/* 易歪歪官网 - 全局样式 */
*,*::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",sans-serif;font-size:16px;line-height:1.6;color:#1e293b;background:#fff}
img,svg{display:block;max-width:100%;height:auto}
a{color:#2563eb;text-decoration:none;transition:color .2s}
a:hover{color:#1d4ed8}
ul{list-style:none}

:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --cta:#f97316;
  --cta-dark:#ea580c;
  --bg-light:#f8fafc;
  --bg-section:#f1f5f9;
  --text:#1e293b;
  --text-muted:#64748b;
  --border:#e2e8f0;
  --radius:12px;
  --shadow:0 4px 24px rgba(15,23,42,.08);
  --max-w:1140px;
  --header-h:64px;
}

.skip-link{position:absolute;top:-100%;left:16px;z-index:9999;padding:8px 16px;background:var(--primary);color:#fff;border-radius:0 0 8px 8px;font-weight:600}
.skip-link:focus{top:0;outline:2px solid #fff;outline-offset:2px}

.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);height:var(--header-h)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:#4d6faf;line-height:1}
.logo:hover{color:#587ab9}
.logo img{width:30px;height:30px;flex-shrink:0}

.nav-desktop{display:flex;align-items:center;gap:28px}
.nav-desktop a{color:var(--text);font-weight:500;font-size:.95rem}
.nav-desktop a:hover,.nav-desktop a.active{color:var(--primary)}

.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;color:var(--text)}
.nav-toggle:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;font-size:1rem;font-weight:600;border-radius:8px;border:none;cursor:pointer;transition:background .2s,transform .2s,box-shadow .2s;text-align:center}
.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.btn-primary{background:var(--cta);color:#fff;box-shadow:0 4px 14px rgba(249,115,22,.35)}
.btn-primary:hover{background:var(--cta-dark);color:#fff;transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-sm{padding:8px 20px;font-size:.9rem}

/* Hero */
.hero{padding:72px 0 80px;background:linear-gradient(160deg,#eff6ff 0%,#fff 50%,#f8fafc 100%);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.hero-content{text-align:center;display:flex;flex-direction:column;align-items:center}
.hero-badge{display:inline-block;padding:6px 14px;background:#dbeafe;color:var(--primary);border-radius:20px;font-size:.85rem;font-weight:600;margin-bottom:16px}
.hero h1{font-size:clamp(1.8rem,4vw,2.75rem);line-height:1.25;font-weight:800;color:#0f172a;margin-bottom:16px}
.hero-sub{font-size:1.15rem;color:var(--text-muted);margin-bottom:12px}
.hero-platforms{font-size:.95rem;color:var(--text-muted);margin-bottom:28px;line-height:1.8;max-width:420px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:4px}
.hero-visual{border-radius:var(--radius);overflow:visible;position:relative}
.hero-visual img{border-radius:var(--radius);box-shadow:var(--shadow);animation:hero-float 5s ease-in-out infinite}
@keyframes hero-float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}

.preview-showcase{max-width:960px;margin:0 auto;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#fff}
.preview-showcase img{width:100%;height:auto;display:block}

.section{padding:72px 0}
.section-alt{background:var(--bg-light)}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:700;color:#0f172a;margin-bottom:12px}
.section-header p{color:var(--text-muted);max-width:560px;margin:0 auto;font-size:1.05rem}

/* Features grid */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;text-align:center;transition:box-shadow .2s,transform .2s}
.feature-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.feature-icon{width:56px;height:56px;margin:0 auto 16px;background:#eff6ff;border-radius:14px;display:flex;align-items:center;justify-content:center;color:var(--primary)}
.feature-card h3{font-size:1.05rem;font-weight:700;margin-bottom:8px;color:#0f172a}
.feature-card p{font-size:.9rem;color:var(--text-muted);line-height:1.65}

/* Zigzag */
.zigzag-item{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:64px}
.zigzag-item:last-child{margin-bottom:0}
.zigzag-item.reverse .zigzag-text{order:2}
.zigzag-item.reverse .zigzag-img{order:1}
.zigzag-text h2{font-size:clamp(1.3rem,2.5vw,1.75rem);font-weight:700;color:#0f172a;margin-bottom:14px}
.zigzag-text p{color:var(--text-muted);margin-bottom:10px;line-height:1.75}
.zigzag-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:linear-gradient(135deg,#f8fafc,#eff6ff)}
.zigzag-img img{transition:transform .4s ease}
.zigzag-item:hover .zigzag-img img{transform:scale(1.02)}

/* CTA banner */
.cta-banner{background:linear-gradient(135deg,var(--primary) 0%,#1e40af 100%);border-radius:var(--radius);padding:48px 40px;text-align:center;color:#fff;margin-top:16px}
.cta-banner h2{font-size:1.5rem;margin-bottom:12px}
.cta-banner p{opacity:.9;margin-bottom:24px;max-width:520px;margin-left:auto;margin-right:auto}
.cta-banner .btn-primary{background:#fff;color:var(--primary);box-shadow:none}
.cta-banner .btn-primary:hover{background:#f1f5f9;color:var(--primary-dark)}

/* Download page */
.page-hero{padding:56px 0 40px;background:var(--bg-light);text-align:center}
.page-hero h1{font-size:clamp(1.6rem,3vw,2.25rem);font-weight:800;color:#0f172a;margin-bottom:12px}
.page-hero p{color:var(--text-muted);max-width:560px;margin:0 auto}

.download-card{max-width:640px;margin:0 auto;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:40px;text-align:center;box-shadow:var(--shadow)}
.download-card .btn{margin:8px 0 20px}
.download-meta{font-size:.9rem;color:var(--text-muted);line-height:1.8}
.download-meta strong{color:var(--text)}
.download-alt{margin-top:32px;padding-top:24px;border-top:1px solid var(--border);font-size:.9rem;color:var(--text-muted)}
.download-alt a{font-weight:600}

.platform-section-title{text-align:center;font-size:1.25rem;font-weight:700;color:#0f172a;margin:48px 0 24px}
.download-platforms{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:40px}
.platform-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;text-align:center;transition:box-shadow .2s,transform .2s}
.platform-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.platform-icon{width:56px;height:56px;margin:0 auto 16px;background:#eff6ff;border-radius:14px;display:flex;align-items:center;justify-content:center;color:var(--primary)}
.platform-icon-ios{background:#f5f3ff;color:#7c3aed}
.platform-icon-android{background:#f0fdf4;color:#16a34a}
.platform-card h3{font-size:1.05rem;font-weight:700;color:#0f172a;margin-bottom:8px}
.platform-card p{font-size:.9rem;color:var(--text-muted);line-height:1.65;margin-bottom:16px;min-height:2.8em}
.platform-card .btn{margin-bottom:12px}
.platform-meta{font-size:.8rem;color:var(--text-muted);line-height:1.6}

.sys-req{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px}
.sys-req-item{background:var(--bg-light);border-radius:8px;padding:20px;text-align:center}
.sys-req-item h3{font-size:.95rem;font-weight:700;margin-bottom:6px;color:#0f172a}
.sys-req-item p{font-size:.85rem;color:var(--text-muted)}

/* FAQ */
.faq-group{margin-bottom:40px}
.faq-group h2{font-size:1.25rem;font-weight:700;color:#0f172a;margin-bottom:16px;padding-bottom:10px;border-bottom:2px solid var(--primary);display:inline-block}
.faq-list{display:flex;flex-direction:column;gap:10px}
.faq-item{border:1px solid var(--border);border-radius:8px;overflow:hidden;background:#fff}
.faq-item summary{padding:16px 20px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;color:#0f172a;transition:background .2s}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.25rem;color:var(--primary);flex-shrink:0;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item summary:hover{background:var(--bg-light)}
.faq-item summary:focus-visible{outline:2px solid var(--primary);outline-offset:-2px}
.faq-answer{padding:0 20px 16px;color:var(--text-muted);line-height:1.75;font-size:.95rem}

.faq-contact{text-align:center;background:var(--bg-light);border-radius:var(--radius);padding:40px;margin-top:48px}
.faq-contact h2{font-size:1.25rem;margin-bottom:8px;color:#0f172a}
.faq-contact p{color:var(--text-muted);margin-bottom:20px}

/* About */
.about-content{max-width:720px;margin:0 auto}
.about-content h2{font-size:1.25rem;font-weight:700;margin:32px 0 12px;color:#0f172a}
.about-content p{color:var(--text-muted);line-height:1.8;margin-bottom:12px}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:32px}
.contact-card{background:var(--bg-light);border-radius:var(--radius);padding:24px;border:1px solid var(--border)}
.contact-card h3{font-size:1rem;font-weight:700;margin-bottom:8px;color:#0f172a}
.contact-card p{font-size:.9rem;color:var(--text-muted)}

/* Footer */
.site-footer{background:#0f172a;color:#94a3b8;padding:48px 0 24px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand .logo{color:#587fcb;margin-bottom:12px}
.footer-brand .logo:hover{color:#93b4e8}
.footer-brand .logo img{width:24px;height:24px}
.footer-brand p{font-size:.9rem;line-height:1.7;max-width:280px}
.footer-col h4{color:#e2e8f0;font-size:.9rem;font-weight:600;margin-bottom:14px;text-transform:uppercase;letter-spacing:.05em}
.footer-col a{display:block;color:#94a3b8;font-size:.9rem;margin-bottom:8px}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1e293b;padding-top:20px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:.85rem}

.footer-links{border-top:1px solid #1e293b;padding:24px 0;margin-bottom:8px}
.footer-links:has(.friend-links:empty){padding-bottom:16px}
.footer-links h4{color:#e2e8f0;font-size:.9rem;font-weight:600;margin-bottom:0;letter-spacing:.05em}
.footer-links:not(:has(.friend-links:empty)) h4{margin-bottom:14px}
.friend-links{display:flex;flex-wrap:wrap;gap:12px 24px;list-style:none}
.friend-links a{color:#94a3b8;font-size:.9rem;transition:color .2s}
.friend-links a:hover{color:#fff}

/* Mobile nav */
.mobile-nav{display:none;position:fixed;inset:0;top:var(--header-h);background:rgba(15,23,42,.5);z-index:99}
.mobile-nav.open{display:block}
.mobile-nav-panel{background:#fff;width:280px;height:100%;padding:24px;box-shadow:4px 0 24px rgba(0,0,0,.1);transform:translateX(-100%);transition:transform .3s}
.mobile-nav.open .mobile-nav-panel{transform:translateX(0)}
.mobile-nav-panel a{display:block;padding:12px 0;font-weight:500;color:var(--text);border-bottom:1px solid var(--border)}
.mobile-nav-panel a:hover{color:var(--primary)}
.mobile-nav-panel .btn{width:100%;margin-top:16px}

/* Responsive */
@media(max-width:1024px){
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .download-platforms{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-desktop{display:none}
  .nav-toggle{display:block}
  .hero{padding:48px 0 56px}
  .hero-grid,.zigzag-item{grid-template-columns:1fr;gap:32px}
  .zigzag-item.reverse .zigzag-text,.zigzag-item.reverse .zigzag-img{order:unset}
  .features-grid{grid-template-columns:1fr}
  .sys-req{grid-template-columns:1fr}
  .download-platforms{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .section{padding:48px 0}
  .cta-banner{padding:32px 24px}
  .download-card{padding:28px 20px}
}