:root{
  --ink:#101532;
  --ink2:#1b2249;
  --body:#4e5877;
  --muted:#5d6788;
  --line:rgba(23,32,74,.09);
  --violet:#5b3cff;
  --blue:#0e8fe0;
  --pink:#e0249f;
  --grad:linear-gradient(100deg,#5b3cff,#0e8fe0 58%,#e0249f);
  --shadow-s:0 8px 22px rgba(28,38,94,.06);
  --shadow-m:0 14px 34px rgba(28,38,94,.09);
  --shadow-l:0 20px 50px rgba(76,60,220,.16);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:86px;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.7;
  color:var(--ink);
  background-color:#f6f8ff;
  background-image:
    radial-gradient(760px 420px at 6% -4%, rgba(109,91,255,.20), transparent 62%),
    radial-gradient(700px 420px at 94% 2%, rgba(0,190,255,.16), transparent 62%),
    radial-gradient(900px 520px at 50% 40%, rgba(255,47,185,.07), transparent 66%),
    radial-gradient(760px 480px at 8% 80%, rgba(0,190,255,.11), transparent 62%),
    radial-gradient(820px 520px at 92% 96%, rgba(109,91,255,.14), transparent 62%);
  background-attachment:fixed;
  background-repeat:no-repeat;
  overflow-x:hidden;
}
img{max-width:100%}
a{color:inherit}
h1,h2,h3,h4{color:var(--ink);margin:0}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
section{padding:66px 0}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:12px;font-size:15px;font-weight:600;text-decoration:none;border:1px solid transparent;cursor:pointer;font-family:inherit;white-space:nowrap;transition:transform .25s ease,box-shadow .25s ease,background .25s ease,color .25s ease,border-color .25s ease}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 12px 26px rgba(91,60,255,.30)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 36px rgba(91,60,255,.38)}
.btn-ghost{background:#fff;color:var(--ink2);border-color:rgba(23,32,74,.13);box-shadow:var(--shadow-s)}
.btn-ghost:hover{transform:translateY(-2px);border-color:rgba(91,60,255,.42);color:#3a2bd0}
.btn-line{background:rgba(255,255,255,.5);color:#3a2bd0;border-color:rgba(91,60,255,.34)}
.btn-line:hover{background:rgba(91,60,255,.09);transform:translateY(-2px)}
.btn-sm{padding:9px 16px;font-size:13.5px;border-radius:10px}
.btn:active{transform:translateY(0) scale(.985)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.84);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:14px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto}
.ai-page-logo{width:38px;height:38px;object-fit:contain;border-radius:10px;display:block}
.brand-name{font-size:17px;font-weight:800;letter-spacing:.4px;color:#101532;white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:0;margin-left:auto;flex-wrap:nowrap}
.nav-links a{padding:9px 10px;font-size:14px;color:#2b3255;text-decoration:none;border-radius:10px;white-space:nowrap;transition:color .25s ease,background .25s ease}
.nav-links a:hover{color:#3a2bd0;background:rgba(91,60,255,.09)}
.nav-actions{display:flex;align-items:center;gap:10px;margin-left:8px}
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:42px;height:42px;padding:0;border-radius:12px;border:1px solid rgba(23,32,74,.13);background:#fff;cursor:pointer}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:#1a2145;transition:transform .3s ease,opacity .3s ease}

/* ---------- hero ---------- */
.hero{padding:56px 0 10px;position:relative;overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.06fr .94fr;gap:40px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;background:rgba(91,60,255,.10);border:1px solid rgba(91,60,255,.20);color:#4a34d6;font-size:13px;font-weight:700;letter-spacing:.4px}
.hero h1{font-size:clamp(30px,4.4vw,52px);line-height:1.18;letter-spacing:-1px;font-weight:800;color:#0e1330;margin-top:18px}
.hero h1::after{content:"";display:block;width:78px;height:6px;border-radius:99px;background:var(--grad);margin-top:20px}
.hero-lead{margin:22px 0 28px;max-width:600px;font-size:16.5px;line-height:1.85;color:#49536f}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-points{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:26px}
.hero-points li{display:flex;align-items:center;gap:8px;font-size:14px;color:#3a4266}
.hero-points li::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--grad);flex:0 0 8px}
.hero-visual{position:relative;min-height:370px;display:grid;place-items:center}
.ring{position:absolute;border-radius:50%}
.ring-a{width:238px;height:238px;border:1px dashed rgba(91,60,255,.34);animation:spin 30s linear infinite}
.ring-b{width:318px;height:318px;border:1px dashed rgba(0,190,255,.34);animation:spin 44s linear infinite reverse}
.ring-c{width:388px;height:388px;border:1px solid rgba(91,60,255,.12)}
.core{width:150px;height:150px;border-radius:50%;background:linear-gradient(140deg,#5b3cff,#0e8fe0 55%,#e0249f);box-shadow:0 0 70px rgba(91,60,255,.42);position:relative;animation:breathe 5s ease-in-out infinite}
.core::after{content:"";position:absolute;inset:16px;border-radius:50%;background:radial-gradient(circle at 34% 28%, rgba(255,255,255,.9), rgba(255,255,255,0) 62%)}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.07)}}

/* ---------- metrics ---------- */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:46px}
.metric{background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:16px;padding:20px 16px;text-align:center;box-shadow:var(--shadow-s);backdrop-filter:blur(6px);transition:transform .3s ease,box-shadow .3s ease}
.metric:hover{transform:translateY(-3px);box-shadow:var(--shadow-m)}
.metric strong{display:block;font-size:26px;font-weight:800;letter-spacing:-.5px;color:#141a3f;line-height:1.2}
.metric strong.stars{font-size:18px;letter-spacing:3px;color:#f2a114}
.metric span{display:block;font-size:13.5px;color:var(--muted);margin-top:6px}

/* ---------- section head ---------- */
.section-head{max-width:780px;margin:0 auto 38px;text-align:center}
.section-head h2{font-size:clamp(23px,3vw,34px);line-height:1.32;letter-spacing:-.4px;margin:16px 0 12px;color:#0e1330}
.section-head p{font-size:15.5px;color:var(--muted);line-height:1.8}
.section-head.left{margin-left:0;text-align:left}

/* ---------- cards & grids ---------- */
.grid{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow-s);transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 46px rgba(76,60,220,.15);border-color:rgba(91,60,255,.24)}
.card h3{font-size:17px;line-height:1.45;color:#131a3d;margin-bottom:8px}
.card p{font-size:14.5px;color:var(--muted);line-height:1.72}
.tick{display:block;width:34px;height:4px;border-radius:99px;background:var(--grad);margin-bottom:14px}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(248px,1fr));gap:18px}

/* ---------- studio ---------- */
.studio-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}
.studio-copy h2{font-size:clamp(23px,3vw,32px);line-height:1.34;letter-spacing:-.4px;margin:16px 0 14px;color:#0e1330}
.studio-copy > p{font-size:15.5px;color:var(--muted);line-height:1.82}
.steps{display:grid;gap:14px;margin-top:24px}
.step{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;box-shadow:var(--shadow-s);transition:transform .3s ease,box-shadow .3s ease}
.step:hover{transform:translateY(-3px);box-shadow:var(--shadow-m)}
.step-no{flex:0 0 32px;width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,#5b3cff,#0e8fe0);color:#fff;font-size:13.5px;font-weight:700;display:flex;align-items:center;justify-content:center}
.step h3{font-size:15.5px;margin-bottom:4px;color:#131a3d}
.step p{font-size:14px;color:var(--muted);line-height:1.68}
.shot-list{display:grid;gap:16px}
.shot{background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow-m)}
.shot img{display:block;width:100%;height:auto;border-radius:12px}

/* ---------- case ---------- */
.case-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;align-items:start}
.case-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow-s);transition:transform .3s ease,box-shadow .3s ease}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-l)}
.case-thumb{border-radius:13px;overflow:hidden;background:#eef1fd}
.case-thumb img{display:block;width:100%;height:auto}
.case-card h3{font-size:15px;margin:12px 4px 4px;color:#131a3d}
.case-card p{font-size:13.5px;color:var(--muted);margin:0 4px 6px;line-height:1.6}

/* ---------- review ---------- */
.review-head{display:flex;flex-wrap:wrap;align-items:center;gap:26px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow-m);margin-bottom:24px}
.score{flex:0 0 auto;width:120px;height:120px;border-radius:50%;background:linear-gradient(135deg,#5b3cff,#0e8fe0 58%,#e0249f);color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 16px 34px rgba(91,60,255,.30);text-align:center}
.score strong{font-size:34px;line-height:1;font-weight:800}
.score span{font-size:12px;opacity:.92;margin-top:8px}
.review-info{flex:1 1 320px;min-width:240px}
.review-info h3{font-size:20px;margin-bottom:10px;color:#131a3d}
.review-info p{font-size:15px;color:var(--muted);line-height:1.8}
.stars{display:inline-block;margin-top:12px;font-size:18px;letter-spacing:4px;color:#f2a114}
.table-wrap{overflow-x:auto;border-radius:18px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow-m)}
.cmp-table{width:100%;border-collapse:collapse;min-width:660px;font-size:14.5px}
.cmp-table th,.cmp-table td{padding:14px 16px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);line-height:1.65}
.cmp-table thead th{background:#f5f6ff;color:#2b3255;font-size:13.5px;font-weight:700;white-space:nowrap}
.cmp-table tbody tr:last-child td{border-bottom:0}
.cmp-table tbody tr:hover{background:#fafbff}
.cmp-table td:first-child{font-weight:600;color:#1b2249;white-space:nowrap}
.cmp-table .col-us{background:rgba(91,60,255,.06);color:#3a2bd0;font-weight:600}

/* ---------- form ---------- */
.match-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:32px;align-items:start}
.match-copy h2{font-size:clamp(23px,3vw,32px);line-height:1.34;letter-spacing:-.4px;margin:16px 0 14px;color:#0e1330}
.match-copy p{font-size:15.5px;color:var(--muted);line-height:1.82}
.match-list{display:grid;gap:12px;margin-top:22px}
.match-list li{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:#39415f;background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px 16px;box-shadow:var(--shadow-s)}
.match-list li::before{content:"";flex:0 0 8px;width:8px;height:8px;border-radius:50%;background:var(--grad);margin-top:8px}
.form-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow-m)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:7px}
.field.full{grid-column:1 / -1}
.field label{font-size:13.5px;font-weight:600;color:#2b3255}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1px solid rgba(23,32,74,.15);border-radius:12px;background:#fbfcff;color:#161c3d;font-size:14.5px;font-family:inherit;line-height:1.5;transition:border-color .25s ease,box-shadow .25s ease,background .25s ease}
.field textarea{resize:vertical;min-height:110px}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:#6d5bff;background:#fff;box-shadow:0 0 0 4px rgba(91,60,255,.14)}
.form-note{font-size:13px;color:var(--muted);margin-top:14px;line-height:1.7}

/* ---------- token ---------- */
.token-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.price-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow-s);transition:transform .3s ease,box-shadow .3s ease}
.price-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-m)}
.price-card h3{font-size:17px;margin-bottom:10px;color:#131a3d}
.price-card p{font-size:14.5px;color:var(--muted);line-height:1.72}
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.tag{display:inline-block;padding:7px 14px;border-radius:999px;background:#fff;border:1px solid rgba(23,32,74,.11);font-size:13.5px;color:#333c62;box-shadow:0 4px 12px rgba(28,38,94,.05);transition:transform .25s ease,color .25s ease,border-color .25s ease,box-shadow .25s ease}
.tag:hover{transform:translateY(-2px);color:#3a2bd0;border-color:rgba(91,60,255,.4);box-shadow:0 10px 22px rgba(91,60,255,.16)}

/* ---------- reviews ---------- */
.reviews-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.review-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow-s);display:flex;flex-direction:column;gap:14px;transition:transform .3s ease,box-shadow .3s ease}
.review-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-m)}
.review-text{font-size:14.5px;color:#414a6b;line-height:1.8}
.review-user{display:flex;align-items:center;gap:12px;margin-top:auto}
.avatar{flex:0 0 40px;width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,rgba(91,60,255,.9),rgba(0,180,230,.9));color:#fff;font-size:15px;font-weight:700;display:flex;align-items:center;justify-content:center}
.review-user strong{display:block;font-size:14.5px;color:#131a3d;line-height:1.4}
.review-user span{display:block;font-size:12.5px;color:var(--muted)}

/* ---------- knowledge ---------- */
.knowledge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-bottom:26px}
.k-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow-s)}
.k-card h3{font-size:16.5px;margin-bottom:12px;color:#131a3d}
.k-card ul{display:grid;gap:9px}
.k-card li{font-size:14px;color:#4e5877;display:flex;gap:9px;align-items:flex-start;line-height:1.65}
.k-card li::before{content:"";flex:0 0 6px;width:6px;height:6px;border-radius:50%;background:var(--grad);margin-top:9px}
.article-list{display:grid;gap:12px}
.article-item{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px 20px;background:#fff;border:1px solid var(--line);border-radius:14px;text-decoration:none;box-shadow:var(--shadow-s);transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease}
.article-item:hover{transform:translateX(4px);box-shadow:var(--shadow-m);border-color:rgba(91,60,255,.26)}
.article-item span{font-size:15px;color:#141a3f;font-weight:600;line-height:1.6}
.article-item i{flex:0 0 auto;font-style:normal;font-size:13.5px;color:#3a2bd0;font-weight:600}

/* ---------- faq ---------- */
.faq-list{background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow-m)}
.faq-item + .faq-item{border-top:1px solid var(--line)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;padding:18px 22px;border:0;background:transparent;font-family:inherit;font-size:15.5px;font-weight:600;color:#141a3f;text-align:left;cursor:pointer;line-height:1.6;transition:background .25s ease,color .25s ease}
.faq-q:hover{background:#f7f8ff;color:#3a2bd0}
.faq-icon{position:relative;flex:0 0 16px;width:16px;height:16px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:#5b3cff;border-radius:2px;transition:transform .3s ease,opacity .3s ease}
.faq-icon::before{top:7px;left:0;width:16px;height:2px}
.faq-icon::after{left:7px;top:0;width:2px;height:16px}
.faq-item.open .faq-icon::after{transform:rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .38s ease}
.faq-item.open .faq-a{max-height:320px}
.faq-a p{padding:0 22px 20px;font-size:14.5px;color:#4e5877;line-height:1.8}

/* ---------- join ---------- */
.join-panel{position:relative;overflow:hidden;border-radius:24px;padding:44px 34px;background:linear-gradient(112deg,#3a2bd0,#0e8fe0 52%,#c01f8b);box-shadow:0 24px 56px rgba(58,43,208,.28);text-align:center;color:#fff}
.join-panel::after{content:"";position:absolute;width:340px;height:340px;right:-120px;top:-140px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.34),rgba(255,255,255,0) 68%)}
.join-panel h2{position:relative;color:#fff;font-size:clamp(22px,2.8vw,30px);line-height:1.35;letter-spacing:-.3px}
.join-panel p{position:relative;margin:14px auto 26px;max-width:720px;font-size:15.5px;line-height:1.85;color:rgba(255,255,255,.94)}
.join-cta{position:relative;display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.btn-light{background:#fff;color:#3a2bd0;box-shadow:0 12px 26px rgba(12,20,60,.20)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 18px 34px rgba(12,20,60,.26)}
.btn-outline-light{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.6)}
.btn-outline-light:hover{background:rgba(255,255,255,.24);transform:translateY(-2px)}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:start}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow-m)}
.contact-card h3{font-size:18px;margin-bottom:8px;color:#131a3d}
.contact-card > p{font-size:14.5px;color:var(--muted);line-height:1.75;margin-bottom:20px}
.contact-list{display:grid;gap:12px}
.contact-list li{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:baseline;padding:13px 16px;background:#f8f9ff;border:1px solid var(--line);border-radius:12px;font-size:14.5px;color:#39415f}
.contact-list li b{font-weight:600;color:#1b2249;flex:0 0 84px}
.contact-list li a{color:#3a2bd0;text-decoration:none;font-weight:600}
.contact-list li a:hover{text-decoration:underline}
.qr-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:var(--shadow-m);text-align:center}
.qr-card img{display:block;width:100%;max-width:230px;height:auto;margin:0 auto 14px;border-radius:14px;border:1px solid var(--line)}
.qr-card p{font-size:14px;color:var(--muted);line-height:1.75}
.qr-card strong{display:block;font-size:16px;color:#131a3d;margin-bottom:10px}

/* ---------- footer ---------- */
.site-footer{margin-top:0;padding:38px 0 26px;background:#f2f5ff;border-top:1px solid var(--line);color:#2b3255}
.footer-top{display:flex;flex-wrap:wrap;gap:28px;justify-content:space-between;align-items:flex-start}
.footer-brand{flex:1 1 260px;display:flex;gap:12px;align-items:flex-start}
.footer-brand .ai-page-logo{width:36px;height:36px}
.footer-brand strong{display:block;font-size:16px;color:#141a3f;margin-bottom:6px}
.footer-brand p{font-size:13.5px;color:#5d6788;line-height:1.7}
.footer-friend{flex:1 1 420px}
.footer-title{display:block;font-size:14px;font-weight:700;color:#141a3f;margin-bottom:12px}
.friend-links{display:flex;flex-wrap:wrap;gap:10px 18px}
.friend-links a{font-size:13.5px;color:#3a4266;text-decoration:none;transition:color .25s ease}
.friend-links a:hover{color:#3a2bd0}
.footer-bottom{display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;align-items:center;margin-top:26px;padding-top:18px;border-top:1px solid rgba(23,32,74,.10);font-size:13px;color:#5d6788}
.footer-bottom a{color:#3a2bd0;text-decoration:none;font-weight:600}
.footer-bottom a:hover{text-decoration:underline}

/* ---------- float ---------- */
.float-service{position:fixed;right:18px;bottom:86px;z-index:70}
.float-service a{display:flex;align-items:center;justify-content:center;width:54px;height:54px;border-radius:16px;background:linear-gradient(135deg,#5b3cff,#0e8fe0);color:#fff;font-size:13px;font-weight:700;text-decoration:none;letter-spacing:1px;box-shadow:0 14px 30px rgba(91,60,255,.36);transition:transform .25s ease,box-shadow .25s ease}
.float-service a:hover{transform:translateY(-3px);box-shadow:0 20px 38px rgba(91,60,255,.44)}
.back-top{position:fixed;right:18px;bottom:22px;z-index:70;width:54px;height:54px;border:1px solid rgba(23,32,74,.12);border-radius:16px;background:#fff;color:#1b2249;font-size:18px;font-weight:700;cursor:pointer;box-shadow:var(--shadow-m);opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .3s ease,transform .3s ease,box-shadow .25s ease}
.back-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.back-top:hover{box-shadow:var(--shadow-l);color:#3a2bd0}

/* ---------- fx ---------- */
.js .fx{opacity:0;transform:translateY(20px);transition:opacity .7s ease,transform .7s ease}
.js .fx.in{opacity:1;transform:translateY(0)}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .nav-links a{font-size:13px;padding:8px 7px}
  .case-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:980px){
  .nav-toggle{display:flex}
  .nav-links{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;margin-left:0;padding:6px 16px 14px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 22px 40px rgba(28,38,94,.12);max-height:0;overflow:hidden;opacity:0;pointer-events:none;transition:max-height .35s ease,opacity .25s ease}
  .nav-links.open{max-height:72vh;overflow-y:auto;opacity:1;pointer-events:auto}
  .nav-links a{padding:12px 10px;font-size:15px;border-radius:10px}
  .hero-inner{grid-template-columns:1fr;gap:26px}
  .hero-visual{min-height:300px}
  .ring-a{width:190px;height:190px}
  .ring-b{width:252px;height:252px}
  .ring-c{width:310px;height:310px}
  .core{width:126px;height:126px}
  .studio-grid,.match-grid,.contact-grid{grid-template-columns:1fr}
  .reviews-grid,.knowledge-grid,.token-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:820px){
  .metrics{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  section{padding:52px 0}
}
@media (max-width:620px){
  body{font-size:15.5px}
  .grid-3,.grid-2,.reviews-grid,.knowledge-grid,.token-grid,.case-grid,.form-grid{grid-template-columns:1fr}
  .nav-actions .btn-sm{padding:8px 12px;font-size:12.5px}
  .hero{padding:38px 0 6px}
  .hero-cta .btn{flex:1 1 auto}
  .review-head{padding:22px}
  .score{width:96px;height:96px}
  .score strong{font-size:28px}
  .join-panel{padding:32px 20px}
  .footer-top{gap:20px}
  .article-item{align-items:flex-start;flex-direction:column;gap:6px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001s !important;animation-iteration-count:1 !important;transition-duration:.001s !important}
  html{scroll-behavior:auto}
}