/* ==========================================================================
   ДНЕВНИК / ЖУРНАЛ ПОСЕЩАЕМОСТИ
   Единый современный минималистичный CSS со специальной мобильной версией
   ========================================================================== */

:root {
  /* Тёмная тема (Dark mode по умолчанию) */
  --bg: #0f1117;
  --surface: #181b24;
  --surface-hover: #222634;
  --surface-active: #2b3042;
  --border: #282d3d;
  --border-light: #373e54;
  --text: #f0f2f8;
  --text-secondary: #9aa1b6;
  --muted: #6b7280;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-subtle: rgba(79, 70, 229, 0.12);
  --primary-border: rgba(79, 70, 229, 0.35);

  --danger: #ef4444;
  --danger-subtle: rgba(239, 68, 68, 0.12);
  --success: #10b981;
  --success-subtle: rgba(16, 185, 129, 0.12);
  --warning: #f59e0b;
  --warning-subtle: rgba(245, 158, 11, 0.12);
  --purple: #8b5cf6;
  --purple-subtle: rgba(139, 92, 246, 0.12);
  --blue: #3b82f6;
  --blue-subtle: rgba(59, 130, 246, 0.12);

  /* Цвета ячеек посещаемости и оценок */
  --cell-empty: #1c202b;
  --cell-empty-text: #50576f;
  --cell-5-bg: #064e3b;
  --cell-5-text: #34d399;
  --cell-4-bg: #1e3a8a;
  --cell-4-text: #60a5fa;
  --cell-3-bg: #78350f;
  --cell-3-text: #fbbf24;
  --cell-2-bg: #7f1d1d;
  --cell-2-text: #f87171;
  --cell-p-bg: rgba(16, 185, 129, 0.18);
  --cell-p-text: #34d399;
  --cell-a-bg: rgba(239, 68, 68, 0.18);
  --cell-a-text: #f87171;
  --cell-l-bg: rgba(245, 158, 11, 0.18);
  --cell-l-text: #fbbf24;
  --cell-e-bg: rgba(139, 92, 246, 0.18);
  --cell-e-text: #c084fc;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-sticky: 4px 0 10px rgba(0, 0, 0, 0.35);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
}

body.light {
  /* Светлая тема */
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --surface-active: #e2e8f0;
  --border: #e2e8f0;
  --border-light: #cbd5e1;
  --text: #0f172a;
  --text-secondary: #475569;
  --muted: #94a3b8;

  --primary: #4338ca;
  --primary-hover: #3730a3;
  --primary-subtle: rgba(67, 56, 202, 0.08);
  --primary-border: rgba(67, 56, 202, 0.25);

  --danger: #dc2626;
  --danger-subtle: #fef2f2;
  --success: #059669;
  --success-subtle: #ecfdf5;
  --warning: #d97706;
  --warning-subtle: #fffbeb;
  --purple: #7c3aed;
  --purple-subtle: #f5f3ff;
  --blue: #2563eb;
  --blue-subtle: #eff6ff;

  --cell-empty: #f1f5f9;
  --cell-empty-text: #94a3b8;
  --cell-5-bg: #dcfce7;
  --cell-5-text: #15803d;
  --cell-4-bg: #dbeafe;
  --cell-4-text: #1d4ed8;
  --cell-3-bg: #fef3c7;
  --cell-3-text: #b45309;
  --cell-2-bg: #fee2e2;
  --cell-2-text: #b91c1c;
  --cell-p-bg: #dcfce7;
  --cell-p-text: #15803d;
  --cell-a-bg: #fee2e2;
  --cell-a-text: #b91c1c;
  --cell-l-bg: #fef3c7;
  --cell-l-text: #b45309;
  --cell-e-bg: #ede9fe;
  --cell-e-text: #6d28d9;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.12);
  --shadow-sticky: 4px 0 8px rgba(0, 0, 0, 0.06);
}

/* ==========================================================================
   Базовые стили
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ==========================================================================
   Шапка (Appbar)
   ========================================================================== */
.appbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  height: 58px;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.appbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

/* Кнопка «Назад» в шапке */
.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 500;
  padding: 0.38rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--surface-hover);
  border: 1px solid var(--border);
  white-space: nowrap;
  transition: all 0.15s ease;
}

.btn-back:hover {
  background: var(--surface-active);
  border-color: var(--border-light);
  color: var(--primary);
}

.btn-back-icon {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  transition: transform 0.15s ease;
}

.btn-back:hover .btn-back-icon {
  transform: translateX(-2px);
}
  

.appbar-title {
  font-size: 1.1rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-decoration: none;
  color: var(--text);
}

.appbar-sub {
  font-size: 0.76rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Правая часть шапки: строго в один ряд без переноса */
.appbar-right,
.appbar-actions {
  display: flex !important;
  flex-direction: row !important;
  flex-wrap: nowrap !important;
  align-items: center !important;
  gap: 0.75rem;
  flex-shrink: 0;
}

.user-name {
  color: var(--text-secondary);
  font-size: 0.86rem;
}

/* Кнопка смены темы */
.btn-theme {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  background: var(--surface);
  color: var(--text);
  flex-shrink: 0;
  transition: background-color 0.15s;
}

.btn-theme:hover {
  background: var(--surface-hover);
} 

.btn-login {
  padding: 0.45rem 1.15rem;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background-color 0.15s;
}

.btn-login:hover {
  background: var(--primary-hover);
}

.btn-logout {
  padding: 0.35rem 0.85rem;
  background: var(--danger-subtle);
  color: var(--danger);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-logout:hover {
  border-color: var(--danger);
}

/* ==========================================================================
   Основной контейнер
   ========================================================================== */
.content {
  flex: 1;
  padding: 1.5rem;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
}

.loading {
  text-align: center;
  color: var(--text-secondary);
  padding: 3rem 1rem;
  font-size: 0.95rem;
}

/* ==========================================================================
   Панель добавления пары (Add Lesson Bar)
   ========================================================================== */
.add-bar {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  flex-wrap: wrap;
}

.add-bar input[type="date"],
.add-bar select,
.add-bar input[type="text"] {
  height: 38px;
  padding: 0 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.15s;
}

.add-bar input[type="date"]:focus,
.add-bar select:focus,
.add-bar input[type="text"]:focus {
  border-color: var(--primary);
}

.add-bar input[type="date"] {
  min-width: 140px;
}

.add-bar select {
  min-width: 150px;
}

.add-bar input[type="text"] {
  min-width: 90px;
}

.btn-add {
  height: 38px;
  padding: 0 1.15rem;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s;
}

.btn-add:hover {
  background: var(--primary-hover);
}

/* ==========================================================================
   ТАБЛИЦА ПОСЕЩАЕМОСТИ (ATTENDANCE GRID)
   ========================================================================== */
.grid-wrap {
  position: relative;
  overflow-x: auto;
  overflow-y: visible;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overscroll-behavior-x: contain;
}

/* Полоса прокрутки */
.grid-wrap::-webkit-scrollbar {
  height: 6px;
  width: 6px;
}
.grid-wrap::-webkit-scrollbar-track {
  background: var(--bg);
}
.grid-wrap::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

/* Отдельные границы ячеек для безупречной работы sticky в iOS / WebKit */
table {
  border-collapse: separate;
  border-spacing: 0;
  min-width: 100%;
  width: max-content;
}

th, td {
  padding: 0.45rem 0.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr:last-child td {
  border-bottom: none;
}

/* --- THEAD --- */
thead th {
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 0.76rem;
  position: sticky;
  top: 0;
  z-index: 10;
  font-weight: 600;
  user-select: none;
}

/* Левая верхняя ячейка (пересечение заголовков) */
thead th.name-col {
  text-align: left;
  width: 190px;
  min-width: 190px;
  max-width: 210px;
  position: sticky;
  left: 0;
  z-index: 25; /* Приоритет над обычными th и над td.name-col */
  background: var(--surface);
  box-shadow: var(--shadow-sticky);
  padding-left: 0.85rem;
}

/* Колонка с датой урока */
thead th.date-col {
  cursor: pointer;
  min-width: 74px;
  padding: 0.5rem 0.45rem;
  transition: background-color 0.15s;
}

thead th.date-col:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.date-head-day {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text);
}

.date-head-time {
  font-size: 0.68rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.date-head-topic {
  font-size: 0.65rem;
  color: var(--success);
  margin-top: 2px;
  max-width: 74px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.hw-dot, .top-dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  margin-left: 3px;
  vertical-align: middle;
}
.hw-dot { background: var(--primary); }
.top-dot { background: var(--success); }

/* --- TBODY --- */
tbody tr {
  transition: background-color 0.1s ease;
}

tbody tr:hover {
  background-color: var(--surface-hover);
}

/* Фиксированная колонка с ФИО студента */
td.name-col {
  text-align: left;
  background: var(--surface);
  position: sticky;
  left: 0;
  z-index: 15;
  width: 190px;
  min-width: 190px;
  max-width: 210px;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-sticky);
  padding: 0.45rem 0.85rem;
  overflow: hidden;
  text-overflow: ellipsis;
}

tbody tr:hover td.name-col {
  background: var(--surface-hover);
}

.student-name-text {
  display: inline-block;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  vertical-align: middle;
}

.comment-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--purple);
  margin-left: 5px;
  vertical-align: middle;
}

/* --- Клетка статуса (.cell) --- */
.cell {
  width: 44px;
  height: 34px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 600;
  margin: auto;
  user-select: none;
  transition: transform 0.1s ease, filter 0.1s ease;
}

.cell:hover {
  filter: brightness(1.1);
  transform: scale(1.05);
}

.cell:active {
  transform: scale(0.92);
}

.cell.empty   { background: var(--cell-empty); color: var(--cell-empty-text); font-weight: normal; }
.cell.grade-5 { background: var(--cell-5-bg); color: var(--cell-5-text); }
.cell.grade-4 { background: var(--cell-4-bg); color: var(--cell-4-text); }
.cell.grade-3 { background: var(--cell-3-bg); color: var(--cell-3-text); }
.cell.grade-2 { background: var(--cell-2-bg); color: var(--cell-2-text); }
.cell.present { background: var(--cell-p-bg); color: var(--cell-p-text); }
.cell.absent  { background: var(--cell-a-bg); color: var(--cell-a-text); }
.cell.late    { background: var(--cell-l-bg); color: var(--cell-l-text); }
.cell.excused { background: var(--cell-e-bg); color: var(--cell-e-text); }

/* Секция гостей */
.guests-section {
  margin-top: 1.5rem;
}

.guests-title {
  font-size: 0.75rem;
  color: var(--purple);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.guests-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ==========================================================================
   Всплывающие окна (Popup)
   ========================================================================== */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 100;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(2px);
  padding: 1rem;
}

.overlay.open {
  display: flex;
}

.popup {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow-lg);
  animation: popIn 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.96) translateY(6px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.popup h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.popup .sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.status-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.status-btn {
  padding: 0.65rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--bg);
  color: var(--text);
  transition: all 0.12s;
  text-align: center;
}

.status-btn:hover {
  background: var(--surface-hover);
  border-color: var(--primary);
}

.status-btn.active {
  border-color: var(--primary);
  background: var(--primary-subtle);
  outline: 2px solid var(--primary);
}

.s5 { color: var(--success); }
.s4 { color: var(--blue); }
.s3 { color: var(--warning); }
.s2 { color: var(--danger); }
.sp { color: var(--success); }
.sa { color: var(--danger); }
.sl { color: var(--warning); }
.se { color: var(--purple); }

.field {
  margin-bottom: 0.9rem;
}

.field label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
  font-weight: 500;
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.15s;
}

.field input:focus,
.field textarea:focus {
  border-color: var(--primary);
}

.popup-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.btn-save {
  flex: 1;
  padding: 0.65rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s;
}

.btn-save:hover {
  background: var(--primary-hover);
}

.btn-cancel {
  padding: 0.65rem 0.9rem;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
}

.btn-cancel:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.btn-danger {
  padding: 0.65rem 0.85rem;
  background: var(--danger-subtle);
  color: var(--danger);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-danger:hover {
  border-color: var(--danger);
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.8rem 0;
}

/* ==========================================================================
   Стили Dashboard (Главная)
   ========================================================================== */
.welcome {
  margin-bottom: 1.8rem;
}
.welcome h1 {
  font-size: 1.5rem;
  font-weight: 600;
}
.welcome p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 0.2rem;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  cursor: pointer;
  transition: border-color 0.18s, box-shadow 0.18s, transform 0.18s;
  box-shadow: var(--shadow-sm);
}
.card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.card-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: var(--primary-subtle);
  border-radius: var(--radius-sm);
}
.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.card-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Стили Groups (Группы)
   ========================================================================== */
.groups-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.group-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.group-card:hover {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-sm);
}
.group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.12s;
}
.group-header:hover {
  background: var(--surface-hover);
}
.group-header-left h2 {
  font-size: 1rem;
  font-weight: 600;
}
.group-header-left .meta {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}
.chevron {
  color: var(--text-secondary);
  font-size: 0.8rem;
  transition: transform 0.2s;
  display: inline-block;
}
.chevron.open {
  transform: rotate(180deg);
}
.group-body {
  display: none;
  border-top: 1px solid var(--border);
}
.group-body.open {
  display: block;
}
.students-section {
  padding: 0.9rem 1.25rem;
}
.section-title {
  font-size: 0.74rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.student-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: background-color 0.12s;
}
.student-row:hover {
  background: var(--surface-hover);
}
.student-name {
  font-size: 0.88rem;
}
.btn-remove {
  background: transparent;
  color: var(--danger);
  border: none;
  cursor: pointer;
  font-size: 0.76rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  opacity: 0.6;
  transition: opacity 0.12s, background-color 0.12s;
}
.student-row:hover .btn-remove {
  opacity: 1;
}
.btn-remove:hover {
  background: var(--danger-subtle);
}
.add-student-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border);
}
.add-student-row input {
  flex: 1;
  padding: 0.45rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.86rem;
  outline: none;
}
.add-student-row input:focus {
  border-color: var(--primary);
}
.subgroups-section {
  padding: 0.75rem 1.25rem 0.9rem;
  border-top: 1px solid var(--border);
}
.subgroup-item {
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  overflow: hidden;
  border: 1px solid var(--border);
}
.subgroup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.85rem;
}
.subgroup-header:hover {
  background: var(--surface-hover);
}
.subgroup-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  flex: 1;
}
.subgroup-name {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--purple);
}
.subgroup-count {
  font-size: 0.75rem;
  color: var(--text-secondary);
}
.subgroup-body {
  display: none;
  padding: 0.25rem 0.85rem 0.65rem;
}
.subgroup-body.open {
  display: block;
}
.subgroup-student-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.3rem 0.4rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.btn-remove-sg {
  background: transparent;
  color: var(--danger);
  border: none;
  cursor: pointer;
  font-size: 0.74rem;
  opacity: 0.6;
}
.subgroup-student-row:hover .btn-remove-sg {
  opacity: 1;
}
.add-sg-student-row {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.4rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--border);
}
.add-sg-student-row select {
  flex: 1;
  padding: 0.4rem 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.82rem;
}
.btn-add-sg {
  padding: 0.4rem 0.75rem;
  background: var(--purple-subtle);
  color: var(--purple);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
}
.lessons-section {
  padding: 0.75rem 1.25rem 0.9rem;
  border-top: 1px solid var(--border);
}
.lessons-toggle-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}
.lessons-list {
  display: none;
  flex-direction: column;
  gap: 0.4rem;
}
.lessons-list.open {
  display: flex;
}
.lesson-item {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border);
}
.lesson-item-name {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--blue);
}
.lesson-item-meta {
  font-size: 0.74rem;
  color: var(--text-secondary);
}
.lesson-item-sub {
  font-size: 0.7rem;
  color: var(--purple);
  background: var(--purple-subtle);
  padding: 2px 7px;
  border-radius: 12px;
  display: inline-block;
  margin-left: 0.35rem;
}
.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  padding: 0.3rem 0.65rem;
  font-size: 0.78rem;
  cursor: pointer;
}

/* ==========================================================================
   Стили Lessons (Предметы)
   ========================================================================== */
.lesson-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.lesson-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.lesson-card:hover {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-sm);
}
.lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  cursor: pointer;
}
.lesson-row:hover {
  background: var(--surface-hover);
}
.lesson-name {
  font-size: 1rem;
  font-weight: 600;
}
.lesson-meta {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.35rem;
  flex-wrap: wrap;
}
.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.74rem;
  background: var(--bg);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.tag.subgroup {
  background: var(--purple-subtle);
  color: var(--purple);
  border-color: transparent;
}
.tag.teacher {
  background: var(--success-subtle);
  color: var(--success);
  border-color: transparent;
}
.btn-goto {
  padding: 0.35rem 0.85rem;
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid var(--primary-border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
}
.empty {
  text-align: center;
  color: var(--text-secondary);
  margin-top: 2rem;
  font-size: 0.9rem;
}

/* ==========================================================================
   Стили Login & Hero (Авторизация и Приветствие)
   ========================================================================== */
.hero {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  position: relative;
}
.hero-content {
  max-width: 580px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  font-weight: 600;
  line-height: 1.4;
}
.hero h1 span {
  color: var(--primary);
}
.hero p {
  margin-top: 0.8rem;
  color: var(--text-secondary);
  font-size: 1rem;
}
.btn-login {
  padding: 0.45rem 1.15rem;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-block;
}
.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow-md);
}
.login-card h2 {
  font-size: 1.35rem;
  margin-bottom: 1.5rem;
  text-align: center;
  font-weight: 600;
}
.error {
  color: var(--danger);
  font-size: 0.82rem;
  margin-bottom: 0.9rem;
  text-align: center;
  display: none;
  padding: 0.45rem;
  background: var(--danger-subtle);
  border-radius: var(--radius-sm);
}
.btn-submit {
  width: 100%;
  padding: 0.75rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  margin-top: 0.5rem;
  transition: background-color 0.15s;
}
.btn-submit:hover {
  background: var(--primary-hover);
}

/* ==========================================================================
   АДАПТАЦИЯ ПОД МОБИЛЬНЫЕ УСТРОЙСТВА (@media max-width: 680px)
   Специальная верстка для смартфонов
   ========================================================================== */
@media (max-width: 680px) {
  .appbar {
    padding: 0 0.75rem;
    height: 52px;
  }

  .appbar-title {
    font-size: 0.95rem;
    max-width: 130px;
  }

  .content {
    padding: 0.5rem 0.35rem; /* Максимум полезной ширины экрана для таблицы */
  }

  /* Панель добавления занятия на телефоне */
  .add-bar {
    padding: 0.6rem;
    gap: 0.4rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .add-bar input[type="date"],
  .add-bar select,
  .add-bar input[type="text"] {
    width: 100%;
    min-width: 0;
    font-size: 0.8rem;
    height: 36px;
    padding: 0 0.5rem;
  }

  .add-bar .btn-add {
    grid-column: span 2;
    width: 100%;
    height: 36px;
  }

  /* Обертка таблицы и горизонтальный скролл */
  .grid-wrap {
    border-radius: 8px;
  }

  th, td {
    padding: 0.35rem 0.25rem;
  }

  /* Компактная фиксированная колонка с ФИО студента */
  thead th.name-col,
  td.name-col {
    width: 125px;
    min-width: 125px;
    max-width: 125px;
    padding: 0.45rem 0.45rem;
    font-size: 0.75rem;
    line-height: 1.25;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    /* Четкая тень справа для визуального разделения со скроллируемыми датами */
    box-shadow: 3px 0 8px rgba(0, 0, 0, 0.22);
  }

  .student-name-text {
    max-width: 90px;
  }

  /* Колонки дат на мобильных */
  thead th.date-col {
    min-width: 58px;
    max-width: 62px;
    padding: 0.4rem 0.2rem;
  }

  .date-head-day {
    font-size: 0.76rem;
  }

  .date-head-time {
    font-size: 0.62rem;
  }

  .date-head-topic {
    display: none; /* Скрываем длинный текст темы из заголовка на узких экранах, оставляем зеленую точку */
  }

  /* Удобные для нажатия пальцем клетки */
  .cell {
    width: 38px;
    height: 38px; /* Не менее 38px для комфортного тапа без ложных срабатываний */
    border-radius: 6px;
    font-size: 0.85rem;
  }

  /* Модальное окно в виде Bottom Sheet (выезжает снизу под большой палец) */
  .overlay {
    align-items: flex-end;
    padding: 0;
  }

  .popup {
    max-width: 100%;
    border-radius: 16px 16px 0 0;
    padding: 1.25rem 1rem env(safe-area-inset-bottom, 1rem);
    border-bottom: none;
    animation: slideUp 0.22s cubic-bezier(0.16, 1, 0.3, 1);
    max-height: 85vh;
    overflow-y: auto;
  }

  @keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
  }

  .status-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.45rem;
  }

  .status-btn {
    padding: 0.75rem 0.4rem; /* Высокая область нажатия для пальца */
    font-size: 0.82rem;
  }
}

/* ==========================================================================
   СТИЛИ ДЛЯ ПАНЕЛИ АДМИНИСТРАТОРА И ВЫГРУЗКИ ОТЧЁТОВ
   ========================================================================== */

.admin-card {
  border-color: rgba(79, 70, 229, 0.4);
  position: relative;
  background: linear-gradient(135deg, var(--surface) 0%, rgba(79, 70, 229, 0.05) 100%);
}

.admin-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.2);
}

.badge-admin {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid var(--primary-border);
  vertical-align: middle;
  margin-left: 0.45rem;
}

.report-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.report-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-subtle);
}

.report-info-box {
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  margin-bottom: 1rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.report-info-box ul {
  margin: 0.35rem 0 0 1.1rem;
  padding: 0;
}

.report-info-box li {
  margin-bottom: 0.2rem;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--primary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: reportSpin 0.7s linear infinite;
  vertical-align: middle;
}

@keyframes reportSpin {
  to { transform: rotate(360deg); }
}