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

:root {
    --primary: #1e3a5f;
    --primary-light: #2d5a8f;
    --background: #ffffff;
    --surface: #f8f9fa;
    --text-primary: #1e3a5f;
    --text-secondary: #6c757d;
    --border: #e9ecef;
    --shadow: rgba(30, 58, 95, 0.08);
    --success: #28a745;
    --error: #dc3545;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, var(--surface) 0%, #e3e8ef 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    max-width: 450px;
    width: 100%;
    background: var(--background);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--shadow);
}

@media (max-width: 480px) {
    .container {
        padding: 30px 24px;
    }
}

.logo {
    text-align: center;
    margin-bottom: 32px;
}

.logo h1 {
    color: var(--primary);
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}

.logo p {
    color: var(--text-secondary);
    font-size: 14px;
}

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    background: var(--surface);
    padding: 4px;
    border-radius: 12px;
}

.tab {
    flex: 1;
    padding: 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.tab.active {
    background: var(--background);
    color: var(--primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.form-container {
    display: none;
}

.form-container.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

label {
    display: block;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.2s;
    background: var(--background);
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 8px;
}

.submit-btn:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 58, 95, 0.2);
}

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

.submit-btn:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
}

.alert.show {
    display: block;
    animation: fadeIn 0.3s;
}

.alert.error {
    background: #fff5f5;
    color: var(--error);
    border: 1px solid var(--error);
}

.alert.success {
    background: #f0fdf4;
    color: var(--success);
    border: 1px solid var(--success);
}

.footer {
    margin-top: 32px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
}