/* ===========================
   北京域耘科技有限公司 - 官网样式
   =========================== */

/* ===== 基础重置 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0A6CFF;
    --primary-dark: #0050D0;
    --primary-light: #3B8DFF;
    --accent: #00D4AA;
    --dark: #0E1530;
    --dark-2: #1A2444;
    --gray-1: #F7F9FC;
    --gray-2: #ECEFF5;
    --gray-3: #C5CBD6;
    --gray-4: #8A93A6;
    --gray-5: #5A6275;
    --white: #FFFFFF;
    --text: #1F2533;
    --text-secondary: #5A6275;
    --radius: 14px;
    --radius-sm: 8px;
    --shadow-sm: 0 2px 8px rgba(14, 21, 48, 0.06);
    --shadow-md: 0 8px 28px rgba(14, 21, 48, 0.10);
    --shadow-lg: 0 20px 50px rgba(14, 21, 48, 0.14);
    --max-width: 1200px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(10, 108, 255, 0.35);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(10, 108, 255, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-white {
    background: var(--white);
    color: var(--primary);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.12);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-2);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 19px;
    font-weight: 700;
    color: var(--dark);
}

.logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 20px;
    font-weight: 800;
    flex-shrink: 0;
}

.logo img {
    height: 42px;
    width: auto;
    display: block;
    flex-shrink: 0;
}

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


.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-links a {
    padding: 8px 18px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover {
    color: var(--primary);
    background: rgba(10, 108, 255, 0.06);
}

.nav-links a.active {
    color: var(--primary);
    font-weight: 600;
}

.nav-links a.active::after {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.nav-cta {
    margin-left: 12px;
}

.nav-cta .btn {
    padding: 9px 24px;
    font-size: 14px;
}

/* 移动端汉堡菜单 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    width: 26px;
    height: 3px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 7px);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -7px);
}

/* ===== 通用 Section ===== */
.section {
    padding: 90px 0;
}

.section-gray {
    background: var(--gray-1);
}

.section-dark {
    background: var(--dark);
    color: var(--white);
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-block;
    padding: 5px 16px;
    background: rgba(10, 108, 255, 0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.section-dark .section-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent);
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    color: var(--dark);
}

.section-dark .section-title {
    color: var(--white);
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.section-dark .section-subtitle {
    color: rgba(255, 255, 255, 0.65);
}

/* ===== 首页 Hero ===== */
.hero {
    position: relative;
    padding-top: 68px;
    background: linear-gradient(160deg, #0A6CFF 0%, #0050D0 40%, #0E1530 100%);
    overflow: hidden;
    color: var(--white);
}

.hero::before {
    content: "";
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.15), transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -300px;
    left: -200px;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(59, 141, 255, 0.12), transparent 70%);
    border-radius: 50%;
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 100px 24px 120px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 30px;
    font-size: 13px;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero h1 {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, #00D4AA, #3B8DFF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 36px;
    max-width: 540px;
}

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

.hero-visual {
    position: relative;
}

.hero-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    padding: 32px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.hero-card .card-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.hero-card .card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.2), rgba(59, 141, 255, 0.2));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.hero-card .card-info h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.hero-card .card-info p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.55);
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-stat .num {
    font-size: 40px;
    font-weight: 800;
    background: linear-gradient(135deg, #00D4AA, #3B8DFF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-stat .label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 4px;
}

/* ===== 特性卡片 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-2);
    border-radius: var(--radius);
    padding: 36px 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(10, 108, 255, 0.1), rgba(0, 212, 170, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 22px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--dark);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== 产品卡片 ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.product-card {
    background: var(--white);
    border: 1px solid var(--gray-2);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.product-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.product-header {
    padding: 36px 32px 28px;
    position: relative;
}

.product-header .product-tag {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(10, 108, 255, 0.08);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: 16px;
    margin-bottom: 14px;
}

.product-header h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}

.product-header p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.product-body {
    padding: 0 32px 32px;
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.product-features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: var(--text);
}

.product-features li::before {
    content: "✓";
    color: var(--accent);
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ===== 解决方案 ===== */
.solution-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.solution-item {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 0;
    background: var(--white);
    border: 1px solid var(--gray-2);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.solution-item:hover {
    box-shadow: var(--shadow-md);
}

.solution-visual {
    padding: 40px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.solution-visual.bg-blue { background: linear-gradient(135deg, #0A6CFF, #0050D0); color: #fff; }
.solution-visual.bg-teal { background: linear-gradient(135deg, #00B894, #00D4AA); color: #fff; }
.solution-visual.bg-purple { background: linear-gradient(135deg, #6C5CE7, #4834D4); color: #fff; }
.solution-visual.bg-orange { background: linear-gradient(135deg, #E17055, #FDA085); color: #fff; }

.solution-visual .sol-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.solution-visual h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.solution-visual p {
    font-size: 14px;
    opacity: 0.8;
}

.solution-content {
    padding: 40px 36px;
}

.solution-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 14px;
    margin-top: 18px;
}

.solution-content h4:first-child {
    margin-top: 0;
}

.solution-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.solution-points {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.solution-points span {
    padding: 5px 14px;
    background: var(--gray-1);
    border: 1px solid var(--gray-2);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

/* ===== 学术科研 ===== */
.research-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 56px;
}

.research-card {
    text-align: center;
    padding: 36px 24px;
    background: var(--white);
    border: 1px solid var(--gray-2);
    border-radius: var(--radius);
    transition: var(--transition);
}

.research-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: var(--primary-light);
}

.research-card .r-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--white);
}

.research-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark);
}

.research-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 论文列表 */
.paper-list {
    max-width: 900px;
    margin: 0 auto;
}

.paper-item {
    display: flex;
    gap: 20px;
    padding: 24px 0;
    border-bottom: 1px solid var(--gray-2);
}

.paper-item:last-child {
    border-bottom: none;
}

.paper-year {
    flex-shrink: 0;
    width: 70px;
    text-align: center;
}

.paper-year .y {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
}

.paper-year .v {
    font-size: 12px;
    color: var(--gray-4);
}

.paper-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 6px;
    line-height: 1.6;
}

.paper-info .meta {
    font-size: 13px;
    color: var(--gray-4);
    margin-bottom: 6px;
}

.paper-info .abstract {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 关于我们 ===== */
.about-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 20px;
    line-height: 1.3;
}

.about-text p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 16px;
}

.about-visual {
    position: relative;
}

.about-visual .about-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 20px;
    padding: 40px;
    color: var(--white);
}

.about-visual .about-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
}

.about-visual .val-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.about-visual .val-item {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.about-visual .val-item .v-icon {
    font-size: 28px;
    margin-bottom: 10px;
}

.about-visual .val-item .v-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.about-visual .val-item .v-desc {
    font-size: 12px;
    opacity: 0.7;
}

/* 发展历程 */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-2);
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    padding-bottom: 40px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 21px;
    top: 4px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--white);
    border: 4px solid var(--primary);
}

.timeline-item h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.timeline-item .t-date {
    font-size: 13px;
    color: var(--gray-4);
    margin-bottom: 8px;
}

.timeline-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 团队 */
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.team-card {
    text-align: center;
    padding: 36px 20px;
    background: var(--white);
    border: 1px solid var(--gray-2);
    border-radius: var(--radius);
    transition: var(--transition);
}

.team-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.team-avatar {
    width: 80px;
    height: 80px;
    margin: 0 auto 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--white);
    font-weight: 700;
}

.team-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.team-card .role {
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 10px;
}

.team-card .bio {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 联系方式 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.contact-info {
    background: linear-gradient(135deg, var(--dark), var(--dark-2));
    color: var(--white);
    padding: 48px 40px;
}

.contact-info h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 28px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-item .c-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-item .c-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 4px;
}

.contact-item .c-value {
    font-size: 15px;
    font-weight: 500;
}

.contact-form {
    background: var(--white);
    padding: 48px 40px;
}

.contact-form h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-2);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    transition: var(--transition);
    background: var(--gray-1);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(10, 108, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== CTA 区域 ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    text-align: center;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: "";
    position: absolute;
    top: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.2), transparent 70%);
    border-radius: 50%;
}

.cta-section h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
    position: relative;
}

.cta-section p {
    font-size: 16px;
    opacity: 0.8;
    margin-bottom: 32px;
    position: relative;
}

.cta-section .btn {
    position: relative;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.6);
    padding: 64px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand .logo img {
    height: 48px;
    filter: brightness(0) invert(1);
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    max-width: 320px;
}

.footer-brand .social {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.footer-brand .social a {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition);
}

.footer-brand .social a:hover {
    background: var(--primary);
    color: var(--white);
}

.footer-col h4 {
    color: var(--white);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 18px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    padding: 5px 0;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--white);
    padding-left: 4px;
}

.footer-bottom {
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
}

.footer-bottom a {
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--white);
}

.footer-bottom .beian-link {
    color: var(--gray-4);
    margin-left: auto;
}

.footer-bottom .beian-link:hover {
    color: var(--white);
}

/* ===== 页面通用 Banner ===== */
.page-banner {
    padding-top: 68px;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
    color: var(--white);
    text-align: center;
    padding-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(10, 108, 255, 0.15), transparent 70%);
    border-radius: 50%;
}

.page-banner h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    position: relative;
}

.page-banner p {
    font-size: 16px;
    opacity: 0.7;
    position: relative;
}

/* ===== 动画 ===== */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 968px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 70px 24px 80px;
    }

    .hero-desc {
        margin: 0 auto 36px;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-badge {
        margin: 0 auto 28px;
    }

    .features-grid,
    .products-grid,
    .research-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }

    .about-hero {
        grid-template-columns: 1fr;
    }

    .solution-item {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-top {
        grid-template-columns: 1fr 1fr;
    }

    .section-title {
        font-size: 28px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--gray-2);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        width: 100%;
        padding: 14px 18px;
        border-radius: var(--radius-sm);
    }

    .nav-links a.active::after {
        display: none;
    }

    .nav-cta {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-desc {
        font-size: 15px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
        align-items: center;
    }

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

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 24px;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

    .contact-info,
    .contact-form {
        padding: 32px 24px;
    }

    .page-banner h1 {
        font-size: 30px;
    }

    .container {
        padding: 0 16px;
    }

    .cta-section h2 {
        font-size: 26px;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: 60px;
    }

    .timeline-dot {
        left: 11px;
    }
}