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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background:
        radial-gradient(circle at 20% 20%, rgba(55, 65, 81, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(15, 23, 42, 0.10) 0%, transparent 50%),
        linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: #000;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-form {
    background: #ffffff;
    border-radius: 16px;
    padding: 44px 36px;
    box-shadow:
        0 1px 3px rgba(15, 23, 42, 0.05),
        0 10px 30px rgba(15, 23, 42, 0.10),
        0 30px 60px rgba(15, 23, 42, 0.08);
    border: 1px solid rgba(15, 23, 42, 0.04);
}

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

.logo h1 {
    font-size: 2rem;
    font-weight: 800;
    color: #000;
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.logo p {
    color: #000000;
    font-size: 0.9rem;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.alert-error {
    background: #fee2e2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #dcfce7;
    color: #15803d;
    border: 1px solid #bbf7d0;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #000;
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    font-size: 15px;
    color: #000;
    background: #ffffff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #000000;
    box-shadow: 0 0 0 3px rgba(55, 65, 81, 0.12);
}

.btn-login {
    width: 100%;
    background: linear-gradient(135deg, #1f2937 0%, #000000 100%);
    color: #fff;
    border: none;
    padding: 14px 20px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: 6px;
}

.btn-login:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.25);
}

.btn-login:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.demo-info {
    margin-top: 28px;
    padding: 16px 20px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    text-align: center;
}

.demo-info p {
    margin-bottom: 4px;
    font-size: 0.85rem;
    color: #000000;
}

.demo-info code {
    background: #1f2937;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', monospace;
    color: #f9fafb;
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 480px) {
    .login-form {
        padding: 32px 24px;
    }

    .logo h1 {
        font-size: 1.75rem;
    }
}