:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #172033;
  background: #f5f7fb;
  --border: #d8deea;
  --surface: #ffffff;
  --primary: #1f5eff;
  --primary-dark: #1648c7;
  --muted: #667085;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: #f5f7fb; }
a { color: #174fc4; }
button, input, select, textarea { font: inherit; }
button, .button-link { min-height: 44px; }
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px max(16px, env(safe-area-inset-left)); background: rgba(255,255,255,.96); border-bottom: 1px solid var(--border); backdrop-filter: blur(8px); }
.brand { color: #172033; font-weight: 800; text-decoration: none; font-size: 1.15rem; }
.topbar nav { display: flex; gap: 12px; align-items: center; font-size: .9rem; }
.inline-form { display: inline; margin: 0; }
.link-button { border: 0; background: transparent; color: #174fc4; padding: 0; min-height: auto; cursor: pointer; }
.container { max-width: 1100px; margin: 0 auto; padding: 18px 14px calc(110px + env(safe-area-inset-bottom)); }
h1 { margin: 0 0 8px; font-size: clamp(1.35rem, 4vw, 2rem); }
p { color: var(--muted); }
.week-head, .page-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 14px; }
.week-nav { display: flex; align-items: center; gap: 8px; }
.week-nav input { min-height: 44px; border: 1px solid var(--border); border-radius: 10px; padding: 0 8px; background: white; }
.icon-btn { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--border); border-radius: 12px; background: white; text-decoration: none; font-size: 1.25rem; }
.quick-links { display: flex; gap: 10px; flex-wrap: wrap; font-size: .9rem; }
.summary-card, .day-card, .history-card, .admin-card, .admin-add, .login-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; box-shadow: 0 2px 9px rgba(20,34,66,.05); }
.summary-card { padding: 12px 14px; margin-bottom: 14px; }
.summary-row { display: flex; justify-content: space-between; gap: 10px; font-size: .95rem; }
progress { width: 100%; height: 12px; margin-top: 8px; accent-color: var(--primary); }
.days-grid { display: grid; grid-template-columns: repeat(7, minmax(0,1fr)); gap: 10px; }
.day-card { padding: 12px; min-width: 0; }
.day-card > header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.weekday { display: block; font-weight: 800; }
.date { display: block; color: var(--muted); font-size: .85rem; margin-top: 2px; }
.day-status { color: #16803d; font-weight: 900; }
.button-group { display: grid; gap: 7px; }
.shift-buttons { grid-template-columns: repeat(2, minmax(0,1fr)); }
.post-buttons { grid-template-columns: 1fr; }
.choice { border: 1px solid var(--border); border-radius: 11px; background: #fff; padding: 8px 5px; cursor: pointer; font-weight: 650; color: #243149; }
.choice:hover { border-color: #91a7d8; }
.choice.selected { background: #eaf0ff; border-color: #4c73db; color: #173f9e; box-shadow: inset 0 0 0 1px #4c73db; }
.post-label { margin: 11px 0 6px; color: var(--muted); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .03em; }
.day-detail { margin-top: 11px; padding-top: 10px; border-top: 1px solid #eef1f6; min-height: 58px; font-size: .84rem; }
.day-detail strong, .day-detail .muted { display: block; }
.period-list { display: grid; gap: 2px; margin: 5px 0; font-size: .78rem; }
.muted { color: var(--muted); }
.sticky-actions { position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; display: flex; justify-content: center; align-items: center; gap: 9px; flex-wrap: wrap; padding: 10px 14px calc(10px + env(safe-area-inset-bottom)); background: rgba(255,255,255,.96); border-top: 1px solid var(--border); backdrop-filter: blur(10px); }
.sticky-actions form { margin: 0; }
#save-message { flex-basis: 100%; text-align: center; min-height: 18px; font-size: .85rem; color: var(--muted); }
.primary, .secondary, .button-link { border-radius: 11px; padding: 10px 15px; font-weight: 750; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.primary { border: 1px solid var(--primary); background: var(--primary); color: white; }
.primary:hover { background: var(--primary-dark); }
.secondary { border: 1px solid var(--border); background: white; color: #243149; }
.full { width: 100%; }
.flash { padding: 10px 12px; border-radius: 10px; margin-bottom: 12px; }
.flash.error { background: #fff1f0; border: 1px solid #ffc9c4; }
.flash.success { background: #edf9f0; border: 1px solid #b9e3c3; }
.login-card { max-width: 380px; margin: 10vh auto 0; padding: 24px; }
.login-card form, .admin-form { display: grid; gap: 12px; }
label { display: grid; gap: 5px; font-weight: 650; }
input, select, textarea { width: 100%; border: 1px solid var(--border); border-radius: 10px; padding: 10px; background: white; }
textarea { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; }
.history-list, .admin-list { display: grid; gap: 10px; }
.history-card { display: flex; justify-content: space-between; gap: 16px; align-items: center; padding: 14px; }
.history-card span { display: block; color: var(--muted); margin-top: 4px; }
.row-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.row-actions form { margin: 0; }
.admin-add, .admin-card { padding: 12px 14px; margin-bottom: 10px; }
.admin-add summary, .admin-card summary { min-height: 44px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.admin-card summary span { color: var(--muted); font-size: .85rem; }
.admin-form { margin: 14px 0; }
small { color: var(--muted); font-weight: 400; }
@media (max-width: 900px) { .days-grid { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 620px) {
  .container { padding-left: 10px; padding-right: 10px; }
  .topbar { align-items: flex-start; }
  .topbar nav { gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
  .week-head, .page-head, .history-card { align-items: stretch; flex-direction: column; }
  .week-nav { display: grid; grid-template-columns: 44px 1fr 44px; }
  .days-grid { grid-template-columns: 1fr; }
  .day-card { padding: 14px; }
  .shift-buttons { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .post-buttons { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .choice { min-height: 48px; }
}
@media (max-width: 390px) {
  .shift-buttons { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .topbar nav a:nth-child(2) { display: none; }
}