/* ============================
   全局变量与重置
   ============================ */
:root {
    --color-primary: #0A4D68;
    --color-secondary: #088395;
    --color-accent: #05BFDB;
    --color-accent-light: #7DF9FF;
    --color-success: #00C896;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F0F8FF;
    --color-bg-dark: #0A1929;
    --color-text: #1A1A2E;
    --color-text-light: #555;
    --color-text-muted: #888;
    --color-border: #E0E8F0;
    --gradient-primary: linear-gradient(135deg, #0A4D68 0%, #088395 50%, #05BFDB 100%);
    --gradient-accent: linear-gradient(135deg, #05BFDB 0%, #00FFCA 100%);
    --gradient-dark: linear-gradient(180deg, #0A1929 0%, #0D2840 100%);
    --shadow-sm: 0 2px 8px rgba(10, 77, 104, 0.08);
    --shadow-md: 0 8px 24px rgba(10, 77, 104, 0.12);
    --shadow-lg: 0 20px 60px rgba(10, 77, 104, 0.15);
    --shadow-glow: 0 0 40px rgba(5, 191, 219, 0.3);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

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

/* ============================
   导航栏
   ============================ */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

#navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--color-primary);
}

.logo-text {
    letter-spacing: 1px;
}

.nav-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
    box-shadow: 0 2px 8px rgba(5, 191, 219, 0.3);
    transition: var(--transition);
}

.nav-logo:hover .nav-logo-img {
    box-shadow: 0 4px 16px rgba(5, 191, 219, 0.5);
    transform: rotate(-3deg) scale(1.05);
}

.nav-menu {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-link {
    font-size: 15px;
    color: var(--color-text-light);
    font-weight: 500;
    position: relative;
    transition: var(--transition);
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: width 0.3s ease;
    border-radius: 2px;
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-cta {
    padding: 10px 24px;
    background: var(--gradient-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(10, 77, 104, 0.3);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(10, 77, 104, 0.4);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================
   Hero
   ============================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--gradient-dark);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.hero-glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(5, 191, 219, 0.6), transparent 70%);
    top: -200px;
    right: -100px;
    animation: floatGlow 8s ease-in-out infinite;
}

.hero-glow-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(10, 77, 104, 0.8), transparent 70%);
    bottom: -150px;
    left: -100px;
    animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-accent);
    border-radius: 50%;
    opacity: 0.3;
    animation: floatParticle linear infinite;
}

@keyframes floatParticle {
    0% { transform: translateY(100vh) translateX(0); opacity: 0; }
    10% { opacity: 0.5; }
    90% { opacity: 0.5; }
    100% { transform: translateY(-100px) translateX(50px); opacity: 0; }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 24px 80px;
    max-width: 800px;
}

.hero-brand {
    margin-bottom: 28px;
    animation: fadeInUp 1s ease-out;
}

.hero-logo-img {
    width: 280px;
    height: auto;
    max-width: 80vw;
    border-radius: var(--radius-md);
    filter: drop-shadow(0 0 40px rgba(5, 191, 219, 0.4))
            drop-shadow(0 0 80px rgba(5, 191, 219, 0.2));
    transition: var(--transition);
}

.hero-logo-img:hover {
    transform: scale(1.03);
    filter: drop-shadow(0 0 60px rgba(5, 191, 219, 0.6))
            drop-shadow(0 0 120px rgba(5, 191, 219, 0.3));
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(5, 191, 219, 0.15);
    border: 1px solid rgba(5, 191, 219, 0.3);
    border-radius: 100px;
    color: var(--color-accent-light);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    position: relative;
}

.pulse-dot::after {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border-radius: 50%;
    opacity: 0.4;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(0.8); opacity: 0.4; }
    50% { transform: scale(1.5); opacity: 0; }
}

.hero-title {
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(15px, 2vw, 18px);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--color-bg-dark);
    box-shadow: 0 4px 20px rgba(5, 191, 219, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(5, 191, 219, 0.5);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 17px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 900;
    color: var(--color-accent-light);
    line-height: 1;
}

.stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 8px;
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: rgba(255, 255, 255, 0.15);
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 2;
}

.scroll-indicator span {
    display: block;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.scroll-arrow {
    width: 20px;
    height: 32px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    margin: 0 auto;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 2px;
    animation: scrollDown 1.5s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { transform: translateX(-50%) translateY(0); opacity: 1; }
    100% { transform: translateX(-50%) translateY(12px); opacity: 0; }
}

/* ============================
   通用 Section
   ============================ */
.section {
    padding: 100px 0;
    position: relative;
}

.section-product {
    background: var(--color-bg);
}

.section-tech {
    background: var(--color-bg-alt);
}

.section-team {
    background: var(--color-bg);
}

.section-partnership {
    background: var(--color-bg-alt);
}

.section-contact {
    background: var(--color-bg);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 900;
    color: var(--color-text);
    margin-bottom: 12px;
}

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

/* ============================
   产品介绍
   ============================ */
.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.product-visual {
    display: flex;
    justify-content: center;
}

.product-image-wrapper {
    position: relative;
    width: 100%;
    max-width: 360px;
}

.product-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(5, 191, 219, 0.2), transparent 70%);
    border-radius: 50%;
    filter: blur(40px);
}

.product-mockup {
    position: relative;
    z-index: 1;
    animation: floatMockup 4s ease-in-out infinite;
}

@keyframes floatMockup {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.product-mockup svg {
    width: 100%;
    height: auto;
}

.product-info {
    padding: 0 8px;
}

.product-name {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.product-tagline {
    font-size: 16px;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 20px;
}

.product-desc {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 32px;
}

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

.feature-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.feature-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: rgba(5, 191, 219, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary);
    transition: var(--transition);
}

.feature-item:hover .feature-icon {
    background: var(--gradient-accent);
    color: #fff;
    transform: scale(1.05);
}

.feature-text h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.feature-text p {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ============================
   核心技术
   ============================ */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

.tech-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: left;
}

.tech-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.tech-number {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 36px;
    font-weight: 900;
    color: rgba(5, 191, 219, 0.08);
    line-height: 1;
}

.tech-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(5, 191, 219, 0.06);
    border-radius: 50%;
    transition: var(--transition);
}

.tech-card:hover .tech-icon {
    background: rgba(5, 191, 219, 0.12);
    transform: scale(1.05);
}

.tech-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.tech-desc {
    font-size: 13px;
    color: var(--color-text-light);
    line-height: 1.7;
}

.tech-pipeline {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--color-border);
}

.pipeline-title {
    text-align: center;
    font-size: 15px;
    color: var(--color-text-muted);
    margin-bottom: 32px;
    font-weight: 500;
}

.pipeline-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.pipeline-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.pipeline-dot {
    width: 16px;
    height: 16px;
    background: var(--gradient-accent);
    border-radius: 50%;
    box-shadow: 0 0 0 6px rgba(5, 191, 219, 0.1);
    transition: var(--transition);
}

.pipeline-step:hover .pipeline-dot {
    box-shadow: 0 0 0 10px rgba(5, 191, 219, 0.15);
    transform: scale(1.1);
}

.pipeline-step span {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.pipeline-line {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-border));
    margin-bottom: 24px;
}

/* ============================
   科研团队
   ============================ */
.team-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: center;
}

.team-highlight {
    background: var(--gradient-dark);
    border-radius: var(--radius-lg);
    padding: 48px;
    position: relative;
    overflow: hidden;
    color: #fff;
}

.team-highlight::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(5, 191, 219, 0.2), transparent 70%);
    border-radius: 50%;
}

.team-badge {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.team-leader {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}

.team-title {
    font-size: 15px;
    color: var(--color-accent-light);
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.team-bio {
    font-size: 15px;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.7);
    position: relative;
    z-index: 1;
}

.team-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.team-stat-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}

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

.team-stat-num {
    font-size: 32px;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
}

.team-stat-num span {
    color: var(--color-accent);
}

.team-stat-label {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: 8px;
}

/* ============================
   招商合作
   ============================ */
.partnership-banner {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: 48px;
    margin-bottom: 48px;
    position: relative;
    overflow: hidden;
}

.partnership-banner::before {
    content: '';
    position: absolute;
    bottom: -80px;
    right: -80px;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent 70%);
    border-radius: 50%;
}

.partnership-stats-row {
    display: flex;
    justify-content: space-around;
    align-items: center;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
    gap: 32px;
}

.ps-item {
    text-align: center;
}

.ps-num {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 900;
    color: #fff;
    line-height: 1;
}

.ps-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 10px;
}

.partnership-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.benefit-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.benefit-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.benefit-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: var(--transition);
}

.benefit-icon-1 { background: linear-gradient(135deg, #00C896, #00A876); }
.benefit-icon-2 { background: linear-gradient(135deg, #05BFDB, #088395); }
.benefit-icon-3 { background: linear-gradient(135deg, #F5A623, #E89400); }
.benefit-icon-4 { background: linear-gradient(135deg, #8B5CF6, #6B46C1); }

.benefit-card:hover .benefit-icon {
    transform: scale(1.1) rotate(5deg);
}

.benefit-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;
}

.benefit-card p {
    font-size: 13px;
    color: var(--color-text-light);
    line-height: 1.6;
}

.partnership-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #fff;
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-lg);
    padding: 40px 48px;
    flex-wrap: wrap;
    gap: 24px;
}

.partnership-cta-content h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 6px;
}

.partnership-cta-content p {
    font-size: 15px;
    color: var(--color-text-light);
}

/* ============================
   联系我们
   ============================ */
.contact-card {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 48px;
    align-items: center;
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    padding: 56px 48px;
    border: 1px solid var(--color-border);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: center;
}

.contact-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    background: #fff;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-item:hover .contact-icon {
    background: var(--gradient-accent);
    color: #fff;
    transform: scale(1.05);
}

.contact-label {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 2px;
}

.contact-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
}

a.contact-value {
    color: var(--color-secondary);
    transition: var(--transition);
}

a.contact-value:hover {
    color: var(--color-accent);
}

.contact-illustration {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.contact-glow {
    position: absolute;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(5, 191, 219, 0.15), transparent 70%);
    border-radius: 50%;
    filter: blur(30px);
}

.contact-circle {
    position: relative;
    z-index: 1;
    animation: spinSlow 20s linear infinite;
}

@keyframes spinSlow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ============================
   页脚
   ============================ */
.footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

.footer-logo-img {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 4px 16px rgba(5, 191, 219, 0.4);
    transition: var(--transition);
}

.footer-logo:hover .footer-logo-img {
    box-shadow: 0 6px 24px rgba(5, 191, 219, 0.6);
    transform: rotate(-3deg) scale(1.05);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    max-width: 480px;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col h4 {
    font-size: 15px;
    color: #fff;
    margin-bottom: 16px;
    font-weight: 600;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--color-accent);
    transform: translateX(4px);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

/* ============================
   语言切换
   ============================ */
html[data-lang="en"] .lang-zh { display: none !important; }
html[data-lang="zh"] .lang-en { display: none !important; }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-toggle {
    padding: 6px 14px;
    border: 1.5px solid var(--color-border);
    border-radius: 100px;
    background: transparent;
    color: var(--color-text-light);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    letter-spacing: 0.5px;
}

.lang-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: rgba(5, 191, 219, 0.05);
}

/* ============================
   关于我们
   ============================ */
.section-about {
    background: var(--color-bg-alt);
}

.about-intro {
    max-width: 900px;
    margin: 0 auto 56px;
    text-align: center;
}

.about-intro p {
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 2;
    margin-bottom: 20px;
}

.about-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.about-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: center;
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.about-card-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: rgba(5, 191, 219, 0.08);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary);
    transition: var(--transition);
}

.about-card:hover .about-card-icon {
    background: var(--gradient-accent);
    color: #fff;
    transform: scale(1.05);
}

.about-card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.about-card-text {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================
   技术优势概述
   ============================ */
.tech-overview {
    max-width: 900px;
    margin: 0 auto 56px;
    text-align: center;
}

.tech-overview p {
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 2;
}

/* ============================
   科研团队 - 扩展
   ============================ */
.team-overview {
    max-width: 900px;
    margin: 0 auto 40px;
    text-align: center;
}

.team-overview p {
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 2;
}

.team-stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 56px;
}

/* 教授主卡片 */
.professor-card {
    background: var(--gradient-dark);
    border-radius: var(--radius-lg);
    padding: 48px;
    position: relative;
    overflow: hidden;
    color: #fff;
    margin-bottom: 40px;
}

.professor-card::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(5, 191, 219, 0.15), transparent 70%);
    border-radius: 50%;
}

.professor-header {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.professor-badge {
    flex-shrink: 0;
    width: 72px;
    height: 72px;
}

.professor-name {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 6px;
}

.professor-title {
    font-size: 15px;
    color: var(--color-accent-light);
}

.professor-intro {
    position: relative;
    z-index: 1;
}

.professor-intro p {
    font-size: 15px;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.75);
}

/* 成就卡片 */
.achievement-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

.achievement-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 32px 28px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.achievement-card-wide {
    grid-column: span 2;
}

.achievement-icon {
    width: 48px;
    height: 48px;
    background: rgba(5, 191, 219, 0.08);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary);
    margin-bottom: 20px;
    transition: var(--transition);
}

.achievement-card:hover .achievement-icon {
    background: var(--gradient-accent);
    color: #fff;
}

.achievement-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 14px;
}

.achievement-content p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* 媒体报道 */
.media-section {
    margin-top: 16px;
}

.media-section-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    margin-bottom: 20px;
}

.media-intro {
    max-width: 800px;
    margin: 0 auto 48px;
    text-align: center;
}

.media-intro p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.9;
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.media-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 28px 24px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
}

.media-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-accent);
    border-radius: 3px 0 0 3px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.media-card:hover::before {
    opacity: 1;
}

.media-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-accent);
    background: rgba(5, 191, 219, 0.08);
    padding: 4px 12px;
    border-radius: 100px;
    margin-bottom: 14px;
}

.media-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.5;
    margin-bottom: 8px;
}

.media-source {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.media-summary p {
    font-size: 13px;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================
   动画
   ============================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================
   响应式
   ============================ */
@media (max-width: 968px) {
    .product-showcase {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .team-content {
        grid-template-columns: 1fr;
    }

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

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

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

    .achievement-card-wide {
        grid-column: span 1;
    }

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

    .team-stats-row {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .contact-card {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        gap: 0;
        padding: 16px 24px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-200%);
        opacity: 0;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav-link {
        display: block;
        padding: 14px 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-cta {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .section {
        padding: 64px 0;
    }

    .hero-content {
        padding: 100px 20px 60px;
    }

    .nav-logo-img {
        width: 36px;
        height: 36px;
    }

    .footer-logo-img {
        width: 40px;
        height: 40px;
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-divider {
        display: none;
    }

    .product-features {
        grid-template-columns: 1fr;
    }

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

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

    .partnership-cta {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
    }

    .partnership-banner {
        padding: 32px 24px;
    }

    .contact-card {
        padding: 32px 24px;
    }

    .professor-card {
        padding: 32px 24px;
    }

    .professor-header {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }

    .tech-pipeline {
        padding: 24px 16px;
    }

    .pipeline-line {
        width: 40px;
    }

    .footer-links {
        gap: 32px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .team-stats {
        grid-template-columns: 1fr;
    }

    .team-stats-row {
        grid-template-columns: 1fr;
    }
}