/* ── Design Tokens ── */
:root {
    --bg: #ffffff;
    --surface: #f7f9fc;
    --fg: #333333;
    --fg-2: #555555;
    --muted: #888888;
    --meta: #aaaaaa;
    --primary: #1a3a6b;
    --primary-dark: #0f2444;
    --primary-light: #f0f3f8;
    --border: #e8e8e8;
    --border-soft: #f0f0f0;
    --font: 'Noto Sans KR', sans-serif;
    --radius-sm: 4px;
    --radius-md: 8px;
    --ease: ease;
    --dur: 200ms;
}

/* ── Reset ── */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font); background: var(--bg); color: var(--fg); line-height: 1.6; }
a { text-decoration: none; color: inherit; }

/* ── Header ── */
header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}
.header-inner {
    max-width: 1200px; margin: 0 auto; padding: 0 20px;
    display: flex; align-items: center; justify-content: space-between; height: 72px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; }
.logo-icon img { width: 100%; height: 100%; object-fit: contain; }
.logo-text .name { font-size: 1.25rem; font-weight: 700; color: var(--primary); letter-spacing: -0.5px; }
.logo-text .sub { font-size: 0.7rem; color: #888; letter-spacing: 1px; }

/* ── Nav ── */
nav ul { list-style: none; display: flex; }
nav > ul > li { position: relative; }
nav > ul > li > a {
    display: flex; align-items: center; padding: 0 18px; height: 40px;
    margin: 16px 4px; border-radius: 20px; font-size: 0.92rem; font-weight: 500;
    color: #444; background: var(--primary-light);
    transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
    white-space: nowrap;
}
nav > ul > li:hover > a,
nav > ul > li.active > a { background: var(--primary); color: #fff; }

.dropdown {
    display: none; position: absolute; top: 72px; left: 0;
    background: #fff; border-top: 2px solid var(--primary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12); min-width: 160px; z-index: 999;
}
nav > ul > li:hover .dropdown { display: block; }
.dropdown li a {
    display: block; padding: 11px 20px; font-size: 0.88rem;
    color: #444; border-bottom: 1px solid var(--border-soft);
    transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
    white-space: nowrap;
}
.dropdown li:last-child a { border-bottom: none; }
.dropdown li a:hover,
.dropdown li a.active { background: #f4f7fb; color: var(--primary); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: #333; transition: all 0.3s; }

/* ── Utility ── */
.section { padding: 70px 0; }
.inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ── Buttons ── */
.btn-primary {
    display: inline-flex; align-items: center;
    padding: 12px 28px; background: var(--primary); color: #fff;
    border-radius: var(--radius-sm); font-size: 15px; font-weight: 600;
    transition: background var(--dur) var(--ease);
}
.btn-primary:hover { background: #0f2a5a; }

.btn-ghost {
    display: inline-flex; align-items: center;
    padding: 11px 28px; background: transparent; color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.5); border-radius: var(--radius-sm);
    font-size: 15px; font-weight: 500;
    transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, 0.1); }

/* ── Footer ── */
footer { background: var(--primary-dark); color: #8899bb; padding: 48px 0 28px; }
.footer-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.footer-top {
    display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 40px;
    padding-bottom: 32px; border-bottom: 1px solid #1e3560;
}
.footer-logo .name {
    font-size: 1.2rem; font-weight: 700; color: white; margin-bottom: 10px;
    display: flex; align-items: center; gap: 8px;
}
.footer-logo .name img { width: 22px; height: 22px; object-fit: contain; }
.footer-logo p { font-size: 0.83rem; line-height: 1.9; }
.footer-col h4 { color: #aabbd4; font-size: 0.82rem; letter-spacing: 1px; margin-bottom: 14px; font-weight: 500; }
.footer-col ul { list-style: none; }
.footer-col ul li { font-size: 0.83rem; padding: 4px 0; }
.footer-col ul li a { color: #8899bb; transition: color var(--dur) var(--ease); }
.footer-col ul li a:hover { color: #ddeeff; }
.footer-bottom {
    padding-top: 20px; display: flex; justify-content: space-between;
    align-items: center; font-size: 0.78rem;
}

/* ── Responsive ── */
@media (max-width: 900px) {
    nav { display: none; }
    nav.open {
        display: block; position: absolute; top: 72px; left: 0; right: 0;
        background: white; box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    }
    nav.open ul { flex-direction: column; }
    nav.open > ul > li > a {
        height: auto; padding: 14px 20px; border-bottom: 1px solid var(--border-soft);
        border-radius: 0; margin: 0; background: transparent; color: var(--fg);
    }
    nav.open > ul > li:hover > a,
    nav.open > ul > li.active > a { background: var(--primary-light); color: var(--primary); }
    nav.open .dropdown {
        display: block; position: static; border: none; box-shadow: none;
        background: var(--surface);
    }
    nav.open .dropdown li a { padding-left: 36px; }
    .menu-toggle { display: flex; }
    .footer-top { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}