/* ============================================
   佰氏健康集团官网 - 主样式表
   ============================================ */

/* ---------- CSS变量 ---------- */
:root {
    --primary: #2E7D32;      /* 健康绿 */
    --primary-light: #4CAF50;
    --primary-dark: #1B5E20;
    --accent: #1565C0;       /* 科技蓝 */
    --accent-light: #42A5F5;
    --text: #1a1a1a;
    --text-second: #666;
    --bg: #ffffff;
    --bg-light: #f7f9f7;
    --bg-dark: #0d1b0f;
    --border: #e0e0e0;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
    --transition: all 0.3s ease;
    --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部信息栏 ---------- */
.top-bar {
    background: var(--bg-dark);
    color: #aaa;
    font-size: 13px;
    padding: 8px 0;
}
.top-bar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.top-contact span { margin-right: 24px; }
.top-links a {
    color: #aaa;
    margin-left: 20px;
    font-size: 13px;
}
.top-links a:hover { color: #fff; }

/* ---------- 主导航 ---------- */
.header {
    background: #fff;
    box-shadow: 0 2px 20px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}
.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    flex-shrink: 0;
}
.logo-text { display: flex; flex-direction: column; }
.logo-main { font-size: 18px; font-weight: 700; color: var(--text); letter-spacing: 2px; }
.logo-sub { font-size: 10px; color: var(--text-second); letter-spacing: 1px; }
.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-menu a {
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-second);
    position: relative;
}
.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
    background: rgba(46, 125, 50, 0.06);
}
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---------- 英雄区 ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0d1b0f 0%, #1B5E20 40%, #1565C0 100%);
    overflow: hidden;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 900"><rect fill="%230d1b0f" width="1440" height="900"/><circle fill="%231B5E20" opacity="0.3" cx="200" cy="200" r="300"/><circle fill="%231565C0" opacity="0.2" cx="1200" cy="600" r="400"/></svg>');
    background-size: cover;
    opacity: 0.6;
}
.hero-content {
    position: relative;
    z-index: 2;
    padding: 120px 0 80px;
    color: #fff;
}
.hero-sub {
    display: inline-block;
    background: rgba(255,255,255,0.15);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    letter-spacing: 2px;
    margin-bottom: 16px;
    backdrop-filter: blur(4px);
}
.hero-title {
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    max-width: 700px;
}
.hero-desc {
    font-size: 17px;
    line-height: 1.8;
    color: rgba(255,255,255,0.85);
    margin-bottom: 40px;
    max-width: 600px;
}
.hero-btns {
    display: flex;
    gap: 16px;
    margin-bottom: 80px;
    flex-wrap: wrap;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    letter-spacing: 0.5px;
}
.btn-primary {
    background: var(--primary-light);
    color: #fff;
    box-shadow: 0 4px 20px rgba(76, 175, 80, 0.4);
}
.btn-primary:hover {
    background: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(76, 175, 80, 0.5);
}
.btn-outline {
    border: 2px solid rgba(255,255,255,0.5);
    color: #fff;
    backdrop-filter: blur(4px);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
    transform: translateY(-2px);
}

/* 英雄区数据 */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 800px;
}
.stat-item {
    text-align: center;
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 24px 12px;
}
.stat-num {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    display: inline;
    background: linear-gradient(135deg, #81C784, #42A5F5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-unit {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    margin-left: 2px;
}
.stat-label {
    display: block;
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
}

/* ---------- 通用板块 ---------- */
.section {
    padding: 100px 0;
}
.section-header {
    text-align: center;
    margin-bottom: 64px;
}
.section-tag {
    display: inline-block;
    background: rgba(46, 125, 50, 0.08);
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 16px;
}
.section-title {
    font-size: clamp(28px, 3.5vw, 42px);
    font-weight: 700;
    margin-bottom: 16px;
}
.section-desc {
    font-size: 16px;
    color: var(--text-second);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}
.section-header.light .section-tag {
    background: rgba(255,255,255,0.15);
    color: #fff;
}
.section-header.light .section-title { color: #fff; }
.section-header.light .section-desc { color: rgba(255,255,255,0.7); }

/* ---------- 核心优势 ---------- */
.advantages { background: var(--bg-light); }
.adv-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.adv-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 40px 28px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid transparent;
}
.adv-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(46, 125, 50, 0.2);
}
.adv-icon {
    font-size: 40px;
    margin-bottom: 20px;
    display: block;
}
.adv-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}
.adv-card p {
    font-size: 14px;
    color: var(--text-second);
    line-height: 1.8;
}

/* ---------- 产品矩阵 ---------- */
.products-section { background: #fff; }
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.product-card {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    background: #fff;
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.product-img {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.product-emoji { font-size: 64px; }
.product-info { padding: 24px; }
.product-info h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}
.product-info p {
    font-size: 14px;
    color: var(--text-second);
}

/* ---------- 工厂实力 ---------- */
.factory-section {
    background: linear-gradient(135deg, #0d1b0f, #1B5E20);
    padding: 100px 0;
}
.factory-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 200px;
    gap: 16px;
}
.factory-img-card.large {
    grid-column: span 2;
    grid-row: span 2;
}
.factory-img-placeholder {
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: rgba(255,255,255,0.7);
    font-size: 18px;
    line-height: 1.8;
    transition: var(--transition);
}
.factory-img-placeholder:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.2);
}

/* ---------- 招商合作 ---------- */
.partnership-section {
    background: linear-gradient(135deg, #E8F5E9, #BBDEFB);
    padding: 100px 0;
}
.partnership-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}
.partnership-text .section-tag {
    background: rgba(46, 125, 50, 0.12);
    color: var(--primary-dark);
}
.partnership-text h2 {
    font-size: clamp(28px, 3.5vw, 42px);
    font-weight: 700;
    margin: 16px 0;
    line-height: 1.3;
    color: var(--text);
}
.partnership-text p {
    font-size: 16px;
    color: var(--text-second);
    margin-bottom: 32px;
    line-height: 1.8;
}
.partnership-text .btn-primary {
    background: var(--primary-dark);
}
.partnership-text .btn-primary:hover {
    background: var(--primary);
}
.benefit-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 28px;
}
.benefit-icon {
    font-size: 28px;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: rgba(46, 125, 50, 0.08);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.benefit-item h4 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 4px;
}
.benefit-item p {
    font-size: 14px;
    color: var(--text-second);
}

/* ---------- Footer ---------- */
.footer {
    background: var(--bg-dark);
    color: #aaa;
    padding: 64px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr 1.2fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}
.footer-logo .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 18px;
}
.footer-logo span {
    color: #fff;
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 1px;
}
.footer-col p {
    font-size: 14px;
    line-height: 1.8;
    color: #888;
}
.footer-col h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}
.footer-col ul li {
    margin-bottom: 12px;
    font-size: 14px;
    color: #888;
}
.footer-col ul li a:hover { color: #fff; }
.qr-placeholder {
    width: 120px;
    height: 120px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 12px;
    margin-top: 12px;
}
.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 13px;
    color: #666;
}
.footer-bottom a { color: #888; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 动画 ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .adv-grid { grid-template-columns: repeat(2, 1fr); }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .factory-grid { grid-template-columns: repeat(2, 1fr); }
    .factory-img-card.large { grid-column: span 2; grid-row: span 1; }
    .partnership-inner { grid-template-columns: 1fr; gap: 48px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border);
    }
    .nav-menu.open { display: flex; }
    .mobile-toggle { display: flex; }
    .hero-content { padding: 80px 0 60px; }
    .hero-title { font-size: 32px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .stat-item { padding: 16px 8px; }
    .adv-grid { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .factory-grid { grid-template-columns: 1fr; }
    .factory-img-card.large { grid-column: span 1; }
    .footer-grid { grid-template-columns: 1fr; }
    .section { padding: 70px 0; }
}

@media (max-width: 480px) {
    .hero-stats { grid-template-columns: 1fr 1fr; }
    .hero-btns { flex-direction: column; }
    .btn { width: 100%; }
    .container { padding: 0 16px; }
}