:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-soft: #edf1f5;
  --text: #18212b;
  --muted: #687684;
  --border: #d8e0e7;
  --primary: #2877e0;
  --primary-soft: #e8f1fd;
  --success: #16895a;
  --success-soft: #e7f5ee;
  --danger: #c43d55;
  --danger-soft: #fcebef;
  --warning: #9a6800;
  --warning-soft: #fff4d8;
  --shadow: 0 8px 28px rgba(24, 33, 43, .09);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1722;
  --surface: #172231;
  --surface-soft: #202e3e;
  --text: #f3f6f9;
  --muted: #aab6c2;
  --border: #334459;
  --primary: #63a7ff;
  --primary-soft: #1b3658;
  --success: #58d19a;
  --success-soft: #173b31;
  --danger: #ff7890;
  --danger-soft: #462532;
  --warning: #ffd268;
  --warning-soft: #483b1f;
  --shadow: 0 10px 30px rgba(0, 0, 0, .24);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}
button, input, select { font: inherit; letter-spacing: 0; }
button { -webkit-tap-highlight-color: transparent; }

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(14px);
}
.header-inner {
  width: min(100%, 900px);
  min-height: 58px;
  margin: 0 auto;
  padding: max(8px, env(safe-area-inset-top)) 14px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand img { flex: 0 0 auto; border-radius: 7px; }
.brand strong, .brand span { display: block; }
.brand strong { font-size: 17px; line-height: 20px; }
.brand span { color: var(--muted); font-size: 12px; line-height: 16px; }

.app-main {
  width: min(100%, 900px);
  min-height: calc(100vh - 132px);
  margin: 0 auto;
  padding: 16px 14px calc(92px + env(safe-area-inset-bottom));
}
.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.page-head h1 { margin: 0; font-size: 22px; line-height: 28px; }
.page-head p { margin: 3px 0 0; color: var(--muted); font-size: 13px; }
.section-title { margin: 22px 0 9px; font-size: 15px; line-height: 20px; }
.section-title:first-child { margin-top: 0; }

.quick-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.quick-button {
  min-height: 74px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  text-align: left;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
}
.quick-button:active { background: var(--surface-soft); }
.quick-button svg { width: 24px; height: 24px; color: var(--primary); }
.quick-button strong, .quick-button span { display: block; overflow-wrap: anywhere; }
.quick-button strong { font-size: 14px; line-height: 18px; }
.quick-button span { margin-top: 2px; color: var(--muted); font-size: 12px; line-height: 15px; }
.quick-button.danger svg { color: var(--danger); }
.quick-button.warning svg { color: var(--warning); }

.list-panel { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--surface); }
.list-row {
  width: 100%;
  min-height: 58px;
  padding: 11px 12px;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
}
.list-row:last-child { border-bottom: 0; }
button.list-row:active { background: var(--surface-soft); }
.row-main { min-width: 0; flex: 1; }
.row-title, .row-meta { display: block; }
.row-title { font-weight: 700; font-size: 14px; line-height: 19px; overflow-wrap: anywhere; }
.row-meta { margin-top: 3px; color: var(--muted); font-size: 12px; line-height: 16px; overflow-wrap: anywhere; }
.row-side { flex: 0 0 auto; display: flex; align-items: center; gap: 7px; }
.row-side svg { width: 18px; height: 18px; color: var(--muted); }

.badge { display: inline-flex; align-items: center; min-height: 22px; padding: 2px 7px; border-radius: 999px; font-size: 11px; font-weight: 750; }
.badge.success { color: var(--success); background: var(--success-soft); }
.badge.danger { color: var(--danger); background: var(--danger-soft); }
.badge.warning { color: var(--warning); background: var(--warning-soft); }
.badge.info { color: var(--primary); background: var(--primary-soft); }

.toolbar { display: flex; flex-wrap: wrap; gap: 7px; margin: 10px 0 14px; }
.button, .icon-button {
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
}
.button { min-height: 38px; padding: 8px 11px; display: inline-flex; align-items: center; justify-content: center; gap: 7px; }
.button svg { width: 17px; height: 17px; }
.button.primary { border-color: var(--primary); background: var(--primary); color: #fff; }
.button.success { border-color: var(--success); color: var(--success); }
.button.danger { border-color: var(--danger); color: var(--danger); }
.button:disabled { opacity: .48; }
[data-write]:disabled { opacity: .48; cursor: not-allowed; }
.icon-button { width: 38px; height: 38px; padding: 0; display: inline-grid; place-items: center; }
.icon-button svg { width: 19px; height: 19px; }

.assignment-row { align-items: flex-start; }
.assignment-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 9px; }
.assignment-actions .button { min-height: 32px; padding: 5px 8px; font-size: 12px; }
.assignment-empty { border-left: 3px solid var(--warning); }
.assignment-locked { border-left: 3px solid var(--success); }

.date-strip { display: flex; gap: 7px; overflow-x: auto; padding: 2px 0 10px; scrollbar-width: none; }
.date-strip::-webkit-scrollbar { display: none; }
.date-chip { flex: 0 0 auto; min-width: 62px; min-height: 50px; padding: 6px 9px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); color: var(--text); text-align: center; }
.date-chip strong, .date-chip span { display: block; }
.date-chip strong { font-size: 14px; }
.date-chip span { margin-top: 3px; color: var(--muted); font-size: 11px; }
.date-chip.active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }

.search-box { width: 100%; min-height: 42px; padding: 9px 12px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); color: var(--text); }
.person-row.inactive { background: var(--danger-soft); }
.person-row.active { box-shadow: inset 3px 0 var(--success); }
.permission-list { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.permission-chip { min-height: 27px; padding: 4px 8px; border: 1px solid var(--danger); border-radius: 999px; background: transparent; color: var(--danger); font-size: 11px; font-weight: 750; }
.permission-chip.allowed { border-color: var(--success); background: var(--success-soft); color: var(--success); }

.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.field { min-width: 0; }
.field.full { grid-column: 1 / -1; }
.field label { display: block; margin-bottom: 5px; color: var(--muted); font-size: 12px; font-weight: 700; }
.field input, .field select { width: 100%; min-height: 42px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); color: var(--text); }
.empty-state { padding: 28px 16px; color: var(--muted); text-align: center; }

.bottom-nav {
  position: fixed;
  z-index: 30;
  left: 0;
  right: 0;
  bottom: 0;
  min-height: calc(68px + env(safe-area-inset-bottom));
  padding: 5px max(8px, env(safe-area-inset-left)) max(5px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-right));
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  backdrop-filter: blur(16px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.nav-button { min-width: 0; height: 54px; border: 0; background: transparent; color: var(--muted); display: grid; place-items: center; align-content: center; gap: 3px; }
.nav-button svg { width: 21px; height: 21px; }
.nav-button span { max-width: 100%; font-size: 10px; line-height: 13px; overflow-wrap: anywhere; }
.nav-button.active { color: var(--primary); }
.nav-button:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; border-radius: 7px; }

.action-dialog { width: min(calc(100% - 24px), 560px); max-height: min(84vh, 720px); padding: 0; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
.action-dialog::backdrop { background: rgba(8, 14, 22, .58); }
.dialog-head { position: sticky; top: 0; z-index: 2; min-height: 54px; padding: 8px 10px 8px 14px; border-bottom: 1px solid var(--border); background: var(--surface); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.dialog-head h2 { margin: 0; font-size: 17px; }
.dialog-body { padding: 12px; overflow-y: auto; }
.dialog-option { width: 100%; min-height: 46px; padding: 9px 10px; border: 0; border-bottom: 1px solid var(--border); background: var(--surface); color: var(--text); text-align: left; }
.dialog-option:last-child { border-bottom: 0; }

.loading-state { min-height: 55vh; display: grid; place-items: center; align-content: center; color: var(--muted); }
.spinner { width: 28px; height: 28px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.toast { position: fixed; z-index: 60; left: 50%; bottom: calc(78px + env(safe-area-inset-bottom)); transform: translate(-50%, 16px); width: min(calc(100% - 28px), 520px); padding: 11px 13px; border-radius: 7px; background: #18212b; color: #fff; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: .2s ease; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: #a92f46; }

@media (min-width: 700px) {
  .quick-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .app-main { padding-left: 20px; padding-right: 20px; }
  .bottom-nav { left: 50%; right: auto; width: min(100%, 900px); transform: translateX(-50%); border-left: 1px solid var(--border); border-right: 1px solid var(--border); }
}

@media (max-width: 360px) {
  .quick-button { grid-template-columns: 24px minmax(0, 1fr); padding: 9px; }
  .quick-button svg { width: 20px; height: 20px; }
  .button { padding-left: 8px; padding-right: 8px; }
  .form-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
}