:root{
  --primary:#ff4d6d;
  --primary-dark:#e63e5c;
  --primary-light:#ff8a5b;
  --accent:#ffb347;
  --purple:#6a5acd;
  --bg:#ffffff;
  --bg-soft:#fafafa;
  --bg-elevated:#ffffff;
  --text:#2b2b2b;
  --text-strong:#1f1f1f;
  --text-muted:#555;
  --text-faint:#888;
  --border:#eeeeee;
  --border-strong:#dddddd;
  --shadow-sm:0 4px 14px rgba(0,0,0,.04);
  --shadow-md:0 10px 26px rgba(0,0,0,.08);
  --shadow-primary:0 8px 24px rgba(255,77,109,.15);
  --shadow-primary-strong:0 6px 18px rgba(255,77,109,.4);
  --glass-bg:rgba(255,255,255,.72);
  --glass-border:rgba(255,255,255,.55);
  --radius-sm:10px;
  --radius:14px;
  --radius-lg:18px;
  --radius-pill:26px;
  --transition:.3s cubic-bezier(.22,.61,.36,1);
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  font-family:var(--font);
  color:var(--text);
  background:var(--bg);
  line-height:1.8;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  transition:background var(--transition),color var(--transition);
  overflow-x:hidden;
}

a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{text-decoration:underline}

img,svg{max-width:100%;display:block;height:auto}

h1,h2,h3,h4{line-height:1.4;font-weight:700}

::selection{background:rgba(255,77,109,.22);color:var(--text-strong)}

:focus-visible{outline:2px solid var(--primary);outline-offset:3px;border-radius:4px}

header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--glass-bg);
  backdrop-filter:saturate(180%) blur(16px);
  -webkit-backdrop-filter:saturate(180%) blur(16px);
  box-shadow:0 2px 8px rgba(0,0,0,.08);
  border-bottom:1px solid rgba(255,255,255,.3);
  transition:background var(--transition),box-shadow var(--transition);
}

.topbar{
  background:#1f1f1f;
  color:#dddddd;
  font-size:13px;
  padding:6px 0;
  letter-spacing:.2px;
}

.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}

.topbar .wrap{
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:8px;
}

.topbar span{opacity:.9}

.navbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 0;
  gap:16px;
  flex-wrap:wrap;
}

.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:22px;
  font-weight:700;
  color:var(--text-strong);
  letter-spacing:.3px;
  transition:transform var(--transition),color var(--transition);
}
.logo:hover{text-decoration:none;transform:translateY(-1px)}

.logo .mark{
  width:38px;
  height:38px;
  border-radius:var(--radius-sm);
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  display:flex;
  align-items:center;
  justify-content:center;
  color:#ffffff;
  font-size:16px;
  font-weight:700;
  box-shadow:0 4px 12px rgba(255,77,109,.35);
  transition:transform var(--transition),box-shadow var(--transition);
}
.logo:hover .mark{transform:rotate(-6deg) scale(1.05);box-shadow:0 6px 18px rgba(255,77,109,.5)}

nav ul{
  display:flex;
  gap:20px;
  list-style:none;
  flex-wrap:wrap;
  align-items:center;
}

nav a{
  color:#333333;
  font-size:15px;
  position:relative;
  padding:4px 0;
  transition:color var(--transition);
}
nav a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:2px;
  background:linear-gradient(90deg,var(--primary),var(--primary-light));
  border-radius:2px;
  transition:width var(--transition);
}
nav a:hover{color:var(--primary);text-decoration:none}
nav a:hover::after{width:100%}

.nav-tools{
  display:flex;
  gap:10px;
  align-items:center;
}

.search-box{
  display:flex;
  border:1px solid var(--border-strong);
  border-radius:20px;
  overflow:hidden;
  background:var(--bg-elevated);
  transition:border-color var(--transition),box-shadow var(--transition);
}
.search-box:focus-within{
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(255,77,109,.14);
}
.search-box input{
  border:none;
  padding:8px 14px;
  outline:none;
  font-size:14px;
  width:150px;
  background:transparent;
  color:var(--text);
  font-family:inherit;
}
.search-box input::placeholder{color:#aaaaaa}
.search-box button{
  border:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#ffffff;
  padding:8px 16px;
  cursor:pointer;
  font-size:14px;
  font-family:inherit;
  transition:filter var(--transition),transform var(--transition);
}
.search-box button:hover{filter:brightness(1.08)}
.search-box button:active{transform:scale(.97)}

.btn-mode{
  border:1px solid var(--border-strong);
  background:var(--bg-elevated);
  border-radius:20px;
  padding:8px 14px;
  cursor:pointer;
  font-size:14px;
  color:var(--text);
  transition:all var(--transition);
  line-height:1;
}
.btn-mode:hover{border-color:var(--primary);transform:translateY(-1px);box-shadow:var(--shadow-sm)}

.menu-toggle{
  display:none;
  border:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#ffffff;
  padding:8px 14px;
  border-radius:8px;
  font-size:15px;
  cursor:pointer;
  transition:transform var(--transition),filter var(--transition);
}
.menu-toggle:hover{filter:brightness(1.08)}
.menu-toggle:active{transform:scale(.95)}

.hero{
  background:linear-gradient(135deg,#fff0f3,#ffe8d6);
  padding:50px 0;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  top:-120px;
  right:-120px;
  width:380px;
  height:380px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(255,138,91,.28),transparent 70%);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  bottom:-160px;
  left:-100px;
  width:420px;
  height:420px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(255,77,109,.18),transparent 70%);
  pointer-events:none;
}

.hero .wrap{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:40px;
  align-items:center;
  position:relative;
  z-index:1;
}

.hero h1{
  font-size:36px;
  line-height:1.35;
  color:var(--text-strong);
  margin-bottom:18px;
  letter-spacing:-.3px;
}
.hero h1 span{
  color:var(--primary);
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
}

.hero p{
  font-size:16px;
  color:var(--text-muted);
  margin-bottom:14px;
}

.hero .cta{
  display:inline-block;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#ffffff;
  padding:12px 30px;
  border-radius:var(--radius-pill);
  font-size:16px;
  margin-top:10px;
  box-shadow:var(--shadow-primary);
  transition:transform var(--transition),box-shadow var(--transition),filter var(--transition);
}
.hero .cta:hover{
  background:linear-gradient(135deg,var(--primary-dark),var(--primary));
  text-decoration:none;
  transform:translateY(-2px);
  box-shadow:0 12px 28px rgba(255,77,109,.32);
}
.hero .cta:active{transform:translateY(0) scale(.98)}

.banner{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:var(--bg-elevated);
  box-shadow:var(--shadow-primary);
  min-height:280px;
}

.slides{
  position:relative;
  height:280px;
}

.slide{
  position:absolute;
  inset:0;
  opacity:0;
  transition:opacity .6s ease;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:30px;
  color:#ffffff;
  pointer-events:none;
}
.slide.active{opacity:1;pointer-events:auto}

.slide:nth-child(1){background:linear-gradient(135deg,#ff4d6d,#ff8a5b)}
.slide:nth-child(2){background:linear-gradient(135deg,#6a5acd,#ff4d6d)}
.slide:nth-child(3){background:linear-gradient(135deg,#ff8a5b,#ffb347)}

.slide h3{font-size:22px;margin-bottom:10px;letter-spacing:.2px}
.slide p{font-size:15px;opacity:.95;line-height:1.7}

.dots{
  position:absolute;
  bottom:14px;
  left:30px;
  display:flex;
  gap:8px;
  z-index:2;
}
.dots span{
  width:10px;
  height:10px;
  border-radius:50%;
  background:rgba(255,255,255,.5);
  cursor:pointer;
  transition:background var(--transition),transform var(--transition);
}
.dots span:hover{transform:scale(1.25)}
.dots span.active{background:#ffffff;transform:scale(1.15)}

.stats{
  background:#1f1f1f;
  color:#ffffff;
  padding:36px 0;
  position:relative;
  overflow:hidden;
}
.stats::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(120deg,transparent 40%,rgba(255,138,91,.08) 50%,transparent 60%);
  pointer-events:none;
}

.stats .wrap{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  text-align:center;
  position:relative;
  z-index:1;
}

.stat .num{
  font-size:32px;
  font-weight:700;
  color:var(--primary-light);
  letter-spacing:.5px;
  font-variant-numeric:tabular-nums;
}
.stat .label{
  font-size:14px;
  color:#bbbbbb;
  margin-top:6px;
}

section{
  padding:56px 0;
  scroll-margin-top:88px;
}
section:nth-child(even){background:var(--bg-soft)}

.sec-head{
  text-align:center;
  margin-bottom:36px;
}
.sec-head h2{
  font-size:28px;
  color:var(--text-strong);
  margin-bottom:12px;
  letter-spacing:-.2px;
  position:relative;
  display:inline-block;
}
.sec-head h2::after{
  content:"";
  display:block;
  width:56px;
  height:3px;
  margin:12px auto 0;
  border-radius:3px;
  background:linear-gradient(90deg,var(--primary),var(--primary-light));
}
.sec-head p{
  color:var(--text-muted);
  font-size:15px;
  max-width:720px;
  margin:0 auto;
}

.grid-3{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.grid-2{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:24px;
}

.card{
  background:var(--bg-elevated);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:24px;
  box-shadow:var(--shadow-sm);
  transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition);
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background:linear-gradient(90deg,var(--primary),var(--primary-light),var(--accent));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform var(--transition);
}
.card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
  border-color:rgba(255,77,109,.25);
}
.card:hover::before{transform:scaleX(1)}

.card h3{
  font-size:18px;
  color:var(--text-strong);
  margin-bottom:10px;
}
.card h4{
  font-size:15px;
  color:var(--primary);
  margin:14px 0 6px;
}
.card p{
  font-size:14px;
  color:var(--text-muted);
}

.article-list{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:24px;
}

.article{
  background:var(--bg-elevated);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:22px;
  transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition);
  position:relative;
}
.article:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
  border-color:rgba(255,77,109,.25);
}
.article .meta{
  font-size:12px;
  color:#999999;
  margin-bottom:8px;
  letter-spacing:.2px;
}
.article h3{
  font-size:17px;
  margin-bottom:8px;
  color:var(--text-strong);
  transition:color var(--transition);
}
.article:hover h3{color:var(--primary)}
.article .sum{
  font-size:14px;
  color:var(--text-muted);
  margin-bottom:12px;
}
.article .read{
  font-size:14px;
  color:var(--primary);
  font-weight:600;
  display:inline-block;
  transition:transform var(--transition),color var(--transition);
}
.article .read:hover{text-decoration:none;transform:translateX(4px);color:var(--primary-dark)}

.faq-item{
  border:1px solid var(--border);
  border-radius:12px;
  margin-bottom:12px;
  background:var(--bg-elevated);
  overflow:hidden;
  transition:border-color var(--transition),box-shadow var(--transition);
}
.faq-item:hover{border-color:rgba(255,77,109,.3);box-shadow:var(--shadow-sm)}
.faq-item.open{border-color:rgba(255,77,109,.4);box-shadow:var(--shadow-sm)}

.faq-q{
  width:100%;
  text-align:left;
  border:none;
  background:var(--bg-elevated);
  padding:16px 20px;
  font-size:15px;
  font-weight:600;
  color:var(--text-strong);
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  font-family:inherit;
  transition:background var(--transition),color var(--transition);
  line-height:1.6;
}
.faq-q:hover{color:var(--primary)}
.faq-q::after{
  content:"+";
  font-size:20px;
  color:var(--primary);
  flex-shrink:0;
  transition:transform var(--transition);
  line-height:1;
}
.faq-item.open .faq-q::after{content:"−";transform:rotate(180deg)}

.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .35s ease,padding .35s ease;
  padding:0 20px;
  font-size:14px;
  color:var(--text-muted);
}
.faq-item.open .faq-a{
  max-height:600px;
  padding:0 20px 18px;
}

.howto-step{
  border-left:3px solid var(--primary);
  padding-left:18px;
  margin-bottom:20px;
  transition:border-color var(--transition),transform var(--transition);
}
.howto-step:hover{border-color:var(--primary-light);transform:translateX(3px)}
.howto-step h4{
  font-size:16px;
  color:var(--text-strong);
  margin-bottom:6px;
}
.howto-step p{
  font-size:14px;
  color:var(--text-muted);
}

.contact-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:24px;
}

.contact-item{
  display:flex;
  gap:14px;
  align-items:flex-start;
  background:var(--bg-elevated);
  border:1px solid var(--border);
  border-radius:12px;
  padding:18px;
  transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition);
}
.contact-item:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-md);
  border-color:rgba(255,77,109,.25);
}
.contact-item .ico{
  width:44px;
  height:44px;
  border-radius:var(--radius-sm);
  background:linear-gradient(135deg,rgba(255,77,109,.12),rgba(255,138,91,.16));
  flex-shrink:0;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--primary);
  font-weight:700;
  font-size:15px;
  transition:transform var(--transition),background var(--transition);
}
.contact-item:hover .ico{
  transform:scale(1.08) rotate(-4deg);
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#ffffff;
}
.contact-item h4{
  font-size:15px;
  margin-bottom:4px;
  color:var(--text-strong);
}
.contact-item p{
  font-size:14px;
  color:var(--text-muted);
  word-break:break-word;
}

.reveal{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .6s ease,transform .6s ease;
  will-change:opacity,transform;
}
.reveal.visible{
  opacity:1;
  transform:none;
}

footer{
  background:#1f1f1f;
  color:#bbbbbb;
  padding:48px 0 20px;
}
footer .cols{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:30px;
  margin-bottom:30px;
}
footer h4{
  color:#ffffff;
  font-size:16px;
  margin-bottom:14px;
}
footer ul{list-style:none}
footer li{margin-bottom:8px;font-size:14px}
footer a{
  color:#bbbbbb;
  transition:color var(--transition),padding-left var(--transition);
  display:inline-block;
}
footer a:hover{color:var(--primary-light);text-decoration:none;padding-left:3px}
footer .bottom{
  border-top:1px solid #333333;
  padding-top:18px;
  font-size:13px;
  text-align:center;
  color:#888888;
}
footer p{font-size:14px}

.back-top{
  position:fixed;
  right:24px;
  bottom:80px;
  width:48px;
  height:48px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#ffffff;
  border:none;
  cursor:pointer;
  font-size:20px;
  display:none;
  align-items:center;
  justify-content:center;
  z-index:200;
  box-shadow:var(--shadow-primary-strong);
  transition:transform var(--transition),box-shadow var(--transition),filter var(--transition);
}
.back-top.show{display:flex}
.back-top:hover{transform:translateY(-3px) scale(1.05);filter:brightness(1.08);box-shadow:0 10px 26px rgba(255,77,109,.5)}
.back-top:active{transform:translateY(0) scale(.95)}

body.dark{
  --bg:#121212;
  --bg-soft:#171717;
  --bg-elevated:#1e1e1e;
  --text:#dddddd;
  --text-strong:#eeeeee;
  --text-muted:#b0b0b0;
  --text-faint:#888888;
  --border:#333333;
  --border-strong:#3a3a3a;
  --shadow-sm:0 4px 14px rgba(0,0,0,.35);
  --shadow-md:0 10px 26px rgba(0,0,0,.5);
  --glass-bg:rgba(24,24,24,.72);
  --glass-border:rgba(255,255,255,.08);
  background:#121212;
  color:#dddddd;
}

body.dark header{
  background:var(--glass-bg);
  border-bottom:1px solid #2a2a2a;
  box-shadow:0 2px 8px rgba(0,0,0,.4);
}
body.dark .topbar{background:#0d0d0d;color:#999999}
body.dark .logo{color:#eeeeee}
body.dark nav a{color:#cccccc}
body.dark nav a:hover{color:var(--primary)}
body.dark nav ul{background:#1e1e1e}
body.dark .card,
body.dark .article,
body.dark .faq-item,
body.dark .faq-q,
body.dark .contact-item,
body.dark .btn-mode,
body.dark .search-box{
  background:var(--bg-elevated);
  color:#dddddd;
  border-color:#333333;
}
body.dark .card h3,
body.dark .article h3,
body.dark .faq-q,
body.dark .sec-head h2,
body.dark .howto-step h4,
body.dark .contact-item h4{
  color:#eeeeee;
}
body.dark .hero{
  background:linear-gradient(135deg,#2a1a1e,#2a2418);
}
body.dark .hero::before{background:radial-gradient(circle,rgba(255,138,91,.16),transparent 70%)}
body.dark .hero::after{background:radial-gradient(circle,rgba(255,77,109,.12),transparent 70%)}
body.dark .hero h1{color:#f5f5f5}
body.dark .hero p{color:#b0b0b0}
body.dark section:nth-child(even){background:#171717}
body.dark .search-box input{background:transparent;color:#dddddd}
body.dark .search-box input::placeholder{color:#777777}
body.dark .article .meta{color:#777777}
body.dark footer{background:#0d0d0d}
body.dark .stats{background:#0d0d0d}
body.dark .banner{background:var(--bg-elevated)}
body.dark .dots span{background:rgba(255,255,255,.35)}
body.dark .dots span.active{background:#ffffff}

@media(hover:none){
  .card:hover,.article:hover,.contact-item:hover,.back-top:hover{transform:none}
  .card:hover::before{transform:scaleX(0)}
}

@media(max-width:1024px){
  .hero h1{font-size:32px}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}

@media(max-width:900px){
  .hero .wrap,
  .grid-3,
  .grid-2,
  .article-list,
  .contact-grid,
  footer .cols,
  .stats .wrap{
    grid-template-columns:1fr;
  }

  .navbar{position:relative}

  nav ul{
    display:none;
    flex-direction:column;
    position:absolute;
    top:100%;
    left:0;
    right:0;
    background:var(--bg-elevated);
    padding:16px 20px;
    box-shadow:0 8px 16px rgba(0,0,0,.1);
    border-radius:0 0 var(--radius) var(--radius);
    gap:12px;
    z-index:99;
  }
  nav ul.open{display:flex}
  nav ul li{width:100%}
  nav a{display:block;padding:6px 0}

  .menu-toggle{display:block}

  .search-box input{width:100px}

  .hero{padding:36px 0}
  .hero h1{font-size:28px}
  .hero .wrap{gap:28px}

  .slides{height:240px}
  .banner{min-height:240px}

  .stats .wrap{gap:24px}
  .stat .num{font-size:28px}

  section{padding:44px 0}
  .sec-head h2{font-size:24px}
}

@media(max-width:600px){
  body{font-size:15px}
  .wrap{padding:0 16px}

  .topbar{font-size:12px}
  .topbar .wrap{justify-content:center;text-align:center}

  .navbar{padding:12px 0;gap:12px}
  .logo{font-size:19px}
  .logo .mark{width:34px;height:34px;font-size:14px}

  .nav-tools{gap:8px}
  .search-box input{width:88px;padding:7px 10px;font-size:13px}
  .search-box button{padding:7px 12px;font-size:13px}
  .btn-mode{padding:7px 11px}
  .menu-toggle{padding:7px 12px}

  .hero{padding:28px 0}
  .hero h1{font-size:24px;line-height:1.4}
  .hero p{font-size:15px}
  .hero .cta{padding:11px 24px;font-size:15px}

  .slides{height:220px}
  .banner{min-height:220px}
  .slide{padding:22px}
  .slide h3{font-size:19px}
  .slide p{font-size:14px}
  .dots{left:22px;bottom:12px}

  .stats{padding:28px 0}
  .stat .num{font-size:26px}

  section{padding:36px 0}
  .sec-head{margin-bottom:26px}
  .sec-head h2{font-size:21px}
  .sec-head p{font-size:14px}

  .card{padding:20px}
  .card h3{font-size:17px}
  .article{padding:18px}
  .article h3{font-size:16px}

  .faq-q{padding:14px 16px;font-size:14px}
  .faq-a{padding:0 16px}
  .faq-item.open .faq-a{padding:0 16px 16px}

  .howto-step{padding-left:14px;margin-bottom:16px}

  .contact-item{padding:16px}
  .contact-item .ico{width:40px;height:40px}

  footer{padding:36px 0 16px}
  footer .cols{gap:24px;margin-bottom:24px}
  footer .bottom{font-size:12px}

  .back-top{right:16px;bottom:64px;width:44px;height:44px;font-size:18px}
}

@media(prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
}

@media print{
  header,footer,.back-top,.nav-tools,nav{display:none !important}
  body{background:#ffffff;color:#000000}
  section{padding:16px 0}
  .card,.article{border:1px solid #cccccc;box-shadow:none}
}