@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  
  /* Color Palette (Light Theme based on logo.png) */
  --bg-primary: #f4f6fa;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --border-color: #e2e8f0;
  --border-glow: rgba(26, 59, 123, 0.15);
  
  --primary-color: #1a3b7b;      /* Logo Navy Blue */
  --primary-hover: #122b5c;
  --primary-glow: rgba(26, 59, 123, 0.08);
  
  --accent-color: #e5af39;       /* Logo Golden Yellow */
  --accent-hover: #cf982f;
  
  /* Gradients */
  --accent-gradient: linear-gradient(135deg, #1a3b7b 0%, #2163ba 100%);
  --gold-gradient: linear-gradient(135deg, #e5af39 0%, #cf982f 100%);
  
  --text-primary: #0f172a;       /* Dark slate text */
  --text-secondary: #475569;     /* Medium slate text */
  --text-muted: #94a3b8;         /* Light slate text */
  
  /* Status Colors */
  --color-success: #10b981;
  --color-success-glow: rgba(16, 185, 129, 0.1);
  --color-danger: #ef4444;
  --color-danger-glow: rgba(239, 68, 68, 0.1);
  --color-warning: #f59e0b;
  --color-warning-glow: rgba(245, 158, 11, 0.1);
  --color-info: #06b6d4;
  
  /* Radius & Shadows */
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-premium: 0 10px 30px -10px rgba(26, 59, 123, 0.08), 0 1px 3px rgba(0, 0, 0, 0.02);
  --shadow-glow: 0 0 20px rgba(26, 59, 123, 0.06);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

/* Background Ambient Glows */
body::before {
  content: '';
  position: absolute;
  top: -10%;
  left: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(26, 59, 123, 0.05) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
}
body::after {
  content: '';
  position: absolute;
  bottom: -10%;
  right: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(229, 175, 57, 0.04) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

/* Premium Containers & Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(26, 59, 123, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-premium);
  transition: var(--transition-smooth);
}

.glass-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-premium), var(--shadow-glow);
}

/* Elevate card when containing an open dropdown to prevent overlapping on mobile */
.glass-card:has(.dropdown-menu.show) {
  position: relative;
  z-index: 10;
}

/* Navbar */
.navbar-premium {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #e2e8f0;
  padding: 16px 0;
}

.navbar-brand-premium {
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Inputs & Form Elements */
.form-control-premium {
  background: #ffffff !important;
  border: 1px solid var(--border-color) !important;
  color: var(--text-primary) !important;
  border-radius: var(--radius-md) !important;
  padding: 12px 16px !important;
  font-size: 0.95rem !important;
  font-weight: 500 !important;
  transition: var(--transition-smooth) !important;
}

.form-control-premium:focus {
  border-color: var(--primary-color) !important;
  box-shadow: 0 0 0 3px var(--primary-glow) !important;
  outline: none !important;
}

.form-control-premium::placeholder {
  color: #94a3b8 !important;
}

.form-select-premium {
  background-color: #ffffff !important;
  border: 1px solid var(--border-color) !important;
  color: var(--text-primary) !important;
  border-radius: var(--radius-md) !important;
  padding: 12px 16px !important;
  font-size: 0.95rem !important;
  font-weight: 500 !important;
  transition: var(--transition-smooth) !important;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23475569' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e") !important;
}

.form-select-premium:focus {
  border-color: var(--primary-color) !important;
  box-shadow: 0 0 0 3px var(--primary-glow) !important;
  outline: none !important;
}

.form-select-premium option {
  background-color: #ffffff;
  color: var(--text-primary);
}

/* Buttons */
.btn-premium {
  background: var(--accent-gradient);
  border: none;
  color: white;
  padding: 12px 24px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-smooth);
  box-shadow: 0 4px 12px rgba(26, 59, 123, 0.2);
}

.btn-premium:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 59, 123, 0.3);
  filter: brightness(1.1);
  color: white;
}

.btn-premium:active {
  transform: translateY(0);
}

.btn-outline-premium {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  padding: 10px 22px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-smooth);
}

.btn-outline-premium:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-danger-premium {
  background: var(--color-danger);
  border: none;
  color: white;
  padding: 10px 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-smooth);
}

.btn-danger-premium:hover {
  background: #dc2626;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-danger-glow);
  color: white;
}

/* Accordion Upgrade */
.accordion-premium .accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md) !important;
  margin-bottom: 16px;
  box-shadow: var(--shadow-premium);
  transition: var(--transition-smooth);
}

.accordion-premium .accordion-item:hover {
  border-color: var(--border-glow);
}

.accordion-premium .accordion-header {
  border: none;
}

.accordion-premium .accordion-button {
  background: transparent;
  color: var(--text-primary);
  font-weight: 600;
  padding: 20px 24px;
  box-shadow: none !important;
  border: none;
  transition: var(--transition-smooth);
}

.accordion-premium .accordion-button:not(.collapsed) {
  background: rgba(26, 59, 123, 0.04);
  color: var(--primary-color);
  border-bottom: 1px solid var(--border-color);
}

.accordion-premium .accordion-button::after {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%230f172a' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e") !important;
  transition: var(--transition-smooth);
}

.accordion-premium .accordion-button:not(.collapsed)::after {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%231a3b7b' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e") !important;
}

.accordion-premium .accordion-body {
  background: rgba(248, 250, 252, 0.5);
  padding: 24px;
  color: var(--text-secondary);
}

/* Table Design */
.table-premium {
  color: var(--text-primary) !important;
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
}

.table-premium th {
  background-color: #f1f5f9 !important;
  color: var(--text-secondary) !important;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 1px;
  padding: 16px !important;
  border-bottom: 2px solid var(--border-color) !important;
}

.table-premium td {
  background-color: transparent !important;
  padding: 12px 16px !important;
  border-bottom: 1px solid var(--border-color) !important;
}

.table-premium tbody tr {
  transition: var(--transition-smooth);
}

.table-premium tbody tr:hover {
  background-color: rgba(26, 59, 123, 0.02) !important;
}

/* Google Sign-In Button */
.google-signin-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: white;
  color: #1f2937;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid #cbd5e1;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
  cursor: pointer;
  text-decoration: none;
}

.google-signin-btn:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
}

.google-signin-btn svg {
  width: 20px;
  height: 20px;
}

/* Stat Cards */
.stat-card {
  text-align: center;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(26, 59, 123, 0.05) 0%, rgba(229, 175, 57, 0.05) 100%);
  border: 1px solid rgba(26, 59, 123, 0.12);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at top right, rgba(229, 175, 57, 0.08), transparent 60%);
  pointer-events: none;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 8px;
}

/* Sticky Footer */
footer {
  margin-top: auto;
  border-top: 1px solid #e2e8f0;
  background: #ffffff;
  backdrop-filter: blur(8px);
  padding: 24px 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-align: center;
}

footer a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-smooth);
}

footer a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.footer-meta {
  color: var(--text-muted);
  margin-top: 6px;
  font-size: 0.8rem;
}

/* Modern Input Groups */
.input-group-premium {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #ffffff;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.input-group-premium:focus-within {
  border-color: var(--primary-color) !important;
  box-shadow: 0 0 0 3px var(--primary-glow) !important;
}

.input-group-premium .input-group-text {
  background: transparent !important;
  border: none !important;
  padding-left: 14px !important;
  padding-right: 6px !important;
  color: var(--text-secondary);
}

.input-group-premium .form-control-premium {
  border: none !important;
  background: transparent !important;
  padding-left: 6px !important;
  box-shadow: none !important;
}

/* Modern Grade Button Selector */
.btn-grade {
  border-radius: 20px !important;
  font-size: 0.8rem !important;
  font-weight: 600 !important;
  padding: 6px 14px !important;
  transition: var(--transition-smooth) !important;
  border: 1px solid transparent !important;
  cursor: pointer;
}

.active-grade {
  background: var(--accent-gradient) !important;
  color: #ffffff !important;
  box-shadow: 0 4px 10px rgba(26, 59, 123, 0.2) !important;
}

.inactive-grade {
  background: #f1f5f9 !important;
  color: var(--text-secondary) !important;
  border-color: #cbd5e1 !important;
}

.inactive-grade:hover:not(:disabled) {
  background: #e2e8f0 !important;
  color: var(--text-primary) !important;
  border-color: #94a3b8 !important;
}

.btn-grade:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background: #f8fafc !important;
  border-color: #e2e8f0 !important;
  color: var(--text-muted) !important;
}

/* Custom Dropdown Grade Picker & Badges */
.btn-select-grade {
  background: #ffffff !important;
  border: 1px solid var(--border-color) !important;
  border-radius: var(--radius-md) !important;
  padding: 10px 14px !important;
  font-size: 0.95rem !important;
  font-weight: 500 !important;
  transition: var(--transition-smooth) !important;
  box-shadow: none !important;
  color: var(--text-primary) !important;
}

.btn-select-grade:hover:not(:disabled) {
  border-color: var(--primary-color) !important;
  box-shadow: 0 4px 12px rgba(26, 59, 123, 0.04) !important;
  background: #fafbfc !important;
}

.btn-select-grade:focus {
  border-color: var(--primary-color) !important;
  box-shadow: 0 0 0 3px var(--primary-glow) !important;
}

/* Color-coded Grade Badges (Pills) */
.grade-badge-O {
  background-color: #eef2ff !important;
  color: #4f46e5 !important;
  border: 1px solid rgba(79, 70, 229, 0.2) !important;
}
.grade-badge-A-plus {
  background-color: #eff6ff !important;
  color: #2563eb !important;
  border: 1px solid rgba(37, 99, 235, 0.2) !important;
}
.grade-badge-A {
  background-color: #ecfeff !important;
  color: #0891b2 !important;
  border: 1px solid rgba(8, 145, 178, 0.2) !important;
}
.grade-badge-B-plus {
  background-color: #f0fdfa !important;
  color: #0d9488 !important;
  border: 1px solid rgba(13, 148, 136, 0.2) !important;
}
.grade-badge-B {
  background-color: #f0fdf4 !important;
  color: #16a34a !important;
  border: 1px solid rgba(22, 163, 74, 0.2) !important;
}
.grade-badge-C {
  background-color: #fffbeb !important;
  color: #d97706 !important;
  border: 1px solid rgba(217, 119, 6, 0.2) !important;
}
.grade-badge-arrear {
  background-color: #fef2f2 !important;
  color: #dc2626 !important;
  border: 1px solid rgba(220, 38, 38, 0.2) !important;
}

.grade-badge-pill {
  font-size: 0.8rem !important;
  font-weight: 700 !important;
  padding: 4px 10px !important;
  border-radius: 20px !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 32px !important;
  height: 22px !important;
}

/* Sleeker Table Row Transitions */
.table-premium tbody tr {
  transition: var(--transition-smooth) !important;
}

.table-premium tbody tr:hover {
  background-color: rgba(26, 59, 123, 0.015) !important;
}

/* Modern Input Polish */
.input-group-premium .form-control-premium {
  transition: var(--transition-smooth) !important;
  background-color: transparent !important;
}

.input-group-premium .form-control-premium:focus {
  background-color: #ffffff !important;
}

/* Chart Container & Premium Visual styles */
.chart-card-header {
  border-bottom: 1px solid rgba(26, 59, 123, 0.06);
}

.chart-wrapper {
  position: relative;
  width: 100%;
  height: 320px;
  max-height: 320px;
}

/* Offline mode animation & premium styling */
@keyframes pulse-subtle {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.85;
    transform: scale(0.995);
  }
}

.offline-alert-premium {
  animation: pulse-subtle 3s infinite ease-in-out;
  border-left: 4px solid var(--color-danger) !important;
  background: rgba(254, 242, 242, 0.8) !important;
  backdrop-filter: blur(16px);
  box-shadow: 0 4px 20px rgba(239, 68, 68, 0.05);
}