:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface2: #f1f5f9;
  --border: #e3e8f0;
  --text: #0f172a;
  --muted: #5b6878;
  --accent: #2563eb;
  --accent2: #1d4ed8;
  --success: #059669;
  --warn: #b45309;
  --radius: 12px;
  --star: #2563eb;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body { background: var(--bg); color: var(--text); font-family: 'Segoe UI', system-ui, sans-serif; min-height: 100vh; }

nav { background: var(--surface); border-bottom: 1px solid var(--border); padding: 0 20px; }
.nav-inner { max-width: 900px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 52px; }
.logo { font-weight: 700; font-size: 1.1rem; }
.nav-badge { font-size: .75rem; color: var(--muted); background: var(--surface2); border: 1px solid var(--border); padding: 3px 10px; border-radius: 20px; }

.container { max-width: 900px; margin: 0 auto; padding: 28px 20px; }

/* MODE TABS */
.mode-tabs { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.mode-tab { background: var(--surface2); border: 1px solid var(--border); color: var(--muted); padding: 10px 18px; border-radius: var(--radius); cursor: pointer; font-size: .875rem; font-weight: 500; transition: all .15s; }
.mode-tab:hover { color: var(--text); }
.mode-tab.active { background: rgba(37,99,235,.08); border-color: var(--accent); color: var(--accent); }
.mode-panel { display: none; }
.mode-panel.active { display: block; }

/* TIME CARD */
.time-card { background: linear-gradient(135deg, var(--surface) 0%, #eef2ff 100%); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; text-align: center; margin-bottom: 24px; }
.tc-label { font-size: 1rem; color: var(--muted); margin-bottom: 14px; }
.time-input { background: var(--surface2); border: 2px solid var(--accent); color: var(--accent); font-size: 2.5rem; font-weight: 700; padding: 12px 24px; border-radius: 12px; outline: none; font-family: 'Consolas', monospace; text-align: center; cursor: pointer; appearance: none; -webkit-appearance: none; }
.time-input:focus { border-color: var(--accent2); }
.tc-sub { font-size: .8rem; color: var(--muted); margin-top: 10px; }

/* RESULTS */
.results-label { font-size: .82rem; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 12px; }
.cycles-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin-bottom: 20px; }
.cycle-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 14px; text-align: center; cursor: pointer; transition: all .15s; }
.cycle-card:hover { border-color: var(--accent); background: var(--surface2); transform: translateY(-1px); }
.cycle-card.best { border-color: var(--success); background: linear-gradient(135deg, #ecfdf5, #d1fae5); }
.cycle-time { font-size: 1.5rem; font-weight: 700; color: var(--accent); font-family: monospace; }
.cycle-card.best .cycle-time { color: var(--success); }
.cycle-cycles { font-size: .8rem; color: var(--muted); margin-top: 4px; }
.cycle-hours { font-size: .78rem; color: var(--muted); margin-top: 2px; }
.best-badge { display: inline-block; background: var(--success); color: #0a1a12; font-size: .65rem; font-weight: 700; padding: 2px 6px; border-radius: 3px; text-transform: uppercase; letter-spacing: .05em; margin-top: 5px; }

/* NAP GRID */
.nap-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin-bottom: 20px; }
.nap-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; display: flex; align-items: center; gap: 14px; cursor: pointer; transition: border-color .15s, background .15s; }
.nap-card:hover { border-color: var(--accent); background: var(--surface2); }
.nap-icon { font-size: 1.8rem; flex-shrink: 0; }
.nap-info { flex: 1; }
.nap-time { font-size: 1.1rem; font-weight: 700; color: var(--accent); font-family: monospace; }
.nap-dur { font-size: .8rem; color: var(--muted); margin-top: 2px; }
.nap-type { font-size: .75rem; color: var(--muted); margin-top: 2px; }

/* TIP */
.tip-row { padding: 12px 16px; background: var(--surface2); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; font-size: .85rem; color: var(--muted); margin-bottom: 28px; }

/* INFO GRID */
.info-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.info-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.info-icon { font-size: 1.4rem; margin-bottom: 8px; }
.info-title { font-size: .85rem; font-weight: 700; margin-bottom: 8px; }
.info-body { font-size: .82rem; color: var(--muted); line-height: 1.6; }
.info-body ul { padding-left: 14px; }
.info-body li { margin-bottom: 4px; }
.stage-row { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.stage-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.stage-dot.n1 { background: #2563eb; }
.stage-dot.n2 { background: #2563eb; }
.stage-dot.n3 { background: #2563eb; }
.stage-dot.rem { background: #f472b6; }
.age-row { display: flex; justify-content: space-between; padding: 2px 0; border-bottom: 1px solid var(--border); font-size: .8rem; }
.age-row:last-child { border-bottom: none; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

@media (max-width: 600px) {
  .cycles-grid { grid-template-columns: repeat(2, 1fr); }
  .nap-grid { grid-template-columns: 1fr 1fr; }
  .time-input { font-size: 2rem; }
}