:root {
    --bg: #f5efe4;
    --card: #fffaf0;
    --ink: #1f2937;
    --accent: #0f766e;
    --accent-dark: #115e59;
    --bad: #b91c1c;
    --ok: #166534;
    --line: #d6c9ad;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 20% 10%, #fef3c7 0%, transparent 35%),
        radial-gradient(circle at 85% 90%, #bae6fd 0%, transparent 30%),
        var(--bg);
    padding: 24px;
}

.card {
    width: 100%;
    max-width: 520px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 14px 28px rgba(31, 41, 55, 0.12);
}

h1 {
    margin: 0;
    font-size: 2rem;
}

.subtitle {
    margin-top: 6px;
    color: #4b5563;
}

form {
    margin-top: 18px;
    display: grid;
    gap: 10px;
}

label {
    font-weight: 700;
}

input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 1rem;
}

button {
    margin-top: 6px;
    border: none;
    border-radius: 10px;
    padding: 11px 14px;
    background: var(--accent);
    color: #ffffff;
    font-weight: 700;
    cursor: pointer;
}

button:hover {
    background: var(--accent-dark);
}

#status {
    min-height: 1.4rem;
    margin-top: 12px;
    font-weight: 700;
}

#status.ok {
    color: var(--ok);
}

#status.bad {
    color: var(--bad);
}

.hidden {
    display: none;
}

#flag-box {
    margin-top: 14px;
    border: 1px dashed var(--accent);
    background: #ecfeff;
    border-radius: 10px;
    padding: 12px;
}

.flag {
    font-family: Consolas, "Courier New", monospace;
    font-weight: 700;
}