/* 配色は :root のトークンだけで変える */

:root {
  color-scheme: light dark;

  --bg:          #f4f6f8;
  --surface:     #ffffff;
  --surface-2:   #eef1f5;
  --border:      #d8dee6;
  --border-soft: #e7ecf1;

  --text:        #16212e;
  --text-muted:  #5b6b7c;
  --text-faint:  #8a99a8;

  --accent:      #0b7285;
  --accent-hov:  #095c6b;
  --accent-soft: #e2f2f5;
  --accent-fg:   #ffffff;

  --ok:      #1a7f4b;
  --ok-soft: #e3f4ea;
  --warn:      #9a6510;
  --warn-soft: #fbf0da;
  --danger:      #a63232;
  --danger-soft: #fbe6e6;

  --radius:    10px;
  --radius-lg: 16px;
  --shadow:    0 1px 2px rgba(16,32,48,.06), 0 6px 20px rgba(16,32,48,.06);
  --shadow-lg: 0 2px 6px rgba(16,32,48,.08), 0 18px 44px rgba(16,32,48,.12);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
          "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;

  --wrap: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #10161d;
    --surface:     #18212b;
    --surface-2:   #1f2a36;
    --border:      #2c3a49;
    --border-soft: #243040;

    --text:        #e6edf4;
    --text-muted:  #9fb0c2;
    --text-faint:  #74869a;

    --accent:      #3aa8bd;
    --accent-hov:  #4fbdd1;
    --accent-soft: #17323a;
    --accent-fg:   #06222a;

    --ok:      #5ecf95;
    --ok-soft: #14301f;
    --warn:      #e0b062;
    --warn-soft: #33280f;
    --danger:      #f08a8a;
    --danger-soft: #331a1a;

    --shadow:    0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.3);
    --shadow-lg: 0 2px 6px rgba(0,0,0,.45), 0 18px 44px rgba(0,0,0,.4);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; display: block; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--accent); }
h1, h2, h3, h4 { line-height: 1.4; margin: 0; font-weight: 700; letter-spacing: .01em; }

.wrap { width: min(100% - 32px, var(--wrap)); margin-inline: auto; }
.stack > * + * { margin-top: var(--gap, 16px); }

.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  display: flex; align-items: center; gap: 12px;
  min-height: 58px;
  width: min(100% - 32px, var(--wrap)); margin-inline: auto;
}
.brand {
  display: flex; align-items: center; gap: 9px;
  font-weight: 700; text-decoration: none; color: var(--text);
  font-size: 15px; white-space: nowrap;
}
.brand__mark {
  width: 26px; height: 26px; border-radius: 7px; flex: none;
  background: var(--accent); color: var(--accent-fg);
  display: grid; place-items: center; font-size: 12px; font-weight: 800;
}
.site-header__spacer { flex: 1; }
.site-nav { display: flex; gap: 2px; }
.site-nav a {
  padding: 6px 11px; border-radius: 7px; text-decoration: none;
  color: var(--text-muted); font-size: 13.5px; font-weight: 600; white-space: nowrap;
}
.site-nav a:hover { background: var(--surface-2); color: var(--text); }
.site-nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

.demo-banner {
  background: var(--warn-soft); color: var(--warn);
  border-bottom: 1px solid color-mix(in srgb, var(--warn) 25%, transparent);
  font-size: 12.5px; font-weight: 600; text-align: center;
  padding: 7px 16px; line-height: 1.5;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 17px; border-radius: 9px; border: 1px solid transparent;
  background: var(--accent); color: var(--accent-fg);
  font-size: 14px; font-weight: 700; cursor: pointer; text-decoration: none;
  transition: background .15s, border-color .15s, opacity .15s;
}
.btn:hover { background: var(--accent-hov); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn--block { width: 100%; }
.btn--danger { background: var(--danger); }
.btn--ok { background: var(--ok); }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
}
.card__pad { padding: 20px; }

.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 9px; border-radius: 999px;
  font-size: 11.5px; font-weight: 700; line-height: 1.6;
  background: var(--surface-2); color: var(--text-muted);
  border: 1px solid var(--border-soft); white-space: nowrap;
}
.badge--accent { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.badge--ok     { background: var(--ok-soft);     color: var(--ok);     border-color: transparent; }
.badge--warn   { background: var(--warn-soft);   color: var(--warn);   border-color: transparent; }
.badge--danger { background: var(--danger-soft); color: var(--danger); border-color: transparent; }

.field { display: block; }
.field__label { display: block; font-size: 12.5px; font-weight: 700; color: var(--text-muted); margin-bottom: 6px; }
.input, .textarea {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: 9px;
  background: var(--surface); color: var(--text);
  font-size: 14.5px; line-height: 1.7;
}
.textarea { resize: vertical; min-height: 108px; }
.input:focus, .textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
.hint { font-size: 12px; color: var(--text-faint); line-height: 1.65; }

.modal[hidden] { display: none !important; }
.modal {
  position: fixed; inset: 0; z-index: 90;
  display: grid; place-items: center; padding: 16px;
  background: rgba(8,14,20,.55);
}
.modal__box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  width: min(100%, 480px); max-height: 90vh; overflow: auto; padding: 22px;
}

.note {
  border-radius: var(--radius); padding: 12px 14px;
  font-size: 13px; line-height: 1.7;
  background: var(--surface-2); border: 1px solid var(--border-soft); color: var(--text-muted);
}
.note--warn { background: var(--warn-soft); border-color: transparent; color: var(--warn); }
.note--accent { background: var(--accent-soft); border-color: transparent; color: var(--accent); }

.site-footer {
  margin-top: 56px; padding: 24px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--text-faint); font-size: 12.5px;
}

.muted { color: var(--text-muted); }
.faint { color: var(--text-faint); }
.center { text-align: center; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.mode-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-faint); flex: none;
}
.mode-dot--live { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent); }

.mode-option {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius);
  cursor: pointer;
}
.mode-option:hover { background: var(--surface-2); }
.mode-option input { margin-top: 5px; flex: none; }
.mode-option strong { display: block; font-size: 14px; }
.mode-option .hint { display: block; margin-top: 2px; }

.hint-bar {
  display: flex; gap: 11px; align-items: flex-start;
  padding: 12px 14px; margin: 14px 0 0;
  border-radius: var(--radius);
  background: var(--accent-soft); color: var(--accent);
  font-size: 13.5px; line-height: 1.75;
}
.hint-bar[hidden] { display: none !important; }
.hint-bar__icon { flex: none; font-size: 15px; line-height: 1.6; }
.hint-bar__body { flex: 1; min-width: 0; }
.hint-bar__body strong { display: block; margin-bottom: 2px; }
.hint-bar__body ol { margin: 6px 0 0; padding-left: 1.3em; }
.hint-bar__body li { margin: 2px 0; }
.hint-bar__close {
  flex: none; align-self: flex-start;
  border: 0; background: transparent; cursor: pointer;
  color: inherit; opacity: .65; font-size: 12px; padding: 2px 4px;
}
.hint-bar__close:hover { opacity: 1; text-decoration: underline; }

.welcome__steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.welcome__steps li { display: flex; gap: 12px; align-items: flex-start; }
.welcome__num {
  width: 26px; height: 26px; border-radius: 50%; flex: none;
  background: var(--accent); color: var(--accent-fg);
  display: grid; place-items: center; font-size: 12px; font-weight: 800;
}
.welcome__steps b { display: block; font-size: 14px; }
.welcome__steps span { font-size: 12.5px; color: var(--text-muted); line-height: 1.7; }

.consent {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface-2); font-size: 13px;
}
.consent > summary {
  cursor: pointer; padding: 12px 14px; font-weight: 700; font-size: 13.5px;
  list-style: revert;
}
.consent > summary:hover { color: var(--accent); }
.consent__list { margin: 0; padding: 0 14px 14px; }
.consent__list dt {
  font-weight: 700; font-size: 12px; color: var(--text-muted);
  margin-top: 12px; letter-spacing: .02em;
}
.consent__list dd { margin: 3px 0 0; line-height: 1.8; }

.site-who { display: inline-flex; align-items: center; gap: 7px; }
.site-who[hidden] { display: none !important; }