/* 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","Helvetica Neue",Arial,sans-serif;font-size:16px;line-height:1.7;color:#3C485A;background:#FFFFFF;overflow-x:hidden}
img{max-width:100%;height:auto;display:block;border:0}
a{color:#1677EE;text-decoration:none;transition:color .2s ease,background .2s ease,opacity .2s ease}
a:hover{color:#075FC6}
a:focus-visible{outline:2px solid #3395FF;outline-offset:2px}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.container{width:100%;max-width:1320px;margin:0 auto;padding:0 24px}
.container-narrow{max-width:820px;margin:0 auto;padding:0 24px}
.container-mid{max-width:1100px;margin:0 auto;padding:0 24px}

/* 颜色变量 */
:root{
  --brand:#1677EE;
  --brand-light:#3395FF;
  --brand-dark:#075FC6;
  --brand-deeper:#08488D;
  --navy:#0A315E;
  --navy-deep:#071D37;
  --bg:#FFFFFF;
  --bg-soft:#F7FAFF;
  --bg-blue:#EDF5FF;
  --bg-soft-blue:#E5F1FF;
  --title:#16243A;
  --text:#3C485A;
  --text-sec:#6B7787;
  --text-mute:#929BA8;
  --white:#FFFFFF;
  --light-blue:#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);
  --btn-grad:linear-gradient(135deg,#3998FF 0%,#1677EE 55%,#075FC6 100%);
  --radius:12px;
  --radius-sm:8px;
  --header-h:74px;
  --mobile-header-h:62px;
  --mobile-bottom-h:58px;
}

/* 顶部导航 - 桌面 */
.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:var(--header-h)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);max-width:1320px;margin:0 auto;padding:0 24px;gap:16px}
.brand-block{display:flex;align-items:center;gap:10px;flex-shrink:0;min-width:0}
.brand-block a{display:flex;align-items:center;gap:10px;color:var(--title)}
.brand-logo{height:36px;width:auto;object-fit:contain}
.brand-name{font-size:18px;font-weight:700;color:var(--title);white-space:nowrap}
.brand-en{font-size:11px;color:var(--text-sec);letter-spacing:0.06em;margin-left:2px}

.nav-desktop{display:flex;align-items:center;gap:4px;flex:1;justify-content:center;min-width:0}
.nav-desktop a{position:relative;padding:10px 12px;font-size:15px;color:var(--text);border-radius:8px;white-space:nowrap;min-height:44px;display:inline-flex;align-items:center}
.nav-desktop a:hover{color:var(--brand);background:var(--bg-soft)}
.nav-desktop a.active{color:var(--brand);background:var(--bg-blue);font-weight:600}
.nav-desktop a.active::after{content:"";position:absolute;bottom:4px;left:50%;transform:translateX(-50%);width:5px;height:5px;border-radius:50%;background:var(--brand)}

.header-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}
.header-actions a,.header-actions button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px;padding:8px 12px;font-size:14px;color:var(--text);border-radius:8px}
.header-actions a:hover,.header-actions button:hover{color:var(--brand);background:var(--bg-soft)}
.btn-app{background:var(--btn-grad)!important;color:#fff!important;padding:8px 16px!important;border-radius:20px!important;font-weight:600}
.btn-app:hover{opacity:.92;color:#fff!important}
.menu-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;padding:10px}
.menu-toggle span{display:block;width:20px;height:2px;background:var(--title);border-radius:1px;transition:transform .2s}

/* 手机顶部 */
.mobile-header{display:none;position:sticky;top:0;z-index:1000;background:rgba(255,255,255,0.97);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);height:var(--mobile-header-h)}
.mobile-header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;padding:0 12px;max-width:1320px;margin:0 auto}
.mobile-header .brand-logo{height:30px}
.mobile-header .brand-name{font-size:16px}
.mobile-header .menu-toggle,.mobile-header .search-toggle{display:flex}

/* 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;line-height:1.25;color:var(--title);font-weight:700;margin-bottom:12px}
.page-hero .lead{font-size:16px;color:var(--text-sec);max-width:720px;line-height:1.75}
.section{padding:48px 0}
.section-soft{background:var(--bg-soft)}
.section-blue{background:var(--bg-blue)}
.section-title{font-size:30px;color:var(--title);font-weight:700;margin-bottom:8px}
.section-desc{font-size:15px;color:var(--text-sec);margin-bottom:28px;max-width:680px}
.section-header{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:28px;flex-wrap:wrap}
.section-header .more{font-size:14px;color:var(--brand);font-weight:500}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;font-size:15px;font-weight:600;border-radius:24px;min-height:44px;transition:opacity .2s,transform .15s}
.btn-primary{background:var(--btn-grad);color:#fff}
.btn-primary:hover{opacity:.92;color:#fff}
.btn-outline{border:1.5px solid var(--brand);color:var(--brand);background:#fff}
.btn-outline:hover{background:var(--bg-blue)}
.btn-ghost{color:var(--brand);background:transparent}
.btn-ghost:hover{background:var(--bg-soft)}

/* 首页 Hero Banner */
.hero-banner{position:relative;width:100%;aspect-ratio:16/7;max-height:520px;overflow:hidden;border-radius:0;background:linear-gradient(135deg,#0A315E 0%,#1677EE 50%,#3395FF 100%)}
.hero-banner img{width:100%;height:100%;object-fit:cover;object-position:center}
.hero-banner-fallback{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0A315E 0%,#1677EE 45%,#3395FF 100%)}
.hero-content{position:absolute;inset:0;display:flex;align-items:center;background:linear-gradient(90deg,rgba(7,29,55,0.72) 0%,rgba(10,49,94,0.45) 55%,transparent 100%)}
.hero-content-inner{max-width:1320px;margin:0 auto;padding:0 40px;width:100%}
.hero-content h1{font-size:48px;color:#fff;font-weight:700;line-height:1.2;margin-bottom:14px;max-width:560px;text-shadow:0 2px 12px rgba(0,0,0,0.25)}
.hero-content p{font-size:17px;color:#DCEEFF;max-width:480px;line-height:1.7;margin-bottom:24px}
.hero-content .btn{box-shadow:0 8px 24px rgba(0,0,0,0.2)}

/* 四格入口 */
.quad-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:-36px;position:relative;z-index:2;padding:0 24px;max-width:1320px;margin-left:auto;margin-right:auto}
.quad-card{background:#fff;border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s,box-shadow .2s}
.quad-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-brand)}
.quad-card h3{font-size:17px;color:var(--title);margin-bottom:6px;font-weight:600}
.quad-card p{font-size:13px;color:var(--text-sec);line-height:1.55}

/* 内容卡片通用 */
.card-grid{display:grid;gap:20px}
.card-grid-2{grid-template-columns:repeat(2,1fr)}
.card-grid-3{grid-template-columns:repeat(3,1fr)}
.card-grid-4{grid-template-columns:repeat(4,1fr)}
.content-card{background:#fff;border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;transition:box-shadow .2s}
.content-card:hover{box-shadow:var(--shadow)}
.content-card .card-body{padding:20px 22px}
.content-card h3{font-size:18px;color:var(--title);margin-bottom:8px;font-weight:600;line-height:1.4}
.content-card p{font-size:14px;color:var(--text-sec);line-height:1.65}
.content-card .meta{font-size:12px;color:var(--text-mute);margin-top:10px}

/* 今日值得看 */
.today-feature{display:grid;grid-template-columns:1.4fr 1fr;gap:24px}
.today-main{background:var(--bg-soft);border-radius:var(--radius);padding:28px;border:1px solid var(--border)}
.today-main h2{font-size:24px;color:var(--title);margin-bottom:12px;line-height:1.35}
.today-main p{font-size:15px;color:var(--text);line-height:1.75;margin-bottom:16px}
.today-side{display:flex;flex-direction:column;gap:16px}
.today-side .item{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px 20px}
.today-side .item h3{font-size:16px;color:var(--title);margin-bottom:6px}
.today-short{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:20px}
.today-short .item{background:var(--bg-soft);border-radius:var(--radius-sm);padding:16px 18px;border:1px solid var(--border)}
.today-short h4{font-size:15px;color:var(--title);margin-bottom:4px}

/* 城市生活志图文 */
.city-feature{display:grid;grid-template-columns:1.15fr 1fr;gap:36px;align-items:center}
.city-feature-image{position:relative;aspect-ratio:4/3;border-radius:var(--radius);overflow:hidden;background:linear-gradient(145deg,var(--bg-blue),var(--bg-soft));border:1px solid var(--border)}
.city-feature-image img{width:100%;height:100%;object-fit:cover}
.city-feature-text h2{font-size:28px;color:var(--title);margin-bottom:14px}
.city-feature-text p{font-size:15px;color:var(--text);line-height:1.8;margin-bottom:12px}
.city-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.city-tags span{font-size:13px;padding:6px 12px;background:var(--bg-blue);color:var(--brand-dark);border-radius:16px}

/* 周末时间板 */
.time-board{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.time-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px 20px;position:relative}
.time-card .time-label{font-size:13px;font-weight:600;color:var(--brand);margin-bottom:10px;letter-spacing:0.04em}
.time-card h3{font-size:17px;color:var(--title);margin-bottom:8px}
.time-card p{font-size:14px;color:var(--text-sec);line-height:1.65}

/* 旅行路线 */
.route-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.route-step{background:var(--bg-soft);border-radius:var(--radius);padding:22px;border:1px solid var(--border)}
.route-step .step-num{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;background:var(--brand);color:#fff;border-radius:50%;font-size:13px;font-weight:700;margin-bottom:12px}
.route-step h3{font-size:17px;color:var(--title);margin-bottom:8px}
.route-step p{font-size:14px;color:var(--text-sec);line-height:1.65}

/* 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 16px;text-align:center;transition:border-color .2s,box-shadow .2s}
.interest-item:hover{border-color:rgba(22,119,238,0.3);box-shadow:var(--shadow)}
.interest-item h3{font-size:16px;color:var(--title);margin-bottom:6px;font-weight:600}
.interest-item p{font-size:13px;color:var(--text-sec);line-height:1.5}

/* 经验列表 */
.exp-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.exp-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px}
.exp-item h3{font-size:16px;color:var(--title);margin-bottom:8px;font-weight:600}
.exp-item p{font-size:14px;color:var(--text-sec);line-height:1.7}

/* 文化专题 */
.culture-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.culture-card{background:var(--bg-soft);border-radius:var(--radius);padding:24px;border:1px solid var(--border)}
.culture-card h3{font-size:18px;color:var(--title);margin-bottom:10px}
.culture-card p{font-size:14px;color:var(--text);line-height:1.75}

/* 故事 */
.story-main{background:var(--bg-soft);border-radius:var(--radius);padding:32px;border:1px solid var(--border);margin-bottom:24px}
.story-main h2{font-size:22px;color:var(--title);margin-bottom:14px;line-height:1.35}
.story-main p{font-size:15px;color:var(--text);line-height:1.85;margin-bottom:12px}
.story-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.story-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px 20px}
.story-card h3{font-size:16px;color:var(--title);margin-bottom:6px}
.story-card p{font-size:13px;color:var(--text-sec);line-height:1.65}

/* 热议主题 */
.topic-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.topic-item{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px 20px}
.topic-item .num{flex-shrink:0;width:28px;height:28px;background:var(--bg-blue);color:var(--brand);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
.topic-item h3{font-size:16px;color:var(--title);margin-bottom:4px}
.topic-item p{font-size:13px;color:var(--text-sec);line-height:1.55}

/* 指南 */
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.guide-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:box-shadow .2s}
.guide-card:hover{box-shadow:var(--shadow)}
.guide-card h3{font-size:17px;color:var(--title);margin-bottom:8px}
.guide-card p{font-size:14px;color:var(--text-sec);line-height:1.7}

/* 影集媒体槽 */
.media-grid{display:grid;grid-template-columns:2fr 1fr 1fr;grid-template-rows:auto auto;gap:12px}
.media-slot{position:relative;border-radius:var(--radius-sm);overflow:hidden;background:linear-gradient(145deg,#EDF5FF 0%,#F7FAFF 50%,#FFFFFF 100%);border:1px solid var(--border);aspect-ratio:16/9}
.media-slot.wide{grid-row:1/3;aspect-ratio:auto;min-height:320px}
.media-slot.mid{aspect-ratio:4/3}
.media-slot.small{aspect-ratio:1/1}
.media-slot img{width:100%;height:100%;object-fit:cover}
.media-slot .slot-label{position:absolute;bottom:0;left:0;right:0;padding:12px 14px;background:linear-gradient(transparent,rgba(7,29,55,0.75));color:#fff;font-size:13px}

/* 脉搏信息条 */
.pulse-list{display:flex;flex-direction:column;gap:12px}
.pulse-item{display:flex;gap:16px;align-items:flex-start;padding:16px 20px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm)}
.pulse-item .tag{flex-shrink:0;font-size:12px;padding:4px 10px;background:var(--bg-blue);color:var(--brand-dark);border-radius:4px;font-weight:600}
.pulse-item p{font-size:14px;color:var(--text);line-height:1.6}

/* APP 区域 */
.app-section{display:grid;grid-template-columns:1.1fr 0.9fr;gap:40px;align-items:center}
.app-preview-image{position:relative;max-height:520px;display:flex;align-items:center;justify-content:center;background:linear-gradient(160deg,var(--bg-blue),var(--bg-soft));border-radius:var(--radius);border:1px solid var(--border);padding:24px;aspect-ratio:9/16;max-width:280px;margin:0 auto}
.app-preview-image img{max-height:480px;width:auto;object-fit:contain}
.app-text h2{font-size:28px;color:var(--title);margin-bottom:14px}
.app-text p{font-size:15px;color:var(--text);line-height:1.8;margin-bottom:12px}
.app-features{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:20px 0}
.app-features span{font-size:14px;color:var(--text);padding:8px 12px;background:var(--bg-soft);border-radius:8px}

/* 安全中心深蓝 */
.security-hero{background:var(--navy);color:#fff;padding:56px 0;border-radius:0}
.security-hero h1{color:#fff;font-size:36px;margin-bottom:12px}
.security-hero p{color:#DCEEFF;font-size:16px;max-width:640px;line-height:1.75}
.security-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:32px}
.security-item{background:rgba(255,255,255,0.08);border:1px solid var(--border-dark);border-radius:var(--radius);padding:22px}
.security-item h3{color:#fff;font-size:17px;margin-bottom:8px}
.security-item p{color:#DCEEFF;font-size:14px;line-height:1.7}

/* 隐私 */
.privacy-block{background:#fff;border:1.5px solid var(--bg-blue);border-radius:var(--radius);padding:28px;margin-bottom:20px}
.privacy-block h3{font-size:18px;color:var(--title);margin-bottom:10px}
.privacy-block p,.privacy-block li{font-size:15px;color:#3C485A;line-height:1.8}
.privacy-block ul{padding-left:18px;list-style:disc}
.privacy-block li{margin-bottom:6px}

/* 页脚 */
.site-footer{background:var(--navy-deep);color:#DCEEFF;padding:56px 0 32px;margin-top:60px;border-top:1px solid rgba(220,238,255,0.15)}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1.2fr;gap:32px;margin-bottom:40px}
.footer-brand .brand-logo{height:32px;margin-bottom:12px;filter:brightness(1.1)}
.footer-brand .brand-name{font-size:18px;color:#fff;font-weight:700;display:block;margin-bottom:4px}
.footer-brand .brand-en{font-size:12px;color:#A8C4E0;letter-spacing:0.08em}
.footer-brand p{font-size:13px;color:#A8C4E0;line-height:1.7;margin-top:14px;max-width:280px}
.footer-col h4{font-size:14px;color:#fff;font-weight:600;margin-bottom:14px}
.footer-col a{display:block;font-size:13px;color:#A8C4E0;padding:5px 0;min-height:auto}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding-top:24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:13px;color:#7A9AB8}

/* 频道抽屉 / Mega Menu */
.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;visibility:hidden;pointer-events:none}
.mega-menu.open{transform:translateX(0);visibility:visible;pointer-events:auto}
.mega-header{display:flex;align-items:center;justify-content:space-between;padding:18px 28px;border-bottom:1px solid var(--border);position:sticky;top:0;background:#fff;z-index:2}
.mega-header .brand{display:flex;align-items:center;gap:10px}
.mega-header .brand-logo{height:28px}
.mega-close{width:44px;height:44px;display:flex;align-items:center;justify-content:center;font-size:22px;color:var(--text);border-radius:8px}
.mega-close:hover{background:var(--bg-soft)}
.mega-body{padding:28px 32px 48px}
.mega-group{margin-bottom:28px}
.mega-group h3{font-size:13px;color:var(--text-mute);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:12px;font-weight:600}
.mega-links{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.mega-links a{display:block;padding:12px 14px;font-size:15px;color:var(--title);border-radius:8px;min-height:44px}
.mega-links a:hover{background:var(--bg-soft);color:var(--brand)}

/* 搜索面板 */
.search-panel{position:fixed;top:0;left:0;right:0;background:#fff;z-index:1102;padding:20px 24px 28px;box-shadow:var(--shadow);transform:translateY(-100%);transition:transform .25s;visibility:hidden;pointer-events:none}
.search-panel.open{transform:translateY(0);visibility:visible;pointer-events:auto}
.search-panel-inner{max-width:720px;margin:0 auto}
.search-panel form{display:flex;gap:10px}
.search-panel input{flex:1;padding:14px 18px;font-size:16px;border:1.5px solid var(--border);border-radius:12px;outline:none;color:var(--title)}
.search-panel input:focus{border-color:var(--brand)}
.search-panel button[type=submit]{padding:14px 24px;background:var(--btn-grad);color:#fff;border-radius:12px;font-weight:600;font-size:15px;min-height:48px}
.search-close{position:absolute;right:20px;top:16px;width:44px;height:44px;display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--text)}

/* 手机底部导航 */
.mobile-bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;height:calc(var(--mobile-bottom-h) + env(safe-area-inset-bottom,0px));padding-bottom:env(safe-area-inset-bottom,0px);background:rgba(255,255,255,0.97);backdrop-filter:blur(12px);border-top:1px solid var(--border);z-index:900;justify-content:space-around;align-items:center}
.mobile-bottom-nav a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:11px;color:var(--text-sec);min-width:56px;min-height:48px;padding:6px 4px}
.mobile-bottom-nav a.active{color:var(--brand);font-weight:600}
.mobile-bottom-nav .icon{width:22px;height:22px;display:flex;align-items:center;justify-content:center;font-size:18px}

/* 内页通用内容块 */
.article-body{font-size:16px;line-height:1.85;color:var(--text);max-width:800px}
.article-body p{margin-bottom:16px}
.article-body h2{font-size:24px;color:var(--title);margin:32px 0 14px;font-weight:700}
.article-body h3{font-size:19px;color:var(--title);margin:24px 0 10px;font-weight:600}
.article-body ul,.article-body ol{margin:12px 0 16px 20px}
.article-body li{margin-bottom:8px;list-style:disc}
.article-body ol li{list-style:decimal}

/* FAQ */
.faq-list details{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden}
.faq-list 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}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";font-size:18px;color:var(--brand);font-weight:400}
.faq-list details[open] summary::after{content:"−"}
.faq-list .faq-a{padding:0 20px 18px;font-size:15px;color:var(--text);line-height:1.75}

/* 表单（反馈/联系） */
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:14px;color:var(--title);font-weight:600;margin-bottom:6px}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:12px 14px;font-size:15px;border:1.5px solid var(--border);border-radius:10px;color:var(--title);background:#fff;font-family:inherit}
.form-group input:focus,.form-group textarea:focus{border-color:var(--brand);outline:none}
.form-group textarea{min-height:140px;resize:vertical}
.form-note{font-size:13px;color:var(--text-mute);margin-top:8px}

/* 规则章节 */
.rule-chapter{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 32px;margin-bottom:20px}
.rule-chapter h2{font-size:20px;color:var(--title);margin-bottom:12px}
.rule-chapter p,.rule-chapter li{font-size:15px;color:var(--text);line-height:1.8}
.rule-chapter ul{padding-left:18px;list-style:disc;margin-top:8px}
.rule-chapter li{margin-bottom:6px}

/* 响应式 */
@media (max-width:1280px){
  .container{padding:0 20px}
  .nav-desktop a{padding:10px 10px;font-size:14px}
  .hero-content h1{font-size:42px}
  .interest-wall{grid-template-columns:repeat(5,1fr)}
}
@media (max-width:1024px){
  .nav-desktop{gap:2px}
  .nav-desktop a{padding:8px 8px;font-size:13px}
  .quad-nav{grid-template-columns:repeat(2,1fr);margin-top:-28px}
  .today-feature{grid-template-columns:1fr}
  .city-feature{grid-template-columns:1fr;gap:24px}
  .city-feature-image{order:-1;max-height:360px}
  .time-board{grid-template-columns:repeat(2,1fr)}
  .route-steps{grid-template-columns:repeat(2,1fr)}
  .interest-wall{grid-template-columns:repeat(3,1fr)}
  .exp-list{grid-template-columns:1fr}
  .culture-grid{grid-template-columns:1fr}
  .story-grid{grid-template-columns:1fr}
  .topic-list{grid-template-columns:1fr}
  .guide-grid{grid-template-columns:repeat(2,1fr)}
  .media-grid{grid-template-columns:1fr 1fr;grid-template-rows:auto}
  .media-slot.wide{grid-row:auto;min-height:240px;grid-column:1/-1}
  .app-section{grid-template-columns:1fr;gap:28px}
  .app-preview-image{max-width:240px}
  .footer-top{grid-template-columns:1fr 1fr 1fr;gap:24px}
  .footer-brand{grid-column:1/-1}
  .security-list{grid-template-columns:1fr}
  .page-hero h1{font-size:34px}
  .section-title{font-size:26px}
  .hero-banner{aspect-ratio:16/8;max-height:420px}
}
@media (max-width:768px){
  .site-header{display:none}
  .mobile-header{display:block}
  .mobile-bottom-nav{display:flex}
  main{padding-bottom:calc(var(--mobile-bottom-h) + env(safe-area-inset-bottom,0px) + 24px)}
  .hero-banner{aspect-ratio:16/10;max-height:360px}
  .hero-content-inner{padding:0 20px}
  .hero-content h1{font-size:28px;margin-bottom:10px}
  .hero-content p{font-size:14px;margin-bottom:16px}
  .quad-nav{grid-template-columns:1fr 1fr;gap:12px;margin-top:16px;padding:0 16px}
  .quad-card{padding:16px 14px}
  .quad-card h3{font-size:15px}
  .section{padding:36px 0}
  .section-title{font-size:24px}
  .page-hero{padding:32px 0 24px}
  .page-hero h1{font-size:28px}
  .today-short{grid-template-columns:1fr}
  .time-board{grid-template-columns:1fr}
  .route-steps{grid-template-columns:1fr}
  .interest-wall{grid-template-columns:repeat(2,1fr)}
  .guide-grid{grid-template-columns:1fr}
  .mega-menu{width:100%}
  .mega-links{grid-template-columns:1fr}
  .mega-body{padding:20px 20px 40px}
  .footer-top{grid-template-columns:1fr 1fr;gap:20px}
  .app-features{grid-template-columns:1fr}
  .container{padding:0 16px}
}
@media (max-width:560px){
  .hero-content h1{font-size:26px}
  .interest-wall{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr}
  .brand-name{font-size:15px}
  .quad-nav{gap:10px}
}

/* 工具类 */
.text-center{text-align:center}
.mt-8{margin-top:8px}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mb-16{margin-bottom:16px}
.mb-24{margin-bottom:24px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}