/* 小蓝APP官网 - xlo.mom */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a8cff;
  --primary-dark:#0d6fd4;
  --accent:#ff6b35;
  --text:#1a1a2e;
  --text-light:#5a6270;
  --bg:#f5f8fc;
  --white:#fff;
  --border:#e2e8f0;
  --shadow:0 4px 24px rgba(26,140,255,.1);
  --radius:12px;
  --max:1200px;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.75}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--white);box-shadow:0 1px 8px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:var(--max);margin:0 auto}
.logo-link{display:flex;align-items:center;gap:12px}
.logo-link img{width:44px;height:44px;border-radius:10px}
.logo-text{font-size:1.25rem;font-weight:700;color:var(--text)}
.logo-text span{color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}
.main-nav ul{display:flex;gap:8px;list-style:none}
.main-nav a{display:block;padding:8px 16px;border-radius:8px;color:var(--text);font-size:.95rem;font-weight:500}
.main-nav a:hover,.main-nav a.active{background:rgba(26,140,255,.1);color:var(--primary)}

/* Hero */
.hero{background:linear-gradient(135deg,#1a8cff 0%,#0d6fd4 50%,#0052a3 100%);color:var(--white);padding:60px 20px 80px;text-align:center}
.hero h1{font-size:clamp(1.6rem,4vw,2.4rem);margin-bottom:16px;line-height:1.3}
.hero-desc{font-size:1.05rem;opacity:.92;max-width:720px;margin:0 auto 28px}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;border-radius:50px;font-weight:600;font-size:1rem;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--white);color:var(--primary);box-shadow:0 4px 16px rgba(0,0,0,.15)}
.btn-outline{background:transparent;color:var(--white);border:2px solid rgba(255,255,255,.7)}
.btn-accent{background:var(--accent);color:var(--white)}

/* Sections */
section{padding:60px 0}
.section-title{text-align:center;margin-bottom:12px;font-size:clamp(1.4rem,3vw,1.9rem)}
.section-sub{text-align:center;color:var(--text-light);margin-bottom:40px;max-width:640px;margin-left:auto;margin-right:auto}
.bg-white{background:var(--white)}

/* Feature grid */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px}
.feature-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s}
.feature-card:hover{transform:translateY(-4px)}
.feature-card img{width:100%;aspect-ratio:9/16;object-fit:cover;object-position:top}
.feature-card-body{padding:20px}
.feature-card h3{font-size:1.1rem;margin-bottom:8px;color:var(--text)}
.feature-card p{color:var(--text-light);font-size:.92rem}

/* Content blocks */
.content-block{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:48px}
.content-block.reverse .content-text{order:2}
.content-block.reverse .content-img{order:1}
.content-text h2{font-size:1.5rem;margin-bottom:16px;color:var(--text)}
.content-text p{margin-bottom:12px;color:var(--text-light)}
.content-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.content-img img{width:100%;border-radius:var(--radius)}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;margin-top:32px}
.step-card{background:var(--white);padding:28px 24px;border-radius:var(--radius);text-align:center;box-shadow:var(--shadow);position:relative}
.step-num{width:40px;height:40px;background:var(--primary);color:var(--white);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;margin:0 auto 16px;font-size:1.1rem}
.step-card h3{margin-bottom:8px;font-size:1.05rem}
.step-card p{color:var(--text-light);font-size:.9rem}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--white);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--primary)}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{padding:0 24px 18px;color:var(--text-light);display:none}
.faq-item.open .faq-a{display:block}

/* Article page */
.page-hero{background:linear-gradient(135deg,#1a8cff,#0d6fd4);color:var(--white);padding:48px 20px;text-align:center}
.page-hero h1{font-size:clamp(1.5rem,3.5vw,2rem)}
.article-content{max-width:860px;margin:40px auto;padding:0 20px 60px}
.article-content h2{font-size:1.35rem;margin:32px 0 12px;color:var(--text)}
.article-content h3{font-size:1.1rem;margin:24px 0 8px}
.article-content p,.article-content li{color:var(--text-light);margin-bottom:12px}
.article-content ul,.article-content ol{padding-left:24px;margin-bottom:16px}
.article-content img{border-radius:var(--radius);margin:24px auto;box-shadow:var(--shadow);max-width:360px}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.88rem;color:var(--text-light)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

/* Internal links box */
.link-box{background:rgba(26,140,255,.06);border-left:4px solid var(--primary);padding:20px 24px;border-radius:0 var(--radius) var(--radius) 0;margin:24px 0}
.link-box h3{font-size:1rem;margin-bottom:10px}
.link-box ul{list-style:none;padding:0}
.link-box li{margin-bottom:6px}
.link-box a{font-weight:500}

/* Gallery strip */
.gallery-strip{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px;margin:32px 0}
.gallery-strip img{border-radius:var(--radius);box-shadow:var(--shadow);aspect-ratio:9/16;object-fit:cover;object-position:top}

/* Footer */
.site-footer{background:#0f1a2e;color:rgba(255,255,255,.75);padding:48px 20px 24px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;max-width:var(--max);margin:0 auto 32px}
.footer-grid h4{color:var(--white);margin-bottom:14px;font-size:1rem}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:8px}
.footer-grid a{color:rgba(255,255,255,.65);font-size:.9rem}
.footer-grid a:hover{color:var(--white)}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);font-size:.85rem;max-width:var(--max);margin:0 auto}

/* Error pages */
.error-page{min-height:70vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:40px 20px}
.error-page h1{font-size:5rem;color:var(--primary);line-height:1}
.error-page h2{margin:16px 0;font-size:1.5rem}
.error-page p{color:var(--text-light);margin-bottom:24px}

/* Mobile */
@media(max-width:768px){
  .nav-toggle{display:block}
  .main-nav{position:absolute;top:100%;left:0;right:0;background:var(--white);box-shadow:0 8px 24px rgba(0,0,0,.1);display:none;padding:12px}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column}
  .content-block{grid-template-columns:1fr}
  .content-block.reverse .content-text,.content-block.reverse .content-img{order:unset}
  .hero{padding:40px 20px 60px}
  section{padding:40px 0}
  .feature-card img{aspect-ratio:9/14}
}