:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #1f4f82;
    --primary-dark: #173b62;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.login-page {
    min-height: 100vh;
    background: linear-gradient(180deg, #f8fafc 0%, #eef2f7 100%);
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 18px;
}

.login-card {
    width: 100%;
    max-width: 430px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 28px;
    box-shadow: 0 10px 32px rgba(15, 23, 42, 0.12);
}

.login-brand {
    text-align: center;
    margin-bottom: 24px;
}

.login-brand img {
    display: block;
    width: 100%;
    max-width: 260px;
    height: auto;
    margin: 0 auto 18px;
}

.login-brand h1 {
    margin: 0;
    font-size: 28px;
    color: var(--primary);
}

.login-brand p {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.login-card form {
    display: block;
}

.login-card label {
    display: block;
    margin-bottom: 15px;
    font-weight: bold;
    font-size: 14px;
}

.login-card input {
    display: block;
    width: 100%;
    margin-top: 7px;
    padding: 12px 13px;
    border: 1px solid var(--border);
    border-radius: 9px;
    font-size: 15px;
    background: #fff;
}

.login-card input:focus {
    outline: 2px solid rgba(31, 79, 130, 0.22);
    border-color: var(--primary);
}

.login-card button {
    width: 100%;
    margin-top: 8px;
    background: var(--primary);
    color: #fff;
    padding: 13px 16px;
    border: 0;
    border-radius: 10px;
    cursor: pointer;
    font-weight: bold;
    font-size: 15px;
}

.login-card button:hover {
    background: var(--primary-dark);
}

.alert {
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 18px;
    font-size: 14px;
}

.alert.error {
    background: #fff5f5;
    border: 1px solid #fecaca;
    color: #7f1d1d;
}

.alert.warning {
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #78350f;
}

.login-footer {
    margin-top: 20px;
    font-size: 12px;
    color: var(--muted);
    text-align: center;
    line-height: 1.45;
}

@media (max-width: 520px) {
    .login-card {
        padding: 22px;
    }

    .login-brand img {
        max-width: 220px;
    }
}