/* ============================
   主题变量 - 高端中医药风格
   ============================ */
:root {
    --primary: #0d5c45;
    --primary-dark: #094535;
    --primary-light: #14785c;
    --primary-bg: #f0f7f4;
    --gold: #bfa15f;
    --gold-light: #d4bc85;
    --gold-bg: #faf7f0;
    --dark: #1a2e29;
    --dark-2: #2d4239;
    --gray: #6b7c75;
    --gray-light: #9ba8a2;
    --gray-bg: #f7f6f3;
    --border: #e5e2dc;
    --white: #ffffff;
    --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --shadow-sm: 0 1px 4px rgba(13, 92, 69, 0.04);
    --shadow: 0 4px 16px rgba(13, 92, 69, 0.08);
    --shadow-lg: 0 16px 40px rgba(13, 92, 69, 0.12);
    --radius: 8px;
    --radius-lg: 14px;
    --transition: all 0.35s ease;
    --container-max: 1200px;
    --header-height: 64px;
}

/* ============================
   基础重置
   ============================ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    color: var(--dark-2);
    background: var(--white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { border: none; cursor: pointer; background: none; font-family: inherit; }
img { max-width: 100%; display: block; }

/* ============================
   通用布局
   ============================ */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 32px; }
section { padding: 90px 0; }

/* ============================
   按钮
   ============================ */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 14px 44px; font-size: 0.95rem; font-weight: 500;
    border-radius: var(--radius); transition: var(--transition);
    cursor: pointer; letter-spacing: 1px;
}
.btn-hero {
    background: transparent; color: var(--white);
    border: 1.5px solid rgba(255, 255, 255, 0.6); font-weight: 500;
}
.btn-hero:hover {
    background: var(--white); color: var(--primary); border-color: var(--white);
}

/* ============================
   导航栏
   ============================ */
.header {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--header-height); z-index: 1000;
    background: var(--white); transition: var(--transition);
}
.header.scrolled { box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06); }
.nav-container {
    display: flex; align-items: center; justify-content: space-between;
    height: var(--header-height);
}
.logo { display: flex; align-items: center; gap: 8px; color: var(--primary); }
/* IE兼容：显式设置宽高 */
.logo-img {
    height: 32px;
    width: auto;
    max-height: 32px;
    max-width: 120px;
    border-radius: 3px;
    object-fit: contain;
}
.logo-text { font-size: 1.1rem; font-weight: 700; letter-spacing: 2px; }

.nav-list { display: flex; gap: 30px; }
.nav-link {
    font-size: 0.9rem; font-weight: 500; color: var(--dark-2);
    position: relative; padding: 6px 0; transition: var(--transition);
}
.nav-link::after {
    content: ''; position: absolute; bottom: -2px; left: 50%;
    width: 0; height: 2px; background: var(--gold);
    transition: width 0.3s ease, left 0.3s ease;
}
.nav-link:hover, .nav-link.active { color: var(--primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; left: 0; }

/* 移动端菜单 */
.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.menu-toggle span { width: 22px; height: 2px; background: var(--dark); border-radius: 2px; transition: var(--transition); }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================
   首页 Banner
   ============================ */
.hero {
    margin-top: var(--header-height); padding: 0;
    height: 600px; display: flex; align-items: center;
    position: relative; overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0;
    background: linear-gradient(135deg, #094535 0%, #0d5c45 40%, #14785c 100%);
}
.hero-bg::after {
    content: ''; position: absolute; inset: 0;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(191, 161, 95, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 50%, rgba(255, 255, 255, 0.04) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 2; text-align: center; color: var(--white); }
.hero-title {
    font-size: 2.8rem; font-weight: 700; margin-bottom: 20px;
    letter-spacing: 8px; text-shadow: 0 2px 30px rgba(0, 0, 0, 0.15);
}
.hero-line { width: 50px; height: 2px; background: var(--gold); margin: 0 auto 24px; }
.hero-slogan { font-size: 1.3rem; color: var(--gold-light); margin-bottom: 10px; font-weight: 400; letter-spacing: 6px; }
.hero-sub { font-size: 0.9rem; color: rgba(255, 255, 255, 0.6); margin-bottom: 40px; letter-spacing: 3px; }

/* ============================
   Section Header
   ============================ */
.section-header { text-align: center; margin-bottom: 60px; }
.section-title { font-size: 1.9rem; font-weight: 700; color: var(--dark); margin-bottom: 16px; letter-spacing: 4px; }
.section-line { width: 40px; height: 2px; background: var(--gold); margin: 0 auto; border-radius: 1px; }
.section-subtitle { margin-top: 18px; font-size: 0.92rem; color: var(--gray); }

/* ============================
   关于我们
   ============================ */
.about { background: var(--white); }
.about-content { display: grid; grid-template-columns: 1.3fr 1fr; gap: 60px; align-items: center; }
.about-text p { color: var(--dark-2); margin-bottom: 20px; line-height: 2.1; font-size: 0.95rem; text-indent: 2em; }
.about-image { position: relative; }
.about-img { width: 100%; border-radius: var(--radius-lg); box-shadow: 0 12px 36px rgba(13, 92, 69, 0.12); }

/* ============================
   企业文化 - 图片展示
   ============================ */
.culture { background: var(--gray-bg); }
.culture-image { text-align: center; }
.culture-img {
    max-width: 100%; margin: 0 auto; border-radius: var(--radius-lg);
    box-shadow: 0 8px 28px rgba(13, 92, 69, 0.1);
}

/* ============================
   社会贡献
   ============================ */
.contribution { background: var(--white); }
.contrib-banner { text-align: center; margin-bottom: 50px; }
.contrib-banner-img {
    max-width: 100%; max-height: 280px; margin: 0 auto;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 28px rgba(13, 92, 69, 0.1);
}
.contribution-content { display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; align-items: center; }
.contribution-image { text-align: center; }
.contribution-img {
    max-width: 100%; margin: 0 auto; border-radius: var(--radius-lg);
    box-shadow: 0 8px 28px rgba(13, 92, 69, 0.1);
}
.contribution-text p { color: var(--dark-2); margin-bottom: 20px; line-height: 2.1; font-size: 0.95rem; text-indent: 2em; }
.cert-image { text-align: center; margin: 16px 0 24px; }
.cert-img {
    max-width: 100%; max-height: 220px; margin: 0 auto;
    border-radius: var(--radius);
    box-shadow: 0 4px 16px rgba(13, 92, 69, 0.1);
}

/* ============================
   企业发展
   ============================ */
.development { background: var(--gray-bg); }
.dev-image { text-align: center; margin-bottom: 50px; }
.dev-img {
    max-width: 100%; margin: 0 auto; border-radius: var(--radius-lg);
    box-shadow: 0 8px 28px rgba(13, 92, 69, 0.1);
}
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 40px; }
.timeline::before { content: ''; position: absolute; left: 12px; top: 0; bottom: 0; width: 1px; background: var(--border); }
.timeline-item { position: relative; padding-bottom: 44px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
    content: ''; position: absolute; left: -34px; top: 6px;
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--white); border: 2px solid var(--gold);
    box-shadow: 0 0 0 3px var(--white);
}
.timeline-year { font-size: 1.6rem; font-weight: 800; color: var(--primary); margin-bottom: 6px; letter-spacing: 1px; }
.timeline-content h3 { font-size: 1.1rem; font-weight: 600; color: var(--dark); margin-bottom: 6px; }
.timeline-content p { font-size: 0.9rem; color: var(--gray); }

/* ============================
   企业实力
   ============================ */
.advantages { background: var(--white); }
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.advantage-card {
    background: var(--gray-bg); border-radius: var(--radius-lg);
    padding: 42px 24px; text-align: center;
    transition: var(--transition); border: 1px solid var(--border);
}
.advantage-card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(13, 92, 69, 0.1); border-color: var(--gold-light); }
.advantage-icon {
    width: 60px; height: 60px; background: var(--primary); color: var(--white);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    margin: 0 auto 20px; transition: var(--transition);
}
.advantage-icon svg { width: 30px; height: 30px; }
.advantage-card:hover .advantage-icon { background: var(--gold); }
.advantage-title { font-size: 1.05rem; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.advantage-desc { font-size: 0.86rem; color: var(--gray); line-height: 1.8; }

/* ============================
   厂房设施 - 图文居中对齐
   ============================ */
.facilities { background: var(--gray-bg); }
.facilities-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.facility-card {
    background: var(--white); border-radius: var(--radius-lg);
    overflow: hidden; transition: var(--transition);
    box-shadow: 0 2px 12px rgba(13, 92, 69, 0.04);
    display: flex; flex-direction: column;
}
.facility-card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(13, 92, 69, 0.1); }
.facility-img { height: 240px; overflow: hidden; display: flex; align-items: center; justify-content: center; }
.facility-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.facility-card:hover .facility-img img { transform: scale(1.05); }
.facility-body { padding: 28px 30px; text-align: center; flex: 1; display: flex; flex-direction: column; justify-content: center; }
.facility-body h3 { font-size: 1.15rem; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.facility-body p { font-size: 0.9rem; color: var(--gray); line-height: 1.9; }

/* ============================
   产品展示 - 图文居中对齐
   ============================ */
.products { background: var(--white); }
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.product-card {
    background: var(--gray-bg); border-radius: var(--radius-lg);
    overflow: hidden; transition: var(--transition);
    box-shadow: 0 2px 12px rgba(13, 92, 69, 0.04);
    display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(13, 92, 69, 0.1); }
.product-img {
    height: 200px; display: flex; align-items: center; justify-content: center;
    padding: 20px; background: var(--white);
}
.product-img img { max-height: 100%; max-width: 100%; object-fit: contain; }
.product-body { padding: 24px 28px; text-align: center; border-top: 1px solid var(--border); flex: 1; }
.product-name {
    font-size: 1.2rem; font-weight: 700; color: var(--primary);
    margin-bottom: 10px; padding-bottom: 10px; border-bottom: 1px solid var(--border);
}
.product-func { font-size: 0.86rem; color: var(--gray); line-height: 1.9; }

/* ============================
   合作伙伴 - 高端设计
   ============================ */
.partners { background: var(--gray-bg); }
.partners-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.partner-item {
    background: var(--white); border-radius: var(--radius); padding: 28px 20px;
    font-size: 0.9rem; font-weight: 600; color: var(--dark-2); text-align: center;
    transition: var(--transition); border: 1px solid var(--border);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    min-height: 80px; line-height: 1.5;
}
.partner-item:hover {
    background: var(--primary); color: var(--white); border-color: var(--primary);
    transform: translateY(-4px); box-shadow: 0 8px 24px rgba(13, 92, 69, 0.15);
}

/* ============================
   页脚
   ============================ */
.footer { background: var(--dark); color: rgba(255, 255, 255, 0.65); padding: 60px 0 0; }
.footer-content { display: grid; grid-template-columns: 1.5fr 1fr; gap: 60px; padding-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
/* IE兼容：显式设置宽高 */
.footer-logo-img {
    height: 28px; width: auto; max-height: 28px; max-width: 100px;
    border-radius: 4px; object-fit: contain;
}
.footer-company { font-size: 1rem; font-weight: 700; color: var(--white); letter-spacing: 2px; }
.footer-desc { font-size: 0.86rem; line-height: 1.9; margin-bottom: 20px; color: rgba(255, 255, 255, 0.55); }
.footer-title {
    font-size: 1.05rem; font-weight: 600; color: var(--white); margin-bottom: 24px;
    padding-bottom: 12px; border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: inline-block; letter-spacing: 2px;
}
.contact-list li { margin-bottom: 14px; font-size: 0.9rem; }
.map-container {
    margin-top: 20px;
}
.map-embed {
    width: 100%;
    height: 240px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.map-embed iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}
.map-link {
    display: inline-block;
    margin-top: 8px;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}
.map-link:hover {
    color: var(--gold-light);
}
.contact-label { color: rgba(255, 255, 255, 0.4); }
.contact-value { color: rgba(255, 255, 255, 0.75); }
.quick-links li { margin-bottom: 12px; }
.quick-links a { font-size: 0.9rem; color: rgba(255, 255, 255, 0.65); transition: var(--transition); }
.quick-links a:hover { color: var(--gold-light); padding-left: 4px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.08); padding: 24px 0; text-align: center; font-size: 0.84rem; color: rgba(255, 255, 255, 0.35); }

/* ============================
   返回顶部
   ============================ */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px;
    width: 42px; height: 42px; background: var(--primary); color: var(--white);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    box-shadow: 0 8px 24px rgba(13, 92, 69, 0.3);
    opacity: 0; visibility: hidden; transform: translateY(20px);
    transition: var(--transition); z-index: 999;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--primary-dark); }
.back-to-top svg { width: 20px; height: 20px; }

/* ============================
   动画
   ============================ */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.fade-in-up { animation: fadeInUp 0.8s ease forwards; opacity: 0; }
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* ============================
   响应式
   ============================ */
@media (max-width: 992px) {
    section { padding: 64px 0; }
    .hero { height: 480px; }
    .hero-title { font-size: 2.1rem; letter-spacing: 6px; }
    .about-content { grid-template-columns: 1fr; gap: 40px; }
    .contribution-content { grid-template-columns: 1fr; gap: 40px; }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .facilities-grid { grid-template-columns: 1fr; }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .partners-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 768px) {
    .menu-toggle { display: flex; }
    .nav {
        position: fixed; top: 0; right: -100%;
        width: 75%; max-width: 300px; height: 100vh;
        background: var(--white); box-shadow: -8px 0 32px rgba(0, 0, 0, 0.1);
        padding: 80px 24px 30px; transition: right 0.4s ease; z-index: 1000;
    }
    .nav.active { right: 0; }
    .nav-list { flex-direction: column; gap: 0; }
    .nav-list li { border-bottom: 1px solid var(--border); }
    .nav-link { display: block; padding: 16px 0; }
    .hero { height: 400px; }
    .hero-title { font-size: 1.6rem; letter-spacing: 4px; }
    .hero-slogan { font-size: 1.1rem; }
    .hero-sub { font-size: 0.8rem; }
    .section-title { font-size: 1.5rem; }
    .advantages-grid, .products-grid { grid-template-columns: 1fr; }
    .partners-grid { grid-template-columns: 1fr; }
    .btn { padding: 12px 32px; font-size: 0.88rem; }
    .back-to-top { bottom: 20px; right: 20px; width: 38px; height: 38px; }
}
@media (max-width: 480px) {
    .container { padding: 0 20px; }
    .hero-title { font-size: 1.3rem; letter-spacing: 3px; }
    .logo-text { font-size: 1rem; }
    .logo-img { height: 28px; max-height: 28px; }
}