:root {
    --bg: #f0f4f8;
    --card: #ffffff;
    --text: #1f2933;
    --muted: #52606d;
    --accent: #2a6ebb;
    --accent-dark: #1c3f60;
    --accent-soft: #78a3cf;
    --gold: #f1b24a;
    --border: rgba(42, 110, 187, 0.18);
    --shadow: rgba(0, 0, 0, 0.10);
    --soft: #f7fbff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    background: radial-gradient(circle at top, #ffffff 0, var(--bg) 42%, #e8eef5 100%);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    margin: 0;
    color: var(--text);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 28px 18px;
}

.wrapper {
    width: 100%;
    max-width: 980px;
}

.header-card, .content-card {
    width: 100%;
    background-color: var(--card);
    box-shadow: 0 4px 12px var(--shadow);
    border-radius: 14px;
    border: 1px solid var(--border);
    margin-bottom: 24px;
}

.header-card {
    padding: 34px 32px 28px 32px;
    border-top: 6px solid var(--gold);
}

.content-card {
    padding: 30px 32px;
}

.eyebrow {
    margin: 0 0 10px 0;
    color: var(--accent-dark);
    font-size: 0.92rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

h1 {
    margin: 0 0 12px 0;
    color: var(--accent);
    font-size: clamp(2.05rem, 5vw, 3.4rem);
    line-height: 1.05;
}

h2 {
    margin: 0 0 16px 0;
    color: var(--accent-dark);
    font-size: clamp(1.4rem, 3vw, 2rem);
    line-height: 1.2;
}

h3 {
    margin: 0 0 8px 0;
    color: var(--accent-dark);
    font-size: 1.07rem;
}

.subtitle {
    margin: 0 0 22px 0;
    color: var(--accent-dark);
    font-size: 1.25rem;
    font-weight: 700;
}

.claim {
    margin: 0 auto 26px auto;
    padding: 18px 20px;
    max-width: 760px;
    background-color: var(--soft);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--accent-dark);
    font-size: 1.16rem;
    font-weight: 700;
    line-height: 1.45;
}

p {
    font-size: 1.05rem;
    line-height: 1.62;
    margin: 0 0 18px 0;
}

.intro {
    max-width: 760px;
    margin: 0 auto 24px auto;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 22px 0 0 0;
}

.nav a, .button-link {
    display: inline-block;
    padding: 10px 15px;
    border-radius: 999px;
    background: #e8edf2;
    color: var(--accent-dark);
    font-size: 0.94rem;
    font-weight: 700;
    text-decoration: none;
    border: 1px solid var(--border);
}

.nav a:hover, .button-link:hover {
    background: var(--soft);
    text-decoration: none;
}

.grid-2, .grid-3 {
    display: grid;
    gap: 14px;
    margin: 18px 0 10px 0;
    text-align: left;
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.topic, .principle, .source-box {
    padding: 19px 18px;
    border-radius: 11px;
    background-color: var(--soft);
    border: 1px solid var(--border);
}

.principle {
    background-color: #ffffff;
    box-shadow: 0 2px 7px rgba(0, 0, 0, 0.04);
}

.topic strong, .principle strong, .source-box strong {
    display: block;
    color: var(--accent-dark);
    margin-bottom: 8px;
    font-size: 1.02rem;
}

.topic span, .principle span, .source-box span {
    display: block;
    color: var(--muted);
    font-size: 0.98rem;
    line-height: 1.55;
}

.principles {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 16px 0 26px 0;
    text-align: left;
}

.notice {
    margin: 24px auto 0 auto;
    padding: 17px 20px;
    background-color: var(--soft);
    border: 1px solid var(--border);
    border-left: 5px solid var(--gold);
    border-radius: 10px;
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.55;
    text-align: left;
}

.small {
    color: var(--muted);
    font-size: 0.92rem;
}

footer {
    font-size: 0.86rem;
    color: #333;
    text-align: center;
    padding: 10px 20px;
    max-width: 900px;
    line-height: 1.45;
}

footer a, .source-list a {
    color: #0066cc;
    text-decoration: none;
    font-weight: 600;
}

footer a:hover, .source-list a:hover { text-decoration: underline; }

.source-list {
    text-align: left;
    margin: 10px 0 0 0;
    padding-left: 1.1rem;
    color: var(--muted);
}

.source-list li { margin-bottom: 7px; }

@media (max-width: 820px) {
    body { padding: 18px 12px; }
    .header-card, .content-card { padding: 25px 20px; }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .nav { justify-content: center; }
}