/* ============ FAQ 知识库 共享样式 ============ */
/* 沿用首页设计 token，保持视觉一致 */
:root{
  --text:#0f1631;--text-2:#5a6480;--text-3:#8c96af;--line:#edf1fb;
  --primary:#4f6bff;--primary-2:#7a4dff;--primary-3:#3b82f6;--accent:#06b6d4;
  --hobby:#f59e0b;--hobby-2:#ef4444;
  --primary-soft:rgba(79,107,255,.08);
  --card-bg:rgba(255,255,255,.85);
  --shadow-card:0 10px 30px rgba(99,118,255,.08);
  --shadow-soft:0 6px 20px rgba(99,118,255,.06);
  --shadow-header:0 4px 18px rgba(31,51,120,.05);
  --shadow-hover:0 24px 50px rgba(99,118,255,.18);
  --container-w:1258px;--radius-md:12px;--radius-lg:18px;--radius-xl:22px;
  --ease:cubic-bezier(.4,0,.2,1);--ease-bounce:cubic-bezier(.34,1.56,.64,1);
}
*{margin:0;padding:0;box-sizing:border-box}
*::selection{background:rgba(79,107,255,.2);color:var(--primary)}
html{scroll-behavior:smooth}
html,body{width:100%;min-height:100%;background:#fbfcff;font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
button{font-family:inherit;border:none;background:none;cursor:pointer}

/* 背景层 */
.bg-layer{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;}
.bg-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(79,107,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(79,107,255,.05) 1px,transparent 1px);background-size:60px 60px;mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 30%,transparent 80%);-webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 30%,transparent 80%);}
.bg-blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5;mix-blend-mode:multiply;animation:blobMove 20s ease-in-out infinite;}
.bg-blob.b1{width:480px;height:480px;background:radial-gradient(circle,rgba(122,77,255,.45),transparent 70%);top:-100px;right:-60px;}
.bg-blob.b2{width:440px;height:440px;background:radial-gradient(circle,rgba(79,107,255,.4),transparent 70%);top:30%;left:-140px;animation-delay:-7s;}
.bg-blob.b3{width:380px;height:380px;background:radial-gradient(circle,rgba(6,182,212,.28),transparent 70%);bottom:10%;right:5%;animation-delay:-13s;}
@keyframes blobMove{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(30px,-40px) scale(1.08)}66%{transform:translate(-25px,30px) scale(.94)}}

.page{width:100%;min-height:100vh;position:relative;z-index:2;}
.page-inner{width:100%;max-width:1386px;margin:0 auto;position:relative;}
.container{width:min(var(--container-w),calc(100% - 48px));margin:0 auto;position:relative;z-index:2;}

/* Header */
.header-wrap{width:100%;background:rgba(255,255,255,.72);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);box-shadow:var(--shadow-header);border-bottom:1px solid rgba(255,255,255,.6);position:sticky;top:0;z-index:100;transition:all .3s var(--ease);}
.header-wrap.scrolled{background:rgba(255,255,255,.92);box-shadow:0 8px 30px rgba(31,51,120,.08);}
.header{min-height:80px;display:flex;align-items:center;justify-content:space-between;gap:20px;}
.brand{display:flex;align-items:center;flex:0 0 auto;transition:transform .3s var(--ease-bounce);}
.brand:hover{transform:scale(1.04)}
.brand img{width:153px;height:auto;object-fit:contain}
.mobile-menu-toggle{display:none;width:40px;height:40px;border:1px solid #e7ecf9;background:rgba(255,255,255,.96);border-radius:10px;align-items:center;justify-content:center;flex-direction:column;gap:4px;cursor:pointer;}
.mobile-menu-toggle span{display:block;width:16px;height:2px;border-radius:2px;background:#4a5672;transition:.3s var(--ease);}
.mobile-menu-toggle.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.mobile-menu-toggle.active span:nth-child(2){opacity:0}
.mobile-menu-toggle.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav{flex:1;display:flex;justify-content:center;align-items:center;gap:36px;flex-wrap:wrap;}
.nav a{position:relative;font-size:16px;font-weight:500;color:#2a3145;white-space:nowrap;transition:color .25s var(--ease);padding:10px 0;}
.nav a:hover,.nav a.active{color:var(--primary);font-weight:600}
.nav a::after{content:"";position:absolute;left:50%;transform:translateX(-50%) scaleX(0);bottom:-4px;width:24px;height:3px;border-radius:999px;background:linear-gradient(90deg,var(--primary),var(--primary-2));transition:transform .35s var(--ease-bounce);}
.nav a:hover::after,.nav a.active::after{transform:translateX(-50%) scaleX(1)}
.header-actions{display:flex;align-items:center;gap:14px;flex:0 0 auto;}
.btn{height:42px;border-radius:10px;border:1px solid #e7ecf9;background:rgba(255,255,255,.98);color:#20263b;font-size:15px;padding:0 22px;cursor:pointer;transition:all .3s var(--ease);white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(79,107,255,.16);border-color:var(--primary);color:var(--primary);}
.btn-register{border:none;color:#fff;background:linear-gradient(120deg,var(--primary) 0%,var(--primary-2) 50%,var(--primary) 100%);background-size:200% 100%;box-shadow:0 12px 22px rgba(103,98,255,.25);animation:gradShift 4s linear infinite;}
@keyframes gradShift{0%{background-position:0% 50%}100%{background-position:200% 50%}}
.btn-register:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(103,98,255,.4);color:#fff;}

/* FAQ Hero */
.faq-hero{padding:60px 0 30px;text-align:center;position:relative;}
.faq-hero .breadcrumb{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:20px;flex-wrap:wrap;justify-content:center;}
.faq-hero .breadcrumb a{color:var(--text-3);transition:color .3s var(--ease);}
.faq-hero .breadcrumb a:hover{color:var(--primary);}
.faq-hero .breadcrumb svg{width:12px;height:12px;}
.faq-hero h1{font-size:48px;line-height:1.2;font-weight:800;color:#0a1230;margin-bottom:18px;letter-spacing:.2px;}
.faq-hero h1 .gradient{background:linear-gradient(90deg,#357dff 0%,#6e4dff 40%,#06b6d4 80%,#357dff 100%);background-size:200% auto;-webkit-background-clip:text;background-clip:text;color:transparent;animation:gradFlow 5s linear infinite;}
@keyframes gradFlow{0%{background-position:0% center}100%{background-position:200% center}}
.faq-hero .subtitle{font-size:17px;line-height:1.7;color:var(--text-2);max-width:680px;margin:0 auto 36px;}

/* 搜索框 */
.faq-search{max-width:640px;margin:0 auto;position:relative;}
.faq-search input{width:100%;height:56px;padding:0 56px 0 56px;border:2px solid rgba(79,107,255,.15);background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-radius:14px;font-size:16px;color:var(--text);outline:none;box-shadow:0 10px 30px rgba(99,118,255,.08);transition:all .3s var(--ease);font-family:inherit;}
.faq-search input:focus{border-color:var(--primary);box-shadow:0 14px 36px rgba(79,107,255,.18);}
.faq-search input::placeholder{color:var(--text-3);}
.faq-search .search-icon{position:absolute;left:20px;top:50%;transform:translateY(-50%);color:var(--text-3);pointer-events:none;}
.faq-search .clear-btn{position:absolute;right:12px;top:50%;transform:translateY(-50%);width:32px;height:32px;border-radius:8px;background:rgba(79,107,255,.08);color:var(--primary);display:none;align-items:center;justify-content:center;cursor:pointer;transition:background .3s var(--ease);}
.faq-search .clear-btn:hover{background:rgba(79,107,255,.16);}
.faq-search.has-value .clear-btn{display:flex;}

/* 分类卡片（首页用） */
.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:50px;}
.category-card{background:var(--card-bg);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.8);border-radius:var(--radius-xl);box-shadow:var(--shadow-card);padding:32px 26px;display:flex;flex-direction:column;gap:14px;transition:transform .4s var(--ease),box-shadow .4s var(--ease);position:relative;overflow:hidden;cursor:pointer;}
.category-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-hover);}
.category-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;}
.category-card.c1::before{background:linear-gradient(90deg,#4f6bff,#7a4dff);}
.category-card.c2::before{background:linear-gradient(90deg,#06b6d4,#3b82f6);}
.category-card.c3::before{background:linear-gradient(90deg,#7a4dff,#ef4444);}
.category-card.c4::before{background:linear-gradient(90deg,#f59e0b,#ef4444);}
.category-card .cat-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;color:#fff;transition:transform .4s var(--ease-bounce);}
.category-card.c1 .cat-icon{background:linear-gradient(135deg,#4f6bff,#7a4dff);box-shadow:0 8px 20px rgba(79,107,255,.3);}
.category-card.c2 .cat-icon{background:linear-gradient(135deg,#06b6d4,#3b82f6);box-shadow:0 8px 20px rgba(6,182,212,.3);}
.category-card.c3 .cat-icon{background:linear-gradient(135deg,#7a4dff,#ef4444);box-shadow:0 8px 20px rgba(122,77,255,.3);}
.category-card.c4 .cat-icon{background:linear-gradient(135deg,#f59e0b,#ef4444);box-shadow:0 8px 20px rgba(245,158,11,.3);}
.category-card:hover .cat-icon{transform:scale(1.08) rotate(-6deg);}
.category-card .cat-icon svg{width:30px;height:30px;}
.category-card h3{font-size:18px;font-weight:700;color:#0a1230;}
.category-card p{font-size:14px;line-height:1.7;color:var(--text-2);flex:1;}
.category-card .cat-meta{display:flex;align-items:center;justify-content:space-between;padding-top:14px;border-top:1px solid var(--line);}
.category-card .count{font-size:13px;color:var(--text-3);}
.category-card .count strong{color:var(--primary);font-weight:700;font-size:15px;}
.category-card .arrow{color:var(--primary);transition:transform .3s var(--ease);}
.category-card:hover .arrow{transform:translateX(6px);}

/* 分类页布局：左侧锚点 + 右侧问答 */
.faq-layout{display:grid;grid-template-columns:240px 1fr;gap:36px;margin-top:30px;align-items:start;}
.faq-sidebar{position:sticky;top:100px;background:var(--card-bg);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.8);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);padding:22px 18px;}
.faq-sidebar h4{font-size:13px;font-weight:700;color:var(--text-3);text-transform:uppercase;letter-spacing:1px;margin-bottom:14px;padding-left:10px;}
.faq-sidebar ul{list-style:none;display:flex;flex-direction:column;gap:2px;}
.faq-sidebar a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;font-size:14px;color:var(--text-2);transition:all .25s var(--ease);}
.faq-sidebar a:hover{background:var(--primary-soft);color:var(--primary);}
.faq-sidebar a.active{background:linear-gradient(120deg,var(--primary),var(--primary-2));color:#fff;font-weight:600;box-shadow:0 6px 14px rgba(79,107,255,.25);}
.faq-sidebar a .num{font-size:11px;opacity:.7;margin-left:auto;}

/* 问答主区 */
.faq-main{min-width:0;}
.faq-section{margin-bottom:36px;scroll-margin-top:100px;}
.faq-section-title{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:800;color:#0a1230;margin-bottom:18px;}
.faq-section-title .badge{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:24px;padding:0 8px;border-radius:6px;background:linear-gradient(120deg,var(--primary),var(--primary-2));color:#fff;font-size:12px;font-weight:700;}

/* 问答项（折叠） */
.qa-list{display:flex;flex-direction:column;gap:10px;}
.qa-item{background:var(--card-bg);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.8);border-radius:14px;box-shadow:var(--shadow-soft);overflow:hidden;transition:all .3s var(--ease);scroll-margin-top:100px;}
.qa-item:hover{box-shadow:var(--shadow-card);border-color:rgba(79,107,255,.2);}
.qa-item.open{border-color:rgba(79,107,255,.3);box-shadow:0 12px 30px rgba(79,107,255,.12);}
.qa-question{width:100%;padding:18px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px;text-align:left;cursor:pointer;background:transparent;}
.qa-question .q-text{font-size:16px;font-weight:600;color:#0a1230;line-height:1.6;flex:1;display:flex;align-items:center;gap:10px;}
.qa-question .q-num{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:24px;padding:0 7px;border-radius:6px;background:var(--primary-soft);color:var(--primary);font-size:12px;font-weight:700;flex:0 0 auto;}
.qa-question .q-toggle{width:28px;height:28px;border-radius:8px;background:var(--primary-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;flex:0 0 auto;transition:all .3s var(--ease-bounce);}
.qa-item.open .q-toggle{background:linear-gradient(120deg,var(--primary),var(--primary-2));color:#fff;transform:rotate(180deg);}
.qa-answer{max-height:0;overflow:hidden;transition:max-height .4s var(--ease);}
.qa-item.open .qa-answer{max-height:1200px;}
.qa-answer-inner{padding:0 22px 22px 22px;font-size:15px;line-height:1.85;color:var(--text-2);border-top:1px dashed var(--line);padding-top:18px;margin-top:2px;}
.qa-answer-inner p{margin-bottom:10px;}
.qa-answer-inner p:last-child{margin-bottom:0;}
.qa-answer-inner ol,.qa-answer-inner ul{margin:8px 0 12px 22px;}
.qa-answer-inner li{margin-bottom:6px;}
.qa-answer-inner a{color:var(--primary);font-weight:600;border-bottom:1px dashed rgba(79,107,255,.4);transition:all .25s var(--ease);}
.qa-answer-inner a:hover{border-bottom-color:var(--primary);}
.qa-answer-inner code{background:rgba(79,107,255,.08);color:var(--primary);padding:2px 8px;border-radius:5px;font-size:13px;font-family:Consolas,Monaco,monospace;}
.qa-answer-inner .tip{margin-top:12px;padding:12px 16px;background:linear-gradient(120deg,rgba(79,107,255,.06),rgba(122,77,255,.04));border-left:3px solid var(--primary);border-radius:0 8px 8px 0;font-size:14px;color:var(--text-2);}
.qa-answer-inner .tip strong{color:var(--primary);}

/* 没有匹配结果 */
.no-result{text-align:center;padding:60px 20px;color:var(--text-3);display:none;}
.no-result.show{display:block;}
.no-result svg{width:48px;height:48px;color:var(--text-3);margin-bottom:14px;opacity:.5;}
.no-result h4{font-size:18px;color:var(--text-2);margin-bottom:6px;}
.no-result p{font-size:14px;}

/* 联系我们 CTA */
.faq-cta{margin-top:60px;padding:40px 32px;background:linear-gradient(135deg,rgba(79,107,255,.08),rgba(122,77,255,.06),rgba(6,182,212,.04));border:1px solid rgba(79,107,255,.15);border-radius:var(--radius-xl);text-align:center;backdrop-filter:blur(10px);}
.faq-cta h3{font-size:22px;font-weight:800;color:#0a1230;margin-bottom:10px;}
.faq-cta p{font-size:14px;color:var(--text-2);margin-bottom:22px;}
.faq-cta-actions{display:inline-flex;gap:14px;flex-wrap:wrap;justify-content:center;}
.faq-cta-btn{height:46px;padding:0 26px;border-radius:11px;font-size:15px;font-weight:600;display:inline-flex;align-items:center;gap:8px;transition:all .3s var(--ease);}
.faq-cta-btn.primary{color:#fff;background:linear-gradient(120deg,var(--primary),var(--primary-2));box-shadow:0 10px 24px rgba(79,107,255,.3);}
.faq-cta-btn.primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(79,107,255,.42);}
.faq-cta-btn.secondary{background:#fff;color:var(--text);border:1px solid var(--line);}
.faq-cta-btn.secondary:hover{transform:translateY(-2px);border-color:var(--primary);color:var(--primary);}

/* 相关分类（分类页底部） */
.related-cats{margin-top:50px;}
.related-cats-title{font-size:16px;font-weight:700;color:#0a1230;margin-bottom:16px;}
.related-cats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}
.related-cat{padding:18px 20px;background:var(--card-bg);backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;gap:12px;transition:all .3s var(--ease);}
.related-cat:hover{transform:translateY(-3px);border-color:var(--primary);box-shadow:var(--shadow-soft);}
.related-cat .ric{width:36px;height:36px;border-radius:9px;background:var(--primary-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;flex:0 0 auto;}
.related-cat .rt{flex:1;min-width:0;}
.related-cat strong{display:block;font-size:14px;color:#0a1230;font-weight:700;margin-bottom:2px;}
.related-cat span{font-size:12px;color:var(--text-3);}

/* Footer */
.site-footer{width:100%;padding:40px 0 32px;text-align:center;border-top:1px solid var(--line);margin-top:60px;}
.site-footer-inner{display:inline-flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;font-size:13px;color:#98a2bb;}
.site-footer .divider{color:#c7cfdf}

/* fade in */
.fade-in{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease);}
.fade-in.visible{opacity:1;transform:translateY(0);}

/* Responsive */
@media (max-width:1100px){
  .faq-layout{grid-template-columns:1fr;}
  .faq-sidebar{position:static;display:flex;flex-direction:column;}
  .faq-sidebar ul{flex-direction:row;flex-wrap:wrap;gap:8px;}
  .faq-sidebar li{flex:1;min-width:140px;}
  .category-grid{grid-template-columns:repeat(2,1fr);}
  .related-cats-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:992px){
  .faq-hero h1{font-size:36px;}
  .faq-hero .subtitle{font-size:15px;}
}
@media (max-width:640px){
  .container{width:calc(100% - 24px);}
  .mobile-menu-toggle{display:flex !important;}
  .nav{position:fixed;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 0;box-shadow:0 10px 25px rgba(0,0,0,.08);display:none !important;gap:0;}
  .nav.show{display:flex !important;}
  .nav a{width:100%;text-align:center;padding:14px 0;font-size:15px;}
  .nav a::after{display:none;}
  .header{min-height:64px;gap:8px;}
  .header-actions .btn{height:36px;font-size:13px;padding:0 14px;}
  .brand img{width:120px;}
  .faq-hero{padding:36px 0 16px;}
  .faq-hero h1{font-size:28px;}
  .faq-search input{height:50px;font-size:15px;}
  .category-grid{grid-template-columns:1fr;}
  .qa-question{padding:16px 18px;}
  .qa-question .q-text{font-size:15px;}
  .qa-answer-inner{padding:0 18px 18px 18px;font-size:14px;}
  .related-cats-grid{grid-template-columns:1fr;}
  .faq-cta{padding:32px 22px;}
  .faq-cta h3{font-size:18px;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important;}
}