* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-1: #eef2f5;
    --bg-2: #d8dee6;
    --card: #f9fafb;
    --line: #c8d0da;
    --ink: #1e2832;
    --muted: #687482;
    --accent: #4f6579;
    --accent-deep: #394c5e;
    --danger: #a63e3e;
    --success: #2f6b57;
}

body {
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    color: var(--ink);
    background: radial-gradient(circle at 20% 0%, #f5f7f9 0%, var(--bg-1) 35%, var(--bg-2) 100%);
    min-height: 100vh;
}

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

.login-card {
    width: 100%;
    max-width: 420px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: linear-gradient(160deg, #ffffff 0%, var(--card) 100%);
    box-shadow: 0 22px 48px rgba(24, 34, 45, 0.18);
    overflow: hidden;
}

.login-head {
    padding: 30px 28px 20px;
    background: linear-gradient(140deg, var(--accent) 0%, var(--accent-deep) 100%);
    color: #eff4f8;
}

.login-head h1 {
    font-size: 1.5rem;
    margin-bottom: 8px;
    font-weight: 700;
    letter-spacing: 0.2px;
}

.login-head p {
    color: #d8e2ea;
    font-size: 0.95rem;
}

.login-body {
    padding: 24px 28px 30px;
}

.login-body label {
    display: block;
    margin-bottom: 8px;
    margin-top: 14px;
    font-weight: 600;
    color: var(--ink);
    font-size: 0.92rem;
}

.login-body input {
    width: 100%;
    padding: 12px 13px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #ffffff;
    color: var(--ink);
    font-size: 0.95rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.login-body input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(79, 101, 121, 0.2);
}

.login-body button {
    margin-top: 20px;
    width: 100%;
    border: 0;
    border-radius: 10px;
    padding: 13px 14px;
    background: linear-gradient(140deg, var(--accent) 0%, var(--accent-deep) 100%);
    color: #f4f7fa;
    font-weight: 700;
    font-size: 0.96rem;
    cursor: pointer;
    transition: transform 0.15s ease, filter 0.15s ease;
}

.login-body button:hover {
    transform: translateY(-1px);
    filter: brightness(1.05);
}

.message {
    border-radius: 10px;
    padding: 11px 12px;
    margin-bottom: 12px;
    border: 1px solid;
    font-size: 0.88rem;
}

.message.error {
    color: var(--danger);
    background: #fff2f2;
    border-color: #efc8c8;
}

.message.success {
    color: var(--success);
    background: #ecf7f3;
    border-color: #b9ddd0;
}

.message.info {
    color: #2f4d66;
    background: #edf5fb;
    border-color: #bfd8ec;
}

@media (max-width: 520px) {
    .login-shell {
        padding: 12px;
    }

    .login-head,
    .login-body {
        padding-left: 18px;
        padding-right: 18px;
    }
}