* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --bg: #ffffff;
    --ink: #1f2530;
    --ink-2: #3a4353;
    --muted: #5c6470;
    --line: #e5e7eb;
    --card: #f6f7f9;
    --thumb: #eceef1;
    --brand: #1e4a3c;
    --brand-2: #2f6b56;
    --brand-3: #3a7d66;
    --accent: #b5895a;
    --accent-soft: #f3e9dc;
}
html { scroll-behavior: smooth; }
body {
    font-family: "Lato", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.7;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }

/* 图片禁止下载：禁止选中/拖拽/长按保存 */
img {
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
    -webkit-touch-callout: none;
    pointer-events: none;
    -webkit-user-select: none;
}

/* 导航 */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    height: 90px;
    padding: 0 34px;
    background: rgba(255,255,255,0.92);
    border-bottom: 1px solid var(--line);
    color: var(--ink);
}
.nav .logo { display: flex; align-items: center; gap: 12px; height: 62px; }
.nav .logo a { display: flex; align-items: center; gap: 12px; height: 100%; }
.nav .logo img { height: 100%; width: auto; display: block; }
.nav .logo .brand { display: flex; flex-direction: column; line-height: 1.2; }
.nav .logo .brand .cn { font-size: 16px; font-weight: 700; color: var(--ink); letter-spacing: 2px; }
.nav .logo .brand .en { font-size: 10px; letter-spacing: 3px; color: #777777; text-transform: uppercase; }
.nav ul { display: flex; gap: 22px; list-style: none; align-items: center; height: 100%; }
.nav ul a { font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--ink-2); font-weight: 600; }
.nav ul a:hover, .nav ul a.active { color: var(--brand); }

/* 汉堡按钮（移动端） */
.nav-toggle {
    display: none;
    flex-direction: column; justify-content: center; gap: 5px;
    width: 44px; height: 44px; padding: 10px;
    background: transparent; border: none; cursor: pointer;
}
.nav-toggle span {
    display: block; width: 100%; height: 2px;
    background: var(--ink); border-radius: 1px;
    transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 下拉 */
.has-drop { position: relative; }
.has-drop .drop {
    position: absolute; top: 100%; left: 0; padding-top: 12px;
    display: none; min-width: 160px;
}
.has-drop:hover .drop { display: block; }
.has-drop .drop ul { display: block; background: #ffffff; border: 1px solid var(--line); padding: 8px 0; box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.has-drop .drop ul a { display: block; padding: 8px 16px; font-size: 11px; letter-spacing: 1px; color: #555555; }
.has-drop .drop ul a:hover { color: var(--ink); background: var(--card); }

/* 通用 */
section { padding: 64px 40px; }
.wrap { max-width: 1160px; margin: 0 auto; }
.eyebrow { font-size: 12px; letter-spacing: 4px; text-transform: uppercase; color: var(--brand-2); margin-bottom: 20px; font-weight: 600; }
h2.title {
    font-size: clamp(28px, 4.5vw, 52px);
    font-weight: 500; letter-spacing: 0; line-height: 1.25;
}
.lead {
    font-size: clamp(17px, 2.4vw, 24px);
    font-weight: 400; line-height: 1.7; color: var(--ink-2);
}
.page-head { padding-top: 160px; padding-bottom: 60px; text-align: center; }

/* Hero */
.hero {
    min-height: auto;
    margin-top: 90px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    text-align: center;
}
.hero .lead {
    max-width: 42em;
    margin-top: clamp(24px, 4vh, 48px);
    font-size: clamp(15px, 1.6vw, 19px);
    color: #444444;
}
.hero .hero-mission {
    margin-top: clamp(12px, 2vh, 20px);
    font-size: clamp(14px, 1.4vw, 17px);
    color: #777777;
}
.hero h1 {
    font-size: clamp(30px, 5.5vw, 64px);
    font-weight: 500; letter-spacing: 0.02em; line-height: 1.2;
    text-transform: uppercase; max-width: 20em; margin: 0 auto;
    color: var(--ink);
}

/* NEWS */
.news .card {
    display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
    background: var(--card); padding: 50px; border: 1px solid var(--line);
}
.news .thumb { aspect-ratio: 16/9; background: var(--thumb); overflow: hidden; }
.news .thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; }

/* 单条资讯横版卡片（左图右文）——已随资讯入口移除，保留以备复用 */
.news h3 { font-size: 30px; font-weight: 400; margin-bottom: 10px; }
.news .readmore { display: inline-block; margin-top: 22px; font-size: 12px; letter-spacing: 2px; text-transform: uppercase; border-bottom: 1px solid var(--ink); padding-bottom: 3px; }

/* 分类卡片网格 */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.tile { border: 1px solid var(--line); background: var(--card); }
.tile .thumb { aspect-ratio: 16/9; background: var(--thumb); overflow: hidden; }
.tile .thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; }
.tile .body { padding: 28px 30px; display: flex; justify-content: space-between; align-items: center; }
.tile h3 { font-size: 22px; font-weight: 500; letter-spacing: 0.5px; }
.tile .view { font-size: 13px; letter-spacing: 1px; border-bottom: 1px solid var(--ink); padding-bottom: 3px; }

/* 建造施工页：卡片配图竖版 */
.cards-tall .tile .thumb { aspect-ratio: 3/4; }

/* 关于 */
.about { background: var(--bg); }
.about .heroimg { position: relative; height: 0; padding-top: 56.25%; background: var(--thumb); margin: 40px 0; overflow: hidden; cursor: pointer; }
.about .heroimg video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }

/* CTA 按钮 */
.cta-btn {
    display: inline-block;
    margin-top: 30px;
    padding: 14px 34px;
    background: var(--brand);
    color: #ffffff;
    font-size: 14px; letter-spacing: 1px; font-weight: 600;
    border: 1px solid var(--brand);
    border-radius: 2px;
    transition: all 0.25s ease;
    cursor: pointer;
}
.cta-btn:hover { background: #ffffff; color: var(--brand); }
.cta-btn.ghost { background: transparent; color: var(--brand); }
.cta-btn.ghost:hover { background: var(--brand); color: #ffffff; }

/* 信任数字墙 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center; }
.stat .num { font-size: clamp(30px, 4vw, 46px); font-weight: 500; color: var(--brand); letter-spacing: 0.5px; }
.stat .label { font-size: 13px; color: var(--muted); margin-top: 6px; letter-spacing: 0.5px; }
.stat .hint { font-size: 11px; color: #9aa1aa; margin-top: 2px; }

/* 案例卡片（带成果数据） */
.case { border: 1px solid var(--line); background: var(--card); display: flex; flex-direction: column; }
.case .thumb { aspect-ratio: 16/10; background: var(--thumb); overflow: hidden; }
.case .thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; }
.case .body { padding: 22px 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.case h3 { font-size: 19px; font-weight: 500; letter-spacing: 0.5px; }
.case .loc { font-size: 12px; color: var(--muted); letter-spacing: 0.5px; }
.case .meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.case .meta span { font-size: 12px; color: var(--brand-2); background: #eef5f1; padding: 4px 10px; border-radius: 3px; letter-spacing: 1px; }
.case .view { margin-top: auto; font-size: 13px; letter-spacing: 1px; border-bottom: 1px solid var(--ink); padding-bottom: 3px; align-self: flex-start; }
.case .coming { color: #aaaaaa; font-size: 12px; letter-spacing: 1px; margin-top: 4px; }

/* 客户 / 背书 logo 墙 */
.logos { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; margin-top: 30px; }
.logo-pill { padding: 12px 22px; border: 1px solid var(--line); background: var(--card); color: #777777; font-size: 13px; letter-spacing: 2px; border-radius: 3px; }
.logo-pill.pending { border-style: dashed; color: #bbbbbb; }

/* 咨询表单 */
.contact-form { max-width: 560px; margin-top: 40px; }
.contact-form .fld { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.contact-form label { font-size: 12px; letter-spacing: 1px; color: var(--muted); }
.contact-form input, .contact-form textarea {
    font-family: inherit; font-size: 15px; color: var(--ink);
    padding: 12px 14px; border: 1px solid var(--line); border-radius: 3px;
    background: #fff; outline: none; transition: border-color 0.2s ease;
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--brand-2); }
.contact-form textarea { min-height: 110px; resize: vertical; }
.contact-form .submit-btn {
    display: inline-block; padding: 13px 36px; background: var(--brand); color: #fff;
    border: 1px solid var(--brand); border-radius: 3px; font-size: 14px; letter-spacing: 1px; font-weight: 600;
    cursor: pointer; transition: all 0.25s ease;
}
.contact-form .submit-btn:hover { background: #fff; color: var(--brand); }
.contact-form .form-note { font-size: 12px; color: #999999; margin-top: 12px; }

.stat .num span.unit { font-size: 0.55em; margin-left: 2px; color: var(--brand-2); }

/* 信任数字墙区块 */
.stats-bar { background: #fbfbfc; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

/* 转化 CTA 区块 */
.cta-band { background: var(--card); border-top: 1px solid var(--line); }
.cta-band .lead { font-size: clamp(18px, 2.4vw, 26px); }

/* 通用视频播放按钮覆盖层 */
.heroimg .playbtn {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 64px; height: 64px; border-radius: 50%;
    background: rgba(0, 0, 0, 0.55);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; z-index: 3;
    transition: opacity 0.25s ease, transform 0.25s ease;
    pointer-events: auto;
}
.heroimg .playbtn::after {
    content: "";
    display: block;
    width: 0; height: 0;
    border-style: solid;
    border-width: 12px 0 12px 20px;
    border-color: transparent transparent transparent #ffffff;
    margin-left: 5px;
}
.heroimg .playbtn:hover { background: rgba(0, 0, 0, 0.7); transform: translate(-50%, -50%) scale(1.08); }
.heroimg .playbtn.is-hidden { opacity: 0; pointer-events: none; }

/* 联系 */
.contact .offices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 50px; }
.office h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; }
.office p { font-size: 14px; color: var(--muted); }
.office a { color: var(--ink); text-decoration: underline; }
.join { margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--line); }
.join .note { font-size: 13px; color: #777777; font-style: italic; }

/* 列表页条目 */
.list-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 40px; }
.list-item .thumb { aspect-ratio: 16/9; background: var(--thumb); }
.list-item .thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; }
.list-item .thumb img.tall { object-fit: contain; background: #fff; }
.list-item h3 { font-size: 18px; font-weight: 400; margin-top: 16px; letter-spacing: 1px; }
.list-item p { font-size: 13px; color: #777777; margin-top: 6px; }

/* 资讯详情页头图 */
.article-heroimg { max-width: 860px; margin: 0 auto 20px; }
.article-heroimg img { width: 100%; height: auto; display: block; border-radius: 4px; object-fit: cover; }

/* 案例图片：裁掉底部水印（手机拍摄水印在左下角底部） */
.case-img { width: 100%; height: 0; padding-bottom: 72%; position: relative; overflow: hidden; border-radius: 4px; background: #f3f4f5; }
.case-img img { position: absolute; top: 0; left: 0; width: 100%; height: 118%; object-fit: cover; object-position: center top; display: block; }
.article-heroimg .case-img { max-width: none; margin: 0; }

/* 页脚 */
footer { background: var(--card); color: var(--muted); padding: 60px 40px; border-top: 1px solid var(--line); }
footer .links { display: flex; flex-wrap: wrap; gap: 14px; list-style: none; margin-bottom: 30px; }
footer .links a { font-size: 11px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); }
footer .credit { font-size: 12px; color: #8a9099; }
.footer-qr { display: flex; align-items: center; justify-content: center; gap: 20px; margin: 8px 0 28px; padding-top: 22px; border-top: 1px solid var(--line); }
.footer-qr-text { display: flex; flex-direction: column; gap: 6px; text-align: left; }
.footer-qr-text strong { font-size: 15px; color: var(--ink); font-weight: 600; letter-spacing: 0.5px; }
.footer-qr-text span { font-size: 12px; color: var(--muted); letter-spacing: 0.5px; }
.footer-qr-img { width: 92px; height: 92px; border-radius: 6px; border: 1px solid var(--line); background: #fff; padding: 4px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }

@media (max-width: 760px) {
    .stats { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .grid2, .grid3, .news .card, .contact .offices, .list-grid { grid-template-columns: 1fr; }
    .nav { height: 64px; padding: 0 18px; }
    .nav .logo { height: 44px; }
    .nav-toggle { display: flex; }
    .nav ul {
        display: none;
        position: fixed; top: 64px; left: 0; right: 0;
        flex-direction: column; align-items: stretch;
        background: #ffffff; border-bottom: 1px solid var(--line);
        box-shadow: 0 16px 32px rgba(0,0,0,0.10);
        max-height: calc(100vh - 64px); overflow-y: auto;
        height: auto; gap: 0;
        padding: 8px 0 16px;
    }
    .nav ul.is-open { display: flex; }
    .nav ul > li { width: 100%; }
    .nav ul > li > a {
        display: block; padding: 13px 24px;
        font-size: 15px; letter-spacing: 1px;
        border-bottom: 1px solid var(--card);
    }
    .nav .has-drop .drop {
        position: static; display: block; padding-top: 0; min-width: 0;
        background: transparent;
    }
    .nav .has-drop .drop ul {
        display: block; background: var(--card); border: none;
        box-shadow: none; padding: 0;
    }
    .nav .has-drop .drop ul a { padding: 10px 36px; font-size: 14px; }
    section { padding: 36px 18px; }
    .eyebrow { margin-bottom: 12px; }
    .lead { margin-bottom: 20px !important; }
    .hero { min-height: auto; margin-top: 90px; }
    .hero-carousel { min-height: 0; }
    .hero-carousel .slide { position: relative; min-height: 42vh; }
    .hero-carousel .slide.is-active { position: relative; }
    .hero-carousel .slide-title { font-size: clamp(24px, 6.4vw, 32px); }
    .hero-carousel .slide-sub { font-size: 14px; margin-top: 10px; }
    .tile .body { padding: 18px 20px; }
    .grid2, .grid3, .list-grid { gap: 18px; }
    .about .heroimg { margin: 24px 0; }
    .case-gallery { grid-template-columns: 1fr !important; gap: 18px !important; }
    .contact .offices { margin-top: 24px; gap: 24px; }
    .contact-form { max-width: none; }
    .contact-form .submit-btn { width: 100%; }
    .footer-qr { flex-direction: column; gap: 14px; text-align: center; }
    .footer-qr-text { text-align: center; align-items: center; }
    .footer-qr-img { width: 104px; height: 104px; }
    footer { padding: 40px 18px; }
}

/* 首页文字轮播 */
.hero-carousel { position: relative; overflow: hidden; aspect-ratio: 16/9; }
@media (max-width: 760px) { .hero-carousel { aspect-ratio: auto; } }
.hero-carousel .slide {
    position: absolute; inset: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    text-align: center; padding: 0 34px;
    opacity: 0;
    transition: opacity 2s ease-in-out;
    background-size: cover; background-position: center; background-repeat: no-repeat;
}
.hero-carousel .slide::before {
    content: ""; position: absolute; inset: 0;
    background: transparent; z-index: 0;
}
.hero-carousel .slide > * { position: relative; z-index: 1; }
.hero-carousel .slide.is-active { opacity: 1; }
.hero-carousel .slide-title {
    display: block; width: 100%;
    font-size: clamp(30px, 5vw, 58px); font-weight: 500; letter-spacing: 0.01em; line-height: 1.2;
    color: #1f2530; max-width: none;
    background: linear-gradient(to right, transparent 0%, rgba(255,255,255,0.65) 30%, rgba(255,255,255,0.65) 70%, transparent 100%);
    padding: 10px 22px;
}
.hero-carousel .slide-sub {
    display: block; width: 100%;
    font-size: clamp(15px, 1.7vw, 20px); font-weight: 400; letter-spacing: 0.5px;
    color: #2a3140; margin-top: 16px; max-width: none; line-height: 1.7;
    background: linear-gradient(to right, transparent 0%, rgba(255,255,255,0.65) 30%, rgba(255,255,255,0.65) 70%, transparent 100%);
    padding: 7px 18px;
}
.hero-dots {
    position: absolute; bottom: 40px; left: 0; right: 0;
    display: flex; gap: 10px; justify-content: center; z-index: 5;
}
.hero-dots span {
    width: 8px; height: 8px; border-radius: 50%; background: #d4d4d8;
    cursor: pointer; transition: all 0.3s ease;
}
.hero-dots span.is-active { background: var(--brand); width: 24px; border-radius: 4px; }