:root {
  --text: #172033;
  --muted: #687184;
  --line: rgba(255, 255, 255, 0.48);
  --glass: rgba(255, 255, 255, 0.58);
  --glass-strong: rgba(255, 255, 255, 0.76);
  --accent: #0a84ff;
  --accent-2: #34c759;
  --warn: #ff9f0a;
  --danger: #ff3b30;
  --shadow: 0 18px 55px rgba(47, 73, 120, 0.18);
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 10% 10%, rgba(10,132,255,.22), transparent 32rem),
    radial-gradient(circle at 86% 16%, rgba(52,199,89,.20), transparent 28rem),
    linear-gradient(140deg, #edf5ff 0%, #f8fbff 44%, #eef6f1 100%);
}

a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
input, select, textarea, button { min-width: 0; }

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  backdrop-filter: saturate(1.1);
}

.shell {
  width: min(1180px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px 18px 98px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 18px;
}

.glass {
  background: var(--glass);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px) saturate(1.35);
  -webkit-backdrop-filter: blur(24px) saturate(1.35);
}

.sidebar {
  position: sticky;
  top: 18px;
  height: calc(100vh - 36px);
  border-radius: 28px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: white;
  background: linear-gradient(145deg, var(--accent), #5ac8fa);
}

.nav { display: grid; gap: 8px; }
.nav a, .bottom-nav a {
  padding: 12px 14px;
  border-radius: 16px;
  color: var(--muted);
  font-weight: 700;
}

.nav a.active, .bottom-nav a.active {
  color: var(--text);
  background: rgba(255,255,255,.74);
}

.sidebar form { margin-top: auto; }
.main { min-width: 0; }

.hero {
  min-height: 150px;
  padding: 26px 4px 22px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.hero.compact { min-height: 92px; }
.hero h1 {
  margin: 0;
  max-width: 720px;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.02;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.muted, small { color: var(--muted); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }

.button, .ghost {
  border: 0;
  min-height: 44px;
  padding: 12px 16px;
  border-radius: 16px;
  cursor: pointer;
  font-weight: 800;
}

.button {
  color: white;
  background: linear-gradient(145deg, var(--accent), #39a7ff);
  box-shadow: 0 10px 26px rgba(10,132,255,.26);
}

.ghost {
  color: var(--text);
  background: rgba(255,255,255,.68);
  border: 1px solid rgba(255,255,255,.7);
}

.full { width: 100%; }

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}

.metric {
  padding: 16px;
  border-radius: 24px;
}

.metric span { display: block; color: var(--muted); font-weight: 700; }
.metric strong { display: block; margin-top: 8px; font-size: 30px; letter-spacing: 0; }
.metric.warn strong { color: var(--warn); }
.metric.danger strong, .danger { color: var(--danger); }

.panel, .auth-card, .search, .filters {
  border-radius: 28px;
  padding: 18px;
  margin-bottom: 14px;
}

.calendar-panel {
  border-radius: 28px;
  padding: 18px;
  margin-bottom: 14px;
}

.calendar-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  text-align: center;
}

.calendar-head h2 {
  margin: 0;
  font-size: 26px;
}

.calendar-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font-weight: 800;
}

.calendar-weekdays,
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
}

.calendar-weekdays {
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 900;
  text-align: center;
}

.calendar-day {
  min-height: 122px;
  padding: 10px;
  border-radius: 18px;
  background: rgba(255,255,255,.46);
  border: 1px solid rgba(255,255,255,.56);
  overflow: hidden;
}

.calendar-day.outside {
  opacity: .38;
}

.calendar-day.today {
  border-color: rgba(10,132,255,.55);
  box-shadow: inset 0 0 0 1px rgba(10,132,255,.28);
}

.calendar-day.has-lessons {
  background: rgba(255,255,255,.72);
}

.day-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 8px;
  font-weight: 900;
}

.day-top b {
  color: var(--accent);
  font-size: 12px;
}

.day-lessons {
  display: grid;
  gap: 5px;
}

.lesson-chip,
.lesson-more {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 5px 7px;
  border-radius: 10px;
  background: rgba(10,132,255,.10);
  color: #0b5cad;
  font-size: 12px;
  font-weight: 800;
}

.lesson-more {
  background: rgba(52,199,89,.13);
  color: #1b7c39;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-head h2, .panel h2 { margin: 0; font-size: 20px; }
.panel-head a { color: var(--accent); font-weight: 800; }

.grid-two {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
}

.stack { display: grid; gap: 10px; }

.row, .lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px;
  border-radius: 18px;
  background: rgba(255,255,255,.52);
}

.row span, .lesson-row div { min-width: 0; }
.row small, .lesson-row small { display: block; margin-top: 4px; }
.lesson-row p { margin: 6px 0 0; color: var(--muted); }

.status, .pill {
  flex: 0 0 auto;
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  background: rgba(255,255,255,.72);
}

.status.ok { color: var(--accent-2); }
.status.warn { color: var(--warn); }
.status.bad { color: var(--danger); }

.student-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 14px;
}

.student-card {
  border-radius: 28px;
  padding: 18px;
}

.card-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.card-top h2 { margin: 0; }
.card-top p { margin: 6px 0 0; color: var(--muted); }

.mini-metrics {
  display: flex;
  gap: 10px;
  margin: 18px 0 10px;
}

.mini-metrics span {
  flex: 1;
  padding: 10px;
  border-radius: 16px;
  background: rgba(255,255,255,.55);
}

.search, .filters {
  display: flex;
  gap: 10px;
  align-items: center;
}

.search > *, .filters > * {
  min-width: 0;
}

.filters input,
.filters select {
  flex: 1 1 0;
}

.form { display: grid; gap: 14px; }
.grid-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.wide { grid-column: 1 / -1; }

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-weight: 800;
}

input, select, textarea {
  display: block;
  width: 100%;
  max-width: 100%;
  border: 1px solid rgba(255,255,255,.74);
  border-radius: 16px;
  padding: 12px 13px;
  color: var(--text);
  background: rgba(255,255,255,.66);
  outline: none;
}

textarea { resize: vertical; }

input[type="date"],
input[type="month"],
input[type="time"] {
  -webkit-appearance: none;
  appearance: none;
}

input:focus, select:focus, textarea:focus {
  border-color: rgba(10,132,255,.55);
  box-shadow: 0 0 0 4px rgba(10,132,255,.12);
}

.auth-card {
  width: min(430px, 100%);
  margin: 12vh auto 0;
}

.auth-card h1 { margin: 0 0 10px; font-size: 42px; letter-spacing: 0; }

.toasts {
  position: sticky;
  top: 12px;
  z-index: 5;
  display: grid;
  gap: 8px;
  margin-bottom: 8px;
}

.toast {
  padding: 12px 14px;
  border-radius: 16px;
  background: var(--glass-strong);
  border: 1px solid var(--line);
  font-weight: 700;
  backdrop-filter: blur(18px);
}

.toast.error { color: var(--danger); }
.toast.success { color: #178c3d; }

.danger-link {
  margin-top: 14px;
  border: 0;
  background: transparent;
  color: var(--danger);
  font-weight: 800;
  cursor: pointer;
}

.empty {
  margin: 0;
  color: var(--muted);
  padding: 16px;
}

.bottom-nav { display: none; }

@media (max-width: 860px) {
  .shell {
    display: block;
    padding: 10px 12px 94px;
  }

  .sidebar { display: none; }

  .hero {
    align-items: flex-start;
    flex-direction: column;
    min-height: 132px;
    padding-top: 20px;
  }

  .hero h1 { font-size: 42px; }

  .metrics, .student-grid, .grid-two {
    grid-template-columns: 1fr 1fr;
  }

  .grid-two { display: grid; }

  .actions, .hero .button, .hero .ghost { width: 100%; }
  .actions .button, .actions .ghost { flex: 1; text-align: center; }

  .bottom-nav {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: max(10px, env(safe-area-inset-bottom));
    z-index: 10;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
    padding: 8px;
    border-radius: 24px;
  }

  .bottom-nav a {
    display: grid;
    place-items: center;
    min-height: 44px;
    padding: 8px 6px;
    font-size: 13px;
  }

  .bottom-nav .primary-tab {
    border-radius: 16px;
  }

  .bottom-nav .active {
    color: white;
    background: var(--accent);
  }
}

@media (max-width: 620px) {
  .metrics, .student-grid, .grid-form, .grid-two {
    grid-template-columns: 1fr;
  }

  .search, .filters {
    flex-direction: column;
    align-items: stretch;
  }

  .filters input,
  .filters select,
  .filters button,
  .search input,
  .search button {
    width: 100%;
    max-width: 100%;
    flex-basis: auto;
  }

  .row, .lesson-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .calendar-panel {
    padding: 12px;
  }

  .calendar-head {
    grid-template-columns: 1fr auto 1fr;
    gap: 8px;
  }

  .calendar-head .ghost {
    min-height: 38px;
    padding: 8px 10px;
    border-radius: 12px;
  }

  .calendar-head h2 {
    font-size: 22px;
  }

  .calendar-head p {
    font-size: 13px;
  }

  .calendar-weekdays,
  .calendar-grid {
    gap: 4px;
  }

  .calendar-day {
    min-height: 76px;
    padding: 6px;
    border-radius: 12px;
  }

  .day-top {
    margin-bottom: 5px;
    font-size: 13px;
  }

  .day-top b {
    font-size: 10px;
  }

  .lesson-chip,
  .lesson-more {
    padding: 4px 5px;
    border-radius: 8px;
    font-size: 10px;
  }

  .metric strong { font-size: 28px; }
  .hero h1 { font-size: 36px; }
}