:root{
  --brand:#1a6fd4;
  --brand-dark:#155bb0;
  --brand-light:#4fc3f7;
  --bg:#f7f8fa;
  --bg-alt:#ffffff;
  --bg-elev:#ffffff;
  --bg-glass:rgba(255,255,255,.65);
  --bg-glass-strong:rgba(255,255,255,.82);
  --text:#2c2c2c;
  --text-soft:#4b5563;
  --text-mute:#6b7280;
  --text-faint:#9aa0ad;
  --line:#e6e8ee;
  --line-soft:#eef0f4;
  --shadow-sm:0 2px 10px rgba(15,30,60,.06);
  --shadow-md:0 10px 26px rgba(15,30,60,.10);
  --shadow-lg:0 18px 44px rgba(15,30,60,.16);
  --radius:14px;
  --radius-sm:10px;
  --header-bg:#1a1a2e;
  --hero-grad:linear-gradient(135deg,#1a1a2e 0%,#16213e 45%,#0f3460 100%);
  --accent-grad:linear-gradient(120deg,#1a6fd4 0%,#4fc3f7 100%);
  --glass-border:rgba(255,255,255,.35);
  --focus:#4fc3f7;
}

body.dark{
  --bg:#14161c;
  --bg-alt:#1b1e26;
  --bg-elev:#222632;
  --bg-glass:rgba(34,38,50,.62);
  --bg-glass-strong:rgba(34,38,50,.86);
  --text:#d8dae0;
  --text-soft:#b8bcc8;
  --text-mute:#9aa0ad;
  --text-faint:#7c8290;
  --line:#2a2e3a;
  --line-soft:#2e3442;
  --shadow-sm:0 2px 10px rgba(0,0,0,.35);
  --shadow-md:0 10px 26px rgba(0,0,0,.45);
  --shadow-lg:0 18px 44px rgba(0,0,0,.55);
  --header-bg:#0e1015;
  --hero-grad:linear-gradient(135deg,#0b0d12 0%,#101a2e 45%,#0b2a4d 100%);
  --glass-border:rgba(255,255,255,.12);
}

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

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;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  transition:background .3s ease,color .3s ease;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(60vw 60vw at 8% -10%,rgba(79,195,247,.14),transparent 60%),
    radial-gradient(50vw 50vw at 100% 0%,rgba(26,111,212,.12),transparent 55%);
}

body.dark::before{
  background:
    radial-gradient(60vw 60vw at 8% -10%,rgba(79,195,247,.10),transparent 60%),
    radial-gradient(50vw 50vw at 100% 0%,rgba(26,111,212,.14),transparent 55%);
}

a{color:var(--brand);text-decoration:none;transition:color .2s ease,opacity .2s ease}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--focus);outline-offset:2px}

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

::selection{background:rgba(26,111,212,.25);color:inherit}

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

/* ============ Header ============ */
header.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:var(--header-bg);
  color:#fff;
  box-shadow:0 2px 12px rgba(0,0,0,.18);
  backdrop-filter:saturate(140%) blur(10px);
  -webkit-backdrop-filter:saturate(140%) blur(10px);
  transition:background .3s ease;
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 20px;
  max-width:1180px;
  margin:0 auto;
  gap:16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:20px;
  font-weight:700;
  color:#fff;
  white-space:nowrap;
  letter-spacing:.2px;
  transition:transform .25s ease,opacity .25s ease;
}
.brand:hover{text-decoration:none;transform:translateY(-1px);opacity:.92}
.brand svg{width:36px;height:36px;filter:drop-shadow(0 3px 8px rgba(26,111,212,.45))}

nav.main-nav{display:flex;gap:4px;flex-wrap:wrap}

nav.main-nav a{
  position:relative;
  color:#e6e8ee;
  padding:8px 12px;
  border-radius:8px;
  font-size:15px;
  transition:background .22s ease,color .22s ease,transform .22s ease;
}
nav.main-nav a::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:4px;
  height:2px;
  border-radius:2px;
  background:var(--brand-light);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s ease;
}
nav.main-nav a:hover{
  background:rgba(255,255,255,.12);
  text-decoration:none;
  color:#fff;
}
nav.main-nav a:hover::after{transform:scaleX(1)}

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

.search-box{
  display:flex;
  align-items:center;
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.14);
  border-radius:20px;
  padding:4px 12px;
  transition:background .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.search-box:focus-within{
  background:rgba(255,255,255,.2);
  border-color:rgba(79,195,247,.6);
  box-shadow:0 0 0 3px rgba(79,195,247,.18);
}
.search-box input{
  background:transparent;
  border:none;
  outline:none;
  color:#fff;
  width:130px;
  font-size:14px;
  font-family:inherit;
}
.search-box input::placeholder{color:#b8bcc8}
.search-box button{
  background:transparent;
  border:none;
  color:#fff;
  cursor:pointer;
  font-size:14px;
  line-height:1;
  padding:4px;
  border-radius:50%;
  transition:transform .2s ease;
}
.search-box button:hover{transform:scale(1.15)}

.tool-btn{
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.14);
  color:#fff;
  width:38px;height:38px;
  border-radius:50%;
  cursor:pointer;
  font-size:16px;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:background .22s ease,transform .22s ease;
}
.tool-btn:hover{background:rgba(255,255,255,.24);transform:rotate(-12deg) scale(1.05)}
.tool-btn:active{transform:scale(.94)}

.menu-toggle{
  display:none;
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.14);
  color:#fff;
  width:38px;height:38px;
  border-radius:8px;
  cursor:pointer;
  font-size:20px;
  transition:background .22s ease;
}
.menu-toggle:hover{background:rgba(255,255,255,.24)}

/* ============ Breadcrumb ============ */
.breadcrumb{
  background:var(--bg-alt);
  border-bottom:1px solid var(--line);
  font-size:14px;
  padding:10px 0;
  transition:background .3s ease,border-color .3s ease;
}
.breadcrumb .container{display:flex;gap:8px;flex-wrap:wrap;color:var(--text-mute)}
.breadcrumb a{color:var(--brand)}
.breadcrumb a:hover{opacity:.85}

/* ============ Hero ============ */
.hero{
  position:relative;
  background:var(--hero-grad);
  color:#fff;
  overflow:hidden;
  isolation:isolate;
}
.hero::before{
  content:"";
  position:absolute;
  inset:-40% -10% auto -10%;
  height:120%;
  background:
    radial-gradient(40% 60% at 18% 20%,rgba(79,195,247,.28),transparent 70%),
    radial-gradient(38% 55% at 82% 30%,rgba(26,111,212,.35),transparent 70%);
  filter:blur(10px);
  z-index:-1;
  animation:heroGlow 14s ease-in-out infinite alternate;
}
.hero::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse at center,black 30%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse at center,black 30%,transparent 78%);
  z-index:-1;
  opacity:.5;
}
@keyframes heroGlow{
  from{transform:translate3d(-2%,-1%,0) scale(1)}
  to{transform:translate3d(2%,2%,0) scale(1.06)}
}

.hero-slides{position:relative;min-height:420px}

.hero-slide{
  display:none;
  padding:70px 20px;
  text-align:center;
  animation:fadeIn .6s ease both;
}
.hero-slide.active{display:block}

@keyframes fadeIn{
  from{opacity:0;transform:translateY(14px)}
  to{opacity:1;transform:translateY(0)}
}

.hero-slide h1{
  font-size:38px;
  margin-bottom:18px;
  letter-spacing:1px;
  line-height:1.35;
  text-shadow:0 4px 24px rgba(0,0,0,.35);
}
.hero-slide h1 span{
  background:linear-gradient(90deg,#4fc3f7,#8be0ff);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-slide p{
  font-size:17px;
  max-width:760px;
  margin:0 auto 26px;
  color:#cfd6e6;
}

.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

.btn{
  display:inline-block;
  padding:12px 28px;
  border-radius:10px;
  font-size:16px;
  font-weight:600;
  transition:transform .22s ease,box-shadow .22s ease,background .22s ease,color .22s ease;
  will-change:transform;
}
.btn:hover{transform:translateY(-2px);text-decoration:none}
.btn:active{transform:translateY(0) scale(.98)}

.btn-primary{
  background:var(--accent-grad);
  color:#fff;
  box-shadow:0 8px 22px rgba(26,111,212,.4);
}
.btn-primary:hover{box-shadow:0 12px 30px rgba(26,111,212,.55)}

.btn-outline{
  border:2px solid rgba(79,195,247,.85);
  color:#8be0ff;
  background:rgba(79,195,247,.08);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.btn-outline:hover{
  background:rgba(79,195,247,.18);
  color:#fff;
  box-shadow:0 8px 22px rgba(79,195,247,.28);
}

.hero-dots{
  position:absolute;
  bottom:18px;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  gap:10px;
  z-index:2;
}
.hero-dots button{
  width:12px;height:12px;
  border-radius:50%;
  border:none;
  background:rgba(255,255,255,.35);
  cursor:pointer;
  padding:0;
  transition:background .25s ease,transform .25s ease,width .25s ease;
}
.hero-dots button:hover{background:rgba(255,255,255,.6);transform:scale(1.15)}
.hero-dots button.active{background:var(--brand-light);width:26px;border-radius:6px}

/* ============ Stats ============ */
.stats{
  background:var(--bg-alt);
  padding:34px 0;
  border-bottom:1px solid var(--line);
  transition:background .3s ease,border-color .3s ease;
}
.stats-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  text-align:center;
}
.stat-num{
  font-size:34px;
  font-weight:800;
  color:var(--brand);
  letter-spacing:.5px;
  font-variant-numeric:tabular-nums;
}
.stat-label{font-size:14px;color:var(--text-mute)}

/* ============ Anchor nav ============ */
.anchor-nav{
  background:rgba(238,243,251,.85);
  padding:16px 0;
  border-bottom:1px solid #dbe6f5;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:background .3s ease,border-color .3s ease;
}
body.dark .anchor-nav{background:rgba(30,35,48,.85);border-color:var(--line)}
.anchor-nav ul{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  list-style:none;
  justify-content:center;
}
.anchor-nav a{
  display:inline-block;
  font-size:14px;
  padding:6px 14px;
  background:var(--bg-alt);
  border-radius:16px;
  color:var(--brand);
  border:1px solid #dbe6f5;
  transition:background .22s ease,color .22s ease,transform .22s ease,box-shadow .22s ease;
}
body.dark .anchor-nav a{border-color:#333a49;color:#6fb1f5}
.anchor-nav a:hover{
  text-decoration:none;
  background:var(--brand);
  color:#fff;
  transform:translateY(-2px);
  box-shadow:0 6px 16px rgba(26,111,212,.3);
}

/* ============ Main / Sections ============ */
main{display:block}

section.block{
  padding:56px 0;
  transition:background .3s ease;
}
section.block:nth-child(even){background:var(--bg-alt)}

.section-title{
  font-size:28px;
  margin-bottom:10px;
  color:var(--text);
  position:relative;
  padding-left:16px;
  line-height:1.4;
}
.section-title::before{
  content:"";
  position:absolute;
  left:0;top:6px;bottom:6px;
  width:5px;
  border-radius:3px;
  background:var(--accent-grad);
  box-shadow:0 0 12px rgba(79,195,247,.5);
}
.section-sub{
  color:var(--text-mute);
  margin-bottom:32px;
  font-size:15px;
}

/* ============ Grids ============ */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* ============ Cards (glass + rounded) ============ */
.card{
  position:relative;
  background:var(--bg-glass);
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  border-radius:var(--radius);
  padding:24px;
  box-shadow:var(--shadow-sm);
  border:1px solid var(--glass-border);
  transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease,background .3s ease;
  overflow:hidden;
}
body.dark .card{background:var(--bg-glass);border-color:rgba(255,255,255,.08)}
.card::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(130deg,rgba(255,255,255,.28),transparent 42%);
  opacity:0;
  transition:opacity .3s ease;
  pointer-events:none;
}
body.dark .card::before{background:linear-gradient(130deg,rgba(255,255,255,.06),transparent 42%)}
.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-md);
  border-color:rgba(79,195,247,.45);
}
.card:hover::before{opacity:1}

.card h3{
  font-size:19px;
  margin-bottom:10px;
  color:var(--text);
  line-height:1.5;
}
.card h4{
  font-size:16px;
  margin:14px 0 8px;
  color:var(--brand);
}
.card p{font-size:15px;color:var(--text-soft);margin-bottom:10px}
.card ul{margin:8px 0 0 18px;font-size:15px;color:var(--text-soft)}
.card ul li{margin-bottom:4px}
.card ul li::marker{color:var(--brand-light)}

/* ============ Article list ============ */
.article-list{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:22px;
}
.article-item{
  position:relative;
  background:var(--bg-glass);
  backdrop-filter:blur(12px) saturate(140%);
  -webkit-backdrop-filter:blur(12px) saturate(140%);
  border-radius:var(--radius);
  padding:22px;
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-sm);
  transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease;
}
body.dark .article-item{border-color:rgba(255,255,255,.08)}
.article-item:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
  border-color:rgba(79,195,247,.45);
}
.article-item h3{font-size:18px;margin-bottom:8px;line-height:1.5}
.article-item h3 a{color:var(--text)}
.article-item h3 a:hover{color:var(--brand);text-decoration:none}
.article-meta{
  font-size:13px;
  color:var(--text-faint);
  margin-bottom:10px;
  letter-spacing:.2px;
}
.article-item p{font-size:14px;color:var(--text-soft);margin-bottom:12px}
.read-more{
  font-size:14px;
  font-weight:600;
  color:var(--brand);
  display:inline-flex;
  align-items:center;
  gap:4px;
  transition:gap .22s ease,color .22s ease;
}
.read-more:hover{text-decoration:none;gap:8px;color:var(--brand-dark)}

/* ============ FAQ ============ */
.faq-item{
  border:1px solid var(--line);
  border-radius:12px;
  margin-bottom:12px;
  overflow:hidden;
  background:var(--bg-glass);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:border-color .25s ease,box-shadow .25s ease,background .3s ease;
}
.faq-item:hover{border-color:rgba(79,195,247,.5)}
.faq-item.open{
  border-color:rgba(79,195,247,.6);
  box-shadow:0 8px 22px rgba(26,111,212,.12);
}
.faq-q{
  width:100%;
  text-align:left;
  background:transparent;
  border:none;
  padding:16px 20px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  font-family:inherit;
  line-height:1.6;
  transition:color .22s ease;
}
.faq-q:hover{color:var(--brand)}
.faq-q .icon{
  font-size:20px;
  color:var(--brand);
  transition:transform .3s ease;
  flex-shrink:0;
  line-height:1;
}
.faq-item.open .faq-q .icon{transform:rotate(45deg)}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .35s ease,padding .35s ease;
  padding:0 20px;
  font-size:15px;
  color:var(--text-soft);
}
.faq-item.open .faq-a{max-height:400px;padding:0 20px 18px}

/* ============ HowTo ============ */
.howto-step{
  display:flex;
  gap:16px;
  margin-bottom:20px;
  padding:14px 16px;
  border-radius:12px;
  background:var(--bg-glass);
  border:1px solid var(--glass-border);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
body.dark .howto-step{border-color:rgba(255,255,255,.08)}
.howto-step:hover{
  transform:translateX(4px);
  box-shadow:var(--shadow-sm);
  border-color:rgba(79,195,247,.45);
}
.step-num{
  flex-shrink:0;
  width:42px;height:42px;
  border-radius:50%;
  background:var(--accent-grad);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  font-size:18px;
  box-shadow:0 6px 16px rgba(26,111,212,.35);
}
.step-body h4{font-size:16px;margin-bottom:6px;color:var(--text)}
.step-body p{font-size:15px;color:var(--text-soft)}

/* ============ Case cards ============ */
.case-card{
  background:var(--bg-glass);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--glass-border);
  transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease;
}
body.dark .case-card{border-color:rgba(255,255,255,.08)}
.case-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-md);
  border-color:rgba(79,195,247,.45);
}
.case-card svg{
  width:100%;
  height:150px;
  transition:transform .5s ease;
}
.case-card:hover svg{transform:scale(1.05)}
.case-body{padding:20px}
.case-body h3{font-size:18px;margin-bottom:8px;line-height:1.5}
.case-body p{font-size:14px;color:var(--text-soft)}

/* ============ Testimonials ============ */
.testimonial{
  position:relative;
  background:linear-gradient(120deg,rgba(26,111,212,.08),rgba(79,195,247,.06));
  border-left:4px solid var(--brand);
  padding:20px 24px;
  border-radius:0 12px 12px 0;
  margin-bottom:16px;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:transform .25s ease,box-shadow .25s ease;
}
.testimonial:hover{transform:translateX(4px);box-shadow:var(--shadow-sm)}
.testimonial p{
  font-size:15px;
  color:var(--text-soft);
  font-style:italic;
  margin-bottom:8px;
}
.testimonial cite{
  font-size:14px;
  color:var(--brand);
  font-style:normal;
  font-weight:600;
}

/* ============ Contact ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.contact-info li{
  list-style:none;
  margin-bottom:12px;
  font-size:15px;
  display:flex;
  gap:10px;
  align-items:flex-start;
}
.contact-info .label{color:var(--text-mute);min-width:72px;flex-shrink:0}
.contact-form input,.contact-form textarea{
  width:100%;
  padding:11px 14px;
  border:1px solid #d1d5db;
  border-radius:10px;
  margin-bottom:12px;
  font-size:15px;
  font-family:inherit;
  background:var(--bg-alt);
  color:var(--text);
  transition:border-color .22s ease,box-shadow .22s ease,background .3s ease,color .3s ease;
}
body.dark .contact-form input,body.dark .contact-form textarea{border-color:#333a49}
.contact-form input:focus,.contact-form textarea:focus{
  outline:none;
  border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(26,111,212,.18);
}
.contact-form textarea{min-height:110px;resize:vertical}
.contact-form button{
  background:var(--accent-grad);
  color:#fff;
  border:none;
  padding:12px 30px;
  border-radius:10px;
  font-size:16px;
  font-weight:600;
  cursor:pointer;
  font-family:inherit;
  box-shadow:0 8px 20px rgba(26,111,212,.32);
  transition:transform .22s ease,box-shadow .22s ease,filter .22s ease;
}
.contact-form button:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(26,111,212,.45);filter:brightness(1.05)}
.contact-form button:active{transform:translateY(0) scale(.98)}

/* ============ Sitemap / friend links ============ */
.sitemap-list{columns:2;column-gap:32px;list-style:none}
.sitemap-list li{
  margin-bottom:8px;
  break-inside:avoid;
  font-size:15px;
}
.sitemap-list a{color:var(--brand);transition:padding-left .2s ease,color .2s ease}
.sitemap-list a:hover{padding-left:4px;text-decoration:none;color:var(--brand-dark)}

.friend-links{
  display:flex;
  flex-wrap:wrap;
  gap:10px 22px;
  list-style:none;
  font-size:14px;
}
.friend-links a{
  color:var(--text-soft);
  padding:4px 10px;
  border-radius:8px;
  border:1px solid var(--line);
  transition:color .22s ease,border-color .22s ease,transform .22s ease,background .22s ease;
}
.friend-links a:hover{
  color:var(--brand);
  border-color:rgba(26,111,212,.5);
  background:rgba(26,111,212,.06);
  text-decoration:none;
  transform:translateY(-2px);
}

/* ============ Tables ============ */
table.info-table{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
  margin:16px 0;
  border-radius:12px;
  overflow:hidden;
  box-shadow:var(--shadow-sm);
}
table.info-table th,table.info-table td{
  border:1px solid var(--line);
  padding:10px 14px;
  text-align:left;
}
table.info-table th{
  background:linear-gradient(120deg,rgba(26,111,212,.10),rgba(79,195,247,.08));
  font-weight:600;
  color:var(--text);
}
table.info-table tbody tr{transition:background .2s ease}
table.info-table tbody tr:hover{background:rgba(79,195,247,.08)}

/* ============ Author box ============ */
.author-box{
  background:linear-gradient(120deg,rgba(26,111,212,.10),rgba(79,195,247,.06));
  border:1px solid rgba(26,111,212,.18);
  border-radius:var(--radius);
  padding:22px;
  display:flex;
  gap:18px;
  align-items:flex-start;
  margin-top:20px;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.author-box svg{
  width:64px;height:64px;
  flex-shrink:0;
  border-radius:50%;
  box-shadow:0 6px 18px rgba(26,111,212,.3);
}
.author-box h4{font-size:16px;margin-bottom:6px;color:var(--text)}
.author-box p{font-size:14px;color:var(--text-soft)}

/* ============ Notice ============ */
.notice{
  position:relative;
  background:rgba(255,248,230,.9);
  border:1px solid #f5d98b;
  border-radius:10px;
  padding:14px 18px;
  font-size:14px;
  color:#7a5d00;
  margin:16px 0;
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
body.dark .notice{background:rgba(42,36,16,.9);border-color:#4a3f1a;color:#e0c86a}

/* ============ Footer ============ */
footer.site-footer{
  position:relative;
  background:var(--header-bg);
  color:#b8bcc8;
  padding:48px 0 20px;
  font-size:14px;
  transition:background .3s ease;
}
footer.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:var(--accent-grad);
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1.4fr;
  gap:32px;
  margin-bottom:32px;
}
.footer-grid h4{color:#fff;font-size:16px;margin-bottom:14px}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:8px}
.footer-grid a{color:#b8bcc8;transition:color .22s ease,padding-left .22s ease}
.footer-grid a:hover{color:var(--brand-light);text-decoration:none;padding-left:3px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  padding-top:20px;
  text-align:center;
  font-size:13px;
  color:#8b90a0;
}
.footer-bottom p{margin-bottom:6px}

/* ============ Back to top ============ */
.back-top{
  position:fixed;
  right:24px;
  bottom:28px;
  width:48px;height:48px;
  border-radius:50%;
  background:var(--accent-grad);
  color:#fff;
  border:none;
  font-size:20px;
  cursor:pointer;
  display:none;
  align-items:center;
  justify-content:center;
  box-shadow:0 6px 20px rgba(26,111,212,.45);
  z-index:999;
  transition:transform .25s ease,box-shadow .25s ease;
}
.back-top.show{display:flex;animation:popIn .3s ease both}
.back-top:hover{transform:translateY(-4px) scale(1.06);box-shadow:0 12px 28px rgba(26,111,212,.6)}
.back-top:active{transform:scale(.94)}

@keyframes popIn{
  from{opacity:0;transform:scale(.6)}
  to{opacity:1;transform:scale(1)}
}

/* ============ Scroll reveal ============ */
.reveal{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .6s ease,transform .6s ease;
  will-change:opacity,transform;
}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ============ Responsive ============ */
@media(max-width:960px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .article-list{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero-slide h1{font-size:28px}
  .section-title{font-size:24px}
}

@media(max-width:768px){
  nav.main-nav{
    display:none;
    position:absolute;
    top:100%;
    left:0;right:0;
    background:var(--header-bg);
    flex-direction:column;
    padding:12px;
    box-shadow:0 8px 20px rgba(0,0,0,.3);
    border-top:1px solid rgba(255,255,255,.08);
    animation:fadeIn .25s ease both;
  }
  nav.main-nav.open{display:flex}
  nav.main-nav a{padding:10px 14px}
  .menu-toggle{display:flex;align-items:center;justify-content:center}
  .search-box{display:none}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .sitemap-list{columns:1}
  .footer-grid{grid-template-columns:1fr}
  .hero-slide h1{font-size:24px}
  .hero-slide p{font-size:15px}
  .hero-slides{min-height:auto}
  .hero-slide{padding:52px 20px 64px}
  .section-title{font-size:22px}
  section.block{padding:42px 0}
  .howto-step{padding:12px}
  .author-box{flex-direction:column;align-items:center;text-align:center}
  .back-top{right:16px;bottom:18px;width:44px;height:44px}
}

@media(max-width:480px){
  .header-inner{padding:10px 14px;gap:10px}
  .brand{font-size:17px}
  .brand svg{width:30px;height:30px}
  .hero-slide h1{font-size:21px}
  .btn{padding:10px 20px;font-size:15px}
  .stat-num{font-size:26px}
  .card{padding:18px}
  .article-item{padding:18px}
  .section-title{font-size:20px}
}

/* ============ Reduced motion ============ */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none}
}

/* ============ Print ============ */
@media print{
  header.site-header,.hero,.back-top,.anchor-nav,.hero-dots,.contact-form{display:none !important}
  body{background:#fff;color:#000}
  section.block{padding:16px 0}
}