static/css/style.css

/* Modern UI styling for Auth App with automatic light/dark theme */
:root {
    /* Base colors (light theme) */
    --primary: #4361ee;
    --primary-light: #4cc9f0;
    --primary-dark: #3a0ca3;
    --success: #4ade80;
    --danger: #f87171;
    --text: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-dark: #f3f4f6;
    --card-bg: #ffffff;
    --card-border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
  }
  
  /* Dark theme colors - will be applied when system prefers dark mode */
  @media (prefers-color-scheme: dark) {
    :root {
      --primary: #5d7aff;
      --primary-light: #70d6ff;
      --primary-dark: #9b5de5;
      --success: #56f2a3;
      --danger: #ff6b6b;
      --text: #e5e7eb;
      --text-light: #9ca3af;
      --bg-light: #111827;
      --bg-dark: #0f172a;
      --card-bg: #1f2937;
      --card-border: #374151;
      --shadow: rgba(0, 0, 0, 0.3);
    }
  }
  
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: linear-gradient(135deg, var(--bg-light), var(--bg-dark));
    min-height: 100vh;
    padding: 2rem;
    transition: background-color 0.5s ease, color 0.5s ease;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
  }
  
  .app-header {
    text-align: center;
    margin-bottom: 2rem;
    animation: fadeIn 0.8s ease;
  }
  
  .app-title {
    font-size: 2.5rem;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
    font-weight: 600;
  }
  
  .app-subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 400;
  }
  
  .auth-section {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 4px 16px var(--shadow);
    padding: 2rem;
    margin: 0 auto 2rem;
    max-width: 480px;
    transition: var(--transition);
    animation: slideUp 0.5s ease;
  }
  
  .auth-section:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
  }
  
  .section-title {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    font-weight: 600;
    position: relative;
    padding-bottom: 0.75rem;
  }
  
  .section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    height: 3px;
    width: 60px;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    border-radius: 1.5px;
  }
  
  .form-group {
    margin-bottom: 1.5rem;
  }
  
  label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text);
  }
  
  input[type="email"],
  input[type="password"] {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
  }
  
  input[type="email"]:focus,
  input[type="password"]:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
  }
  
  .btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--primary);
    color: white;
  }
  
  .btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
  }
  
  .btn:active {
    transform: translateY(0);
  }
  
  .btn-full {
    width: 100%;
  }
  
  .btn-success {
    background-color: var(--success);
  }
  
  .btn-success:hover {
    background-color: #3eb76a;
  }
  
  .btn-danger {
    background-color: var(--danger);
  }
  
  .btn-danger:hover {
    background-color: #e05252;
  }
  
  .status-message {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    font-weight: 500;
    display: none;
    background-color: rgba(248, 113, 113, 0.1);
    color: var(--danger);
    border-left: 4px solid var(--danger);
  }
  
  .status-message.success {
    background-color: rgba(74, 222, 128, 0.1);
    color: #16a34a;
    border-color: var(--success);
  }
  
  .switch-auth {
    margin-top: 1.5rem;
    text-align: center;
    color: var(--text-light);
  }
  
  .switch-auth a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
  }
  
  .switch-auth a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
  }
  
  #welcome-section {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 4px 16px var(--shadow);
    padding: 2rem;
    margin: 0 auto;
    max-width: 800px;
    animation: fadeIn 0.8s ease;
  }
  
  .welcome-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
  }
  
  #welcome-message {
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--primary-dark);
    margin-bottom: 1rem;
  }
  
  .divider {
    margin: 2rem 0;
    height: 1px;
    background-color: var(--card-border);
  }
  
  .notifications-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
  }
  
  #notifications {
    background-color: var(--bg-light);
    border-radius: var(--radius);
    padding: 1rem;
    min-height: 100px;
    max-height: 350px;
    overflow-y: auto;
    border: 1px solid var(--card-border);
  }
  
  #notifications p {
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    border-radius: var(--radius);
    background-color: var(--card-bg);
    border-left: 3px solid var(--primary-light);
    box-shadow: 0 2px 4px var(--shadow);
    animation: fadeIn 0.3s ease;
  }
  
  #notifications p:last-child {
    margin-bottom: 0;
  }
  
  #notifications p em {
    color: var(--text-light);
    font-style: italic;
  }
  
  /* Animation keyframes */
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  
  @keyframes slideUp {
    from { 
      opacity: 0;
      transform: translateY(20px);
    }
    to { 
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  /* Theme transition */
  * {
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  }
  
  /* Responsive styles */
  @media (max-width: 768px) {
    body {
      padding: 1rem;
    }
    
    .app-title {
      font-size: 2rem;
    }
    
    .auth-section {
      padding: 1.5rem;
      margin-bottom: 1.5rem;
    }
  }
  
  @media (max-width: 480px) {
    .app-title {
      font-size: 1.8rem;
    }
    
    .section-title {
      font-size: 1.5rem;
    }
    
    .auth-section {
      padding: 1.25rem;
    }
    
    .btn {
      padding: 0.7rem 1.25rem;
    }
  }