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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f7f8fa;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-card {
    background: #ffffff;
    border: 1px solid #e6e8eb;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    width: 100%;
    max-width: 420px;
    padding: 36px 32px;
}

.auth-card h1 {
    font-size: 22px;
    color: #1a1a1a;
    margin-bottom: 6px;
    text-align: center;
}

.auth-card p.subtitle {
    text-align: center;
    color: #6b7280;
    font-size: 14px;
    margin-bottom: 24px;
}

.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    font-size: 13px;
    color: #374151;
    margin-bottom: 6px;
    font-weight: 600;
}

.form-group input {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s;
}

.form-group input:focus { border-color: #2563eb; }

.captcha-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.captcha-row img {
    border-radius: 6px;
    border: 1px solid #d1d5db;
    height: 46px;
}

.captcha-refresh {
    font-size: 12px;
    color: #2563eb;
    cursor: pointer;
    text-decoration: underline;
    background: none;
    border: none;
}

button.btn-primary {
    width: 100%;
    padding: 12px;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

button.btn-primary:hover { background: #1d4ed8; }

.alert {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 16px;
}

.alert-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }

.auth-links {
    text-align: center;
    margin-top: 18px;
    font-size: 13px;
    color: #6b7280;
}

.auth-links a { color: #2563eb; text-decoration: none; }
.auth-links a:hover { text-decoration: underline; }