/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, rgba(10, 20, 40, 0.95) 0%, rgba(15, 30, 60, 0.95) 100%);
    color: white;
    padding: 0.875rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.4s ease;
    will-change: transform;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.navbar.hidden {
    transform: translateY(-100%);
    pointer-events: none;
}

.navbar.show {
    transform: translateY(0);
    pointer-events: auto;
}

.navbar a {
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: #ffffff;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #5b9bd5;
}

/* 右侧导航区域 */
.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-links-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-links-container:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    border-color: rgba(255, 255, 255, 0.15);
}

.nav-links-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06), transparent);
    transition: left 0.6s ease;
}

.nav-links-container:hover::before {
    left: 100%;
}

.mini-nav {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.mini-nav:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateY(-1px);
}

.mini-nav:active {
    transform: translateY(0) scale(0.98);
}

/* 语言下拉菜单 */
.language-dropdown {
    position: relative;
    display: inline-block;
}

.language-dropdown-btn {
    background: rgba(255, 255, 255, 0.08);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.language-dropdown-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    border-color: rgba(255, 255, 255, 0.15);
}

.language-dropdown-btn:active {
    transform: translateY(0) scale(0.98);
}

.language-dropdown-content {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: rgba(10, 20, 40, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 16px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1001;
    min-width: 140px;
    overflow: hidden;
    transform-origin: top right;
}

.language-dropdown.active .language-dropdown-content {
    display: block;
    animation: dropdownSlideIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.lang-option {
    display: block;
    padding: 0.75rem 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    position: relative;
    overflow: hidden;
    font-weight: 500;
    font-size: 0.875rem;
}

.lang-option:last-child {
    border-bottom: none;
}

.lang-option:hover {
    background: rgba(255, 255, 255, 0.08);
    color: white;
}

.lang-option.active {
    background: rgba(255, 255, 255, 0.12);
    font-weight: 600;
    color: white;
}

/* 圆形导航按钮 */
.nav-toggle-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    background: rgba(10, 20, 40, 0.9);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1001;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 1;
    transform: scale(1);
    visibility: visible;
}

.nav-toggle-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
    background: linear-gradient(135deg, #1e3a5f 0%, #0f1f3d 100%);
}

.nav-toggle-btn:active {
    transform: scale(0.95);
}

.nav-toggle-btn i {
    color: white;
    font-size: 1.25rem;
    transition: transform 0.3s ease;
}

.nav-toggle-btn:hover i {
    transform: rotate(90deg);
}