:root {
  --primary-color: #6366f1;
  --secondary-color: #64748b;
  --success-color: #16a34a;
  --danger-color: #dc2626;
  --bg-color: #eef1f8;
  --white: #ffffff;
  --border-color: #e2e8f0;
  --text-color: #1e293b;

  --primary-strong: #4f46e5;
  --accent: #7c3aed;
  --info: #0ea5e9;
  --warning: #f59e0b;

  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #f1f5f9;
  --muted: #64748b;
  --heading: #0f172a;

  --sidebar-grad: linear-gradient(
    170deg,
    #4f46e5 0%,
    #6d28d9 55%,
    #7c3aed 100%
  );
  --sidebar-text: #e9e7ff;
  --sidebar-muted: #c4b5fd;

  --primary-grad: linear-gradient(135deg, #6366f1 0%, #7c3aed 100%);
  --primary-soft: #eef2ff;

  --ring: rgba(99, 102, 241, 0.35);
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 18px 40px rgba(15, 23, 42, 0.14);

  --radius: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
}

[data-theme="dark"] {
  --primary-color: #818cf8;
  --secondary-color: #94a3b8;
  --success-color: #22c55e;
  --danger-color: #f87171;
  --bg-color: #0b1120;
  --white: #1e293b;
  --border-color: #334155;
  --text-color: #e2e8f0;

  --primary-strong: #a78bfa;
  --accent: #a78bfa;
  --info: #38bdf8;
  --warning: #fbbf24;

  --surface: #131c31;
  --surface-2: #1b2540;
  --surface-3: #243049;
  --muted: #94a3b8;
  --heading: #f1f5f9;

  --sidebar-grad: linear-gradient(
    170deg,
    #1e1b4b 0%,
    #2e1065 60%,
    #3b0764 100%
  );
  --sidebar-text: #ddd6fe;
  --sidebar-muted: #a78bfa;

  --primary-grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --primary-soft: #1e1b4b;

  --ring: rgba(129, 140, 248, 0.45);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 22px 48px rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
}

a {
  text-decoration: none;
  color: var(--primary-color);
}

h1,
h3,
h4 {
  margin-top: 0;
  color: var(--heading);
}

::selection {
  background: var(--primary-color);
  color: #fff;
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
*::-webkit-scrollbar-thumb {
  background: rgba(120, 120, 140, 0.4);
  border-radius: 999px;
}
*::-webkit-scrollbar-thumb:hover {
  background: rgba(120, 120, 140, 0.6);
}

.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 15% 0%, #6d28d9 0%, transparent 55%),
    radial-gradient(1000px 700px at 100% 100%, #4f46e5 0%, transparent 50%),
    linear-gradient(160deg, #312e81 0%, #1e1b4b 100%);
}
.auth-wrap::before,
.auth-wrap::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(8px);
  opacity: 0.35;
}
.auth-wrap::before {
  width: 380px;
  height: 380px;
  background: #a78bfa;
  top: -120px;
  right: -80px;
}
.auth-wrap::after {
  width: 300px;
  height: 300px;
  background: #38bdf8;
  bottom: -120px;
  left: -60px;
  opacity: 0.25;
}

.auth-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 22px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  padding: 38px 32px;
  color: #1e293b;
  animation: pop-in 0.5s cubic-bezier(0.21, 1.02, 0.73, 1);
}
.auth-card label,
.auth-card .small {
  color: #475569;
  font-weight: 600;
}
.auth-card h1 {
  color: #4f46e5 !important;
}
.auth-card .fa-user-graduate {
  color: #6d28d9 !important;
}
.auth-card input {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  color: #1e293b;
}

@keyframes pop-in {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.dashboard-wrapper,
.modern-student {
  display: flex;
  min-height: 100vh;
  background: var(--bg-color);
}

.modern-sidebar,
.sidebar {
  width: 256px;
  flex-shrink: 0;
  background: var(--sidebar-grad);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  padding: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  box-shadow: 4px 0 24px rgba(15, 23, 42, 0.12);
  z-index: 30;
}

.sidebar-logo {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #fff;
  padding: 26px 24px 22px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  background: transparent;
  text-align: left;
}
.sidebar-logo::before {
  content: "\f19d"; /* graduation cap */
  font-family: "Font Awesome 5 Free";
  font-weight: 900;
  font-size: 1.3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 14px;
  flex: 1;
  overflow-y: auto;
}
.sidebar-menu a {
  color: var(--sidebar-text);
  font-weight: 500;
  padding: 11px 14px;
  border-radius: 12px;
  transition:
    background 0.18s,
    color 0.18s,
    transform 0.12s;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}
.sidebar-menu a i {
  width: 20px;
  text-align: center;
  font-size: 1rem;
  color: var(--sidebar-muted);
  transition: color 0.18s;
}
.sidebar-menu a:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}
.sidebar-menu a.active,
.sidebar-menu a.tab-link.active {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  font-weight: 600;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}
.sidebar-menu a.active i,
.sidebar-menu a:hover i {
  color: #fff;
}
.sidebar-menu a.active::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 22px;
  border-radius: 0 4px 4px 0;
  background: #fff;
}
.logout-btn {
  margin-top: auto;
  color: #fecaca !important;
  font-weight: 600;
}
.logout-btn:hover {
  background: rgba(239, 68, 68, 0.22) !important;
  color: #fff !important;
}
.logout-btn i {
  color: #fecaca !important;
}

.modern-main,
.main-content {
  flex: 1;
  min-width: 0;
  padding: 24px 32px 40px;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 26px;
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 14px 18px;
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.topbar-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0;
  color: var(--heading);
}
.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.menu-toggle {
  display: none;
  border: none;
  background: var(--surface-3);
  color: var(--text-color);
  width: 42px;
  height: 42px;
  border-radius: 12px;
  font-size: 1.1rem;
  cursor: pointer;
}

.theme-toggle {
  border: 1px solid var(--border-color);
  background: var(--surface-2);
  color: var(--text-color);
  width: 42px;
  height: 42px;
  border-radius: 12px;
  font-size: 1.05rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition:
    transform 0.15s,
    background 0.18s,
    color 0.18s;
}
.theme-toggle:hover {
  transform: rotate(-12deg);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.profile-chip {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border-color);
  padding: 6px 14px 6px 6px;
  border-radius: var(--radius-pill);
}
.profile-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.profile-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--heading);
}
.role-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--primary-strong);
}

.avatar-circle {
  width: 38px;
  height: 38px;
  background: var(--primary-grad);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 4px 12px var(--ring);
  flex-shrink: 0;
}

.modern-header,
.main-header {
  margin: 0;
}

.modern-card,
.card,
.data-card {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 26px;
}
.modern-card-title,
.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}
.modern-card-title i,
.card-title i {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary-color);
  font-size: 0.95rem;
}

.modern-stats,
.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin-bottom: 4px;
}
.modern-stat,
.stat-item {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition:
    transform 0.18s,
    box-shadow 0.18s,
    border-color 0.18s;
  position: relative;
  overflow: hidden;
}
.modern-stat::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--primary-grad);
}
.modern-stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.stat-icon {
  font-size: 1.4rem;
  color: #fff;
  background: var(--primary-grad);
  border-radius: 14px;
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px var(--ring);
  flex-shrink: 0;
}
.stat-info h3 {
  margin: 0 0 2px 0;
  font-size: 1.7rem;
  color: var(--heading);
  font-weight: 800;
  line-height: 1;
}
.stat-info p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.stat-box {
  flex: 1;
  min-width: 200px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
  background: var(--surface-2);
}
.stat-label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}
.stat-box strong {
  font-size: 24px;
  color: var(--heading);
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-sm);
}
table,
.modern-table,
.styled-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--surface);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
th,
td,
.modern-table th,
.modern-table td {
  padding: 13px 16px;
  text-align: left;
  font-size: 0.92rem;
  vertical-align: middle;
  border: none;
  border-bottom: 1px solid var(--border-color);
}
thead th,
.modern-table th {
  background: var(--surface-3);
  color: var(--muted);
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
  border-bottom: 1px solid var(--border-color);
}
tbody tr {
  transition: background 0.13s;
}
tbody tr:hover {
  background: var(--surface-2);
}
tbody tr:last-child td {
  border-bottom: none;
}

tr:nth-child(even) {
  background: transparent;
}

.easy-mark-table th,
.easy-mark-table td {
  vertical-align: middle !important;
  font-size: 0.92rem;
}
.easy-mark-table input[type="number"],
.easy-mark-table input[type="text"] {
  margin: 0;
  outline: none;
  transition:
    border 0.2s,
    box-shadow 0.2s;
}
.easy-mark-table input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--ring);
}

input,
select,
textarea {
  width: 100%;
  padding: 10px 13px;
  margin: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-family: inherit;
  background: var(--surface-2);
  color: var(--text-color);
  transition:
    border-color 0.18s,
    box-shadow 0.18s,
    background 0.18s;
}
input::placeholder,
textarea::placeholder {
  color: var(--muted);
  opacity: 0.8;
}
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--ring);
}
label {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-color);
}
input[type="file"] {
  padding: 8px 10px;
  cursor: pointer;
}
input[type="file"]::file-selector-button {
  margin-right: 12px;
  border: none;
  background: var(--primary-soft);
  color: var(--primary-strong);
  padding: 7px 14px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}

.grid-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
  align-items: end;
  margin-bottom: 22px;
  padding: 18px;
  background: var(--surface-2);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
}

.btn {
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  padding: 10px 18px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition:
    transform 0.12s,
    box-shadow 0.18s,
    filter 0.18s,
    opacity 0.18s;
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}
.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
  box-shadow: var(--shadow);
}
.btn:active {
  transform: translateY(0);
}
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  filter: none;
}
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--ring);
}
.btn-primary {
  background: var(--primary-grad);
}
.btn-success {
  background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
}
.btn-danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}
.btn-secondary {
  background: linear-gradient(135deg, #64748b 0%, #475569 100%);
}
.btn-info {
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
}
.btn-sm {
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: 8px;
}

#btnShowAttHistory {
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.alert {
  padding: 12px 16px;
  margin: 12px 0;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}
.alert-success {
  background: #dcfce7;
  color: #166534;
  border-color: #bbf7d0;
}
.alert-error {
  background: #fee2e2;
  color: #991b1b;
  border-color: #fecaca;
}
[data-theme="dark"] .alert-success {
  background: rgba(34, 197, 94, 0.15);
  color: #86efac;
  border-color: rgba(34, 197, 94, 0.35);
}
[data-theme="dark"] .alert-error {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border-color: rgba(239, 68, 68, 0.35);
}

.hidden {
  display: none !important;
}
.muted {
  color: var(--muted);
}
.small {
  font-size: 0.78rem;
}
.simple-list {
  margin: 0;
  padding-left: 18px;
}
.simple-list li {
  margin-bottom: 8px;
}

.tab-content {
  animation: fade-in 0.28s ease;
}
@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}
nav {
  background: var(--sidebar-grad);
  padding: 14px 0;
  color: #fff;
  margin-bottom: 20px;
}
.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.4px;
}
.menu {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.menu a {
  color: #fff;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 6px;
}
.menu a.active,
.menu a:hover {
  background: rgba(255, 255, 255, 0.16);
}
.row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.col-half {
  flex: 1;
  min-width: 260px;
}
h3 {
  font-weight: 700;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  inset: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.55);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
}
.modal-content {
  background: var(--surface);
  color: var(--text-color);
  margin: 6% auto;
  padding: 26px;
  border-radius: var(--radius);
  max-width: 900px;
  position: relative;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  animation: pop-in 0.3s ease;
}
.modal-content h3 {
  margin-top: 0;
  color: var(--heading);
}
#closeAttHistory {
  position: absolute;
  top: 14px;
  right: 20px;
  font-size: 26px;
  cursor: pointer;
  color: var(--muted);
  transition:
    color 0.2s,
    transform 0.2s;
  line-height: 1;
}
#closeAttHistory:hover {
  color: var(--danger-color);
  transform: rotate(90deg);
}

@media (max-width: 992px) {
  .modern-sidebar,
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.28s ease;
    width: 260px;
  }
  .dashboard-wrapper.sidebar-open .modern-sidebar,
  .dashboard-wrapper.sidebar-open .sidebar,
  .modern-student.sidebar-open .modern-sidebar,
  .modern-student.sidebar-open .sidebar {
    transform: translateX(0);
  }
  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    z-index: 25;
  }
  .sidebar-open .sidebar-backdrop {
    display: block;
  }
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .modern-main,
  .main-content {
    padding: 16px;
  }
}

@media (max-width: 600px) {
  .topbar {
    flex-wrap: wrap;
    padding: 12px;
  }
  .topbar-title {
    font-size: 1.15rem;
  }
  .profile-meta {
    display: none;
  }
  .modern-card,
  .card,
  .data-card {
    padding: 18px;
  }
  .grid-form {
    grid-template-columns: 1fr;
  }
}