/* 导航样式 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    padding: 10px 0;
}

.header-top {
    background: var(--bg-dark);
    color: white;
    padding: 8px 0;
    font-size: 13px;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-top a {
    color: rgba(255,255,255,0.8);
}

.header-top a:hover {
    color: white;
}

.header-main {
    padding: 15px 0;
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo span {
    color: var(--secondary-color);
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 10px 18px;
    color: var(--text-color);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background: var(--bg-light);
    color: var(--primary-color);
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    padding: 8px 0;
}

.nav-item:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-link {
    display: block;
    padding: 10px 20px;
    color: var(--text-color);
    font-size: 14px;
    transition: var(--transition);
}

.nav-dropdown-link:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.nav-dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 8px 0;
}

.nav-dropdown-link.text-primary {
    color: var(--primary-color);
    font-weight: 500;
}

.nav-dropdown-link.text-primary:hover {
    background: var(--bg-light);
    color: var(--primary-dark);
}

/* 图标间距 */
.nav-link .mr-1 { margin-right: 4px; }
.nav-link .ml-1 { margin-left: 4px; }

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-color);
    margin: 5px 0;
    transition: var(--transition);
}

/* Hero Banner */
.hero {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: white;
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="30" cy="40" r="1.5" fill="rgba(255,255,255,0.15)"/><circle cx="70" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="90" cy="70" r="1.5" fill="rgba(255,255,255,0.15)"/></svg>');
    opacity: 0.5;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

/* 区块标题 */
.section {
    padding: 80px 0;
}

.section-gray {
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 15px;
}

.section-title span {
    color: var(--primary-color);
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-light);
}

/* 网格布局 */
.grid {
    display: grid;
    gap: 30px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 18px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(30, 136, 229, 0.4);
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.5);
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    color: #1e293b;
    padding: 60px 0 20px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231e293b' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    position: relative;
    z-index: 1;
}

.footer-brand {
    padding-right: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 20px;
}

.footer-logo i {
    color: #1e88e5;
}

.footer-description {
    color: #64748b;
    line-height: 1.8;
    margin-bottom: 25px;
    font-size: 14px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(30, 136, 229, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
    font-size: 16px;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: linear-gradient(135deg, #1e88e5, #64b5f6);
    color: white;
    transform: translateY(-3px);
}

.footer-columns {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.footer-column {
    padding: 0 10px;
}

.footer-title {
    font-size: 15px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: linear-gradient(90deg, #1e88e5, #64b5f6);
    border-radius: 1px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #64748b;
    font-size: 14px;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: #1e88e5;
    padding-left: 5px;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #64748b;
    font-size: 14px;
}

.contact-item i {
    width: 20px;
    color: #1e88e5;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 25px;
    margin-top: 20px;
    position: relative;
    z-index: 1;
    border-top: 1px solid #e2e8f0;
}

.footer-copyright p {
    color: #94a3b8;
    font-size: 13px;
}

.footer-terms {
    display: flex;
    gap: 25px;
}

.footer-terms a {
    color: #94a3b8;
    font-size: 13px;
    transition: all 0.3s ease;
}

.footer-terms a:hover {
    color: #1e88e5;
}

/* 面包屑 */
.breadcrumb {
    background: var(--bg-light);
    padding: 20px 0;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 10px;
    list-style: none;
    font-size: 14px;
}

.breadcrumb-list a {
    color: var(--text-light);
}

.breadcrumb-list a:hover {
    color: var(--primary-color);
}

.breadcrumb-list .current {
    color: var(--text-color);
    font-weight: 500;
}

/* 响应式 */
@media (max-width: 992px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav { display: none; }
    .mobile-menu-btn { display: block; }
    .hero { padding: 60px 0; }
    .hero-title { font-size: 32px; }
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .section { padding: 50px 0; }
}