/* 南京致飞专利代理事务所 · 全站样式 */
:root{
  --brand:#111580; --brand-2:#2A2E99; --brand-hover:#3B41C4;
  --ink:#0E1030; --text:#23263A; --muted:#646A83;
  --soft:#F5F6FC; --soft-2:#EDF0F9; --line:#E3E5F2;
  --gold:#B98A1E; --gold-light:#F0C75E; --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;color:var(--text);background:#fff;line-height:1.75;font-size:16px}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}

.demo-bar{background:#F2F4FB;color:#4A5170;font-size:13px;text-align:center;padding:7px 36px;position:relative;border-bottom:1px solid #E2E6F2}
.demo-bar .dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#7A83A8;margin-right:7px;vertical-align:middle}
.demo-bar button{position:absolute;right:12px;top:6px;background:none;border:none;color:#8A90AC;cursor:pointer;font-size:15px}

/* ---------- header (白底，配合深蓝 logo) ---------- */
header{background:#fff;position:sticky;top:0;z-index:60;border-bottom:1px solid var(--line);transition:box-shadow .25s}
header.scrolled{box-shadow:0 4px 18px rgba(20,22,60,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;gap:20px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand img{height:50px;width:auto}
.brand .name{color:var(--ink);font-size:15px;font-weight:600;line-height:1.35;letter-spacing:.3px}
.brand .name small{display:block;font-size:10px;font-weight:400;color:#8B90AE;letter-spacing:1px}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:#3A3E55;font-size:14.5px;transition:color .18s;white-space:nowrap;padding:6px 0;position:relative}
.nav-links a:hover{color:var(--brand-2)}
.nav-links a.current{color:var(--brand);font-weight:600}
.nav-links a.current::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--brand);border-radius:2px}
.nav-cta{background:var(--brand);color:#fff !important;padding:10px 22px;border-radius:8px;font-size:14.5px !important;font-weight:500}
.nav-cta:hover{background:var(--brand-hover);color:#fff !important}
.burger{display:none;background:none;border:none;cursor:pointer;padding:6px}
.burger span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;border-radius:2px}

/* ---------- hero ---------- */
.hero{background:#0E1030;color:#fff;position:relative;overflow:hidden}
.hero-slides{display:grid}
.hero-slide{grid-area:1/1;position:relative;overflow:hidden;padding:96px 0 112px;opacity:0;visibility:hidden;transition:opacity .65s ease,visibility .65s}
.hero-slide.on{opacity:1;visibility:visible}
.hero-slide[data-i="0"]{background:linear-gradient(155deg,#0E1030 0%,#171A66 55%,#2A2E99 100%)}
.hero-slide[data-i="1"]{background:linear-gradient(150deg,#0A1038 0%,#132C7C 52%,#1D55AE 100%)}
.hero-slide[data-i="2"]{background:linear-gradient(160deg,#11102E 0%,#2A2270 50%,#4636A6 100%)}
.hero-slide::after{content:"";position:absolute;border-radius:50%}
.hero-slide[data-i="0"]::after{right:-150px;top:-160px;width:500px;height:500px;background:radial-gradient(circle,rgba(110,120,240,.30),transparent 66%)}
.hero-slide[data-i="1"]::after{right:-130px;bottom:-230px;width:560px;height:560px;background:radial-gradient(circle,rgba(96,196,236,.26),transparent 66%)}
.hero-slide[data-i="2"]::after{left:-190px;top:-150px;width:520px;height:520px;background:radial-gradient(circle,rgba(240,199,94,.20),transparent 66%)}
.hero-slide .wrap{position:relative;z-index:1}
.hs-arrow{position:absolute;top:50%;margin-top:-22px;z-index:6;width:44px;height:44px;border-radius:50%;border:1px solid rgba(255,255,255,.34);background:rgba(255,255,255,.10);color:#fff;font-size:26px;line-height:1;cursor:pointer;transition:.2s;font-family:Arial,sans-serif}
.hs-arrow:hover{background:rgba(255,255,255,.22)}
.hs-arrow.prev{left:22px}
.hs-arrow.next{right:22px}
.hs-dots{position:absolute;left:0;right:0;bottom:38px;z-index:6;display:flex;justify-content:center;gap:10px}
.hs-dots button{width:26px;height:4px;padding:0;border:none;border-radius:99px;background:rgba(255,255,255,.34);cursor:pointer;transition:.28s}
.hs-dots button.on{background:var(--gold-light);width:46px}
@media(max-width:820px){
  .hs-arrow{display:none}
  .hero-slide{padding:62px 0 92px}
  .hs-dots{bottom:30px}
}
.kicker{display:inline-block;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.26);color:#E2E4F7;font-size:13px;padding:6px 16px;border-radius:99px;margin-bottom:22px;letter-spacing:1.5px}
.hero h1{font-size:43px;line-height:1.32;font-weight:700;max-width:820px}
.hero h1 em{font-style:normal;color:var(--gold-light)}
.hero p.sub{margin-top:20px;font-size:17px;color:#C9CCE9;max-width:700px}
.hero-actions{margin-top:34px;display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 30px;border-radius:9px;font-size:15.5px;font-weight:600;transition:.2s}
.btn-gold{background:var(--gold-light);color:#3A2E08}
.btn-gold:hover{background:#F7D67F}
.btn-ghost{border:1px solid rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.hero-trust{margin-top:44px;display:flex;gap:32px;flex-wrap:wrap;color:#AFB3DA;font-size:13.5px}
.hero-trust span::before{content:"✓";color:var(--gold-light);margin-right:8px;font-weight:700}

/* ---------- 内页 banner ---------- */
.page-hero{background:linear-gradient(140deg,#0E1030 0%,#1B1E72 100%);color:#fff;padding:62px 0 66px}
.page-hero h1{font-size:34px;font-weight:700;line-height:1.35;max-width:800px}
.page-hero p{margin-top:14px;color:#C4C8EA;font-size:16px;max-width:720px}
.crumb{font-size:13px;color:#979BC8;margin-bottom:16px}
.crumb a{color:#C4C8EA}
.crumb span{margin:0 8px;color:#5F6394}

/* ---------- sections ---------- */
section{padding:80px 0}
section.alt{background:var(--soft)}
.sec-head{max-width:760px;margin:0 auto 50px;text-align:center}
.sec-head.left{margin-left:0;text-align:left}
.sec-tag{color:var(--brand);font-size:13px;font-weight:600;letter-spacing:2px}
.sec-head h2{font-size:30px;color:var(--ink);margin-top:10px;font-weight:700}
.sec-head p{color:var(--muted);margin-top:13px;font-size:15.5px}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:52px;align-items:center}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;transition:.22s}
.card:hover{border-color:#BFC3EC;transform:translateY(-4px);box-shadow:0 12px 30px rgba(30,35,110,.07)}
.card .no{font-size:12.5px;font-weight:700;color:var(--brand);letter-spacing:1.5px;margin-bottom:12px}
.card h3{font-size:19px;color:var(--ink);margin-bottom:11px;font-weight:600}
.card p{font-size:14px;color:var(--muted);margin-bottom:15px}
.card ul{list-style:none;display:grid;gap:7px;font-size:13.5px;color:#43475E}
.card li::before{content:"·";color:var(--brand);font-weight:900;margin-right:8px}
.card.star{border:2px solid var(--brand);position:relative;overflow:hidden}
.card .flag{position:absolute;top:0;right:0;background:var(--brand);color:#fff;font-size:11.5px;padding:5px 12px;border-radius:0 0 0 10px}

.checklist{list-style:none;display:grid;gap:14px;margin-top:22px}
.checklist li{display:flex;gap:13px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 20px}
.checklist .tick{min-width:23px;height:23px;border-radius:50%;background:var(--soft-2);color:var(--brand);font-size:13px;display:flex;align-items:center;justify-content:center;font-weight:700;margin-top:1px}
.checklist b{color:var(--ink);font-size:15.5px;display:block}
.checklist span{font-size:13.6px;color:var(--muted)}

.infobox{background:#fff;border-left:4px solid var(--gold-light);border-radius:0 12px 12px 0;padding:18px 22px;margin-top:24px;font-size:13.8px;color:var(--muted)}
.infobox b{color:#7A5A10}

/* 定价 */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.plan{border:1px solid var(--line);border-radius:16px;padding:32px 28px;display:flex;flex-direction:column;background:#fff;position:relative}
.plan.hot{border:2px solid var(--brand);box-shadow:0 12px 34px rgba(42,46,153,.13)}
.plan .badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--brand);color:#fff;font-size:12px;padding:4px 16px;border-radius:99px}
.plan h3{font-size:18px;color:var(--ink)}
.plan .price{font-size:31px;font-weight:700;color:var(--brand);margin:14px 0 2px}
.plan .price small{font-size:13px;color:var(--muted);font-weight:400}
.plan .cycle{font-size:13px;color:var(--muted);margin-bottom:18px}
.plan ul{list-style:none;display:grid;gap:10px;font-size:14px;margin-bottom:26px}
.plan li::before{content:"·";color:var(--brand);font-weight:900;margin-right:8px}
.plan .btn{margin-top:auto;text-align:center}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:var(--brand-hover)}
.btn-line{border:1.5px solid var(--brand);color:var(--brand)}
.btn-line:hover{background:var(--soft)}
.price-foot{text-align:center;color:var(--muted);font-size:13.5px;margin-top:24px}

/* 流程 tab */
.tabs{display:flex;gap:10px;justify-content:center;margin-bottom:34px;flex-wrap:wrap}
.tab{padding:10px 24px;border:1.5px solid var(--line);background:#fff;border-radius:99px;cursor:pointer;font-size:14.5px;color:var(--muted);transition:.2s}
.tab.on{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.panel{display:none}
.panel.on{display:block}
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:s}
.steps.four{grid-template-columns:repeat(4,1fr)}
.step{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);border-radius:12px;padding:24px 18px}
.step::before{counter-increment:s;content:"0" counter(s);font-size:25px;font-weight:700;color:var(--gold-light);display:block;margin-bottom:9px}
.step h3{font-size:15px;margin-bottom:7px;font-weight:600;color:#fff}
.step p{font-size:12.8px;color:#AFB3DA}
.process{background:var(--ink);color:#fff}
.process .sec-head h2{color:#fff}
.process .sec-head p{color:#AFB3DA}
.step.light{background:var(--soft);border-color:var(--line)}
.step.light h3{color:var(--ink)}
.step.light p{color:var(--muted)}
.step.light::before{color:var(--brand)}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto;display:grid;gap:12px}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 24px}
details[open]{border-color:#BFC3EC}
summary{cursor:pointer;padding:19px 0;font-size:15.3px;font-weight:600;color:var(--ink);list-style:none;position:relative;padding-right:30px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:2px;top:16px;font-size:20px;color:var(--brand);font-weight:400}
details[open] summary::after{content:"−"}
details .ans{padding:0 0 20px;color:var(--muted);font-size:14.2px}

/* CTA band */
.cta-band{background:linear-gradient(120deg,#171A66,#2A2E99);color:#fff;text-align:center;padding:66px 0}
.cta-band h2{font-size:29px;font-weight:700}
.cta-band p{color:#C4C8EA;margin:14px 0 28px;font-size:16px}

/* 轮播底部 加V免费查新 二维码（窄卡） */
.hero-qr{position:absolute;right:42px;bottom:30px;z-index:5;background:#fff;border-radius:14px;padding:10px 12px 9px;text-align:center;
  box-shadow:0 10px 28px rgba(0,0,15,.32);outline:2px solid rgba(240,199,94,.55);outline-offset:-5px;width:148px}
.hero-qr img{width:120px;height:120px;border-radius:5px;display:block;margin:0 auto}
.hero-qr .q-cap{margin-top:7px;font-size:14.5px;font-weight:800;color:var(--brand)}
.hero-qr .q-sub{margin-top:1px;font-size:11px;color:#646A83;letter-spacing:.3px}
@media(max-width:820px){ .hero-qr{display:none} }

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start}
.c-row{display:flex;gap:16px;align-items:flex-start;padding:13px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.c-row .lab{min-width:74px;color:var(--muted);font-size:13px}
.c-form{background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:32px}
.c-form h3{font-size:17px;color:var(--ink);margin-bottom:18px}
.c-form label{display:block;font-size:13px;color:var(--muted);margin:14px 0 6px}
.c-form input,.c-form select,.c-form textarea{width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:9px;font-size:14px;font-family:inherit;background:#fff;color:var(--text)}
.c-form textarea{resize:vertical;min-height:84px}
.c-form button{width:100%;margin-top:20px;padding:13px;border:none;border-radius:9px;background:var(--brand);color:#fff;font-size:15px;font-weight:600;cursor:pointer}
.c-form button:hover{background:var(--brand-hover)}

/* 联系页 · 加V免费查新 二维码卡 */
.c-qr{background:#fff;border:1px solid var(--line);border-radius:16px;padding:34px 32px 30px;text-align:center}
.c-qr h3{font-size:19px;color:var(--ink);margin-bottom:10px}
.c-qr-lead{font-size:13.5px;color:var(--muted);line-height:1.75;margin-bottom:20px}
.c-qr img{width:184px;height:184px;border-radius:8px;display:block;margin:0 auto;box-shadow:0 6px 18px rgba(0,0,15,.14)}
.c-qr .q-cap{margin-top:15px;font-size:18px;font-weight:800;color:var(--brand)}
.c-qr .q-sub{margin-top:3px;font-size:12.5px;color:#646A83;letter-spacing:.3px}
.c-qr-tel{display:inline-block;margin-top:18px;padding:12px 26px;border-radius:9px;background:var(--brand);color:#fff;font-size:14.5px;font-weight:600;text-decoration:none}
.c-qr-tel:hover{background:var(--brand-hover)}
.c-qr-note{margin-top:16px;font-size:12px;color:var(--muted);line-height:1.7}
.form-tip{font-size:12px;color:#9BA0B5;margin-top:12px;text-align:center}

/* table */
.tbl-wrap{overflow-x:auto;margin-top:26px}
table{border-collapse:collapse;width:100%;background:#fff;font-size:14px;min-width:560px}
th,td{border:1px solid var(--line);padding:13px 16px;text-align:left}
th{background:var(--soft-2);color:var(--ink);font-weight:600;font-size:13.5px}
td{color:#41455E}


/* footer */
footer{background:var(--ink);color:#8B8FB5;padding:52px 0 32px;font-size:13px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px;margin-bottom:30px}
.foot-brand img{height:46px;margin-bottom:12px}
.foot-brand p{line-height:1.85}
.foot-col h4{color:#D9DBEE;font-size:14px;margin-bottom:14px;font-weight:600}
.foot-col a{display:block;padding:4px 0;color:#8B8FB5;transition:color .18s}
.foot-col a:hover{color:#fff}
.disclaim{border-top:1px solid rgba(255,255,255,.12);padding-top:22px;font-size:12px;line-height:1.9;color:#6E729A}

@media(max-width:1000px){
  .hero h1{font-size:32px}
  .page-hero h1{font-size:27px}
  .grid-3,.price-grid{grid-template-columns:1fr 1fr}
  .steps,.steps.four{grid-template-columns:1fr 1fr}
  .split,.contact-grid,.grid-2{grid-template-columns:1fr;gap:32px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{position:fixed;inset:76px 0 auto 0;background:#fff;flex-direction:column;align-items:flex-start;padding:20px 24px 26px;gap:16px;display:none;max-height:calc(100vh - 76px);overflow-y:auto;border-bottom:1px solid var(--line);box-shadow:0 10px 24px rgba(20,22,60,.08)}
  .nav-links.open{display:flex}
  .nav-links a{font-size:15.5px;color:var(--ink)}
  .nav-links a.current::after{display:none}
  .burger{display:block}
}
@media(max-width:600px){
  .grid-3,.price-grid,.steps,.steps.four,.foot-grid{grid-template-columns:1fr}
  section{padding:56px 0}
  .hero{padding:64px 0 74px}
  .hero-trust{gap:16px}
}