:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --text: #182033;
  --muted: #687386;
  --border: #d9e0e9;
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-soft: #f1eaff;
  --accent: #0f766e;
  --accent-soft: #e7f8f6;
  --danger: #b42318;
  --focus: rgba(124, 58, 237, 0.22);
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius: 16px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; min-width: 0; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif; line-height: 1.7; }
body.dark {
  --bg: #101322;
  --surface: #191d2f;
  --surface-soft: #131728;
  --text: #f4f2fb;
  --muted: #b5b5c7;
  --border: #363b53;
  --primary: #bd9cff;
  --primary-hover: #ccb3ff;
  --primary-soft: #342653;
  --accent: #87d9cf;
  --accent-soft: #183a37;
  --danger: #ffaaa2;
  --focus: rgba(189, 156, 255, 0.24);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
button, select { font: inherit; }
button { cursor: pointer; }
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.header-inner, .page-shell, .site-footer { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.header-inner { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; padding: 28px 0 24px; }
.eyebrow { margin: 0 0 4px; color: var(--primary); font-size: 0.86rem; font-weight: 800; }
h1, h2, h3, p, span, strong { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(1.85rem, 4vw, 2.5rem); line-height: 1.25; }
.lead { max-width: 800px; margin: 10px 0 0; color: var(--muted); }
.page-shell { padding: 28px 0 56px; }
.tool-grid { display: grid; grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr); gap: 24px; align-items: start; }
.panel, .content-section { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel { padding: 22px; min-width: 0; }
.panel-heading h2, .content-section h2 { margin: 0; line-height: 1.35; }
.panel-heading p { margin: 5px 0 18px; color: var(--muted); font-size: 0.92rem; }
.input-label { display: block; margin: 14px 0 7px; font-weight: 800; }
select { width: 100%; min-height: 46px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface-soft); color: var(--text); padding: 9px 11px; outline: none; }
select:focus, button:focus-visible, summary:focus-visible { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus); outline: none; }
.theme-toggle, .primary-button, .secondary-button, .ghost-button { min-height: 44px; border-radius: 10px; padding: 10px 16px; font-weight: 800; border: 1px solid transparent; }
.theme-toggle, .ghost-button { background: var(--surface-soft); color: var(--text); border-color: var(--border); }
.primary-button { background: var(--primary); color: #fff; }
body.dark .primary-button { color: #151126; }
.primary-button:hover { background: var(--primary-hover); }
.secondary-button { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
.main-generate { width: 100%; margin-top: 20px; min-height: 54px; font-size: 1.03rem; }
.notice-box, .important-note { margin-top: 18px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface-soft); padding: 14px; }
.notice-box p, .important-note p { margin: 5px 0 0; color: var(--muted); font-size: 0.9rem; }
.cards-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.result-card { min-height: 235px; border: 1px solid var(--border); border-radius: 16px; padding: 22px; display: flex; flex-direction: column; justify-content: space-between; }
.topic-card { background: var(--primary-soft); }
.constraint-card { background: var(--accent-soft); }
.card-label { font-weight: 900; color: var(--muted); font-size: 0.84rem; }
.card-main { margin: 20px 0; font-weight: 900; font-size: clamp(1.35rem, 3vw, 2rem); line-height: 1.45; }
.card-meta { color: var(--muted); font-size: 0.86rem; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; }
.pill { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); padding: 5px 10px; font-size: 0.8rem; font-weight: 800; }
.result-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 16px; }
.status-message { min-height: 1.5em; margin: 10px 0 0; color: var(--accent); font-weight: 800; font-size: 0.9rem; }
.status-message.error { color: var(--danger); }
.content-section { margin-top: 28px; padding: 26px; }
.content-section > p { margin: 10px 0 0; color: var(--muted); }
.info-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 22px; }
.info-grid article { border: 1px solid var(--border); border-radius: 12px; background: var(--surface-soft); padding: 16px; }
.info-grid h3 { margin: 0; font-size: 1rem; }
.info-grid p { margin: 7px 0 0; color: var(--muted); font-size: 0.93rem; }
.faq-section details { border-top: 1px solid var(--border); padding: 14px 0; }
.faq-section details:first-of-type { margin-top: 16px; }
.faq-section summary { cursor: pointer; font-weight: 800; }
.faq-section details p { margin: 9px 0 0; color: var(--muted); }
.site-footer { padding: 0 0 28px; color: var(--muted); text-align: center; font-size: 0.86rem; }
@media (max-width: 900px) { .tool-grid { grid-template-columns: 1fr; } }
@media (max-width: 720px) { .header-inner { flex-direction: column; } .theme-toggle { width: 100%; } .cards-grid { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .header-inner, .page-shell, .site-footer { width: min(100% - 22px, 1180px); } .panel, .content-section { padding: 18px; } .result-actions { display: grid; grid-template-columns: 1fr; } .result-actions button { width: 100%; } .info-grid { grid-template-columns: 1fr; } .result-card { min-height: 210px; } }