:root{
  --bg:#f5f6f8;
  --bg-alt:#ffffff;
  --surface:#ffffff;
  --surface-2:#f0f2f6;
  --text:#222222;
  --text-soft:#444444;
  --muted:#888888;
  --line:#e5e5e5;
  --brand:#1a1a2e;
  --brand-2:#16213e;
  --brand-3:#0f3460;
  --accent:#ffb703;
  --accent-soft:#fff3d6;
  --accent-ink:#8a5a00;
  --link:#1a5fb4;
  --glass:rgba(255,255,255,.14);
  --glass-line:rgba(255,255,255,.22);
  --shadow:0 2px 8px rgba(0,0,0,.05);
  --shadow-lg:0 14px 40px rgba(16,24,48,.16);
  --radius:14px;
  --radius-sm:8px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

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

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

body{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.8;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  transition:background .35s var(--ease),color .35s var(--ease);
  overflow-x:hidden;
}

a{
  color:var(--link);
  text-decoration:none;
  transition:color .25s var(--ease),opacity .25s var(--ease);
}

a:hover{
  text-decoration:underline;
}

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

ul,
ol{
  list-style-position:inside;
}

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

/* ---------- Header ---------- */
header.site{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(26,26,46,.86);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  backdrop-filter:saturate(160%) blur(14px);
  color:#fff;
  border-bottom:1px solid rgba(255,255,255,.08);
  box-shadow:0 2px 18px rgba(0,0,0,.25);
}

.navbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 20px;
  max-width:1180px;
  margin:0 auto;
  flex-wrap:wrap;
  gap:10px;
}

.logo{
  font-size:22px;
  font-weight:700;
  color:#fff;
  display:flex;
  align-items:center;
  gap:8px;
  letter-spacing:.5px;
}

.logo span{
  color:var(--accent);
}

.logo:hover{
  text-decoration:none;
  opacity:.92;
}

nav.main ul{
  display:flex;
  list-style:none;
  gap:16px;
  flex-wrap:wrap;
}

nav.main a{
  color:#e8e8e8;
  font-size:15px;
  position:relative;
  padding:4px 0;
}

nav.main a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-2px;
  width:0;
  height:2px;
  background:var(--accent);
  border-radius:2px;
  transition:width .3s var(--ease);
}

nav.main a:hover{
  color:var(--accent);
  text-decoration:none;
}

nav.main a:hover::after{
  width:100%;
}

.search-box{
  display:flex;
  gap:6px;
}

.search-box input{
  padding:7px 12px;
  border:1px solid rgba(255,255,255,.18);
  border-radius:999px;
  font-size:14px;
  width:160px;
  background:rgba(255,255,255,.1);
  color:#fff;
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  transition:border-color .25s var(--ease),background .25s var(--ease),width .3s var(--ease);
}

.search-box input::placeholder{
  color:rgba(255,255,255,.6);
}

.search-box input:focus{
  outline:none;
  width:190px;
  border-color:var(--accent);
  background:rgba(255,255,255,.16);
}

.search-box button{
  padding:7px 16px;
  border:none;
  border-radius:999px;
  background:var(--accent);
  color:var(--brand);
  font-weight:700;
  cursor:pointer;
  font-size:14px;
  transition:transform .2s var(--ease),box-shadow .25s var(--ease),filter .25s var(--ease);
}

.search-box button:hover{
  transform:translateY(-1px);
  box-shadow:0 6px 16px rgba(255,183,3,.35);
  filter:brightness(1.05);
}

.burger{
  display:none;
  background:none;
  border:none;
  color:#fff;
  font-size:24px;
  cursor:pointer;
  padding:2px 8px;
  border-radius:var(--radius-sm);
  transition:background .25s var(--ease);
}

.burger:hover{
  background:rgba(255,255,255,.12);
}

.theme-toggle{
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.22);
  color:#fff;
  border-radius:999px;
  padding:5px 14px;
  cursor:pointer;
  font-size:13px;
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  transition:background .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}

.theme-toggle:hover{
  background:rgba(255,183,3,.18);
  border-color:var(--accent);
  color:var(--accent);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb{
  font-size:14px;
  color:var(--muted);
  padding:14px 0;
}

.breadcrumb a{
  color:var(--link);
}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  background:linear-gradient(135deg,#1a1a2e 0%,#16213e 55%,#0f3460 100%);
  color:#fff;
  padding:64px 0 56px;
  overflow:hidden;
}

.hero::before{
  content:"";
  position:absolute;
  top:-30%;
  right:-10%;
  width:520px;
  height:520px;
  background:radial-gradient(circle,rgba(255,183,3,.28),transparent 65%);
  filter:blur(20px);
  pointer-events:none;
}

.hero::after{
  content:"";
  position:absolute;
  bottom:-40%;
  left:-8%;
  width:460px;
  height:460px;
  background:radial-gradient(circle,rgba(80,150,255,.22),transparent 65%);
  filter:blur(24px);
  pointer-events:none;
}

.hero .wrap{
  position:relative;
  z-index:1;
}

.hero h1{
  font-size:34px;
  margin-bottom:16px;
  line-height:1.35;
  letter-spacing:.4px;
  animation:heroIn .8s var(--ease) both;
}

.hero h1 em{
  color:var(--accent);
  font-style:normal;
}

.hero p{
  font-size:17px;
  color:#d0d0d0;
  max-width:760px;
  animation:heroIn .8s .1s var(--ease) both;
}

.hero .lead-answer{
  margin-top:22px;
  padding:18px 22px;
  background:var(--glass);
  border-left:4px solid var(--accent);
  border-radius:var(--radius-sm);
  font-size:16px;
  color:#eaeaea;
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-top:1px solid var(--glass-line);
  border-right:1px solid var(--glass-line);
  border-bottom:1px solid var(--glass-line);
  animation:heroIn .8s .2s var(--ease) both;
}

.hero .lead-answer strong{
  color:var(--accent);
}

@keyframes heroIn{
  from{opacity:0;transform:translateY(22px);}
  to{opacity:1;transform:none;}
}

/* ---------- Slider ---------- */
.slider{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius);
  margin:30px 0 0;
  box-shadow:var(--shadow-lg);
}

.slides{
  display:flex;
  transition:transform .6s var(--ease);
  will-change:transform;
}

.slide{
  min-width:100%;
  padding:32px;
  background:linear-gradient(135deg,rgba(22,33,62,.96),rgba(15,52,96,.9));
  color:#fff;
  border-radius:var(--radius);
  border:1px solid var(--glass-line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}

.slide h3{
  color:var(--accent);
  margin-bottom:10px;
  font-size:21px;
}

.slide p{
  color:#d0d0d0;
  max-width:820px;
}

.dots{
  text-align:center;
  margin-top:14px;
}

.dots span{
  display:inline-block;
  width:10px;
  height:10px;
  border-radius:50%;
  background:rgba(255,255,255,.35);
  margin:0 5px;
  cursor:pointer;
  transition:background .25s var(--ease),transform .25s var(--ease),width .25s var(--ease);
}

.dots span:hover{
  transform:scale(1.2);
}

.dots span.active{
  background:var(--accent);
  width:26px;
  border-radius:999px;
}

/* ---------- Sections ---------- */
section{
  padding:48px 0;
  position:relative;
}

section:nth-child(even){
  background:var(--bg-alt);
}

h2{
  font-size:26px;
  margin-bottom:20px;
  color:var(--brand);
  border-left:5px solid var(--accent);
  padding-left:14px;
  line-height:1.4;
  letter-spacing:.3px;
}

h3{
  font-size:20px;
  margin:24px 0 10px;
  color:var(--brand-2);
  line-height:1.5;
}

h4{
  font-size:17px;
  margin:16px 0 8px;
  color:#333;
  line-height:1.5;
}

p{
  margin-bottom:12px;
  color:var(--text-soft);
}

section ul,
section ol{
  margin:0 0 16px;
  padding-left:6px;
}

section ul li,
section ol li{
  margin-bottom:8px;
  color:var(--text-soft);
}

section ul li strong,
section ol li strong{
  color:var(--brand-2);
}

/* ---------- Grid & Cards ---------- */
.grid{
  display:grid;
  gap:20px;
}

.grid-2{
  grid-template-columns:repeat(2,1fr);
}

.grid-3{
  grid-template-columns:repeat(3,1fr);
}

.card{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
  overflow:hidden;
}

.card::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(135deg,rgba(255,183,3,.08),transparent 55%);
  opacity:0;
  transition:opacity .35s var(--ease);
  pointer-events:none;
}

.card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(255,183,3,.55);
}

.card:hover::before{
  opacity:1;
}

.card h4{
  color:var(--brand-3);
  margin-top:0;
}

.card p:last-child{
  margin-bottom:0;
}

.tag{
  display:inline-block;
  background:var(--accent-soft);
  color:var(--accent-ink);
  font-size:12px;
  padding:2px 10px;
  border-radius:999px;
  margin-right:6px;
  font-weight:700;
  letter-spacing:.3px;
}

/* ---------- Stats ---------- */
.stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  text-align:center;
}

.stat{
  background:linear-gradient(150deg,var(--brand-2),var(--brand-3));
  color:#fff;
  padding:26px 18px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}

.stat:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lg);
}

.stat .num{
  font-size:32px;
  font-weight:700;
  color:var(--accent);
  line-height:1.2;
}

.stat .lbl{
  font-size:14px;
  color:#ccc;
}

/* ---------- Posts ---------- */
article.post{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
  margin-bottom:18px;
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}

article.post:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(255,183,3,.5);
}

article.post h3{
  margin-top:0;
  color:var(--brand-2);
}

article.post p:last-child{
  margin-bottom:0;
}

.post-meta{
  font-size:13px;
  color:var(--muted);
  margin-bottom:10px;
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
}

.post-meta time{
  margin-right:4px;
}

.readmore{
  display:inline-block;
  margin-top:8px;
  font-weight:700;
  color:var(--link);
  transition:transform .25s var(--ease),color .25s var(--ease);
}

.readmore:hover{
  text-decoration:none;
  color:var(--accent-ink);
  transform:translateX(4px);
}

/* ---------- FAQ ---------- */
.faq-item{
  border-bottom:1px solid var(--line);
  transition:background .3s var(--ease);
}

.faq-item:hover{
  background:rgba(255,183,3,.04);
}

.faq-q{
  width:100%;
  text-align:left;
  background:none;
  border:none;
  padding:16px 4px;
  font-size:16px;
  font-weight:700;
  color:var(--brand);
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  font-family:inherit;
  transition:color .25s var(--ease);
}

.faq-q:hover{
  color:var(--brand-3);
}

.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .4s var(--ease),padding .4s var(--ease);
  color:var(--text-soft);
  font-size:15px;
  padding:0 4px;
}

.faq-a p:last-child{
  margin-bottom:0;
}

.faq-item.open .faq-a{
  max-height:600px;
  padding-bottom:16px;
}

.faq-q .arrow{
  transition:transform .3s var(--ease);
  color:var(--accent);
  flex:0 0 auto;
}

.faq-item.open .arrow{
  transform:rotate(180deg);
}

/* ---------- Steps ---------- */
ol.steps{
  counter-reset:step;
  list-style:none;
  padding-left:0;
}

ol.steps li{
  position:relative;
  padding-left:48px;
  margin-bottom:16px;
  min-height:32px;
}

ol.steps li::before{
  counter-increment:step;
  content:counter(step);
  position:absolute;
  left:0;
  top:0;
  width:32px;
  height:32px;
  background:linear-gradient(135deg,var(--accent),#ffd166);
  color:var(--brand);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  box-shadow:0 4px 12px rgba(255,183,3,.35);
}

/* ---------- Reveal ---------- */
.reveal{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
  will-change:opacity,transform;
}

.reveal.visible{
  opacity:1;
  transform:none;
}

/* ---------- Tables ---------- */
.table-wrap{
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  border-radius:var(--radius-sm);
  margin:14px 0;
}

table{
  width:100%;
  border-collapse:collapse;
  margin:0;
  font-size:15px;
  background:var(--surface);
}

th,
td{
  border:1px solid var(--line);
  padding:11px 12px;
  text-align:left;
}

th{
  background:linear-gradient(135deg,var(--brand-2),var(--brand-3));
  color:#fff;
  font-weight:700;
  white-space:nowrap;
}

tbody tr{
  transition:background .25s var(--ease);
}

tbody tr:hover{
  background:rgba(255,183,3,.07);
}

/* ---------- Footer ---------- */
footer.site{
  background:linear-gradient(160deg,#1a1a2e,#141a2e 60%,#101828);
  color:#c8c8c8;
  padding:44px 0 20px;
  font-size:14px;
  border-top:1px solid rgba(255,255,255,.06);
}

footer.site a{
  color:#c8c8c8;
  transition:color .25s var(--ease),padding-left .25s var(--ease);
}

footer.site a:hover{
  color:var(--accent);
  text-decoration:none;
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}

.footer-grid h4{
  color:#fff;
  margin-bottom:12px;
  font-size:16px;
}

.footer-grid p{
  color:#a9a9a9;
}

.footer-grid ul{
  list-style:none;
  padding-left:0;
  margin:0;
}

.footer-grid li{
  margin-bottom:7px;
}

.copyright{
  text-align:center;
  margin-top:28px;
  padding-top:18px;
  border-top:1px solid rgba(255,255,255,.1);
  color:#999;
  font-size:13px;
}

.copyright p{
  color:#999;
  margin:0;
}

/* ---------- Back to top ---------- */
#backTop{
  position:fixed;
  right:22px;
  bottom:22px;
  width:46px;
  height:46px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--accent),#ffd166);
  color:var(--brand);
  border:none;
  font-size:20px;
  cursor:pointer;
  display:none;
  z-index:200;
  font-weight:700;
  box-shadow:0 8px 22px rgba(255,183,3,.4);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease);
}

#backTop:hover{
  transform:translateY(-3px) scale(1.05);
  box-shadow:0 12px 28px rgba(255,183,3,.55);
}

/* ---------- Dark mode ---------- */
body.dark{
  --bg:#121212;
  --bg-alt:#1b1b1b;
  --surface:#1e1e1e;
  --surface-2:#242424;
  --text:#dddddd;
  --text-soft:#c4c4c4;
  --muted:#9a9a9a;
  --line:#333333;
  --link:#7fb3ff;
  --accent-soft:#3a2f12;
  --accent-ink:#ffd166;
  --shadow:0 2px 8px rgba(0,0,0,.4);
  --shadow-lg:0 14px 40px rgba(0,0,0,.55);
  background:#121212;
  color:#dddddd;
}

body.dark section:nth-child(even){
  background:#1b1b1b;
}

body.dark .card,
body.dark article.post{
  background:#1e1e1e;
  border-color:#333;
}

body.dark h2,
body.dark h3,
body.dark h4,
body.dark p,
body.dark .faq-q{
  color:#e0e0e0;
}

body.dark .faq-q{
  color:#f0f0f0;
}

body.dark .faq-a{
  color:#bbbbbb;
}

body.dark section ul li,
body.dark section ol li{
  color:#c4c4c4;
}

body.dark section ul li strong,
body.dark section ol li strong{
  color:#ffd166;
}

body.dark table{
  background:#1e1e1e;
}

body.dark th,
body.dark td{
  border-color:#3a3a3a;
}

body.dark tbody tr:hover{
  background:rgba(255,183,3,.1);
}

body.dark .breadcrumb{
  color:#9a9a9a;
}

body.dark .faq-item:hover{
  background:rgba(255,183,3,.06);
}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .navbar{
    gap:12px;
  }

  nav.main ul{
    gap:12px;
  }

  nav.main a{
    font-size:14px;
  }

  .search-box input{
    width:130px;
  }

  .search-box input:focus{
    width:150px;
  }
}

@media (max-width:900px){
  .grid-3{
    grid-template-columns:1fr 1fr;
  }

  .footer-grid{
    grid-template-columns:1fr 1fr;
  }

  .stats{
    grid-template-columns:1fr 1fr;
  }

  .hero h1{
    font-size:29px;
  }
}

@media (max-width:640px){
  body{
    font-size:15px;
  }

  .grid-2,
  .grid-3{
    grid-template-columns:1fr;
  }

  .footer-grid{
    grid-template-columns:1fr;
  }

  nav.main{
    display:none;
  }

  nav.main.open{
    display:block;
    width:100%;
    animation:navDrop .3s var(--ease) both;
  }

  nav.main ul{
    flex-direction:column;
    gap:6px;
    padding:8px 0 4px;
    border-top:1px solid rgba(255,255,255,.12);
  }

  nav.main a{
    display:block;
    padding:8px 4px;
    font-size:15px;
  }

  nav.main a::after{
    display:none;
  }

  .burger{
    display:block;
  }

  .navbar{
    padding:10px 16px;
  }

  .logo{
    font-size:19px;
  }

  .search-box{
    order:5;
    width:100%;
  }

  .search-box input,
  .search-box input:focus{
    flex:1;
    width:auto;
  }

  .theme-toggle{
    margin-left:auto;
  }

  .hero{
    padding:44px 0 40px;
  }

  .hero h1{
    font-size:24px;
  }

  .hero p{
    font-size:15px;
  }

  .hero .lead-answer{
    font-size:15px;
    padding:14px 16px;
  }

  .slide{
    padding:22px;
  }

  .slide h3{
    font-size:18px;
  }

  .stats{
    grid-template-columns:1fr 1fr;
    gap:14px;
  }

  .stat{
    padding:20px 12px;
  }

  .stat .num{
    font-size:26px;
  }

  section{
    padding:36px 0;
  }

  h2{
    font-size:22px;
  }

  h3{
    font-size:18px;
  }

  .wrap{
    padding:0 16px;
  }

  .faq-q{
    font-size:15px;
  }

  ol.steps li{
    padding-left:42px;
  }

  #backTop{
    right:16px;
    bottom:16px;
    width:42px;
    height:42px;
  }
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-8px);}
  to{opacity:1;transform:none;}
}

@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.site,
  #backTop,
  .slider,
  .search-box,
  .theme-toggle,
  .burger{
    display:none !important;
  }

  body{
    background:#fff;
    color:#000;
  }

  a{
    color:#000;
  }

  .card,
  article.post{
    box-shadow:none;
    border:1px solid #ccc;
  }
}