body.buy-design-page{background:linear-gradient(120deg,#f5faff,#edf6ff);color:#102b63;--ink:#102b63;--muted:#7185a6;--line:#dce8f8;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
body.buy-design-page>.topbar,body.buy-design-page>.footer{display:none}
.buy-design-page [hidden]{display:none!important}
.buy-design-page *{box-sizing:border-box}
.buy-desktop-header,.buy-desktop-footer{background:#f7fbff}
.buy-desktop-header svg,.buy-desktop-footer svg{display:block;width:100%;height:auto}
.buy-mobile-header,.buy-mobile-footer{display:none}
.buy-main{max-width:1440px;padding:24px 40px 12px;margin:0 auto}
.buy-intro{text-align:center;margin-bottom:18px}
.buy-intro .buy-eyebrow{color:#1677ff;font-size:12px;font-weight:600;letter-spacing:2px;margin:0 0 6px}
.buy-intro h1{font-size:32px;line-height:1.4;margin:0 0 4px;letter-spacing:0;color:#102b63}
.buy-intro>p:last-child{font-size:15px;color:#7185a6;margin:0;line-height:1.6}
.buy-course-tabs{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);max-width:650px;margin:0 auto;background:#eaf3ff;border:1px solid #cfe1fa;border-radius:7px;padding:0;gap:0}
.buy-course-tabs a{display:grid;place-items:center;min-width:0;white-space:nowrap;padding:9px;color:#244977;font-size:16px;font-weight:600;border-radius:8px;text-decoration:none}
.buy-course-tabs a[aria-selected="true"]{background:#1677ff;color:#fff;box-shadow:0 3px 8px #1677ff20}
.buy-filters{display:flex;justify-content:center;gap:12px;margin:8px 0 0}
.buy-filters button{font:inherit;font-size:13px;min-height:34px;padding:6px 18px;border:1px solid #d9e7fa;border-radius:22px;background:#fff;color:#244977;cursor:pointer;white-space:nowrap}
.buy-filters button[aria-pressed="true"]{color:#fff;background:#1677ff;border-color:#1677ff}
.buy-course-panel{margin-top:14px;scroll-margin-top:16px}
.buy-course-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}
.buy-course-heading h2{font-size:18px;font-weight:700;line-height:1.5;color:#102b63;margin:0}
.buy-course-heading>a{font-size:13px;color:#52759f;white-space:nowrap;text-decoration:none}
.buy-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px 18px}
.buy-card{display:flex;flex-direction:column;min-width:0;padding:18px 22px 12px;background:#fff;border:1px solid #d9e7fa;border-radius:12px;box-shadow:0 4px 16px #3466ac04;transition:border-color .15s,box-shadow .15s}
.buy-card:hover{border-color:#8cbcff;box-shadow:0 6px 20px #3466ac0c}
.buy-card-heading{display:grid;grid-template-columns:32px minmax(0,1fr) auto;column-gap:12px;row-gap:0;align-items:center}
.buy-card-icon{width:32px;height:32px;color:#1677ff}
.buy-card h3{font-size:20px;line-height:1.4;color:#102b63;margin:0;letter-spacing:0}
.buy-badge{grid-column:3;justify-self:end;font-size:12px;line-height:1.5;padding:6px 10px;background:#e8f2ff;color:#1677ff;border-radius:5px}
.buy-benefits{display:grid;gap:6px;list-style:none;padding:0;margin:16px 0 10px;font-size:14px;line-height:1.5;color:#47638a}
.buy-benefits li{display:flex;align-items:flex-start;gap:8px}
.buy-benefits li>span{flex:0 0 16px;height:16px;display:grid;place-items:center;margin-top:3px;color:#1677ff;background:#eaf4ff;border:1px solid #b8d9ff;border-radius:50%;font-size:11px;line-height:1}
.buy-benefits .buy-difference{background:#edf5ff;color:#116ce7;font-weight:600;border-radius:5px;padding:3px 5px;margin:-3px -5px}
.buy-card-bottom{margin-top:auto}
.buy-price{display:flex;align-items:baseline;gap:10px;margin:0 0 8px}
.buy-price strong{font-size:27px;font-weight:750;line-height:1.3;letter-spacing:-.5px;color:#1677ff}
.buy-price>span{font-size:11px;color:#8496af}
.buy-primary{display:flex;align-items:center;justify-content:center;gap:12px;background:#1677ff;color:#fff;text-decoration:none;border:1px solid #1677ff;border-radius:6px;padding:7px 12px;font-size:15px;line-height:1.5;font-weight:600;min-height:44px}
.buy-primary:hover{color:#fff;background:#0865e5}
.buy-payment-note{font-size:11px;line-height:1.5;text-align:center;color:#8496af;margin:8px 0 0}
.buy-channels{position:relative;font-size:12px;margin:0;color:#1677ff;text-align:center}
.buy-channels summary{cursor:pointer;list-style:none;line-height:18px}.buy-channels summary::-webkit-details-marker{display:none}
.buy-channels>div{position:absolute;right:0;top:25px;z-index:5;display:grid;min-width:135px;gap:6px;padding:8px;background:#fff;border:1px solid #d9e7fa;border-radius:8px;box-shadow:0 8px 24px #102b6320}
.buy-channels a{display:block;background:#f0f6ff;color:#1677ff;padding:8px 10px;border-radius:6px;text-decoration:none}
.buy-help{display:flex;align-items:center;gap:14px;background:#eaf4ff;border:1px solid #d3e5fc;border-radius:10px;padding:10px 20px;margin:14px 0 10px}
.buy-help>img{flex:0 0 40px}
.buy-help h2{font-size:16px;line-height:1.5;margin:0;color:#102b63}
.buy-help p{font-size:12px;line-height:1.6;color:#7185a6;margin:0}
.buy-help button{margin-left:auto;flex-shrink:0;min-height:40px;padding:8px 22px;background:#fff;color:#1677ff;border:1px solid #1677ff;border-radius:7px;font:inherit;font-size:13px;cursor:pointer}
.buy-faq{display:grid;gap:8px}
.buy-faq details{background:#fff;border:1px solid #dce8f8;border-radius:8px;padding:0 18px}
.buy-faq summary{list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:13px;line-height:1.6;font-weight:500;padding:10px 0;cursor:pointer}
.buy-faq summary::-webkit-details-marker{display:none}
.buy-faq summary::after{content:"›";font-size:18px;color:#7d95b5}
.buy-faq details[open] summary::after{content:"⌄"}
.buy-faq p{font-size:13px;color:#7185a6;line-height:1.9;margin:0;padding:0 0 16px}
.buy-faq a{color:#1677ff}
.buy-empty{padding:32px 20px;text-align:center;font-size:14px;color:#7185a6;background:#fff;border:1px solid #dce8f8;border-radius:12px}
.buy-design-page a:focus-visible,.buy-design-page button:focus-visible,.buy-design-page summary:focus-visible{outline:3px solid #86b8ff;outline-offset:3px}
body.buy-dialog-open{overflow:hidden}
.buy-assistant-dialog{inset:0;width:fit-content;max-width:calc(100vw - 32px);max-height:calc(100dvh - 32px);margin:auto;padding:0;border:0;border-radius:16px;background:#076dde;overflow:auto;box-shadow:0 24px 80px #102b6740}
.buy-assistant-dialog::backdrop{background:#10234099;backdrop-filter:blur(4px)}
.buy-assistant-dialog>img{display:block;width:auto;height:auto;max-width:min(420px,calc(100vw - 32px));max-height:calc(100dvh - 48px);object-fit:contain}
.buy-assistant-dialog>button{position:absolute;top:8px;right:8px;display:grid;place-items:center;width:36px;height:36px;min-height:0;padding:0;border:0;border-radius:50%;background:#fff;color:#123979;font-size:28px;line-height:1;cursor:pointer}
@media(min-width:769px) and (max-width:1050px){.buy-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:768px){
  .buy-desktop-header,.buy-desktop-footer{display:none}
  .buy-mobile-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px;min-height:64px;background:#fff;border-bottom:1px solid #e5eef9}
  .buy-mobile-header .site-brand-logo{width:102px;height:34px}
  .buy-mobile-login{background:#1677ff;color:#fff;padding:8px 13px;border-radius:7px;font-size:12px;font-weight:600;text-decoration:none;white-space:nowrap}
  .buy-main{padding:20px 16px}
  .buy-intro{margin-bottom:20px}
  .buy-intro .buy-eyebrow{display:none}
  .buy-intro h1{font-size:25px;margin-bottom:8px}
  .buy-intro>p:last-child{font-size:13px}
  .buy-course-tabs{max-width:none}
  .buy-course-tabs:has(>a:nth-child(4):last-child){grid-template-columns:repeat(3,minmax(0,1fr)) minmax(0,1.7fr)}
  .buy-course-tabs a{font-size:14px;padding:8px}
  .buy-filters{display:grid;grid-template-columns:.95fr .8fr .8fr 1.35fr;gap:5px;margin-top:12px}
  .buy-filters button{font-size:11px;padding:6px 3px;min-height:32px}
  .buy-course-panel{margin-top:14px}
  .buy-course-heading{gap:8px;margin-bottom:12px}
  .buy-course-heading h2{font-size:14px}
  .buy-course-heading>a{font-size:11px}
  .buy-grid{grid-template-columns:1fr;gap:14px}
  .buy-card{padding:18px 16px 14px}
  .buy-card-heading{grid-template-columns:28px minmax(0,1fr) auto;gap:8px}
  .buy-card-icon{width:28px;height:28px}
  .buy-card h3{font-size:17px}
  .buy-badge{grid-column:3;font-size:10px;padding:3px 6px}
  .buy-benefits{margin:16px 0;gap:8px;font-size:13px}
  .buy-price strong{font-size:29px}
  .buy-help{position:relative;display:grid;grid-template-columns:36px minmax(0,1fr);padding:16px 30px 16px 14px;gap:12px;margin-top:16px}
  .buy-help>img{width:34px;height:34px}
  .buy-help h2{font-size:14px}
  .buy-help p{font-size:11px}
  .buy-help button{position:absolute;inset:0;width:100%;height:100%;margin:0;padding:0;border:0;background:transparent;color:transparent;font-size:0}.buy-help button span{position:absolute;right:14px;top:50%;transform:translateY(-50%);font-size:20px;color:#52759f}
  .buy-faq details{padding:0 13px}
  .buy-faq summary{font-size:12px}
  .buy-mobile-footer{display:block;padding:0 16px 22px;text-align:center;color:#8c9eb8;font-size:11px}
}

.buy-selected-title{text-align:center;font-size:18px;line-height:1.5;color:#102b63;margin:10px 0 0;font-weight:700}
.buy-main.is-enhanced .buy-course-heading{display:none}
.buy-payment-row{display:flex;justify-content:center;align-items:center;gap:16px;min-height:28px;margin-top:5px;color:#738aac;font-size:12px}
.buy-help>div{display:flex;align-items:center;gap:14px}
@media(min-width:769px) and (max-width:1200px){.buy-card-heading{column-gap:8px}.buy-card h3{font-size:17px}.buy-badge{padding:5px 7px;font-size:10px}.buy-help>div{display:grid;gap:2px}}
@media(max-width:768px){.buy-selected-title{display:none}.buy-help>div{display:grid;gap:3px}.buy-card h3{font-size:18px}.buy-badge{padding:5px 8px}.buy-benefits{font-size:14px;gap:6px;margin:16px 0 12px}.buy-price strong{font-size:26px}.buy-price{margin-bottom:8px}.buy-payment-row{font-size:12px;gap:12px}.buy-filters{margin-top:14px}.buy-course-tabs a{padding:10px}.buy-intro h1{font-size:25px}.buy-card-icon{width:30px;height:30px}}
@media(max-width:360px){.buy-main{padding-left:12px;padding-right:12px}.buy-card{padding-left:12px;padding-right:12px}.buy-card h3{font-size:16px}.buy-badge{font-size:9px;padding:4px 5px}.buy-card-heading{gap:6px}.buy-benefits{font-size:12px}}
@media(max-width:480px){.buy-course-tabs a{padding-inline:4px;font-size:clamp(12px,3.4vw,14px)}}

/* Course identity follows the shared site convention: 高项蓝、系规青绿、中项紫。 */
.buy-main{
  --course-accent:#1675ee;
  --course-strong:#0d62d1;
  --course-soft:#e7f1ff;
  --course-surface:#f3f8ff;
  --course-border:#b9d5fa;
}
.buy-main[data-active-course="xigui"]{
  --course-accent:#168b84;
  --course-strong:#0f716b;
  --course-soft:#e3f5f2;
  --course-surface:#f1faf8;
  --course-border:#addbd6;
}
.buy-main[data-active-course="zhongxiang"]{
  --course-accent:var(--course-zhongxiang-accent);
  --course-strong:#5546b4;
  --course-soft:var(--course-zhongxiang-soft);
  --course-surface:#f6f4ff;
  --course-border:#cec7f3;
}
.buy-course-tabs a.is-gaoxiang{--tab-accent:#1675ee;--tab-soft:#e7f1ff}
.buy-course-tabs a.is-xigui{--tab-accent:#168b84;--tab-soft:#e3f5f2}
.buy-course-tabs a.is-zhongxiang{--tab-accent:var(--course-zhongxiang-accent);--tab-soft:var(--course-zhongxiang-soft)}
.buy-course-tabs a{color:var(--tab-accent,#244977)}
.buy-course-tabs a:hover{background:var(--tab-soft,#fff)}
.buy-course-tabs a[aria-selected="true"]{background:var(--tab-accent,var(--course-accent));color:#fff;box-shadow:0 3px 8px color-mix(in srgb,var(--tab-accent,var(--course-accent)) 22%,transparent)}
.buy-filters button[aria-pressed="true"]{background:var(--course-accent);border-color:var(--course-accent)}
.buy-course-panel .buy-card{border-color:color-mix(in srgb,var(--course-accent) 24%,#d9e7fa)}
.buy-course-panel .buy-card:hover{border-color:var(--course-accent);box-shadow:0 8px 22px color-mix(in srgb,var(--course-accent) 10%,transparent)}
.buy-course-panel .buy-card-icon,
.buy-course-panel .buy-price strong,
.buy-course-panel .buy-channels,
.buy-course-panel .buy-channels a,
.buy-course-panel .buy-course-heading>a{color:var(--course-accent)}
.buy-course-panel .buy-badge{background:var(--course-soft);color:var(--course-strong)}
.buy-course-panel .buy-benefits li>span{color:var(--course-accent);background:var(--course-soft);border-color:var(--course-border)}
.buy-course-panel .buy-benefits .buy-difference{background:var(--course-surface);color:var(--course-strong)}
.buy-course-panel .buy-primary{background:var(--course-accent);border-color:var(--course-accent)}
.buy-course-panel .buy-primary:hover{background:var(--course-strong);border-color:var(--course-strong)}
.buy-main .buy-help{background:var(--course-surface);border-color:var(--course-border)}
.buy-main .buy-help button{color:var(--course-accent);border-color:var(--course-accent)}
.buy-main .buy-faq a{color:var(--course-accent)}
.buy-main a:focus-visible,.buy-main button:focus-visible,.buy-main summary:focus-visible{outline-color:color-mix(in srgb,var(--course-accent) 55%,#fff)}