:root {
    --primary-color: #1a1a1a;
    --primary-light: #333333;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #ef4444;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #1a1a1a;
    --body-bg: #ffffff;
    --body-color: #1a1a1a;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --text-muted: #666666;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--body-bg);
    color: var(--body-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background-color: white;
    padding: 20px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo i {
    font-size: 18px;
}

.nav ul {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 24px;
}

.nav a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 14px;
    transition: color 0.2s ease;
}

.nav a:hover {
    color: var(--primary-color);
}

.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
    min-height: calc(100vh - 200px);
}

.footer {
    background-color: white;
    color: var(--text-muted);
    padding: 24px 0;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    margin-top: auto;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
}

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.card {
    background: white;
    border-radius: 8px;
    /* padding: 40px; */
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 16px 24px;
    font-size: 16px;
    line-height: 1.5;
    border-radius: 8px;
    transition: all 0.2s ease;
    text-decoration: none;
    cursor: pointer;
    width: 100%;
}

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-light);
    text-decoration: none;
    color: #fff;
}

.btn-secondary {
    color: var(--primary-color);
    background-color: transparent;
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: #f8f9fa;
    text-decoration: none;
}

.btn-danger {
    color: #fff;
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}

.form-group {
    margin-bottom: 24px;
}

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

.form-control {
    display: block;
    width: 100%;
    padding: 16px 20px;
    font-size: 16px;
    line-height: 1.5;
    color: var(--primary-color);
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.form-control:focus {
    color: var(--primary-color);
    background-color: #fff;
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 2px rgba(26, 26, 26, 0.1);
}

.form-control::placeholder {
    color: #999999;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 16px 0;
    }

    .container {
        padding: 0 16px;
    }

    .card {
        padding: 32px 24px;
        margin: 20px;
    }

    .main-content {
        padding: 20px 0;
    }

    .footer .container {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}