/* ============================================
   共用導航列與頁首 (Header & Navigation)
   五個頁面共用：桌機橫向導覽 + 手機漢堡選單
   ============================================ */

/* ============================================
   撠舘⏛??- 1920px ?箸?
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(rgba(7, 41, 50, 0));
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1920px;
    margin: 0 auto;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--nav-padding);
}

.logo-link {
    display: block;
}

.logo {
    height: var(--logo-height);
    width: auto;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links li {
    list-style: none;
}

.nav-links a {
    font-size: 16px;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
    text-decoration: none;
    color: var(--text-white);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width var(--transition-normal);
}

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

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-teal);
}

/* 漢堡選單按鈕 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 32px;
    height: 32px;
    padding: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background-color: var(--text-white);
    border-radius: 2px;
    transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 手機版選單面板 */
.mobile-menu {
    display: none;
    background-color: rgba(6, 22, 26, 0.98);
    padding: var(--spacing-lg);
}

.mobile-menu.active {
    display: block;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    list-style: none;
}

.mobile-nav-links li {
    list-style: none;
}

.mobile-nav-links a {
    display: block;
    padding: var(--spacing-md);
    font-size: var(--font-lg);
    font-weight: 500;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color var(--transition-fast);
    text-decoration: none;
    color: var(--text-white);
}

.mobile-nav-links a:hover,
.mobile-nav-links a.active {
    background-color: rgba(31, 200, 171, 0.1);
    color: var(--primary-teal);
}

/* ============================================
   ?踵?撘讛身閮?- 1440px
   ============================================ */
@media (max-width: 1440px) {
    .nav-links {
        gap: 28px;
    }
    .nav-links a {
        font-size: 16px;
    }
}

/* ============================================
   ?踵?撘讛身閮?- 1200px
   ============================================ */
@media (max-width: 1200px) {
    .nav-links {
        gap: 24px;
    }
    .nav-links a {
        font-size: 14px;
    }
}

/* ============================================
   ?踵?撘讛身閮?- 1080px
   ============================================ */
@media (max-width: 1080px) {
    .nav-links {
        gap: 20px;
    }
    .nav-links a {
        font-size: 14px;
    }
}

/* ============================================
   ?踵?撘讛身閮?- 960px
   ============================================ */
@media (max-width: 960px) {
    .nav-links {
        gap: 16px;
    }
    .nav-links a {
        font-size: 12px;
    }
}

/* ============================================
   ?踵?撘讛身閮?- 768px (撟單踎/?𧢲??擧腹)
   ============================================ */
@media (max-width: 768px) {

    /* 導航列 - 手機版 */
    .nav-container {
        padding: 0 16px;
    }

    .logo {
        height: 28px;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }
}