:root {
    --primary: #2563eb;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-body: #334155;
    --bg-color: #f8fafc;
}
body {
    font-family: 'Pretendard Variable', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.main-content {
    flex: 1;
    padding-bottom: 40px;
}

/* 하단 Footer 영역 */
.footer { background-color: #0f172a; color: #94a3b8; padding: 50px 24px; margin-top: auto; }
.footer-container { max-width: 1280px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.footer-logo { font-size: 1.5rem; font-weight: 800; color: #ffffff; letter-spacing: -0.03em; margin-bottom: 10px; }
.footer-desc { font-size: 0.95rem; line-height: 1.6; max-width: 600px; }

.footer-contact { margin-top: 15px; font-size: 0.95rem; }
.footer-contact strong { color: #cbd5e1; font-weight: 600; margin-right: 5px; }
.footer-contact a { color: #60a5fa; text-decoration: none; transition: color 0.2s; }
.footer-contact a:hover { color: #93c5fd; text-decoration: underline; }

.footer-divider { height: 1px; background-color: #1e293b; margin: 20px 0; }
.footer-copyright { font-size: 0.85rem; color: #64748b; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 15px; }

/* 탑 버튼 */
.top-btn { position: fixed; bottom: 30px; right: 30px; width: 50px; height: 50px; background-color: var(--primary); color: #fff; border: none; border-radius: 50%; font-size: 1.2rem; font-weight: bold; cursor: pointer; box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3); display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: all 0.3s ease; z-index: 100; }
.top-btn.show { opacity: 1; visibility: visible; }
.top-btn:hover { background-color: #1d4ed8; transform: translateY(-3px); }

@media (max-width: 640px) {
    .footer { padding-bottom: 90px; }
    .top-btn { bottom: 85px; right: 20px; width: 45px; height: 45px; font-size: 1rem; }
}