/* ========== 技术优势页 - 苹果风格 ========== */

/* 全局 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #ffffff;
    color: #1d1d1f;
    line-height: 1.5;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 18px 30px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-brand .logo {
    height: 70px;
    width: auto;
}

.brand-text {
    font-size: 14px;
    font-weight: 600;
    color: #1d1d1f;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 45px;
    align-items: center;
}

.nav-menu a {
    color: #1d1d1f;
    text-decoration: none;
    font-size: 0.95em;
    font-weight: 500;
    letter-spacing: 0.5px;
    opacity: 0.8;
    transition: all 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    opacity: 1;
}

.btn-contact {
    background: #0071e3;
    color: #ffffff !important;
    padding: 4px 12px;
    border-radius: 980px;
}

/* Hero */
.tech-hero {
    padding: 120px 0 60px;
    text-align: center;
    background: #ffffff;
}

.tech-hero h1 {
    font-size: 56px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 12px 0;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 24px;
    color: #86868b;
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
}

/* Stats Section */
.stats-section {
    padding: 80px 0;
    background: #f5f5f7;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    max-width: 980px;
    margin: 0 auto;
    padding: 0 22px;
}

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

.stat-value {
    font-size: 48px;
    font-weight: 600;
    color: #1d1d1f;
    display: block;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: #86868b;
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    font-size: 48px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 12px 0;
}

.section-header p {
    font-size: 21px;
    color: #86868b;
    margin: 0;
}

/* Core Tech */
.core-tech {
    padding: 100px 0;
    background: #ffffff;
}

.core-tech .container {
    max-width: 980px;
    padding: 0 22px;
}

.tech-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 40px;
    padding: 60px 0;
    border-bottom: 1px solid #d2d2d7;
}

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

.tech-number {
    font-size: 14px;
    font-weight: 600;
    color: #86868b;
}

.tech-content h3 {
    font-size: 40px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 16px 0;
}

.tech-desc {
    font-size: 21px;
    color: #86868b;
    line-height: 1.5;
    margin: 0 0 30px 0;
}

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

.tech-list li {
    font-size: 17px;
    color: #1d1d1f;
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.tech-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #0071e3;
}

/* Temperature Visual */
.temp-visual-container {
    margin: 30px 0;
    padding: 0;
}

.temp-bar {
    background: #f5f5f7;
    border-radius: 12px;
    padding: 32px 24px 24px;
    position: relative;
}

.temp-range {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.temp-min {
    font-size: 28px;
    font-weight: 600;
    color: #0071e3;
}

.temp-max {
    font-size: 28px;
    font-weight: 600;
    color: #ff3b30;
}

.temp-gradient {
    height: 24px;
    border-radius: 12px;
    display: flex;
    overflow: hidden;
}

.temp-segment {
    flex: 1;
}

.temp-segment.cold {
    background: linear-gradient(90deg, #0071e3 0%, #5ac8fa 100%);
}

.temp-segment.normal {
    background: linear-gradient(90deg, #5ac8fa 0%, #34c759 100%);
}

.temp-segment.hot {
    background: linear-gradient(90deg, #34c759 0%, #ff3b30 100%);
}

.temp-note {
    text-align: center;
    font-size: 14px;
    color: #86868b;
    margin: 16px 0 0 0;
}

/* Tech Specs */
.tech-specs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.spec {
    background: #f5f5f7;
    padding: 24px;
    border-radius: 12px;
    text-align: center;
}

.spec-value {
    font-size: 32px;
    font-weight: 600;
    color: #0071e3;
    display: block;
    margin-bottom: 8px;
}

.spec-label {
    font-size: 14px;
    color: #86868b;
}

/* Sensors Section */
.sensors-section {
    padding: 100px 0;
    background: #f5f5f7;
}

.sensors-section .container {
    max-width: 980px;
    padding: 0 22px;
}

.sensor-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.sensor-card {
    background: #ffffff;
    padding: 32px 24px;
    border-radius: 12px;
    text-align: center;
}

.sensor-card h4 {
    font-size: 17px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 8px 0;
}

.sensor-card p {
    font-size: 14px;
    color: #86868b;
    margin: 0;
}

/* CTA */
.tech-cta {
    padding: 100px 0;
    background: #ffffff;
    text-align: center;
}

.tech-cta h2 {
    font-size: 40px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 12px 0;
}

.tech-cta p {
    font-size: 21px;
    color: #86868b;
    margin: 0 0 40px 0;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 17px;
    font-weight: 500;
    text-decoration: none;
    border-radius: 980px;
    transition: all 0.3s;
}

.btn-primary {
    background: #0071e3;
    color: #ffffff;
}

.btn-primary:hover {
    background: #0077ed;
}

.btn-secondary {
    background: #f5f5f7;
    color: #1d1d1f;
}

.btn-secondary:hover {
    background: #e8e8ed;
}

/* Footer */
.footer {
    background: #f5f5f7;
    padding: 60px 0 30px;
    border-top: 1px solid #d2d2d7;
}

.footer .container {
    max-width: 980px;
    padding: 0 22px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 12px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 12px 0;
}

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

.footer-col ul li {
    font-size: 12px;
    color: #86868b;
    padding: 6px 0;
}

.footer-col ul li a {
    color: #86868b;
    text-decoration: none;
}

.footer-col ul li a:hover {
    color: #0071e3;
}

.footer-bottom {
    border-top: 1px solid #d2d2d7;
    padding-top: 20px;
}

.footer-bottom p {
    font-size: 11px;
    color: #86868b;
    margin: 0;
}

/* Responsive */
@media (max-width: 980px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tech-item {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .tech-number {
        margin-bottom: 10px;
    }
    
    .tech-content h3 {
        font-size: 32px;
    }
    
    .tech-specs {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }
    
    .spec-value {
        font-size: 24px;
    }
    
    .sensor-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .tech-hero h1 {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 19px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .stat-value {
        font-size: 36px;
    }
    
    .section-header h2 {
        font-size: 36px;
    }
    
    .section-header p {
        font-size: 17px;
    }
    
    .tech-content h3 {
        font-size: 28px;
    }
    
    .tech-desc {
        font-size: 17px;
    }
    
    .tech-specs {
        grid-template-columns: 1fr;
    }
    
    .sensor-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}