:root {
  --white: #ffffff;
  --off: #f7f6f3;
  --ink: #1c1c1e;
  --ink-light: #3a3a3c;
  --ink-muted: #8a8a8e;
  --border: #dedad4;
  --border-light: #eeecea;
  --navy: #1a2e4a;
  --navy-mid: #2c4a6e;
  --navy-light: #e8edf5;
  --navy-subtle: #d0daea;
  --green: #15803d;
  --green-light: #f0fdf4;
  --amber: #92400e;
  --amber-light: #fffbeb;
}

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

body {
  background: var(--white);
  color: var(--ink);
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 300;
  line-height: 1.8;
  font-size: 15px;
}

/* ── HEADER ── */
.site-header {
  border-bottom: 2px solid var(--navy);
  padding: 0 40px;
  background: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: stretch;
}
.site-logo {
  font-family: 'Noto Serif JP', serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--navy);
  padding: 18px 28px 18px 0;
  border-right: 1px solid var(--border);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.site-logo-dot { width: 6px; height: 6px; background: var(--navy); border-radius: 50%; flex-shrink: 0; }
.tab-nav { display: flex; overflow-x: auto; scrollbar-width: none; padding: 0 20px; }
.tab-nav::-webkit-scrollbar { display: none; }
.tab-btn {
  padding: 0 18px; height: 54px; border: none; background: transparent;
  font-family: 'Noto Sans JP', sans-serif; font-size: 13px; font-weight: 400;
  cursor: pointer; color: var(--ink-muted); white-space: nowrap;
  transition: color 0.15s; border-bottom: 2px solid transparent; margin-bottom: -2px;
  text-decoration: none; display: inline-flex; align-items: center;
}
.tab-btn.active { color: var(--navy); border-bottom-color: var(--navy); font-weight: 500; }
.tab-btn:hover { color: var(--ink); }

/* ── HERO ── */
.hero { background: var(--navy); padding: 0 40px; overflow: hidden; position: relative; }
.hero-inner {
  max-width: 900px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 360px; gap: 48px;
  align-items: center; padding: 64px 0;
}
.hero-label {
  font-family: 'DM Mono', monospace; font-size: 10.5px;
  color: rgba(255,255,255,0.4); letter-spacing: 0.12em;
  text-transform: uppercase; margin-bottom: 20px;
}
.hero h1 {
  font-family: 'Noto Serif JP', serif; font-size: clamp(24px, 3.5vw, 40px);
  font-weight: 700; line-height: 1.3; margin-bottom: 18px; color: #ffffff;
}
.hero-desc { font-size: 14px; color: rgba(255,255,255,0.6); max-width: 480px; line-height: 1.8; margin-bottom: 28px; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: 'DM Mono', monospace; font-size: 10px; letter-spacing: 0.06em;
  color: rgba(255,255,255,0.5); border: 1px solid rgba(255,255,255,0.15); padding: 4px 12px;
}
.hero-visual { display: flex; align-items: center; justify-content: center; }

/* ── CONTAINER ── */
.container { max-width: 840px; margin: 0 auto; padding: 64px 40px; }

/* ── TYPOGRAPHY ── */
h2 { font-family: 'Noto Serif JP', serif; font-size: clamp(20px, 3vw, 30px); font-weight: 700; line-height: 1.35; margin-bottom: 14px; color: var(--ink); }
h3 {
  font-family: 'Noto Serif JP', serif; font-size: 17px; font-weight: 600;
  margin: 56px 0 16px; color: var(--navy); padding-bottom: 10px;
  border-bottom: 1px solid var(--navy-subtle);
}
h4 { font-family: 'DM Mono', monospace; font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 10px; }
p { margin-bottom: 16px; line-height: 1.85; color: var(--ink-light); }
p:last-child { margin-bottom: 0; }
strong { font-weight: 600; color: var(--ink); }
.lead { font-size: 16px; color: var(--ink); line-height: 1.8; }
hr.rule { border: none; border-top: 1px solid var(--border); margin: 0 0 36px; }

/* ── NOTE ── */
.note { border: 1px solid var(--border); padding: 18px 22px; margin: 24px 0; background: var(--off); }
.note.navy { background: var(--navy-light); border-color: var(--navy-subtle); }
.note.green { background: var(--green-light); border-color: #bbf7d0; }
.note.amber { background: var(--amber-light); border-color: #fde68a; }
.note-label { font-family: 'DM Mono', monospace; font-size: 9.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 7px; display: block; }
.note.navy .note-label { color: var(--navy-mid); }
.note.green .note-label { color: var(--green); }
.note.amber .note-label { color: var(--amber); }
.note p { color: var(--ink-light); font-size: 14px; }

/* ── SECTION BANNER ── */
.section-banner { background: var(--navy); padding: 28px 40px; margin: 0 -40px 40px; display: flex; align-items: center; gap: 20px; }
.section-banner-text { font-family: 'Noto Serif JP', serif; font-size: 15px; font-weight: 600; color: rgba(255,255,255,0.9); line-height: 1.5; }
.section-banner-sub { font-size: 12px; color: rgba(255,255,255,0.4); font-family: 'DM Mono', monospace; letter-spacing: 0.05em; margin-top: 2px; }

/* ── FEATURE LIST ── */
.feature-list { display: grid; gap: 1px; background: var(--border); border: 1px solid var(--border); margin: 24px 0; }
.feature-item { background: var(--white); padding: 22px 28px; display: grid; grid-template-columns: 28px 1fr; gap: 18px; align-items: start; transition: background 0.1s; }
.feature-item:hover { background: var(--off); }
.feature-marker { font-family: 'DM Mono', monospace; font-size: 10px; color: var(--navy); padding-top: 4px; font-weight: 500; }
.feature-item h5 { font-family: 'Noto Serif JP', serif; font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 5px; }
.feature-item p { font-size: 13px; color: var(--ink-muted); margin: 0; line-height: 1.65; }

/* ── PERSONA GRID ── */
.persona-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); border: 1px solid var(--border); margin: 24px 0; }
.persona-item { background: var(--white); padding: 24px 28px; border-left: 3px solid transparent; transition: border-color 0.15s, background 0.1s; }
.persona-item:hover { border-left-color: var(--navy); background: var(--off); }
.persona-label { font-family: 'DM Mono', monospace; font-size: 9.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--navy-mid); margin-bottom: 10px; }
.persona-item h5 { font-family: 'Noto Serif JP', serif; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 7px; line-height: 1.4; }
.persona-item p { font-size: 12.5px; color: var(--ink-muted); margin: 0; line-height: 1.65; }

/* ── PRICING ── */
.pricing-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); margin: 24px 0; }
.price-item { background: var(--white); padding: 28px; }
.price-item.highlight { background: var(--navy); }
.price-tier { font-family: 'DM Mono', monospace; font-size: 9.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 12px; }
.price-item.highlight .price-tier { color: rgba(255,255,255,0.45); }
.price-value { font-family: 'Noto Serif JP', serif; font-size: 28px; font-weight: 700; color: var(--ink); margin-bottom: 4px; }
.price-item.highlight .price-value { color: #ffffff; }
.price-unit { font-size: 13px; font-weight: 300; color: var(--ink-muted); }
.price-item.highlight .price-unit { color: rgba(255,255,255,0.45); }
.price-desc { font-size: 12px; color: var(--ink-muted); margin-top: 8px; line-height: 1.55; }
.price-item.highlight .price-desc { color: rgba(255,255,255,0.5); }

/* ── TABLE ── */
.table-wrap { overflow-x: auto; margin: 24px 0; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead tr { border-top: 2px solid var(--navy); border-bottom: 1px solid var(--navy-subtle); }
th { font-family: 'DM Mono', monospace; font-size: 9.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--navy); padding: 11px 16px; text-align: left; font-weight: 500; background: var(--navy-light); }
td { padding: 13px 16px; border-bottom: 1px solid var(--border-light); color: var(--ink-light); vertical-align: top; line-height: 1.5; }
td strong { color: var(--ink); }
td small { display: block; color: var(--ink-muted); font-size: 11px; margin-top: 2px; }
tr.highlight-row td { background: var(--navy-light); }
.yes { color: var(--navy); font-weight: 500; }
.no { color: var(--ink-muted); }

/* ── UI MOCK ── */
.ui-mock { border: 1px solid var(--border); background: var(--off); margin: 28px 0; overflow: hidden; }
.ui-titlebar { background: var(--navy); padding: 10px 16px; display: flex; align-items: center; gap: 6px; }
.ui-dot { width: 9px; height: 9px; border-radius: 50%; background: rgba(255,255,255,0.18); }
.ui-title { font-family: 'DM Mono', monospace; font-size: 11px; color: rgba(255,255,255,0.4); margin-left: 10px; }
.ui-panes { display: grid; grid-template-columns: 1fr 1fr; }
.ui-pane { padding: 20px 24px; }
.ui-pane + .ui-pane { border-left: 1px solid var(--border); }
.ui-pane-label { font-family: 'DM Mono', monospace; font-size: 9.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--navy-mid); margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.ui-line { font-size: 12.5px; color: var(--ink-light); line-height: 1.8; margin-bottom: 3px; }
.ui-speaker { font-weight: 500; color: var(--navy); }
.ui-note-item { font-size: 12.5px; color: var(--ink-light); line-height: 1.7; margin-bottom: 6px; padding-left: 14px; position: relative; }
.ui-note-item::before { content: '—'; position: absolute; left: 0; color: var(--border); }
.ui-tag { display: inline-block; font-family: 'DM Mono', monospace; font-size: 9px; letter-spacing: 0.05em; color: var(--navy); border: 1px solid var(--navy-subtle); background: var(--navy-light); padding: 1px 6px; margin-right: 5px; text-transform: uppercase; }

/* ── STEPS ── */
.steps { margin: 24px 0; }
.step { display: grid; grid-template-columns: 40px 1fr; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--border-light); align-items: start; }
.step:last-child { border-bottom: none; }
.step-n { font-family: 'DM Mono', monospace; font-size: 11px; color: var(--white); background: var(--navy); width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px; }
.step-content h5 { font-family: 'Noto Serif JP', serif; font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 7px; }
.step-content p { font-size: 13.5px; margin: 0; line-height: 1.75; }
code { font-family: 'DM Mono', monospace; font-size: 12px; background: var(--navy-light); border: 1px solid var(--navy-subtle); padding: 1px 6px; color: var(--navy); }

/* ── PROMPT CARD ── */
.prompt-card { border: 1px solid var(--border); margin: 20px 0; overflow: hidden; }
.prompt-header { display: flex; justify-content: space-between; align-items: center; padding: 11px 18px; border-bottom: 1px solid var(--border); background: var(--navy); gap: 16px; }
.prompt-title { font-family: 'DM Mono', monospace; font-size: 11px; color: rgba(255,255,255,0.85); font-weight: 500; }
.prompt-tag { font-family: 'DM Mono', monospace; font-size: 9.5px; color: rgba(255,255,255,0.38); white-space: nowrap; }
.prompt-body { padding: 20px 24px; font-family: 'DM Mono', monospace; font-size: 12.5px; color: var(--ink-light); line-height: 1.8; white-space: pre-wrap; word-break: break-word; background: var(--off); }
.kw { color: var(--ink); font-weight: 500; }
.var-text { color: var(--navy-mid); }
.comment { color: var(--ink-muted); font-style: italic; }

/* ── FOOTER ── */
footer { background: var(--navy); padding: 32px 40px; font-family: 'DM Mono', monospace; font-size: 10.5px; color: rgba(255,255,255,0.3); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ── RESPONSIVE ── */
@media (max-width: 700px) {
  .site-header { padding: 0 16px; }
  .hero { padding: 0 20px; }
  .hero-inner { grid-template-columns: 1fr; padding: 48px 0 32px; }
  .hero-visual { display: none; }
  .container { padding: 48px 20px; }
  .section-banner { margin: 0 -20px 36px; padding: 24px 20px; }
  .persona-grid { grid-template-columns: 1fr; }
  .pricing-strip { grid-template-columns: 1fr; }
  .ui-panes { grid-template-columns: 1fr; }
  .ui-pane + .ui-pane { border-left: none; border-top: 1px solid var(--border); }
  footer { padding: 24px 20px; flex-direction: column; }
}