.03 75) 0%, transparent 55%),
    repeating-linear-gradient(0deg, oklch(0.92 0.02 78 / 0.0) 0px, oklch(0.92 0.02 78 / 0.0) 2px, oklch(0.86 0.03 75 / 0.05) 3px, oklch(0.92 0.02 78 / 0.0) 4px),
    radial-gradient(2px 2px at 20% 30%, oklch(0.80 0.04 70 / 0.15), transparent 60%),
    radial-gradient(2px 2px at 70% 60%, oklch(0.80 0.04 70 / 0.12), transparent 60%),
    radial-gradient(2px 2px at 40% 80%, oklch(0.80 0.04 70 / 0.10), transparent 60%);
}

.paper-deckled {
  position: relative;
}
.paper-deckled::after {
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 80px oklch(0.50 0.04 60 / 0.08);
  border-radius: inherit;
}

/* Ink rules */
.rule {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rule) 12%, var(--rule) 88%, transparent);
  border: 0;
}
.rule-thick {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--ink-2) 10%, var(--ink-2) 90%, transparent);
}
.rule-double {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  height: 4px;
}

/* Type */
.han-display { font-family: var(--font-han); font-weight: 600; letter-spacing: 0.05em; }
.han-body { font-family: var(--font-han); font-weight: 400; line-height: 1.85; letter-spacing: 0.03em; }
.en-title { font-family: var(--font-en); font-style: italic; font-weight: 500; letter-spacing: 0.02em; }
.en-caps { font-family: var(--font-en); text-transform: uppercase; letter-spacing: 0.32em; font-weight: 500; }
.mono { font-family: var(--font-mono); font-feature-settings: "tnum" 1; }

/* Chapter mark — small gold seal */
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  background: var(--gold);
  color: var(--paper);
  font-family: var(--font-han);
  font-weight: 700;
  font-size: 18px;
  border-radius: 4px;
  box-shadow: 0 1px 0 oklch(0.50 0.10 70 / 0.5), inset 0 0 0 1px oklch(0.50 0.10 70 / 0.3);
}
.seal-sm { width: 24px; height: 24px; font-size: 13px; border-radius: 3px; }

/* Vellum tab (left rail nav item) */
.tab {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px 10px 18px;
  cursor: pointer;
  color: var(--ink-2);
  border-left: 3px solid transparent;
  font-family: var(--font-han);
  font-size: 15px;
  letter-spacing: 0.08em;
  transition: all 160ms ease;
  user-select: none;
}
.tab:hover { color: var(--ink); background: oklch(0.90 0.025 78 / 0.6); }
.tab.active {
  color: var(--ink);
  border-left-color: var(--gold);
  background: linear-gradient(90deg, oklch(0.88 0.04 78 / 0.5), transparent);
}
.tab .num {
  font-family: var(--font-en);
  font-style: italic;
  color: var(--ink-3);
  font-size: 13px;
  width: 22px;
}
.tab.active .num { color: var(--gold-deep); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-han);
  font-size: 14px;
  letter-spacing: 0.12em;
  border: 0; border-radius: 2px;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 14px oklch(0.20 0.02 60 / 0.25); }
.btn-gold { background: var(--gold); color: oklch(0.20 0.04 60); }
.btn-gold:hover { background: var(--gold-deep); color: var(--paper); }
.btn-ghost { background: transparent; color: var(--ink-2); border: 1px solid var(--rule); }
.btn-ghost:hover { background: oklch(0.90 0.025 78 / 0.5); color: var(--ink); }

/* Card */
.card {
  background: var(--paper);
  border: 1px solid var(--rule-2);
  border-radius: 3px;
  box-shadow: var(--shadow-soft);
}

/* Photo placeholder — striped */
.photo-ph {
  position: relative;
  background:
    repeating-linear-gradient(135deg,
      oklch(0.85 0.03 75) 0 8px,
      oklch(0.88 0.025 75) 8px 16px);
  border: 1px solid var(--rule);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Scrollbar styling within paper context */
.paper-scroll::-webkit-scrollbar { width: 8px; }
.paper-scroll::-webkit-scrollbar-track { background: transparent; }
.paper-scroll::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 4px; }
.paper-scroll::-webkit-scrollbar-thumb:hover { background: var(--ink-3); }

/* Stamp / chop style */
.chop {
  display: inline-block;
  padding: 4px 8px;
  background: var(--lotus-deep);
  color: var(--paper);
  font-family: var(--font-han);
  font-size: 11px;
  letter-spacing: 0.3em;
  transform: rotate(-3deg);
  box-shadow: inset 0 0 0 1px oklch(0.40 0.10 18 / 0.4);
  opacity: 0.9;
}

/* Tag */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px;
  background: oklch(0.88 0.04 78 / 0.5);
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-family: var(--font-han);
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.08em;
}

/* Number ribbon */
.bignum {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* Subtle hover lift */
.lift { transition: transform 200ms ease, box-shadow 200ms ease; }
.lift:hover { transform: translateY(-2px); box-shadow: 0 14px 30px oklch(0.20 0.02 60 / 0.18); }

/* Page enter */
@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.page-in { animation: pageIn 360ms ease both; }

/* Inputs */
.field {
  display: block;
  width: 100%;
  background: oklch(0.97 0.015 80);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 10px 12px;
  font-family: var(--font-han);
  color: var(--ink);
  font-size: 14px;
  outline: none;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}
.field:focus { border-color: var(--gold); box-shadow: 0 0 0 3px oklch(0.82 0.06 80 / 0.4); }

/* Hide spinner numbers */
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

/* ─── Book shell layout ─────────────────────────────────────────── */
.book-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: 100vh;
  height: 100dvh; /* iOS-friendly */
  background: #1a1410;
  position: relative;
}
.book-sidebar {
  position: relative;
  z-index: 5;
  height: 100vh;
  height: 100dvh;
  overflow: auto;
  border-right: 1px solid var(--paper-edge);
  box-shadow: 8px 0 24px oklch(0 0 0 / 0.25);
}
.book-main {
  position: relative;
  z-index: 1;
  height: 100vh;
  height: 100dvh;
  overflow: auto;
  box-shadow: inset 12px 0 28px oklch(0.30 0.02 60 / 0.06);
}
.book-mobile-bar { display: none; }
.book-overlay { display: none; }
.book-mobile-close { display: none; }

/* ─── MOBILE — sidebar becomes a drawer ─────────────────────────── */
@media (max-width: 760px) {
  .book-shell {
    grid-template-columns: 1fr;
  }
  .book-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, 320px);
    z-index: 60;
    transform: translateX(-105%);
    transition: transform .28s ease;
    box-shadow: 12px 0 32px rgba(0, 0, 0, .55);
  }
  .book-sidebar.open { transform: translateX(0); }
  .book-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(20, 16, 11, 0);
    z-index: 50;
    pointer-events: none;
    transition: background .28s ease;
  }
  .book-overlay.open {
    background: rgba(20, 16, 11, .55);
    pointer-events: auto;
    backdrop-filter: blur(2px);
  }
  .book-mobile-close {
    display: block !important;
    position: absolute;
    top: 14px;
    right: 14px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--rule);
    color: var(--ink-3);
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
  }
  .book-mobile-bar {
    display: flex !important;
    position: sticky;
    top: 0;
    z-index: 20;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: linear-gradient(180deg, var(--paper) 70%, oklch(0.94 0.025 80 / 0.85));
    border-bottom: 1px solid var(--rule-2);
  }
  .book-mobile-bar button.menu {
    width: 38px; height: 38px;
    border: 1px solid var(--rule);
    background: transparent;
    color: var(--ink);
    border-radius: 4px;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    padding: 0;
  }
  .book-mobile-bar .crumb {
    flex: 1;
    font-family: var(--font-han);
    font-size: 16px;
    letter-spacing: 0.18em;
    color: var(--ink);
    font-weight: 500;
  }
  .book-mobile-bar .lock {
    background: transparent;
    border: 1px solid var(--rule);
    color: var(--ink-3);
    border-radius: 4px;
    padding: 6px 10px;
    cursor: pointer;
    font-size: 13px;
    font-family: var(--font-han);
    letter-spacing: 0.1em;
  }

  .page-in {
    padding: 24px 18px 80px !important;
  }
  .page-in h1 {
    font-size: 28px !important;
    letter-spacing: 0.12em !important;
  }
  .page-in h2 {
    font-size: 16px !important;
  }

  /* Diary nested 2-column → stack */
  .diary-shell {
    grid-template-columns: 1fr !important;
    height: auto !important;
  }
  .diary-shell aside {
    border-right: 0 !important;
    border-bottom: 1px solid var(--rule);
    padding: 16px 0 !important;
    max-height: 320px;
    overflow: auto;
  }
  .diary-shell > div:last-child {
    padding: 28px 18px 60px !important;
  }

  /* Grids that should stack on mobile */
  .grid-stack-mobile {
    grid-template-columns: 1fr !important;
  }

  /* Modal — full-screen */
  .modal-mobile-full {
    max-width: 100% !important;
    max-height: 100vh !important;
    max-height: 100dvh !important;
    border-radius: 0 !important;
    padding: 24px 18px !important;
  }
  .editor-grid {
    grid-template-columns: 1fr !important;
  }

  .top-corner-label { display: none !important; }
}