/* ========================================
   喜一良作 DWV 官网自定义样式 v2
   覆盖 zhangxue style.css 冲突，统一全站设计
   ======================================== */

:root {
    /* 主色调 - 源自官网 Logo 深海军蓝（DWV 品牌主调） */
    --primary-color: #0a1735;      /* Logo 主导深海军蓝 */
    --primary-mid: #1a2a55;        /* 中蓝过渡 */
    --primary-light: #2c3f74;      /* 浅一档 */
    --primary-dark: #05122d;       /* Logo 最深底色 */
    --primary-deep: #020817;       /* 极深，用于 hover */
    --primary-soft: #e8ecf5;       /* 淡蓝底 */
    --primary-pale: #f4f6fb;       /* 最浅蓝底 */
    /* 辅助色 - 源自 Logo 亮蓝钻石几何 */
    --accent-blue: #2069e2;        /* Logo 亮蓝（钻石装饰） */
    --accent-blue-bright: #4a8fef; /* 亮蓝高光 */
    --accent-blue-dark: #173fdd;   /* 深亮蓝 hover */
    --accent-blue-pale: #e6efff;   /* 极浅蓝底 */
    /* 主强调色 = 亮蓝（按钮/链接/CTA） */
    --accent-color: #2069e2;
    --accent-dark: #173fdd;
    /* 兼容变量 */
    --secondary-color: #2069e2;
    --secondary-dark: #173fdd;
    --info-color: #2069e2;
    /* 中性色 - 微冷调适配蓝色主题 */
    --text-dark: #0f1a2e;
    --text-body: #4a5468;
    --text-light: #8590a8;
    --bg-light: #F5F7FB;
    --bg-soft: #EBEFF7;
    --bg-white: #FFFFFF;
    --border-color: #dde2ec;
    --header-h: 80px;
}

* { box-sizing: border-box; }

body {
    font-family: 'Source Han Sans CN','PingFang SC','Microsoft YaHei','Manrope-Regular',Arial,sans-serif !important;
    color: var(--text-body);
    line-height: 1.75;
    background: #fff;
}

img { max-width: 100%; height: auto; }
a { color: var(--secondary-color); }
a:hover { color: var(--accent-color); }

h1, h2, h3, h4, h5, h6 {
    font-family: 'Source Han Sans CN','PingFang SC','Microsoft YaHei',sans-serif !important;
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.4;
}

/* ========================================
   1. HEADER 头部导航 - 高优先级覆盖 style.css
   ======================================== */
.header {
    width: 100%;
    background: #fff !important;
    backdrop-filter: none !important;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08) !important;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    transition: all .3s;
}
.header:hover { background: #fff !important; }
.header.on { background: #fff !important; box-shadow: 0 4px 16px rgba(0,0,0,0.1) !important; }

.header .container { max-width: 1400px; padding: 0 30px; }
.header .row { margin: 0; display: flex; justify-content: space-between; align-items: center; }

.header .logo { width: 180px; padding: 14px 0; }
.header .logo a { display: block; line-height: 0; }
.header .logo img {
    width: 100%; height: auto; display: block;
    opacity: 1 !important;
}
.header .logo img.d_w { display: none; }
.header:hover .logo img { opacity: 1 !important; }

.header .nav { display: flex; align-items: center; }
.header .nav ul { display: flex; margin: 0; padding: 0; list-style: none; }
.header .nav ul li { margin: 0 18px; position: relative; }
.header .nav .y_j a {
    display: inline-block;
    font-size: 15px !important;
    color: var(--text-dark) !important;
    line-height: var(--header-h) !important;
    font-weight: 500;
    position: relative;
    padding: 0;
    text-decoration: none;
}
.header:hover .nav .y_j a,
.header .nav .y_j a { color: var(--text-dark) !important; }
.header .nav ul li:hover .y_j a,
.header .nav ul li.on .y_j a { color: var(--secondary-color) !important; }
.header .nav .y_j a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 18px;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: all .3s;
    transform: translateX(-50%);
}
.header .nav ul li:hover .y_j a::after,
.header .nav ul li.on .y_j a::after { width: 24px; }

.header .yc_nr { display: flex; align-items: center; }
.header .an {
    width: 28px; height: 22px;
    display: none;
    position: relative;
    cursor: pointer;
}
.header .an span {
    width: 28px; height: 2px;
    background: var(--text-dark) !important;
    display: block; position: absolute;
    transition: all .3s;
}
.header:hover .an span { background: var(--text-dark) !important; }
.header .an .a1 { top: 0; left: 0; }
.header .an .a2 { top: 10px; left: 0; }
.header .an .a3 { top: 20px; left: 0; }
.header .an.n .a2 { display: none; }
.header .an.n .a1 { top: 10px; transform: rotate(45deg); }
.header .an.n .a3 { top: 10px; transform: rotate(-45deg); }

.head_h { height: var(--header-h); }

/* 桌面端（>1260px）强制覆盖 style.css 的遗留规则，确保 nav 正常显示 */
@media (min-width: 1261px) {
    .header .nav {
        position: static !important;
        right: auto !important;
        width: auto !important;
        height: auto !important;
        background: transparent !important;
        padding: 0 !important;
        box-shadow: none !important;
        overflow: visible !important;
        display: flex !important;
    }
    .header .an { display: none !important; }
}

/* 汉堡菜单触发点：≤1260px 切换为移动端布局（与 style.css 隐藏断点对齐） */
@media (max-width: 1260px) {
    :root { --header-h: 70px; }
    .header .logo { width: 170px; padding: 11px 0; }
    .header .an { display: block; }
    .header .nav {
        position: fixed;
        top: var(--header-h);
        right: -100%;
        width: 300px;
        max-width: 85vw;
        height: calc(100vh - var(--header-h));
        background: #fff;
        padding: 20px;
        box-shadow: -4px 0 16px rgba(0,0,0,0.1);
        transition: right .3s ease;
        display: block !important;
        overflow-y: auto;
        z-index: 9998;
    }
    .header .nav.on { right: 0; }
    .header .nav ul {
        flex-direction: column;
        display: block;
    }
    .header .nav ul li {
        margin: 0;
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }
    .header .nav .y_j a {
        line-height: 50px !important;
        display: block;
        padding: 0 4px;
    }
    .header .nav .y_j a::after { display: none; }
    /* 半透明遮罩层 */
    body.nav-open::after {
        content: "";
        position: fixed;
        inset: 0;
        background: rgba(10,23,53,0.4);
        z-index: 9997;
        animation: fadeIn .3s;
    }
    @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
}
@media (max-width: 768px) {
    :root { --header-h: 64px; }
    .header .logo { width: 155px; padding: 9px 0; }
}

/* ========================================
   2. HERO SWIPER 首页轮播
   ======================================== */
.hero-swiper {
    width: 100%;
    height: calc(100vh - var(--header-h));
    min-height: 560px;
    max-height: 760px;
    position: relative;
    overflow: hidden;
}
.hero-swiper .swiper-slide {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    overflow: hidden;
}
.hero-slide-bg {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    z-index: 0;
}
.hero-slide-bg::after {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(10,23,53,0.85) 0%, rgba(10,23,53,0.65) 100%);
}
/* Slide 1: 深墨青主视觉 + 柔光晕 */
.hero-slide-1 .hero-slide-bg { background: radial-gradient(ellipse at 25% 50%, #2c3f74 0%, #05122d 55%, #020817 100%); }
.hero-slide-1 .hero-slide-bg::before {
    content: ""; position: absolute; inset: 0;
    background:
        radial-gradient(circle at 75% 25%, rgba(74,143,239,0.45) 0%, transparent 50%),
        radial-gradient(circle at 90% 90%, rgba(32,105,226,0.25) 0%, transparent 45%);
}
/* Slide 2: 产品技术 - 墨青+DWV亮蓝 */
.hero-slide-2 .hero-slide-bg { background: linear-gradient(135deg, #020817 0%, #05122d 45%, #173fdd 100%); }
.hero-slide-2 .hero-slide-bg::before {
    content: ""; position: absolute; inset: 0;
    background:
        linear-gradient(45deg, transparent 55%, rgba(32,105,226,0.35) 100%),
        radial-gradient(circle at 20% 80%, rgba(74,143,239,0.3) 0%, transparent 40%);
}
/* Slide 3: 合作邀请 - 墨青主 + 暖金点缀 */
.hero-slide-3 .hero-slide-bg { background: linear-gradient(120deg, #05122d 0%, #0a1735 40%, #4a8fef 110%); }
.hero-slide-3 .hero-slide-bg::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(circle at 85% 30%, rgba(74,143,239,0.45) 0%, transparent 50%);
}
.hero-slide-1 .hero-slide-bg::after,
.hero-slide-2 .hero-slide-bg::after,
.hero-slide-3 .hero-slide-bg::after { background: rgba(0,0,0,0.15); }

.hero-slide-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    width: 100%;
    padding: 0 30px;
    text-align: center;
}
.hero-slide-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 30px;
    font-size: 13px;
    letter-spacing: 2px;
    color: #fff;
    margin-bottom: 24px;
}
.hero-slide-title {
    font-size: 52px;
    font-weight: 700;
    color: #fff !important;
    margin: 0 0 20px;
    line-height: 1.2;
    text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}
.hero-slide-subtitle {
    font-size: 24px;
    font-weight: 400;
    color: rgba(255,255,255,0.95) !important;
    margin: 0 0 20px;
}
.hero-slide-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.85);
    max-width: 720px;
    margin: 0 auto 40px;
    line-height: 1.8;
}
.hero-slide-buttons { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.hero-slide-buttons .btn { padding: 14px 36px; font-size: 15px; border-radius: 30px; font-weight: 500; }

/* Swiper 控件 */
.hero-swiper .swiper-pagination { bottom: 30px !important; }
.hero-swiper .swiper-pagination-bullet {
    width: 36px; height: 4px;
    border-radius: 2px;
    background: rgba(255,255,255,0.4);
    opacity: 1;
    transition: all .3s;
}
.hero-swiper .swiper-pagination-bullet-active {
    background: #fff;
    width: 56px;
}
.hero-swiper .swiper-button-prev,
.hero-swiper .swiper-button-next {
    width: 56px; height: 56px;
    margin-top: -28px;
    background: rgba(255,255,255,0.18);
    border: 2px solid rgba(255,255,255,0.6);
    border-radius: 50%;
    color: #fff !important;
    transition: all .3s;
    opacity: 1 !important;
    visibility: visible !important;
    display: flex !important;
    align-items: center;
    justify-content: center;
    z-index: 10;
    cursor: pointer;
    backdrop-filter: blur(6px);
}
.hero-swiper .swiper-button-prev { left: 30px; }
.hero-swiper .swiper-button-next { right: 30px; }
.hero-swiper .swiper-button-prev:hover,
.hero-swiper .swiper-button-next:hover {
    background: #fff;
    border-color: #fff;
    color: var(--primary-color) !important;
    transform: scale(1.08);
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}
.hero-swiper .swiper-button-prev::after,
.hero-swiper .swiper-button-next::after {
    font-family: 'swiper-icons','Arial',sans-serif !important;
    font-size: 22px !important;
    font-weight: 900 !important;
    color: inherit;
    line-height: 1;
    letter-spacing: 0;
}
/* 强制使用清晰的箭头符号，覆盖swiper默认文字 */
.hero-swiper .swiper-button-prev::after { content: "\2039" !important; font-size: 38px !important; }
.hero-swiper .swiper-button-next::after { content: "\203A" !important; font-size: 38px !important; }
.hero-swiper .swiper-button-disabled {
    opacity: 0.5 !important;
    pointer-events: auto !important;
}

@media (max-width: 768px) {
    .hero-swiper { height: 80vh; min-height: 480px; }
    .hero-slide-title { font-size: 32px; }
    .hero-slide-subtitle { font-size: 18px; }
    .hero-slide-desc { font-size: 14px; }
    .hero-swiper .swiper-button-prev,
    .hero-swiper .swiper-button-next {
        width: 42px; height: 42px;
        margin-top: -21px;
    }
    .hero-swiper .swiper-button-prev { left: 12px; }
    .hero-swiper .swiper-button-next { right: 12px; }
    .hero-swiper .swiper-button-prev::after,
    .hero-swiper .swiper-button-next::after { font-size: 15px !important; }
}
@media (max-width: 480px) {
    .hero-swiper .swiper-button-prev,
    .hero-swiper .swiper-button-next { display: none !important; }
}

/* ========================================
   3. 按钮统一样式
   ======================================== */
.btn {
    display: inline-block;
    padding: 12px 32px;
    font-size: 15px;
    font-weight: 500;
    border-radius: 30px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all .3s;
    line-height: 1.5;
}
.btn-primary {
    background: var(--accent-color) !important;
    color: #fff !important;
    border: 2px solid var(--accent-color) !important;
}
.btn-primary:hover {
    background: #173fdd !important;
    border-color: #173fdd !important;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(10,23,53,0.35);
    color: #fff !important;
}
.btn-secondary {
    background: transparent !important;
    color: #fff !important;
    border: 2px solid rgba(255,255,255,0.85) !important;
}
.btn-secondary:hover {
    background: #fff !important;
    color: var(--primary-color) !important;
    transform: translateY(-2px);
}
.btn-outline {
    background: transparent !important;
    color: var(--primary-color) !important;
    border: 2px solid var(--primary-color) !important;
}
.btn-outline:hover {
    background: var(--primary-color) !important;
    color: #fff !important;
}

/* ========================================
   4. 内页页头 (page-header) 统一样式
   ======================================== */
.page-header {
    position: relative;
    background: linear-gradient(135deg, #020817 0%, #05122d 40%, #0a1735 100%);
    padding: 110px 0 80px;
    text-align: center;
    color: #fff;
    overflow: hidden;
}
.page-header::after {
    content: "";
    position: absolute;
    right: -120px; top: -80px;
    width: 360px; height: 360px;
    background: radial-gradient(circle, rgba(10,23,53,0.35) 0%, transparent 60%);
    pointer-events: none;
}
.page-header::before {
    content: "";
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'><circle cx='30' cy='30' r='1' fill='rgba(255,255,255,0.08)'/></svg>");
    opacity: 0.5;
}
.page-header .container { position: relative; z-index: 2; }
.page-header .page-title {
    font-size: 44px;
    color: #fff !important;
    margin: 0 0 12px;
    font-weight: 700;
}
.page-header .page-subtitle {
    font-size: 17px;
    color: rgba(255,255,255,0.8);
    font-weight: 400;
    margin: 0;
    letter-spacing: 1px;
}
@media (max-width: 768px) {
    .page-header { padding: 80px 0 50px; }
    .page-header .page-title { font-size: 30px; }
    .page-header .page-subtitle { font-size: 14px; }
}

/* ========================================
   5. SECTION 通用版式
   ======================================== */
section { padding: 80px 0; }
section:nth-of-type(even) { background: var(--bg-light); }

.section-header { text-align: center; margin-bottom: 50px; }
.section-label {
    display: inline-block;
    color: var(--secondary-color);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 12px;
    text-transform: uppercase;
}
.section-title {
    font-size: 36px;
    color: var(--text-dark) !important;
    margin: 0 0 16px;
    font-weight: 700;
    position: relative;
    display: inline-block;
}
.section-title::after {
    content: "";
    display: block;
    width: 50px;
    height: 3px;
    background: var(--secondary-color);
    margin: 16px auto 0;
}

.content-box {
    background: #fff;
    padding: 50px;
    border-radius: 12px;
    box-shadow: 0 6px 24px rgba(10,23,53,0.06);
}
.content-box .section-title { display: block; }
.content-box .section-title::after { margin-left: 0; }
.section-header .section-title::after { margin: 16px auto 0; }

.content-title {
    font-size: 26px;
    color: var(--primary-color) !important;
    margin: 0 0 22px;
    font-weight: 700;
}
.content-text {
    font-size: 16px;
    color: var(--text-body);
    line-height: 1.85;
    margin-bottom: 18px;
}
.intro-text {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 30px;
    text-align: center;
}
.highlight-text {
    font-size: 19px;
    font-weight: 700;
    color: var(--primary-color);
    background: var(--bg-light);
    border-left: 4px solid var(--secondary-color);
    padding: 18px 22px;
    margin: 28px 0;
    border-radius: 0 8px 8px 0;
}
.warning-text {
    color: var(--accent-color);
    font-weight: 700;
    font-size: 17px;
    margin-top: 24px;
    text-align: center;
}
.note-text {
    text-align: center;
    margin-top: 24px;
    color: var(--text-light);
    font-size: 15px;
}

/* 通用列表 */
.problem-list h4,
.feature-box h4,
.cooperation-box h4,
.benefit-box h4,
.standard-details h4 {
    font-size: 18px;
    color: var(--primary-color) !important;
    margin: 0 0 14px;
    font-weight: 700;
}
.problem-list ul,
.feature-box ul,
.cooperation-box ul,
.benefit-box ul,
.standard-details ul,
.product-features ul,
.product-applications ul,
.service-area-item ul,
.variant-item ul,
.model-details ul,
.model-requirements ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.problem-list ul li,
.feature-box ul li,
.cooperation-box ul li,
.benefit-box ul li,
.standard-details ul li,
.service-area-item ul li,
.variant-item ul li,
.model-details ul li,
.model-requirements ul li {
    padding: 8px 0 8px 26px;
    position: relative;
    font-size: 15px;
    color: var(--text-body);
    line-height: 1.7;
}
.problem-list ul li::before,
.feature-box ul li::before,
.cooperation-box ul li::before,
.benefit-box ul li::before,
.standard-details ul li::before,
.service-area-item ul li::before,
.variant-item ul li::before,
.model-details ul li::before,
.model-requirements ul li::before {
    content: "";
    position: absolute;
    left: 6px; top: 16px;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--secondary-color);
}
.product-features ul li,
.product-applications ul li {
    padding: 8px 0 8px 28px;
    position: relative;
    font-size: 15px;
    color: var(--text-body);
}
.product-features ul li::before,
.product-applications ul li::before {
    content: "✓";
    position: absolute;
    left: 0; top: 8px;
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 16px;
}

/* feature-grid */
.feature-grid { margin-top: 30px; }
.feature-box {
    background: var(--bg-light);
    padding: 28px;
    border-radius: 10px;
    margin-bottom: 20px;
    height: 100%;
}

/* ========================================
   6. 优势卡片网格
   ======================================== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-top: 36px;
}
.advantage-item {
    background: #fff;
    padding: 36px 28px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all .3s;
}
.advantage-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(10,23,53,0.15);
    border-color: transparent;
}
.advantage-number {
    font-size: 42px;
    font-weight: 700;
    color: var(--secondary-color);
    opacity: 0.25;
    margin-bottom: 10px;
    line-height: 1;
}
.advantage-item h4 {
    font-size: 19px;
    color: var(--primary-color) !important;
    margin: 0 0 12px;
    font-weight: 700;
}
.advantage-item p {
    color: var(--text-body);
    font-size: 14px;
    line-height: 1.7;
    margin: 0;
}

/* 应用场景 */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
    margin: 36px 0;
}
.application-item {
    background: linear-gradient(135deg, var(--primary-mid), var(--primary-dark));
    color: #fff;
    padding: 26px 18px;
    text-align: center;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    transition: all .3s;
}
.application-item:hover { transform: scale(1.04); box-shadow: 0 10px 24px rgba(10,23,53,0.3); }

/* 品牌信息 */
.brand-info {
    padding: 32px;
    background: var(--bg-light);
    border-radius: 10px;
    margin-top: 24px;
}
.brand-info p { margin: 0 0 14px; font-size: 15px; line-height: 1.8; }
.brand-english { font-style: italic; color: var(--secondary-color); font-size: 17px; }

/* 合作 */
.cooperation-content { margin-top: 30px; }
.cooperation-box {
    background: var(--bg-light);
    padding: 28px;
    border-radius: 10px;
    height: 100%;
    margin-bottom: 20px;
}
.cooperation-note { text-align: center; font-size: 16px; margin: 30px 0; color: var(--text-body); }
.cooperation-cta { text-align: center; margin-top: 30px; }

/* ========================================
   7. 系统原理页面 - DWV / 流程
   ======================================== */
.dwv-definition {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 40px 0;
}
.dwv-item {
    text-align: center;
    padding: 36px 20px;
    background: var(--bg-light);
    border-radius: 12px;
    transition: all .3s;
}
.dwv-item:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-blue) 100%);
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(10,23,53,0.25);
}
.dwv-item:hover .dwv-letter,
.dwv-item:hover .dwv-name,
.dwv-item:hover .dwv-desc { color: #fff !important; }
.dwv-letter {
    font-size: 64px;
    font-weight: 700;
    color: var(--secondary-color);
    line-height: 1;
    margin-bottom: 10px;
    transition: color .3s;
}
.dwv-name { font-size: 20px; color: var(--primary-color); margin-bottom: 4px; font-weight: 700; transition: color .3s; }
.dwv-desc { font-size: 15px; color: var(--text-light); transition: color .3s; }

.process-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 36px 0;
    flex-wrap: wrap;
    gap: 12px;
}
.process-item { flex: 1; min-width: 130px; text-align: center; }
.process-icon {
    width: 56px; height: 56px;
    background: var(--secondary-color);
    color: #fff;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; font-weight: 700;
    margin: 0 auto 12px;
    box-shadow: 0 6px 16px rgba(10,23,53,0.3);
}
.process-item p { font-size: 14px; color: var(--text-body); margin: 0; }
.process-arrow { font-size: 22px; color: var(--secondary-color); flex: 0 0 auto; }

.mistakes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin: 36px 0;
}
.mistake-item {
    text-align: center;
    padding: 28px 20px;
    background: #fff5f0;
    border: 1px solid #ffe0d0;
    border-radius: 10px;
}
.mistake-icon {
    width: 50px; height: 50px;
    border-radius: 50%;
    background: #fff;
    color: var(--accent-color);
    font-size: 24px;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 14px;
    border: 2px solid var(--accent-color);
}
.mistake-item h4 { font-size: 16px; color: var(--text-dark) !important; margin: 0; font-weight: 600; }

.optimization-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 22px;
    margin: 36px 0;
}
.optimization-item {
    background: #fff;
    padding: 28px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all .3s;
}
.optimization-item:hover { border-color: var(--secondary-color); box-shadow: 0 8px 24px rgba(10,23,53,0.1); }
.optimization-number {
    font-size: 32px; font-weight: 700;
    color: var(--secondary-color);
    opacity: 0.3;
    line-height: 1;
}
.optimization-item h4 { font-size: 17px; color: var(--primary-color) !important; margin: 10px 0; }
.optimization-item p { font-size: 13px; color: var(--text-light); margin: 0; }

/* ========================================
   8. 产品页面
   ======================================== */
.product-item {
    margin-bottom: 50px;
    padding: 40px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 6px 24px rgba(10,23,53,0.06);
}
.product-item:last-child { margin-bottom: 0; }
.product-image { padding: 20px; text-align: center; }
.product-image img { max-width: 100%; border-radius: 8px; }
.product-model-tag {
    display: inline-block;
    padding: 4px 14px;
    background: var(--primary-soft);
    color: var(--primary-color);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    border-radius: 30px;
    margin-bottom: 12px;
    text-transform: uppercase;
}
.product-title {
    font-size: 28px;
    color: var(--primary-color) !important;
    margin: 0 0 8px;
    font-weight: 700;
    position: relative;
    padding-bottom: 14px;
}
.product-title::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 40px; height: 3px;
    background: var(--primary-color);
}
.product-subtitle {
    font-size: 14px;
    color: var(--text-light);
    margin: 0 0 22px;
    letter-spacing: 1px;
    font-style: italic;
}
.spec-item {
    display: flex;
    align-items: baseline;
    padding: 6px 0;
    border-bottom: 1px dashed rgba(10,23,53,0.15);
}
.spec-item:last-child { border-bottom: none; }
.spec-label {
    flex: 0 0 110px;
    color: var(--primary-dark) !important;
}
.spec-value { color: var(--text-dark); font-weight: 500; }

/* 通气阀工作状态卡片 */
.valve-states {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin: 30px 0;
}
.valve-state-card {
    position: relative;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 36px 28px 28px;
    transition: all .3s;
}
.valve-state-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 12px 30px rgba(10,23,53,0.12);
    transform: translateY(-3px);
}
.valve-state-card:nth-child(1) { border-top: 4px solid var(--accent-blue); }
.valve-state-card:nth-child(2) { border-top: 4px solid var(--primary-dark); }
.valve-state-num {
    position: absolute;
    top: -18px; left: 24px;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: var(--primary-color);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; font-weight: 700;
    box-shadow: 0 4px 12px rgba(10,23,53,0.3);
}
.valve-state-card:nth-child(1) .valve-state-num { background: var(--accent-blue); box-shadow: 0 4px 12px rgba(32,105,226,0.3); }
.valve-state-card h3 {
    color: var(--primary-color) !important;
    font-size: 20px;
    margin: 0 0 14px;
    font-weight: 700;
}
.valve-state-card p {
    color: var(--text-body);
    line-height: 1.85;
    margin: 0 0 18px;
    font-size: 14.5px;
}
.valve-state-features {
    list-style: none;
    padding: 18px 0 0;
    margin: 0;
    border-top: 1px dashed var(--border-color);
}
.valve-state-features li {
    padding: 6px 0 6px 22px;
    position: relative;
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.7;
}
.valve-state-features li::before {
    content: "▸";
    position: absolute;
    left: 4px; top: 6px;
    color: var(--primary-color);
    font-weight: 700;
}
.valve-state-features li strong { color: var(--primary-dark); }

.valve-diagram-wrap {
    margin: 30px 0;
    background: var(--primary-pale);
    padding: 22px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
}
.valve-diagram-wrap img { max-width: 100%; height: auto; }

@media (max-width: 768px) {
    .valve-states { grid-template-columns: 1fr; }
}

/* 全屋系统剖析图展示 */
.section-house-diagram {
    background: linear-gradient(180deg, var(--primary-pale) 0%, #fff 100%);
    padding: 80px 0;
}
.house-diagram-wrap {
    background: #fff;
    border-radius: 14px;
    padding: 28px;
    box-shadow: 0 8px 30px rgba(10,23,53,0.1);
    border: 1px solid var(--border-color);
}
.house-diagram-wrap img { width: 100%; border-radius: 8px; }
.diagram-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
    margin-top: 24px;
    padding: 18px;
    background: var(--primary-pale);
    border-radius: 8px;
}
.diagram-legend .legend-item {
    display: flex; align-items: center;
    font-size: 14px;
    color: var(--text-dark);
}
.diagram-legend .legend-color {
    width: 24px; height: 12px;
    margin-right: 8px;
    border-radius: 2px;
    border: 1px solid rgba(0,0,0,0.1);
}
.product-specs {
    background: var(--bg-light);
    padding: 22px 24px;
    border-radius: 8px;
    margin-bottom: 22px;
    font-size: 14.5px;
}
.product-specs .spec-label { font-weight: 600; }
.product-description p { margin: 0 0 12px; line-height: 1.8; }
.product-features, .product-applications { margin-top: 22px; }
.product-features h4, .product-applications h4 { font-size: 17px; color: var(--primary-color) !important; margin: 0 0 12px; }
.product-variants { margin-top: 0; }
.variant-item {
    background: var(--bg-light);
    padding: 24px;
    border-radius: 10px;
    margin-bottom: 18px;
}
.variant-item h4 { font-size: 18px; color: var(--primary-color) !important; margin: 0 0 12px; }
.variant-item p { font-size: 14px; margin-bottom: 12px; }

/* 对比表 */
.comparison-table { overflow-x: auto; margin-top: 36px; }
.comparison-table table {
    width: 100%;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    border-collapse: collapse;
    box-shadow: 0 4px 16px rgba(10,23,53,0.06);
}
.comparison-table th {
    background: var(--primary-color);
    color: #fff;
    padding: 16px;
    font-weight: 600;
    text-align: left;
}
.comparison-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-body);
}
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr:nth-child(even) td { background: var(--bg-light); }

/* ========================================
   9. 工程标准页面
   ======================================== */
.standards-list { margin-top: 36px; }
.standard-item {
    display: flex;
    margin-bottom: 28px;
    padding: 32px;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all .3s;
}
.standard-item:hover { box-shadow: 0 10px 28px rgba(10,23,53,0.12); border-color: transparent; }
.standard-number {
    font-size: 48px; font-weight: 700;
    color: var(--secondary-color);
    opacity: 0.3;
    line-height: 1;
    min-width: 80px;
    margin-right: 24px;
}
.standard-content h3 { font-size: 22px; color: var(--primary-color) !important; margin: 0 0 14px; }
.standard-content p { color: var(--text-body); line-height: 1.8; margin: 0 0 18px; }
.standard-details {
    background: var(--bg-light);
    padding: 18px 22px;
    border-radius: 8px;
}

/* 流程时间线 */
.process-timeline { position: relative; padding-left: 40px; margin: 36px 0; }
.process-timeline::before {
    content: "";
    position: absolute;
    left: 19px; top: 8px; bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-color), var(--primary-dark));
}
.timeline-item { position: relative; margin-bottom: 28px; padding-left: 36px; }
.timeline-marker {
    position: absolute;
    left: -22px; top: 0;
    width: 40px; height: 40px;
    background: var(--secondary-color);
    color: #fff;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(10,23,53,0.3);
    z-index: 2;
}
.timeline-content h4 { font-size: 18px; color: var(--primary-color) !important; margin: 6px 0 8px; }
.timeline-content p { color: var(--text-body); margin: 0; }

/* 技术支持 */
.support-grid { margin-top: 36px; }
.support-item {
    text-align: center;
    padding: 32px 24px;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    transition: all .3s;
    height: calc(100% - 24px);
}
.support-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 24px rgba(10,23,53,0.12);
    border-color: transparent;
}
.support-icon { font-size: 42px; margin-bottom: 16px; }
.support-item h4 { font-size: 17px; color: var(--primary-color) !important; margin: 0 0 10px; }
.support-item p { color: var(--text-light); font-size: 14px; margin: 0; }

/* ========================================
   10. 招商页面
   ======================================== */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 36px;
}
.model-item {
    background: #fff;
    padding: 36px 28px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all .3s;
    margin-bottom: 0;
}
.model-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 28px rgba(10,23,53,0.15);
    border-color: transparent;
}
.model-icon { font-size: 48px; text-align: center; margin-bottom: 16px; }
.model-item h3 {
    font-size: 24px;
    text-align: center;
    color: var(--primary-color) !important;
    margin: 0 0 14px;
    font-weight: 700;
}
.model-description {
    text-align: center;
    font-size: 15px;
    color: var(--secondary-color);
    margin: 0 0 22px;
    font-weight: 600;
    padding-bottom: 22px;
    border-bottom: 1px dashed var(--border-color);
}
.model-details, .model-requirements { margin-top: 18px; }
.model-details h4, .model-requirements h4 { font-size: 16px; color: var(--primary-color) !important; margin: 0 0 10px; }

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 22px;
    margin: 36px 0;
}
.requirement-item {
    text-align: center;
    padding: 32px 24px;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}
.requirement-icon { font-size: 42px; margin-bottom: 16px; }
.requirement-item h4 { font-size: 18px; color: var(--primary-color) !important; margin: 0 0 12px; }
.requirement-item p { color: var(--text-body); font-size: 14px; line-height: 1.7; margin: 0; }

.benefits-grid { margin-top: 36px; }
.benefit-box {
    background: var(--bg-light);
    padding: 28px;
    border-radius: 10px;
    margin-bottom: 22px;
    height: calc(100% - 22px);
}

/* 表单 */
.cooperation-form, .contact-form {
    max-width: 820px;
    margin: 30px auto 0;
}
.form-intro { text-align: center; margin-bottom: 30px; color: var(--text-light); }
.form-group { margin-bottom: 22px; }
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
    font-size: 14px;
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color) !important;
    border-radius: 8px;
    font-size: 14px;
    background: #fff;
    transition: border-color .3s;
    font-family: inherit;
}
.form-control:focus {
    outline: none;
    border-color: var(--secondary-color) !important;
    box-shadow: 0 0 0 3px rgba(10,23,53,0.1);
}
textarea.form-control { resize: vertical; min-height: 120px; }
.form-submit { text-align: center; margin-top: 30px; }

/* ========================================
   11. 关于页面
   ======================================== */
.company-slogan {
    font-size: 18px;
    font-style: italic;
    color: var(--secondary-color);
    text-align: center;
    margin-bottom: 36px;
}
.company-name {
    font-size: 22px;
    color: var(--primary-color);
    margin: 16px 0;
    font-weight: 700;
}
.company-description p { margin-bottom: 16px; line-height: 1.85; color: var(--text-body); }
.company-image img { border-radius: 12px; box-shadow: 0 8px 24px rgba(10,23,53,0.12); }

.philosophy-content { margin-top: 36px; }
.philosophy-item {
    margin-bottom: 24px;
    padding: 28px;
    background: var(--bg-light);
    border-radius: 10px;
    border-left: 4px solid var(--secondary-color);
}
.philosophy-item h3 { font-size: 22px; color: var(--primary-color) !important; margin: 0 0 14px; }
.philosophy-item p { margin: 0 0 12px; line-height: 1.8; }
.vision-text { font-size: 20px; font-weight: 700; color: var(--secondary-color); margin: 14px 0; }

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 22px;
    margin-top: 36px;
}
.value-item {
    text-align: center;
    padding: 32px 22px;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all .3s;
}
.value-item:hover { transform: translateY(-4px); box-shadow: 0 10px 24px rgba(10,23,53,0.12); border-color: transparent; }
.value-icon { font-size: 42px; margin-bottom: 14px; }
.value-item h4 { font-size: 18px; color: var(--primary-color) !important; margin: 0 0 12px; }
.value-item p { color: var(--text-body); font-size: 14px; line-height: 1.7; margin: 0; }

.choose-reasons { margin-top: 36px; }
.reason-item {
    display: flex;
    margin-bottom: 22px;
    padding: 28px;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all .3s;
}
.reason-item:hover { box-shadow: 0 10px 24px rgba(10,23,53,0.12); border-color: transparent; }
.reason-number {
    font-size: 42px; font-weight: 700;
    color: var(--secondary-color);
    opacity: 0.3;
    line-height: 1;
    min-width: 70px;
    margin-right: 22px;
}
.reason-content h4 { font-size: 18px; color: var(--primary-color) !important; margin: 4px 0 10px; }
.reason-content p { color: var(--text-body); line-height: 1.7; margin: 0; }

.commitment-box {
    text-align: center;
    padding: 50px 40px;
    background: linear-gradient(135deg, #020817 0%, #0a1735 60%, #173fdd 100%);
    color: #fff;
    border-radius: 14px;
    position: relative;
    overflow: hidden;
}
.commitment-box::after {
    content: "";
    position: absolute;
    right: -80px; top: -60px;
    width: 280px; height: 280px;
    background: radial-gradient(circle, rgba(74,143,239,0.25) 0%, transparent 60%);
    pointer-events: none;
}
.commitment-box > * { position: relative; z-index: 1; }
.commitment-box h3 { font-size: 30px; color: #fff !important; margin: 0 0 22px; }
.commitment-content p { font-size: 16px; margin-bottom: 14px; line-height: 1.8; color: rgba(255,255,255,0.95); }
.commitment-content .highlight-text {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border-left-color: rgba(255,255,255,0.5);
    font-size: 18px;
    text-align: center;
}

/* ========================================
   12. 联系页面
   ======================================== */
.contact-intro { margin-bottom: 32px; }
.contact-intro h2 { font-size: 28px; color: var(--primary-color) !important; margin: 0 0 12px; }
.contact-description { font-size: 15px; color: var(--text-light); margin-top: 14px; }
.contact-methods { margin-top: 28px; }
.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 18px;
    padding: 22px;
    background: var(--bg-light);
    border-radius: 10px;
    transition: all .3s;
}
.contact-item:hover { background: #fff; box-shadow: 0 6px 18px rgba(10,23,53,0.1); }
.contact-icon { font-size: 30px; margin-right: 18px; min-width: 44px; }
.contact-details h4 { font-size: 16px; color: var(--primary-color) !important; margin: 0 0 6px; }
.contact-details p { margin: 0 0 4px; color: var(--text-dark); font-size: 14px; }
.contact-note { font-size: 12px !important; color: var(--text-light) !important; }

.qr-codes {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    flex-wrap: wrap;
    gap: 24px;
    padding: 20px 0;
}
.qr-code-item { text-align: center; }
.qr-code-item img {
    width: 180px; height: 180px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 8px;
    background: #fff;
    margin-bottom: 10px;
}
.qr-code-item p { font-size: 14px; color: var(--text-dark); margin: 0; }

.service-areas-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 22px;
    margin-top: 30px;
}
.service-area-item {
    background: #fff;
    padding: 26px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all .3s;
}
.service-area-item:hover { border-color: var(--secondary-color); box-shadow: 0 8px 20px rgba(10,23,53,0.1); }
.service-area-item h4 { font-size: 17px; color: var(--primary-color) !important; margin: 0 0 14px; }

.faq-list { margin-top: 30px; }
.faq-item {
    background: #fff;
    padding: 22px 26px;
    border-radius: 10px;
    margin-bottom: 14px;
    border: 1px solid var(--border-color);
    transition: all .3s;
}
.faq-item:hover { border-color: var(--secondary-color); }
.faq-item h4 {
    font-size: 16px;
    color: var(--primary-color) !important;
    margin: 0 0 10px;
    cursor: pointer;
    line-height: 1.6;
}
.faq-item p { color: var(--text-body); line-height: 1.8; margin: 0; font-size: 14px; }

.map-container {
    margin-top: 30px;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

/* ========================================
   13. CTA 区块
   ======================================== */
.section-cta {
    position: relative;
    background: linear-gradient(135deg, #020817 0%, #0a1735 60%, #173fdd 100%) !important;
    padding: 70px 0;
    overflow: hidden;
}
.section-cta::after {
    content: "";
    position: absolute;
    right: -100px; top: -60px;
    width: 320px; height: 320px;
    background: radial-gradient(circle, rgba(74,143,239,0.3) 0%, transparent 60%);
    pointer-events: none;
}
.section-cta::before { display: none; }
.cta-box { text-align: center; color: #fff; }
.cta-box h3 { font-size: 30px; color: #fff !important; margin: 0 0 14px; }
.cta-box p { font-size: 16px; color: rgba(255,255,255,0.9); margin: 0 0 28px; }
.cta-buttons { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ========================================
   14. FOOTER
   ======================================== */
.footer {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.85);
    padding: 60px 0 0;
}
.footer .row { margin: 0 -15px; }
.footer-section { margin-bottom: 28px; padding: 0 15px; }
.footer-section h4 {
    font-size: 17px;
    color: #fff !important;
    margin: 0 0 18px;
    font-weight: 700;
    position: relative;
    padding-bottom: 10px;
}
.footer-section h4::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 30px; height: 2px;
    background: var(--secondary-color);
}
.footer-section p { color: rgba(255,255,255,0.7); font-size: 14px; line-height: 1.8; margin: 0 0 8px; }
.footer-slogan { font-size: 13px !important; font-style: italic; margin-top: 14px !important; opacity: 0.7; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin: 0 0 8px; }
.footer-links a {
    color: rgba(255,255,255,0.7) !important;
    text-decoration: none;
    transition: color .3s;
    font-size: 14px;
}
.footer-links a:hover { color: var(--secondary-color) !important; padding-left: 4px; }
.footer-bottom {
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-bottom p { color: rgba(255,255,255,0.5); font-size: 13px; margin: 0; }

/* ========================================
   15. 浮动侧边栏 / 返回顶部
   ======================================== */
.float-sidebar {
    position: fixed;
    right: 20px;
    bottom: 30px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.float-sidebar .float-btn {
    width: 48px; height: 48px;
    border-radius: 50%;
    background: #fff;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
    transition: all .3s;
    border: none;
    font-size: 20px;
    text-decoration: none;
    position: relative;
}
.float-sidebar .float-btn:hover {
    background: var(--secondary-color);
    color: #fff;
    transform: translateY(-3px);
}
.float-sidebar .fh_top { display: none; }
.float-sidebar .float-btn .float-tip {
    position: absolute;
    right: 100%;
    margin-right: 12px;
    padding: 6px 12px;
    background: var(--text-dark);
    color: #fff;
    font-size: 12px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all .3s;
}
.float-sidebar .float-btn:hover .float-tip { opacity: 1; visibility: visible; }
.float-sidebar .float-btn .float-tip::after {
    content: "";
    position: absolute;
    left: 100%; top: 50%;
    transform: translateY(-50%);
    border: 5px solid transparent;
    border-left-color: var(--text-dark);
}
@media (max-width: 768px) {
    .float-sidebar { right: 12px; bottom: 20px; }
    .float-sidebar .float-btn { width: 42px; height: 42px; font-size: 17px; }
}

/* ========================================
   16. 响应式调整
   ======================================== */
@media (max-width: 992px) {
    section { padding: 60px 0; }
    .content-box { padding: 32px 24px; }
    .section-title { font-size: 28px; }
    .content-title { font-size: 22px; }
    .standard-item, .reason-item { flex-direction: column; }
    .standard-number, .reason-number { margin: 0 0 14px; }
    .product-item { padding: 28px 22px; }
    .product-title { font-size: 22px; }
    .dwv-definition { grid-template-columns: 1fr; }
    .dwv-letter { font-size: 50px; }
    .process-flow { flex-direction: column; }
    .process-arrow { transform: rotate(90deg); margin: 6px 0; }
    .cta-box h3 { font-size: 24px; }
    .commitment-box { padding: 36px 24px; }
    .commitment-box h3 { font-size: 24px; }
}
@media (max-width: 768px) {
    .section-title { font-size: 24px; }
    .product-item .row [class*="col-"] { float: none; width: 100%; }
}