/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #1a1a1a;
    line-height: 1.8;
    background: #fff;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
html {
    scroll-padding-top: 80px;
}

/* 汉堡菜单按钮 - 默认隐藏（移动端显示） */
.menu-toggle {
    display: none;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo-link {
    display: inline-flex;
    text-decoration: none;
    color: inherit;
}

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 16px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.05) 0%, rgba(67, 100, 247, 0.05) 100%);
    transition: all 0.3s ease;
}

.logo:hover {
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.1) 0%, rgba(67, 100, 247, 0.1) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 82, 217, 0.15);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #0052d9 0%, #4364f7 50%, #6fb1fc 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 20px;
}

.logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
    border-radius: 6px;
}

.logo-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.logo-text h1 {
    font-size: 22px;
    font-weight: 700;
    color: #1e293b;
    letter-spacing: -0.5px;
    margin: 0;
    line-height: 1.2;
}

.logo-text span {
    font-size: 11px;
    color: #64748b;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-top: 2px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-item {
    position: relative;
    padding: 10px 16px;
    font-size: 15px;
    color: #4b5563;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-item:hover,
.nav-item.active {
    color: #0052d9;
    background: rgba(0, 82, 217, 0.08);
}

.nav-item.active {
    background: rgba(0, 82, 217, 0.12);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: linear-gradient(135deg, #0052d9, #4364f7);
    border-radius: 2px;
}

.nav-item.has-dropdown::after {
    content: '▼';
    display: inline-block;
    margin-left: 6px;
    font-size: 10px;
    color: #9ca3af;
    transition: all 0.3s ease;
}

.nav-item.has-dropdown:hover::after {
    color: #0052d9;
    transform: rotate(180deg);
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.12);
    padding: 10px 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.nav-item:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
}

.nav-dropdown a {
    display: block;
    padding: 10px 20px;
    font-size: 14px;
    color: #4b5563;
}

.nav-dropdown a:hover {
    background: #f3f4f6;
    color: #0052d9;
}

.nav-dropdown .nav-item-has-children {
    position: relative;
    display: block;
    padding: 10px 20px;
    font-size: 14px;
    color: #4b5563;
    font-weight: 600;
    border-radius: 6px;
    margin: 2px 8px;
    transition: all 0.3s ease;
}

.nav-dropdown .nav-item-has-children:hover {
    color: #0052d9;
    background: rgba(0, 82, 217, 0.08);
}

.nav-dropdown .nav-item-has-children::after {
    content: '›';
    float: right;
    font-size: 18px;
    color: #9ca3af;
    transition: all 0.3s ease;
}

.nav-dropdown .nav-item-has-children:hover::after {
    color: #0052d9;
    transform: translateX(4px);
}

.nav-dropdown-sub {
    position: absolute;
    top: 0;
    left: 100%;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.12);
    padding: 10px 0;
    min-width: 210px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.nav-dropdown .nav-item-has-children:hover .nav-dropdown-sub {
    opacity: 1;
    visibility: visible;
}

/* 天际龙V5000亮点区 */
.v5000-showcase {
    position: relative;
    background: linear-gradient(180deg, #0D1B2A 0%, #1B263B 50%, #0D1B2A 100%);
    padding: 80px 0;
    overflow: hidden;
}

.v5000-showcase::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.15) 0%, transparent 70%);
}

.v5000-content {
    position: relative;
    z-index: 10;
    text-align: center;
}

.v5000-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2) 0%, rgba(255, 140, 0, 0.2) 100%);
    border: 1px solid rgba(255, 215, 0, 0.4);
    padding: 8px 20px;
    border-radius: 50px;
    color: #FFD700;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
}

.v5000-title {
    font-size: 42px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
    letter-spacing: -1px;
}

.v5000-subtitle {
    font-size: 18px;
    color: #94a3b8;
    margin-bottom: 40px;
}

.v5000-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.v5000-stat {
    text-align: center;
}

.v5000-stat-value {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: #FFD700;
    line-height: 1.2;
}

.v5000-stat-value span {
    font-size: 24px;
    color: #FF8C00;
    font-weight: 400;
}

.v5000-stat-label {
    display: block;
    font-size: 14px;
    color: #94a3b8;
    margin-top: 8px;
}

.v5000-btn {
    display: inline-block;
    background: linear-gradient(135deg, #FFD700 0%, #FF8C00 100%);
    color: #1e293b;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
}

.v5000-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 215, 0, 0.3);
}

/* 战略展示区 */
.strategy-section {
    padding: 80px 0;
    background: #f8fafc;
}

.strategy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.strategy-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.strategy-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.strategy-card.strategy-main {
    background: linear-gradient(135deg, #0052d9 0%, #4364f7 100%);
    color: white;
    border: none;
}

.strategy-card.strategy-main:hover {
    box-shadow: 0 12px 40px rgba(0, 82, 217, 0.3);
}

.strategy-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.strategy-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.strategy-card p {
    font-size: 14px;
    line-height: 1.8;
    color: #64748b;
}

.strategy-card.strategy-main p {
    color: rgba(255, 255, 255, 0.8);
}

/* 天际龙V5000产品页面样式 */
.v5000-product-section {
    background: linear-gradient(180deg, #0D1B2A 0%, #1B263B 50%, #0D1B2A 100%);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.v5000-product-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255, 215, 0, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255, 140, 0, 0.06) 0%, transparent 40%);
}

.v5000-product-header {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    z-index: 10;
}

.v5000-tag {
    display: inline-block;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2) 0%, rgba(255, 140, 0, 0.2) 100%);
    border: 1px solid rgba(255, 215, 0, 0.4);
    padding: 8px 20px;
    border-radius: 50px;
    color: #FFD700;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 16px;
}

.v5000-product-header h2 {
    font-size: 48px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.v5000-description {
    font-size: 18px;
    color: #94a3b8;
}

.v5000-product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
    position: relative;
    z-index: 10;
}

.v5000-spec-main {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1) 0%, rgba(255, 140, 0, 0.1) 100%);
    border: 1px solid rgba(255, 215, 0, 0.3);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    margin-bottom: 24px;
}

.v5000-spec-main .v5000-spec-value {
    font-size: 72px;
    font-weight: 700;
    color: #FFD700;
    line-height: 1.2;
}

.v5000-spec-main .v5000-spec-value span {
    font-size: 32px;
    color: #FF8C00;
    font-weight: 400;
}

.v5000-spec-main .v5000-spec-label {
    font-size: 16px;
    color: #94a3b8;
    margin-top: 8px;
}

.v5000-spec-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.v5000-spec-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.v5000-spec-item .v5000-spec-value {
    font-size: 32px;
    font-weight: 600;
    color: #FFD700;
    display: block;
    margin-bottom: 4px;
}

.v5000-spec-item .v5000-spec-value span {
    font-size: 16px;
    color: #FF8C00;
}

.v5000-spec-item .v5000-spec-label {
    font-size: 13px;
    color: #94a3b8;
}

.v5000-features {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 32px;
}

.v5000-features h3 {
    font-size: 20px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 24px;
}

.v5000-feature-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.v5000-feature {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.v5000-feature-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.v5000-feature h4 {
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 4px;
}

.v5000-feature p {
    font-size: 13px;
    color: #94a3b8;
    line-height: 1.6;
}

.v5000-configurations {
    position: relative;
    z-index: 10;
}

.v5000-configurations h3 {
    font-size: 24px;
    font-weight: 600;
    color: #fff;
    text-align: center;
    margin-bottom: 32px;
}

.v5000-config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.v5000-config-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    transition: all 0.3s ease;
}

.v5000-config-card:hover {
    border-color: rgba(255, 215, 0, 0.4);
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.1);
    transform: translateY(-4px);
}

.v5000-config-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.v5000-config-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: #FFD700;
    margin-bottom: 4px;
}

.v5000-config-card p {
    font-size: 14px;
    color: #94a3b8;
    margin-bottom: 16px;
}

.v5000-config-specs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

.v5000-config-specs span {
    font-size: 12px;
    color: #64748b;
    background: rgba(255, 255, 255, 0.08);
    padding: 4px 12px;
    border-radius: 12px;
}

/* eVTOL专项方案样式 */
.evtol-section {
    background: linear-gradient(180deg, #0D1B2A 0%, #1B263B 100%);
    padding: 80px 0;
}

.evtol-header {
    text-align: center;
    margin-bottom: 48px;
}

.evtol-tag {
    display: inline-block;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2) 0%, rgba(255, 140, 0, 0.2) 100%);
    border: 1px solid rgba(255, 215, 0, 0.4);
    padding: 8px 20px;
    border-radius: 50px;
    color: #FFD700;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 16px;
}

.evtol-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.evtol-header p {
    font-size: 16px;
    color: #94a3b8;
}

.evtol-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.evtol-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 28px;
    display: flex;
    gap: 20px;
    transition: all 0.3s ease;
}

.evtol-card:hover {
    border-color: rgba(255, 215, 0, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.evtol-icon {
    font-size: 40px;
    flex-shrink: 0;
}

.evtol-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 8px;
}

.evtol-content p {
    font-size: 14px;
    color: #94a3b8;
    line-height: 1.6;
    margin-bottom: 16px;
}

.evtol-tags {
    display: flex;
    gap: 8px;
}

.evtol-tags span {
    font-size: 12px;
    color: #FFD700;
    background: rgba(255, 215, 0, 0.1);
    padding: 4px 12px;
    border-radius: 12px;
}

/* 反无设备系列样式 */
.countermeasures-section {
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    padding: 80px 0;
}

.countermeasures-header {
    text-align: center;
    margin-bottom: 48px;
}

.countermeasures-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.countermeasures-header p {
    font-size: 16px;
    color: #94a3b8;
}

.countermeasures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.countermeasures-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.countermeasures-card:hover {
    border-color: rgba(0, 102, 255, 0.4);
    background: rgba(0, 102, 255, 0.05);
    transform: translateY(-4px);
}

.countermeasures-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.countermeasures-img {
    width: 100%;
    height: 150px;
    object-fit: contain;
    background: #f3f4f6;
    border-radius: 8px;
    margin-bottom: 12px;
    padding: 10px;
}

.countermeasures-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: #00D4FF;
    margin-bottom: 6px;
}

.countermeasures-type {
    font-size: 13px;
    color: #94a3b8;
    margin-bottom: 8px;
}

.countermeasures-desc {
    font-size: 14px;
    color: #64748b;
    line-height: 1.5;
}

/* 产品详情页面样式 */
.product-hero {
    background: linear-gradient(135deg, #0a1628 0%, #1e3a5f 100%);
    padding: 80px 0;
    text-align: center;
}

.product-hero-content .tag {
    margin-bottom: 16px;
}

.product-hero-content h1 {
    font-size: 42px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

.product-hero-content p {
    font-size: 18px;
    color: #94a3b8;
    max-width: 600px;
    margin: 0 auto;
}

.product-detail-page {
    padding: 60px 0;
    background: #f8fafc;
}

.detail-content {
    max-width: 1000px;
    margin: 0 auto;
}

.detail-section {
    background: white;
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.detail-section h2 {
    font-size: 24px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #0066FF;
}

.detail-section p {
    font-size: 16px;
    line-height: 1.8;
    color: #475569;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.feature-card {
    background: #f8fafc;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: #64748b;
    line-height: 1.6;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
}

.spec-row {
    display: flex;
    padding: 16px 0;
    border-bottom: 1px solid #e2e8f0;
}

.spec-row:last-child {
    border-bottom: none;
}

.spec-label {
    width: 40%;
    font-weight: 500;
    color: #64748b;
}

.spec-value {
    width: 60%;
    color: #1e293b;
    font-weight: 600;
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.scenario-card {
    background: linear-gradient(135deg, #0066FF 0%, #00D4FF 100%);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    color: white;
}

.scenario-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.scenario-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.scenario-card p {
    font-size: 13px;
    opacity: 0.9;
    line-height: 1.5;
}

.contact-section {
    background: linear-gradient(135deg, #0a1628 0%, #1e3a5f 100%);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    color: white;
}

.contact-section h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    border-bottom: none;
    padding-bottom: 0;
}

.contact-section p {
    color: #94a3b8;
    margin-bottom: 24px;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

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

.contact-icon {
    font-size: 20px;
}

.contact-item span:last-child {
    font-size: 16px;
}

/* 主横幅 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    background: linear-gradient(135deg, #0a1628 0%, #1e3a5f 50%, #0d2137 100%);
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 82, 217, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(67, 100, 247, 0.2) 0%, transparent 50%),
        linear-gradient(180deg, transparent 0%, rgba(0, 82, 217, 0.1) 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 82, 217, 0.2);
    border: 1px solid rgba(0, 82, 217, 0.4);
    padding: 8px 16px;
    border-radius: 50px;
    color: #60a5fa;
    font-size: 14px;
    margin-bottom: 24px;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #3b82f6;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    color: white;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero h1 span {
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 20px;
    color: #94a3b8;
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #0052d9, #4364f7);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 82, 217, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 82, 217, 0.5);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 42px;
    font-weight: 700;
    color: white;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-number span {
    color: #60a5fa;
}

.stat-label {
    font-size: 14px;
    color: #94a3b8;
}

/* 关于我们 */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 82, 217, 0.05);
    border: 1px solid rgba(0, 82, 217, 0.2);
    padding: 6px 16px;
    border-radius: 50px;
    color: #0052d9;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: #6b7280;
    max-width: 700px;
    margin: 0 auto;
}

.bg-light {
    background: #f9fafb;
}

.company-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.company-content h3 {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 24px;
}

.company-content p {
    font-size: 16px;
    color: #4b5563;
    line-height: 1.8;
    margin-bottom: 32px;
}

.company-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: white;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.feature-item:hover {
    border-color: #0052d9;
    box-shadow: 0 4px 15px rgba(0, 82, 217, 0.1);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.1), rgba(67, 100, 247, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #0052d9;
    font-size: 24px;
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 4px;
}

.feature-item p {
    font-size: 14px;
    color: #6b7280;
    margin: 0;
}

.company-image {
    position: relative;
}

.company-image-card {
    background: linear-gradient(135deg, #0a1628, #1e3a5f);
    border-radius: 16px;
    padding: 40px;
    color: white;
}

.company-image-card h4 {
    font-size: 24px;
    margin-bottom: 16px;
}

.company-values {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 60px;
}

.value-card {
    background: white;
    padding: 32px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.value-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-color: #0052d9;
}

.value-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.1), rgba(67, 100, 247, 0.1));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: #0052d9;
    font-size: 32px;
}

.value-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.value-card p {
    font-size: 14px;
    color: #6b7280;
}

/* 产品中心 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.product-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid #e5e7eb;
    transition: all 0.4s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: #0052d9;
}

.product-image {
    height: 240px;
    background: linear-gradient(135deg, #0a1628, #1e3a5f);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    position: relative;
    overflow: hidden;
}

.product-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(0, 82, 217, 0.2));
}

.product-image img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    position: relative;
    z-index: 1;
}

.product-content {
    padding: 28px;
}

.product-tag {
    display: inline-block;
    background: rgba(0, 82, 217, 0.08);
    color: #0052d9;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
}

.product-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.product-content p {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.7;
    margin-bottom: 20px;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.product-feature-tag {
    background: #f3f4f6;
    color: #4b5563;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #0052d9;
    font-size: 14px;
    font-weight: 600;
}

.product-link:hover {
    gap: 10px;
}

/* 解决方案 */
.solutions-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 60px;
    background: white;
    padding: 8px;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.solution-tab {
    flex: 1;
    padding: 12px 24px;
    border-radius: 8px;
    text-align: center;
    font-size: 15px;
    font-weight: 500;
    color: #6b7280;
    cursor: pointer;
    transition: all 0.3s ease;
}

.solution-tab:hover {
    color: #0052d9;
}

.solution-tab.active {
    background: linear-gradient(135deg, #0052d9, #4364f7);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 82, 217, 0.3);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.solution-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
    display: flex;
    gap: 24px;
}

.solution-card:hover {
    border-color: #0052d9;
    box-shadow: 0 10px 30px rgba(0, 82, 217, 0.1);
    transform: translateY(-4px);
}

.solution-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.1), rgba(67, 100, 247, 0.1));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    flex-shrink: 0;
}

.solution-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.solution-content p {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.7;
    margin-bottom: 16px;
}

.solution-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.solution-tag {
    background: #f3f4f6;
    color: #4b5563;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
}

/* 技术优势 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.advantage-card {
    text-align: center;
    padding: 40px 24px;
    background: white;
    border-radius: 16px;
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-color: #0052d9;
}

.advantage-number {
    font-size: 56px;
    font-weight: 700;
    background: linear-gradient(135deg, #0052d9, #4364f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 16px;
}

.advantage-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.6;
}

/* 底部 */
.footer {
    background: linear-gradient(180deg, #0a1628 0%, #0f1f36 100%);
    color: white;
    padding: 80px 0 40px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, rgba(0, 82, 217, 0.5) 50%, transparent 100%);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2.2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    min-width: 320px;
    padding: 24px;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.08) 0%, rgba(67, 100, 247, 0.05) 100%);
    border-radius: 16px;
    border: 1px solid rgba(0, 82, 217, 0.15);
}

.footer-logo-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.footer-logo-text h1 {
    font-size: 20px;
    font-weight: 600;
    color: white;
    margin: 0;
}

.footer-logo-text span {
    font-size: 11px;
    color: #64748b;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.footer-brand h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #ffffff 0%, #93c5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.footer-brand .brand-subtitle {
    font-size: 12px;
    color: #64748b;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 20px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.footer-brand p {
    font-size: 14px;
    color: #94a3b8;
    line-height: 1.8;
    margin-bottom: 24px;
    text-align: justify;
}

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

.footer-social a {
    padding: 12px 24px;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.2) 0%, rgba(67, 100, 247, 0.15) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: 500;
    color: #cbd5e1;
    border: 1px solid rgba(0, 82, 217, 0.3);
}

.footer-social a:hover {
    background: linear-gradient(135deg, #0052d9 0%, #4364f7 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 82, 217, 0.4);
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 24px;
}

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

.footer-column a {
    font-size: 14px;
    color: #94a3b8;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: #6b7280;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: #6b7280;
}

.footer-links a:hover {
    color: white;
}

/* 响应式 */
@media (max-width: 968px) {
    .hero h1 {
        font-size: 42px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .company-intro {
        grid-template-columns: 1fr;
    }
    
    .products-grid,
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    /* 移动端菜单样式 */
    .menu-toggle {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 44px;
        height: 44px;
        background: transparent;
        border: none;
        cursor: pointer;
        z-index: 1001;
        position: relative;
    }

    .hamburger {
        width: 24px;
        height: 2px;
        background: #1e293b;
        transition: all 0.3s ease;
        position: relative;
    }

    .hamburger::before,
    .hamburger::after {
        content: '';
        position: absolute;
        width: 24px;
        height: 2px;
        background: #1e293b;
        transition: all 0.3s ease;
    }

    .hamburger::before { top: -8px; }
    .hamburger::after { top: 8px; }

    /* 菜单展开状态 */
    .menu-toggle.active .hamburger {
        background: transparent;
    }

    .menu-toggle.active .hamburger::before {
        top: 0;
        transform: rotate(45deg);
        background: #0052d9;
    }

    .menu-toggle.active .hamburger::after {
        top: 0;
        transform: rotate(-45deg);
        background: #0052d9;
    }

    /* 移动端菜单 */
    .nav {
        position: fixed;
        top: 0;
        right: -280px;
        width: 280px;
        min-height: 100vh;
        height: auto;
        max-height: 100vh;
        background: white;
        flex-direction: column;
        padding: 80px 24px 24px;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        z-index: 1001;
        display: flex !important;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        box-sizing: border-box;
        bottom: 0;
        left: auto;
    }

    .nav.active {
        right: 0;
    }

    .nav-item {
        padding: 16px 0;
        border-bottom: 1px solid #e5e7eb;
        font-size: 16px;
        color: #4b5563;
    }

    .nav-item:hover {
        color: #0052d9;
    }

    /* 下拉菜单 */
    .nav-dropdown {
        position: static;
        visibility: visible;
        opacity: 1;
        box-shadow: none;
        padding: 8px 0 8px 16px;
        background: #f8fafc;
        border-radius: 8px;
        margin-top: 8px;
        transform: none;
    }

    .nav-dropdown a {
        padding: 8px 0;
        font-size: 14px;
    }

    /* 移动端三级菜单 */
    .nav-dropdown-sub {
        position: static;
        opacity: 0;
        visibility: hidden;
        max-height: 0;
        overflow: hidden;
        padding: 0;
        margin-left: 16px;
        background: transparent;
        box-shadow: none;
        transition: all 0.3s ease;
    }

    .nav-dropdown-sub.active {
        opacity: 1;
        visibility: visible;
        max-height: 500px;
        padding: 8px 0;
    }

    .nav-dropdown-sub a {
        padding: 8px 0;
        font-size: 13px;
        color: #6b7280;
    }

    /* 移动端二级菜单项 */
    .nav-dropdown .nav-item-has-children {
        cursor: pointer;
        position: relative;
        display: block;
        padding: 8px 0;
        font-size: 14px;
        color: #4b5563;
        font-weight: 600;
    }

    .nav-dropdown .nav-item-has-children::after {
        content: '›';
        float: right;
        font-size: 18px;
        color: #9ca3af;
        transition: all 0.3s ease;
    }

    /* 遮罩层 */
    .menu-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
    }

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

    .hero h1 {
        font-size: 32px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .hero-stats {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    
    .stat-number {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .company-features {
        grid-template-columns: 1fr;
    }
    
    .company-values {
        grid-template-columns: 1fr 1fr;
    }
    
    .products-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .solutions-tabs {
        flex-direction: column;
    }
    
    .solution-card {
        flex-direction: column;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

/* 核心技术模块样式 */
.core-tech-section {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid #e5e7eb;
}

.core-tech-header {
    text-align: center;
    margin-bottom: 40px;
}

.core-tech-header h3 {
    font-size: 28px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.core-tech-header p {
    font-size: 15px;
    color: #64748b;
}

.core-tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.core-tech-card {
    position: relative;
    background: #ffffff;
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.core-tech-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    border-color: #cbd5e1;
}

/* 金银铜卡片样式 */
.core-tech-card.gold {
    background: linear-gradient(145deg, #fefce8 0%, #fef9c3 50%, #fef08a 100%);
    border-color: #fbbf24;
}

.core-tech-card.silver {
    background: linear-gradient(145deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
    border-color: #94a3b8;
}

.core-tech-card.bronze {
    background: linear-gradient(145deg, #fff7ed 0%, #fed7aa 50%, #fdba74 100%);
    border-color: #d97706;
}

.card-rank {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.rank-number {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: 600;
}

.core-tech-card.gold .rank-number {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.core-tech-card.silver .rank-number {
    background: linear-gradient(135deg, #9ca3af 0%, #6b7280 100%);
}

.core-tech-card.bronze .rank-number {
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
}

.rank-medal {
    font-size: 20px;
}

.card-icon {
    width: 56px;
    height: 56px;
    background: rgba(30, 58, 95, 0.06);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    color: #334155;
    transition: all 0.3s ease;
}

.core-tech-card:hover .card-icon {
    transform: scale(1.05);
    background: rgba(30, 58, 95, 0.1);
}

.card-icon svg {
    width: 24px;
    height: 24px;
}

.core-tech-card h4 {
    font-size: 17px;
    font-weight: 600;
    color: #1e3a5f;
    margin-bottom: 8px;
}

.core-tech-card p {
    font-size: 13px;
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 16px;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.card-features span {
    font-size: 11px;
    padding: 5px 10px;
    background: rgba(30, 58, 95, 0.06);
    color: #475569;
    border-radius: 10px;
    font-weight: 500;
}

.core-tech-card.gold .card-features span {
    background: rgba(251, 191, 36, 0.15);
    color: #92400e;
}

.core-tech-card.silver .card-features span {
    background: rgba(148, 163, 184, 0.15);
    color: #475569;
}

.core-tech-card.bronze .card-features span {
    background: rgba(217, 119, 6, 0.15);
    color: #9a3412;
}

.card-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.card-stack span {
    font-size: 11px;
    padding: 5px 10px;
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
    color: #4338ca;
    border-radius: 10px;
    font-weight: 500;
}

.card-importance {
    display: flex;
    align-items: center;
    gap: 6px;
}

.card-importance span:first-child {
    font-size: 11px;
    color: #64748b;
}

.card-importance .stars {
    font-size: 12px;
}

.tech-details {
    background: #ffffff;
    border-radius: 12px;
    padding: 25px;
}

.tech-details h5 {
    font-size: 16px;
    font-weight: 600;
    color: #1e3a5f;
    margin-bottom: 18px;
}

.dimension-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 25px;
}

.dimension-item {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.dimension-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.dimension-icon {
    font-size: 28px;
    margin-bottom: 10px;
}

.dimension-label {
    font-size: 14px;
    font-weight: 600;
    color: #1e3a5f;
    margin-bottom: 6px;
}

.dimension-desc {
    font-size: 12px;
    color: #64748b;
    line-height: 1.5;
}

.hybrid-strategy {
    margin-bottom: 25px;
}

.strategy-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 12px;
    padding: 12px 16px;
    background: #f8fafc;
    border-radius: 8px;
}

.strategy-label {
    font-size: 14px;
    font-weight: 600;
    color: #1e3a5f;
    min-width: 100px;
    margin-right: 15px;
}

.strategy-desc {
    font-size: 14px;
    color: #64748b;
    flex: 1;
}

.tech-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.highlight-tag {
    font-size: 13px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
    color: #166534;
    border-radius: 20px;
    font-weight: 500;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .tech-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .tech-icon {
        margin-right: 0;
        margin-bottom: 20px;
    }
    
    .dimension-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .strategy-item {
        flex-direction: column;
    }
    
    .strategy-label {
        margin-right: 0;
        margin-bottom: 5px;
        min-width: auto;
    }
}

/* 核心技术模块样式 */
#core-tech {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

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

#core-tech .section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 15px;
}

#core-tech .section-header p {
    font-size: 16px;
    color: #64748b;
}

.tech-ranking {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.tech-card {
    display: flex;
    align-items: flex-start;
    background: #ffffff;
    border-radius: 16px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.tech-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.tech-card.gold {
    border-left: 4px solid #f59e0b;
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
}

.tech-card.silver {
    border-left: 4px solid #9ca3af;
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
}

.tech-card.bronze {
    border-left: 4px solid #d97706;
    background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
}

.tech-rank {
    font-size: 36px;
    margin-right: 20px;
    flex-shrink: 0;
}

.tech-card:not(.gold):not(.silver):not(.bronze) .tech-rank {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: 600;
}

.tech-content {
    flex: 1;
}

.tech-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1e3a5f;
    margin-bottom: 8px;
}

.tech-desc {
    font-size: 14px;
    color: #64748b;
    margin-bottom: 15px;
    line-height: 1.6;
}

.tech-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.highlight-item {
    font-size: 13px;
    padding: 6px 14px;
    background: #e0e7ff;
    color: #4338ca;
    border-radius: 16px;
    font-weight: 500;
}

.tech-stack {
    margin-bottom: 12px;
}

.stack-label {
    font-size: 13px;
    color: #64748b;
    margin-right: 8px;
}

.stack-value {
    font-size: 13px;
    font-weight: 600;
    color: #1e3a5f;
}

.importance {
    margin-top: 12px;
    display: flex;
    align-items: center;
}

.importance-label {
    font-size: 13px;
    color: #64748b;
    margin-right: 8px;
}

.importance-stars {
    font-size: 16px;
}

/* 核心技术响应式 */
@media (max-width: 768px) {
    .tech-card {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .tech-rank {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .tech-content h3 {
        font-size: 18px;
    }
    
    .highlight-item {
        font-size: 12px;
        padding: 5px 12px;
    }
}