body {
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.login-container {
    width: 100%;
    max-width: 400px;
}
.login-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px 32px;
    text-align: center;
}
.login-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 4px;
}
.login-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}
.login-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 28px;
}
.login-error {
    background: var(--danger-light);
    color: var(--danger);
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
}
.form-group-modern {
    margin-bottom: 18px;
    text-align: left;
}
.form-group-modern label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.form-group-modern input[type=text],
.form-group-modern input[type=password] {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}
.form-group-modern input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.captcha-row {
    display: flex;
    gap: 12px;
    align-items: center;
}
.captcha-row input {
    flex: 1;
}
.captcha-img {
    flex-shrink: 0;
}
.captcha-img img {
    height: 40px;
    border-radius: var(--radius-sm);
    cursor: pointer;
}
.login-btn {
    width: 100%;
    margin-top: 8px;
    height: 48px;
    font-size: 16px;
}