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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
    max-width: 450px;
    width: 100%;
    text-align: center;
}

/* Largeur adaptative pour grands écrans */
@media (min-width: 769px) {
    .container {
        max-width: 700px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 800px;
    }
}

.header {
    margin-bottom: 30px;
}

.header h1 {
    color: #333;
    font-size: 28px;
    margin-bottom: 8px;
}

.header p {
    color: #666;
    font-size: 14px;
}

.loading {
    padding: 20px;
    color: #666;
}

.google-signin {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 20px 0;
}

.google-signin-button {
    background: #4285f4;
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
    font-weight: 500;
}

.google-signin-button:hover {
    background: #357ae8;
}

.error-message {
    background: #fee;
    border: 1px solid #fcc;
    border-radius: 8px;
    padding: 16px;
    margin-top: 20px;
}

.error-message p {
    color: #c33;
    font-size: 14px;
    line-height: 1.5;
}

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }
    
    .header h1 {
        font-size: 24px;
    }
}