:root {
    --bg-dark: #07111f;
    --bg-mid: #0d2a4b;
    --bg-soft: #123f70;
    --card-bg: #0b1f37;
    --card-border: #2a5f94;
    --text-main: #e8f2ff;
    --text-muted: #bdd6f5;
    --accent: #4da3ff;
    --accent-strong: #2b7de9;
    --success: #67d69a;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-main);
    line-height: 1.7;
    background: linear-gradient(145deg, var(--bg-dark) 0%, var(--bg-mid) 50%, var(--bg-soft) 100%);
}

.card {
    width: min(820px, 100%);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 18px;
    padding: 30px;
    box-shadow: 0 14px 36px rgba(4, 12, 24, 0.55);
    backdrop-filter: blur(3px);
}

h1 {
    margin-top: 0;
    margin-bottom: 12px;
    font-size: clamp(1.9rem, 3vw, 2.5rem);
    color: var(--accent);
    letter-spacing: 0.6px;
    text-transform: uppercase;
}

h2 {
    margin-top: 24px;
    margin-bottom: 10px;
    color: var(--accent);
    font-size: 1.28rem;
    letter-spacing: 0.3px;
}

.tag {
    display: inline-block;
    margin-bottom: 18px;
    padding: 7px 13px;
    border-radius: 999px;
    background: rgba(77, 163, 255, 0.16);
    color: #9acbff;
    border: 1px solid rgba(77, 163, 255, 0.45);
    font-weight: 700;
    font-size: 0.92rem;
}

p {
    margin: 0 0 14px;
    font-size: 1.05rem;
    color: var(--text-muted);
}

.highlight {
    color: var(--text-main);
    font-weight: 700;
}

.good {
    color: var(--success);
    font-weight: 700;
}

ol {
    margin: 0;
    padding-left: 1.3rem;
}

ol li {
    margin-bottom: 6px;
    color: var(--text-muted);
}

a {
    color: #8ec5ff;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover,
a:focus-visible {
    color: #c6e2ff;
    border-bottom-color: var(--accent-strong);
}