/* 海角社区 HAI JIAO - 全站样式 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.7;color:#3C485A;background:#FFFFFF;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:#1677EE;text-decoration:none;transition:color .2s}
a:hover{color:#075FC6}
a:focus-visible{outline:2px solid #3395FF;outline-offset:2px}
button{font-family:inherit;cursor:pointer;border:none;background:none}
ul,ol{list-style:none}
.container{width:100%;max-width:1320px;margin:0 auto;padding:0 24px}
.narrow{max-width:820px;margin-left:auto;margin-right:auto}
.mid{max-width:1100px;margin-left:auto;margin-right:auto}

/* 颜色变量 */
:root{
  --brand:#1677EE;
  --brand-light:#3395FF;
  --brand-dark:#075FC6;
  --brand-deep:#08488D;
  --navy:#0A315E;
  --footer-bg:#071D37;
  --bg:#FFFFFF;
  --bg-soft:#F7FAFF;
  --bg-blue:#EDF5FF;
  --bg-soft-blue:#E5F1FF;
  --title:#16243A;
  --text:#3C485A;
  --text-sec:#6B7787;
  --text-muted:#929BA8;
  --white:#FFFFFF;
  --light-blue-text:#DCEEFF;
  --border:rgba(22,119,238,0.12);
  --border-dark:rgba(255,255,255,0.12);
  --shadow:0 12px 34px rgba(30,72,120,0.08);
  --shadow-brand:0 14px 40px rgba(22,119,238,0.14);
  --radius:12px;
  --radius-sm:8px;
  --radius-lg:16px;
}

/* 顶部导航 */
.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,0.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);height:72px}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;max-width:1320px;margin:0 auto;padding:0 24px;gap:16px}
.brand-area{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-area a{display:flex;align-items:center;gap:10px;color:var(--title);font-weight:600;font-size:18px}
.logo-img{height:36px;width:auto;object-fit:contain}
.nav-desktop{display:flex;align-items:center;gap:4px;flex:1;justify-content:center}
.nav-desktop a{padding:8px 14px;font-size:15px;color:var(--text);border-radius:20px;white-space:nowrap;min-height:44px;display:inline-flex;align-items:center}
.nav-desktop a:hover{background:var(--bg-blue);color:var(--brand)}
.nav-desktop a.active{background:var(--bg-soft-blue);color:var(--brand);font-weight:600;position:relative}
.nav-desktop a.active::after{content:"";position:absolute;bottom:4px;left:50%;transform:translateX(-50%);width:5px;height:5px;background:var(--brand);border-radius:50%}
.nav-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}
.nav-actions a,.nav-actions button{padding:8px 14px;font-size:14px;color:var(--text);border-radius:20px;min-height:44px;min-width:44px;display:inline-flex;align-items:center;justify-content:center}
.nav-actions a:hover,.nav-actions button:hover{background:var(--bg-blue);color:var(--brand)}
.btn-menu{display:none}
.mobile-top{display:none;align-items:center;justify-content:space-between;height:62px;padding:0 16px;background:#fff;border-bottom:1px solid var(--border)}
.mobile-top .brand-area a{font-size:16px}
.mobile-top .logo-img{height:30px}
.mobile-top button{min-width:44px;min-height:44px;display:flex;align-items:center;justify-content:center;color:var(--title);font-size:20px}

/* 主按钮 */
.btn-primary{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;font-size:15px;font-weight:600;color:#FFFFFF;background:linear-gradient(135deg,#3998FF 0%,#1677EE 55%,#075FC6 100%);border-radius:28px;box-shadow:var(--shadow-brand);transition:transform .2s,box-shadow .2s;min-height:44px}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 44px rgba(22,119,238,0.22);color:#FFFFFF}
.btn-outline{display:inline-flex;align-items:center;justify-content:center;padding:11px 24px;font-size:14px;font-weight:500;color:var(--brand);background:transparent;border:1.5px solid var(--brand);border-radius:28px;min-height:44px}
.btn-outline:hover{background:var(--bg-blue);color:var(--brand-dark)}

/* 超级菜单 */
.mega-overlay{position:fixed;inset:0;background:rgba(7,29,55,0.45);z-index:1100;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .25s,visibility .25s}
.mega-overlay.open{opacity:1;visibility:visible;pointer-events:auto}
.mega-menu{position:fixed;top:0;right:0;width:min(920px,100%);height:100%;background:#fff;z-index:1101;transform:translateX(100%);transition:transform .3s ease;overflow-y:auto;padding:32px 40px 80px;box-shadow:-8px 0 40px rgba(0,0,0,0.12)}
.mega-menu.open{transform:translateX(0)}
.mega-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:32px}
.mega-header .brand-area{gap:12px}
.mega-close{width:44px;height:44px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--bg-soft);color:var(--title);font-size:22px}
.mega-close:hover{background:var(--bg-blue)}
.mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.mega-col h3{font-size:14px;font-weight:600;color:var(--brand);margin-bottom:14px;letter-spacing:0.5px}
.mega-col a{display:block;padding:8px 0;font-size:15px;color:var(--text);min-height:40px}
.mega-col a:hover{color:var(--brand)}
.mega-brand-note{margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:14px;color:var(--text-sec);line-height:1.6}

/* 搜索面板 */
.search-panel{position:fixed;top:0;left:0;right:0;background:#fff;z-index:1102;padding:24px;box-shadow:var(--shadow);transform:translateY(-100%);transition:transform .3s;visibility:hidden;pointer-events:none}
.search-panel.open{transform:translateY(0);visibility:visible;pointer-events:auto}
.search-inner{max-width:720px;margin:0 auto;display:flex;gap:12px;align-items:center}
.search-inner input{flex:1;height:48px;padding:0 18px;border:1.5px solid var(--border);border-radius:24px;font-size:16px;outline:none}
.search-inner input:focus{border-color:var(--brand)}
.search-close{width:44px;height:44px;border-radius:50%;background:var(--bg-soft);display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--title)}

/* 移动底部导航 */
.mobile-bottom{display:none;position:fixed;bottom:0;left:0;right:0;height:calc(56px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--border);z-index:900;justify-content:space-around;align-items:center}
.mobile-bottom a{display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:11px;color:var(--text-sec);min-width:56px;min-height:48px;gap:2px}
.mobile-bottom a.active{color:var(--brand)}
.mobile-bottom .ico{font-size:20px;line-height:1}

/* 主内容区 */
main{min-height:60vh;padding-bottom:40px}
.page-hero{padding:48px 0 32px;background:linear-gradient(180deg,var(--bg-soft) 0%,#fff 100%)}
.page-hero h1{font-size:40px;font-weight:700;color:var(--title);line-height:1.3;margin-bottom:12px}
.page-hero .lead{font-size:17px;color:var(--text-sec);max-width:640px;line-height:1.7}
.section{padding:56px 0}
.section-title{font-size:30px;font-weight:700;color:var(--title);margin-bottom:8px}
.section-desc{font-size:16px;color:var(--text-sec);margin-bottom:32px;max-width:640px}
.section-soft{background:var(--bg-soft)}
.section-blue{background:var(--bg-blue)}

/* 首页主Banner */
.hero-banner{position:relative;width:100%;aspect-ratio:16/7;max-height:520px;overflow:hidden;background:linear-gradient(135deg,#E5F1FF 0%,#EDF5FF 40%,#D6E8FF 100%);border-radius:0 0 24px 24px}
.hero-banner img{width:100%;height:100%;object-fit:cover}
.hero-content{position:absolute;inset:0;display:flex;align-items:center;padding:0 48px;background:linear-gradient(90deg,rgba(7,29,55,0.72) 0%,rgba(10,49,94,0.45) 55%,transparent 100%)}
.hero-text{max-width:520px;color:#fff}
.hero-text h1{font-size:48px;font-weight:700;line-height:1.25;margin-bottom:14px;color:#FFFFFF}
.hero-text p{font-size:17px;line-height:1.7;color:#DCEEFF;margin-bottom:24px}
.hero-nav-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:-40px;position:relative;z-index:2;padding:0 24px;max-width:1320px;margin-left:auto;margin-right:auto}
.hero-nav-card{background:#fff;border-radius:var(--radius);padding:24px 20px;box-shadow:var(--shadow);text-align:center;transition:transform .2s,box-shadow .2s;border:1px solid var(--border)}
.hero-nav-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-brand)}
.hero-nav-card .ico{font-size:28px;margin-bottom:10px}
.hero-nav-card h3{font-size:16px;font-weight:600;color:var(--title);margin-bottom:6px}
.hero-nav-card p{font-size:13px;color:var(--text-sec);line-height:1.5}

/* 内容卡片 */
.card-grid{display:grid;gap:24px}
.card-grid-3{grid-template-columns:repeat(3,1fr)}
.card-grid-2{grid-template-columns:repeat(2,1fr)}
.card-grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;transition:box-shadow .2s}
.card:hover{box-shadow:var(--shadow)}
.card-body{padding:20px 22px}
.card h3{font-size:18px;font-weight:600;color:var(--title);margin-bottom:8px;line-height:1.4}
.card p{font-size:15px;color:var(--text);line-height:1.65}
.card .meta{font-size:13px;color:var(--text-muted);margin-top:12px}
.feature-row{display:grid;grid-template-columns:1.1fr 0.9fr;gap:40px;align-items:center}
.feature-row.reverse{grid-template-columns:0.9fr 1.1fr}
.feature-row img,.city-feature-image,.app-preview-image{width:100%;border-radius:var(--radius-lg);object-fit:cover;aspect-ratio:4/3;background:linear-gradient(135deg,#E5F1FF,#F7FAFF)}
.app-preview-image{aspect-ratio:9/16;max-height:520px;object-fit:contain;background:linear-gradient(180deg,#EDF5FF,#F7FAFF);margin:0 auto}
.media-slot{background:linear-gradient(145deg,#E5F1FF 0%,#F7FAFF 60%,#FFFFFF 100%);border-radius:var(--radius);overflow:hidden;position:relative;border:1px solid var(--border)}
.media-slot img{width:100%;height:100%;object-fit:cover}
.media-slot.wide{aspect-ratio:16/9}
.media-slot.mid{aspect-ratio:4/3}
.media-slot.sm{aspect-ratio:1/1}

/* 时间板 / 路线 */
.time-board{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.time-card{background:var(--bg-soft);border-radius:var(--radius);padding:22px 18px;border:1px solid var(--border)}
.time-card .label{font-size:13px;font-weight:600;color:var(--brand);margin-bottom:8px}
.time-card h3{font-size:17px;color:var(--title);margin-bottom:8px}
.time-card p{font-size:14px;color:var(--text);line-height:1.6}

/* 兴趣墙 */
.interest-wall{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.interest-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px 14px;text-align:center;transition:border-color .2s,box-shadow .2s}
.interest-item:hover{border-color:rgba(22,119,238,0.35);box-shadow:var(--shadow)}
.interest-item h3{font-size:16px;font-weight:600;color:var(--title);margin-bottom:6px}
.interest-item p{font-size:13px;color:var(--text-sec);line-height:1.5}

/* 列表式 */
.list-block{display:flex;flex-direction:column;gap:16px}
.list-item{display:flex;gap:18px;padding:20px;background:#fff;border-radius:var(--radius);border:1px solid var(--border)}
.list-item .num{flex-shrink:0;width:36px;height:36px;border-radius:50%;background:var(--bg-soft-blue);color:var(--brand);font-weight:600;display:flex;align-items:center;justify-content:center;font-size:15px}
.list-item h3{font-size:17px;color:var(--title);margin-bottom:6px}
.list-item p{font-size:15px;color:var(--text);line-height:1.65}

/* 故事 */
.story-main{background:var(--bg-soft);border-radius:var(--radius-lg);padding:36px 40px;margin-bottom:28px;border:1px solid var(--border)}
.story-main h2{font-size:24px;color:var(--title);margin-bottom:16px}
.story-main p{font-size:16px;line-height:1.8;color:var(--text);margin-bottom:12px}
.story-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.story-card{background:#fff;border-radius:var(--radius);padding:22px;border:1px solid var(--border)}
.story-card h3{font-size:17px;color:var(--title);margin-bottom:8px}
.story-card p{font-size:14px;color:var(--text);line-height:1.65}

/* 安全深蓝区 */
.security-block{background:var(--navy);color:#fff;border-radius:var(--radius-lg);padding:40px 36px}
.security-block h2{font-size:26px;color:#FFFFFF;margin-bottom:16px}
.security-block p,.security-block li{color:#DCEEFF;font-size:15px;line-height:1.7}
.security-block ul{margin-top:16px}
.security-block li{padding-left:18px;position:relative;margin-bottom:10px}
.security-block li::before{content:"·";position:absolute;left:0;color:#3395FF;font-weight:700}

/* 隐私浅色区 */
.privacy-block{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius-lg);padding:36px; }
.privacy-block h2{font-size:24px;color:var(--title);margin-bottom:14px}
.privacy-block p{font-size:15px;color:#3C485A;line-height:1.7}

/* FAQ */
details{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:12px;overflow:hidden}
summary{padding:16px 20px;font-size:16px;font-weight:600;color:var(--title);cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;min-height:52px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:20px;color:var(--brand);font-weight:400}
details[open] summary::after{content:"−"}
details .faq-body{padding:0 20px 18px;font-size:15px;color:var(--text);line-height:1.7}

/* 页脚 */
.site-footer{background:var(--footer-bg);color:#DCEEFF;padding:56px 0 32px;margin-top:60px}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1.2fr;gap:32px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.1)}
.footer-brand .logo-img{height:32px;margin-bottom:12px;filter:brightness(0) invert(1)}
.footer-brand .name{font-size:18px;font-weight:600;color:#FFFFFF;margin-bottom:4px}
.footer-brand .en{font-size:13px;color:#A8C4E0;margin-bottom:14px}
.footer-brand p{font-size:14px;line-height:1.7;color:#A8C4E0;max-width:280px}
.footer-col h4{font-size:14px;font-weight:600;color:#FFFFFF;margin-bottom:14px}
.footer-col a{display:block;font-size:14px;color:#A8C4E0;padding:5px 0;min-height:32px}
.footer-col a:hover{color:#FFFFFF}
.footer-bottom{padding-top:24px;text-align:center;font-size:13px;color:#7A95B0}

/* 通用工具 */
.tag{display:inline-block;padding:4px 10px;font-size:12px;border-radius:12px;background:var(--bg-soft-blue);color:var(--brand);font-weight:500}
.divider{height:1px;background:var(--border);margin:32px 0}
.text-center{text-align:center}
.mt-24{margin-top:24px}
.mb-16{margin-bottom:16px}
.mb-24{margin-bottom:24px}
.mb-32{margin-bottom:32px}
.mb-40{margin-bottom:40px}

/* 响应式 */
@media (max-width:1279px){
  .hero-text h1{font-size:40px}
  .page-hero h1{font-size:36px}
  .section-title{font-size:28px}
  .interest-wall{grid-template-columns:repeat(4,1fr)}
  .footer-top{grid-template-columns:1fr 1fr 1fr;gap:28px}
}
@media (max-width:1023px){
  .nav-desktop{display:none}
  .btn-menu{display:inline-flex}
  .header-inner{display:none}
  .mobile-top{display:flex}
  .site-header{height:62px}
  .hero-banner{aspect-ratio:16/10;max-height:380px;border-radius:0}
  .hero-content{padding:0 24px}
  .hero-text h1{font-size:32px}
  .hero-text p{font-size:15px}
  .hero-nav-grid{grid-template-columns:repeat(2,1fr);margin-top:24px;padding:0 16px}
  .feature-row,.feature-row.reverse{grid-template-columns:1fr;gap:24px}
  .card-grid-3,.card-grid-4{grid-template-columns:repeat(2,1fr)}
  .time-board{grid-template-columns:repeat(2,1fr)}
  .interest-wall{grid-template-columns:repeat(3,1fr)}
  .mega-grid{grid-template-columns:repeat(2,1fr)}
  .mega-menu{width:100%;padding:24px 20px 80px}
  .footer-top{grid-template-columns:1fr 1fr}
  .mobile-bottom{display:flex}
  main{padding-bottom:80px}
  .story-grid{grid-template-columns:1fr}
  .app-preview-image{max-width:280px;max-height:420px}
}
@media (max-width:767px){
  .container{padding:0 16px}
  .page-hero{padding:32px 0 24px}
  .page-hero h1{font-size:30px}
  .section{padding:40px 0}
  .section-title{font-size:24px}
  .card-grid-2,.card-grid-3,.card-grid-4{grid-template-columns:1fr}
  .time-board{grid-template-columns:1fr}
  .interest-wall{grid-template-columns:repeat(2,1fr)}
  .list-item{flex-direction:column;gap:10px}
  .story-main{padding:24px 20px}
  .security-block,.privacy-block{padding:28px 20px}
  .hero-nav-card{padding:18px 14px}
  .footer-top{grid-template-columns:1fr;gap:24px}
  .mega-grid{grid-template-columns:1fr}
}
@media (max-width:559px){
  .hero-text h1{font-size:28px}
  .page-hero h1{font-size:26px}
  .interest-wall{grid-template-columns:1fr 1fr}
  .btn-primary{padding:11px 22px;font-size:14px}
}

/* 防止横向滚动与遮挡 */
body.menu-open{overflow:hidden}
.no-scroll{overflow:hidden}