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

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

.auth-container {
    width: 100%;
    max-width: 400px;
}

.auth-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.auth-card h1 {
    color: #667eea;
    margin-bottom: 10px;
    font-size: 2.5em;
}

.subtitle {
    color: #666;
    margin-bottom: 30px;
    font-size: 0.9em;
}

.tab-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid #e0e0e0;
    background: white;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s;
}

.tab-btn.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.auth-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.auth-btn:hover:not(:disabled) {
    transform: translateY(-2px);
}

.auth-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #ffffff;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.message {
    margin-top: 20px;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Mobile First - Dispositivos móveis */
@media (max-width: 768px) {
    .auth-container {
        padding: 10px;
        min-height: 100vh;
        display: flex;
        align-items: flex-start;
        justify-content: flex-start;
        padding-top: 50px;
    }

    .auth-card {
        width: 100%;
        max-width: none;
        margin: 0;
        border-radius: 20px;
        padding: 30px 20px;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    }

    .auth-card h1 {
        font-size: 1.8em;
        margin-bottom: 8px;
    }

    .subtitle {
        font-size: 0.85em;
        margin-bottom: 25px;
    }

    .tab-buttons {
        margin-bottom: 25px;
    }

    .tab-btn {
        padding: 12px 16px;
        font-size: 0.9em;
        flex: 1;
    }

    .form-group {
        margin-bottom: 18px;
    }

    .form-group input {
        padding: 14px;
        font-size: 16px; /* Previne zoom no iOS */
        border-radius: 12px;
    }

    .auth-btn {
        padding: 16px;
        font-size: 1.1em;
        margin-top: 10px;
        border-radius: 12px;
    }

    .message {
        margin-top: 15px;
        padding: 12px;
        font-size: 0.9em;
    }
}

/* Tablets */
@media (min-width: 769px) and (max-width: 1024px) {
    .auth-container {
        padding: 20px;
    }

    .auth-card {
        max-width: 450px;
    }
}

/* Desktop */
@media (min-width: 1025px) {
    .auth-container {
        padding: 20px;
    }

    .auth-card {
        max-width: 400px;
    }
}

/* iOS Safari specific */
@supports (-webkit-touch-callout: none) {
    .form-group input,
    .form-group select {
        font-size: 16px !important; /* Previne zoom */
        -webkit-appearance: none;
        border-radius: 8px;
    }

    .auth-btn {
        -webkit-appearance: none;
        border-radius: 12px;
    }
}

/* Android Chrome specific */
@supports (-webkit-appearance: none) and (not (-webkit-touch-callout: none)) {
    .form-group input {
        border-radius: 8px;
    }
}