/* 햄버거 버튼 */
.hamburger-btn {
    display: none;
    position: absolute;
    top: 5px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: none;
    border: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 10002; /* 오버레이(close-btn) 보다 위 */
    padding: 8px;
}


.hamburger-btn:focus {
    outline: 2px solid #764ba2;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
}
.hamburger-btn span {
    display: block;
    width: 28px;
    height: 3px;
    margin: 3px 0;
    background: #764ba2;
    border-radius: 2px;
    transition: all 0.3s;
}

/* 햄버거 -> X 아이콘 전환 */
.hamburger-btn.open span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}
.hamburger-btn.open span:nth-child(2) {
  opacity: 0;
}
.hamburger-btn.open span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* 오버레이 네비게이션 */
.nav-overlay {
    display: none;
    position: fixed;
    z-index: 10000;
    top: 0; left: 0; right: 0; bottom: 0;
    background: #fff;
    transition: opacity 0.3s;
    opacity: 0;
    pointer-events: none;
}
.nav-overlay.open {
    display: block;
    opacity: 1;
    pointer-events: auto;
}
.nav-overlay-content {
    position: absolute;
    top: 0; left: 0; right: 0;
    padding: 40px 0 0 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}
.close-btn {
    position: absolute;
    top: 18px;
    right: 24px;
    background: none;
    border: none;
    font-size: 2.2em;
    color: #fff;
    cursor: pointer;
    z-index: 10001;
}
/* 햄버거 버튼이 항상 오버레이 위에 있도록 z-index 조정 */
.nav-overlay.open ~ .hamburger-btn,
.hamburger-btn.open {
    z-index: 10002;
}

.nav-list {
    margin-top: 48px;
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.nav-list .nav-tab {
    background: #fff;
    color: #764ba2;
    border-radius: 12px;
    font-size: 1.2em;
    font-weight: 600;
    padding: 20px 0;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0,0,0,0.09);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.nav-list .nav-tab:hover {
    background: #ece7fa;
    color: #5a3578;
}

.nav-tabs {
    margin-bottom: 0;
    margin-top: 18px;
    /* width: 100%; */
    display: flex;
    justify-content: center;
    gap: 12px;
    background: none;
    box-shadow: none;
}

.nav-tabs {
    display: flex;
    background: white;
    border-radius: 15px;
    padding: 5px;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    overflow-x: auto;
}
.nav-tab {
    flex: 1;
    padding: 15px 20px;
    text-align: center;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    white-space: nowrap;
    min-width: 120px;
}
.nav-tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}
.nav-tab:hover {
    background: #f7fafc;
}
.nav-tab.active:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* 반응형: 모바일에서 nav-tabs 숨기고 햄버거 노출 */
@media (max-width: 900px) {
    .header-content .nav-tabs {
        display: none !important;
    }
    .hamburger-btn {
        display: flex;
    }
    .container {
        padding: 200px 10px 10px 10px;
    }
}
@media (min-width: 901px) {
    .nav-overlay {
        display: none !important;
    }
    .hamburger-btn {
        display: none !important;
    }
}


@media (max-width: 768px) {
    .container {
        padding: 200px 10px 10px 10px;
    }
    .nav-tabs {
        flex-direction: column;
    }
    .nav-tab {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .hamburger-btn {
      width: 28px;
      height: 28px;
      padding: 1.5px;
      top: 2px;
      right: 8px;
    }
    .hamburger-btn span {
      height: 3px !important;
      margin: 4px 0 !important;
    }
}