/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    background: var(--white);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    gap: 1rem;
}

.navbar.scrolled {
    padding: 1rem 5%;
}

.navbar-logo {
    flex: 0 0 auto;
    min-width: 0;
    overflow: hidden;
}

.logo-img {
    height: 40px;
    width: auto;
    transition: transform 0.3s ease;
}

.logo-img:hover {
    transform: scale(1.05);
}

.navbar-brand {
    font-family: var(--font-heading);
    font-size: clamp(1rem, 2.5vw, 1.8rem);
    font-weight: 700;
    color: #000000;
    text-decoration: none;
    transition: color 0.3s ease;
    margin-right: auto;
    flex-shrink: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    color: #6b7280;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

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

/* 导航链接激活状态 */
.nav-links a.active {
    color: var(--secondary-color) !important;
}

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

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1002;
    flex-shrink: 0;
    margin-left: auto;
}

.nav-toggle-bar {
    width: 24px;
    height: 3px;
    background: #374151;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.nav-toggle.active .nav-toggle-bar:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .nav-toggle-bar:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 移动端菜单遮罩 */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 移动端菜单 */
.mobile-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100%;
    background: var(--white);
    z-index: 1001;
    padding: 5rem 2rem 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
}

.mobile-nav.active {
    transform: translateX(0);
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-nav-links a {
    color: #374151;
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
    display: block;
}

.mobile-nav-links a.active {
    color: var(--secondary-color);
}