/* ===== 秉弘设计 v6 — Gensler 深度还原 ===== */
/*
源的三句话：
1. "认真对待每一个元素，不会让它傻傻待着，除了描述性文字"
2. "从全局看，再看局部"  
3. "大胆一点，可以颠覆性调整"

Gensler核心发现：
- 悬停时子元素依次出现（nth-child 级联延时）
- 标题的渐变遮罩滑开，露出干净标题
- 图片用 cubic-bezier(.32,.94,.6,1) 弹性过场
- 内容缩放 5%（custom-grid hover zoom）
- 副标题 opacity 0→1 + translateY 32px→0，用不同 curve
- 箭头图标 hover 时从右下弹出
- 图片变透明露出底层文字
*/

:root {
    --brand: #1a6b4f;
    --brand-dark: #0f4d37;
    --brand-darker: #082b1d;
    --brand-light: #eaf5ef;
    --text: rgba(0,0,0,.87);
    --text2: rgba(0,0,0,.54);
    --text3: rgba(0,0,0,.38);
    --bg: #fafaf8;
    --bg-card: #ffffff;
    --bg2: #f2f2ee;
    --border: #e0e0dc;
    --nav-h: 64px;
    --max-w: 1200px;
    --font: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    /* Gensler easing curves */
    --ease-bounce: cubic-bezier(.32, .94, .6, 1);
    --ease-smooth: cubic-bezier(.165, .84, .44, 1);
    --ease-snap: cubic-bezier(.4, 0, .2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 2;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===== Header ===== */
.site-header {
    position: fixed; top: 0; left: 0; right: 0;
    z-index: 1000; height: var(--nav-h);
    transition: height .3s var(--ease-smooth), background .3s ease, box-shadow .3s ease;
}
.site-header.scrolled {
    height: 56px;
    background: rgba(250,250,248,.97);
    backdrop-filter: blur(12px);
    box-shadow: inset 0 -1px 0 var(--border);
}
.header-inner {
    max-width: var(--max-w); margin: 0 auto;
    height: 100%; padding: 0 32px;
    display: flex; align-items: center; justify-content: space-between;
}
.site-logo { display: flex; align-items: center; gap: 10px; }
.site-logo img { height: 24px; border-radius: 2px; opacity: .9; transition: opacity .3s ease; }
.site-logo:hover img { opacity: 1; }
.site-logo span {
    font-size: 15px; font-weight: 600;
    letter-spacing: 1.5px;
    color: var(--bg);
    transition: color .3s ease;
}
.site-header.scrolled .site-logo span { color: var(--text); }

.header-nav { display: flex; align-items: center; gap: 0; }
.header-nav a {
    font-size: 12px; font-weight: 500;
    letter-spacing: 1.2px;
    color: rgba(255,255,255,.7);
    padding: 6px 14px;
    position: relative;
    transition: color .2s var(--ease-snap);
}
/* Underline slides from center */
.header-nav a::after {
    content: '';
    position: absolute; bottom: 2px;
    left: 50%; right: 50%;
    height: 1px; background: rgba(255,255,255,.6);
    transition: left .25s var(--ease-smooth), right .25s var(--ease-smooth);
}
.header-nav a:hover { color: #fff; }
.header-nav a:hover::after { left: 14px; right: 14px; }
.header-nav a.active { color: #fff; }
.header-nav a.active::after { left: 14px; right: 14px; background: var(--brand); }

.lang-switch {
    margin-left: 10px; padding-left: 14px;
    border-left: 1px solid rgba(255,255,255,.2);
}
.lang-switch a {
    font-size: 10px !important; font-weight: 600 !important;
    letter-spacing: 1.5px !important;
    text-transform: uppercase;
    padding: 6px 10px !important;
}
.lang-switch a::after { display: none !important; }
.lang-switch a:hover { opacity: .7; }

/* scrolled state */
.site-header.scrolled .header-nav a { color: var(--text2); }
.site-header.scrolled .header-nav a:hover { color: var(--brand); }
.site-header.scrolled .header-nav a::after { background: var(--brand); }
.site-header.scrolled .header-nav a.active { color: var(--brand); }
.site-header.scrolled .lang-switch { border-left-color: var(--border); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; padding: 4px; }
.nav-toggle span { width: 22px; height: 1.5px; background: var(--bg); transition: all .3s ease; }
.site-header.scrolled .nav-toggle span { background: var(--text); }

/* ===== Hero ===== */
.hero {
    height: 100vh; min-height: 620px;
    position: relative; overflow: hidden;
    display: flex; align-items: center; justify-content: center;
}
.hero-layers { position: absolute; inset: 0; }
.hero-layer {
    position: absolute; inset: 0;
    background-size: cover; background-position: center 25%;
    opacity: 0;
    transition: opacity 1.2s var(--ease-smooth);
}
.hero-layer.active { opacity: 1; }
.hero-layer:nth-child(1) { background-image: url('../images/about-hero.jpg'); }
.hero-layer:nth-child(2) { background-image: url('../images/project-01.jpg'); }
.hero-layer:nth-child(3) { background-image: url('../images/project-03.jpg'); }
.hero-layer::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(160deg, rgba(15,65,42,.93) 0%, rgba(26,107,79,.8) 100%);
}
.hero-text {
    position: relative; z-index: 3;
    text-align: center; padding: 0 32px;
}
.hero-text h1 {
    font-size: 56px; font-weight: 200;
    color: #fff; letter-spacing: 6px; line-height: 1.15;
    margin-bottom: 16px;
    /* Fade in on load - handled by main.js */
}
.hero-text p {
    font-size: 13px; color: rgba(255,255,255,.35);
    letter-spacing: 4px; text-transform: uppercase;
    margin-bottom: 40px;
}
.hero-actions { display: flex; gap: 28px; justify-content: center; }

/* ===== Gensler Button v3 — with center-out underline ===== */
.gensler-btn {
    display: inline-flex;
    background: transparent; border: none;
    color: rgba(255,255,255,.6);
    font-size: 12px; font-weight: 500; font-family: var(--font);
    letter-spacing: 2.5px;
    padding: 6px 0;
    cursor: pointer; text-decoration: none;
    position: relative;
    text-transform: uppercase;
    transition: color .2s var(--ease-snap);
}
.gensler-btn::after {
    content: '';
    position: absolute; bottom: 0;
    left: 50%; right: 50%;
    height: 1px;
    background: rgba(255,255,255,.2);
    transition: left .3s var(--ease-smooth), right .3s var(--ease-smooth);
}
.gensler-btn:hover { color: #fff; }
.gensler-btn:hover::after { left: 0; right: 0; }

.sec .gensler-btn { color: var(--text2); }
.sec .gensler-btn::after { background: var(--border); }
.sec .gensler-btn:hover { color: var(--brand); }
.sec .gensler-btn:hover::after { background: var(--brand); }

/* ===== Section ===== */
.sec {
    padding: 100px 0;
    position: relative;
    /* Each section has a subtle transition between bg changes */
}
.sec-gray { background: var(--bg2); }
.sec-divider { 
    /* Visual transition between sections */
    margin-top: -1px;
}
.sec-head {
    text-align: center; margin-bottom: 60px; padding: 0 32px;
}
.sec-head .label {
    font-size: 11px; font-weight: 500; color: var(--brand);
    letter-spacing: 4px; text-transform: uppercase;
    display: block; margin-bottom: 12px;
}
.sec-head h2 {
    font-size: 30px; font-weight: 300;
    letter-spacing: 4px; line-height: 1.3; color: var(--text);
}
.sec-body { max-width: var(--max-w); margin: 0 auto; padding: 0 32px; }

/* ===== Stats — individual counters with text separator ===== */
.stats-row {
    max-width: var(--max-w); margin: 0 auto;
    display: flex;
    position: relative;
}
.stat-card {
    flex: 1; text-align: center;
    padding: 48px 24px;
    position: relative;
    transition: background .25s var(--ease-smooth);
}
.stat-card + .stat-card { border-left: 1px solid var(--border); }
.stat-card:hover { background: var(--brand-light); }
.stat-num {
    font-size: 42px; font-weight: 200; color: var(--brand);
    line-height: 1; margin-bottom: 6px;
    transition: transform .3s var(--ease-bounce);
}
.stat-card:hover .stat-num { transform: scale(1.05); }
.stat-label {
    font-size: 11px; color: var(--text3); letter-spacing: 2px;
    text-transform: uppercase;
    transition: color .25s ease;
}
.stat-card:hover .stat-label { color: var(--brand); }

/* ===== Featured Projects — with stagger cascade ===== */
.project-grid {
    max-width: var(--max-w); margin: 0 auto; padding: 0 32px;
    display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
}
.project-card {
    position: relative; overflow: hidden; display: block;
    border-radius: 2px; cursor: pointer;
    background: var(--bg-card);
}
.project-card img {
    width: 100%; height: 320px; object-fit: cover;
    transition: transform .4s var(--ease-bounce);
}
.project-card:hover img { transform: scale(1.05); }
.project-card .overlay {
    position: absolute; bottom: 0; left: 0; right: 0;
    padding: 40px 24px 20px;
    background: linear-gradient(transparent, rgba(0,0,0,.6));
    color: #fff;
}
.project-card .overlay h3 {
    font-size: 16px; font-weight: 500; letter-spacing: 1px;
    margin-bottom: 2px;
    transition: transform .3s var(--ease-smooth), opacity .3s ease;
}
.project-card .overlay .meta {
    font-size: 12px; color: rgba(255,255,255,.5);
    letter-spacing: .5px;
    transition: all .2s var(--ease-smooth);
    transition-delay: 0s;
}
.project-card .overlay .detail {
    font-size: 12px; color: rgba(255,255,255,.3);
    opacity: 0;
    transition: all .25s var(--ease-smooth);
    transition-delay: 0s;
}
/* Gensler cascade: each child appears one after another */
.project-card:hover .overlay .meta {
    transition-delay: .08s;
}
.project-card:hover .overlay .detail {
    opacity: 1;
    transition-delay: .16s;
}

.sec-more { text-align: center; margin-top: 48px; }

/* ===== Service cards — with staggered + icon animation ===== */
.service-row {
    max-width: var(--max-w); margin: 0 auto;
    display: flex;
}
.service-card {
    flex: 1; text-align: center;
    padding: 60px 28px;
    background: var(--bg-card);
    transition: background .25s var(--ease-smooth);
    position: relative;
}
.service-card + .service-card { border-left: 1px solid var(--border); }
.service-card:hover { background: var(--brand-light); }
.service-card .s-icon {
    width: 36px; height: 36px; margin: 0 auto 16px;
    color: var(--brand);
    transition: transform .35s var(--ease-bounce);
}
.service-card:hover .s-icon { transform: scale(1.15) rotate(-3deg); }
.service-card .s-icon svg { width: 100%; height: 100%; }
.service-card h3 {
    font-size: 15px; font-weight: 600; margin-bottom: 8px; letter-spacing: 1px;
    transition: color .2s ease;
}
.service-card:hover h3 { color: var(--brand); }
.service-card p {
    font-size: 13px; color: var(--text2); line-height: 1.8;
    transition: color .2s ease;
    transition-delay: .05s;
}
.service-card:hover p { color: var(--text); }

/* ===== Team — photo scale + stagger contact ===== */
.team-row {
    max-width: var(--max-w); margin: 0 auto;
    display: flex;
}
.team-card {
    flex: 1; text-align: center;
    padding: 36px 16px 32px;
    background: var(--bg-card);
    transition: background .25s var(--ease-smooth);
    position: relative;
    overflow: hidden;
}
.team-card + .team-card { border-left: 1px solid var(--border); }
.team-card:hover { background: var(--brand-light); }
.team-photo {
    width: 52px; height: 52px; margin: 0 auto 14px;
    border-radius: 50%; background: var(--brand-light);
    display: flex; align-items: center; justify-content: center;
    color: var(--brand);
    transition: transform .35s var(--ease-bounce), box-shadow .35s ease;
}
.team-card:hover .team-photo {
    transform: scale(1.12);
    box-shadow: 0 4px 20px rgba(26,107,79,.15);
}
.team-photo svg { width: 24px; height: 24px; }
.team-card h3 {
    font-size: 15px; font-weight: 600; margin-bottom: 2px;
    transition: color .2s ease;
}
.team-card:hover h3 { color: var(--brand); }
.team-card .role {
    font-size: 11px; color: var(--brand); font-weight: 500; display: block;
    margin-bottom: 2px;
}
.team-card .exp { font-size: 11px; color: var(--text3); display: block; }
.team-card .team-contact {
    display: block; font-size: 11px; color: var(--brand);
    opacity: 0; transform: translateY(8px);
    transition: all .25s var(--ease-smooth);
    margin-top: 4px;
}
.team-card:hover .team-contact { opacity: 1; transform: translateY(0); }

/* ===== Contact ===== */
.contact-row {
    max-width: var(--max-w); margin: 0 auto; padding: 0 32px;
    display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
}
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.ci {
    display: flex; gap: 12px; align-items: flex-start;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    transition: all .25s var(--ease-smooth);
}
.ci:hover {
    padding-left: 8px;
    border-bottom-color: var(--brand);
}
.ci svg {
    width: 20px; height: 20px; color: var(--brand); flex-shrink: 0; margin-top: 2px;
    transition: transform .3s var(--ease-bounce);
}
.ci:hover svg { transform: scale(1.1); }
.ci h4 { font-size: 12px; font-weight: 600; margin-bottom: 2px; letter-spacing: .5px; }
.ci p { font-size: 14px; color: var(--text2); }

.contact-form { display: flex; flex-direction: column; }
.contact-form h3 { font-size: 18px; font-weight: 300; margin-bottom: 24px; letter-spacing: 2px; }
.contact-form input,
.contact-form textarea {
    width: 100%; padding: 14px 0 12px;
    border: none; border-bottom: 1px solid var(--border);
    font-size: 14px; font-family: var(--font); outline: none;
    background: transparent;
    transition: border-color .3s var(--ease-smooth), padding-left .3s ease;
}
.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--brand);
    padding-left: 8px;
}
.contact-form textarea { margin-bottom: 20px; resize: vertical; min-height: 80px; }
.contact-form .gensler-btn { align-self: flex-start; margin-top: 4px; }

/* ===== Footer ===== */
.site-footer {
    background: #1c1c1a;
    color: rgba(255,255,255,.3);
    padding: 48px 0 28px;
}
.footer-inner {
    max-width: var(--max-w); margin: 0 auto; padding: 0 32px 24px;
    display: flex; justify-content: space-between; align-items: flex-start;
    flex-wrap: wrap; gap: 24px;
    border-bottom: 1px solid rgba(255,255,255,.06);
}
.footer-inner p {
    font-size: 13px; color: rgba(255,255,255,.5);
    margin-bottom: 4px;
}
.footer-inner small { font-size: 11px; color: rgba(255,255,255,.15); }
.footer-inner nav { display: flex; gap: 20px; }
.footer-inner nav a { font-size: 12px; color: rgba(255,255,255,.25); transition: color .2s ease; }
.footer-inner nav a:hover { color: rgba(255,255,255,.5); }
.footer-copy { text-align: center; font-size: 10px; padding: 20px 32px 0; color: rgba(255,255,255,.08); letter-spacing: 1px; }

/* ===== Subpages ===== */
.page-hero {
    height: 38vh; min-height: 280px;
    position: relative; overflow: hidden;
    display: flex; align-items: center; justify-content: center;
    background: var(--brand-dark);
}
.page-hero .wall {
    position: absolute; inset: 0;
    background: linear-gradient(160deg, rgba(15,65,42,.92), rgba(26,107,79,.75));
}
.page-hero .hero-bg {
    position: absolute; inset: 0;
    background: url('../images/about-hero.jpg') center 30%/cover no-repeat;
    opacity: .08;
    transition: opacity .5s ease, transform .6s var(--ease-smooth);
}
.page-hero:hover .hero-bg {
    opacity: .12;
    transform: scale(1.02);
}
.page-hero .hero-text { position: relative; z-index: 2; text-align: center; padding: 0 32px; }
.page-hero h1 {
    font-size: 34px; font-weight: 200; color: var(--bg); letter-spacing: 6px;
    transition: letter-spacing .3s ease;
}
.page-hero:hover h1 { letter-spacing: 8px; }
.page-hero p { font-size: 12px; color: rgba(255,255,255,.3); margin-top: 12px; letter-spacing: 3px; }

.breadcrumb {
    max-width: var(--max-w); margin: 0 auto; padding: 20px 32px;
    font-size: 11px; color: var(--text3);
}
.breadcrumb a { color: var(--text2); transition: color .2s ease; }
.breadcrumb a:hover { color: var(--brand); }

.filter-bar {
    max-width: var(--max-w); margin: 0 auto 40px; padding: 0 32px;
    display: flex; gap: 8px; flex-wrap: wrap;
}
.filter-btn {
    padding: 6px 18px; font-size: 11px; font-weight: 500;
    font-family: var(--font);
    color: var(--text2); background: transparent;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all .25s var(--ease-smooth);
    letter-spacing: .5px;
}
.filter-btn:hover { border-color: var(--brand); color: var(--brand); }
.filter-btn.active { background: var(--brand); color: #fff; border-color: var(--brand); }

.project-list {
    max-width: var(--max-w); margin: 0 auto; padding: 0 32px;
    display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
.project-list .project-card { border-radius: 2px; }

.service-full {
    max-width: var(--max-w); margin: 0 auto; padding: 0 32px;
    display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
.service-full-card {
    padding: 48px;
    background: var(--bg-card);
    transition: all .3s var(--ease-smooth);
}
.service-full-card:hover {
    background: var(--brand-light);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,.06);
}
.service-full-card .s-icon {
    margin-bottom: 16px; color: var(--brand);
    transition: transform .35s var(--ease-bounce);
}
.service-full-card:hover .s-icon { transform: scale(1.1) rotate(-3deg); }
.service-full-card h3 {
    font-size: 18px; font-weight: 400; letter-spacing: 2px; margin-bottom: 14px;
    transition: color .2s ease;
}
.service-full-card:hover h3 { color: var(--brand); }
.service-full-card p { font-size: 13px; color: var(--text2); line-height: 2; }

.about-section {
    max-width: var(--max-w); margin: 0 auto; padding: 0 32px;
}
.about-section + .about-section { margin-top: 56px; padding-top: 56px; border-top: 1px solid var(--border); }
.about-section h2 { font-size: 22px; font-weight: 300; letter-spacing: 3px; margin-bottom: 28px; }
.about-section p { font-size: 14px; color: var(--text2); line-height: 2; margin-bottom: 12px; }
.about-section .team-row { max-width: none; }

.about-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.about-grid img {
    width: 100%; height: 360px; object-fit: cover; border-radius: 2px;
    transition: transform .4s var(--ease-bounce);
}
.about-grid:hover img { transform: scale(1.02); }

.cert-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px; margin-top: 24px;
}
.cert-item {
    aspect-ratio: 3/4;
    background: var(--bg-card);
    display: flex; align-items: center; justify-content: center;
    font-size: 11px; color: var(--text3);
    border: 1px solid var(--border);
    transition: all .25s var(--ease-smooth);
    overflow: hidden;
}
.cert-item:hover {
    border-color: var(--brand);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(26,107,79,.1);
}
.cert-item img { width: 100%; height: 100%; object-fit: cover; }

.contact-page-row {
    display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
    max-width: var(--max-w); margin: 0 auto; padding: 0 32px;
}

/* ===== Scroll Animation ===== */
.fade-in {
    opacity: 0; transform: translateY(24px);
    transition: opacity .5s var(--ease-smooth), transform .5s var(--ease-smooth);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-delay-1 { transition-delay: .1s; }
.fade-in-delay-2 { transition-delay: .2s; }
.fade-in-delay-3 { transition-delay: .3s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .service-full { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 36px; letter-spacing: 4px; }
    .sec { padding: 72px 0; }
    .sec-head h2 { font-size: 24px; letter-spacing: 3px; }
    .stats-row { flex-direction: column; }
    .stat-card + .stat-card { border-left: none; border-top: 1px solid var(--border); }
    .service-row { flex-direction: column; }
    .service-card + .service-card { border-left: none; border-top: 1px solid var(--border); }
    .team-row { flex-wrap: wrap; }
    .team-card { flex: 1 1 50%; }
    .team-card:nth-child(2) { border-left: 1px solid var(--border); }
    .team-card:nth-child(3) { border-left: none; border-top: 1px solid var(--border); }
    .team-card:nth-child(4) { border-left: 1px solid var(--border); border-top: 1px solid var(--border); }
    .team-card:nth-child(5) { border-left: none; border-top: 1px solid var(--border); }
    .project-grid { grid-template-columns: 1fr; gap: 16px; }
    .project-list { grid-template-columns: 1fr; gap: 16px; }
    .page-hero h1 { font-size: 26px; }
    .page-hero:hover h1 { letter-spacing: 6px; }
    .about-grid { grid-template-columns: 1fr; gap: 32px; }
    .contact-row { grid-template-columns: 1fr; gap: 40px; }
    .contact-page-row { grid-template-columns: 1fr; gap: 32px; }
    .service-full { grid-template-columns: 1fr; }
    .header-nav {
        position: fixed; top: var(--nav-h); left: 0; right: 0;
        background: rgba(250,250,248,.97);
        flex-direction: column; align-items: flex-start;
        padding: 24px; gap: 16px;
        transform: translateY(-120%);
        transition: transform .3s ease;
    }
    .header-nav.active { transform: translateY(0); }
    .header-nav a { color: var(--text) !important; font-size: 14px !important; }
    .header-nav a::after { display: none; }
    .header-nav a.active { color: var(--brand) !important; }
    .lang-switch { border-left: none !important; margin-left: 0 !important; padding-left: 0 !important; }
    .nav-toggle { display: flex; }
    .footer-inner nav { display: flex; flex-wrap: wrap; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 28px; }
    .hero-actions { flex-direction: column; gap: 16px; align-items: center; }
    .header-inner { padding: 0 20px; }
    .sec-body { padding: 0 20px; }
    .sec-head { padding: 0 20px; }
    .team-card { flex: 1 1 100%; }
    .team-card + .team-card { border-left: none !important; border-top: 1px solid var(--border); }
    .service-full-card { padding: 32px 24px; }
    .contact-page-row { padding: 0 20px; }
    .project-list { padding: 0 20px; }
    .footer-inner { padding: 0 20px; flex-direction: column; }
}