* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

:root {
    --main-color: #24bb9d;
    --dark-color: #1a1a1a;
    --light-bg: #f7f9f8;
    --gray-text: #666;
}

body {
    color: #333;
    line-height: 1.7;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 70px 0;
}

h2 {
    font-size: 32px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--dark-color);
    position: relative;
}

h2::after {
    content: "";
    width: 60px;
    height: 4px;
    background: var(--main-color);
    display: block;
    margin: 12px auto 0;
    border-radius: 2px;
}

/* Banner */
.banner-section {
    width: 100%;
    position: relative;
}
.banner {
    width: 100%;
    min-height: 720px;
    height: 37.5vw;
    max-height: 1080px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    text-align: left;
}
.banner-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}
.banner-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
}
.banner-mask {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 2;
}
.banner-content {
    position: relative;
    z-index: 3;
    width: 100%;
    max-width: 2560px;
    padding: 0 30px;
    margin-left: 25%;
}
.banner-title {
    font-size: clamp(32px, 3vw, 72px);
    font-weight: 700;
    margin-bottom: clamp(10px, 1.5vw, 30px);
    line-height: 1.2;
    white-space: nowrap;
    color: #fff !important;
}
.banner-subtitle {
    font-size: clamp(18px, 1.5vw, 32px);
    font-weight: 400;
    opacity: 0.95;
    line-height: 1.5;
    white-space: nowrap;
    color: #fff !important;
}

/* 行业模块 */
.industry {
    background: #fff;
}
.industry-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    font-size: 18px;
    color: var(--gray-text);
    line-height: 1.9;
}
.industry-image-box {
    margin-top: 40px;
    text-align: center;
}
.industry-img {
    max-width: 900px;
    width: 100%;
    height: auto;
    aspect-ratio: 3/2;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.07);
    display: block;
    margin: 0 auto;
}

/* 优势模块 */
.advantages {
    background: var(--light-bg);
}
.adv-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 20px;
}
.adv-item {
    background: white;
    padding: 40px 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    text-align: center;
    transition: 0.3s;
}
.adv-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(36,187,157,0.12);
}
.local-icon {
    width: 42px;
    height: 42px;
    margin-bottom: 20px;
}
.adv-item h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #222;
}
.adv-item p {
    color: var(--gray-text);
    font-size: 15px;
}

/* 应用领域 */
.applications {
    background: #fff;
}
.app-desc {
    text-align: center;
    font-size: 18px;
    color: var(--gray-text);
    margin-bottom: 50px;
}
.app-icons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
}
.app-item {
    text-align: center;
    width: 140px;
}
.app-svg {
    width: 40px;
    height: 40px;
    margin-bottom: 12px;
}
.app-item p {
    font-size: 16px;
    color: #333;
}

/* FAQ */
.section.faq {
    background: #ffffff;
}
.faq-item {
    background: white;
    margin-bottom: 15px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #eee;
}
.faq-question {
    padding: 20px;
    background: #fff;
    color: #222;
    font-weight: bold;
    cursor: pointer;
}
.faq-answer {
    padding: 20px;
    color: #555;
    line-height: 1.7;
    display: none;
    border-top: 1px solid #eee;
}
.faq-item.active .faq-answer {
    display: block;
}

/* CTA */
.cta {
    background: var(--main-color);
    color: white;
    text-align: center;
    padding: 60px 0;
}
.cta h2 {
    color: white;
    font-size: 32px;
    margin-bottom: 30px;
}
.cta h2::after {
    background: white;
}
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}
.cta-btn {
    padding: 14px 36px;
    background: white;
    color: var(--main-color);
    border-radius: 50px;
    font-size: 16px;
    font-weight: bold;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}
.cta-btn:hover {
    background: #f0f0f0;
    transform: scale(1.05);
}

/* 响应式 */
@media (min-width: 2560px) {
    .container { max-width: 1400px; }
}
@media (min-width: 3840px) {
    .container { max-width: 1600px; }
}
@media (max-width: 992px) {
    .adv-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 768px) {
    .banner {
        min-height: 500px;
        height: auto;
    }
    .banner-content {
        margin-left: 0;
        padding: 60px 20px;
    }
    .banner-title,
    .banner-subtitle {
        white-space: inherit;
    }
    .adv-grid { grid-template-columns: 1fr; }
    h2 { font-size: 28px; }
    section { padding: 50px 0; }
    .industry-image-box {
        margin-top: 30px;
    }
}
@media (max-width: 480px) {
    .banner-title { font-size: 28px; }
    .banner-subtitle { font-size: 16px; }
}