:root {
  color-scheme: dark;
  --bg: #070b12;
  --panel: #0e1622;
  --panel-2: #121d2c;
  --text: #eef5ff;
  --muted: #91a1b7;
  --line: #26364d;
  --cyan: #5ee7ff;
  --blue: #77a7ff;
  --shadow: 0 18px 50px rgba(0,0,0,.28);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(94,231,255,.08), transparent 28rem),
    radial-gradient(circle at 100% 20%, rgba(119,167,255,.08), transparent 30rem),
    var(--bg);
  color: var(--text);
}

button, input, select { font: inherit; }
button, select, input[type="range"] { accent-color: var(--cyan); }
a { color: var(--cyan); }

.shell { width: min(760px, calc(100% - 32px)); margin: 0 auto; padding: 28px 0 48px; }
.brandline { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 54px; }
.brand { color: var(--text); text-decoration: none; font-weight: 750; letter-spacing: .02em; }
.badge { border: 1px solid var(--line); color: var(--muted); border-radius: 999px; padding: 6px 10px; font-size: 12px; }

.hero { margin-bottom: 26px; }
.eyebrow { margin: 0 0 8px; color: var(--cyan); font-size: 12px; letter-spacing: .18em; font-weight: 800; }
h1 { font-size: clamp(42px, 9vw, 74px); line-height: .95; margin: 0; letter-spacing: -.055em; }
.lead { margin: 18px 0 0; color: var(--muted); line-height: 1.8; max-width: 42rem; }

.panel { border: 1px solid var(--line); background: linear-gradient(180deg, rgba(18,29,44,.95), rgba(11,18,28,.95)); border-radius: 24px; box-shadow: var(--shadow); padding: 22px; margin-top: 18px; }
.timer-panel { padding: 26px; }
.display { text-align: center; padding: 22px 0 26px; }
.display__label { display: block; color: var(--muted); letter-spacing: .22em; font-size: 11px; font-weight: 800; }
.display__time { display: block; font-variant-numeric: tabular-nums; font-size: clamp(70px, 18vw, 116px); letter-spacing: -.055em; line-height: 1; margin: 8px 0 9px; }
.display__status { color: var(--muted); font-size: 14px; }

.preset-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
button { border: 1px solid var(--line); color: var(--text); background: var(--panel-2); border-radius: 14px; min-height: 48px; cursor: pointer; transition: border-color .15s ease, transform .08s ease, background .15s ease; }
button:hover { border-color: #44617f; }
button:active { transform: translateY(1px); }
.preset.is-active { background: rgba(94,231,255,.10); border-color: var(--cyan); color: #dcfbff; }

.custom-row { display: flex; align-items: center; gap: 12px; margin-top: 18px; }
.custom-row > label { color: var(--muted); min-width: 74px; }
.input-wrap { display: flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: #09111b; border-radius: 12px; padding: 0 12px; }
.input-wrap input { width: 92px; min-height: 44px; background: transparent; border: 0; outline: 0; color: var(--text); font-variant-numeric: tabular-nums; }
.input-wrap span { color: var(--muted); }
.text-button { min-height: 44px; padding: 0 16px; }
.hint { color: var(--muted); font-size: 12px; margin: 8px 0 0 86px; }

.primary-actions { display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: 10px; margin-top: 22px; }
.primary { background: linear-gradient(135deg, var(--cyan), var(--blue)); color: #03111c; border: 0; font-weight: 900; }
.primary.is-running { background: linear-gradient(135deg, #ffd36b, #ff9e80); }
.secondary { background: #0b1420; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 18px; }
.stats > div { background: #09111b; border: 1px solid #1b2a3c; border-radius: 14px; padding: 13px 14px; }
.stats span { display: block; color: var(--muted); font-size: 10px; letter-spacing: .14em; }
.stats strong { display: block; margin-top: 4px; font-variant-numeric: tabular-nums; }

.section-head { display: flex; justify-content: space-between; gap: 16px; align-items: end; }
h2 { margin: 0; font-size: 22px; }
.setting-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 18px; }
.field { display: grid; gap: 8px; color: var(--muted); font-size: 13px; }
.field select { width: 100%; min-height: 46px; color: var(--text); background: #09111b; border: 1px solid var(--line); border-radius: 12px; padding: 0 12px; }
.field input[type="range"] { width: 100%; }
.field output { color: var(--text); font-variant-numeric: tabular-nums; }
.checkline { grid-column: 1 / -1; display: flex; align-items: center; gap: 10px; color: var(--text); }
.checkline input { width: 18px; height: 18px; }
.checkline small { color: var(--muted); margin-left: 4px; }

.shortcuts h2 { margin-bottom: 16px; }
.shortcut-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
.shortcut-grid div { display: flex; align-items: center; gap: 12px; color: var(--muted); }
kbd { min-width: 54px; text-align: center; background: #09111b; border: 1px solid var(--line); border-bottom-color: #41536c; border-radius: 8px; color: var(--text); padding: 7px 9px; font-size: 12px; box-shadow: inset 0 -1px 0 #41536c; }

footer { color: var(--muted); font-size: 12px; line-height: 1.7; padding: 26px 4px 0; }
footer p { margin: 3px 0; }

@media (max-width: 600px) {
  .shell { width: min(100% - 20px, 760px); padding-top: 18px; }
  .brandline { margin-bottom: 36px; }
  .panel, .timer-panel { padding: 18px; border-radius: 20px; }
  .primary-actions { grid-template-columns: 1fr 1fr; }
  .primary-actions .primary { grid-column: 1 / -1; }
  .custom-row { flex-wrap: wrap; }
  .hint { margin-left: 0; }
  .setting-grid, .shortcut-grid { grid-template-columns: 1fr; }
  .stats { gap: 7px; }
  .stats > div { padding: 11px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}