:root {
  color-scheme: light;
  --color-bg: #f6f8f5;
  --color-surface: #ffffff;
  --color-surface-muted: #edf2ed;
  --color-ink: #202820;
  --color-muted: #5d6a5f;
  --color-line: #d8e1d8;
  --color-brand: #28634d;
  --color-brand-strong: #1e4d3c;
  --color-brand-soft: #dcece2;
  --color-accent: #e5a83c;
  --color-danger: #a34338;
  --shadow-soft: 0 10px 30px rgba(32, 40, 32, 0.08);
  --radius-sm: 0.5rem;
  --radius-md: 0.85rem;
  --radius-lg: 1.25rem;
  --content-width: 72rem;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { font-size: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

a { color: var(--color-brand-strong); text-underline-offset: 0.18em; }
a:hover { color: var(--color-brand); }
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; }
button, input, select, textarea { font: inherit; }
button, .button { min-height: 2.75rem; }

.site-shell { min-height: 100vh; display: flex; flex-direction: column; }
.site-header {
  position: sticky; top: 0; z-index: 10;
  border-bottom: 1px solid var(--color-line);
  background: rgba(246, 248, 245, 0.94);
  backdrop-filter: blur(12px);
}
.header-inner, .container { width: min(calc(100% - 2rem), var(--content-width)); margin-inline: auto; }
.header-inner { min-height: 4.5rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { color: var(--color-ink); font-weight: 800; text-decoration: none; letter-spacing: 0.02em; }
.brand small { display: block; color: var(--color-muted); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; }
.site-nav { display: flex; flex-wrap: wrap; gap: 0.85rem 1.25rem; font-size: 0.95rem; }
.site-nav a { color: var(--color-muted); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--color-brand-strong); }

.main { flex: 1; padding-block: 3rem 5rem; }
.page-intro { max-width: 45rem; margin-bottom: 2rem; }
.eyebrow { margin: 0 0 0.35rem; color: var(--color-brand); font-size: 0.8rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.3; letter-spacing: -0.02em; }
h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { margin: 0 0 0.65rem; font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { margin: 0 0 0.45rem; font-size: 1.15rem; }
.lead { color: var(--color-muted); font-size: 1.08rem; }

.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); gap: 1rem; }
.tool-card { display: flex; min-height: 12rem; flex-direction: column; padding: 1.25rem; border: 1px solid var(--color-line); border-radius: var(--radius-md); background: var(--color-surface); box-shadow: var(--shadow-soft); }
.tool-card:hover { border-color: var(--color-brand); transform: translateY(-2px); transition: transform 160ms ease, border-color 160ms ease; }
.tool-card p { margin: 0; color: var(--color-muted); }
.tool-card .button { margin-top: auto; align-self: flex-start; }
.tool-icon { width: 2.75rem; height: 2.75rem; display: grid; place-items: center; margin-bottom: 1rem; border-radius: 0.75rem; background: var(--color-brand-soft); color: var(--color-brand-strong); font-weight: 800; }
.tag { display: inline-flex; width: fit-content; margin-bottom: 0.65rem; padding: 0.12rem 0.55rem; border-radius: 999px; background: var(--color-surface-muted); color: var(--color-muted); font-size: 0.78rem; font-weight: 700; }

.button { display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem; padding: 0.5rem 0.9rem; border: 1px solid transparent; border-radius: var(--radius-sm); background: var(--color-brand); color: #fff; cursor: pointer; font-weight: 700; text-decoration: none; }
.button:hover { background: var(--color-brand-strong); color: #fff; }
.button.secondary { border-color: var(--color-line); background: var(--color-surface); color: var(--color-brand-strong); }
.button.secondary:hover { border-color: var(--color-brand); background: var(--color-brand-soft); }
.button.danger { background: var(--color-danger); }

.tool-layout { display: grid; grid-template-columns: minmax(13rem, 18rem) minmax(0, 1fr); gap: 1.25rem; align-items: start; }
.panel { padding: 1.25rem; border: 1px solid var(--color-line); border-radius: var(--radius-md); background: var(--color-surface); box-shadow: var(--shadow-soft); }
.panel + .panel { margin-top: 1rem; }
.control-stack { display: grid; gap: 0.75rem; }
label { display: grid; gap: 0.3rem; color: var(--color-ink); font-weight: 700; }
input, select, textarea { width: 100%; border: 1px solid #b9c8bb; border-radius: var(--radius-sm); background: #fff; color: var(--color-ink); padding: 0.6rem 0.7rem; }
input:focus, select:focus, textarea:focus { border-color: var(--color-brand); outline: 3px solid var(--color-brand-soft); }
.button-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.result-area { min-height: 18rem; display: grid; place-items: center; border: 2px dashed var(--color-line); border-radius: var(--radius-md); background: var(--color-surface-muted); text-align: center; }
.result-area strong { display: block; font-size: clamp(2rem, 8vw, 5rem); line-height: 1.1; }
.clock-page { padding-block: 1.5rem 3rem; }
.clock-topbar { width: min(calc(100% - 2rem), var(--content-width)); display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin: 0 auto 0.5rem; }
.clock-topbar a { font-size: 0.9rem; }
.clock-page .page-intro { margin-bottom: 0.5rem; }
.clock-page .page-intro h1 { font-size: clamp(1.35rem, 3vw, 2rem); }
.clock-page .page-intro .lead { display: none; }
.clock-stage { min-height: 0; height: min(calc(100svh - 12rem), 52rem); display: grid; place-items: center; padding: clamp(1rem, 4vw, 3rem); border: 1px solid var(--color-line); border-radius: var(--radius-lg); background: var(--color-surface); box-shadow: var(--shadow-soft); }
.analog-clock-canvas { display: block; width: min(100%, 42rem); height: auto; aspect-ratio: 1 / 1.125; }
.clock-options { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 0.75rem 1.25rem; margin-top: 1rem; }
.clock-options label { display: flex; grid-template-columns: none; align-items: center; gap: 0.55rem; font-weight: 600; }
.clock-options input[type="checkbox"] { width: 1.2rem; height: 1.2rem; accent-color: var(--color-brand); }
.zoom-control { display: flex; align-items: center; gap: 0.6rem; }
.zoom-control input[type="range"] { width: min(15rem, 58vw); min-height: 2.75rem; padding: 0; accent-color: var(--color-brand); cursor: pointer; touch-action: pan-x; }
.zoom-control input[type="range"]::-webkit-slider-runnable-track { height: 0.55rem; border-radius: 999px; background: var(--color-line); }
.zoom-control input[type="range"]::-webkit-slider-thumb { width: 1.5rem; height: 1.5rem; margin-top: -0.475rem; border: 3px solid var(--color-surface); border-radius: 50%; background: var(--color-brand); box-shadow: 0 1px 4px rgba(32, 40, 32, 0.25); -webkit-appearance: none; }
.zoom-control input[type="range"]::-moz-range-track { height: 0.55rem; border-radius: 999px; background: var(--color-line); }
.zoom-control input[type="range"]::-moz-range-thumb { width: 1.5rem; height: 1.5rem; border: 3px solid var(--color-surface); border-radius: 50%; background: var(--color-brand); box-shadow: 0 1px 4px rgba(32, 40, 32, 0.25); }
.zoom-value { min-width: 3.5rem; color: var(--color-brand-strong); font-variant-numeric: tabular-nums; font-weight: 800; }

.notice { padding: 0.9rem 1rem; border-left: 4px solid var(--color-accent); border-radius: var(--radius-sm); background: #fff8e9; }
.muted { color: var(--color-muted); }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.ad-slot { min-height: 5rem; display: grid; place-items: center; margin-block: 1.5rem; border: 1px dashed var(--color-line); border-radius: var(--radius-sm); color: var(--color-muted); font-size: 0.85rem; }
.site-footer { border-top: 1px solid var(--color-line); padding-block: 1.5rem; color: var(--color-muted); font-size: 0.9rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }

@media (max-width: 700px) {
  .main { padding-block: 2rem 3rem; }
  .clock-page { padding-block: 0.75rem 2rem; }
  .clock-topbar { width: min(calc(100% - 1.5rem), var(--content-width)); }
  .header-inner { align-items: flex-start; flex-direction: column; padding-block: 0.85rem; }
  .site-nav { gap: 0.4rem 0.9rem; }
  .tool-layout { grid-template-columns: 1fr; }
  .result-area { min-height: 14rem; }
  .clock-stage { height: min(calc(100svh - 10rem), 42rem); padding: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}