/* =========================================================
   DAVOMAT TIZIMI (DESIGN SYSTEM)
   ========================================================= */

:root {
  /* Color Palette - Premium Dark Indigo & Vivid Accents */
  --bg-primary: #0b0f19;
  --bg-surface: #111827;
  --bg-surface-elevated: #162032;
  --bg-card: rgba(22, 32, 50, 0.75);
  --bg-card-hover: rgba(30, 43, 67, 0.85);
  --bg-glass: rgba(17, 24, 39, 0.82);

  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-focus: rgba(99, 102, 241, 0.5);
  --border-color-subtle: rgba(255, 255, 255, 0.04);

  /* Primary Accent & Brand */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  --primary-glow: rgba(99, 102, 241, 0.35);

  /* Attendance Status Colors */
  --status-present: #10b981;
  --status-present-bg: rgba(16, 185, 129, 0.12);
  --status-present-border: rgba(16, 185, 129, 0.35);
  --status-present-glow: rgba(16, 185, 129, 0.3);

  --status-absent: #f43f5e;
  --status-absent-bg: rgba(244, 63, 94, 0.12);
  --status-absent-border: rgba(244, 63, 94, 0.35);
  --status-absent-glow: rgba(244, 63, 94, 0.3);

  --status-reason: #f59e0b;
  --status-reason-bg: rgba(245, 158, 11, 0.12);
  --status-reason-border: rgba(245, 158, 11, 0.35);
  --status-reason-glow: rgba(245, 158, 11, 0.3);

  --status-late: #8b5cf6;
  --status-late-bg: rgba(139, 92, 246, 0.12);
  --status-late-border: rgba(139, 92, 246, 0.35);
  --status-late-glow: rgba(139, 92, 246, 0.3);

  /* Telegram Brand */
  --telegram: #0088cc;
  --telegram-hover: #0077b5;
  --telegram-glow: rgba(0, 136, 204, 0.4);

  /* Text Colors */
  --text-main: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-inverse: #ffffff;

  /* Typography */
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Shadows & Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px var(--primary-glow);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
}

/* App Container Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* =========================================================
   SIDEBAR
   ========================================================= */
.sidebar {
  width: 270px;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.sidebar-header {
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid var(--border-color);
}

.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #6366f1, #4338ca);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px var(--primary-glow);
  flex-shrink: 0;
}

.logo-text h2 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-pro {
  font-size: 0.65rem;
  font-weight: 700;
  background: #3b82f6;
  color: #fff;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.logo-text p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 160px;
}

/* Navigation */
.nav-menu {
  flex: 1;
  padding: 18px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  width: 100%;
}

.nav-item:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-main);
}

.nav-item.active {
  background: var(--primary-light);
  color: #818cf8;
  border-color: rgba(99, 102, 241, 0.3);
}

.nav-item svg {
  flex-shrink: 0;
}

.badge-counter {
  margin-left: auto;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-weight: 700;
}



/* Mobile Bottom Navigation */
.mobile-nav {
  display: none;
}

/* =========================================================
   MAIN CONTENT
   ========================================================= */
.main-content {
  flex: 1;
  min-width: 0;
  padding: 28px 36px 60px 36px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.topbar-left h1 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.topbar-left .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 2px;
}

/* Tab contents */
.tab-content {
  display: none;
  flex-direction: column;
  gap: 20px;
  animation: fadeIn 0.2s ease-in-out;
}

.tab-content.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   UI COMPONENTS (CARDS, BUTTONS, INPUTS)
   ========================================================= */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.section-header-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 8px;
}

.section-header-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.actions-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.text-muted {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 20px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  font-family: inherit;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-sm {
  padding: 7px 12px;
  font-size: 0.82rem;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
}

.btn-danger-ghost {
  background: rgba(244, 63, 94, 0.08);
  color: #f43f5e;
  border: 1px solid rgba(244, 63, 94, 0.2);
}

.btn-danger-ghost:hover {
  background: rgba(244, 63, 94, 0.16);
  border-color: rgba(244, 63, 94, 0.4);
}

.btn-telegram {
  background: linear-gradient(135deg, #0088cc, #0077b5);
  color: #fff;
  box-shadow: 0 4px 14px var(--telegram-glow);
}

.btn-telegram:hover {
  box-shadow: 0 6px 20px rgba(0, 136, 204, 0.55);
  transform: translateY(-1px);
}

/* Inputs & Form controls */
.input-field, .textarea-field {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.92rem;
  font-family: inherit;
  transition: all var(--transition-fast);
  outline: none;
}

.input-field:focus, .textarea-field:focus {
  border-color: var(--border-color-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.select-field {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* Form group */
.form-group {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-grid button {
  grid-column: 1 / -1;
  justify-self: start;
  margin-top: 8px;
}

/* =========================================================
   ATTENDANCE TAB SPECIFICS
   ========================================================= */
.control-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px 22px;
}

.control-row {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-width: 190px;
}

.control-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.search-group {
  flex: 1.5;
  min-width: 220px;
}

.quick-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color-subtle);
}

.quick-btns {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-pills {
  display: flex;
  align-items: center;
  gap: 6px;
}

.pill {
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pill:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.pill.active {
  background: var(--bg-surface-elevated);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.pill-absent.active {
  background: var(--status-absent-bg);
  color: var(--status-absent);
  border-color: var(--status-absent-border);
}

.pill-reason.active {
  background: var(--status-reason-bg);
  color: var(--status-reason);
  border-color: var(--status-reason-border);
}

/* Stats Cards Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-icon {
  font-size: 1.6rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
}

.stat-body {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-percent {
  margin-left: auto;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--status-present);
  background: var(--status-present-bg);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.stat-present .stat-num { color: var(--status-present); }
.stat-absent .stat-num { color: var(--status-absent); }
.stat-reason .stat-num { color: var(--status-reason); }
.stat-late .stat-num { color: var(--status-late); }

/* Student Cards List for Attendance */
.student-list-card {
  padding: 20px;
}

.list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color-subtle);
}

.list-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.list-counter {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.student-cards-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Individual Student Attendance Card */
.student-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: all var(--transition-fast);
  gap: 16px;
}

.student-card:hover {
  background: var(--bg-surface-elevated);
  border-color: rgba(255, 255, 255, 0.15);
}

.student-card-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  flex: 1;
}

.student-num-badge {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 50%;
  flex-shrink: 0;
}

.student-details {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.student-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.student-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.reason-tag {
  color: var(--status-reason);
  background: var(--status-reason-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.reason-tag:hover {
  text-decoration: underline;
}

/* Attendance Action Buttons */
.attendance-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.att-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 38px;
}

.att-btn:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-main);
}

.att-btn.active-present {
  background: var(--status-present);
  color: #ffffff;
  border-color: var(--status-present);
  box-shadow: 0 2px 10px var(--status-present-glow);
}

.att-btn.active-absent {
  background: var(--status-absent);
  color: #ffffff;
  border-color: var(--status-absent);
  box-shadow: 0 2px 10px var(--status-absent-glow);
}

.att-btn.active-reason {
  background: var(--status-reason);
  color: #111827;
  border-color: var(--status-reason);
  box-shadow: 0 2px 10px var(--status-reason-glow);
}

.att-btn.active-late {
  background: var(--status-late);
  color: #ffffff;
  border-color: var(--status-late);
  box-shadow: 0 2px 10px var(--status-late-glow);
}

/* =========================================================
   TABLES & LISTS (STUDENTS TAB)
   ========================================================= */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.data-table th {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color-subtle);
  color: var(--text-main);
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.table-row-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.action-icon-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-icon-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.action-icon-btn.danger:hover {
  background: rgba(244, 63, 94, 0.15);
  color: #f43f5e;
  border-color: rgba(244, 63, 94, 0.4);
}

.progress-pill-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 160px;
}

.progress-bar-bg {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--status-present);
  transition: width 0.3s ease;
}

.progress-bar-fill.warning {
  background: var(--status-reason);
}

.progress-bar-fill.danger {
  background: var(--status-absent);
}

.progress-pill-label {
  font-size: 0.8rem;
  font-weight: 700;
  width: 38px;
}

/* =========================================================
   ANALYTICS TAB
   ========================================================= */
.analytics-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 20px;
}

.stat-card-analytics {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 30px;
}

.radial-progress-wrapper {
  margin: 20px 0;
}

.progress-ring-box {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--bg-surface-elevated) 60%, transparent 62%),
              conic-gradient(var(--status-present) 0% 88%, rgba(255, 255, 255, 0.08) 88% 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.15);
}

.progress-big-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.progress-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.analytics-mini-stats {
  display: flex;
  gap: 24px;
  margin-top: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.analytics-mini-stats strong {
  color: #fff;
}

.warning-card {
  display: flex;
  flex-direction: column;
}

.card-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.warning-students-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.warning-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border: 1px solid rgba(244, 63, 94, 0.25);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.warning-item-name {
  font-weight: 700;
  font-size: 0.92rem;
}

.warning-item-badge {
  background: var(--status-absent-bg);
  color: var(--status-absent);
  font-weight: 700;
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.history-date {
  font-weight: 700;
  font-size: 0.95rem;
}

.history-counts {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
}

/* =========================================================
   SETTINGS TAB
   ========================================================= */
.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.backup-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.file-upload-btn {
  cursor: pointer;
}

/* =========================================================
   MODAL DIALOGS
   ========================================================= */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-backdrop.open {
  display: flex;
  animation: fadeIn 0.15s ease-out;
}

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-dialog.modal-md {
  max-width: 600px;
}

.modal-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 800;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.6rem;
  cursor: pointer;
  line-height: 1;
  padding: 4px;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: #fff;
}

.modal-body {
  padding: 22px;
}

.modal-footer {
  padding: 16px 22px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.modal-title-with-icon {
  display: flex;
  align-items: center;
  gap: 12px;
}

.modal-icon-badge {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.telegram-badge {
  background: linear-gradient(135deg, #0088cc, #0077b5);
  box-shadow: 0 4px 12px var(--telegram-glow);
}

.modal-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.telegram-preview-box {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  background: #0d131f;
  border-color: rgba(0, 136, 204, 0.3);
  color: #e2e8f0;
  resize: vertical;
}

.bulk-tip {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 10px;
  background: rgba(255, 255, 255, 0.03);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.modal-hint {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.reason-quick-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 20px;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.empty-state h4 {
  font-size: 1.2rem;
  margin-bottom: 6px;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 360px;
  margin-bottom: 18px;
}

.hidden {
  display: none !important;
}

/* =========================================================
   TOAST NOTIFICATIONS
   ========================================================= */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 10000;
}

.toast {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.25s ease-out;
  min-width: 260px;
}

.toast.success {
  border-left: 4px solid var(--status-present);
}

.toast.info {
  border-left: 4px solid var(--primary);
}

.toast.warning {
  border-left: 4px solid var(--status-reason);
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* =========================================================
   RESPONSIVE DESIGN (MOBILE & TABLET)
   ========================================================= */
@media (max-width: 900px) {
  .analytics-grid, .settings-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    display: none;
  }

  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100vw;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 8px 12px;
    z-index: 99;
    justify-content: space-around;
    backdrop-filter: blur(12px);
  }

  .mobile-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    padding: 4px 8px;
  }

  .mobile-nav-btn.active {
    color: var(--primary);
  }

  .main-content {
    padding: 18px 16px 80px 16px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .topbar-right {
    width: 100%;
  }

  .topbar-right .btn {
    width: 100%;
  }

  .student-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .attendance-actions {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }

  .att-btn {
    padding: 8px 4px;
    font-size: 0.78rem;
    justify-content: center;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }
}