/* 全局重置与基础 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;background:#f0f2f5;color:#1a1a2e;line-height:1.6;transition:background .3s,color .3s;min-height:100vh}
a{color:#e94560;text-decoration:none;transition:color .3s}
a:hover{color:#c23152}
ul,ol{list-style:none}
img{max-width:100%;display:block}
button{cursor:pointer;border:none;background:transparent;font-size:1rem}
h1,h2,h3{font-weight:700;line-height:1.2}

/* 暗色模式 */
body.dark-mode{background:#0f0f1a;color:#e0e0e0}
body.dark-mode a{color:#ff6b81}
body.dark-mode a:hover{color:#ff4757}
body.dark-mode header{background:rgba(15,15,26,.85);backdrop-filter:blur(12px)}
body.dark-mode .sticky{background:rgba(15,15,26,.92)}
body.dark-mode nav ul li a{color:#ccc}
body.dark-mode nav ul li a.active{color:#ff6b81}
body.dark-mode #hero{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 50%,#0f3460 100%)}
body.dark-mode #hero h1{color:#fff}
body.dark-mode #hero p{color:#ccc}
body.dark-mode section:not(#hero){background:rgba(30,30,50,.6);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.05)}
body.dark-mode section h2{color:#ff6b81}
body.dark-mode details summary{background:rgba(40,40,60,.5);color:#ddd}
body.dark-mode details summary:hover{background:rgba(60,60,80,.6)}
body.dark-mode details[open] summary{background:rgba(233,69,96,.2)}
body.dark-mode footer{background:#0a0a15;border-top:1px solid rgba(255,255,255,.05)}
body.dark-mode #backToTop{background:#e94560;color:#fff}
body.dark-mode #backToTop:hover{background:#c23152}

/* 头部导航 */
header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);transition:background .3s,box-shadow .3s;padding:0 1.5rem}
header.sticky{box-shadow:0 4px 20px rgba(0,0,0,.08)}
nav{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;height:64px}
nav div{display:flex;align-items:center;gap:.75rem}
nav div span{font-size:1.4rem;font-weight:800;background:linear-gradient(135deg,#e94560,#0f3460);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
nav ul{display:flex;gap:.25rem}
nav ul li a{padding:.5rem 1rem;border-radius:8px;color:#333;font-weight:500;transition:all .3s;position:relative}
nav ul li a:hover{background:rgba(233,69,96,.08);color:#e94560}
nav ul li a.active{color:#e94560;font-weight:600}
nav ul li a.active::after{content:'';position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:20px;height:3px;background:#e94560;border-radius:2px}
#themeToggle,#menuToggle{font-size:1.3rem;padding:.4rem .6rem;border-radius:8px;transition:background .3s}
#themeToggle:hover,#menuToggle:hover{background:rgba(0,0,0,.05)}
body.dark-mode #themeToggle:hover,body.dark-mode #menuToggle:hover{background:rgba(255,255,255,.1)}
#menuToggle{display:none}
nav input[type="text"]{padding:.4rem .8rem;border:1px solid #ddd;border-radius:20px;font-size:.85rem;outline:none;transition:border .3s,width .3s;width:120px;background:rgba(255,255,255,.6);backdrop-filter:blur(4px)}
nav input[type="text"]:focus{border-color:#e94560;width:160px}
body.dark-mode nav input[type="text"]{background:rgba(40,40,60,.4);border-color:#444;color:#eee}
body.dark-mode nav input[type="text"]:focus{border-color:#ff6b81}

/* Hero区域 */
#hero{min-height:80vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:6rem 1.5rem 4rem;background:linear-gradient(135deg,#667eea 0%,#764ba2 50%,#f093fb 100%);color:#fff;position:relative;overflow:hidden}
#hero::before{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle at 30% 40%,rgba(255,255,255,.08) 0%,transparent 60%);animation:heroGlow 8s ease-in-out infinite alternate}
@keyframes heroGlow{0%{transform:translate(0,0)}100%{transform:translate(10%,10%)}}
#hero h1{font-size:3.2rem;margin-bottom:.75rem;text-shadow:0 4px 20px rgba(0,0,0,.2);letter-spacing:-.5px;position:relative;z-index:1}
#hero p{font-size:1.2rem;max-width:600px;margin-bottom:2rem;opacity:.9;position:relative;z-index:1}
#hero a[role="button"]{display:inline-block;padding:.9rem 2.8rem;background:#fff;color:#764ba2;font-weight:700;border-radius:50px;font-size:1.05rem;transition:all .3s;box-shadow:0 8px 30px rgba(0,0,0,.15);position:relative;z-index:1}
#hero a[role="button"]:hover{transform:translateY(-3px);box-shadow:0 12px 40px rgba(0,0,0,.25);background:#f8f9ff}

/* 通用section样式 */
main{max-width:1200px;margin:0 auto;padding:1rem 1.5rem}
section{padding:2.5rem 2rem;margin:2rem 0;background:rgba(255,255,255,.7);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-radius:20px;border:1px solid rgba(255,255,255,.3);box-shadow:0 8px 32px rgba(0,0,0,.04);transition:transform .4s,box-shadow .4s;opacity:0;transform:translateY(30px);animation:fadeInUp .6s forwards}
section:nth-child(2){animation-delay:.1s}
section:nth-child(3){animation-delay:.2s}
section:nth-child(4){animation-delay:.3s}
section:nth-child(5){animation-delay:.4s}
section:nth-child(6){animation-delay:.5s}
section:nth-child(7){animation-delay:.6s}
section:nth-child(8){animation-delay:.7s}
section:nth-child(9){animation-delay:.8s}
@keyframes fadeInUp{to{opacity:1;transform:translateY(0)}}
section:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,0,0,.08)}
section h2{font-size:2rem;margin-bottom:1.5rem;color:#1a1a2e;position:relative;display:inline-block}
section h2::after{content:'';display:block;width:50px;height:4px;background:linear-gradient(90deg,#e94560,#0f3460);border-radius:2px;margin-top:.5rem}
section p{color:#555;max-width:700px}
body.dark-mode section p{color:#bbb}

/* 关于 */
#about p{margin-bottom:.75rem}

/* 产品卡片 */
#products ul{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;margin-top:1rem}
#products ul li{background:rgba(255,255,255,.5);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:16px;padding:1.8rem 1.5rem;border:1px solid rgba(255,255,255,.4);transition:all .3s;box-shadow:0 4px 16px rgba(0,0,0,.04)}
#products ul li:hover{transform:translateY(-6px);box-shadow:0 8px 30px rgba(0,0,0,.1);border-color:rgba(233,69,96,.2)}
#products ul li h3{font-size:1.3rem;margin-bottom:.6rem;color:#1a1a2e}
#products ul li p{font-size:.95rem;color:#666}
body.dark-mode #products ul li{background:rgba(40,40,60,.3);border-color:rgba(255,255,255,.05)}
body.dark-mode #products ul li h3{color:#e0e0e0}
body.dark-mode #products ul li p{color:#aaa}

/* 服务列表 */
#services ul{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1rem}
#services ul li{background:rgba(233,69,96,.06);padding:1rem 1.2rem;border-radius:12px;font-weight:500;transition:all .3s;border-left:4px solid #e94560}
#services ul li:hover{background:rgba(233,69,96,.12);transform:translateX(4px)}
body.dark-mode #services ul li{background:rgba(233,69,96,.1);color:#ddd}

/* FAQ折叠 */
#faq div{display:flex;flex-direction:column;gap:.6rem;margin-top:1rem}
details{background:rgba(255,255,255,.4);backdrop-filter:blur(4px);border-radius:12px;overflow:hidden;transition:all .3s;border:1px solid rgba(0,0,0,.04)}
details summary{padding:.9rem 1.2rem;font-weight:600;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;transition:background .3s;border-radius:12px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:'+';font-size:1.4rem;color:#e94560;transition:transform .3s;font-weight:300}
details[open] summary::after{content:'−';transform:rotate(180deg)}
details summary:hover{background:rgba(233,69,96,.04)}
details[open] summary{background:rgba(233,69,96,.06);border-radius:12px 12px 0 0}
details p{padding:.8rem 1.2rem 1.2rem;color:#555;font-size:.95rem;line-height:1.7}
body.dark-mode details{background:rgba(40,40,60,.25);border-color:rgba(255,255,255,.03)}
body.dark-mode details p{color:#bbb}

/* 步骤列表 */
#howto ol{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1.2rem;margin-top:1rem;counter-reset:step}
#howto ol li{background:rgba(255,255,255,.5);backdrop-filter:blur(6px);border-radius:16px;padding:1.5rem 1.2rem;border:1px solid rgba(255,255,255,.3);position:relative;transition:all .3s;counter-increment:step}
#howto ol li::before{content:counter(step);position:absolute;top:-10px;left:-10px;width:36px;height:36px;background:linear-gradient(135deg,#e94560,#0f3460);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem;box-shadow:0 4px 12px rgba(233,69,96,.3)}
#howto ol li:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.08)}
#howto ol li h3{font-size:1.1rem;margin-bottom:.4rem;color:#1a1a2e}
#howto ol li p{font-size:.9rem;color:#666}
body.dark-mode #howto ol li{background:rgba(40,40,60,.2);border-color:rgba(255,255,255,.03)}
body.dark-mode #howto ol li h3{color:#e0e0e0}
body.dark-mode #howto ol li p{color:#aaa}

/* 文章卡片 */
#articles ul{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;margin-top:1rem}
#articles ul li{background:rgba(255,255,255,.5);backdrop-filter:blur(8px);border-radius:16px;padding:1.8rem 1.5rem;border:1px solid rgba(255,255,255,.4);transition:all .3s;display:flex;flex-direction:column;gap:.4rem}
#articles ul li:hover{transform:translateY(-6px);box-shadow:0 8px 30px rgba(0,0,0,.1)}
#articles ul li h3{font-size:1.15rem;color:#1a1a2e}
#articles ul li p{font-size:.9rem;color:#666;flex:1}
#articles ul li time{font-size:.8rem;color:#999;margin-top:.3rem}
#articles ul li a{align-self:flex-start;padding:.3rem 1rem;background:linear-gradient(135deg,#e94560,#0f3460);color:#fff;border-radius:20px;font-size:.85rem;font-weight:500;transition:all .3s;margin-top:.5rem}
#articles ul li a:hover{transform:scale(1.05);box-shadow:0 4px 16px rgba(233,69,96,.3)}
body.dark-mode #articles ul li{background:rgba(40,40,60,.2);border-color:rgba(255,255,255,.03)}
body.dark-mode #articles ul li h3{color:#e0e0e0}
body.dark-mode #articles ul li p{color:#aaa}
body.dark-mode #articles ul li time{color:#888}

/* 联系 */
#contact ul{margin:1rem 0;display:flex;flex-direction:column;gap:.6rem}
#contact ul li{padding:.6rem 0;font-weight:500;display:flex;align-items:center;gap:.5rem}
#contact ul li::before{content:'•';color:#e94560;font-size:1.5rem;line-height:1}
#contact p{margin-bottom:.4rem}

/* 底部 */
footer{background:#fff;padding:2rem 1.5rem;text-align:center;margin-top:3rem;border-top:1px solid rgba(0,0,0,.04)}
footer nav ul{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem 1.5rem;margin-bottom:1rem}
footer nav ul li a{color:#666;font-size:.9rem;transition:color .3s}
footer nav ul li a:hover{color:#e94560}
footer p{color:#999;font-size:.85rem;margin:.3rem 0}
body.dark-mode footer{background:#0a0a15;border-color:rgba(255,255,255,.04)}
body.dark-mode footer nav ul li a{color:#888}
body.dark-mode footer nav ul li a:hover{color:#ff6b81}
body.dark-mode footer p{color:#666}

/* 返回顶部 */
#backToTop{position:fixed;bottom:2rem;right:2rem;width:48px;height:48px;background:#e94560;color:#fff;border-radius:50%;font-size:1.4rem;display:none;z-index:999;box-shadow:0 4px 20px rgba(233,69,96,.4);transition:all .3s;line-height:48px;text-align:center}
#backToTop:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(233,69,96,.5);background:#c23152}

/* 响应式 */
@media(max-width:768px){
  html{font-size:15px}
  header{padding:0 1rem}
  nav{height:56px}
  nav ul{position:fixed;top:56px;left:0;width:100%;background:rgba(255,255,255,.95);backdrop-filter:blur(16px);flex-direction:column;padding:1rem;gap:0;transform:translateY(-120%);opacity:0;transition:all .4s;box-shadow:0 10px 30px rgba(0,0,0,.08);border-radius:0 0 20px 20px;z-index:999}
  nav ul.open{transform:translateY(0);opacity:1}
  nav ul li a{display:block;padding:.8rem 1rem;border-radius:8px}
  #menuToggle{display:block}
  nav input[type="text"]{display:none}
  #hero h1{font-size:2.2rem}
  #hero p{font-size:1rem}
  section{padding:1.8rem 1.2rem;margin:1.2rem 0;border-radius:16px}
  section h2{font-size:1.6rem}
  #products ul,#articles ul{grid-template-columns:1fr}
  #services ul{grid-template-columns:1fr 1fr}
  #howto ol{grid-template-columns:1fr 1fr}
  #backToTop{bottom:1.2rem;right:1.2rem;width:44px;height:44px;line-height:44px;font-size:1.2rem}
  body.dark-mode nav ul{background:rgba(15,15,26,.95)}
}
@media(max-width:480px){
  #hero h1{font-size:1.8rem}
  #hero p{font-size:.95rem}
  #hero a[role="button"]{padding:.8rem 2rem;font-size:.95rem}
  #services ul{grid-template-columns:1fr}
  #howto ol{grid-template-columns:1fr}
  section h2{font-size:1.4rem}
  footer nav ul{gap:.3rem 1rem}
}