/* ===== 新彩虹助手 caihongfa.cn ===== */
:root{
  --teal:#3ec9be;
  --teal-dark:#22a89d;
  --coral:#f76d6d;
  --coral-dark:#e85454;
  --ink:#1f2a37;
  --muted:#6b7787;
  --bg:#ffffff;
  --bg-alt:#f4fbfa;
  --card:#ffffff;
  --line:#e6edf0;
  --shadow:0 10px 30px rgba(31,42,55,.08);
  --shadow-lg:0 20px 50px rgba(31,42,55,.14);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1160px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
/* 键盘焦点可见（无障碍） */
:focus-visible{outline:3px solid var(--teal);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}
.container-narrow{max-width:820px}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:700;font-size:16px;line-height:1;
  padding:14px 26px;border-radius:999px;border:none;cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,filter .18s ease;
  white-space:nowrap;
}
.btn .ic{width:20px;height:20px}
.btn-primary{
  background:linear-gradient(135deg,var(--coral) 0%,var(--coral-dark) 100%);
  color:#fff;box-shadow:0 10px 24px rgba(232,84,84,.35);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(232,84,84,.42)}
.btn-lg{padding:17px 34px;font-size:17px}
.btn-sm{padding:9px 18px;font-size:14px}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;gap:22px;height:70px}
.brand{display:flex;align-items:center;gap:11px}
.brand-logo{border-radius:11px;box-shadow:0 4px 12px rgba(62,201,190,.35)}
.brand-text{display:flex;flex-direction:column;font-weight:800;font-size:18px;line-height:1.1}
.brand-text em{font-style:normal;font-size:12px;font-weight:600;color:var(--teal-dark);letter-spacing:.5px}
.main-nav{display:flex;gap:26px;margin-left:auto;font-weight:600;color:var(--muted)}
.main-nav a{position:relative;transition:color .18s}
.main-nav a:hover{color:var(--ink)}
.main-nav a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--teal);border-radius:2px;transition:width .22s}
.main-nav a:hover::after{width:100%}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px;margin-left:auto}
.nav-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1200px 500px at 85% -10%,rgba(62,201,190,.16),transparent 60%),
  radial-gradient(900px 500px at 0% 110%,rgba(247,109,109,.12),transparent 55%),
  linear-gradient(180deg,#ffffff,#f6fdfc)}
.hero-inner{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:48px;align-items:center;padding:64px 22px 78px}
.hero-copy{min-width:0;max-width:100%}
.badge{display:inline-block;background:rgba(62,201,190,.12);color:var(--teal-dark);font-weight:700;font-size:13px;padding:7px 15px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:clamp(30px,5vw,46px);line-height:1.15;font-weight:900;letter-spacing:-.5px}
.grad{background:linear-gradient(120deg,var(--teal-dark),var(--coral));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{margin:18px 0 26px;color:var(--muted);font-size:17px;max-width:560px}

/* ===== Register / Service card ===== */
.reg-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-lg);padding:26px;position:relative;overflow:hidden;
  min-width:0;max-width:100%;
}
.reg-card::before{content:"";position:absolute;inset:0 0 auto 0;height:5px;background:linear-gradient(90deg,var(--teal),var(--coral))}
.reg-head h2{font-size:22px;font-weight:800}
.reg-tip{color:var(--muted);font-size:14px;margin-top:6px}
.reg-tip b{color:var(--coral-dark)}
.reg-body{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
.reg-step{display:flex;gap:12px;align-items:flex-start;background:var(--bg-alt);border-radius:var(--radius-sm);padding:14px}
.step-no{flex:none;width:28px;height:28px;border-radius:50%;background:var(--teal);color:#fff;font-weight:800;display:grid;place-items:center;font-size:15px}
.reg-step h3{font-size:15px;font-weight:700}
.reg-step p{font-size:13px;color:var(--muted);margin-top:2px}

.service-list{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:20px}
.service-list.inline{margin-bottom:0}
.service-label{font-weight:700;font-size:15px}
.copy-chip{
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;
  background:linear-gradient(135deg,rgba(62,201,190,.12),rgba(247,109,109,.12));
  border:1.5px dashed var(--teal);color:var(--ink);
  padding:10px 16px;border-radius:999px;font-weight:800;font-size:16px;letter-spacing:.5px;
  transition:transform .15s ease,border-color .15s,background .15s;
}
.copy-chip .ic{width:18px;height:18px;color:var(--teal-dark)}
.copy-chip:hover{transform:translateY(-2px);border-color:var(--coral);border-style:solid;background:linear-gradient(135deg,rgba(62,201,190,.2),rgba(247,109,109,.2))}
.copy-chip .chip-hint{font-size:12px;font-weight:700;color:var(--coral-dark);background:rgba(247,109,109,.14);padding:3px 9px;border-radius:999px}
.copy-chip.copied{border-style:solid;border-color:var(--teal-dark);background:rgba(62,201,190,.2)}
.copy-chip.copied .chip-hint{color:#fff;background:var(--teal-dark)}
.copy-chip.mini{padding:7px 12px;font-size:13px}

.download-btn{width:100%}
.hero-meta{display:flex;gap:22px;flex-wrap:wrap;margin-top:20px;color:var(--muted);font-weight:600;font-size:14px}
.hero-meta span{color:var(--teal-dark)}

/* ===== Hero visual / phone ===== */
.hero-visual{position:relative;display:grid;place-items:center;min-height:420px}
.phone{position:relative;z-index:2;width:230px;height:440px;background:#0f1720;border-radius:38px;padding:12px;box-shadow:0 30px 60px rgba(15,23,32,.35)}
.phone-notch{position:absolute;top:12px;left:50%;transform:translateX(-50%);width:110px;height:24px;background:#0f1720;border-radius:0 0 16px 16px;z-index:3}
.phone-screen{width:100%;height:100%;border-radius:28px;overflow:hidden;background:#f4f6fa}
.phone-shot{width:100%;height:100%;object-fit:cover;object-position:top center;display:block}
.glow{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;z-index:1}
.glow-a{width:220px;height:220px;background:var(--teal);top:20px;left:10%}
.glow-b{width:200px;height:200px;background:var(--coral);bottom:20px;right:10%}

/* ===== Sections ===== */
.section{padding:76px 0}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;max-width:640px;margin:0 auto 44px}
.section-head h2{font-size:clamp(26px,3.6vw,34px);font-weight:900;letter-spacing:-.5px}
.section-head p{color:var(--muted);margin-top:12px;font-size:16px}

/* ===== Features ===== */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.feature-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 22px;box-shadow:var(--shadow);transition:transform .2s ease,box-shadow .2s ease}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.feature-ico{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;font-size:26px;background:linear-gradient(135deg,rgba(62,201,190,.16),rgba(247,109,109,.16));margin-bottom:16px}
.feature-card h3{font-size:18px;font-weight:800;margin-bottom:8px}
.feature-card p{color:var(--muted);font-size:15px}

/* ===== Tabs / install ===== */
.tabs{max-width:860px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.tab-bar{display:flex;border-bottom:1px solid var(--line)}
.tab-btn{flex:1;padding:18px;font-size:16px;font-weight:800;background:none;border:none;cursor:pointer;color:var(--muted);position:relative;transition:color .18s,background .18s}
.tab-btn.active{color:var(--ink);background:var(--bg-alt)}
.tab-btn.active::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:3px;background:linear-gradient(90deg,var(--teal),var(--coral))}
.tab-panel{display:none;padding:28px}
.tab-panel.active{display:block;animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.panel-note{background:rgba(62,201,190,.08);border-left:4px solid var(--teal);padding:12px 16px;border-radius:8px;margin-bottom:18px}
.panel-note b{color:var(--coral-dark)}
.steps{margin:0 0 16px 4px;padding-left:20px}
.steps li{margin:9px 0;padding-left:6px}
.warn{color:var(--coral-dark);font-weight:600;background:rgba(247,109,109,.08);padding:12px 16px;border-radius:8px}
.install-service{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:18px 28px;background:var(--bg-alt);border-top:1px solid var(--line);font-weight:700}
.install-service .copy-chip{background:#fff}

/* ===== Update ===== */
.update-wrap{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.update-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);position:relative}
.update-card h3{font-size:20px;font-weight:800;margin-bottom:16px}
.tag-latest{position:absolute;top:22px;right:22px;background:linear-gradient(135deg,var(--teal),var(--teal-dark));color:#fff;font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px}
.check-list{list-style:none}
.check-list li{position:relative;padding-left:30px;margin:11px 0;color:var(--ink)}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:50%;background:rgba(62,201,190,.16);color:var(--teal-dark);font-weight:900;display:grid;place-items:center;font-size:13px}
.muted{color:var(--muted);font-size:14px;margin-top:14px}

/* ===== FAQ ===== */
.faq-list{display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;transition:box-shadow .2s}
.faq-item[open]{box-shadow:var(--shadow)}
.faq-item summary{cursor:pointer;list-style:none;padding:18px 20px;font-weight:700;font-size:16px;display:flex;align-items:center;justify-content:space-between;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;color:var(--teal-dark);font-weight:700;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 20px 18px;color:var(--muted)}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.contact-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.contact-card h3{font-size:18px;font-weight:800;margin-bottom:10px}
.contact-card .check-list li{font-size:14px}

/* ===== Footer ===== */
.site-footer{background:#12211f;color:#cdd8d6;padding:44px 0 96px}
.footer-inner{display:flex;flex-direction:column;gap:18px;align-items:center;text-align:center}
.foot-brand{display:flex;align-items:center;gap:12px}
.foot-brand img{border-radius:10px}
.foot-brand strong{display:block;font-size:17px;color:#fff}
.foot-brand span{font-size:13px;color:#8fa3a0}
.foot-nav{display:flex;gap:24px;flex-wrap:wrap;justify-content:center}
.foot-nav a{color:#a9b8b6;font-weight:600;transition:color .18s}
.foot-nav a:hover{color:#fff}
.copyright{font-size:13px;color:#6f817e;border-top:1px solid rgba(255,255,255,.08);padding-top:18px;width:100%}

/* ===== Mobile bar ===== */
.mobile-bar{position:fixed;left:0;right:0;bottom:0;z-index:120;display:none;align-items:center;gap:12px;padding:10px 14px;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-top:1px solid var(--line);box-shadow:0 -6px 20px rgba(0,0,0,.06)}
.mb-service{display:flex;align-items:center;gap:8px;font-weight:700;font-size:13px;color:var(--muted)}
.mb-service .copy-chip{background:var(--bg-alt)}
.mb-dl{flex:1}

/* ===== Toast ===== */
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);z-index:200;background:var(--ink);color:#fff;font-weight:600;padding:13px 22px;border-radius:999px;box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;width:max-content;max-width:calc(100vw - 32px);text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ===== 返回顶部 ===== */
.to-top{position:fixed;right:18px;bottom:88px;z-index:130;width:46px;height:46px;border-radius:50%;border:none;background:linear-gradient(135deg,var(--teal),var(--teal-dark));color:#fff;font-size:20px;font-weight:800;cursor:pointer;box-shadow:0 8px 20px rgba(34,168,157,.4);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .25s,transform .25s,visibility .25s}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{transform:translateY(-3px)}
@media(min-width:769px){.to-top{bottom:26px}}

/* ===== Responsive ===== */
@media(max-width:960px){
  .hero-inner{display:flex;flex-direction:column;gap:26px;padding:30px 18px 54px}
  .hero-copy{display:flex;flex-direction:column}
  .hero-copy .reg-card{order:1}
  .hero-copy .badge{order:2;margin-top:6px}
  .hero-copy h1{order:3;font-size:clamp(26px,7vw,36px)}
  .hero-copy .lead{order:4;margin:12px 0 4px;font-size:16px}
  .hero-copy .hero-meta{order:5;margin-top:16px}
  .hero-visual{order:2;min-height:auto}
  .phone{width:212px;height:404px}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .update-wrap{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav,.nav-cta{display:none}
  .nav-toggle{display:flex}
  .main-nav.open{display:flex;position:absolute;top:70px;left:0;right:0;flex-direction:column;background:#fff;border-bottom:1px solid var(--line);padding:14px 22px;gap:14px;margin:0;box-shadow:var(--shadow)}
  .mobile-bar{display:flex}
  body{padding-bottom:0}
  .reg-body{grid-template-columns:1fr}
  .section{padding:56px 0}
  /* 手机端注册/客服卡片优化 */
  .reg-card{padding:20px}
  .reg-head h2{font-size:20px}
  .service-list{gap:10px}
  .service-label{flex-basis:100%;margin-bottom:2px}
  .service-list .copy-chip{flex:1 1 auto;justify-content:space-between;width:auto;min-width:150px}
  .copy-chip .chip-text{font-size:17px}
  .hero-meta{gap:14px}
  .contact-grid,.update-wrap{gap:16px}
}
@media(max-width:520px){
  .feature-grid{grid-template-columns:1fr}
  .copy-chip{font-size:15px}
  .tab-bar{flex-direction:column}
  .tab-btn.active::after{display:none}
}
@media(max-width:400px){
  .btn{white-space:normal}
  .download-btn{font-size:16px;padding:15px 18px}
  .reg-body{gap:12px}
}
/* ===== 动效降级（无障碍） ===== */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}