/* ==========================================================
   layout.css - 레이아웃
   기본:      header(상단) → .layout(내용) → footer(하단)
   옵션:      .layout.has-sidebar → 좌측 사이드바 + 우측 콘텐츠 2단
   ========================================================== */

/* ===== 상단 (메뉴) ===== */
.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    gap: 28px;
}
.logo {
    font-size: 20px;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.03em;
}
.top-menu { display: flex; gap: 22px; }
.top-menu a {
    color: var(--muted);
    font-weight: 500;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: color .15s, border-color .15s;
}
.top-menu a:hover { color: var(--text); border-color: var(--accent); }

/* ===== 본문 레이아웃 (기본: 콘텐츠만) ===== */
.layout {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 24px 20px;
    min-height: calc(100vh - 60px - 130px);
}

/* ===== 옵션: 좌측 사이드바 2단 (.has-sidebar) ===== */
.layout.has-sidebar {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 24px;
}

/* ===== 좌측 (서브메뉴) — has-sidebar 일 때만 사용 ===== */
.sidebar {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    height: fit-content;
    position: sticky;
    top: 84px;
}
.sidebar-title {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: .12em;
    margin-bottom: 12px;
}
.sub-menu { display: flex; flex-direction: column; gap: 2px; }
.sub-menu a {
    padding: 9px 12px;
    border-radius: 8px;
    color: var(--text);
    font-weight: 500;
    transition: background .15s, color .15s;
}
.sub-menu a:hover,
.sub-menu a.on { background: var(--accent-soft); color: var(--accent); }

/* ===== 우측 (콘텐츠) ===== */
.content {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 32px;
}

/* ===== 하단 (copyright) ===== */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--line);
    margin-top: 24px;
}
.footer-inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 24px 20px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--muted);
    font-size: 13px;
}

/* ===== 반응형 ===== */
@media (max-width: 768px) {
    .layout.has-sidebar { grid-template-columns: 1fr; }
    .sidebar { position: static; }
    .header-inner { gap: 16px; }
    .top-menu { gap: 14px; font-size: 14px; }
    .content { padding: 22px; }
}