/* ===== 通用 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: #1a1a1a;
    line-height: 1.8;
    background: #fff;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    font-size: 12px;
    letter-spacing: 4px;
    color: #888;
    margin-bottom: 12px;
    font-family: "Arial", sans-serif;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 20px;
}

.section-line {
    width: 50px;
    height: 3px;
    background: #1a1a1a;
    margin: 0 auto;
}

/* 按钮 */
.btn-primary {
    display: inline-block;
    padding: 12px 36px;
    background: #1a1a1a;
    color: #fff;
    font-size: 14px;
    letter-spacing: 2px;
    border: 2px solid #1a1a1a;
    transition: all 0.3s;
}

.btn-primary:hover {
    background: #333;
    border-color: #333;
}

.btn-ghost {
    display: inline-block;
    padding: 12px 36px;
    color: #1a1a1a;
    font-size: 14px;
    letter-spacing: 2px;
    border: 2px solid #1a1a1a;
    transition: all 0.3s;
}

.btn-ghost:hover {
    background: #1a1a1a;
    color: #fff;
}

.btn-outline {
    display: inline-block;
    padding: 12px 36px;
    color: #1a1a1a;
    font-size: 14px;
    letter-spacing: 2px;
    border: 2px solid #ccc;
    transition: all 0.3s;
}

.btn-outline:hover {
    border-color: #1a1a1a;
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    background: rgba(255,255,255,0.97);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    z-index: 999;
    backdrop-filter: blur(10px);
}

.header-inner {
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 18px;
    color: #1a1a1a;
}

.logo-text {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 3px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-link {
    font-size: 13px;
    color: #666;
    letter-spacing: 1px;
    transition: color 0.3s;
    position: relative;
}

.nav-link:hover {
    color: #1a1a1a;
}

.nav-btn {
    padding: 8px 20px;
    border: 1px solid #1a1a1a;
    font-size: 12px;
    letter-spacing: 2px;
    transition: all 0.3s;
}

.nav-btn:hover {
    background: #1a1a1a;
    color: #fff;
}

/* ===== 首屏 ===== */
.hero {
    height: 100vh;
    min-height: 700px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: #f5f5f5;
    z-index: 0;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: #ebebeb;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 0 40px;
}

.hero-badge {
    font-size: 11px;
    letter-spacing: 6px;
    color: #888;
    margin-bottom: 30px;
    font-family: "Arial", sans-serif;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: 6px;
    margin-bottom: 16px;
}

.hero-sub {
    font-size: 16px;
    color: #888;
    letter-spacing: 4px;
    margin-bottom: 50px;
}

.hero-divider {
    width: 60px;
    height: 2px;
    background: #1a1a1a;
    margin: 0 auto 40px;
}

.hero-desc {
    font-size: 14px;
    color: #666;
    line-height: 2.2;
    max-width: 640px;
    margin: 0 auto 50px;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    letter-spacing: 3px;
    color: #bbb;
    z-index: 1;
}

/* ===== 数据条 ===== */
.stats-bar {
    background: #1a1a1a;
    color: #fff;
    padding: 50px 0;
}

.stats-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 60px;
}

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

.stat-num {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: 2px;
    font-family: "Arial", sans-serif;
}

.stat-label {
    font-size: 13px;
    color: #999;
    letter-spacing: 2px;
    margin-top: 6px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: #444;
}

/* ===== 关于我们 ===== */
.about-section {
    background: #fff;
}

.about-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 80px;
    align-items: start;
}

.about-left {
    position: relative;
}

.about-img-box {
    width: 100%;
    height: 380px;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-img-inner {
    font-size: 14px;
    letter-spacing: 4px;
    color: #bbb;
}

.about-year {
    position: absolute;
    bottom: -30px;
    right: -30px;
    background: #1a1a1a;
    color: #fff;
    padding: 24px 30px;
    text-align: center;
}

.year-num {
    font-size: 40px;
    font-weight: 700;
    font-family: "Arial", sans-serif;
}

.year-label {
    font-size: 12px;
    letter-spacing: 2px;
    color: #999;
    margin-top: 4px;
}

.about-right {
    padding-top: 20px;
}

.about-text {
    margin-bottom: 40px;
}

.about-text h3 {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.about-text p {
    font-size: 14px;
    color: #666;
    line-height: 2;
}

/* ===== 产品中心 ===== */
.products-section {
    background: #f8f8f8;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.product-card {
    background: #fff;
    padding: 36px 24px;
    text-align: center;
    border: 1px solid #eee;
    transition: all 0.3s;
}

.product-card:hover {
    border-color: #1a1a1a;
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.06);
}

.product-highlight {
    background: #1a1a1a;
    color: #fff;
}

.product-highlight .product-material {
    color: #999;
}

.product-icon {
    font-size: 32px;
    margin-bottom: 16px;
    color: #1a1a1a;
}

.product-highlight .product-icon {
    color: #fff;
}

.product-name {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.product-desc {
    font-size: 12px;
    color: #999;
    line-height: 1.8;
    margin-bottom: 12px;
}

.product-material {
    font-size: 11px;
    color: #ccc;
    letter-spacing: 1px;
}

/* ===== 合作品牌 ===== */
.brands-section {
    background: #fff;
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 16px;
}

.brand-card {
    border: 1px solid #eee;
    padding: 30px 20px;
    text-align: center;
    transition: all 0.3s;
}

.brand-card:hover {
    border-color: #1a1a1a;
}

.brand-name {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 8px;
    font-family: "Arial", sans-serif;
}

.brand-country {
    font-size: 12px;
    color: #bbb;
    letter-spacing: 1px;
}

/* ===== 为什么选择我们 ===== */
.why-section {
    background: #f8f8f8;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.why-card {
    background: #fff;
    padding: 40px 30px;
    border: 1px solid #eee;
    transition: all 0.3s;
}

.why-card:hover {
    border-color: #1a1a1a;
}

.why-num {
    font-size: 48px;
    font-weight: 700;
    color: #f0f0f0;
    font-family: "Arial", sans-serif;
    margin-bottom: 20px;
}

.why-card h3 {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.why-card p {
    font-size: 13px;
    color: #888;
    line-height: 1.8;
}

/* ===== 联系方式 ===== */
.contact-section {
    background: #fff;
}

.contact-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 60px;
}

.contact-card {
    border: 1px solid #eee;
    padding: 30px 20px;
    text-align: center;
}

.contact-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.contact-label {
    font-size: 12px;
    color: #bbb;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.contact-value {
    font-size: 14px;
    font-weight: 500;
}

.contact-msg {
    text-align: center;
    border-top: 1px solid #eee;
    padding-top: 50px;
}

.contact-tip {
    font-size: 14px;
    color: #888;
    margin-bottom: 30px;
}

.contact-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* ===== 底部 ===== */
.footer {
    background: #1a1a1a;
    color: #fff;
    padding: 60px 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 3px;
}

.footer-desc {
    font-size: 12px;
    color: #666;
    margin-top: 8px;
    letter-spacing: 2px;
}

.footer-right p {
    font-size: 12px;
    color: #555;
    letter-spacing: 1px;
}