/* ========================================
   全局样式
   ======================================== */

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

:root {
    --primary-color: #1E88E5;
    --secondary-color: #43A047;
    --text-color: #333333;
    --light-gray: #F5F5F5;
    --border-color: #EEEEEE;
    --white: #FFFFFF;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
}

/* ========================================
   容器和基础布局
   ======================================== */

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

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
}

/* ========================================
   导航栏
   ======================================== */

.navbar {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 40px;
}

.navbar-brand-link {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.navbar-logo {
    height: 56px;
    width: auto;
    display: block;
    flex-shrink: 0;
}

.navbar-brand-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
    white-space: nowrap;
}

.navbar-brand h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.navbar-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 14px;
    transition: color 0.3s ease;
}

.navbar-menu a:hover {
    color: var(--primary-color);
}

.navbar-menu .cta-button {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.navbar-menu .cta-button:hover {
    background-color: #1565C0;
}

/* 手机端导航控件：桌面默认隐藏；语言组在桌面还原为普通菜单项 */
.navbar-actions,
.navbar-backdrop,
.navbar-drawer-head {
    display: none;
}

.navbar-lang,
.navbar-langs {
    display: contents;
}

@media (max-width: 900px) {
    .navbar {
        box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.04);
    }

    .navbar .container {
        position: relative;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        min-height: 58px;
        padding: 8px 16px;
    }

    .navbar-brand {
        min-width: 0;
        flex: 1;
    }

    .navbar-brand-link {
        align-items: center;
        gap: 8px;
        max-width: 100%;
        line-height: 1;
    }

    .navbar-logo {
        height: 36px;
    }

    .navbar-brand-text,
    .navbar-brand h1 {
        display: flex;
        align-items: center;
        font-size: 16px;
        letter-spacing: 0.5px;
        line-height: 1;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .navbar-actions {
        display: flex;
        align-items: center;
        gap: 8px;
        flex-shrink: 0;
        margin-left: auto;
    }

    .navbar-call {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        height: 34px;
        padding: 0 12px;
        border: 1px solid rgba(30, 136, 229, 0.28);
        background: rgba(30, 136, 229, 0.08);
        color: var(--primary-color);
        font-size: 12px;
        font-weight: 600;
        letter-spacing: 0.3px;
        line-height: 1;
        text-decoration: none;
        white-space: nowrap;
        transition: background 0.2s ease, border-color 0.2s ease;
    }

    .navbar-call:hover,
    .navbar-call:focus-visible {
        background: rgba(30, 136, 229, 0.14);
        border-color: rgba(30, 136, 229, 0.45);
        outline: none;
    }

    .navbar-toggle {
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 5px;
        width: 40px;
        height: 34px;
        padding: 0;
        border: 1px solid var(--border-color);
        background: var(--white);
        cursor: pointer;
        transition: border-color 0.2s ease, background 0.2s ease;
    }

    .navbar-toggle:hover,
    .navbar-toggle:focus-visible {
        border-color: rgba(30, 136, 229, 0.45);
        outline: none;
    }

    .navbar-toggle-bar {
        display: block;
        width: 18px;
        height: 2px;
        background: var(--text-color);
        transition: transform 0.25s ease, opacity 0.2s ease;
        transform-origin: center;
    }

    .navbar.is-open .navbar-toggle {
        border-color: rgba(30, 136, 229, 0.45);
        background: rgba(30, 136, 229, 0.08);
    }

    .navbar.is-open .navbar-toggle-bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .navbar.is-open .navbar-toggle-bar:nth-child(2) {
        opacity: 0;
    }

    .navbar.is-open .navbar-toggle-bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .navbar-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 110;
        background: rgba(15, 28, 42, 0.48);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 0.28s ease, visibility 0.28s ease;
    }

    .navbar.is-open .navbar-backdrop {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

    .navbar-menu {
        position: fixed;
        top: 0;
        right: 0;
        z-index: 120;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        width: min(86vw, 320px);
        height: 100%;
        height: 100dvh;
        margin: 0;
        padding: 0 0 calc(24px + env(safe-area-inset-bottom, 0px));
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        list-style: none;
        background:
            linear-gradient(180deg, rgba(245, 249, 252, 0.95) 0%, #ffffff 120px),
            #ffffff;
        box-shadow: -16px 0 40px rgba(15, 28, 42, 0.16);
        transform: translateX(105%);
        pointer-events: none;
        visibility: hidden;
        transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.3s;
    }

    .navbar.is-open .navbar-menu {
        transform: translateX(0);
        pointer-events: auto;
        visibility: visible;
    }

    .navbar-drawer-head {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        min-height: 48px;
        padding: 10px 16px;
        border-bottom: 1px solid var(--border-color);
    }

    .navbar-drawer-title {
        color: var(--text-color);
        font-size: 13px;
        font-weight: 700;
        letter-spacing: 1px;
        line-height: 1;
    }

    .navbar-drawer-close {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        border: 1px solid var(--border-color);
        background: var(--white);
        color: var(--text-color);
        font-size: 20px;
        line-height: 1;
        cursor: pointer;
    }

    .navbar-menu > li {
        margin: 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .navbar-menu > li.navbar-lang {
        margin-top: auto;
        border-bottom: none;
    }

    .navbar-menu a {
        display: flex;
        align-items: center;
        justify-content: flex-start;
        height: 42px;
        min-height: 42px;
        padding: 0 16px;
        color: var(--text-color);
        font-size: 14px;
        font-weight: 500;
        letter-spacing: 0.3px;
        line-height: 1;
        transition: background 0.2s ease, color 0.2s ease;
    }

    .navbar-menu a:hover,
    .navbar-menu a:focus-visible {
        background: rgba(30, 136, 229, 0.06);
        color: var(--primary-color);
        outline: none;
    }

    .navbar-menu .cta-button {
        justify-content: center;
        height: 40px;
        min-height: 40px;
        margin: 12px 16px 6px;
        padding: 0 14px;
        border-radius: 0;
        background: var(--primary-color);
        color: var(--white);
        font-size: 14px;
        font-weight: 600;
        line-height: 1;
    }

    .navbar-menu .cta-button:hover,
    .navbar-menu .cta-button:focus-visible {
        background: #1565C0;
        color: var(--white);
    }

    .navbar-menu > li:has(.cta-button) {
        border-bottom: none;
        margin-top: 4px;
    }

    .navbar-lang {
        display: list-item;
    }

    .navbar-langs {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 14px 16px 0;
        border-top: 1px solid var(--border-color);
    }

    .navbar-langs a {
        flex: 1;
        justify-content: center;
        height: 34px;
        min-height: 34px;
        padding: 0 10px;
        border: 1px solid var(--border-color);
        background: var(--light-gray);
        color: var(--text-color);
        font-size: 12px;
        font-weight: 600;
        line-height: 1;
    }

    body.nav-open {
        overflow: hidden;
        touch-action: none;
    }
}

@media (max-width: 380px) {
    .navbar-call {
        padding: 0 10px;
        font-size: 12px;
    }

    .navbar-brand-text {
        font-size: 15px;
    }
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    background: linear-gradient(135deg, #1E88E5 0%, #43A047 100%);
    color: var(--white);
    padding: 96px 0;
    text-align: center;
}

.hero-content h1,
.hero-content h2 {
    font-size: 56px;
    font-weight: 800;
    margin: 0 0 24px;
    line-height: 1.15;
    color: #FFFFFF;
    letter-spacing: 4px;
    font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei UI",
        "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
    text-shadow:
        0 2px 4px rgba(0, 0, 0, 0.15),
        0 8px 24px rgba(15, 35, 70, 0.25);
    position: relative;
    display: inline-block;
    padding-bottom: 18px;
}

.hero-content h1::after,
.hero-content h2::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 72px;
    height: 4px;
    border-radius: 2px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.35));
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.35);
}

.hero-content > p:first-of-type {
    font-size: 20px;
    margin-bottom: 8px;
    font-weight: 500;
}

.hero-subtitle {
    font-size: 16px;
    margin-bottom: 32px;
    opacity: 0.95;
}

.hero .button {
    margin: 0 12px;
}

@media (max-width: 768px) {
    .hero {
        padding: 64px 0;
    }
    
    .hero-content h1,
    .hero-content h2 {
        font-size: 40px;
        letter-spacing: 3px;
        padding-bottom: 14px;
    }

    .hero-content h1::after,
    .hero-content h2::after {
        width: 56px;
        height: 3px;
    }

    .hero-content > p:first-of-type {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 48px 0;
    }

    .hero-content h1,
    .hero-content h2 {
        font-size: 30px;
        letter-spacing: 2px;
        padding-bottom: 12px;
    }

    .hero-content h1::after,
    .hero-content h2::after {
        width: 44px;
        height: 3px;
    }
    
    .hero .button {
        display: block;
        margin: 12px 0;
    }
}

/* ========================================
   按钮
   ======================================== */

.button {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.button-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.button-primary:hover {
    background-color: #1565C0;
    box-shadow: var(--shadow-lg);
}

.button-secondary {
    background-color: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.button-secondary:hover {
    background-color: #F5F5F5;
}

.button-large {
    padding: 16px 48px;
    font-size: 18px;
}

/* ========================================
   通用区域样式
   ======================================== */

section {
    padding: 80px 0;
}

section h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
    color: var(--text-color);
}

.section-subtitle {
    font-size: 18px;
    color: #666666;
    text-align: center;
    margin-bottom: 48px;
}

@media (max-width: 768px) {
    section {
        padding: 48px 0;
    }
    
    section h2 {
        font-size: 32px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
}

/* ========================================
   服务区域
   ======================================== */

.services {
    background-color: var(--light-gray);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.service-card {
    background-color: var(--white);
    padding: 32px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.service-card h2,
.service-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.service-card p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
    color: #666666;
}

.service-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: color 0.3s ease;
}

.service-card a:hover {
    color: #1565C0;
}

/* ========================================
   为什么选择我们
   ======================================== */

.why-us {
    background-color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature {
    text-align: center;
}

.feature h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.feature p {
    font-size: 14px;
    line-height: 1.8;
    color: #666666;
}

/* ========================================
   售后服务
   ======================================== */

.after-sales {
    background-color: var(--light-gray);
}

.after-sales-case {
    display: grid;
    grid-template-columns: minmax(260px, 360px) 1fr;
    gap: 40px;
    align-items: center;
    background-color: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.after-sales-image {
    text-align: center;
}

.after-sales-image img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.after-sales-label {
    display: inline-block;
    margin-bottom: 12px;
    padding: 6px 12px;
    border-radius: 999px;
    background-color: rgba(67, 160, 71, 0.12);
    color: var(--secondary-color);
    font-size: 14px;
    font-weight: 600;
}

.after-sales-content h3 {
    font-size: 26px;
    line-height: 1.4;
    margin-bottom: 20px;
    color: var(--text-color);
}

.after-sales-content p {
    font-size: 15px;
    line-height: 1.9;
    margin-bottom: 16px;
    color: #666666;
}

.after-sales-points {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.after-sales-points span {
    padding: 10px 14px;
    border-radius: 6px;
    background-color: var(--light-gray);
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
}

.after-sales-actions {
    text-align: center;
    margin-top: 40px;
}

@media (max-width: 768px) {
    .after-sales-case {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 24px;
    }

    .after-sales-content h3 {
        font-size: 22px;
    }
}

/* ========================================
   售后服务详情页
   ======================================== */

.after-sales-hero {
    padding: 64px 0;
    background: linear-gradient(135deg, #1E88E5 0%, #43A047 100%);
}

.after-sales-hero h1 {
    color: var(--white);
    font-size: 44px;
    margin-bottom: 16px;
}

.after-sales-hero p {
    color: var(--white);
    font-size: 18px;
}

.after-sales-page-intro,
.after-sales-scope {
    background-color: var(--white);
}

.after-sales-intro-card {
    max-width: 920px;
    margin: 0 auto;
    padding: 40px;
    border-radius: 12px;
    background-color: var(--light-gray);
    box-shadow: var(--shadow);
}

.after-sales-intro-card h2 {
    margin-bottom: 20px;
    text-align: left;
    font-size: 30px;
    line-height: 1.4;
}

.after-sales-intro-card p {
    font-size: 16px;
    line-height: 1.9;
    margin-bottom: 16px;
    color: #666666;
}

.after-sales-story {
    background-color: var(--light-gray);
}

.after-sales-story-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 40px;
}

.after-sales-story-card,
.after-sales-scope-card {
    background-color: var(--white);
    padding: 32px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.after-sales-story-card h3,
.after-sales-scope-card h3 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.after-sales-story-card p,
.after-sales-scope-card p {
    font-size: 15px;
    line-height: 1.9;
    margin-bottom: 12px;
    color: #666666;
}

.after-sales-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.after-sales-gallery figure {
    margin: 0;
    overflow: hidden;
    border-radius: 10px;
    background-color: var(--white);
    box-shadow: var(--shadow);
}

.after-sales-gallery img {
    display: block;
    width: 100%;
    height: auto;
}

.after-sales-gallery figcaption {
    padding: 12px 14px;
    font-size: 13px;
    line-height: 1.6;
    color: #666666;
}

.after-sales-scope-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 28px;
}

@media (max-width: 768px) {
    .after-sales-hero {
        padding: 48px 0;
    }

    .after-sales-hero h1 {
        font-size: 34px;
    }

    .after-sales-intro-card,
    .after-sales-story-card,
    .after-sales-scope-card {
        padding: 24px;
    }

    .after-sales-intro-card h2 {
        font-size: 24px;
    }
}

/* ========================================
   客户案例
   ======================================== */

.cases-preview {
    background-color: var(--light-gray);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.case-card {
    background-color: var(--white);
    padding: 32px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--secondary-color);
}

.case-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-color);
}

.case-card p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 12px;
    color: #666666;
}

.case-card strong {
    color: var(--primary-color);
}

.case-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    margin-top: 12px;
    display: inline-block;
}

/* ========================================
   隔音知识
   ======================================== */

.knowledge {
    background-color: var(--white);
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.knowledge-card {
    background-color: var(--light-gray);
    padding: 32px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.knowledge-card:hover {
    background-color: var(--white);
    box-shadow: var(--shadow);
}

.knowledge-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.knowledge-card p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
    color: #666666;
}

.knowledge-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
}

.section-more {
    margin-top: 32px;
    text-align: center;
}

.knowledge-list-hero,
.article-hero {
    padding: 64px 0;
    background: linear-gradient(135deg, #1E88E5 0%, #43A047 100%);
    color: var(--white);
}

.knowledge-list-hero .container,
.article-hero .container {
    max-width: 980px;
}

.knowledge-list-hero h1,
.article-hero h1 {
    color: var(--white);
    font-size: 42px;
    line-height: 1.3;
    margin-bottom: 18px;
}

.knowledge-list-hero p,
.article-hero p {
    max-width: 780px;
    color: rgba(255, 255, 255, 0.94);
    font-size: 18px;
    line-height: 1.8;
}

.article-kicker {
    display: block;
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    font-weight: 700;
}

.knowledge-list {
    padding: 64px 0 80px;
    background: var(--light-gray);
}

.knowledge-topic-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 28px;
}

.knowledge-topic-bar span {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--white);
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
}

.article-list-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

.article-card {
    display: flex;
    min-height: 260px;
    flex-direction: column;
    padding: 28px;
    border-radius: 8px;
    background: var(--white);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.article-card-featured {
    grid-column: span 2;
    background: linear-gradient(135deg, #FFFFFF 0%, #F0F7FF 55%, #F0FAF0 100%);
    border-left: 4px solid var(--secondary-color);
}

.article-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.article-card-meta span {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(30, 136, 229, 0.1);
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 600;
}

.article-card h2 {
    margin-bottom: 14px;
    text-align: left;
    font-size: 22px;
    line-height: 1.45;
}

.article-card h2 a {
    color: var(--text-color);
    text-decoration: none;
}

.article-card h2 a:hover,
.article-card-link:hover {
    color: #1565C0;
}

.article-card p {
    flex: 1;
    color: #666666;
    font-size: 15px;
    line-height: 1.8;
}

.article-card-link {
    display: inline-block;
    margin-top: 20px;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
}

.article-layout {
    padding: 64px 0 80px;
    background: var(--white);
}

.article-layout .container {
    display: grid;
    grid-template-columns: minmax(0, 780px) minmax(260px, 320px);
    gap: 48px;
    align-items: start;
}

.article-detail {
    max-width: 780px;
}

.article-detail h2 {
    margin-top: 44px;
    margin-bottom: 16px;
    text-align: left;
    color: var(--primary-color);
    font-size: 30px;
    line-height: 1.4;
}

.article-detail h2:first-child {
    margin-top: 0;
}

.article-detail h3 {
    margin-top: 30px;
    margin-bottom: 12px;
    color: var(--text-color);
    font-size: 22px;
    line-height: 1.45;
}

.article-detail h4 {
    margin-top: 22px;
    margin-bottom: 10px;
    color: #555555;
    font-size: 18px;
    line-height: 1.45;
}

.article-detail p,
.article-detail li {
    color: #555555;
    font-size: 16px;
    line-height: 1.9;
}

.article-detail p {
    margin-bottom: 16px;
}

.article-detail ul,
.article-detail ol {
    margin: 0 0 18px 24px;
}

.article-detail li {
    margin-bottom: 8px;
}

.article-detail strong {
    color: var(--text-color);
}

.article-table-wrap {
    width: 100%;
    margin: 20px 0 28px;
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--white);
}

.article-table {
    width: 100%;
    min-width: 640px;
    border-collapse: collapse;
    font-size: 14px;
}

.article-table th,
.article-table td {
    padding: 13px 14px;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
    vertical-align: top;
}

.article-table th {
    background: var(--primary-color);
    color: var(--white);
    font-weight: 700;
}

.article-table tr:last-child td {
    border-bottom: none;
}

.article-next-step {
    position: sticky;
    top: 112px;
    padding: 28px;
    border-radius: 8px;
    background: var(--light-gray);
    border-left: 4px solid var(--secondary-color);
}

.article-next-step h2 {
    margin-bottom: 12px;
    text-align: left;
    color: var(--text-color);
    font-size: 22px;
    line-height: 1.4;
}

.article-next-step p {
    margin-bottom: 20px;
    color: #666666;
    font-size: 15px;
    line-height: 1.8;
}

@media (max-width: 900px) {
    .article-list-grid,
    .article-layout .container {
        grid-template-columns: 1fr;
    }

    .article-card-featured {
        grid-column: auto;
    }

    .article-next-step {
        position: static;
    }
}

@media (max-width: 768px) {
    .knowledge-list-hero,
    .article-hero {
        padding: 48px 0;
    }

    .knowledge-list-hero h1,
    .article-hero h1 {
        font-size: 32px;
    }

    .knowledge-list-hero p,
    .article-hero p {
        font-size: 16px;
    }

    .article-card {
        min-height: auto;
        padding: 24px;
    }

    .article-detail h2 {
        font-size: 25px;
    }

    .article-detail h3 {
        font-size: 20px;
    }
}

/* ========================================
   行动号召
   ======================================== */

.cta {
    background: linear-gradient(135deg, #1E88E5 0%, #43A047 100%);
    color: var(--white);
    text-align: center;
    padding: 80px 0;
}

.cta h2 {
    color: var(--white);
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 32px;
}

/* ========================================
   页脚
   ======================================== */

.footer {
    background-color: #2C3E50;
    color: #ECEFF1;
    padding: 48px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--white);
}

.footer-section p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 8px;
}

.footer-section a {
    color: #ECEFF1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 8px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.footer-bottom {
    background-color: #1A252F;
    padding: 24px 0;
    text-align: center;
    font-size: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom a {
    color: #ECEFF1;
    text-decoration: none;
    margin: 0 8px;
}

/* ========================================
   响应式设计
   ======================================== */

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .social-links {
        flex-wrap: wrap;
    }
}

/* ========================================
   无障碍和SEO优化
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    padding: 0;
}

a {
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 跳过链接 */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ========================================
   城市落地页
   ======================================== */

.city-hero {
    padding: 48px 0;
    background: linear-gradient(135deg, #1E88E5 0%, #43A047 100%);
    text-align: center;
}

.city-hero h1 {
    color: var(--white);
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

.city-hero p {
    color: var(--white);
    font-size: 16px;
    margin-bottom: 24px;
    opacity: 0.95;
}

.city-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    margin-bottom: 16px;
}

.city-content {
    padding: 64px 0;
}

.city-section {
    margin-bottom: 48px;
}

.city-section h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.city-section p {
    font-size: 16px;
    line-height: 1.8;
    color: #666666;
    margin-bottom: 12px;
}

.city-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    list-style: none;
    margin-top: 20px;
    padding: 0;
}

.city-tags li {
    background: var(--light-gray);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.scene-list {
    list-style: none;
    padding: 0;
    margin-top: 12px;
}

.scene-list li {
    font-size: 15px;
    line-height: 1.8;
    color: #666666;
    padding: 12px 16px;
    margin-bottom: 10px;
    background: var(--light-gray);
    border-radius: 8px;
    border-left: 3px solid var(--secondary-color);
}

.scene-list strong {
    color: var(--primary-color);
}

.price-note {
    font-size: 13px;
    color: #999999;
    line-height: 1.7;
    margin-top: 12px;
    padding: 12px 16px;
    background: #F9F9F9;
    border-radius: 4px;
    border-left: 3px solid var(--border-color);
}

.city-case-card {
    background: var(--light-gray);
    padding: 32px;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

.city-case-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-color);
}

.city-case-card p {
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 10px;
}

.city-case-card strong {
    color: var(--primary-color);
}

.reviews-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.review-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin: 0;
}

.review-card p {
    font-size: 15px;
    line-height: 1.7;
    color: #555555;
    margin-bottom: 8px;
    font-style: italic;
}

.review-card cite {
    font-size: 13px;
    color: #999999;
    font-style: normal;
}

.city-faq dt {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    margin-top: 20px;
    margin-bottom: 8px;
}

.city-faq dd {
    font-size: 15px;
    line-height: 1.8;
    color: #666666;
    margin-left: 0;
    padding-left: 16px;
    border-left: 3px solid var(--primary-color);
}

.city-national-back {
    background: linear-gradient(135deg, #f0f7ff 0%, #f0faf0 100%);
    padding: 32px;
    border-radius: 8px;
    margin-top: 48px;
}

.city-national-back h2 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.city-national-back p {
    font-size: 15px;
    line-height: 1.8;
    color: #666666;
    margin-bottom: 8px;
}

.city-national-back a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

.city-national-back .hotline {
    font-size: 18px;
    font-weight: 600;
    margin-top: 16px;
}

.city-national-back .hotline a {
    color: var(--secondary-color);
}

@media (max-width: 768px) {
    .city-hero h1 {
        font-size: 26px;
    }

    .city-case-card {
        padding: 24px 20px;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }
}