:root {
    --bg: #ecfdf5;
    --card: #ffffff;
    --primary: #0f766e;
    --primary-dark: #115e59;
    --text: #0f172a;
    --muted: #64748b;
    --danger: #dc2626;
    --border: #dbe7e2;
    --shadow: 0 24px 60px rgba(15, 23, 42, .16);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(20, 184, 166, .22), transparent 34%),
        linear-gradient(135deg, #ecfdf5, #f8fafc);
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 28px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.brand {
    display: flex;
    gap: 14px;
    align-items: center;
    margin-bottom: 24px;
}

.brand-mark {
    width: 54px;
    height: 54px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: .5px;
}

.brand h1 {
    margin: 0;
    font-size: 28px;
}

.brand p {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.login-form {
    display: grid;
    gap: 16px;
}

.login-form label {
    display: grid;
    gap: 7px;
    font-size: 14px;
    font-weight: 700;
}

.login-form input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 13px 14px;
    font-size: 15px;
    outline: none;
}

.login-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, .12);
}

.login-form button {
    border: 0;
    border-radius: 16px;
    padding: 14px 18px;
    background: var(--primary);
    color: #fff;
    font-size: 16px;
    font-weight: 800;
    cursor: pointer;
}

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

.alerts {
    display: grid;
    gap: 8px;
    margin-bottom: 16px;
}

.alert {
    padding: 11px 12px;
    border-radius: 12px;
    font-size: 14px;
}

.alert-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

.login-foot {
    text-align: center;
    color: var(--muted);
    margin: 20px 0 0;
    font-size: 13px;
}