/* ============================================================
   GBAHAI 官网样式 —— 国际化 / 图片主导 / 品牌色体系
   品牌色: 亮青蓝 #00BADF  深紫 #42074E  近黑 #0A1019  亮青 #4FD8F0
   ============================================================ */
:root{
  --cyan:#00BADF; --cyan-l:#4FD8F0; --purple:#42074E; --purple-l:#6d1f7e;
  --dark:#0A1019; --ink:#0E1622; --paper:#F6F9FC; --white:#fff;
  --muted:#62728a; --line:rgba(14,22,34,.10); --green:#1FA971;
  --shadow:0 18px 50px rgba(10,16,25,.12);
  --radius:18px;
  --max:1200px;
  --font:"Inter","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
.sec-title{font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:-.02em;color:var(--ink)}
.sec-title.center{text-align:center;margin-bottom:14px}
.sec-intro{text-align:center;max-width:760px;margin:0 auto 48px;color:var(--muted);font-size:17px}
.section{padding:clamp(64px,9vw,120px) 0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 30px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;transition:.25s;border:1.5px solid transparent;font-family:inherit}
.btn-primary{background:linear-gradient(120deg,var(--cyan),var(--purple));color:#fff;box-shadow:0 12px 30px rgba(0,186,223,.35)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(66,7,78,.4)}
.btn-ghost{border-color:rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12);transform:translateY(-3px)}

/* ===================== NAV ===================== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s}
.nav.scrolled{background:rgba(255,255,255,.9);backdrop-filter:blur(14px);box-shadow:0 6px 24px rgba(10,16,25,.08)}
.nav-inner{max-width:var(--max);margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:11px;color:var(--white);transition:.3s}
.nav.scrolled .brand{color:var(--ink)}
.emblem{height:40px;width:auto;max-width:260px;flex:0 0 auto;object-fit:contain;background:#fff;border-radius:9px;padding:5px 9px;box-shadow:0 2px 8px rgba(0,0,0,.10)}
.brand-text{font-weight:700;font-size:16px;letter-spacing:-.01em;white-space:nowrap}
.menu{display:flex;gap:26px}
.menu a{font-size:15px;font-weight:500;color:rgba(255,255,255,.92);transition:.2s;position:relative}
.nav.scrolled .menu a{color:var(--ink)}
.menu a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--cyan);transition:.25s}
.menu a:hover::after{width:100%}
.nav-right{display:flex;align-items:center;gap:14px}
.lang{display:flex;background:rgba(255,255,255,.16);border-radius:999px;padding:3px}
.nav.scrolled .lang{background:rgba(10,16,25,.06)}
.lang-btn{border:0;background:transparent;color:#fff;font-weight:600;font-size:13px;padding:6px 12px;border-radius:999px;cursor:pointer;font-family:inherit;transition:.2s}
.nav.scrolled .lang-btn{color:var(--ink)}
.lang-btn.active{background:#fff;color:var(--purple)}
.nav.scrolled .lang-btn.active{background:var(--purple);color:#fff}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.hamburger span{width:24px;height:2px;background:#fff;transition:.3s}
.nav.scrolled .hamburger span{background:var(--ink)}

/* ===================== HERO ===================== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.05)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(100deg,rgba(10,16,25,.88) 0%,rgba(10,16,25,.6) 45%,rgba(66,7,78,.45) 100%)}
.hero-content{position:relative;z-index:2;max-width:var(--max);margin:0 auto;padding:120px 24px 80px;width:100%}
.hero-eyebrow{display:inline-block;font-size:14px;letter-spacing:.18em;text-transform:uppercase;color:var(--cyan-l);font-weight:600;margin-bottom:18px;padding:7px 16px;border:1px solid rgba(79,216,240,.4);border-radius:999px;backdrop-filter:blur(4px)}
.hero-title{font-size:clamp(38px,6.5vw,76px);font-weight:800;line-height:1.05;letter-spacing:-.02em;margin-bottom:14px}
.hero-sub{font-size:clamp(15px,2vw,22px);font-weight:400;color:rgba(255,255,255,.82);margin-bottom:22px;letter-spacing:.01em}
.hero-desc{font-size:clamp(16px,1.6vw,19px);max-width:620px;color:rgba(255,255,255,.86);margin-bottom:36px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.scroll-hint{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);z-index:2}
.scroll-hint span{display:block;width:26px;height:42px;border:2px solid rgba(255,255,255,.5);border-radius:999px;position:relative}
.scroll-hint span::after{content:"";position:absolute;top:8px;left:50%;transform:translateX(-50%);width:4px;height:8px;border-radius:2px;background:#fff;animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{opacity:0;top:8px}40%{opacity:1}80%{opacity:0;top:22px}100%{opacity:0}}

/* ===================== STATS ===================== */
.stats{background:linear-gradient(120deg,var(--cyan),var(--purple));color:#fff;padding:54px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{font-size:clamp(30px,4vw,46px);font-weight:800;letter-spacing:-.02em}
.stat-label{font-size:14px;opacity:.92;margin-top:6px;line-height:1.5}

/* ===================== ABOUT ===================== */
.about{background:var(--white)}
.about-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:60px;align-items:center}
.about-media{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.about-media img{width:100%;height:520px;object-fit:cover}
.about-media-badge{position:absolute;left:18px;bottom:18px;background:rgba(10,16,25,.7);color:#fff;padding:9px 16px;border-radius:999px;font-size:13px;font-weight:600;backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.2)}
.about-text .sec-title{margin-bottom:22px;text-align:left}
.about-text p{color:var(--muted);margin-bottom:16px;font-size:16.5px}

/* ===================== VISION ===================== */
.vision{background:var(--paper)}
.vision-wrap{display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:stretch}
.mission h3{font-size:22px;margin-bottom:22px;font-weight:700}
.mission-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.mission-card{background:#fff;border-radius:14px;padding:26px 20px;box-shadow:0 10px 30px rgba(10,16,25,.06);border:1px solid var(--line);transition:.25s}
.mission-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.mission-card .mc-i{width:46px;height:46px;border-radius:12px;background:linear-gradient(120deg,var(--cyan),var(--purple));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:20px;margin-bottom:14px}
.mission-card h4{font-size:17px;margin-bottom:8px}
.mission-card p{font-size:14px;color:var(--muted)}
.vision-statement{background:linear-gradient(150deg,var(--purple),var(--dark));color:#fff;border-radius:var(--radius);padding:42px 36px;display:flex;flex-direction:column;justify-content:center}
.vs-label{font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-l);font-weight:600;margin-bottom:14px}
.vision-statement p{font-size:clamp(19px,2.2vw,26px);font-weight:600;line-height:1.5}

/* ===================== RESEARCH ===================== */
.research{background:var(--white)}
.research-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.r-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 30px rgba(10,16,25,.07);border:1px solid var(--line);transition:.3s;display:flex;flex-direction:column}
.r-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.r-card .r-img{height:200px;overflow:hidden}
.r-card .r-img img{width:100%;height:100%;object-fit:cover;transition:.4s}
.r-card:hover .r-img img{transform:scale(1.07)}
.r-card .r-body{padding:24px 22px 28px}
.r-card .r-no{font-size:13px;font-weight:700;color:var(--cyan);letter-spacing:.1em}
.r-card h3{font-size:19px;margin:8px 0 10px;font-weight:700}
.r-card p{font-size:14.5px;color:var(--muted)}

/* ===================== EXPERTS ===================== */
.experts{background:var(--paper)}
.experts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.ex-card{background:#fff;border-radius:var(--radius);padding:34px 28px;box-shadow:0 10px 30px rgba(10,16,25,.06);border:1px solid var(--line);transition:.25s;text-align:center}
.ex-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.ex-ava{width:74px;height:74px;border-radius:50%;margin:0 auto 18px;background:linear-gradient(120deg,var(--cyan),var(--purple));display:flex;align-items:center;justify-content:center;color:#fff;font-size:26px;font-weight:700}
.ex-card h3{font-size:19px;margin-bottom:10px}
.ex-card p{font-size:14.5px;color:var(--muted)}
.experts-note{text-align:center;margin-top:30px;color:var(--muted);font-size:14px}

/* ===================== OUTPUT ===================== */
.output{background:var(--white)}
.output-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.out-card{background:linear-gradient(160deg,#fff,#F2F7FB);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;position:relative;transition:.25s;overflow:hidden}
.out-card::before{content:"";position:absolute;top:0;left:0;width:100%;height:5px;background:linear-gradient(90deg,var(--cyan),var(--purple))}
.out-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.out-tag{font-size:12px;font-weight:700;color:var(--purple);letter-spacing:.08em;text-transform:uppercase}
.out-card h3{font-size:18px;margin:12px 0 12px;line-height:1.45;font-weight:700}
.out-card p{font-size:14.5px;color:var(--muted)}

/* ===================== ECOSYSTEM ===================== */
.ecosystem{background:linear-gradient(180deg,var(--paper),#fff)}
.eco-block{margin-bottom:42px}
.eco-label{font-size:15px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin-bottom:18px}
.brand-chips{display:flex;flex-wrap:wrap;gap:14px}
.chip{padding:14px 28px;border-radius:999px;background:#fff;border:1.5px solid var(--line);font-weight:600;font-size:16px;color:var(--ink);transition:.25s;box-shadow:0 6px 18px rgba(10,16,25,.05)}
.chip:hover{border-color:var(--cyan);color:var(--purple);transform:translateY(-3px)}
.eco-make{font-size:17px;color:var(--muted);background:#fff;border-left:4px solid var(--purple);padding:20px 24px;border-radius:12px;max-width:820px}

/* ===================== NEWS ===================== */
.news{background:var(--white)}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.news-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;display:flex;flex-direction:column;transition:.25s;position:relative}
.news-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--cyan)}
.news-date{font-size:12px;color:var(--cyan);font-weight:700;letter-spacing:.06em}
.news-card h3{font-size:18px;margin:12px 0 12px;line-height:1.45;font-weight:700}
.news-card p{font-size:14.5px;color:var(--muted);flex:1}
.news-src{margin-top:16px;font-size:12.5px;color:var(--muted);border-top:1px solid var(--line);padding-top:14px}

/* ===================== CONTACT ===================== */
.contact{background:var(--paper)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.contact-intro{color:var(--muted);margin:14px 0 24px;font-size:16.5px}
.contact-list{list-style:none;margin-bottom:22px}
.contact-list li{display:flex;flex-direction:column;gap:4px;padding:14px 0;border-bottom:1px solid var(--line)}
.ci-label{font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan)}
.contact-list a{color:var(--purple);font-weight:600}
.contact-gba{font-size:15px;font-weight:600;color:var(--ink);margin-bottom:24px}
.contact-map .map-card{background:linear-gradient(150deg,rgba(10,16,25,.85),rgba(66,7,78,.8)),url('../img/gbahai-brand.png') center/cover no-repeat;color:#fff;border-radius:var(--radius);padding:48px 36px;box-shadow:var(--shadow);min-height:260px;display:flex;flex-direction:column;justify-content:center;gap:14px}
.map-pin{font-size:34px}
.map-card p{font-size:17px;line-height:1.6}
.map-tag{display:inline-block;align-self:flex-start;font-size:13px;background:rgba(255,255,255,.15);padding:7px 16px;border-radius:999px;font-weight:600}

/* ===================== WECHAT 服务号 ===================== */
.wechat{background:var(--paper)}
.wechat-grid{display:grid;grid-template-columns:.92fr 1.08fr;gap:44px;align-items:start}
.wechat-card{background:#fff;border-radius:var(--radius);padding:36px 30px;box-shadow:var(--shadow);text-align:center;border:1px solid var(--line)}
.wechat-qr{width:216px;height:216px;object-fit:contain;margin:0 auto 18px;border-radius:12px;background:#fff;border:1px solid var(--line)}
.wechat-follow-title{font-size:19px;font-weight:700;margin-bottom:8px}
.wechat-follow-desc{color:var(--muted);font-size:14.5px;margin-bottom:20px}
.wechat-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.wechat-id{font-size:14px;color:var(--purple);font-weight:600;margin:0}
.wechat-articles{display:flex;flex-direction:column;gap:16px}
.wechat-art-head{font-size:18px;font-weight:700;margin:4px 0 18px;color:var(--ink)}
.wechat-art{display:block;background:#fff;border-radius:14px;padding:20px 22px;box-shadow:0 8px 24px rgba(10,16,25,.05);border:1px solid var(--line);transition:.25s;text-decoration:none;color:inherit}
.wechat-art:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.wechat-art h4{font-size:16.5px;margin-bottom:8px;line-height:1.45}
.wechat-art p{font-size:14px;color:var(--muted);margin-bottom:12px;line-height:1.6}
.wechat-art .wa-meta{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--cyan)}
.wechat-art .wa-read{font-weight:600;color:var(--purple)}
.btn-outline{border:1.5px solid var(--cyan);color:var(--purple);background:transparent}
.btn-outline:hover{background:rgba(0,186,223,.08)}

/* ===================== FOOTER ===================== */
.footer{background:var(--dark);color:rgba(255,255,255,.75);padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px}
.footer .brand{color:#fff;margin-bottom:18px}
.footer-about{font-size:14.5px;max-width:420px;line-height:1.7}
.footer-links h4,.footer-contact h4{color:#fff;font-size:15px;margin-bottom:16px;font-weight:700}
.footer-links a{display:block;margin-bottom:10px;font-size:14.5px;transition:.2s}
.footer-links a:hover{color:var(--cyan-l)}
.footer-contact p{font-size:14.5px;margin-bottom:8px}
.footer-contact a{color:var(--cyan-l)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:rgba(255,255,255,.55)}

/* ===================== REVEAL ANIM ===================== */
/* 渐进增强：仅当 JS 启用(.js)时才隐藏，避免无 JS / 观察器异常导致内容不可见 */
.js .reveal{opacity:0;transform:translateY(30px);transition:.7s cubic-bezier(.2,.7,.3,1)}
.js .reveal.in{opacity:1;transform:none}

/* ===================== RESPONSIVE ===================== */
/* 中屏：收起品牌长文字、收紧菜单间距，避免 7 个导航项溢出把「微信服务号」挤到屏幕外 */
@media(max-width:1200px){
  .nav .brand-text{display:none}
  .menu{gap:18px}
  .menu a{font-size:14px}
}
@media(max-width:980px){
  .about-grid,.vision-wrap,.contact-grid{grid-template-columns:1fr;gap:36px}
  .research-grid,.experts-grid,.output-grid,.news-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:30px}
  .mission-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
/* 折叠为汉堡菜单的断点提前到 1080px，保证窄屏下导航项（含微信服务号）可通过汉堡菜单访问 */
@media(max-width:1080px){
  .menu{position:fixed;top:64px;right:0;flex-direction:column;background:#fff;width:240px;padding:20px;gap:14px;box-shadow:var(--shadow);transform:translateX(120%);transition:.3s;border-radius:0 0 0 16px}
  .menu.open{transform:none}
  .menu a{color:var(--ink)!important;font-size:15px}
  .hamburger{display:flex}
  .nav .brand-text{display:none}
  .emblem{height:32px;max-width:150px}
  .hero-content{padding-top:100px}
}
/* 手机竖屏：网格单列，避免内容过窄 */
@media(max-width:680px){
  .research-grid,.experts-grid,.output-grid,.news-grid,.stats-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .emblem{height:28px;max-width:130px;padding:3px 6px}
  .wechat-grid{grid-template-columns:1fr}
}