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

:root {
  /* Color Palette - Daylight Theme & FPT Brand Colors */
  --primary: #f26f21; /* FPT Orange */
  --primary-hover: #d95a12;
  --primary-light: rgba(242, 111, 33, 0.08);
  
  --secondary: #0054a5; /* FPT Blue */
  --secondary-hover: #004080;
  --secondary-light: rgba(0, 84, 165, 0.08);
  
  --bg-gradient: linear-gradient(135deg, #f3f4f6 0%, #f9fafb 100%);
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(0, 84, 165, 0.08);
  --card-hover-bg: #ffffff;
  --card-hover-border: rgba(242, 111, 33, 0.3);
  
  --text-primary: #1f2937; /* Dark slate text */
  --text-secondary: #4b5563; /* Medium grey text */
  --text-muted: #6b7280; /* Darker grey for better contrast */
  
  --success: #10b981;
  --success-light: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;
  --warning-light: rgba(245, 158, 11, 0.1);
  --danger: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.05);
  
  /* Fonts */
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Layout */
  --max-width: 1440px;
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
  --shadow-glow: 0 4px 14px rgba(242, 111, 33, 0.25);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background: #f9fafb;
  background-image: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* Scrollbar Style */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.02);
}
::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* Glassmorphism Light */
.glass {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}

/* App Header */
.app-header {
  height: 80px;
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
}

.brand-logo {
  height: 48px;
  width: auto;
}

.brand-text {
  font-family: var(--font-display);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-email {
  font-size: 0.875rem;
  color: var(--secondary);
  background: var(--secondary-light);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid rgba(0, 84, 165, 0.15);
  font-weight: 500;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--border-radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  gap: 8px;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.btn-secondary:hover {
  background: #f9fafb;
  color: var(--secondary);
  border-color: rgba(0, 84, 165, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

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

/* Authentication Page */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 460px;
  border-radius: var(--border-radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid rgba(0, 84, 165, 0.1);
}

.auth-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(242, 111, 33, 0.04) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
}

.auth-header {
  position: relative;
  z-index: 1;
  text-align: center;
  margin-bottom: 32px;
}

.auth-header h2 {
  font-size: 1.75rem;
  color: var(--secondary);
  margin-bottom: 8px;
}

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

.form-group {
  position: relative;
  z-index: 1;
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  background: #ffffff;
  border: 1px solid #d1d5db;
  border-radius: var(--border-radius-sm);
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: var(--transition);
  font-family: var(--font-body);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(242, 111, 33, 0.12);
}

/* Dashboard Page */
.dashboard-page {
  padding: 40px 0;
}

/* Statistics row */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  border-radius: var(--border-radius-md);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  background: #ffffff;
  border: 1px solid rgba(0, 84, 165, 0.08);
  box-shadow: var(--shadow-sm);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 1.25rem;
}

.stat-info h3 {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: 4px;
  color: var(--secondary);
}

.stat-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Filters & Search section */
.search-filter-bar {
  border-radius: var(--border-radius-md);
  padding: 24px;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(0, 84, 165, 0.08);
}

.search-box {
  position: relative;
  flex: 1;
}

.search-box i {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
}

.search-box .form-control {
  padding-left: 48px;
  background: #ffffff;
  border-color: #d1d5db;
}

.search-box .form-control:focus {
  border-color: var(--primary);
}

.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.filter-select {
  background: #ffffff;
  border: 1px solid #d1d5db;
  color: var(--text-primary);
  padding: 10px 16px;
  border-radius: var(--border-radius-sm);
  font-family: var(--font-body);
  font-size: 0.875rem;
  cursor: pointer;
  min-width: 180px;
  outline: none;
  transition: var(--transition);
}

.filter-select:focus {
  border-color: var(--primary);
}

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

/* Card list grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
}

.topic-card {
  border-radius: var(--border-radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 320px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid rgba(0, 84, 165, 0.06);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
}

.topic-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary);
  opacity: 0;
  transition: var(--transition);
}

.topic-card:hover {
  transform: translateY(-4px);
  background: var(--card-hover-bg);
  border-color: var(--card-hover-border);
  box-shadow: var(--shadow-lg);
}

.topic-card:hover::after {
  opacity: 1;
}

.topic-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-orange {
  background: var(--primary-light);
  color: var(--primary);
}

.badge-blue {
  background: var(--secondary-light);
  color: var(--secondary);
}

.badge-status {
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
}

.status-pending {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.status-matched {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.topic-content {
  flex-grow: 1;
  margin-bottom: 20px;
}

.topic-title {
  font-size: 1.15rem;
  font-family: var(--font-display);
  margin-bottom: 12px;
  line-height: 1.4;
  color: var(--secondary); /* Brand Navy */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 3.2em;
  transition: var(--transition);
}

.topic-card:hover .topic-title {
  color: var(--primary); /* Hover transition to Orange */
}

.topic-abstract {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
  line-height: 1.6;
}

.topic-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.keyword-tag {
  background: rgba(0, 84, 165, 0.04);
  border: 1px solid rgba(0, 84, 165, 0.08);
  color: var(--secondary);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

.topic-footer {
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.student-info {
  display: flex;
  flex-direction: column;
}

.student-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.student-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Modal Styling */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

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

.modal-container {
  width: 90%;
  max-width: 800px;
  max-height: 85vh;
  border-radius: var(--border-radius-lg);
  overflow-y: auto;
  padding: 40px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform 0.3s ease;
  background: #ffffff;
  border: 1px solid rgba(0, 84, 165, 0.1);
}

.modal-overlay.active .modal-container {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  gap: 20px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding-bottom: 16px;
}

.modal-header h2 {
  font-size: 1.5rem;
  color: var(--secondary);
  line-height: 1.3;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.75rem;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1;
}

.modal-close:hover {
  color: var(--danger);
}

.modal-body {
  margin-bottom: 32px;
}

.info-section {
  margin-bottom: 24px;
}

.info-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  font-weight: 700;
}

.info-value {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.info-value-highlight {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  padding: 16px;
  border-radius: var(--border-radius-sm);
  line-height: 1.6;
  color: var(--text-primary);
}

.student-details-card {
  background: var(--primary-light);
  border: 1px solid rgba(242, 111, 33, 0.15);
  border-radius: var(--border-radius-md);
  padding: 20px;
  margin-top: 24px;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 12px;
}

.modal-footer {
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding-top: 24px;
  display: flex;
  justify-content: flex-end;
  gap: 16px;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-left: 4px solid var(--primary);
  border-radius: var(--border-radius-sm);
  padding: 16px 24px;
  color: var(--text-primary);
  min-width: 320px;
  max-width: 440px;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transform: translateX(120%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
  transform: translateX(0);
}

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

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

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

/* Loading Spinner */
.spinner {
  border: 3px solid rgba(0, 84, 165, 0.1);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  display: inline-block;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Utilities */
.text-center { text-align: center; }
.hidden { display: none !important; }

/* Responsive adjustments */
@media (max-width: 768px) {
  .app-header {
    height: auto;
    padding: 16px 0;
  }
  .header-content {
    flex-direction: column;
    gap: 12px;
  }
  .search-filter-bar {
    padding: 16px;
  }
  .filters-row {
    flex-direction: column;
    align-items: stretch;
  }
  .filter-select {
    width: 100%;
  }
  .modal-container {
    padding: 24px;
  }
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 16px;
  color: var(--text-muted);
}

/* --- Phase 2 Tabs & Form Styles --- */
.tabs-nav {
  display: flex;
  gap: 8px;
  background: rgba(0, 84, 165, 0.03);
  padding: 6px;
  border-radius: 30px;
  border: 1px solid rgba(0, 84, 165, 0.05);
}

.tab-btn {
  background: transparent;
  border: none;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px 20px;
  border-radius: 20px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  color: var(--primary);
  background: rgba(242, 111, 33, 0.04);
}

.tab-btn.active {
  color: #ffffff;
  background: var(--primary);
  box-shadow: 0 4px 12px rgba(242, 111, 33, 0.2);
}

/* Responsive modal forms */
@media (max-width: 600px) {
  #studentIdeaForm .modal-body,
  #lecturerProposalForm .modal-body {
    grid-template-columns: 1fr !important;
  }
  .section-header-row {
    flex-direction: column;
    align-items: stretch !important;
  }
  #actionButtonArea button {
    width: 100%;
  }
}

/* Custom inputs inside forms */
input[type="radio"] {
  accent-color: var(--primary);
  width: 18px;
  height: 18px;
}

textarea.form-control {
  resize: vertical;
  line-height: 1.5;
}

/* Action button header badge styling */
.action-badge {
  background: var(--primary-light);
  border: 1px solid rgba(242, 111, 33, 0.2);
  border-radius: var(--border-radius-sm);
  padding: 12px;
  margin-bottom: 24px;
  font-size: 0.9rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-action-bar {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: 4px;
}

/* Main Navigation Menu in Header */
.main-nav {
  display: flex;
  gap: 16px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  padding: 8px 16px;
  border-radius: 20px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(242, 111, 33, 0.04);
}

.nav-link.active {
  color: #ffffff;
  background: var(--primary);
  box-shadow: 0 4px 10px rgba(242, 111, 33, 0.15);
}

.page-view {
  display: block;
  animation: fadeIn 0.4s ease-out;
}

.page-view.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
  .app-header {
    height: auto;
    padding: 16px 0;
  }
  .header-content {
    flex-direction: column;
    gap: 16px;
  }
  .main-nav {
    width: 100%;
    justify-content: center;
  }
}