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

:root {
  --primary: #0066CC;
  --primary-dark: #0052A3;
  --primary-light: #3385D6;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-900: #111827;
  --success: #10B981;
  --error: #EF4444;
  --warning: #F59E0B;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
.header {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: 1rem 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

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

.logo svg {
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.tagline {
  font-size: 0.875rem;
  color: var(--gray-600);
  font-weight: 500;
}

.language-selector {
  display: flex;
  gap: 0.5rem;
  background: var(--gray-100);
  padding: 0.25rem;
  border-radius: 8px;
}

.lang-btn {
  background: transparent;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: all 0.3s ease;
}

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

.lang-btn.active {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 4px rgba(0, 102, 204, 0.2);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #0066CC 0%, #004C99 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 0%, #B3D9FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 700px;
  margin: 0 auto;
}

/* Upload Section */
.upload-section {
  padding: 4rem 0;
}

.card {
  background: white;
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
  margin-bottom: 3rem;
}

.card h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--gray-900);
}

.file-input-wrapper {
  margin-bottom: 1.5rem;
}

.file-input-wrapper input[type="file"] {
  display: none;
}

.file-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--gray-300);
  border-radius: 12px;
  padding: 3rem 2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--gray-50);
}

.file-label:hover {
  border-color: var(--primary);
  background: rgba(0, 102, 204, 0.05);
}

.upload-icon {
  color: var(--primary);
  margin-bottom: 1rem;
}

.file-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 0.5rem;
}

.file-info {
  font-size: 0.875rem;
  color: var(--gray-600);
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 102, 204, 0.2);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 102, 204, 0.3);
}

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

.btn-primary svg {
  flex-shrink: 0;
}

.status-container {
  margin-top: 2rem;
  padding: 1rem;
  border-radius: 8px;
  font-weight: 500;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.status-container.loading {
  background: rgba(0, 102, 204, 0.1);
  color: var(--primary);
  border: 1px solid var(--primary-light);
}

.status-container.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid var(--success);
}

.status-container.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid var(--error);
}

/* Loading Spinner Overlay */
.spinner-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  backdrop-filter: blur(4px);
}

.spinner-overlay.active {
  display: flex;
}

.spinner-container {
  text-align: center;
  background: white;
  padding: 3rem;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.spinner {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  border: 6px solid var(--gray-200);
  border-top: 6px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.spinner-text {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.5rem;
}

.spinner-subtext {
  font-size: 0.875rem;
  color: var(--gray-600);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 102, 204, 0.1);
  border-radius: 12px;
  color: var(--primary);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--gray-900);
}

.feature-card p {
  color: var(--gray-600);
  line-height: 1.6;
}

/* Info Section */
.info-section {
  padding: 4rem 0;
  background: white;
}

.info-section h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 3rem;
  color: var(--gray-900);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.step {
  text-align: center;
}

.step-number {
  width: 60px;
  height: 60px;
  margin: 0 auto 1rem;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
}

.step h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--gray-900);
}

.step p {
  color: var(--gray-600);
  line-height: 1.5;
}

/* Footer */
.footer {
  background: var(--gray-900);
  color: white;
  padding: 2rem 0;
  text-align: center;
  margin-top: 4rem;
}

.footer p {
  margin: 0.5rem 0;
}

.footer-tagline {
  color: var(--gray-300);
  font-size: 0.875rem;
}

/* Login Page Styles */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #0066CC 0%, #004C99 100%);
  padding: 2rem;
}

.login-container {
  width: 100%;
  max-width: 450px;
}

.login-card {
  background: white;
  border-radius: 16px;
  padding: 3rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

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

.login-header svg {
  margin: 0 auto 1.5rem;
  display: block;
}

.login-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.login-header p {
  color: var(--gray-600);
  font-size: 0.875rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 600;
  color: var(--gray-700);
  font-size: 0.875rem;
}

.form-group input {
  padding: 0.875rem 1rem;
  border: 2px solid var(--gray-300);
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.3s ease;
  font-family: inherit;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

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

.login-error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  padding: 0.875rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  border: 1px solid var(--error);
  text-align: center;
}

.btn-login {
  margin-top: 0.5rem;
  padding: 1rem 1.5rem;
}

.language-selector-login {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--gray-200);
}

.login-footer {
  text-align: center;
  margin-top: 2rem;
  color: white;
  font-size: 0.875rem;
  opacity: 0.9;
}

.login-footer p {
  margin: 0;
}

/* Logout button */
.logout-btn {
  background: transparent;
  border: 1px solid var(--gray-300);
  color: var(--gray-600);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logout-btn:hover {
  background: var(--gray-100);
  color: var(--error);
  border-color: var(--error);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

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

  .card {
    padding: 1.5rem;
  }

  .features-grid,
  .steps-grid {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 1rem;
  }

  .header-content {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }

  .nav {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
    width: 100%;
  }

  .language-selector {
    width: 100%;
    justify-content: center;
  }

  .lang-btn {
    flex: 1;
    text-align: center;
  }

  .login-card {
    padding: 2rem;
  }

  .login-body {
    padding: 1rem;
  }
}