/* =====================================================
   中国华西BIM中心官方网站 - 样式表
   主色：华西绿  #0a8043 / 深绿 #074d27
   ===================================================== */

:root {
    --color-primary: #0a8043;
    --color-primary-dark: #074d27;
    --color-primary-darker: #04321a;
    --color-primary-light: #1ea05a;
    --color-accent: #00c46a;
    --color-ink: #1a1f1d;
    --color-text: #2d3433;
    --color-muted: #6c7570;
    --color-line: #e3e8e6;
    --color-line-soft: #eef2f0;
    --color-bg: #ffffff;
    --color-bg-soft: #f6f9f7;
    --color-bg-section: #f9fbfa;
    --shadow-sm: 0 2px 8px rgba(7, 77, 39, 0.06);
    --shadow-md: 0 8px 28px rgba(7, 77, 39, 0.08);
    --shadow-lg: 0 18px 48px rgba(7, 77, 39, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --container-w: 1280px;
    --transition: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Roboto', -apple-system, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color .25s var(--transition);
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 32px;
}

/* =====================================================
   顶部导航栏
   ===================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid transparent;
    transition: all .3s var(--transition);
}

.site-header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    border-bottom-color: var(--color-line);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 32px;
    height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
}

.brand-logo {
    height: 44px;
    width: auto;
    display: block;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-name-cn {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary-dark);
    letter-spacing: .5px;
}

.brand-name-en {
    font-size: 10px;
    font-weight: 500;
    color: var(--color-muted);
    letter-spacing: 1.2px;
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    position: relative;
    padding: 10px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    transition: color .25s var(--transition), background .25s var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
    background: rgba(10, 128, 67, 0.06);
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 14px;
    right: 14px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-ink);
    border-radius: 1px;
    transition: all .3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* 移动端菜单 */
@media (max-width: 960px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu.mobile-open {
        display: flex;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 24px;
        gap: 4px;
        overflow-y: auto;
    }

    .nav-menu.mobile-open .nav-link {
        padding: 16px 20px;
        font-size: 16px;
        border-bottom: 1px solid var(--color-line);
        border-radius: 0;
    }

    .nav-menu.mobile-open .nav-link.active::after {
        display: none;
    }
}

/* =====================================================
   首屏 Hero Banner
   ===================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 120px 0 80px;
    overflow: hidden;
    background: linear-gradient(180deg, #f6f9f7 0%, #ffffff 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(10, 128, 67, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(10, 128, 67, 0.05) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: .25;
}

.glow-a {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary), transparent 70%);
    top: -200px;
    right: -100px;
}

.glow-b {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-accent), transparent 70%);
    bottom: -100px;
    left: 10%;
    opacity: .15;
}

.hero-inner {
    position: relative;
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 32px;
    display: grid;
    grid-template-columns: 1fr 1.05fr;
    gap: 60px;
    align-items: center;
    min-height: 70vh;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(10, 128, 67, 0.08);
    border: 1px solid rgba(10, 128, 67, 0.15);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-primary-dark);
    margin-bottom: 28px;
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(10, 128, 67, 0.2);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: .6; transform: scale(1.3); }
}

.hero-title {
    font-size: clamp(36px, 5vw, 60px);
    font-weight: 900;
    line-height: 1.15;
    color: var(--color-ink);
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.title-accent {
    color: var(--color-primary);
    position: relative;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 17px;
    line-height: 1.85;
    color: var(--color-muted);
    margin-bottom: 36px;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 56px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all .3s var(--transition);
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 6px 20px rgba(10, 128, 67, 0.25);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(10, 128, 67, 0.35);
}

.btn-ghost {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-ghost:hover {
    background: var(--color-primary);
    color: #fff;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding-top: 32px;
    border-top: 1px solid var(--color-line);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-primary-dark);
    line-height: 1;
    display: inline-block;
}

.stat-suffix {
    display: inline-block;
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary);
    margin-left: 2px;
    transform: translateY(-8px);
}

.stat-label {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: 6px;
}

/* Hero Right - 数字孪生预览 */
.hero-right {
    position: relative;
}

.model-frame {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 30px 80px rgba(7, 77, 39, 0.25), 0 0 0 1px rgba(10, 128, 67, 0.1);
    aspect-ratio: 16 / 9;
    background: #062c19;
}

.model-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.model-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary-dark);
    z-index: 2;
}

.pulse {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #ff4242;
    box-shadow: 0 0 0 0 rgba(255, 66, 66, 0.7);
    animation: pulse-red 1.5s infinite;
}

@keyframes pulse-red {
    0% { box-shadow: 0 0 0 0 rgba(255, 66, 66, 0.7); }
    70% { box-shadow: 0 0 0 8px rgba(255, 66, 66, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 66, 66, 0); }
}

.model-mask {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(0, 0, 0, 0.4) 100%);
    pointer-events: none;
}

.model-link {
    position: absolute;
    bottom: 16px;
    right: 16px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary-dark);
    z-index: 2;
    transition: all .25s;
}

.model-link:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

.model-caption {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 16px;
    text-align: center;
}

.model-caption strong {
    font-size: 15px;
    color: var(--color-ink);
}

.model-caption span {
    font-size: 13px;
    color: var(--color-muted);
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    font-size: 11px;
    letter-spacing: 3px;
    color: var(--color-muted);
    z-index: 2;
}

.scroll-line {
    width: 1px;
    height: 36px;
    background: linear-gradient(180deg, var(--color-primary), transparent);
    animation: scroll-anim 1.8s infinite;
}

@keyframes scroll-anim {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* =====================================================
   Section 通用
   ===================================================== */
.section {
    padding: 110px 0;
    position: relative;
}

.section-head {
    max-width: 720px;
    margin: 0 auto 64px;
    text-align: center;
}

.section-kicker {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.kicker-num {
    font-size: 14px;
    font-weight: 800;
    color: var(--color-primary);
    font-family: 'Roboto', monospace;
    letter-spacing: 1px;
}

.kicker-line {
    display: inline-block;
    width: 32px;
    height: 1px;
    background: var(--color-primary);
}

.kicker-text {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--color-primary);
}

.section-title {
    font-size: clamp(32px, 4vw, 44px);
    font-weight: 900;
    color: var(--color-ink);
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -.5px;
}

.section-desc {
    font-size: 16px;
    color: var(--color-muted);
    line-height: 1.85;
}

/* =====================================================
   板块一：中心简介
   ===================================================== */
.section-about {
    background: var(--color-bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: stretch;
    margin-bottom: 80px;
}

.about-card {
    background: linear-gradient(135deg, #ffffff 0%, #f6f9f7 100%);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-sm);
}

.about-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 20px;
    line-height: 1.4;
}

.about-card p {
    font-size: 15px;
    color: var(--color-text);
    line-height: 1.9;
    margin-bottom: 28px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.check {
    width: 22px;
    height: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.about-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.metric-card {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    color: #fff;
    position: relative;
    overflow: hidden;
    transition: transform .3s var(--transition);
}

.metric-card::before {
    content: '';
    position: absolute;
    top: -30px;
    right: -30px;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
}

.metric-card:hover {
    transform: translateY(-4px);
}

.metric-num {
    font-size: 48px;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 8px;
    display: inline-block;
}

.metric-num span {
    font-size: 18px;
    font-weight: 600;
    margin-left: 4px;
    opacity: .85;
}

.metric-label {
    font-size: 13px;
    font-weight: 500;
    opacity: .9;
    line-height: 1.4;
}

/* 组织架构 */
.structure {
    background: var(--color-bg-soft);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-xl);
    padding: 48px 32px;
}

.structure-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-ink);
    text-align: center;
    margin-bottom: 40px;
}

.org-tree {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.org-node {
    display: flex;
    justify-content: center;
}

.org-box {
    padding: 14px 28px;
    background: #fff;
    border: 1.5px solid var(--color-line);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    text-align: center;
    transition: all .25s var(--transition);
}

.org-box:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.org-box-root {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    padding: 18px 36px;
    border: none;
    box-shadow: var(--shadow-md);
}

.org-connector {
    width: 1.5px;
    height: 28px;
    background: var(--color-line);
    margin: 0;
}

.org-row {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    width: 100%;
}

.org-row-2 {
    gap: 60px;
}

.org-box-sub {
    background: rgba(10, 128, 67, 0.06);
    border-color: rgba(10, 128, 67, 0.2);
    color: var(--color-primary-dark);
}

/* =====================================================
   板块二：核心业务
   ===================================================== */
.section-services {
    background: var(--color-bg-section);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    position: relative;
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    padding: 40px 32px 32px;
    transition: all .35s var(--transition);
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .35s var(--transition);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(10, 128, 67, 0.2);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-num {
    position: absolute;
    top: 24px;
    right: 28px;
    font-size: 14px;
    font-weight: 800;
    color: var(--color-line);
    font-family: 'Roboto', monospace;
    letter-spacing: 1px;
}

.service-icon {
    width: 56px;
    height: 56px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    background: rgba(10, 128, 67, 0.08);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.service-icon svg {
    width: 32px;
    height: 32px;
}

.service-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 14px;
}

.service-card p {
    font-size: 14px;
    color: var(--color-muted);
    line-height: 1.8;
    margin-bottom: 20px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-tags li {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-primary-dark);
    padding: 4px 12px;
    background: rgba(10, 128, 67, 0.08);
    border-radius: 100px;
}

.service-card-wide {
    grid-column: span 3;
    background: linear-gradient(135deg, #062c19 0%, #0a8043 100%);
    color: #fff;
    border: none;
    position: relative;
    overflow: hidden;
}

.service-card-wide::before {
    background: linear-gradient(90deg, var(--color-accent), #fff);
}

.service-card-wide h3,
.service-card-wide p {
    color: #fff;
}

.service-card-wide p {
    opacity: .9;
}

.service-card-wide .service-icon {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.service-card-wide .service-num {
    color: rgba(255, 255, 255, 0.3);
}

.service-card-wide .service-tags li {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.service-icon-lg {
    width: 72px;
    height: 72px;
}

.service-icon-lg svg {
    width: 40px;
    height: 40px;
}

.service-card-wide h3 {
    font-size: 26px;
}

/* =====================================================
   数字孪生大图区
   ===================================================== */
.section-twin-highlight {
    padding: 0 0 110px;
    background: var(--color-bg-section);
}

.twin-feature {
    position: relative;
    display: block;
    border-radius: var(--radius-xl);
    overflow: hidden;
    height: 540px;
    box-shadow: var(--shadow-lg);
    transition: all .4s var(--transition);
}

.twin-feature:hover {
    transform: translateY(-4px);
    box-shadow: 0 30px 80px rgba(7, 77, 39, 0.35);
}

.twin-feature-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transition: transform .8s var(--transition);
}

.twin-feature:hover .twin-feature-bg {
    transform: scale(1.05);
}

.twin-feature-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, rgba(6, 44, 25, 0.85) 0%, rgba(10, 128, 67, 0.5) 60%, rgba(0, 0, 0, 0.6) 100%);
}

.twin-feature-content {
    position: relative;
    padding: 80px 64px;
    max-width: 720px;
    color: #fff;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.twin-tag {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1.5px;
    margin-bottom: 24px;
    width: fit-content;
}

.twin-tag .pulse {
    background: #ff4242;
}

.twin-feature-content h2 {
    font-size: clamp(32px, 4vw, 52px);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -.5px;
}

.twin-feature-content p {
    font-size: 16px;
    line-height: 1.85;
    opacity: .92;
    margin-bottom: 36px;
    max-width: 540px;
}

.twin-features-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 36px;
}

.twin-feature-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.tfi-num {
    font-size: 18px;
    font-weight: 800;
    color: var(--color-accent);
    font-family: 'Roboto', monospace;
    letter-spacing: 1px;
    flex-shrink: 0;
    line-height: 1.4;
}

.tfi-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.tfi-text strong {
    font-size: 16px;
    font-weight: 700;
}

.tfi-text span {
    font-size: 13px;
    opacity: .8;
    line-height: 1.5;
}

.twin-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: #fff;
    color: var(--color-primary-dark);
    border-radius: 100px;
    font-size: 15px;
    font-weight: 700;
    width: fit-content;
    transition: all .3s var(--transition);
}

.twin-feature:hover .twin-cta {
    background: var(--color-primary);
    color: #fff;
}

/* =====================================================
   板块三：项目案例
   ===================================================== */
.section-cases {
    background: var(--color-bg);
}

.case-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
}

.case-tab {
    padding: 10px 22px;
    background: transparent;
    border: 1px solid var(--color-line);
    color: var(--color-text);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all .25s var(--transition);
}

.case-tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.case-tab.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.case-card {
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all .3s var(--transition);
    cursor: pointer;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(10, 128, 67, 0.2);
}

.case-thumb {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.case-thumb::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    z-index: 1;
}

.case-thumb-1::before { background: linear-gradient(135deg, #1a3a2e 0%, #0a8043 100%); }
.case-thumb-2::before { background: linear-gradient(135deg, #0c3d2a 0%, #1ea05a 100%); }
.case-thumb-3::before { background: linear-gradient(135deg, #2d4f3a 0%, #00c46a 100%); }
.case-thumb-4::before { background: linear-gradient(135deg, #062c19 0%, #0a8043 60%, #1ea05a 100%); }
.case-thumb-5::before { background: linear-gradient(135deg, #0a8043 0%, #04321a 100%); }
.case-thumb-6::before { background: linear-gradient(135deg, #1ea05a 0%, #074d27 100%); }

.case-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 32px 32px;
    z-index: 2;
}

.case-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-primary-dark);
    font-size: 12px;
    font-weight: 700;
    border-radius: 100px;
    z-index: 3;
}

.case-body {
    padding: 24px 24px 28px;
}

.case-body h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 12px;
    line-height: 1.4;
}

.case-body p {
    font-size: 14px;
    color: var(--color-muted);
    line-height: 1.8;
    margin-bottom: 16px;
}

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 12px;
    color: var(--color-primary);
    font-weight: 500;
}

.case-card.hide {
    display: none;
}

/* =====================================================
   板块四：技术优势
   ===================================================== */
.section-advantage {
    background: linear-gradient(180deg, var(--color-bg-section) 0%, var(--color-bg) 100%);
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

.adv-card {
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: all .35s var(--transition);
    position: relative;
    overflow: hidden;
}

.adv-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .4s var(--transition);
}

.adv-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.adv-card:hover::before {
    transform: scaleX(1);
}

.adv-icon-wrap {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    background: rgba(10, 128, 67, 0.08);
    border-radius: var(--radius-md);
    margin-bottom: 22px;
    transition: all .3s var(--transition);
}

.adv-card:hover .adv-icon-wrap {
    background: var(--color-primary);
    color: #fff;
}

.adv-icon-wrap svg {
    width: 32px;
    height: 32px;
}

.adv-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 12px;
}

.adv-card p {
    font-size: 14px;
    color: var(--color-muted);
    line-height: 1.8;
    margin-bottom: 18px;
}

.adv-card ul li {
    position: relative;
    padding-left: 16px;
    font-size: 13px;
    color: var(--color-text);
    line-height: 1.9;
    font-weight: 500;
}

.adv-card ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
}

/* 荣誉数据栏 */
.honor-bar {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    border-radius: var(--radius-xl);
    padding: 48px 32px;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.honor-bar::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08), transparent 70%);
}

.honor-item {
    text-align: center;
    position: relative;
    z-index: 1;
}

.honor-num {
    font-size: 44px;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 8px;
    font-family: 'Roboto', sans-serif;
}

.honor-num span {
    font-size: 20px;
    font-weight: 700;
    margin-left: 2px;
}

.honor-label {
    font-size: 13px;
    font-weight: 500;
    opacity: .9;
}

/* =====================================================
   板块五：新闻资讯
   ===================================================== */
.section-news {
    background: var(--color-bg);
}

.news-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 28px;
}

.news-card {
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all .3s var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(10, 128, 67, 0.2);
}

.news-thumb {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.news-thumb::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
}

.news-thumb-1::before { background: linear-gradient(135deg, #062c19, #0a8043); }
.news-thumb-2::before { background: linear-gradient(135deg, #0c3d2a, #1ea05a); }
.news-thumb-3::before { background: linear-gradient(135deg, #074d27, #00c46a); }
.news-thumb-4::before { background: linear-gradient(135deg, #2d4f3a, #0a8043); }
.news-thumb-5::before { background: linear-gradient(135deg, #1ea05a, #04321a); }
.news-thumb-6::before { background: linear-gradient(135deg, #0a8043, #1a3a2e); }

.news-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 24px 24px;
    z-index: 2;
}

.news-cat {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-primary-dark);
    font-size: 11px;
    font-weight: 700;
    border-radius: 100px;
    z-index: 3;
}

.news-date {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    border-radius: 100px;
    backdrop-filter: blur(8px);
    z-index: 3;
}

.news-card-feature {
    grid-row: span 2;
}

.news-card-feature .news-thumb {
    aspect-ratio: 16 / 12;
    flex: 1;
}

.news-card-feature .news-body {
    padding: 32px;
}

.news-card-feature h3 {
    font-size: 22px;
}

.news-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-body h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 10px;
    line-height: 1.5;
}

.news-body p {
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.7;
    margin-bottom: 14px;
    flex: 1;
}

.news-more {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
}

.news-card:hover .news-more {
    color: var(--color-primary-dark);
}

/* =====================================================
   底部 Footer
   ===================================================== */
.site-footer {
    background: linear-gradient(180deg, #0a1612 0%, #062c19 100%);
    color: #c8d4ce;
    padding: 80px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2.5fr;
    gap: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand {
    display: flex;
    align-items: flex-start;
    gap: 18px;
}

.footer-logo {
    height: 64px;
    width: auto;
    background: #fff;
    padding: 8px;
    border-radius: var(--radius-md);
}

.footer-brand-text h3 {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    line-height: 1.5;
    margin-bottom: 10px;
}

.footer-brand-text p {
    font-size: 14px;
    color: #8a9a92;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1.4fr 1fr;
    gap: 32px;
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 22px;
    position: relative;
    padding-bottom: 12px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--color-primary-light);
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    font-size: 14px;
    color: #a8b4ae;
    transition: all .25s;
}

.footer-col ul li a:hover {
    color: var(--color-primary-light);
    padding-left: 4px;
}

.contact-list li {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 18px;
}

.contact-ico {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 128, 67, 0.2);
    border-radius: 50%;
    color: var(--color-primary-light);
}

.contact-ico svg {
    width: 18px;
    height: 18px;
}

.contact-list li div {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-list strong {
    font-size: 12px;
    font-weight: 600;
    color: #8a9a92;
    letter-spacing: 1px;
}

.contact-list span {
    font-size: 14px;
    color: #c8d4ce;
    line-height: 1.5;
}

.footer-qr {
    text-align: left;
}

.qr-box {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}

.qr-placeholder {
    width: 100px;
    height: 100px;
    background: #fff;
    border-radius: var(--radius-md);
    padding: 8px;
    display: grid;
    place-items: center;
}

.qr-inner {
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 2px;
}

.qr-cell {
    background: var(--color-ink);
    border-radius: 1px;
}

.qr-cell-dark {
    background: var(--color-primary);
}

.qr-box p {
    font-size: 12px;
    color: #8a9a92;
}

.footer-bottom {
    padding: 28px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: #6f7d76;
}

.footer-slogan {
    color: var(--color-primary-light);
    font-weight: 500;
    letter-spacing: 1px;
}

/* =====================================================
   入场动画
   ===================================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .8s var(--transition), transform .8s var(--transition);
}

.reveal.in {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   响应式
   ===================================================== */
@media (max-width: 1100px) {
    .nav-link { padding: 10px 10px; font-size: 13px; }
    .brand-name-cn { font-size: 16px; }
}

@media (max-width: 960px) {
    .nav-menu { display: none; }
    .nav-toggle { display: flex; }

    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }

    .about-grid { grid-template-columns: 1fr; }
    .service-grid { grid-template-columns: repeat(2, 1fr); }
    .service-card-wide { grid-column: span 2; }

    .case-grid { grid-template-columns: repeat(2, 1fr); }

    .advantage-grid { grid-template-columns: repeat(2, 1fr); }
    .honor-bar { grid-template-columns: repeat(3, 1fr); }

    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .news-card-feature { grid-row: auto; grid-column: span 2; }

    .footer-top { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }

    .twin-feature-content { padding: 48px 32px; }
    .twin-features-list { grid-template-columns: 1fr; gap: 16px; }
}

@media (max-width: 640px) {
    .container { padding: 0 20px; }
    .nav-container { padding: 0 20px; height: 64px; }
    .brand-logo { height: 36px; }
    .brand-name-en { display: none; }
    .brand-name-cn { font-size: 14px; }

    .section { padding: 80px 0; }
    .section-head { margin-bottom: 40px; }

    .hero { padding: 100px 0 60px; }
    .hero-actions { flex-direction: column; align-items: stretch; }

    .about-card { padding: 28px; }
    .about-features { grid-template-columns: 1fr; }

    .service-grid { grid-template-columns: 1fr; }
    .service-card-wide { grid-column: span 1; }

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

    .advantage-grid { grid-template-columns: 1fr; }
    .honor-bar { grid-template-columns: repeat(2, 1fr); gap: 28px; padding: 32px 20px; }
    .honor-num { font-size: 32px; }

    .news-grid { grid-template-columns: 1fr; }
    .news-card-feature { grid-column: span 1; }

    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}