:root {
    --bg: #0c1117;
    --panel: #141b23;
    --line: #293545;
    --text: #e8eef5;
    --muted: #96a5b5;
    --accent: #58d0a7;
    --danger: #e27777;
    --sans: "Segoe UI", "Microsoft YaHei", sans-serif;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    background: radial-gradient(circle at top, #1a2430 0%, #0c1117 58%);
    color: var(--text);
    font-family: var(--sans);
}

body {
    min-height: 100vh;
}

button,
input {
    font: inherit;
}

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

.login-card {
    width: min(420px, 100%);
    padding: 28px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: rgba(20, 27, 35, 0.96);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.32);
}

.login-head h1 {
    margin: 0 0 10px;
    font-size: 1.45rem;
}

.login-head p,
.login-message {
    margin: 0;
    color: var(--muted);
    line-height: 1.5;
}

.login-form {
    display: grid;
    gap: 12px;
    margin: 20px 0 14px;
}

.login-form label {
    font-size: 0.9rem;
    color: var(--muted);
}

.login-form input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #0f151c;
    color: var(--text);
    outline: none;
}

.login-form input:focus {
    border-color: var(--accent);
}

.login-form button {
    border: 1px solid #36745e;
    border-radius: 12px;
    padding: 12px 14px;
    background: var(--accent);
    color: #08110e;
    cursor: pointer;
}

.login-form button:disabled {
    opacity: 0.7;
    cursor: wait;
}

.login-message.is-error {
    color: var(--danger);
}