:root {
    --primary: #0d7c3b;
    --primary-dark: #065a28;
    --primary-light: #e8f5e9;
    --primary-glow: rgba(13,124,59,0.12);
    --accent: #2196F3;
    --accent-dark: #1565C0;
    --text: #1f2937;
    --text-light: #6b7280;
    --bg: #fff;
    --bg-gray: #f5f7fa;
    --bg-dark: #1a1a2e;
    --shadow-sm: 0 1px 3px rgba(13,124,59,0.04), 0 1px 2px rgba(13,124,59,0.06);
    --shadow: 0 4px 6px rgba(13,124,59,0.04), 0 10px 25px rgba(13,124,59,0.05);
    --shadow-lg: 0 10px 25px rgba(13,124,59,0.06), 0 20px 50px rgba(13,124,59,0.08);
    --shadow-xl: 0 20px 40px rgba(13,124,59,0.08), 0 30px 70px rgba(13,124,59,0.1);
    --radius: 14px;
    --radius-sm: 10px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    line-height: 1.75;
    overflow-x: hidden;
    background: #fcfdfc;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 全局装饰底纹 */
body::before {
    content: '';
    position: fixed; inset: 0; z-index: -1;
    background:
        radial-gradient(ellipse 80% 60% at 20% 10%, rgba(13,124,59,0.02) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 30%, rgba(33,150,243,0.02) 0%, transparent 60%),
        radial-gradient(ellipse 70% 50% at 50% 80%, rgba(13,124,59,0.015) 0%, transparent 60%);
    pointer-events: none;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
    padding: 0 2rem;
}
.navbar.scrolled { border-color: #e0e0e0; box-shadow: 0 2px 12px rgba(13,124,59,0.06); }

.navbar-inner {
    max-width: 1350px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    height: 70px;
}
.navbar-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-logo { width: 38px; height: 38px; border-radius: 10px; background: linear-gradient(135deg, #0d7c3b 0%, #1db954 100%);
    display: flex; align-items: center; justify-content: center; color: #fff; flex-shrink: 0; }
.brand-logo svg { width: 22px; height: 22px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 1rem; color: var(--primary); font-weight: 700; white-space: nowrap; }
.brand-text span { font-size: 0.6rem; color: #9aa5b1; letter-spacing: 1px; }
.nav-logo {
    font-size: 1.3rem; font-weight: 700; color: var(--primary);
    text-decoration: none; display: flex; align-items: center; gap: 8px;
}
.nav-logo span { color: var(--text); font-weight: 400; font-size: 0.85rem; }
.nav-links { display: flex; list-style: none; gap: 2rem; }
.nav-links a {
    text-decoration: none; color: var(--text); font-size: 0.95rem;
    font-weight: 500; transition: color 0.2s; position: relative;
}
.nav-links a:hover { color: var(--primary); }
.nav-links a::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--primary); transition: width 0.3s;
}
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--primary); font-weight: 600; }
.nav-links a.active::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 100%; height: 2px; background: var(--primary); }
.nav-phone {
    background: linear-gradient(135deg, #0d7c3b 0%, #1db954 50%, #0d8a3f 100%);
    color: #fff; padding: 12px 24px;
    border-radius: 50px; text-decoration: none; font-weight: 600; font-size: 0.95rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(13,124,59,0.35);
}
.nav-phone:hover {
    background: linear-gradient(135deg, #065a28 0%, #169c45 50%, #0a6e32 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 22px rgba(13,124,59,0.5);
}
.mobile-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-toggle span { width: 26px; height: 2px; background: var(--text); transition: var(--transition); border-radius: 2px; }

/* ========== Hero ========== */
.hero {
    min-height: 100vh;
    background: url('images/Massive_industrial_factory_com_2026-07-20T02-38-49.png') center/cover no-repeat;
    position: relative; overflow: hidden;
    display: flex; align-items: center; justify-content: center;
    padding: 120px 2rem 80px;
}
@supports (background-attachment: fixed) {
    .hero { background-attachment: fixed; }
}
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(170deg, rgba(0,12,6,0.55) 0%, rgba(0,20,8,0.25) 40%, rgba(0,8,3,0.55) 100%);
    z-index: 0;
}
.hero::after {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 50% 40%, rgba(13,124,59,0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 30%, rgba(33,150,243,0.04) 0%, transparent 50%);
    z-index: 0;
}
.hero-shape {
    position: absolute; bottom: 0; left: 0; right: 0;
    height: 80px; background: #fff; z-index: 1;
    clip-path: ellipse(60% 100% at 50% 100%);
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 900px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(255,255,255,0.92);
    color: var(--primary-dark); padding: 10px 26px; border-radius: 50px;
    font-weight: 600; font-size: 0.9rem; margin-bottom: 1.5rem;
    backdrop-filter: blur(12px); box-shadow: 0 2px 12px rgba(13,124,59,0.08);
}
.hero-badge::before {
    content: ''; width: 8px; height: 8px; border-radius: 50%;
    background: #1db954; animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}
.hero h1 {
    font-size: 3.2rem; font-weight: 800; color: #fff; line-height: 1.25;
    margin-bottom: 1.2rem; letter-spacing: -0.5px;
    text-shadow: 0 2px 16px rgba(0,0,0,0.4);
}
.hero h1 .green { color: #a5d6a7; }
.hero-subtitle {
    font-size: 1.2rem; color: rgba(255,255,255,0.92); max-width: 800px;
    margin: 0 auto 2.5rem; line-height: 1.8;
    text-shadow: 0 1px 6px rgba(0,0,0,0.35);
}
.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn {
    padding: 14px 36px; border-radius: 50px; font-size: 1rem;
    font-weight: 600; text-decoration: none; display: inline-flex;
    align-items: center; justify-content: center; gap: 8px; transition: var(--transition); cursor: pointer; border: none;
    line-height: 1;
}
.btn-primary {
    background: linear-gradient(135deg, #0d7c3b 0%, #1db954 50%, #0d8a3f 100%);
    color: #fff; box-shadow: 0 4px 15px rgba(13,124,59,0.35);
    border: 2px solid rgba(255,255,255,0.5);
}
.btn-primary:hover {
    background: linear-gradient(135deg, #065a28 0%, #169c45 50%, #0a6e32 100%);
    box-shadow: 0 8px 28px rgba(13,124,59,0.55);
    border-color: rgba(255,255,255,0.8);
}
.btn-outline { background: rgba(255,255,255,0.15); color: #fff; border: 2px solid rgba(255,255,255,0.6); backdrop-filter: blur(6px); }
.btn-outline:hover { background: #fff; color: var(--primary); border-color: #fff; transform: translateY(-2px); }
.btn-hotline {
    background: linear-gradient(135deg, #ffb84d 0%, #ff8c00 50%, #ff6a00 100%);
    color: #fff; border: 2px solid #fff;
    font-size: 1.15rem; font-weight: 700; letter-spacing: 0.5px;
    padding: 16px 40px; position: relative; overflow: hidden;
    box-shadow: 0 6px 24px rgba(255,140,0,0.55);
    animation: hotline-glow 2s ease-in-out infinite;
}
.btn-hotline b { font-weight: 800; }
.btn-hotline .hotline-phone {
    display: inline-block;
    animation: hotline-ring 1.6s ease-in-out infinite;
    transform-origin: 60% 0;
}
.btn-hotline::after {
    content: ''; position: absolute; top: 0; bottom: 0; left: 0; width: 40%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transform: translateX(-150%) skewX(-20deg);
    animation: hotline-shine 2.8s ease-in-out infinite;
}
.btn-hotline:hover {
    background: linear-gradient(135deg, #ffa733 0%, #ff7b00 50%, #e65c00 100%);
    box-shadow: 0 10px 34px rgba(255,140,0,0.7);
    border-color: #fff; transform: translateY(-3px) scale(1.03);
}
@keyframes hotline-glow {
    0%, 100% { box-shadow: 0 6px 24px rgba(255,140,0,0.55), 0 0 0 0 rgba(255,160,0,0.6); }
    50% { box-shadow: 0 6px 24px rgba(255,140,0,0.55), 0 0 0 16px rgba(255,160,0,0); }
}
@keyframes hotline-shine {
    0% { transform: translateX(-150%) skewX(-20deg); }
    55% { transform: translateX(250%) skewX(-20deg); }
    100% { transform: translateX(250%) skewX(-20deg); }
}
@keyframes hotline-ring {
    0%, 60%, 100% { transform: rotate(0); }
    10% { transform: rotate(-18deg); }
    20% { transform: rotate(16deg); }
    30% { transform: rotate(-12deg); }
    40% { transform: rotate(8deg); }
    50% { transform: rotate(-4deg); }
}

.hero-stats {
    display: flex; gap: 3rem; justify-content: center; margin-top: 4rem; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2.5rem; font-weight: 800; color: #fff; text-shadow: 0 2px 6px rgba(0,0,0,0.3); }
.hero-stat .label { font-size: 0.9rem; color: rgba(255,255,255,0.8); margin-top: 4px; }

/* ========== Section 通用 ========== */
.section { padding: 45px 2rem; }
.section-gray { background: linear-gradient(180deg, #f5f7fa 0%, #f0f4f2 100%); }
.section-container { max-width: 1350px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block; background: var(--primary-light);
    color: var(--primary); padding: 6px 18px; border-radius: 50px;
    font-weight: 600; font-size: 0.85rem; margin-bottom: 1rem;
    letter-spacing: 2px;
}
.section-title { font-size: 2.2rem; font-weight: 700; color: #1a1a2e; margin-bottom: 0.8rem; letter-spacing: -0.3px; }
.section-title span { color: var(--primary); position: relative; }
.section-title span::after {
    content: '';
    position: absolute; left: 0; bottom: 3px; width: 100%; height: 7px;
    background: rgba(13,124,59,0.1); border-radius: 4px; z-index: -1;
}
.section-desc { color: var(--text-light); font-size: 1.05rem; max-width: 650px; margin: 0 auto; }

/* ========== 关于我们 ========== */
.about-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: stretch;
}
.about-image {
    position: relative; border-radius: var(--radius); overflow: hidden; height: 100%; min-height: 420px;
    box-shadow: var(--shadow-lg);
}
.about-image .img-bg {
    width: 100%; height: 100%;
    background: url('images/about-us.jpg') center/cover no-repeat;
    border-radius: var(--radius);
    position: relative;
}
.about-image .img-bg::after {
    content: '';
    position: absolute; inset: 0;
    background: rgba(13,124,59,0.08);
    border-radius: var(--radius);
}
.about-image .img-overlay {
    position: absolute; bottom: 20px; right: -20px;
    background: #fff; padding: 24px 28px; border-radius: var(--radius);
    box-shadow: var(--shadow-lg); border: 1px solid #eef2f0;
}
.about-image .img-overlay .big { font-size: 2rem; font-weight: 800; color: var(--primary); }
.about-image .img-overlay .txt { color: var(--text-light); font-size: 0.9rem; }

.about-content .about-tag { display: inline-block; background: var(--primary-light); color: var(--primary); padding: 6px 16px; border-radius: 50px; font-weight: 600; font-size: 0.85rem; margin-bottom: 1rem; }
/* .about-tag 复用 .section-tag 的视觉风格，定义在 .section-tag 中 */
.about-content h2 { font-size: 2rem; font-weight: 700; margin-bottom: 1rem; color: #1a1a2e; }
.about-content p { color: var(--text-light); margin-bottom: 1rem; line-height: 1.8; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.about-feature {
    display: flex; align-items: flex-start; gap: 12px; padding: 18px;
    background: #fff; border-radius: var(--radius-sm); border: 1px solid #eef2f0;
    box-shadow: var(--shadow-sm); transition: var(--transition);
}
.about-feature:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: #d4e8d9;
}
.about-feature .icon {
    width: 44px; height: 44px; border-radius: 10px;
    background: var(--primary-light); display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; flex-shrink: 0;
}
.about-feature h4 { font-size: 0.95rem; margin-bottom: 2px; }
.about-feature p { font-size: 0.85rem; margin: 0; color: #888; }

/* ========== 资质 ========== */
.cert-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.cert-card {
    background: #fff; padding: 0; border-radius: var(--radius);
    text-align: center; box-shadow: var(--shadow-sm); transition: var(--transition); border: 1px solid #eef2f0;
    overflow: hidden;
}
.cert-card:hover {
    border-color: var(--primary); transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}
.cert-img {
    width: 100%; height: 240px; overflow: hidden;
    display: flex; align-items: center; justify-content: center;
    background: #f9faf9;
}
.cert-img img {
    width: 100%; height: 100%; object-fit: contain;
    transition: transform 0.5s ease;
}
.cert-card:hover .cert-img img { transform: scale(1.05); }
.cert-card h4 {
    font-size: 0.9rem; color: #333; padding: 14px 10px; margin: 0;
}

/* ========== 服务产品 ========== */
.services-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.service-card {
    display: block; text-decoration: none; color: inherit;
    background: #fff; border-radius: var(--radius); padding: 36px 28px;
    box-shadow: var(--shadow-sm); transition: var(--transition);
    border: 1px solid #eef2f0; position: relative; overflow: hidden;
}
.service-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, #1db954 100%); transform: scaleX(0);
    transition: transform 0.5s cubic-bezier(0.4,0,0.2,1); transform-origin: left;
}
.service-card:hover {
    border-color: #d4e8d9; transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
    height: 160px; border-radius: var(--radius) var(--radius) 0 0;
    margin: -36px -28px 20px -28px; overflow: hidden;
    width: calc(100% + 56px); position: relative;
}
.service-icon::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.35) 100%);
    pointer-events: none;
}
.service-icon img {
    width: 100%; height: 100%; object-fit: cover; display: block;
    transition: transform 0.5s ease;
}
.service-card:hover .service-icon img { transform: scale(1.08); }
.service-card h3 { font-size: 1.15rem; margin-bottom: 10px; color: #1a1a2e; }
.service-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.7; }
.service-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.service-tag { background: #e8f5eb; padding: 4px 12px; border-radius: 20px; font-size: 0.8rem; color: #2d7a3e; }

/* ========== 行业方案 ========== */
.industry-grid {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 24px;
}
.industry-card {
    text-decoration: none; color: inherit; position: relative;
    background: #fff; border-radius: var(--radius); padding: 32px 28px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid #eef2f0;
    display: flex; flex-direction: column;
}
.industry-card:hover {
    border-color: var(--primary); transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(180deg, #fff 0%, var(--primary-light) 100%);
}
.industry-card .ind-icon { font-size: 2.4rem; margin-bottom: 16px; display: block; }
.industry-card h4 { font-size: 1.1rem; color: #1a1a2e; margin-bottom: 10px; }
.industry-card p {
    font-size: 0.88rem; color: var(--text-light); line-height: 1.7; margin-bottom: 14px;
}
.ind-tag { display: inline-block; background: #e8f5eb; color: #2d7a3e; padding: 4px 12px; border-radius: 20px; font-size: 0.78rem; font-weight: 500; margin-top: auto; align-self: flex-start; }

/* ========== 工程案例轮播 ========== */
.cases-carousel { position: relative; }
.cases-viewport {
    overflow: hidden;
    padding: 8px 0 48px;
    margin-bottom: -48px;
}
.cases-track {
    display: flex;
    transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}
.cases-group {
    flex: 0 0 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}
.case-card {
    background: #fff; border-radius: var(--radius); overflow: hidden;
    box-shadow: 0 1px 2px rgba(13,124,59,0.04);
    transition: var(--transition);
    border: 1px solid #eef2f0;
    display: block; text-decoration: none; color: inherit;
}
.case-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 30px rgba(13,124,59,0.1), 0 2px 6px rgba(13,124,59,0.06);
    border-color: #d4e8d9;
}
.case-img {
    height: 200px; display: flex; align-items: center; justify-content: center;
    font-size: 3rem; color: #fff; overflow: hidden;
}
.case-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.case-card:hover .case-img img { transform: scale(1.06); }
.case-body { padding: 24px; }
.case-body .case-client { font-size: 0.85rem; color: var(--primary); font-weight: 600; margin-bottom: 6px; }
.case-body h4 { font-size: 1.1rem; color: #1a1a2e; margin-bottom: 8px; }
.case-body p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; }
/* 导航 */
.cases-nav {
    display: flex; align-items: center; justify-content: center;
    gap: 10px; margin-top: 28px;
}
.cases-dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: #d4d8d4; border: none; cursor: pointer;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
}
.cases-dot.active {
    width: 28px; border-radius: 5px; background: var(--primary);
}
.cases-dot:hover { background: #a0b8a4; }
.cases-dot.active:hover { background: var(--primary-dark); }

/* ========== 客户logo ========== */
.client-logos {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px;
    padding: 20px 0; max-width: 85%; margin: 0 auto;
}
.client-card {
    display: flex; flex-direction: column; align-items: center; gap: 12px;
    padding: 24px 12px; background: #fff; border-radius: var(--radius);
    box-shadow: var(--shadow-sm); transition: var(--transition);
    border: 1px solid #eef2f0;
}
.client-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(13,124,59,0.1);
    border-color: #d4e8d9;
}
.client-card-img {
    width: 70px; height: 70px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.client-card-img img { width: 100%; height: 100%; object-fit: contain; padding: 0; }
.client-card-name {
    font-weight: 700; color: #333; font-size: 0.85rem; text-align: center;
}

/* ========== 常见问题 ========== */
.faq-list { max-width: 900px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid #e8ece9; transition: var(--transition); }
.faq-item:first-child { border-top: 1px solid #e8ece9; }
.faq-item:hover { background: rgba(13,124,59,0.02); }
.faq-question {
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    padding: 22px 8px; background: none; border: none; cursor: pointer;
    font-size: 1.05rem; font-weight: 600; color: #1a1a2e; text-align: left;
    transition: color 0.3s;
}
.faq-item:hover .faq-question { color: var(--primary); }
.faq-question:hover { color: var(--primary); }
.faq-icon {
    font-size: 1.4rem; font-weight: 300; color: #999; transition: transform 0.3s;
    flex-shrink: 0; margin-left: 16px;
}
.faq-item.active .faq-icon { transform: rotate(45deg); color: var(--primary); }
.faq-answer {
    max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-answer p {
    padding: 0 0 20px; color: #666; font-size: 0.95rem; line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 800px; }

/* ========== 联系方式 ========== */
.contact-wrapper {
    display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: stretch;
}
.contact-info { }
.contact-info-inner {
    flex: 1; background: #fff; border-radius: var(--radius); padding: 36px 36px 24px;
    box-shadow: var(--shadow-sm); border: 1px solid #eef2f0;
    display: flex; flex-direction: column; justify-content: center;
}
.contact-info h2 { font-size: 2rem; font-weight: 700; margin-bottom: 1rem; color: #1a1a2e; }
.contact-info > p { color: var(--text-light); margin-bottom: 2rem; }
.contact-items { display: flex; flex-direction: column; gap: 16px; margin-bottom: 2rem; }
.contact-item {
    display: flex; align-items: center; gap: 14px; padding: 14px 18px;
    background: #fafbfa; border-radius: var(--radius-sm); border: 1px solid #eef2f0;
    transition: var(--transition);
}
.contact-item:hover {
    background: #fff; border-color: #d4e8d9; box-shadow: var(--shadow-sm);
    transform: translateX(4px);
}
.contact-item .ci-icon {
    width: 44px; height: 44px; border-radius: 10px;
    background: var(--primary-light); display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; flex-shrink: 0;
}
.contact-item .ci-text strong { display: block; font-size: 0.9rem; color: #1a1a2e; }
.contact-item .ci-text span { font-size: 0.85rem; color: var(--text-light); }
.contact-form { background: #fff; padding: 36px 36px 24px; border-radius: var(--radius); box-shadow: var(--shadow-sm); border: 1px solid #eef2f0; }
.contact-form h3 { font-size: 1.3rem; margin-bottom: 20px; color: #1a1a2e; }
/* 表单提交结果提示 */
.form-success, .form-error { text-align: center; padding: 32px 16px 24px; }
.result-icon { width: 56px; height: 56px; margin: 0 auto 14px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; font-weight: 700; }
.form-success .result-icon { background: #e8f7ee; color: #16a34a; }
.form-error .result-icon { background: #fdeaea; color: #dc2626; }
.form-success h3, .form-error h3 { font-size: 1.25rem; margin-bottom: 10px; color: #1a1a2e; }
.form-success p, .form-error p { color: #5b6670; line-height: 1.7; margin-bottom: 16px; font-size: 0.95rem; }
.form-success .form-submit, .form-error .form-submit { margin-top: 6px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: #555; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 12px 16px; border: 1.5px solid #c8e0ce;
    border-radius: var(--radius-sm); font-size: 0.95rem; font-family: inherit;
    transition: var(--transition); background: #fff;
}
.form-group input:hover, .form-group textarea:hover, .form-group select:hover {
    border-color: #a8d4b2;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none; border-color: var(--primary); background: #fff;
    box-shadow: 0 0 0 4px rgba(13,124,59,0.06), 0 2px 8px rgba(13,124,59,0.08);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit { width: 100%; padding: 16px 28px; font-size: 1.05rem; }

/* ========== Footer ========== */
.footer {
    background: #12162a; color: #c2c5d0; padding: 50px 2rem 30px;
    position: relative;
}
.footer::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, #1db954 50%, var(--primary) 100%);
}
.footer-grid {
    max-width: 1350px; margin: 0 auto;
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
    margin-bottom: 40px;
}
.footer h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer p { font-size: 0.88rem; line-height: 1.7; }
.footer a { color: #aaa; text-decoration: none; font-size: 0.88rem; transition: color 0.2s; display: block; margin-bottom: 8px; }
.footer a:hover { color: #81c784; }
.footer-bottom {
    max-width: 1350px; margin: 0 auto; padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center; font-size: 0.85rem; color: #888;
}

/* ========== 回到顶部 ========== */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px;
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, #1db954 100%);
    color: #fff; border: none;
    cursor: pointer; font-size: 1.3rem; box-shadow: 0 4px 18px rgba(13,124,59,0.35);
    transition: var(--transition); opacity: 0; pointer-events: none;
    display: flex; align-items: center; justify-content: center;
    z-index: 999;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #169c45 100%);
    transform: translateY(-4px);
    box-shadow: 0 6px 24px rgba(13,124,59,0.5);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .industry-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .client-logos { grid-template-columns: repeat(4, 1fr); max-width: 95%; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero-stats { gap: 1.5rem; }
    .hero-stat .num { font-size: 2rem; }
    .section { padding: 60px 1.2rem; }
    .section-title { font-size: 1.6rem; }
    .about-grid, .contact-wrapper { grid-template-columns: 1fr; gap: 40px; }
    .services-grid { grid-template-columns: 1fr; }
    .cases-group { grid-template-columns: repeat(2, 1fr); }
    .client-logos { grid-template-columns: repeat(3, 1fr); max-width: 100%; }
    .industry-grid { grid-template-columns: 1fr; }
    .cert-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .about-features { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .brand-text strong { font-size: 0.8rem; }
    .nav-phone { display: none; }
    .nav-links { display: none; }
    .mobile-toggle { display: flex; }
    .nav-links.active {
        display: flex; flex-direction: column; position: absolute;
        top: 70px; left: 0; right: 0; background: #fff;
        padding: 20px 2rem; border-bottom: 1px solid #e0e0e0;
        box-shadow: 0 4px 12px rgba(13,124,59,0.08);
    }
    .navbar { padding: 0 1rem; }
}
@media (max-width: 480px) {
    .hero h1 { font-size: 1.6rem; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; }
    .cases-group { grid-template-columns: 1fr; }
    .industry-grid { grid-template-columns: 1fr; }
    .client-logos { grid-template-columns: repeat(3, 1fr); max-width: 100%; }
    .cert-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
}