:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --card2: #eef2ff;
  --text: #18223a;
  --muted: #69738a;
  --accent: #5b5ce2;
  --danger: #e24d68;
  --ok: #35ad83;
  --warn: #efa92d;
  --border: #e2e8f2;
}
:root[data-theme="dark"] {
  --bg: #101726;
  --card: #172033;
  --card2: #222e46;
  --text: #edf3ff;
  --muted: #a9b5ca;
  --accent: #817dff;
  --danger: #f26982;
  --ok: #59cda2;
  --warn: #f2ba4d;
  --border: #2d3b56;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at 10% -10%, #e0e7ff 0, transparent 32%), var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
:root[data-theme="dark"] body { background: radial-gradient(circle at 10% -10%, #26345e 0, transparent 35%), var(--bg); }
#app { max-width: 760px; margin: 0 auto; padding: 22px 16px 80px; }

.login-box { display:flex; flex-direction:column; gap:12px; margin-top: 40px; }
input, select, textarea, button {
  font-family: inherit; font-size: 15px; padding: 10px 12px;
  border-radius: 10px; border: 1px solid var(--border);
  background: var(--card); color: var(--text);
}
input, select, textarea { width: 100%; }
textarea { min-height: 60px; resize: vertical; }
button {
  background: var(--accent); color: white; border: none; cursor: pointer;
  font-weight: 600;
  box-shadow: 0 5px 12px rgba(91, 92, 226, .18);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
button:hover { transform: translateY(-1px); box-shadow: 0 8px 18px rgba(91, 92, 226, .23); }
button.secondary { background: var(--card2); color: var(--text); border: 1px solid var(--border); }
button.danger { background: var(--danger); }
button.small { padding: 6px 10px; font-size: 13px; }

.tabs { display:flex; gap:7px; margin: 16px 0; overflow-x:auto; padding-bottom: 2px; }
.tabs button { white-space:nowrap; }
.tabs button.inactive { background: rgba(255,255,255,.7); color: var(--muted); box-shadow: none; border: 1px solid var(--border); }
:root[data-theme="dark"] .tabs button.inactive { background: var(--card); }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 18px; padding: 16px; margin-bottom: 14px;
  box-shadow: 0 7px 20px rgba(35, 56, 97, .05);
}
.card h3 { margin: 0 0 6px 0; font-size: 17px; }
.muted { color: var(--muted); font-size: 13px; }
.row { display:flex; justify-content: space-between; align-items:center; gap:8px; }
.badge {
  display:inline-block; padding: 3px 8px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
}
.badge.now { background: var(--ok); color: #06210f; }
.badge.future { background: #eef2ff; color: #4f46c7; border:1px solid #dfe2ff; }
.badge.past { background: #f1f5f9; color: var(--muted); }
.badge.warn { background: var(--warn); color: #2b1c00; }
.badge.danger { background: var(--danger); color: white; }

.field-label { font-size: 12px; color: var(--muted); margin-bottom: 4px; display:block; }
.grid2 { display:grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.hero { color: white; border-radius: 24px; padding: 24px; background: linear-gradient(125deg, #4f46d8, #6d5de6 48%, #30b5a1); box-shadow: 0 14px 30px rgba(79, 70, 216, .24); }
.hero-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.hero-kicker, .eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: 11px; font-weight: 700; color: var(--muted); }
.hero-kicker { color: #dfe7ff; }
.theme-toggle { padding: 7px 10px; white-space: nowrap; background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .32); box-shadow: none; font-size: 12px; }
.theme-toggle:hover { background: rgba(255, 255, 255, .24); box-shadow: none; }
.hero h1 { font-size: 29px; line-height: 1.1; margin: 8px 0 6px; }
.hero p { margin: 0; color: #edf0ff; font-size: 14px; }
.calendar-nav { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; }
.calendar-title { text-align: center; display: grid; gap: 2px; }
.calendar-title strong { font-size: 17px; }
.week-strip { display: grid; grid-template-columns: repeat(7, 1fr); gap: 7px; margin: 0 0 14px; }
.day-chip { min-width: 0; padding: 10px 4px; display: grid; gap: 3px; justify-items: center; background: var(--card); color: var(--muted); box-shadow: 0 4px 10px rgba(35, 56, 97, .05); border: 1px solid var(--border); }
.day-chip strong { color: var(--text); font-size: 16px; }
.day-chip.selected { background: var(--accent); border-color: var(--accent); color: #dfe4ff; }
.day-chip.selected strong { color: white; }
.agenda-card { border-top: 4px solid #47b6a4; }
.agenda-heading { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 12px; }
.lesson-count { background: #e5faf5; color: #167b6a; border-radius: 999px; padding: 5px 9px; font-size: 12px; font-weight: 700; white-space: nowrap; }
:root[data-theme="dark"] .badge.future { background: #2b2d65; color: #d8d7ff; border-color: #3c4090; }
:root[data-theme="dark"] .badge.past { background: #253247; }
:root[data-theme="dark"] .lesson-count { background: #173d3b; color: #9de8d8; }
.agenda-item { display: grid; grid-template-columns: 88px 1fr; gap: 12px; padding: 13px 0; border-top: 1px solid var(--border); }
.agenda-time { color: var(--accent); font-weight: 750; font-size: 13px; }
.empty-agenda { padding: 22px 0 8px; color: var(--muted); text-align: center; }
.lesson-editor { display: grid; gap: 7px; padding: 13px 0 4px; }
.lesson-editor textarea { min-height: 74px; background: var(--card2); }
.lesson-editor button { justify-self: start; }
@media (max-width: 520px) {
  #app { padding: 14px 12px 64px; }
  .hero { padding: 21px; border-radius: 20px; }
  .hero-top { align-items: flex-start; }
  .hero h1 { font-size: 26px; }
  .calendar-nav { grid-template-columns: 1fr 1fr; }
  .calendar-title { grid-column: 1 / -1; grid-row: 1; }
  .calendar-nav button:last-child { grid-column: 2; grid-row: 2; }
  .calendar-nav button:first-child { grid-column: 1; grid-row: 2; }
  .agenda-item { grid-template-columns: 1fr; gap: 4px; }
}
hr { border: none; border-top: 1px solid var(--border); margin: 10px 0; }
.list-item { padding: 10px 0; border-bottom: 1px solid var(--border); }
.list-item:last-child { border-bottom: none; }
.cycle-details { display: grid; gap: 3px; min-width: 0; }
.cycle-period { color: var(--accent); font-size: 13px; font-weight: 700; }
.cycle-subject { font-size: 16px; font-weight: 700; }
.cycle-room { color: var(--text); font-size: 13px; }
.cycle-time { color: var(--muted); font-size: 13px; }
.cycle-lock { align-self: start; color: var(--muted); background: var(--card2); border: 1px solid var(--border); border-radius: 999px; padding: 5px 8px; font-size: 11px; font-weight: 700; white-space: nowrap; }
.schedule-actions { display: flex; align-items: center; gap: 7px; flex: 0 0 auto; }
.action-label { display: none; }
.schedule-composer { padding: 0; overflow: hidden; }
.composer-toggle { display: flex; width: 100%; align-items: center; justify-content: space-between; gap: 16px; padding: 16px; text-align: left; color: var(--text); background: transparent; box-shadow: none; }
.composer-toggle:hover { background: var(--card2); box-shadow: none; transform: none; }
.composer-copy { display: grid; gap: 3px; }
.composer-copy strong { font-size: 16px; }
.composer-copy span { color: var(--muted); font-size: 13px; font-weight: 400; }
.composer-chevron { display: grid; width: 30px; height: 30px; flex: 0 0 30px; place-items: center; border-radius: 50%; color: var(--accent); background: var(--card2); font-size: 21px; line-height: 1; transition: transform .28s ease, background .28s ease; }
.composer-toggle[aria-expanded="true"] .composer-chevron { transform: rotate(180deg); }
.composer-body { max-height: 0; overflow: hidden; opacity: 0; transition: max-height .38s ease, opacity .24s ease; }
.composer-body.is-open { max-height: 620px; opacity: 1; }
.composer-inner { padding: 0 16px 18px; }
.schedule-add-form { margin-top: 14px; }
@media (max-width: 520px) {
  .list-item > .row { display: block; }
  .cycle-lock { display: inline-block; margin-top: 12px; }
  .schedule-actions { display: grid; grid-template-columns: 1fr 1fr; width: 100%; margin-top: 14px; }
  .schedule-actions button { min-height: 44px; display: flex; align-items: center; justify-content: center; gap: 7px; }
  .action-label { display: inline; }
}