@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-gradient: linear-gradient(135deg, #0f172a, #020617);
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --secondary-color: #a855f7;
  --secondary-hover: #9333ea;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-glow: rgba(99, 102, 241, 0.15);
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
}

body {
  background: var(--bg-gradient);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Background grid effect */
body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(rgba(99, 102, 241, 0.08) 1px, transparent 0),
                    radial-gradient(rgba(168, 85, 247, 0.05) 1px, transparent 0);
  background-size: 40px 40px;
  background-position: 0 0, 20px 20px;
  z-index: -1;
  pointer-events: none;
}

/* Glass panel base */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
  box-shadow: 0 8px 32px 0 rgba(99, 102, 241, 0.08);
}

/* Navbar */
header {
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.25rem;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-name {
  font-weight: 500;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
}

/* Buttons */
.btn {
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff;
  box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(99, 102, 241, 0.45);
}

.btn-danger {
  background: rgba(239, 68, 110, 0.15);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

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

/* Layout Main Container */
main {
  flex: 1;
  padding: 2.5rem 2rem;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

/* Login Container */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 2rem;
}

.login-card {
  width: 100%;
  max-width: 420px;
  padding: 2.5rem;
  text-align: center;
}

.login-header {
  margin-bottom: 2rem;
}

.login-header .logo-icon {
  margin: 0 auto 1rem auto;
  width: 60px;
  height: 60px;
  font-size: 2rem;
  border-radius: 14px;
}

.login-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

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

.form-group {
  margin-bottom: 1.25rem;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.input-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: all 0.2s ease;
}

.input-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px var(--glass-glow);
}

.login-btn {
  width: 100%;
  padding: 0.8rem;
  font-size: 1rem;
  margin-top: 1rem;
}

/* Admin / Student Dashboard Headers */
.dashboard-title-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.dashboard-title-section h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.dashboard-title-section p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* Grid layout for Admin views */
.admin-grid {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 2rem;
}

@media (max-width: 900px) {
  .admin-grid {
    grid-template-columns: 1fr;
  }
}

/* Sidebar forms */
.sidebar-panel {
  padding: 1.75rem;
  height: fit-content;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.panel-title {
  font-size: 1.2rem;
  font-weight: 600;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 0.75rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Upload zone */
.upload-dropzone {
  border: 2px dashed rgba(99, 102, 241, 0.3);
  border-radius: 10px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  background: rgba(15, 23, 42, 0.3);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.upload-dropzone:hover {
  border-color: var(--primary-color);
  background: rgba(99, 102, 241, 0.05);
}

.upload-dropzone p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.upload-dropzone input {
  display: none;
}

.file-selected-indicator {
  font-size: 0.9rem;
  color: var(--success);
  font-weight: 500;
  margin-top: 0.5rem;
  word-break: break-all;
}

/* Tabs list */
.tab-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  background: rgba(15, 23, 42, 0.5);
  padding: 0.4rem;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  width: fit-content;
}

.tab-btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  padding: 0.5rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s ease;
  font-size: 0.85rem;
}

.tab-btn.active {
  background: var(--primary-color);
  color: #fff;
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
}

.tab-content {
  display: none;
}

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

/* Content cards / List views */
.content-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.content-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem;
  border-radius: 12px;
  gap: 1rem;
}

.item-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.item-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 1.25rem;
}

.item-icon.pdf {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.25);
  color: #fca5a5;
}

.item-details h4 {
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.item-details p {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 0.75rem;
}

.badge {
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-violet {
  background: rgba(168, 85, 247, 0.15);
  color: #d8b4fe;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.badge-indigo {
  background: rgba(99, 102, 241, 0.15);
  color: #c7d2fe;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(2, 6, 23, 0.8);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  width: 100%;
  max-width: 440px;
  padding: 2rem;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 0.75rem;
}

.modal-header h3 {
  font-size: 1.25rem;
}

.close-btn {
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

.close-btn:hover {
  color: var(--text-main);
}

/* Student portal card layout */
.student-filter-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-categories {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-pill {
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-pill.active, .filter-pill:hover {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

.search-wrapper {
  position: relative;
  width: 300px;
}

@media (max-width: 600px) {
  .search-wrapper {
    width: 100%;
  }
}

.student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.student-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  height: 100%;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.card-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-body p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-footer {
  margin-top: auto;
  border-top: 1px solid var(--glass-border);
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.file-size {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Toast notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 1000;
}

.toast {
  padding: 1rem 1.5rem;
  border-radius: 8px;
  background: #1e293b;
  border-left: 4px solid var(--primary-color);
  color: #fff;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transform: translateY(100px);
  opacity: 0;
  animation: slideIn 0.3s forwards;
  min-width: 250px;
}

.toast.success {
  border-left-color: var(--success);
}

.toast.error {
  border-left-color: var(--danger);
}

@keyframes slideIn {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Empty State placeholder */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  grid-column: 1 / -1;
}

.empty-state-icon {
  font-size: 3rem;
  color: rgba(99, 102, 241, 0.3);
}

/* Helper spacing */
.mt-4 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.w-100 { width: 100%; }

/* Table styling for manage student tab */
.student-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.student-table th, .student-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.student-table th {
  font-weight: 600;
  color: var(--text-muted);
}