:root {
    --bg-a: #e6ebf3;
    --bg-b: #cfd8e6;
    --card: #f6f8fc;
    --line: #c1cad8;
    --text: #1c2a3d;
    --muted: #5b6a82;
    --btn: #3f597d;
    --btn-hover: #324a6a;
    --focus: #6789b4;
}

html, body {
    height: 100%;
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.55), transparent 45%),
        linear-gradient(140deg, var(--bg-a), var(--bg-b));
}

.login-page {
    min-height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    box-sizing: border-box;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(31, 45, 65, 0.15);
    padding: 28px 28px 24px;
    box-sizing: border-box;
}

.login-title {
    margin: 0;
    font-size: 30px;
    letter-spacing: 0.06em;
    text-align: center;
}

.login-subtitle {
    margin: 6px 0 24px;
    text-align: center;
    color: var(--muted);
    font-size: 14px;
}

.field {
    margin-bottom: 14px;
}

.field input {
    width: 100%;
    height: 40px;
    box-sizing: border-box;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    padding: 0 12px;
    font-size: 14px;
    color: var(--text);
}

.field input:focus {
    outline: none;
    border-color: var(--focus);
    box-shadow: 0 0 0 3px rgba(103, 137, 180, 0.22);
}

.submit {
    width: 100%;
    height: 42px;
    border: 0;
    border-radius: 6px;
    background: var(--btn);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

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

.hint {
    margin-top: 14px;
    color: var(--muted);
    font-size: 13px;
    text-align: center;
}