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

:root {
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --accent: #06b6d4;
  --accent-light: #67e8f9;
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow:
    0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg:
    0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl:
    0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: "Noto Sans Thai", "Inter", sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  min-height: 100vh;
  line-height: 1.6;
}

/* ===== Background Pattern ===== */
.bg-pattern {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background:
    radial-gradient(
      ellipse at 20% 50%,
      rgba(79, 70, 229, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 20%,
      rgba(6, 182, 212, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 50% 80%,
      rgba(139, 92, 246, 0.06) 0%,
      transparent 50%
    ),
    var(--gray-50);
}

/* ===== Animated Gradient Orbs ===== */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  z-index: -1;
  animation: float 20s ease-in-out infinite;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: var(--primary-light);
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.orb-2 {
  width: 300px;
  height: 300px;
  background: var(--accent);
  bottom: -50px;
  left: -50px;
  animation-delay: -7s;
}

.orb-3 {
  width: 250px;
  height: 250px;
  background: #a78bfa;
  top: 50%;
  left: 50%;
  animation-delay: -14s;
}

@keyframes float {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  25% {
    transform: translate(30px, -30px) scale(1.05);
  }
  50% {
    transform: translate(-20px, 20px) scale(0.95);
  }
  75% {
    transform: translate(20px, 10px) scale(1.02);
  }
}

/* ===== Navbar ===== */
.navbar {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.5);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--primary);
  text-decoration: none;
}

.navbar-brand .icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
}

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

/* ===== Container / Layout ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.container-sm {
  max-width: 480px;
  margin: 0 auto;
  padding: 2rem;
}

/* ===== Hero / Landing ===== */
.hero {
  min-height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-50);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  border: 1px solid var(--primary-100);
  animation: fadeInDown 0.6s ease;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1rem;
  line-height: 1.2;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--gray-500);
  max-width: 500px;
  margin-bottom: 2.5rem;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeInUp 0.6s ease 0.3s both;
}

/* ===== Cards ===== */
.card {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1.5rem;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.card-icon.primary {
  background: var(--primary-50);
  color: var(--primary);
}

.card-icon.accent {
  background: rgba(6, 182, 212, 0.1);
  color: var(--accent);
}

.card-icon.success {
  background: var(--success-light);
  color: var(--success);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-800);
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-top: 2px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: white;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

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

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
}

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  padding: 8px 16px;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--gray-100);
  color: var(--gray-800);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 10px;
}

/* ===== Form Elements ===== */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--gray-800);
  background: white;
  transition: var(--transition);
  outline: none;
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.form-input::placeholder {
  color: var(--gray-400);
}

textarea.form-input {
  min-height: 80px;
  resize: vertical;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-top: 4px;
}

/* ===== Login Page ===== */
.login-wrapper {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.login-card {
  width: 100%;
  max-width: 440px;
  animation: fadeInUp 0.5s ease;
}

.login-card .card-header {
  flex-direction: column;
  text-align: center;
  margin-bottom: 2rem;
}

.login-card .card-icon {
  width: 64px;
  height: 64px;
  font-size: 1.8rem;
  margin-bottom: 8px;
}

/* ===== Dashboard ===== */
.dashboard-header {
  margin-bottom: 2rem;
}

.dashboard-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
}

.dashboard-header p {
  color: var(--gray-500);
  margin-top: 4px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--gray-500);
}

/* ===== Import Section ===== */
.import-section {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}

.import-section h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.import-steps {
  background: var(--primary-50);
  border: 1px solid var(--primary-100);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.import-steps h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
}

.import-steps ol {
  padding-left: 1.25rem;
  font-size: 0.85rem;
  color: var(--gray-600);
}

.import-steps ol li {
  margin-bottom: 4px;
}

/* ===== Exam List ===== */
.exam-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.exam-item {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.exam-item:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
}

.exam-info {
  flex: 1;
}

.exam-name {
  font-weight: 600;
  color: var(--gray-800);
  font-size: 1rem;
}

.exam-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--gray-500);
}

.exam-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.exam-actions {
  display: flex;
  gap: 8px;
}

/* ===== Score Display ===== */
.score-header {
  text-align: center;
  margin-bottom: 2rem;
  animation: fadeInDown 0.5s ease;
}

.score-header .student-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.score-header .exam-info-text {
  color: var(--gray-500);
  font-size: 0.9rem;
}

.score-card-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.score-exam-section {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  animation: fadeInUp 0.5s ease;
}

.score-exam-title {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 1rem 1.5rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.score-table {
  width: 100%;
  border-collapse: collapse;
}

.score-table th,
.score-table td {
  padding: 12px 1.5rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
}

.score-table th {
  background: var(--gray-50);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.score-table td {
  font-size: 0.95rem;
}

.score-table tr:last-child td {
  border-bottom: none;
}

.score-table tr:hover td {
  background: var(--primary-50);
}

.score-value {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.1rem;
}

/* ===== Alerts / Messages ===== */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1rem;
  animation: fadeIn 0.3s ease;
}

.alert-success {
  background: var(--success-light);
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-error {
  background: var(--danger-light);
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.alert-warning {
  background: var(--warning-light);
  color: #92400e;
  border: 1px solid #fcd34d;
}

.alert-info {
  background: var(--primary-50);
  color: var(--primary-dark);
  border: 1px solid var(--primary-100);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--gray-400);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-state h3 {
  color: var(--gray-600);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.empty-state p {
  font-size: 0.9rem;
}

/* ===== Loading Spinner ===== */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

.spinner-dark {
  border-color: rgba(79, 70, 229, 0.2);
  border-top-color: var(--primary);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: white;
  border-radius: var(--radius-xl);
  padding: 2rem;
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.95);
  transition: var(--transition);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 1.5rem;
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .navbar {
    padding: 0 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .container {
    padding: 1rem;
  }

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

  .exam-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .exam-actions {
    width: 100%;
  }

  .exam-actions .btn {
    flex: 1;
  }

  .import-section {
    padding: 1.25rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 300px;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .score-table th,
  .score-table td {
    padding: 10px 1rem;
  }
}

/* ===== Utility ===== */
.text-center {
  text-align: center;
}
.mt-1 {
  margin-top: 0.5rem;
}
.mt-2 {
  margin-top: 1rem;
}
.mt-3 {
  margin-top: 1.5rem;
}
.mb-1 {
  margin-bottom: 0.5rem;
}
.mb-2 {
  margin-bottom: 1rem;
}
.hidden {
  display: none !important;
}

/* Page transition */
.page {
  display: none;
  animation: fadeInUp 0.4s ease;
}

.page.active {
  display: block;
}