:root {
    --bg: #f1f4f3;
    --surface: #ffffff;
    --ink: #171b1d;
    --muted: #667076;
    --line: #d6dcda;
    --green: #176d49;
    --green-dark: #105438;
    --red: #9d3034;
    --red-soft: #f9e8e8;
    --shadow: 0 14px 36px rgba(23, 27, 29, 0.09);
}

* { box-sizing: border-box; }

html { min-width: 320px; background: var(--bg); }

body {
    min-width: 320px;
    min-height: 100vh;
    margin: 0;
    background:
        linear-gradient(rgba(23, 27, 29, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(23, 27, 29, 0.025) 1px, transparent 1px),
        var(--bg);
    background-size: 28px 28px;
    color: var(--ink);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 14px;
    letter-spacing: 0;
}

button, input { font: inherit; letter-spacing: 0; }

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 28px 20px;
}

.login-panel {
    width: min(100%, 420px);
    padding: 34px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.brand-block {
    display: flex;
    align-items: center;
    gap: 11px;
}

.brand-mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 6px;
    background: var(--ink);
    color: #fff;
    font-size: 16px;
    font-weight: 800;
}

.brand-block strong,
.brand-block span {
    display: block;
}

.brand-block strong {
    font-size: 14px;
    line-height: 1.1;
}

.brand-block span {
    margin-top: 4px;
    color: var(--muted);
    font-size: 11px;
}

.login-heading {
    margin: 38px 0 24px;
}

.login-heading p {
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
}

.login-heading h1 {
    margin: 0;
    font-size: 24px;
    line-height: 1.2;
}

.message {
    margin-bottom: 18px;
    padding: 11px 12px;
    border: 1px solid;
    border-radius: 5px;
    font-size: 12px;
    line-height: 1.45;
}

.message-error {
    border-color: #e4b5b7;
    background: var(--red-soft);
    color: var(--red);
}

form {
    display: grid;
    gap: 10px;
}

label {
    margin-top: 7px;
    color: #3d4549;
    font-size: 12px;
    font-weight: 700;
}

input {
    width: 100%;
    height: 44px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 5px;
    outline: none;
    background: #fff;
    color: var(--ink);
}

input:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(23, 109, 73, 0.12);
}

button {
    height: 44px;
    margin-top: 14px;
    border: 0;
    border-radius: 5px;
    background: var(--green);
    color: #fff;
    cursor: pointer;
    font-weight: 750;
}

button:hover { background: var(--green-dark); }
button:focus-visible { outline: 3px solid rgba(23, 109, 73, 0.22); outline-offset: 2px; }
button:disabled { cursor: not-allowed; opacity: 0.48; }

@media (max-width: 480px) {
    .login-shell { padding: 18px 14px; }
    .login-panel { padding: 28px 22px; }
}