:root {
    --red: #B92D36;
    --ink: #1a1a1a;
    --muted: #5e5e5e;
    --line: #e6e6e6;
    --bg: #f3f3f4;
    --green: #1b7f3a;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font: 16px/1.5 system-ui, sans-serif;
    color: var(--ink);
    background: var(--bg);
}

header {
    position: sticky;
    top: 0;
    background: #fff;
    border-bottom: 2px solid var(--red);
}

.bar {
    max-width: 52rem;
    margin: 0 auto;
    padding: 0.85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.bar a {
    color: var(--ink);
    text-decoration: none;
}

nav a {
    margin-left: 1rem;
    color: var(--muted);
}

nav a:hover { color: var(--ink); }

.logo { font-weight: 650; letter-spacing: -0.01em; }
.logo span { color: var(--red); }

main {
    max-width: 52rem;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 2.5rem;
}

footer {
    max-width: 52rem;
    margin: 0 auto;
    padding: 0 1.25rem 2rem;
    color: var(--muted);
    font-size: 0.9rem;
}

h1 {
    font-size: 1.6rem;
    font-weight: 650;
    letter-spacing: -0.02em;
    margin: 0.15rem 0 0.8rem;
}

h2 {
    font-size: 1.05rem;
    font-weight: 650;
    margin: 1.4rem 0 0.4rem;
}

main a { color: var(--red); }
main a:hover { text-decoration: none; }

.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 1rem 1.1rem;
    margin: 0.8rem 0;
}

.prompt { white-space: pre-wrap; }

label {
    display: block;
    margin: 1rem 0 0.35rem;
    font-size: 0.92rem;
    color: var(--muted);
}

input[type=text], input[type=password], textarea {
    width: 100%;
    font: 14px/1.45 ui-monospace, monospace;
    padding: 0.65rem 0.75rem;
    border: 1px solid #d5d5d5;
    border-radius: 8px;
    background: #fff;
    color: var(--ink);
}

textarea {
    min-height: 70vh;
    background: #fafafa;
}

input:focus, textarea:focus {
    outline: 2px solid var(--red);
    outline-offset: 1px;
    border-color: transparent;
}

button {
    background: var(--red);
    color: #fff;
    border: 0;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font: 600 0.95rem system-ui, sans-serif;
    cursor: pointer;
    margin-top: 0.75rem;
}

button:hover { background: #9d2630; }

.ok, .bad {
    border-radius: 8px;
    padding: 0.7rem 0.85rem;
    white-space: pre-wrap;
    margin: 0.8rem 0;
}

.ok { background: #eef7f0; border: 1px solid #b7dfc2; }
.bad { background: #fdf2f2; border: 1px solid #f0c2c5; }

.pass, .miss {
    display: inline-block;
    margin-left: 0.4rem;
    padding: 0.05rem 0.45rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.pass { color: var(--green); background: #e7f6ec; }
.miss { color: var(--muted); background: #eee; }

table {
    border-collapse: collapse;
    width: 100%;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
}

th, td {
    border-bottom: 1px solid var(--line);
    padding: 0.45rem 0.6rem;
    text-align: left;
}

th { font-size: 0.85rem; color: var(--muted); font-weight: 600; }

code, pre { font-family: ui-monospace, monospace; }

pre {
    background: #fafafa;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.8rem;
    overflow: auto;
}

.error { color: var(--red); }

form.card { max-width: 24rem; }