:root {
    --background: #07111f;
    --panel: #0d1929;
    --border: #223149;
    --input: #081321;
    --primary: #4657f5;
    --text: #f3f6ff;
    --muted: #9aa8bc;
    --danger: #ffb4b4;
    --danger-bg: #431b24;
    --success: #a9f3d1;
    --success-bg: #123c32;
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    padding: 24px;
    display: grid;
    place-items: center;
    font-family: Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, #10264b, transparent 35%),
        var(--background);
}

.login-container {
    width: 100%;
    max-width: 440px;
}

.brand {
    margin-bottom: 22px;
    text-align: center;
}

.brand-mark {
    display: inline-grid;
    width: 52px;
    height: 52px;
    margin-bottom: 10px;
    place-items: center;
    border-radius: 14px;
    font-size: 25px;
    background: linear-gradient(135deg, #2475ff, #5942ee);
}

.brand h1 {
    margin: 0;
    font-size: 25px;
}

.brand p {
    margin: 8px 0 0;
    color: var(--muted);
}

.login-card {
    padding: 30px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(13, 25, 41, 0.96);
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.35);
}

.login-card h2 {
    margin: 0 0 8px;
}

.instruction {
    margin: 0 0 22px;
    color: var(--muted);
}

label {
    display: block;
    margin: 16px 0 7px;
    font-size: 14px;
}

input {
    width: 100%;
    padding: 13px;
    color: var(--text);
    background: var(--input);
    border: 1px solid #33445f;
    border-radius: 8px;
    outline: none;
}

input:focus {
    border-color: #6172ff;
    box-shadow: 0 0 0 3px rgba(70, 87, 245, 0.18);
}

button {
    width: 100%;
    margin-top: 22px;
    padding: 13px;
    color: white;
    font-weight: bold;
    background: linear-gradient(135deg, #2475ff, #5942ee);
    border: 0;
    border-radius: 8px;
    cursor: pointer;
}

button:hover {
    filter: brightness(1.1);
}

.message {
    padding: 12px;
    margin-bottom: 18px;
    border-radius: 8px;
    font-size: 14px;
}

.message-error {
    color: var(--danger);
    background: var(--danger-bg);
}

.message-success {
    color: var(--success);
    background: var(--success-bg);
}

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