/* ===== 헤더 공통 ===== */
.site-header {
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: transform 0.3s ease;
}

.header-container {
    display: grid;
    grid-template-columns: auto auto 1fr;
    align-items: center;
    gap: 0 16px;
    padding: 0;
    min-height: 80px;
    max-width: 1200px;
    margin: 0 auto;
}

.header-col {
    display: flex;
    align-items: center;
}

.header-col-left {
    justify-content: flex-start;
}

.header-col-center {
    justify-content: flex-start;
    gap: 0;
}

.header-col-right {
    justify-content: flex-end;
    gap: 8px;
}

.header-logo {
    display: flex;
    align-items: center;
}

.header-logo img {
    width: 80px;
    height: 80px;
    display: block;
    object-fit: contain;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #1a1a1a;
    transition: color 0.2s ease;
    white-space: nowrap;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background: #007bff;
    transition: width 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #007bff;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.btn-header {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
}

.btn-login {
    background: transparent;
    color: #333;
    border: none;
}

.btn-login:hover {
    background: #f8f9fa;
}

.btn-signup {
    background: #007bff;
    color: #fff;
    border: none;
    padding: 8px 14px;
}

.btn-signup:hover {
    background: #0056b3;
}

.header-mobile-toggle {
    display: none;
    font-size: 24px;
    padding: 8px;
    color: #333;
}

.header-mobile-toggle:hover {
    color: #007bff;
}

.header-mobile-toggle i {
    display: block;
}