:root {
    --bg: #ffffff;
    --bg-soft: #f6f8fc;
    --bg-card: #ffffff;
    --text: #0f172a;
    --text-muted: #5b6577;
    --line: #e6ebf2;
    --primary: #4d7cff;
    --primary-deep: #2f5be0;
    --accent: #7c5cff;
    --teal: #34d6c2;
    --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 12px 30px rgba(60, 90, 220, 0.10);
    --radius: 14px;
    --radius-lg: 20px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Noto Sans KR', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }

a { color: var(--primary-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ----- Header ----- */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: saturate(160%) blur(10px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-text { font-size: 20px; letter-spacing: -0.01em; }
.brand-accent { color: var(--primary-deep); font-weight: 700; }

.primary-nav { display: flex; gap: 6px; flex-wrap: wrap; }
.primary-nav a {
    color: var(--text-muted);
    padding: 8px 14px;
    border-radius: 999px;
    font-weight: 500;
    font-size: 14.5px;
    transition: background .15s, color .15s;
}
.primary-nav a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.primary-nav a.active { background: var(--primary); color: #fff; }

/* ----- Hero banner (full-width image) ----- */
.hero-banner {
    width: 100%;
    overflow: hidden;
    background: #1c2746;
    border-bottom: 1px solid var(--line);
}
.hero-banner-img {
    display: block;
    width: 100%;
    height: clamp(280px, 46vw, 560px);
    object-fit: cover;
}

.hero-message {
    text-align: center;
    padding: 56px 0 40px;
    background: #ffffff;
}
.hero-message-title {
    font-size: clamp(22px, 3.4vw, 34px);
    font-weight: 700;
    margin: 0 0 14px;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1.4;
}
.hero-message-sub {
    font-size: 16px;
    color: var(--text-muted);
    margin: 0 0 28px;
}
.cta-row.center { justify-content: center; }

/* ----- Hero (legacy, kept for fallback) ----- */
.hero {
    background: linear-gradient(180deg, #f6f9ff 0%, #ffffff 70%);
    padding: 72px 0 56px;
    border-bottom: 1px solid var(--line);
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: center;
}
.eyebrow {
    display: inline-block;
    background: rgba(77, 124, 255, 0.10);
    color: var(--primary-deep);
    padding: 5px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: 20px;
}
.hero h1 {
    font-size: 48px;
    line-height: 1.18;
    letter-spacing: -0.025em;
    margin: 0 0 18px;
    font-weight: 700;
}
.hero h1 .accent {
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text; background-clip: text;
    color: transparent;
}
.lede { font-size: 18px; color: var(--text-muted); margin: 0 0 28px; max-width: 540px; }

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 22px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform .12s, box-shadow .15s, background .15s, color .15s, border-color .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn.primary {
    background: var(--primary);
    color: #fff;
    box-shadow: var(--shadow-md);
}
.btn.primary:hover { background: var(--primary-deep); }
.btn.ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--line);
}
.btn.ghost:hover { background: var(--bg-soft); }

.hero-art { display: flex; justify-content: center; }
.hero-art svg { width: 100%; max-width: 380px; }

/* ----- Page grid ----- */
.page-grid { padding: 72px 0 96px; background: var(--bg); }
.section-head { text-align: center; margin-bottom: 36px; }
.section-head h2 {
    font-size: 30px;
    margin: 0 0 8px;
    letter-spacing: -0.02em;
}
.muted { color: var(--text-muted); }

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 18px;
}
.card {
    background: var(--bg-card);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    color: var(--text);
    box-shadow: var(--shadow-sm);
    transition: transform .15s, box-shadow .15s, border-color .15s;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.card:hover {
    text-decoration: none;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: rgba(77, 124, 255, 0.4);
}
.card-tag {
    color: var(--primary);
    font-weight: 600;
    font-size: 12.5px;
    letter-spacing: 0.06em;
}
.card h3 {
    font-size: 19px;
    margin: 2px 0 6px;
    line-height: 1.35;
    letter-spacing: -0.01em;
}
.card p {
    color: var(--text-muted);
    margin: 0 0 10px;
    font-size: 14.5px;
    flex: 1;
}
.card-link {
    color: var(--primary-deep);
    font-weight: 600;
    font-size: 14px;
}

.empty {
    text-align: center; padding: 60px 0;
    background: var(--bg-soft);
    border-radius: var(--radius-lg);
}

/* ----- Article (page detail) ----- */
.article { padding: 56px 0 96px; }
.article-narrow { max-width: 760px; }
.breadcrumb {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 18px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb span { margin: 0 6px; }
.article-head h1 {
    font-size: 38px;
    margin: 0 0 10px;
    letter-spacing: -0.02em;
    line-height: 1.25;
}
.article-meta { color: var(--text-muted); font-size: 14.5px; margin: 0 0 32px; }

.article-body {
    font-size: 17px; line-height: 1.85;
}
.article-body h1, .article-body h2, .article-body h3 {
    margin-top: 1.8em; margin-bottom: 0.6em;
    letter-spacing: -0.015em;
}
.article-body h2 { font-size: 24px; }
.article-body h3 { font-size: 19.5px; }
.article-body p { margin: 0 0 1.1em; }
.article-body ul, .article-body ol { padding-left: 1.4em; margin: 0 0 1.1em; }
.article-body li { margin-bottom: 0.4em; }
.article-body blockquote {
    border-left: 3px solid var(--primary);
    margin: 1.4em 0;
    padding: 6px 18px;
    color: var(--text-muted);
    background: var(--bg-soft);
    border-radius: 0 10px 10px 0;
}
.article-body code {
    background: var(--bg-soft);
    padding: 2px 6px;
    border-radius: 6px;
    font-size: 0.92em;
}
.article-body pre {
    background: #0f172a; color: #e6ebf2;
    padding: 16px 18px; border-radius: 12px;
    overflow-x: auto; font-size: 14px;
}
.article-body pre code { background: transparent; padding: 0; }

.article-foot { margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--line); }

.empty-page { text-align: center; padding: 100px 0; }
.empty-page h1 { font-size: 72px; margin: 0; color: var(--primary); }

/* ----- Footer ----- */
.site-footer {
    background: var(--bg-soft);
    border-top: 1px solid var(--line);
    padding: 48px 0 36px;
    color: var(--text-muted);
}
.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 24px;
}
.footer-brand { color: var(--text); font-weight: 700; font-size: 17px; margin-bottom: 6px; }
.footer-tagline { margin: 0; font-size: 14.5px; }
.footer-meta { text-align: right; font-size: 14px; }
.footer-meta p { margin: 0 0 4px; }

/* ----- Responsive ----- */
@media (max-width: 860px) {
    .hero { padding: 48px 0 40px; }
    .hero-grid { grid-template-columns: 1fr; }
    .hero-art { order: -1; }
    .hero-art svg { max-width: 220px; }
    .hero h1 { font-size: 36px; }
    .header-inner { flex-direction: column; height: auto; padding: 12px 0; gap: 8px; }
    .primary-nav { justify-content: center; }
    .footer-inner { grid-template-columns: 1fr; }
    .footer-meta { text-align: left; }
    .article-head h1 { font-size: 28px; }
    .page-grid { padding: 48px 0 72px; }
}