:root {
    --bg: #f6f4ef;
    --paper: #fcfbf8;
    --ink: #1b1f23;
    --muted: #5a626b;
    --line: #d8d3c7;
    --accent: #2f4f4f;
    --accent-soft: #e7efef;
    --maxw: 980px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Source Serif 4", "Georgia", serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 10% 10%, rgba(47, 79, 79, 0.08), transparent 35%),
        radial-gradient(circle at 90% 0%, rgba(90, 98, 107, 0.08), transparent 28%),
        var(--bg);
    line-height: 1.7;
}

.site-header {
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, var(--paper), rgba(252, 251, 248, 0.85));
    position: sticky;
    top: 0;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    z-index: 10;
}

.header-inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0.9rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.brand {
    font-family: "Cormorant Garamond", "Times New Roman", serif;
    font-size: 1.35rem;
    letter-spacing: 0.02em;
    margin: 0;
}

.top-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.top-nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.2rem 0.35rem;
    border-radius: 4px;
}

.top-nav a:hover,
.top-nav a:focus-visible {
    color: var(--accent);
    background: var(--accent-soft);
    outline: none;
}

main {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 1.4rem 1rem 3rem;
}

.hero {
    border: 1px solid var(--line);
    background: var(--paper);
    padding: 1.4rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    animation: fade-in 450ms ease-out;
}

.hero h2 {
    margin: 0 0 0.5rem;
    font-family: "Cormorant Garamond", "Times New Roman", serif;
    font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.hero p {
    margin: 0;
    color: var(--muted);
}

.content-panel {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 1.2rem;
    animation: rise-in 520ms ease-out;
}

.content-panel h3,
.content-panel h4,
.content-panel h5 {
    font-family: "Cormorant Garamond", "Times New Roman", serif;
    margin-top: 1.5rem;
    margin-bottom: 0.45rem;
}

.content-panel h3 {
    margin-top: 0;
    font-size: 1.5rem;
}

.content-panel p {
    margin-top: 0;
    margin-bottom: 1rem;
    text-align: justify;
}

.suggestion-note {
    background: #fffbe6;
    border-left: 3px solid #c9a227;
    padding: 0.55rem 0.9rem;
    font-size: 0.92rem;
    color: #5a4a00;
    margin-bottom: 1rem;
    text-align: left;
}

.quick-links {
    margin: 1.4rem 0;
    padding: 1rem;
    border-left: 4px solid var(--accent);
    background: var(--accent-soft);
}

.quick-links h4 {
    margin-top: 0;
}

.quick-links ul {
    margin: 0;
    padding-left: 1.1rem;
}

.quick-links a {
    color: var(--accent);
}

.site-footer {
    border-top: 1px solid var(--line);
    color: var(--muted);
    padding: 1.1rem 1rem 2rem;
    max-width: var(--maxw);
    margin: 0 auto;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper);
    padding: 1rem;
}

.card h4 {
    margin-top: 0;
}

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.method-steps {
    padding-left: 1.2rem;
    margin-bottom: 1rem;
}

.method-steps li {
    margin-bottom: 0.55rem;
}

.method-steps li::marker {
    color: var(--accent);
    font-weight: 600;
}

.standards-list {
    padding-left: 1.2rem;
    margin-bottom: 1rem;
}

.standards-list li {
    margin-bottom: 0.4rem;
}

.principle-note {
    border-left: 3px solid var(--accent);
    padding-left: 0.9rem;
    color: var(--muted);
    font-style: italic;
}

@media (max-width: 700px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero,
    .content-panel {
        padding: 1rem;
    }
}