/* ==========================================
   通用导航样式 - Universal Navigation Styles
   ========================================== */

/* 顶部通栏 - Top Bar */
.top-bar {
    background: #f8f9fa;
    padding: 6px 0;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 1001;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.top-bar .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    font-size: 11px;
    color: #64748b;
}

.top-bar-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 2px 8px;
    transition: color 0.3s ease;
}

.top-bar-item:hover {
    color: #0ABAB5;
}

.top-bar-item i {
    color: #0ABAB5;
    font-size: 11px;
}

/* Header & Navigation */
.header {
    background: #f8f9fa !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 30px;
    z-index: 1000;
    border-bottom: 1px solid #e5e7eb;
    transition: all 0.3s ease;
    height: 65px;
    display: flex;
    align-items: center;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: 100%;
}

/* Logo */
.logo {
    font-size: 28px;
    font-weight: bold;
    color: #0ABAB5;
    text-decoration: none;
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
    transition: color 0.3s ease;
}

.logo:hover {
    color: #098F6D;
}

.logo img {
    height: 45px;
    width: auto;
}

/* 导航菜单 */
.nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav a {
    color: #1e293b !important;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
    padding: 6px 12px;
    white-space: nowrap;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: #0ABAB5;
    transition: width 0.3s ease;
}

.nav a:hover {
    color: #0ABAB5;
}

.nav a:hover::after {
    width: 80%;
}

/* 下拉菜单 */
.nav .dropdown {
    position: relative;
}

.nav .dropdown-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 6px 12px;
    transition: color 0.3s ease;
    color: #1e293b !important;
    font-size: 14px;
    white-space: nowrap;
    text-decoration: none;
}

.nav .dropdown-btn i {
    transition: transform 0.3s ease;
}

.nav .dropdown:hover .dropdown-btn {
    color: #0ABAB5;
}

.nav .dropdown:hover .dropdown-btn i {
    transform: rotate(180deg);
}

.nav .dropdown-content {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    background: white;
    min-width: 220px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-radius: 12px;
    padding: 12px 0;
    display: none;
    border: 1px solid #e5e7eb;
    z-index: 9999;
}

.nav .dropdown:hover .dropdown-content {
    display: block;
}

.nav .dropdown-content a {
    display: block;
    padding: 10px 20px;
    color: #1e293b !important;
    font-size: 14px;
    font-weight: 500;
    margin: 0;
    position: relative;
}

.nav .dropdown-content a::after {
    display: none;
}

.nav .dropdown-content a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 0;
    background: #0ABAB5;
    transition: height 0.3s ease;
}

.nav .dropdown-content a:hover {
    background: rgba(10, 186, 181, 0.08);
    color: #0ABAB5 !important;
}

.nav .dropdown-content a:hover::before {
    height: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: #1e293b;
    cursor: pointer;
    padding: 8px;
    z-index: 10000;
}

/* ==========================================
   响应式设计 - Responsive Design
   ========================================== */

/* 平板端 */
@media (max-width: 1024px) {
    .header .container {
        padding: 0 15px;
    }
    
    .nav {
        gap: 15px;
    }
    
    .nav a {
        padding: 6px 10px;
        font-size: 13px;
    }
    
    .nav .dropdown-btn {
        padding: 6px 10px;
        font-size: 13px;
    }
}

/* 手机端 */
@media (max-width: 768px) {
    .top-bar .container {
        flex-direction: column;
        gap: 8px;
        font-size: 10px;
        padding: 4px 10px;
    }
    
    .top-bar {
        padding: 4px 0;
    }
    
    .header {
        top: 60px;
        height: 60px;
    }
    
    .header .container {
        padding: 0 10px;
    }
    
    .logo img {
        height: 35px !important;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.95);
        flex-direction: column;
        padding: 80px 20px 20px;
        z-index: 9999;
        overflow-y: auto;
        gap: 0;
    }
    
    .nav.active {
        display: flex;
    }
    
    .nav a,
    .nav .dropdown-btn {
        color: white !important;
        padding: 15px 20px;
        font-size: 16px;
        width: 100%;
        text-align: left;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .nav .dropdown {
        width: 100%;
    }
    
    .nav .dropdown-content {
        position: static;
        background: rgba(255,255,255,0.05);
        border: none;
        box-shadow: none;
        padding: 10px 0;
        margin: 0;
        display: none;
        min-width: auto;
    }
    
    .nav .dropdown.active .dropdown-content {
        display: block;
    }
    
    .nav .dropdown-content a {
        color: rgba(255,255,255,0.8) !important;
        padding: 10px 20px 10px 30px;
        font-size: 14px;
    }
    
    .nav .dropdown-content a:hover {
        color: white !important;
        background: rgba(255,255,255,0.1);
    }
}

@media (max-width: 480px) {
    .top-bar-item {
        font-size: 9px;
        padding: 1px 4px;
        gap: 4px;
    }
    
    .top-bar-item i {
        font-size: 9px;
    }
    
    .logo img {
        height: 30px !important;
    }
}