/* ============================================================
   FNN Dev — Private Docs shared stylesheet
   Brand: primary #16213B · accent #4781E8 · white #FFFFFF · gray #94A3B8
   Dark mode is the default; [data-theme="light"] overrides.
   ============================================================ */

/* ---------- Theme tokens ---------- */
:root,
:root[data-theme="dark"] {
  --brand-primary: #16213B;
  --brand-accent:  #4781E8;
  --brand-gray:    #94A3B8;

  --bg:        #0D1322;
  --surface:   #16213B;
  --surface-2: #1B284A;
  --border:    #2A3656;
  --text:      #E6EBF4;
  --text-soft: #94A3B8;
  --heading:   #FFFFFF;
  --accent:    #5A90EE;
  --accent-strong: #4781E8;
  --accent-soft: rgba(71, 129, 232, 0.16);
  --code-bg:   #11192C;
  --code-text: #C7D6F5;
  --warn:      #E6B23E;
  --warn-soft: rgba(230, 178, 62, 0.12);
  --ok:        #5BC47E;
  --ok-soft:   rgba(91, 196, 126, 0.14);
  --shadow:    0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.25);
}

:root[data-theme="light"] {
  --bg:        #F4F6FB;
  --surface:   #FFFFFF;
  --surface-2: #F1F5F9;
  --border:    #E2E8F0;
  --text:      #1F2937;
  --text-soft: #475569;
  --heading:   #16213B;
  --accent:    #4781E8;
  --accent-strong: #2F66C9;
  --accent-soft: #EEF3FE;
  --code-bg:   #F1F5F9;
  --code-text: #16213B;
  --warn:      #B8860B;
  --warn-soft: #FCF6E4;
  --ok:        #2E7D43;
  --ok-soft:   #E3F0E5;
  --shadow:    0 8px 24px rgba(22, 33, 59, 0.08);
  --shadow-sm: 0 4px 14px rgba(22, 33, 59, 0.05);
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
               "Segoe UI", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  transition: background 0.25s ease, color 0.25s ease;
}

a { color: var(--accent); }

code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 5px;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.86em;
  color: var(--code-text);
}

strong { color: var(--heading); }

/* ---------- Theme toggle (fixed top-right) ---------- */
.theme-toggle {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 50;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 999px;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background 0.2s, border-color 0.2s, transform 0.1s;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle:active { transform: scale(0.96); }
.theme-toggle .icon { font-size: 1rem; line-height: 1; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: inline; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: inline; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ---------- Masthead ---------- */
header.masthead {
  background: linear-gradient(135deg, var(--brand-primary) 0%, #0F1830 100%);
  color: #FFFFFF;
  padding: 56px 24px 44px;
  border-bottom: 1px solid var(--border);
}
:root[data-theme="light"] header.masthead { background: var(--brand-primary); }
.masthead-inner { max-width: 920px; margin: 0 auto; }
.eyebrow {
  color: var(--brand-accent);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  margin: 0 0 10px;
}
header.masthead h1 {
  margin: 0 0 12px;
  font-size: 2.3rem;
  line-height: 1.2;
  font-weight: 800;
  color: #FFFFFF;
}
header.masthead p.lead {
  margin: 0;
  color: #C7D2E5;
  font-size: 1.05rem;
  max-width: 700px;
}
.meta-row { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 10px; }
.badge {
  display: inline-block;
  background: rgba(71, 129, 232, 0.18);
  border: 1px solid rgba(71, 129, 232, 0.5);
  color: #FFFFFF;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}
.lang-switch { margin-top: 22px; display: flex; gap: 10px; align-items: center; font-size: 0.85rem; }
.lang-switch a {
  color: #C7D2E5;
  text-decoration: none;
  padding: 4px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
}
.lang-switch a:hover { border-color: rgba(71,129,232,0.5); color: #FFFFFF; }
.lang-switch a.active { background: var(--brand-accent); color: #FFFFFF; font-weight: 700; }
.lang-switch .sep { color: #54648A; }

/* ---------- Layout ---------- */
main { max-width: 920px; margin: 0 auto; padding: 0 24px 90px; }

/* ---------- TOC ---------- */
nav.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 28px;
  margin: -28px 0 44px;
  box-shadow: var(--shadow);
}
nav.toc h2 {
  margin: 0 0 14px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
}
nav.toc ol {
  margin: 0; padding: 0; list-style: none;
  counter-reset: toc;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 24px;
}
nav.toc li { counter-increment: toc; }
nav.toc a {
  display: flex; align-items: baseline; gap: 12px;
  text-decoration: none; color: var(--heading); font-weight: 600;
  padding: 8px 10px; border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}
nav.toc a:hover { background: var(--surface-2); color: var(--accent); }
nav.toc a::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem; font-weight: 700;
}

/* ---------- Sections ---------- */
section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 36px 40px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 20px;
}
section > h2 {
  margin: 0 0 6px;
  font-size: 1.6rem;
  color: var(--heading);
  font-weight: 800;
  display: flex; align-items: center; gap: 14px;
}
section > h2 .num {
  font-size: 0.95rem;
  color: #FFFFFF;
  background: var(--accent-strong);
  width: 34px; height: 34px;
  border-radius: 9px;
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.section-sub { color: var(--text-soft); margin: 0 0 24px 48px; font-size: 0.92rem; }

h3 {
  color: var(--heading);
  font-size: 1.15rem;
  margin: 32px 0 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}
h4 { color: var(--text); font-size: 1rem; margin: 22px 0 8px; }

p { margin: 0 0 14px; color: var(--text-soft); }
ul, ol.body-list { margin: 0 0 16px; padding-left: 22px; color: var(--text-soft); }
li { margin-bottom: 7px; }

/* ---------- Callouts ---------- */
.callout {
  border-left: 4px solid var(--accent-strong);
  background: var(--accent-soft);
  padding: 14px 18px;
  border-radius: 0 10px 10px 0;
  margin: 18px 0;
}
.callout.warn { border-left-color: var(--warn); background: var(--warn-soft); }
.callout.note { border-left-color: var(--brand-gray); background: var(--surface-2); }
.callout p:last-child { margin-bottom: 0; }
.callout .label {
  display: block;
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 6px;
}
.callout.warn .label { color: var(--warn); }
.callout.note .label { color: var(--text-soft); }

/* ---------- Status pill ---------- */
.pill {
  display: inline-block;
  font-size: 0.72rem; font-weight: 700;
  padding: 3px 10px; border-radius: 999px;
  letter-spacing: 0.04em;
}
.pill.deferred { background: var(--warn-soft); color: var(--warn); border: 1px solid var(--warn); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: 16px 0; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; min-width: 480px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th {
  background: var(--brand-primary);
  color: #FFFFFF;
  font-weight: 600; font-size: 0.82rem; letter-spacing: 0.03em;
}
tr:nth-child(even) td { background: var(--surface-2); }
td code { white-space: nowrap; }
.inv-id { color: var(--accent); font-weight: 700; white-space: nowrap; }

/* ---------- Roadmap groups ---------- */
.road-group {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  margin-bottom: 16px;
}
.road-group h4 { margin: 0 0 10px; display: flex; align-items: center; gap: 10px; }
.tag {
  font-size: 0.68rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 3px 9px; border-radius: 6px;
}
.tag.planned  { background: var(--ok-soft); color: var(--ok); }
.tag.proposed { background: var(--accent-soft); color: var(--accent); }
.tag.ideas    { background: var(--surface-2); color: var(--text-soft); }

/* ---------- Landing page ---------- */
.landing main { padding-top: 48px; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 8px;
}
.doc-card {
  display: block;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.doc-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow); }
.doc-card .card-kicker {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 8px;
}
.doc-card h3 { border: 0; margin: 0 0 6px; padding: 0; color: var(--heading); font-size: 1.2rem; }
.doc-card p { margin: 0; color: var(--text-soft); font-size: 0.9rem; }
.doc-card .card-langs { margin-top: 14px; display: flex; gap: 8px; }
.doc-card .card-langs span {
  font-size: 0.72rem; font-weight: 700;
  padding: 3px 9px; border-radius: 6px;
  background: var(--surface-2); color: var(--text-soft);
}
.section-label {
  font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-soft); margin: 40px 0 14px;
}
.coming-soon { opacity: 0.55; cursor: default; pointer-events: none; }

/* ---------- Footer ---------- */
footer {
  max-width: 920px; margin: 0 auto;
  padding: 28px 24px 60px;
  color: var(--text-soft); font-size: 0.82rem; text-align: center;
}
.back-top { display: inline-block; margin-top: 8px; color: var(--accent); text-decoration: none; font-weight: 600; }

/* ---------- Responsive ---------- */
@media (max-width: 680px) {
  header.masthead { padding: 44px 18px 34px; }
  header.masthead h1 { font-size: 1.7rem; }
  main { padding: 0 14px 60px; }
  section { padding: 26px 20px; border-radius: 12px; }
  section > h2 { font-size: 1.3rem; }
  .section-sub { margin-left: 0; }
  nav.toc { padding: 20px; margin: -24px 0 36px; }
  nav.toc ol { grid-template-columns: 1fr; }
  h3 { font-size: 1.05rem; }
  .theme-toggle { top: 12px; right: 12px; padding: 7px 12px; }
}