:root {
    --surface: #ffffff;
    --text: #172033;
    --muted: #667085;
    --primary: #0f766e;
    --primary-dark: #115e59;
    --line: #dce6ef;
    --danger: #b42318;
    --success: #047857;
    --radius: 8px;
    --shadow: 0 22px 55px rgba(23, 32, 51, 0.16);
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    display: grid;
    place-items: center;
    padding: 28px;
    color: var(--text);
    background:
        linear-gradient(130deg, rgba(15, 118, 110, 0.94), rgba(23, 32, 51, 0.86)),
        url("https://images.unsplash.com/photo-1503376780353-7e6692767b70?auto=format&fit=crop&w=1600&q=80") center/cover;
    font-family: Arial, Helvetica, sans-serif;
}

a {
    color: inherit;
    text-decoration: none;
}

.login-shell {
    width: min(100%, 980px);
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(255, 255, 255, 0.45);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.login-info {
    padding: 42px;
    color: #ffffff;
    background: #172033;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 64px;
    font-weight: 800;
}

.brand-mark {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    background: var(--primary);
    border-radius: var(--radius);
}

.login-info h1,
.login-card h2 {
    margin: 0;
    line-height: 1.1;
    letter-spacing: 0;
}

.login-info h1 {
    max-width: 380px;
    font-size: clamp(34px, 5vw, 54px);
}

.login-info p {
    max-width: 360px;
    color: #cbd5e1;
    font-size: 16px;
    line-height: 1.7;
}

.login-list {
    display: grid;
    gap: 12px;
    margin: 32px 0 0;
    padding: 0;
    list-style: none;
    color: #dcefee;
}

.login-list li {
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius);
    font-weight: 700;
}

.login-card {
    padding: 48px;
}

.login-card h2 {
    font-size: 30px;
}

.login-card p {
    margin: 10px 0 28px;
    color: var(--muted);
}

.alert {
    margin-bottom: 18px;
    padding: 13px 14px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 700;
}

.alert-danger {
    color: var(--danger);
    background: #fef3f2;
    border: 1px solid #fecdca;
}

.alert-success {
    color: var(--success);
    background: #ecfdf3;
    border: 1px solid #abefc6;
}

.field {
    margin-bottom: 16px;
}

.field label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
}

.field input {
    width: 100%;
    min-height: 48px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    color: var(--text);
    background: #ffffff;
    font: inherit;
    outline: none;
}

.field input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.12);
}

.btn {
    width: 100%;
    min-height: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: var(--radius);
    color: #ffffff;
    background: var(--primary);
    box-shadow: 0 14px 28px rgba(15, 118, 110, 0.24);
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

.btn:hover {
    background: var(--primary-dark);
}

.demo-box {
    margin-top: 22px;
    padding: 14px;
    color: var(--muted);
    background: #f8fafc;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    font-size: 14px;
    line-height: 1.7;
}

.back-link {
    display: inline-flex;
    margin-top: 18px;
    color: var(--primary-dark);
    font-weight: 800;
}

@media (max-width: 820px) {
    body {
        padding: 16px;
    }

    .login-shell {
        grid-template-columns: 1fr;
    }

    .login-info,
    .login-card {
        padding: 30px;
    }

    .brand {
        margin-bottom: 34px;
    }
}