:root{color-scheme:light;--ink:#091333;--muted:#586782;--blue:#345fff;--orange:#e85825;--green:#079775}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--ink);background:#f5faff;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible{outline:3px solid #102cb5;outline-offset:6px}img{max-width:100%;display:block}.wrap{width:calc(100% - 72px);max-width:1370px;margin-inline:auto}.skip{position:absolute;top:-80px;left:24px;padding:12px 20px;background:white;z-index:5}.skip:focus{top:10px}.header{height:66px;background:rgba(255,255,255,.94)}.header-inner{max-width:1280px;height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}.identity{display:flex;align-items:center;gap:24px}.wordmark{font-family:Arial,sans-serif;font-weight:900;font-size:36px;letter-spacing:-1.8px;color:#123ab3}.identity span{font-size:21px;font-weight:700;border-left:1px solid #98a6c1;padding-left:23px;white-space:nowrap}.nav{display:flex;align-items:center;gap:48px;height:100%;font-size:18px;font-weight:700}.nav a{display:flex;align-items:center;height:100%;position:relative}.nav a:hover{color:#1c4cff}.nav .active{color:#1c4cff}.nav .active:after{content:"";position:absolute;bottom:8px;left:0;right:0;height:2px;background:#1c4cff}.hero{min-height:198px;padding:34px 20px 28px;text-align:center;background:#eff6ff url('assets/hero-office.png') center 56% / cover no-repeat}.hero h1{font-size:clamp(40px,4.6vw,66px);letter-spacing:-2px;line-height:1.25;margin:0 0 16px;font-weight:900}.hero h1 em{font-style:normal;color:#4165ff}.hero p{font-size:clamp(18px,2vw,27px);line-height:1.6;margin:0;color:#303e61}.sites{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;align-items:stretch;padding-top:0}.site-card{--accent:var(--blue);display:flex;flex-direction:column;min-width:0;padding:23px 23px 22px;background:#fff;border:1px solid #e1eaff;border-radius:18px;box-shadow:0 12px 35px rgba(50,81,140,.045);transition:transform .2s,box-shadow .2s,border-color .2s}.site-card:hover{transform:translateY(-5px);box-shadow:0 16px 36px rgba(35,71,126,.11);border-color:var(--accent)}.site-card:focus-within{border-color:var(--accent)}.site-card.python{--accent:var(--orange);border-color:#f2eae5}.site-card.jsa{--accent:var(--green);border-color:#def1ed}.brand{display:flex;align-items:center;gap:17px;margin:0 0 13px}.brand img{width:72px;height:72px;object-fit:cover;border-radius:18px}.brand h2{font-family:Arial,sans-serif;font-size:clamp(27px,3.05vw,44px);font-weight:800;letter-spacing:-1.5px;margin:0;line-height:1.1}.site-card h3{color:var(--accent);font-size:clamp(24px,2.6vw,37px);font-weight:800;letter-spacing:-.8px;line-height:1.35;margin:0 0 10px;white-space:nowrap}.pitch{font-size:clamp(15px,1.4vw,20px);line-height:1.6;margin:0 0 5px;letter-spacing:-.3px;white-space:nowrap}.tags{color:var(--muted);font-size:clamp(14px,1.35vw,19px);line-height:1.6;margin:0 0 17px}.preview{display:block;overflow:hidden;border:1px solid #edf0f6;border-radius:13px;margin-top:auto;aspect-ratio:2/1;background:#f5f7fa}.preview img{width:100%;height:100%;object-fit:cover;object-position:top;transition:transform .35s}.site-card:hover .preview img{transform:scale(1.025)}.domain{display:flex;align-items:center;gap:12px;font-family:Arial,sans-serif;font-size:21px;font-weight:700;color:var(--accent);margin:16px 12px 13px}.domain img{width:25px;height:25px}.vba .domain img{filter:invert(36%) sepia(84%) saturate(3477%) hue-rotate(224deg) brightness(99%) contrast(103%)}.python .domain img{filter:invert(44%) sepia(82%) saturate(2169%) hue-rotate(347deg) brightness(96%) contrast(88%)}.jsa .domain img{filter:invert(43%) sepia(66%) saturate(785%) hue-rotate(116deg) brightness(93%) contrast(98%)}.cta{display:flex;align-items:center;justify-content:center;gap:12px;min-height:50px;border-radius:12px;background:var(--accent);color:white;font-size:20px;font-weight:700;transition:filter .2s}.cta:hover{filter:brightness(.91)}.cta img{width:22px;height:22px;filter:invert(1)}.course{margin-top:24px;display:flex;align-items:center;gap:24px;background:#20375c;color:white;border-radius:14px;overflow:hidden;min-height:128px;padding:0 48px 0 0}.course-art{width:28%;max-width:360px;align-self:stretch;object-fit:cover;object-position:center}.course-copy{flex:1;min-width:0;padding-block:18px}.course-eyebrow{color:#d1def3;font-size:17px;margin:0 0 8px}.course h2{font-size:clamp(19px,2vw,28px);line-height:1.4;margin:0 0 5px;letter-spacing:-.5px}.course-desc{font-size:16px;line-height:1.7;color:#c0d3ed;margin:0}.course-cta{display:flex;align-items:center;justify-content:center;gap:9px;flex-shrink:0;background:#f2f7ff;color:#10234b;min-height:52px;padding:12px 27px;border-radius:12px;font-size:18px;font-weight:700;transition:background .2s}.course-cta:hover{background:#dfeaff}.course-cta img{width:20px;height:20px}.footer{text-align:center;color:#5b759d;font-size:14px;line-height:1.7;padding:16px 20px 20px}.footer p{margin:0}
@media(min-width:1600px){.hero{padding-block:40px;min-height:210px}.site-card{padding:25px}.tags{margin-bottom:20px}}
@media(max-width:1100px){.wrap{width:calc(100% - 40px)}.header-inner{gap:16px}.identity{gap:16px}.identity span{font-size:17px;padding-left:16px}.wordmark{font-size:31px}.nav{gap:28px;font-size:16px}.hero{min-height:180px}.sites{gap:14px}.site-card{padding:19px 16px}.brand{gap:12px}.brand img{width:56px;height:56px;border-radius:14px}.brand h2{font-size:30px}.site-card h3{font-size:26px}.pitch{font-size:15px;white-space:normal;min-height:48px}.tags{font-size:14px}.domain{font-size:19px;margin-left:2px}.course{gap:20px;padding-right:24px}.course-art{width:24%}.course h2{font-size:21px}.course-desc{font-size:14px}.course-cta{font-size:16px;padding-inline:20px}}
@media(max-width:840px){.header{height:72px}.identity{align-items:flex-start;gap:3px;flex-direction:column}.identity span{border:0;padding:0;font-size:12px;letter-spacing:1px}.wordmark{font-size:27px}.nav{font-size:14px;gap:20px}.nav .active:after{bottom:13px}.hero{padding:30px 22px 27px;min-height:180px}.hero h1{font-size:40px;letter-spacing:-1.5px}.hero p{font-size:17px;max-width:500px;margin:auto}.sites{grid-template-columns:1fr;gap:18px;max-width:600px;padding-top:0}.site-card{padding:22px}.brand img{width:58px;height:58px}.brand h2{font-size:34px}.site-card h3{font-size:29px;white-space:normal}.pitch{font-size:17px;min-height:0}.tags{font-size:15px;margin-bottom:18px}.preview{aspect-ratio:2/1}.domain{font-size:20px;margin-top:15px}.cta{font-size:18px}.course{max-width:600px;flex-wrap:wrap;gap:0;padding:0 22px 24px;margin-top:20px}.course-art{width:40%;max-width:180px;height:100px;margin:0 10px 0 -22px;object-fit:cover}.course-copy{flex:1;padding:20px 0}.course-eyebrow{font-size:14px}.course h2{font-size:18px}.course-desc{display:none}.course-cta{width:100%;min-height:48px}.footer{font-size:12px;padding-block:18px}}
@media(max-width:380px){.wrap{width:calc(100% - 28px)}.identity span{font-size:11px}.nav{gap:14px;font-size:13px}.hero h1{font-size:33px}.hero p{font-size:15px}.site-card{padding:19px}.site-card h3{font-size:26px}.pitch{font-size:15px}.brand h2{font-size:30px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}

/* Keep the hero headline together in meaningful phrases on small screens. */
.hero h1 span{display:inline-block;white-space:nowrap}.course-art{height:128px}@media(max-width:840px){.course-art{height:100px}.hero h1{font-size:36px;line-height:1.3}.hero{padding-top:25px;padding-bottom:25px}}

@media(min-width:1101px){.course{gap:20px;padding-right:36px}.course-art{width:26%}.course h2{font-size:25px;white-space:nowrap}.course-desc{font-size:15px}.footer{padding-block:13px}.preview{aspect-ratio:2.08/1}.brand img{width:68px;height:68px}}

.preview img{transform:scale(1.18);transform-origin:top left}.site-card:hover .preview img{transform:scale(1.205)}

/* Compact phone navigation: keep all three destinations in the first viewport. */
@media(max-width:600px){
  .wrap{width:calc(100% - 28px)}
  .header{height:58px}
  .wordmark{font-size:24px;letter-spacing:-1.3px}
  .identity span{font-size:10px;letter-spacing:.5px}
  .nav{gap:16px;font-size:12px}
  .nav .active:after{bottom:10px}
  .hero{min-height:0;padding:19px 14px 20px;background-position:center 53%}
  .hero h1{font-size:28px;letter-spacing:-1.1px;line-height:1.25;margin-bottom:8px}
  .hero p{font-size:12px;line-height:1.6;max-width:330px}
  .sites{gap:10px;padding-top:0}
  .site-card{display:grid;grid-template-columns:minmax(0,1fr) 108px;grid-template-rows:30px 26px 38px;gap:7px 12px;padding:13px 14px;border-radius:15px;box-shadow:0 5px 18px rgba(50,81,140,.04)}
  .site-card:hover{transform:none}
  .brand{grid-column:1;grid-row:1;gap:8px;margin:0;align-self:center}
  .brand img{width:30px;height:30px;border-radius:8px}
  .brand h2{font-size:24px;letter-spacing:-.7px}
  .site-card h3{grid-column:1;grid-row:2;align-self:center;font-size:18px;line-height:1.35;letter-spacing:-.6px;white-space:nowrap;margin:0}
  .pitch,.tags{display:none}
  .preview{grid-column:2;grid-row:1 / 3;align-self:stretch;margin:0;width:108px;height:63px;aspect-ratio:auto;border-radius:8px}
  .preview img{object-fit:cover;transform:scale(1.08)}
  .site-card:hover .preview img{transform:scale(1.08)}
  .domain{grid-column:1;grid-row:3;gap:6px;margin:0;font-size:14px;align-self:center;min-height:38px}
  .domain img{width:17px;height:17px}
  .cta{grid-column:2;grid-row:3;gap:4px;min-height:38px;font-size:12px;border-radius:8px;white-space:nowrap}
  .cta img{width:14px;height:14px}
  .course{margin-top:12px;min-height:0;padding:13px 14px;display:grid;grid-template-columns:minmax(0,1fr) 108px;column-gap:12px;row-gap:5px;border-radius:13px}
  .course-art{display:none}
  .course-copy{padding:0}
  .course-eyebrow{font-size:12px;margin-bottom:4px}
  .course h2{font-size:13px;line-height:1.6;letter-spacing:0}
  .course-cta{width:108px;font-size:12px;gap:4px;min-height:38px;padding:8px;align-self:center;border-radius:8px}
  .course-cta img{width:14px;height:14px}
  .footer{font-size:10px;padding:12px 14px}
}
@media(max-width:360px){
  .site-card{grid-template-columns:minmax(0,1fr) 96px;column-gap:9px;padding-inline:12px}
  .site-card h3{font-size:16px}
  .brand h2{font-size:22px}
  .preview{width:96px}
  .cta{font-size:11px}
  .hero h1{font-size:25px}
  .course{grid-template-columns:minmax(0,1fr) 96px;column-gap:9px}
  .course-cta{width:96px;font-size:11px}
}

@media(max-width:600px) and (min-height:701px){
  .site-card{grid-template-rows:30px 26px 44px}
  .cta,.domain{min-height:44px}
  .course-cta{min-height:44px}
}
@media(max-width:600px) and (max-height:700px){
  .header{height:52px}
  .hero{padding:13px 14px 14px}
  .hero h1{font-size:24px;margin-bottom:5px}
  .hero p{font-size:11px}
  .sites{gap:8px}
  .site-card{grid-template-rows:28px 24px 38px;row-gap:5px;padding-block:10px}
  .brand img{width:28px;height:28px}
  .brand h2{font-size:22px}
  .preview{height:57px}
}

/* Product names supplied by the owner; retain readable compact phone cards. */
.brand h2{font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;font-size:clamp(22px,2.1vw,30px);letter-spacing:-1px;line-height:1.25}
@media(min-width:841px) and (max-width:1100px){.brand{gap:9px}.brand img{width:44px;height:44px}.brand h2{font-size:21px;letter-spacing:-.8px}.site-card h3{font-size:23px}}
@media(min-width:601px) and (max-width:840px){.brand h2{font-size:28px}}
@media(max-width:600px){.brand{gap:6px}.brand img{width:26px;height:26px;flex-shrink:0}.brand h2{font-size:18px;letter-spacing:-.8px;white-space:nowrap}.site-card h3{font-size:18px;letter-spacing:-.5px}}
@media(max-width:360px){.brand{gap:4px}.brand img{width:23px;height:23px}.brand h2{font-size:15px;letter-spacing:-.65px}.site-card h3{font-size:16px}}

/* Desktop: reserve room for the complete course entry in the first screen. */
@media(min-width:841px){
  .header{height:56px}
  .hero{min-height:0;padding:16px 20px}
  .hero h1{font-size:clamp(36px,5.2vh,52px);line-height:1.15;margin-bottom:8px}
  .hero p{font-size:clamp(16px,2.1vh,21px);line-height:1.4}
  .site-card{padding:14px 20px}
  .brand{gap:12px;margin-bottom:6px}
  .brand img{width:44px;height:44px;border-radius:12px;flex-shrink:0}
  .brand h2{font-size:clamp(20px,1.85vw,28px);letter-spacing:-.8px}
  .site-card h3{font-size:clamp(23px,2.1vw,30px);line-height:1.2;margin-bottom:6px}
  .pitch{font-size:16px;line-height:1.4;min-height:0;margin-bottom:3px}
  .tags{font-size:14px;line-height:1.4;margin-bottom:8px}
  .preview{height:clamp(140px,calc(100vh - 600px),240px);aspect-ratio:auto;flex:none;margin-top:0}
  .domain{font-size:18px;line-height:1.2;margin:8px 6px}
  .domain img{width:21px;height:21px}
  .cta{min-height:42px;font-size:17px;border-radius:9px}
  .cta img{width:19px;height:19px}
  .course{margin-top:14px;min-height:88px;gap:18px;padding-right:28px}
  .course-art{height:88px;width:23%;max-width:290px}
  .course-copy{padding-block:10px}
  .course-eyebrow{font-size:14px;margin-bottom:4px}
  .course h2{font-size:clamp(17px,1.55vw,23px);line-height:1.3;margin-bottom:3px}
  .course-desc{font-size:13px;line-height:1.5}
  .course-cta{font-size:16px;min-height:44px;padding:10px 20px;border-radius:9px}
  .footer{font-size:12px;line-height:1.5;padding:7px 20px}
}
@media(min-width:841px) and (max-height:740px){
  .header{height:50px}
  .wordmark{font-size:30px}
  .identity span{font-size:18px}
  .hero{padding:10px 20px}
  .hero h1{font-size:36px;margin-bottom:5px}
  .hero p{font-size:16px;line-height:1.3}
  .site-card{padding:12px 18px}
  .brand{margin-bottom:5px}
  .brand img{width:36px;height:36px;border-radius:10px}
  .brand h2{font-size:clamp(19px,1.7vw,25px)}
  .site-card h3{font-size:24px;line-height:1.2;margin-bottom:5px}
  .pitch{font-size:14px;line-height:1.4;margin-bottom:2px}
  .tags{font-size:13px;line-height:1.35;margin-bottom:6px}
  .preview{height:clamp(90px,calc(100vh - 500px),180px)}
  .domain{font-size:16px;margin-block:6px}
  .domain img{width:18px;height:18px}
  .cta{min-height:38px;font-size:16px}
  .course{margin-top:12px;min-height:78px}
  .course-art{height:78px}
  .course-copy{padding-block:8px}
  .course h2{font-size:clamp(17px,1.45vw,21px)}
  .course-eyebrow{font-size:13px;margin-bottom:3px}
  .course-desc{font-size:12px}
  .course-cta{min-height:40px;font-size:15px}
  .footer{padding-block:5px}
}

/* Owner's original WeChat QR: keep scan detail and open the full image on click. */
.hero-inner{display:grid;grid-template-columns:minmax(0,1fr) 112px;align-items:center;gap:20px}
.hero-copy{min-width:0}
.hero-contact{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:4px;color:#146b4e;font-size:14px;font-weight:700;line-height:1.3}
.hero-contact img{width:92px;height:92px;object-fit:contain;background:#fff;padding:5px;border-radius:5px}
.hero-contact:hover span{text-decoration:underline}
@media(min-width:841px) and (max-height:740px){.hero-inner{grid-template-columns:minmax(0,1fr) 86px;gap:16px}.hero-contact img{width:68px;height:68px;padding:4px}.hero-contact{font-size:12px}}
@media(min-width:601px) and (max-width:840px){.hero-inner{grid-template-columns:minmax(0,1fr) 96px;gap:16px}.hero h1{font-size:30px}.hero p{font-size:14px}.hero-contact img{width:82px;height:82px}}
@media(max-width:600px){.hero{padding:10px 14px}.hero-inner{width:100%;grid-template-columns:minmax(0,1fr) 88px;gap:10px}.hero h1{font-size:26px;line-height:1.25;margin:0}.hero p{display:none}.hero-contact{font-size:12px;gap:3px}.hero-contact img{width:74px;height:74px;padding:4px}}
@media(max-width:360px){.hero h1{font-size:24px}.hero-inner{grid-template-columns:minmax(0,1fr) 80px;gap:8px}.hero-contact img{width:70px;height:70px}.hero-contact{font-size:11px}}

.hero-contact span{background:#fff;padding:2px 6px;border-radius:4px;white-space:nowrap}