:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5d6678;
  --paper: #fbf7ef;
  --card: #ffffff;
  --line: #e5dccd;
  --leaf: #2f855a;
  --sky: #4f8cff;
  --amber: #f59e0b;
  --violet: #6d5dfc;
  --shadow: 0 24px 60px rgba(35, 43, 70, 0.14);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at 12% 4%, #dcfce7 0, transparent 30rem), radial-gradient(circle at 88% 10%, #dbeafe 0, transparent 28rem), linear-gradient(135deg, #fffaf0 0%, #f1f7ff 100%);
  color: var(--ink);
}
main { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.hero { padding: 24px 0 36px; }
.crumb { display: flex; justify-content: space-between; gap: 16px; align-items: center; color: var(--muted); font-size: 0.95rem; margin-bottom: 28px; }
.crumb a { color: var(--ink); text-decoration: none; font-weight: 850; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, 450px); gap: 28px; align-items: center; }
.eyebrow { color: #276749; font-weight: 950; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.82rem; }
h1 { font-size: clamp(2.4rem, 7vw, 5.1rem); line-height: 0.94; margin: 0 0 18px; letter-spacing: -0.07em; }
.lede { font-size: clamp(1.05rem, 2vw, 1.35rem); color: var(--muted); max-width: 59ch; line-height: 1.55; }
.preset-row, .custom-row, .actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.preset-row { margin: 26px 0 18px; }
.pill, button { border: 0; font: inherit; cursor: pointer; }
.pill { border: 2px solid var(--line); background: rgba(255,255,255,0.84); color: var(--ink); padding: 11px 14px; border-radius: 999px; font-weight: 900; box-shadow: 0 8px 18px rgba(31, 41, 55, 0.06); }
.pill.active { background: var(--ink); border-color: var(--ink); color: #fff; }
.custom-label { display: block; margin-bottom: 8px; font-weight: 950; }
input { width: 104px; border: 2px solid var(--line); border-radius: 14px; padding: 12px; font: inherit; font-weight: 900; color: var(--ink); background: #fff; }
.timer-card, .info-card, .tips, .related, .faq { background: rgba(255,255,255,0.93); border: 1px solid rgba(229, 220, 205, 0.95); border-radius: 30px; box-shadow: var(--shadow); }
.timer-card { padding: clamp(20px, 4vw, 34px); text-align: center; }
.book-wrap { position: relative; width: min(78vw, 312px); height: min(78vw, 312px); margin: 0 auto 18px; border-radius: 38px; overflow: hidden; background: linear-gradient(135deg, #eef6ff, #fffdf7); border: 12px solid #172033; box-shadow: inset 0 0 0 2px rgba(255,255,255,.72); }
.book-wrap::before { content: ""; position: absolute; inset: 28px 50% 28px 28px; border-radius: 18px 0 0 18px; background: rgba(255,255,255,.72); border-right: 2px solid rgba(23,32,51,.12); z-index: 1; }
.book-wrap::after { content: ""; position: absolute; inset: 28px 28px 28px 50%; border-radius: 0 18px 18px 0; background: rgba(255,255,255,.55); z-index: 1; }
.book-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 0%; background: linear-gradient(0deg, rgba(47,133,90,.86), rgba(79,140,255,.78)); transition: height 0.35s ease, background 0.35s ease; z-index: 0; }
.time { position: absolute; inset: 0; display: grid; place-items: center; font-size: clamp(3rem, 11vw, 5.2rem); font-weight: 950; letter-spacing: -0.08em; z-index: 2; text-shadow: 0 2px 0 rgba(255,255,255,.72); }
.timer-card h2 { font-size: clamp(1.45rem, 3vw, 2rem); margin: 8px 0; }
.timer-card p { color: var(--muted); line-height: 1.5; margin: 0 auto 16px; max-width: 36ch; }
.prompt-box { background: #f1f8ff; border: 2px dashed #9cc4ff; border-radius: 18px; padding: 14px; margin: 16px 0 20px; font-size: 1.05rem; font-weight: 900; }
.primary, .secondary { border-radius: 16px; padding: 13px 18px; font-weight: 950; }
.primary { background: var(--leaf); color: white; min-width: 170px; box-shadow: 0 12px 24px rgba(47, 133, 90, 0.24); }
.secondary { background: #edf4ff; color: #17427b; }
.small { padding: 11px 13px; }
.content-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 18px 0; }
.info-card, .tips, .related, .faq { padding: clamp(20px, 3vw, 28px); }
h2 { letter-spacing: -0.03em; }
li { margin: 9px 0; color: var(--muted); line-height: 1.55; }
.tips, .related { margin-bottom: 18px; }
.tip-grid, .related-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.tip-grid div, .related-grid a { background: #f5fbff; border: 1px solid #dceeff; border-radius: 18px; padding: 16px; font-weight: 900; text-align: center; color: var(--ink); text-decoration: none; }
.related-grid a:hover { text-decoration: underline; }
.faq { margin-bottom: 38px; }
details { border-top: 1px solid var(--line); padding: 15px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 950; }
details p { color: var(--muted); line-height: 1.6; }
body.running .book-progress { background: linear-gradient(0deg, rgba(79,140,255,.82), rgba(109,93,252,.72)); }
body.final-minute .book-progress { background: linear-gradient(0deg, rgba(245,158,11,.9), rgba(252,211,77,.72)); }
body.done .book-progress { background: linear-gradient(0deg, rgba(47,133,90,.95), rgba(134,239,172,.78)); }
@media (max-width: 820px) {
  .hero-grid, .content-grid { grid-template-columns: 1fr; }
  .crumb { align-items: flex-start; flex-direction: column; }
  .tip-grid, .related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
  main { width: min(100% - 20px, 1120px); }
  .preset-row .pill { width: 100%; }
  .primary, .secondary.small { flex: 1; }
  .actions .primary, .actions .secondary { width: 100%; }
  .tip-grid, .related-grid { grid-template-columns: 1fr; }
}
.site-nav{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:16px;margin:8px 0 24px;padding:12px 16px;background:rgba(255,255,255,.86);border:1px solid #e1e5ee;border-radius:24px;box-shadow:0 10px 24px rgba(22,31,54,.06);backdrop-filter:blur(12px)}
.site-brand{display:inline-flex;align-items:center;gap:10px;color:#172033;text-decoration:none;font-weight:800}.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:12px;background:#172033;color:#fff;font-weight:900}.site-nav a:not(.site-brand){color:#4b5565;text-decoration:none;font-weight:700;font-size:.95rem}.site-nav a:hover{text-decoration:underline}@media (max-width:640px){.site-nav{margin-top:8px;padding:10px 12px;border-radius:20px}.site-nav a:not(.site-brand){font-size:.9rem}.brand-mark{width:30px;height:30px}.site-brand span:last-child{max-width:180px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}}