:root{
  --bg:#faf7f2;
  --bg-soft:#f3efe8;
  --bg-card:#ffffff;
  --bg-card-2:#f8f5f0;
  --line:rgba(30,41,59,.08);
  --line-2:rgba(30,41,59,.14);
  --text:#1e293b;
  --text-2:#5a6a80;
  --text-3:#8a98ab;
  --accent:#f97316;
  --accent-light:#fb923c;
  --accent-deep:#ea580c;
  --indigo:#4f46e5;
  --indigo-light:#818cf8;
  --r:20px;
  --r-sm:14px;
  --wrap:1200px;
  --shadow:0 12px 40px rgba(30,41,59,.08);
  --shadow-hover:0 20px 50px rgba(30,41,59,.12);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
ul{list-style:none}
svg{width:18px;height:18px;fill:currentColor;flex:none}
::selection{background:rgba(249,115,22,.2)}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 28px}

.btn{display:inline-flex;align-items:center;gap:9px;border-radius:999px;font-weight:600;font-size:15px;padding:12px 24px;border:1px solid transparent;transition:all .22s var(--ease);white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--accent-light),var(--accent));color:#fff;box-shadow:0 8px 24px rgba(249,115,22,.25)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(249,115,22,.35)}
.btn-outline{background:#fff;border-color:var(--line-2);color:var(--text)}
.btn-outline:hover{background:var(--bg-card-2)}
.btn-lg{padding:15px 32px;font-size:16px}

.nav{position:sticky;top:0;z-index:60;background:rgba(250,247,242,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:30px;height:72px}
.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand-logo{width:42px;height:42px;border-radius:12px;flex:none;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent-light),var(--accent-deep));color:#fff;font-size:18px;font-weight:800;box-shadow:0 6px 18px rgba(249,115,22,.3)}
.brand-text{display:flex;flex-direction:column;line-height:1.35}
.brand-text strong{font-size:15.5px}
.brand-text small{font-size:11.5px;color:var(--text-3)}
.nav-links{display:flex;gap:28px;margin-left:auto}
.nav-links a{font-size:14.5px;color:var(--text-3);transition:color .2s}
.nav-links a:hover{color:var(--text)}
.nav-actions{display:flex;align-items:center;gap:16px;flex:none}
.nav-phone{display:flex;align-items:center;gap:7px;font-size:14.5px;color:var(--text-2)}

.hero{padding:80px 0 60px}
.hero-grid{display:grid;gap:60px;grid-template-columns:1.1fr .9fr;align-items:center}
.hero-tag{display:inline-block;font-size:13px;color:var(--accent);border:1px solid rgba(249,115,22,.3);background:rgba(249,115,22,.06);padding:7px 16px;border-radius:999px;margin-bottom:28px}
.hero h1{font-size:clamp(40px,5.2vw,62px);line-height:1.22;font-weight:800}
.hero h1 .line{display:block}
.hero h1 .hl{background:linear-gradient(100deg,var(--accent),var(--accent-light));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-desc{margin-top:28px;font-size:16.5px;color:var(--text-2);max-width:32em;line-height:1.85}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:36px}
.hero-points{display:flex;flex-wrap:wrap;gap:10px 26px;margin-top:30px}
.hero-points span{position:relative;padding-left:24px;font-size:14px;color:var(--text-2)}
.hero-points span::before{content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:700;font-size:13px}

/* 英语技能卡片 */
.english-card{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow);max-width:420px;margin:0 auto}
.english-card-header{padding:18px 22px;background:linear-gradient(135deg,rgba(249,115,22,.06),rgba(79,70,229,.06));border-bottom:1px solid var(--line)}
.english-card-header strong{font-size:16px}
.skill-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:18px}
.skill-item{background:var(--bg-card-2);border-radius:14px;padding:18px 14px;text-align:center}
.skill-icon{font-size:28px;display:block;margin-bottom:8px}
.skill-item strong{display:block;font-size:15px}
.skill-item small{display:block;margin-top:3px;font-size:12px;color:var(--text-3)}

.stats{padding:56px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);text-align:center}
.stat{padding:8px 16px;position:relative}
.stat + .stat::before{content:"";position:absolute;left:0;top:12%;bottom:12%;width:1px;background:linear-gradient(180deg,transparent,var(--line-2),transparent)}
.stat b{display:block;font-size:clamp(32px,4vw,48px);font-weight:800;background:linear-gradient(180deg,var(--accent-light),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat b i{font-style:normal;font-size:.45em;margin-left:2px}
.stat span{display:block;margin-top:8px;font-size:13px;color:var(--text-3)}

.section{padding:90px 0;border-bottom:1px solid var(--line)}
.section-alt{background:var(--bg-soft)}
.sec-label{display:inline-block;font-size:12.5px;color:var(--accent);letter-spacing:.13em;font-weight:700;margin-bottom:16px}
.sec-title{font-size:clamp(28px,3.5vw,42px);font-weight:800;line-height:1.3}

.about-text{margin-top:24px;display:flex;flex-direction:column;gap:14px;max-width:40em}
.about-text p{font-size:15.5px;color:var(--text-2);line-height:1.85}
.about-highlight{margin-top:26px;padding:18px 22px;border-left:3px solid var(--accent);background:linear-gradient(90deg,rgba(249,115,22,.06),transparent);border-radius:0 var(--r-sm) var(--r-sm) 0;font-size:16px;font-style:italic}
.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:32px}
.feature{display:flex;gap:13px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:16px 18px}
.f-icon{font-size:22px}
.feature strong{display:block;font-size:14.5px}
.feature small{display:block;margin-top:4px;font-size:12.5px;color:var(--text-3)}

.method-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.method-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px 24px}
.method-hot{border-color:rgba(249,115,22,.3);background:linear-gradient(165deg,rgba(249,115,22,.05),#fff 55%)}
.m-tag{display:inline-block;font-size:11.5px;border:1px solid var(--line-2);color:var(--text-3);padding:4px 11px;border-radius:999px;margin-bottom:14px}
.m-tag-hot{color:#fff;background:var(--accent);border-color:transparent;font-weight:700}
.method-card h3{font-size:19px;font-weight:700}
.method-card p{margin-top:10px;font-size:14.5px;color:var(--text-2);line-height:1.8}

.section-trial{background:var(--bg-soft)}
.trial-box{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.trial-desc{margin:18px 0 30px;font-size:15.5px;color:var(--text-2);max-width:30em;line-height:1.85}
.trial-right{display:flex;flex-direction:column;gap:12px}
.trial-step{display:flex;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:16px 20px}
.trial-step .num{width:30px;height:30px;border-radius:50%;flex:none;background:var(--accent);color:#fff;font-weight:700;display:grid;place-items:center;font-size:14px}
.trial-step p{font-size:14.5px;color:var(--text-2)}

.faq{margin-top:40px;display:flex;flex-direction:column;gap:12px;max-width:860px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:20px 24px}
.faq summary{cursor:pointer;font-size:16px;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--text-3);font-size:20px}
.faq details[open] summary::after{content:"–";color:var(--accent)}
.faq p{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:14.5px;color:var(--text-2);line-height:1.85}

.contact{background:var(--bg-soft)}
.contact-grid{display:grid;grid-template-columns:1fr .82fr;gap:26px;margin-top:48px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:14px}
.contact-list li,.contact-item{display:flex;gap:18px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px 24px}
.c-icon{font-size:22px}
.contact-item small{display:block;font-size:12.5px;color:var(--text-3)}
.contact-item strong{display:block;font-size:18px;margin-top:4px}

.qr-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px;text-align:center}
.qr-head{display:flex;align-items:center;gap:13px;text-align:left;margin-bottom:22px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.qr-avatar-text{width:44px;height:44px;border-radius:12px;flex:none;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent-light),var(--accent-deep));color:#fff;font-size:18px;font-weight:800}
.qr-head strong{display:block;font-size:15px}
.qr-head small{display:block;font-size:12px;color:var(--text-3);margin-top:2px}
.qr-sub{font-size:12.5px;color:var(--text-3)}

.foot{padding:38px 0}
.foot-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--text-3)}

.floaty{position:fixed;right:26px;bottom:26px;z-index:80;display:flex;flex-direction:column;align-items:flex-end;gap:12px}
.floaty-btn{display:inline-flex;align-items:center;gap:9px;background:linear-gradient(135deg,var(--accent-light),var(--accent));color:#fff;font-weight:600;font-size:15px;padding:14px 26px;border-radius:999px;box-shadow:0 14px 34px rgba(249,115,22,.35)}
.top-btn{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:#fff;border:1px solid var(--line-2);color:var(--text-2);font-size:17px}

@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .english-card{max-width:440px}
  .method-grid{grid-template-columns:1fr 1fr}
  .trial-box{grid-template-columns:1fr;gap:40px}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:720px){
  .wrap{padding:0 20px}
  .nav-links{display:none}
  .nav-phone{display:none}
  .hero{padding:44px 0 30px}
  .hero h1{font-size:clamp(32px,8vw,42px)}
  .hero-cta{flex-direction:column}
  .hero-cta .btn{width:100%;justify-content:center}
  .stats-grid{grid-template-columns:1fr 1fr;gap:28px 10px}
  .stat + .stat::before{display:none}
  .section{padding:56px 0}
  .feature-grid{grid-template-columns:1fr}
  .method-grid{grid-template-columns:1fr}
  .floaty{right:14px;bottom:14px}
  .top-btn{display:none}
}