/* =========================================================
   Telegram 下載站（模板二 · 深色官方版）
   设计基调：Telegram Desktop 深色主题 —— 深蓝黑底、官方亮蓝、
   胶囊组件、半透明蓝选中态、无位移悬浮反馈
   说明：首屏下载模块样式与模板一完全一致（1:1 复刻 telegram.org），
        其余组件均为本站原创深色设计
   作者：TG Dev Team
   ========================================================= */

:root{
  /* 品牌色（Telegram 官方亮蓝） */
  --brand:#2AABEE;
  --brand-2:#229ED9;
  --brand-hi:#55C1F0;
  --link:#6DB5E8;
  --link-hi:#93CCF2;
  --grad:linear-gradient(180deg,#38B3EC,#2597D3);
  --brand-soft:rgba(42,171,238,.13);
  --brand-soft-2:rgba(42,171,238,.22);

  /* 深色中性色（Telegram Desktop 暗色系） */
  --bg:#0E1621;
  --bg-soft:#121D2A;
  --panel:#17222E;
  --panel-2:#1D2A38;
  --ink:#F2F7FB;
  --text:#B7C7D4;
  --muted:#8398A9;
  --faint:#5E7385;

  /* 描边与阴影 */
  --line:rgba(255,255,255,.07);
  --line-2:rgba(255,255,255,.14);
  --shadow-md:0 18px 44px rgba(0,0,0,.38);
  --shadow-lg:0 30px 80px rgba(0,0,0,.52);
  --glow:0 12px 34px rgba(42,171,238,.30);

  /* 圆角与尺寸 */
  --r-sm:12px;
  --r-md:16px;
  --r-lg:20px;
  --r-xl:26px;
  --r-pill:999px;
  --container:1140px;
  --header-h:64px;
  --font:"Inter","SF Pro Text",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang HK","PingFang TC","Microsoft JhengHei","Noto Sans HK","Noto Sans TC",Roboto,"Helvetica Neue",Arial,sans-serif;
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px;color-scheme:dark}
body{
  font-family:var(--font);
  font-size:16px;
  line-height:1.7;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{display:block;flex-shrink:0}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;background:none;border:none;color:inherit}
input{font-family:inherit}
ul,ol{list-style:none}
::selection{background:rgba(42,171,238,.38);color:#FFF}
::-webkit-scrollbar{width:12px;height:12px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#2A3B4D;border-radius:8px;border:3px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#39506A}

h1,h2,h3,h4{color:var(--ink);line-height:1.3;font-weight:800;letter-spacing:-.015em}

/* ---------- 布局 ---------- */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:88px 0}
.section.tight{padding:56px 0}
.section.alt{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

.lead{font-size:16.5px;line-height:1.85;color:var(--text)}
.muted{color:var(--muted)}
.hl{color:var(--brand-hi)}
.text-center{text-align:center}

.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}
.mt-32{margin-top:32px}.mt-40{margin-top:40px}.mt-56{margin-top:56px}

/* ---------- 眉标 / 胶囊（本站深色版：半透明蓝底 + 亮蓝文字） ---------- */
.eyebrow{
  display:inline-flex;align-items:center;
  padding:6px 15px;border-radius:var(--r-pill);
  background:var(--brand-soft);color:#8CCBF0;
  font-size:12.5px;font-weight:700;letter-spacing:.06em;
  border:1px solid rgba(42,171,238,.22);
}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 15px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.05);border:1px solid var(--line-2);
  font-size:13.5px;font-weight:600;color:var(--text);
}
.chip svg{color:var(--brand-hi)}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--r-pill);
  background:var(--brand-soft);color:#8CCBF0;
  font-size:12.5px;font-weight:700;
}
.pill.blue{background:var(--brand-soft-2);color:#A5D8F7}

/* ---------- 按钮（深色版：胶囊 + 光效悬浮，无位移跳变） ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 26px;border-radius:var(--r-pill);
  font-size:15px;font-weight:700;line-height:1.2;
  border:1px solid transparent;
  transition:background .18s ease,box-shadow .18s ease,color .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.btn svg{width:16px;height:16px}
.btn-primary{
  background:var(--grad);color:#FFF;
  box-shadow:var(--glow),inset 0 1px 0 rgba(255,255,255,.22);
}
.btn-primary:hover{
  background:linear-gradient(180deg,#45BDF2,#2AA3DF);
  box-shadow:0 16px 40px rgba(42,171,238,.42),inset 0 1px 0 rgba(255,255,255,.26);
}
.btn-ghost{
  background:rgba(255,255,255,.05);color:var(--ink);
  border-color:var(--line-2);
}
.btn-ghost:hover{
  border-color:rgba(42,171,238,.55);color:var(--brand-hi);
  background:rgba(42,171,238,.10);
}
.btn-lg{padding:15px 34px;font-size:16px}
.btn-sm{padding:9px 20px;font-size:14px}
.btn-block{width:100%}

.link-more{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:700;color:var(--link);font-size:15.5px;
  transition:color .18s ease;
}
.link-more svg{width:17px;height:17px;transition:transform .18s ease}
.link-more:hover svg{transform:translateX(4px)}
.link-more:hover{color:var(--link-hi)}

/* ---------- 顶部导航（深色玻璃固定栏） ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--header-h);
  background:rgba(14,22,33,.72);
  -webkit-backdrop-filter:blur(16px) saturate(1.5);
  backdrop-filter:blur(16px) saturate(1.5);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.site-header.scrolled{
  background:rgba(13,20,30,.94);
  border-bottom-color:var(--line);
  box-shadow:0 10px 30px rgba(0,0,0,.35);
}
.header-inner{height:var(--header-h);display:flex;align-items:center;gap:26px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-logo{
  width:34px;height:34px;border-radius:50%;
  background:var(--grad);color:#FFF;
  display:inline-flex;align-items:center;justify-content:center;
  box-shadow:0 4px 14px rgba(42,171,238,.4);
}
.brand-logo svg{width:20px;height:20px}
.brand-name{font-size:19px;font-weight:800;color:#FFF;letter-spacing:-.02em}
.brand-tag{
  padding:3px 10px;border-radius:var(--r-pill);
  background:var(--brand-soft);color:#8CCBF0;
  font-size:11px;font-weight:700;letter-spacing:.04em;
  border:1px solid rgba(42,171,238,.22);
}

.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-link{
  padding:8px 15px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;color:var(--muted);
  transition:color .18s ease,background .18s ease;
}
.nav-link:hover{color:var(--ink);background:rgba(255,255,255,.06)}
.nav-link.active{color:#8CCBF0;background:var(--brand-soft)}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:8px}

/* ---------- 语言切换（简体 / 繁體） ---------- */
.lang-switch{
  display:inline-flex;align-items:center;gap:2px;padding:3px;
  border-radius:var(--r-pill);background:rgba(255,255,255,.05);border:1px solid var(--line-2);
}
.lang-btn{
  border:0;background:transparent;border-radius:var(--r-pill);
  padding:5px 12px;font-size:13px;font-weight:700;color:var(--muted);
  cursor:pointer;font-family:inherit;line-height:1.4;
  transition:background .18s ease,color .18s ease;
}
.lang-btn:hover{color:var(--brand-hi)}
.lang-btn.active{background:var(--brand-soft-2);color:#A5D8F7}

.nav-toggle{
  display:none;position:relative;width:40px;height:40px;
  border-radius:var(--r-pill);flex-direction:column;align-items:center;justify-content:center;gap:5px;
}
.nav-toggle span{display:block;width:19px;height:2px;border-radius:2px;background:var(--ink);transition:transform .22s ease,opacity .22s ease}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(max-width:1024px){
  .main-nav{
    position:fixed;top:var(--header-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    background:#131E2B;border-bottom:1px solid var(--line);
    padding:14px 20px 20px;margin-left:0;
    box-shadow:0 24px 48px rgba(0,0,0,.5);
    transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:transform .22s ease,opacity .22s ease;
  }
  .main-nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav-link{padding:12px 14px;font-size:16px}
  .nav-toggle{display:flex}
  .header-actions .hide-md{display:none}
}

/* ---------- 首屏舞台（深色底 + 蓝光晕 + 白色下载舞台卡） ---------- */
.stage{
  position:relative;overflow:hidden;
  padding:calc(var(--header-h) + 64px) 0 44px;
}
.stage::before{
  content:"";position:absolute;inset:-12% -20% auto;height:760px;pointer-events:none;
  background:
    radial-gradient(620px 340px at 22% 2%,rgba(42,171,238,.17),transparent 68%),
    radial-gradient(700px 380px at 82% -4%,rgba(34,158,217,.14),transparent 70%);
}
.stage::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:radial-gradient(rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:26px 26px;
  -webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 42%);
  mask-image:linear-gradient(180deg,#000 0%,transparent 42%);
}
.stage .container{position:relative;z-index:1}
.stage-head{max-width:780px;margin:0 auto 42px;text-align:center}
.stage-head h1{font-size:clamp(1.9rem,3.8vw,2.7rem);color:#FFF;margin:18px 0 14px}
.stage-head .lead{max-width:650px;margin:0 auto;font-size:16.5px}

/* 白色舞台卡：承载 1:1 下载模块（卡内样式与模板一/官网一致） */
.stage-card{
  background:#FFF;border-radius:var(--r-xl);
  padding:18px 24px 8px;
  box-shadow:var(--shadow-lg),0 0 0 1px rgba(255,255,255,.06);
  color:#4d4d4d;
}

/* 信任胶囊行（舞台卡下方） */
.trust-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;padding:28px 0 0}
.trust-pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.05);border:1px solid var(--line);
  font-size:13.5px;font-weight:600;color:var(--text);
}
.trust-pill svg{width:15px;height:15px;color:var(--brand-hi)}

/* =========================================================
   以下为首页下载模块样式（与模板一完全一致，1:1 复刻 telegram.org）
   ========================================================= */
.clearfix::before,.clearfix::after{content:" ";display:table}
.clearfix::after{clear:both}

/* ---- Logo 区（tl_main_logo_wrap：精灵动画 logo + 字标 + 标语，尺寸/间距同官网） ---- */
.tl_main_logo_wrap{max-width:400px;margin:0 auto;padding:20px 0 20px}
a.tl_main_logo{display:block;line-height:0;text-decoration:none!important}
div.tl_main_logo{display:block;width:144px;height:144px;margin:-8px auto;animation:500ms steps(30) both;background-repeat:no-repeat;background-size:cover}
div.tl_main_logo.play{animation-name:t-logo-play}
@keyframes t-logo-play{from{background-position:0% 0%}to{background-position:100% 0%}}
.tl_main_logo_title_image{display:block;width:144px;height:36px;margin:18px auto 6px}
.tl_main_logo_lead{
  font-size:20px;line-height:148%;max-width:285px;margin:0 auto;color:#8c8c8c;
  text-align:center;padding:1px 0 10px;
  font-family:"HelveticaNeue-Light","Helvetica Neue Light","Helvetica Light",Helvetica,Arial,Verdana,sans-serif;font-weight:300;
}

/* ---- 下载瓦片区（tl_main_download_mobile：悬停播放演示视频 + 蓝色下划线动效） ---- */
.tl_main_download_mobile{text-align:center;max-width:1028px;margin:0 auto}
.tl_main_download_link{text-align:center;display:inline-block;height:300px;padding-top:262px;padding-bottom:20px;margin:40px 0;font-size:15px;line-height:18px;max-width:100%;position:relative;color:#0088cc}
a.tl_main_download_link:hover{text-decoration:none}
a.tl_main_download_link:after{
  display:block;height:3px;background:#179cde;position:absolute;border-radius:2px;content:"";left:4px;right:4px;opacity:0;bottom:-1px;
  transition:opacity .2s ease-in-out,transform .2s ease-in-out;transform-origin:bottom;transform:scaleX(.3) scaleY(0);
}
a.tl_main_download_link:hover:after{opacity:1;transform:scaleX(1) scaleY(1)}
.tl_main_download_link_android{width:28.210116857923%;min-width:245px}
.tl_main_download_link_ios{width:42.9961%;min-width:350px}
.tl_main_download_link_tdesktop{display:none;min-width:320px;background:url("../img/SiteTDesktop.webp") 50% 0 no-repeat}
.tl_main_download_image__ios,.tl_main_download_image__android{display:block;position:absolute;top:50%;left:50%;transform-origin:50% 50%;opacity:1;pointer-events:none;transition:opacity .1s ease-in-out;padding:0;border:0}
.tl_main_download_image__ios{margin:-150px 0 0 -152px;width:304px;height:240px;background:url("../img/SiteiOS.webp") 50% 0 no-repeat}
.tl_main_download_image__android{margin:-150px 0 0 -152px;width:304px;height:240px;background:url("../img/SiteAndroid.webp") 50% 0 no-repeat}
.tl_main_video_player{display:block;position:absolute;top:50%;left:50%;transform-origin:50% 50%;opacity:0;pointer-events:none;transition:opacity .1s ease-in-out;padding:0;border:0}
.tl_main_video_player.video__init_retina{display:none}
.tl_main_video_player__android{margin:-150px 0 0 -96px;width:192px;height:240px}
.tl_main_video_player__ios{margin:-150px 0 0 -152px;width:304px;height:240px}
.video_play .tl_main_video_player{opacity:1}
.tl_main_download_more_btn{
  font-weight:normal;text-align:center;vertical-align:middle;cursor:pointer;border:0;white-space:nowrap;
  padding:10px 22px;font-size:15px;line-height:1.33;user-select:none;
  color:#FFF;background-color:#318fd3;margin-top:5px;display:none;border-radius:999px;
}
.tl_main_download_more_btn:hover{color:#FFF}
.icon-arrow-more{display:inline-block;vertical-align:baseline;width:6px;height:11px;background:url("../img/tl_arrow.png") 0 0 no-repeat;margin-left:10px}

/* 抵消舞台卡左右内边距（24px）：使桌面下载区宽度与模板一 hero-inner 内容宽一致（1440 下 1092px） */
.stage-card .tl_main_download_desktop_section{margin-left:-24px;margin-right:-24px}

/* ---- 桌面下载区块（tl_main_download_desktop_section，>640px 显示） ---- */
.tl_main_download_desktop_header{text-align:center}
.tl_main_download_desktop_wrap1{height:291px;overflow:hidden}
.tl_main_download_desktop_wrap{position:absolute;left:0;right:0}
.tl_main_download_desktop{position:absolute;left:0;right:0;min-width:804px;background:url("../img/SiteDesktop.webp") 50% 19px no-repeat}
.tl_main_download_desktop_links{width:595px;margin:0 auto}
.tl_main_download_desktop_link{
  text-align:center;display:inline-block;padding:270px 0 20px;font-size:15px;line-height:18px;vertical-align:top;
  transition:box-shadow .2s ease-in-out;position:relative;float:left;color:#0088cc;
}
a.tl_main_download_desktop_link:hover{text-decoration:none}
a.tl_main_download_desktop_link:after{
  display:block;height:3px;background:#179cde;position:absolute;border-radius:2px;content:"";left:4px;right:4px;opacity:0;bottom:-1px;
  transition:opacity .2s ease-in-out,transform .2s ease-in-out;transform-origin:bottom;transform:scaleX(.3) scaleY(0);
}
a.tl_main_download_desktop_link:hover:after{opacity:1;transform:scaleX(1) scaleY(1)}
.tl_main_download_link_td{width:52%;padding-left:20px;padding-right:20px}
.tl_main_download_link_osx{width:48%}

/* ---- 平台图标（官网 theme 版：mask + currentColor，随链接蓝色） ---- */
.icon-android,.icon-ios{display:inline-block;vertical-align:text-top;width:25px;height:27px;margin-right:10px;margin-top:-6px;background:none;background-color:currentColor;-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-position:0 0;mask-position:0 0}
.tl_main_download_link .icon-android{-webkit-mask-image:url("../img/SiteIconAndroid.svg");mask-image:url("../img/SiteIconAndroid.svg");-webkit-mask-size:22px 27px;mask-size:22px 27px}
.tl_main_download_link .icon-ios{-webkit-mask-image:url("../img/SiteIconApple.svg");mask-image:url("../img/SiteIconApple.svg");-webkit-mask-size:21px 27px;mask-size:21px 27px}

/* ---- ≤640px 移动端（官网同款规则；舞台卡同步全宽，保证瓦片宽度与官网一致） ---- */
@media (max-width:640px){
  .stage-card{margin:0 -24px;border-radius:0;padding-left:0;padding-right:0}
  .tl_main_download_mobile{padding:0 20px}
  .tl_main_download_link{width:auto;min-width:0;display:block;margin-top:20px;margin-bottom:30px}
  a.tl_main_download_link:after{display:none}
  .tl_main_download_link_ios{padding-top:210px;height:245px;padding-bottom:15px}
  .tl_main_download_image__ios{margin:-123px 0 0 -121px;background-size:360px 220px;width:248px;height:198px}
  .tl_main_video_player__ios{margin:-124px 0 0 -121px;width:248px;height:198px}
  .tl_main_download_link_tdesktop{display:block;padding-top:156px;height:188px}
  .tl_main_download_desktop_section,.tl_main_download_desktop_wrap1{display:none}
  .tl_main_download_more_btn{display:inline-block}
}

/* ---- ≤480px 移动端（官网同款规则：logo 缩小 + 标语缩小） ---- */
@media (max-width:480px){
  .tl_main_logo_wrap{padding-top:10px;padding-bottom:2px}
  div.tl_main_logo{width:100px!important;height:100px!important;margin:-5px auto}
  .tl_main_logo_lead{font-size:16px;max-width:224px}
}

/* ---- Retina 2x 素材（官网媒体查询） ---- */
@media only screen and (-webkit-min-device-pixel-ratio:1.5),only screen and (-o-min-device-pixel-ratio:3/2),only screen and (min--moz-device-pixel-ratio:1.5),only screen and (min-device-pixel-ratio:1.5){
  .icon-arrow-more{background-image:url("../img/tl_arrow_2x.png");background-size:6px 11px}
  .tl_main_download_desktop{background-image:url("../img/SiteDesktop_2x.webp");background-size:1246px 260px}
  .tl_main_download_image__android{background-image:url("../img/SiteAndroid_2x.webp");background-size:290px 270px}
  .tl_main_download_image__ios{background-image:url("../img/SiteiOS_2x.webp");background-size:442px 270px}
  .tl_main_download_link_tdesktop{background-image:url("../img/SiteTDesktop_2x.webp");background-size:320px 157px}
}

/* ---------- 区块头（本站差异化：左标题 + 右说明的双栏布局） ---------- */
.sec-head{
  display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);
  gap:18px 56px;align-items:end;margin-bottom:46px;
}
.sec-head h2{font-size:clamp(1.55rem,2.8vw,2.1rem);margin-top:16px}
.sec-head-side{font-size:15.5px;line-height:1.85;color:var(--muted);padding-bottom:5px}

/* ---------- 功能行列表（差异化：行式排版取代卡片网格） ---------- */
.feat-list{display:grid;border-top:1px solid var(--line)}
.feat-row{
  display:flex;align-items:center;gap:20px;
  padding:22px 14px;border-bottom:1px solid var(--line);
  transition:background .18s ease;
}
.feat-row:hover{background:linear-gradient(90deg,rgba(42,171,238,.09),rgba(42,171,238,.015) 62%,transparent)}
.feat-row-icon{
  width:46px;height:46px;border-radius:14px;flex-shrink:0;
  background:var(--brand-soft);color:#5FBBE8;
  display:flex;align-items:center;justify-content:center;
}
.feat-row-icon svg{width:22px;height:22px}
.feat-row-body{flex:1;min-width:0}
.feat-row-body strong{display:block;font-size:16.5px;color:var(--ink);font-weight:700;letter-spacing:-.01em}
.feat-row-body em{display:block;font-style:normal;font-size:14.3px;color:var(--muted);margin-top:5px;line-height:1.7}
.feat-row-go{display:flex;color:var(--faint);transition:transform .18s ease,color .18s ease}
.feat-row-go svg{width:18px;height:18px}
.feat-row:hover .feat-row-go{transform:translateX(4px);color:var(--brand-hi)}

/* ---------- 三步上手（差异化：横排编号步骤） ---------- */
.flow-h{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.flow-h-item{
  position:relative;padding:30px 26px;border-radius:var(--r-lg);
  background:var(--panel);border:1px solid var(--line);
  transition:border-color .18s ease,background .18s ease;
}
.flow-h-item:hover{border-color:rgba(42,171,238,.4);background:var(--panel-2)}
.flow-h-num{
  width:36px;height:36px;border-radius:50%;margin-bottom:18px;
  background:var(--brand-soft);color:#8CCBF0;font-weight:800;font-size:15px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid rgba(42,171,238,.35);
}
.flow-h-item h3{font-size:16.5px;margin-bottom:9px}
.flow-h-item p{font-size:14.3px;line-height:1.75;color:var(--muted)}
.flow-h.four{grid-template-columns:repeat(4,1fr)}

/* ---------- 私隐分栏（差异化：深色 Telegram 窗口模型） ---------- */
.secure-split{display:grid;grid-template-columns:1.02fr 1fr;gap:56px;align-items:center}
.secure-copy h2{font-size:clamp(1.5rem,2.6vw,2rem);margin:16px 0 14px}
.secure-copy p{font-size:15.5px;line-height:1.85;color:var(--text)}
.tick-list{display:grid;gap:13px;margin-top:24px}
.tick-list li{display:flex;align-items:center;gap:12px;font-size:15px;font-weight:600;color:#DCE7EF}
.tick-list.cols-2{grid-template-columns:repeat(2,1fr);gap:13px 32px;align-items:start}
.tick{
  width:22px;height:22px;border-radius:50%;flex-shrink:0;
  background:var(--brand-soft);color:#7CC5ED;
  display:inline-flex;align-items:center;justify-content:center;
}
.tick svg{width:12px;height:12px}

/* 深色 Telegram 客户端窗口模型 */
.tg-mock{
  border-radius:var(--r-lg);overflow:hidden;
  background:#0F1923;border:1px solid var(--line-2);
  box-shadow:var(--shadow-lg);
}
.tg-mock-head{
  display:flex;align-items:center;gap:6px;padding:12px 16px;
  background:#17212B;border-bottom:1px solid rgba(255,255,255,.06);
}
.tg-mock-head .dot{width:10px;height:10px;border-radius:50%}
.tg-mock-title{margin-left:8px;font-size:12.5px;font-weight:700;color:var(--muted)}
.tg-row{display:flex;align-items:center;gap:13px;padding:14px 16px;border-bottom:1px solid rgba(255,255,255,.05)}
.tg-row:last-of-type{border-bottom:none}
.tg-row.active{background:rgba(42,171,238,.10)}
.tg-avatar{
  width:40px;height:40px;border-radius:50%;flex-shrink:0;
  background:var(--grad);color:#FFF;font-size:13px;font-weight:800;
  display:inline-flex;align-items:center;justify-content:center;
}
.tg-avatar.v2{background:linear-gradient(160deg,#3A5166,#263849)}
.tg-avatar.v3{background:linear-gradient(160deg,#4A7A9B,#2E5372)}
.tg-row-body{flex:1;min-width:0}
.tg-row-body strong{display:block;font-size:14px;color:var(--ink);font-weight:700}
.tg-row-body em{display:block;font-style:normal;font-size:12.5px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tg-time{font-size:11.5px;color:var(--faint);font-weight:600}
.tg-mock-foot{
  display:flex;align-items:center;gap:8px;padding:11px 16px;
  background:#17212B;border-top:1px solid rgba(255,255,255,.06);
  font-size:12.3px;color:var(--muted);font-weight:600;
}
.tg-mock-foot svg{width:14px;height:14px;color:#7CC5ED}
.tg-mock-foot .pill{margin-left:auto;font-size:11px;padding:3px 10px}

/* ---------- 新闻列表（差异化：行式条目取代封面大卡） ---------- */
.news-list{display:grid;border-top:1px solid var(--line)}
.news-row{
  display:grid;grid-template-columns:112px 88px minmax(0,1fr) 26px;
  gap:18px;align-items:center;
  padding:21px 12px;border-bottom:1px solid var(--line);
  transition:background .18s ease;
}
.news-row:hover{background:rgba(255,255,255,.025)}
.news-row:hover .news-title{color:var(--brand-hi)}
.news-row:hover .news-go{transform:translateX(4px);color:var(--brand-hi)}
.news-date{font-size:13px;color:var(--faint);font-weight:600;font-variant-numeric:tabular-nums}
.news-cat{
  justify-self:start;
  padding:3px 11px;border-radius:var(--r-pill);
  background:var(--brand-soft);color:#8CCBF0;
  font-size:11.5px;font-weight:700;
}
.news-title{font-size:15.5px;font-weight:700;color:#E4EDF4;letter-spacing:-.005em;transition:color .18s ease}
.news-go{display:flex;color:var(--faint);transition:transform .18s ease,color .18s ease}
.news-go svg{width:17px;height:17px}

/* ---------- 手风琴（FAQ，深色版） ---------- */
.accordion{display:grid;gap:10px;max-width:860px;margin:0 auto}
.accordion-item{
  border:1px solid var(--line);border-radius:var(--r-md);
  background:var(--panel);overflow:hidden;
  transition:border-color .2s ease,background .2s ease;
}
.accordion-item:hover{border-color:rgba(42,171,238,.4)}
.accordion-item.open{border-color:rgba(42,171,238,.5);background:var(--panel-2)}
.accordion-head{
  width:100%;display:flex;align-items:center;gap:15px;
  padding:19px 22px;text-align:left;
  font-size:15.8px;font-weight:700;color:var(--ink);
}
.accordion-index{font-size:12.5px;font-weight:800;color:#4E9ECB;flex-shrink:0;width:24px}
.accordion-head>span:nth-child(2){flex:1}
.accordion-icon{position:relative;width:20px;height:20px;flex-shrink:0}
.accordion-icon::before,.accordion-icon::after{
  content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  background:#6FBBE4;border-radius:2px;transition:transform .22s ease,opacity .22s ease;
}
.accordion-icon::before{width:13px;height:2px}
.accordion-icon::after{width:2px;height:13px}
.accordion-item.open .accordion-icon::after{transform:translate(-50%,-50%) scaleY(0);opacity:0}
.accordion-body{max-height:0;overflow:hidden;transition:max-height .28s ease}
.accordion-content{padding:0 22px 21px 61px;font-size:14.8px;line-height:1.85;color:var(--text)}
.accordion-content a{color:var(--link);font-weight:700}
.accordion-content a:hover{color:var(--link-hi)}

/* ---------- 搜索 + 筛选标签（深色版） ---------- */
.search-box{position:relative;max-width:560px;margin:0 auto}
.search-box svg{position:absolute;left:18px;top:50%;transform:translateY(-50%);width:19px;height:19px;color:var(--muted)}
.search-box input{
  width:100%;padding:15px 22px 15px 50px;
  border-radius:var(--r-pill);border:1px solid var(--line-2);
  background:var(--bg-soft);font-size:15px;color:var(--ink);
  outline:none;transition:border-color .18s ease,box-shadow .18s ease,background .18s ease;
}
.search-box input::placeholder{color:var(--faint)}
.search-box input:focus{border-color:var(--brand);background:#0F1A26;box-shadow:0 0 0 4px var(--brand-soft)}
.tabs{display:inline-flex;flex-wrap:wrap;justify-content:center;gap:8px}
.tab{
  padding:9px 20px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.05);border:1px solid var(--line-2);
  font-size:14px;font-weight:700;color:var(--text);
  transition:all .18s ease;
}
.tab:hover{border-color:rgba(42,171,238,.55);color:var(--brand-hi)}
.tab.active{background:var(--brand-soft-2);border-color:transparent;color:#A5D8F7}
.filter-empty{text-align:center;padding:44px 0;color:var(--muted);font-weight:600}
.hidden{display:none !important}

/* ---------- CTA 区块（差异化：深蓝光晕面板） ---------- */
.cta-panel{
  position:relative;overflow:hidden;
  border-radius:var(--r-xl);padding:68px 40px;text-align:center;
  background:
    radial-gradient(720px 320px at 50% -62%,rgba(42,171,238,.42),transparent 64%),
    linear-gradient(180deg,#16283A,#101B27);
  border:1px solid rgba(42,171,238,.26);
  box-shadow:var(--shadow-lg);
}
.cta-panel h2{color:#FFF;font-size:clamp(1.6rem,3vw,2.1rem);position:relative}
.cta-panel p{color:var(--text);max-width:600px;margin:14px auto 0;position:relative;font-size:15.8px}
.cta-actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:32px;position:relative}

/* ---------- 内页页头 ---------- */
.page-hero{position:relative;overflow:hidden;padding:calc(var(--header-h) + 58px) 0 50px}
.page-hero::before{
  content:"";position:absolute;inset:-42% -20% auto;height:560px;pointer-events:none;
  background:
    radial-gradient(560px 300px at 18% 6%,rgba(42,171,238,.15),transparent 68%),
    radial-gradient(640px 340px at 86% 0%,rgba(34,158,217,.12),transparent 70%);
}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{font-size:clamp(1.8rem,3.4vw,2.5rem);margin:18px 0 14px}
.page-hero .lead{max-width:720px}
.breadcrumbs{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:13.5px;color:var(--faint);
}
.breadcrumbs a{color:var(--muted);font-weight:600;transition:color .18s ease}
.breadcrumbs a:hover{color:var(--brand-hi)}
.breadcrumbs .sep{opacity:.5}
.breadcrumbs .cur{color:#8CCBF0;font-weight:700}

/* ---------- 内页锚点子导航（features：sticky 胶囊条） ---------- */
.anchor-nav{
  position:sticky;top:var(--header-h);z-index:40;
  padding:12px 0;
  background:rgba(14,22,33,.9);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.anchor-nav .tabs{display:flex;flex-wrap:nowrap;justify-content:flex-start;gap:8px;overflow-x:auto;scrollbar-width:none}
.anchor-nav .tabs::-webkit-scrollbar{display:none}
.anchor-nav .tab{white-space:nowrap;flex-shrink:0}

/* ---------- 下载页：平台卡片（深色版） ---------- */
.platform-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.platform-card{
  position:relative;display:flex;flex-direction:column;
  padding:30px 30px 26px;border-radius:var(--r-xl);
  background:var(--panel);border:1px solid var(--line);
  transition:border-color .18s ease,background .18s ease,box-shadow .18s ease;
  scroll-margin-top:96px;
}
.platform-card:hover{border-color:rgba(42,171,238,.42);background:var(--panel-2)}
.platform-card.detected{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft),var(--shadow-md)}
.platform-head{display:flex;align-items:center;gap:15px}
.platform-icon{
  width:52px;height:52px;border-radius:15px;flex-shrink:0;
  background:var(--brand-soft);color:#5FBBE8;
  display:flex;align-items:center;justify-content:center;
}
.platform-icon svg{width:26px;height:26px}
.platform-head h3{font-size:18px}
.platform-head .sub{font-size:13px;color:var(--muted);font-weight:600;margin-top:2px}
.platform-meta{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 4px}
.platform-desc{margin-top:14px;font-size:14.5px;line-height:1.8}
.platform-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:auto;padding-top:22px}
.detected-flag{
  position:absolute;top:18px;right:18px;
  display:none;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-pill);
  background:var(--brand-soft-2);color:#A5D8F7;
  font-size:12px;font-weight:800;
}
.detected-flag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand)}
.platform-card.detected .detected-flag{display:inline-flex}
.detect-hint{font-size:13.5px;color:#8CCBF0;font-weight:700}

/* ---------- 说明框（深色版） ---------- */
.note-box{
  display:flex;gap:13px;align-items:flex-start;
  padding:18px 20px;border-radius:var(--r-md);
  background:var(--brand-soft);border:1px solid rgba(42,171,238,.28);
  font-size:14.2px;line-height:1.75;color:var(--text);
}
.note-box svg{width:19px;height:19px;color:#7CC5ED;flex-shrink:0;margin-top:2px}
.narrow{max-width:860px;margin-left:auto;margin-right:auto}

/* ---------- 叙述文本与联系卡片（about） ---------- */
.prose{max-width:780px}
.prose p{font-size:15.6px;line-height:1.92;color:var(--text);margin-top:16px}
.prose p:first-child{margin-top:0}
.prose strong{color:var(--ink)}
.prose-note{font-size:13.4px;color:var(--faint);font-weight:600}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.contact-card{
  display:flex;flex-direction:column;align-items:flex-start;
  padding:28px 26px;border-radius:var(--r-xl);
  background:var(--panel);border:1px solid var(--line);
  transition:border-color .18s ease,background .18s ease;
}
.contact-card:hover{border-color:rgba(42,171,238,.42);background:var(--panel-2)}
.contact-icon{
  width:46px;height:46px;border-radius:14px;margin-bottom:18px;
  background:var(--brand-soft);color:#5FBBE8;
  display:inline-flex;align-items:center;justify-content:center;
}
.contact-icon svg{width:22px;height:22px}
.contact-card h3{font-size:16.5px;margin-bottom:9px}
.contact-card p{font-size:14.3px;line-height:1.78;color:var(--muted);margin-bottom:16px}
.contact-card .link-more{margin-top:auto}

/* ---------- 页脚（深色版） ---------- */
.site-footer{background:#0A121C;border-top:1px solid var(--line);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.55fr 1fr 1fr 1fr;gap:44px}
.footer-brand p{margin:16px 0 20px;font-size:14.2px;line-height:1.8;max-width:300px;color:var(--muted)}
.social-row{display:flex;gap:10px}
.icon-btn{
  width:38px;height:38px;border-radius:50%;
  background:rgba(255,255,255,.05);border:1px solid var(--line-2);color:var(--muted);
  display:inline-flex;align-items:center;justify-content:center;
  transition:all .18s ease;
}
.icon-btn svg{width:17px;height:17px}
.icon-btn:hover{border-color:rgba(42,171,238,.55);color:var(--brand-hi);background:rgba(42,171,238,.1)}
.footer-title{font-size:13px;font-weight:800;color:var(--ink);letter-spacing:.08em;margin-bottom:18px;text-transform:uppercase}
.footer-links{display:grid;gap:11px}
.footer-links a{font-size:14.4px;color:var(--muted);font-weight:600;transition:color .18s ease}
.footer-links a:hover{color:var(--brand-hi)}
.footer-bottom{
  margin-top:52px;padding:22px 0;
  border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
  font-size:13.5px;color:var(--faint);
}
.footer-legal{display:flex;gap:22px}
.footer-legal a{color:var(--faint);font-weight:600;transition:color .18s ease}
.footer-legal a:hover{color:var(--brand-hi)}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
  .secure-split{gap:38px}
  .flow-h.four{grid-template-columns:1fr 1fr}
}
@media(max-width:900px){
  .section{padding:66px 0}
  .sec-head{grid-template-columns:1fr;align-items:start;gap:12px}
  .secure-split{grid-template-columns:1fr}
  .flow-h{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:1fr}
  .flow-h.four{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .stage{padding-top:calc(var(--header-h) + 44px)}
  .page-hero{padding-top:calc(var(--header-h) + 42px)}
}
@media(max-width:640px){
  .lang-btn{padding:4px 10px;font-size:12.5px}
  .brand-tag{display:none}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .cta-panel{padding:48px 24px}
  .accordion-content{padding-left:22px}
  .accordion-head{padding:16px 18px;font-size:15px}
  .platform-actions .btn{flex:1;justify-content:center}
  .news-row{grid-template-columns:minmax(0,1fr) 26px;gap:6px 14px;padding:18px 8px}
  .news-date{grid-row:2;grid-column:1}
  .news-cat{grid-row:2;grid-column:1;justify-self:start;margin-left:110px}
  .news-title{grid-column:1;grid-row:1}
  .news-go{grid-row:1/3;grid-column:2}
  .tick-list.cols-2{grid-template-columns:1fr}
  .feat-row{padding:19px 8px;gap:15px}
  .feat-row-body em{font-size:13.8px}
  .stage-head h1{font-size:1.75rem}
}