:root{--ink:#172b3f;--muted:#627181;--blue:#0b5cab;--blue-soft:#eef5fb;--bg:#f7f9fb;--line:#e1e7ed;--white:#fff;--shell:min(1040px,calc(100% - 40px));--radius:12px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}.shell{width:var(--shell);margin-inline:auto}.narrow{max-width:760px}.narrow-wide{max-width:860px}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;z-index:100;background:#fff;padding:8px 12px;border:1px solid var(--line)}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.header-inner{height:76px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:12px;min-width:0}.brand-mark{width:54px;height:54px;display:grid;place-items:center;overflow:hidden;flex:0 0 auto}.brand-mark img{width:54px;height:54px;object-fit:contain;display:block;transform:none}.brand-copy{min-width:0}.brand-copy strong{display:block;font-size:16px;line-height:1.15;letter-spacing:.005em;white-space:nowrap}.brand-copy small{display:block;font-size:11px;line-height:1.2;color:var(--blue);font-weight:800;letter-spacing:.045em;margin-top:5px;white-space:nowrap}.main-nav{margin-left:auto;display:flex;align-items:center;gap:4px}.main-nav a{padding:8px 10px;font-size:12px;font-weight:700;color:#4d5f70;border-radius:7px}.main-nav a:hover,.main-nav a.active{color:var(--blue);background:var(--blue-soft)}.menu-button{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 10px;color:var(--ink);font-weight:700}
.home-hero{padding:68px 0 46px}.hero-narrow{max-width:780px}.kicker{margin:0 0 10px;color:var(--blue);font-size:11px;font-weight:800;letter-spacing:.1em}.home-hero h1,.page-head h1{margin:0;line-height:1.22;letter-spacing:-.035em}.home-hero h1{font-size:clamp(42px,6vw,66px)}.lead{max-width:700px;margin:22px 0 0;color:var(--muted);font-size:17px}.hero-actions{display:flex;align-items:center;gap:20px;margin-top:30px}.button{display:inline-flex;justify-content:center;align-items:center;min-height:44px;padding:0 18px;border:1px solid transparent;border-radius:9px;font-size:13px;font-weight:800}.button.primary{background:var(--blue);color:#fff}.button.primary:hover{background:#084b8d}.button.secondary{background:#fff;border-color:#cfd9e2;color:var(--ink)}.button.is-disabled{cursor:default;color:#7b8996;background:#f1f4f6;border-color:#d9e0e6}.text-link{color:var(--blue);font-size:13px;font-weight:750}.text-link span{margin-left:4px}.platform-info{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg)}.info-row{display:flex;justify-content:space-between;align-items:center;gap:26px;padding:20px 0}.info-row h2{font-size:16px;margin:0 0 4px}.info-row p{font-size:13px;color:var(--muted);margin:0}.section{padding:52px 0}.section.soft{background:var(--bg)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:18px}.section-head.compact{margin-bottom:14px}.section-head h2{font-size:28px;line-height:1.35;margin:0;letter-spacing:-.02em}.section-head>p{max-width:500px;margin:0;color:var(--muted);font-size:13px}
.purpose-list{border-top:1px solid var(--line)}.purpose-list>a{display:grid;grid-template-columns:44px 1fr 24px;gap:14px;align-items:center;padding:16px 4px;border-bottom:1px solid var(--line)}.purpose-list>a:hover{background:linear-gradient(90deg,transparent,var(--blue-soft),transparent)}.purpose-list>a>span{font-size:11px;color:#91a0ae;font-weight:800}.purpose-list strong,.purpose-list small{display:block}.purpose-list strong{font-size:16px}.purpose-list small{font-size:12px;color:var(--muted);margin-top:3px}.purpose-list b{color:var(--blue);font-size:17px;font-weight:500}
.main-contents{padding:0 0 48px}.main-contents-head{margin-bottom:18px}.main-card-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.main-card{position:relative;min-height:154px;padding:14px 15px 14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--white);display:flex;flex-direction:column;align-items:flex-start;transition:border-color .16s ease,background-color .16s ease,transform .16s ease}.main-card:hover{border-color:#a9bfd3;background:var(--blue-soft);transform:translateY(-2px)}.main-card-icon{width:64px;height:52px;border-radius:12px;display:grid;place-items:center;background:rgba(255,255,255,.78);margin-bottom:8px;flex:0 0 auto;overflow:hidden;padding:6px}.main-card-icon img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}.main-card-icon--app img{width:46px;height:46px}.main-card-icon--column img{width:42px;height:42px}.main-card-icon--youtube img{width:54px;height:36px}.main-card-icon--audio img{width:56px;height:40px}.main-card-icon--study img{width:56px;height:40px}.main-card-action{font-size:11px;font-weight:800;color:var(--blue);letter-spacing:.04em}.main-card strong{display:block;margin-top:7px;font-size:17px;line-height:1.3;letter-spacing:-.01em}.main-card small{display:block;margin-top:4px;color:var(--muted);font-size:11px;line-height:1.45;max-width:15em}.main-card b{position:absolute;right:14px;bottom:12px;color:var(--blue);font-size:17px;font-weight:500}.main-card:nth-child(1){background:#eef5ff;border-color:#cfe0f5}.main-card:nth-child(1) .main-card-icon{background:rgba(255,255,255,.78)}.main-card:nth-child(2){background:#f5f7fb;border-color:#dce3ee}.main-card:nth-child(2) .main-card-icon{background:rgba(255,255,255,.82)}.main-card:nth-child(3){background:#fff1f1;border-color:#f1d2d4}.main-card:nth-child(3) .main-card-icon{background:rgba(255,255,255,.82)}.main-card:nth-child(4){background:#eefaf6;border-color:#cfe9df}.main-card:nth-child(4) .main-card-icon{background:rgba(255,255,255,.76)}.main-card:nth-child(5){background:#fff7eb;border-color:#eeddbd}.main-card:nth-child(5) .main-card-icon{background:rgba(255,255,255,.76)}.main-card:hover{filter:saturate(1.02)}
.two-column{display:grid;grid-template-columns:1fr 1fr;gap:54px}.content-list{border-top:1px solid var(--line)}.content-row{display:grid;grid-template-columns:72px 1fr 20px;gap:12px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}.media-label{font-size:10px;font-weight:800;text-align:center;padding:4px 6px;border-radius:5px;background:#eaf4ef;color:#287851}.media-label.youtube{background:#fff0f0;color:#b62d35}.content-row strong,.content-row small{display:block}.content-row strong{font-size:13px;line-height:1.55}.content-row small{font-size:10px;color:var(--muted);margin-top:3px}.content-row b{color:#8d9aa7;font-weight:500}.content-row:hover strong{color:var(--blue)}
.service-list{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}.service-list>a{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:23px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.service-list strong,.service-list small{display:block}.service-list strong{font-size:15px}.service-list small{font-size:11px;color:var(--muted);margin-top:4px}.service-list b{color:var(--blue);font-weight:500}.service-list>a:hover{background:var(--bg)}
.page-head{padding:58px 0 42px;border-bottom:1px solid var(--line);background:var(--bg)}.breadcrumbs{font-size:11px;color:var(--muted);margin:0 0 18px}.breadcrumbs a{color:var(--blue)}.page-head h1{font-size:clamp(34px,5vw,50px)}.page-head>div>p:last-child{max-width:720px;color:var(--muted);font-size:15px;margin:14px 0 0}.filters{display:grid;grid-template-columns:1.25fr 1fr .8fr;gap:14px;padding-bottom:20px;border-bottom:1px solid var(--line)}.filters label span{display:block;font-size:10px;font-weight:800;color:#536473;margin-bottom:6px}.filters select,.filters input{width:100%;height:42px;border:1px solid #cfd8e1;border-radius:8px;background:#fff;padding:0 11px;color:var(--ink)}.filters .search{grid-column:1/-1}.results-head{display:flex;justify-content:space-between;align-items:center;padding:22px 0 8px}.results-head strong{font-size:13px}.results-head button{border:0;background:none;color:var(--blue);font-size:12px}.results-list{border-top:1px solid var(--line)}.result-row{display:grid;grid-template-columns:80px 1fr auto;gap:16px;align-items:center;padding:18px 0;border-bottom:1px solid var(--line)}.result-row h2{font-size:15px;line-height:1.55;margin:0}.result-row p{font-size:11px;color:var(--muted);margin:5px 0 0}.result-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:7px}.result-meta span{font-size:9px;color:#667788}.result-row>a{color:var(--blue);font-size:12px;font-weight:750}.empty{padding:36px 0;color:var(--muted);text-align:center}
.service-index{border-top:1px solid var(--line)}.service-index>a{display:grid;grid-template-columns:58px minmax(0,1fr) auto;justify-content:stretch;align-items:center;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}.service-logo{width:52px;height:52px;border-radius:11px;display:grid;place-items:center;background:var(--bg);overflow:hidden;padding:6px}.service-logo img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}.service-logo--app img{width:42px;height:42px}.service-logo--audio img,.service-logo--study img{width:44px;height:34px}.service-logo--x{background:#111827}.service-logo--x img{width:24px;height:24px}.service-logo--youtube img{width:42px;height:28px}.service-index h2{font-size:21px;margin:0 0 5px}.service-index p{font-size:13px;color:var(--muted);margin:0}.service-index span:last-child{color:var(--blue);font-size:12px;font-weight:750;white-space:nowrap}.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:60px;align-items:start}.prose{max-width:760px}.prose h2{font-size:23px;margin:36px 0 10px;letter-spacing:-.01em}.prose h2:first-child{margin-top:0}.prose p,.prose li{color:#455a6d}.prose ul{padding-left:1.2em}.action-panel{position:sticky;top:92px;display:grid;gap:10px;padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg)}.simple-steps{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}.simple-steps li{display:grid;grid-template-columns:38px 1fr;gap:18px;padding:26px 0;border-bottom:1px solid var(--line)}.simple-steps li>span{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--blue);color:#fff;font-size:12px;font-weight:800}.simple-steps h2{font-size:20px;margin:0 0 6px}.simple-steps p{margin:0 0 8px;color:var(--muted);font-size:13px}.simple-steps a{color:var(--blue);font-size:12px;font-weight:750}
.site-footer{margin-top:28px;border-top:1px solid var(--line);padding:24px 0}.footer-inner{display:grid;grid-template-columns:1fr auto auto;gap:30px;align-items:center}.footer-inner strong{font-size:14px}.footer-inner p,.footer-inner small{font-size:10px;color:var(--muted);margin:2px 0 0}.footer-inner nav{display:flex;gap:18px}.footer-inner nav a{font-size:11px;color:#506170}
@media(max-width:780px){.main-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.menu-button{display:block}.main-nav{display:none;position:absolute;top:76px;left:0;right:0;padding:12px 20px 16px;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch}.main-nav.open{display:flex}.main-nav a{padding:11px}.home-hero{padding:54px 0 40px}.info-row,.section-head{align-items:flex-start;display:block}.info-row .text-link,.section-head .text-link{display:inline-block;margin-top:12px}.two-column{grid-template-columns:1fr;gap:46px}.filters{grid-template-columns:1fr 1fr}.filters .search{grid-column:1/-1}.detail-layout{grid-template-columns:1fr}.action-panel{position:static}.footer-inner{grid-template-columns:1fr}.footer-inner nav{flex-wrap:wrap}}
@media(max-width:520px){.main-card-grid{grid-template-columns:1fr}.main-card{min-height:142px}.main-contents{padding-bottom:52px}:root{--shell:min(100% - 28px,1040px)}.brand-copy strong{font-size:13px}.brand-copy small{display:block;font-size:8.5px;margin-top:3px;letter-spacing:.025em}.home-hero h1{font-size:42px}.lead{font-size:15px}.hero-actions{align-items:flex-start;flex-direction:column;gap:14px}.section{padding:52px 0}.section-head h2{font-size:24px}.purpose-list>a{grid-template-columns:34px 1fr 18px;padding:18px 0}.purpose-list small{font-size:11px}.service-list{grid-template-columns:1fr}.filters{grid-template-columns:1fr}.filters .search{grid-column:auto}.result-row{grid-template-columns:66px 1fr}.result-row>a{grid-column:2}.footer-inner nav{gap:12px 16px}}

@media(max-width:520px){.service-index>a{grid-template-columns:48px minmax(0,1fr);gap:13px}.service-logo{width:44px;height:44px;padding:5px}.service-index>a>span:last-child{grid-column:2;margin-top:3px}.brand-mark{width:42px;height:42px}.brand-mark img{width:42px;height:42px}.main-card-icon{width:58px;height:48px;padding:5px}}

@media(max-width:900px) and (min-width:781px){
  .brand-copy strong{font-size:14px}
  .brand-copy small{font-size:9px}
  .main-nav a{padding:8px 7px;font-size:11px}
}
@media(max-width:520px){
  .header-inner{height:68px;gap:10px}
  .main-nav{top:68px}
  .brand{gap:8px}
}

.page-identity{
  display:flex;
  align-items:center;
  gap:18px;
  margin:0;
}
.page-identity h1{min-width:0}
.page-identity-logo{
  width:74px;
  height:66px;
  flex:0 0 auto;
  display:grid;
  place-items:center;
  overflow:hidden;
  border-radius:14px;
  background:#fff;
  border:1px solid var(--line);
  padding:7px;
}
.page-identity-logo img{
  display:block;
  width:auto;
  height:auto;
  max-width:100%;
  max-height:100%;
  object-fit:contain;
}
.page-identity-logo--app img{width:56px;height:56px}
.page-identity-logo--audio img{width:66px;height:48px}
.page-identity-logo--study img{width:66px;height:48px}
.page-identity-logo--column img{width:54px;height:54px}
.page-identity-logo--youtube img{width:64px;height:44px}
.page-identity-logo--x{background:#111827;border-color:#111827}
.page-identity-logo--x img{width:34px;height:34px}
.page-identity-logo--contents:not(.page-identity-logo--column):not(.page-identity-logo--youtube) img{
  width:58px;
  height:58px;
}
@media(max-width:520px){
  .page-identity{gap:12px}
  .page-identity-logo{
    width:58px;
    height:54px;
    border-radius:11px;
    padding:6px;
  }
  .page-identity-logo--app img{width:45px;height:45px}
  .page-identity-logo--audio img,
  .page-identity-logo--study img{width:52px;height:38px}
  .page-identity-logo--column img{width:43px;height:43px}
  .page-identity-logo--youtube img{width:50px;height:34px}
  .page-identity-logo--x img{width:27px;height:27px}
  .page-identity-logo--contents:not(.page-identity-logo--column):not(.page-identity-logo--youtube) img{
    width:46px;
    height:46px;
  }
}


/* v18: contextual links and study-plan calculator */
.context-links{display:grid;gap:22px;margin:0 0 28px;padding:0 0 28px;border-bottom:1px solid var(--line)}
.context-links[hidden]{display:none}
.context-group{display:grid;gap:12px}
.context-group-head{display:flex;align-items:baseline;gap:12px}
.context-group-head>span{font-size:10px;font-weight:800;color:var(--blue);letter-spacing:.08em;white-space:nowrap}
.context-group-head h2{font-size:18px;line-height:1.4;margin:0}
.context-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.context-card-grid--single{grid-template-columns:minmax(0,1fr)}
.context-card{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:13px;align-items:center;padding:15px 16px;border:1px solid var(--line);border-radius:10px;background:#fff;transition:border-color .16s ease,background-color .16s ease,transform .16s ease}
.context-card:hover{border-color:#a9bfd3;background:var(--blue-soft);transform:translateY(-1px)}
.context-card--tool{background:#f1f7fd;border-color:#cfe0f1}
.context-card-type{align-self:start;margin-top:1px;padding:3px 7px;border-radius:5px;background:#fff0f0;color:#b62d35;font-size:9px;font-weight:800;white-space:nowrap}
.context-card--tool .context-card-type{background:#e8f2fb;color:var(--blue)}
.context-card strong,.context-card small{display:block}
.context-card strong{font-size:14px;line-height:1.45}
.context-card small{margin-top:4px;color:var(--muted);font-size:10px;line-height:1.55}
.context-card b{color:var(--blue);font-size:16px;font-weight:500}

.plan-tool{padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg)}
.plan-back-link{display:inline-block;margin:0 0 15px;color:var(--blue);font-size:12px;font-weight:750}
.plan-choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.plan-choice-card{position:relative;display:flex;min-height:410px;flex-direction:column;padding:30px;border:1px solid #cfddea;border-radius:var(--radius);background:#f5f9fd}
.plan-choice-card--hours{background:#eef6fc;border-color:#bfd5e8}
.plan-choice-number{position:absolute;top:24px;right:26px;color:#a8bfd2;font-size:28px;font-weight:800;line-height:1}
.plan-choice-card h2{margin:0;font-size:26px;line-height:1.4;letter-spacing:-.02em}
.plan-choice-card>p:not(.kicker){margin:15px 0 0;color:var(--muted);font-size:13px}
.plan-choice-points{display:grid;gap:6px;margin:20px 0 24px;padding:0;list-style:none}
.plan-choice-points li{position:relative;padding-left:20px;color:#455a6d;font-size:12px}
.plan-choice-points li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:800}
.plan-choice-card .button{width:100%;margin-top:auto}
.plan-choice-note{margin:18px 0 0;padding:15px 17px;border-left:3px solid var(--blue);background:var(--bg);color:var(--muted);font-size:12px}
.plan-choice-note strong{color:var(--blue)}
.plan-method{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-bottom:20px}
.plan-method--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.plan-method span{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:9px;background:#fff;color:var(--muted);font-size:11px}
.plan-method strong{color:var(--blue);font-size:19px;line-height:1}
.plan-form{display:grid;grid-template-columns:1fr 1fr auto;gap:14px;align-items:end}
.plan-form label>span{display:block;margin-bottom:6px;color:#536473;font-size:10px;font-weight:800}
.plan-form input{width:100%;height:44px;padding:0 11px;border:1px solid #cfd8e1;border-radius:8px;background:#fff;color:var(--ink)}
.plan-form label small{display:block;margin-top:5px;color:var(--muted);font-size:9px}
.plan-form .button{height:44px;border:0}
.plan-error{margin:16px 0 0;padding:11px 13px;border:1px solid #efc7c9;border-radius:8px;background:#fff4f4;color:#9e2630;font-size:12px}
.plan-result{scroll-margin-top:100px;margin-top:34px}
.plan-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:18px}
.plan-summary--four{grid-template-columns:repeat(4,minmax(0,1fr))}
.plan-summary>div{padding:15px;border:1px solid var(--line);border-radius:10px;background:#fff}
.plan-summary span,.plan-summary strong{display:block}
.plan-summary span{color:var(--muted);font-size:10px}
.plan-summary strong{margin-top:4px;color:var(--blue);font-size:22px;line-height:1.2}
.plan-summary--dates strong{font-size:17px;line-height:1.35}
.plan-warning{margin:0 0 18px;padding:13px 15px;border:1px solid #ecd9a6;border-radius:9px;background:#fff9e8;color:#765a14;font-size:12px}
.plan-timeline{border-top:1px solid var(--line)}
.plan-phase{position:relative;display:grid;grid-template-columns:52px 1fr;gap:18px;padding:22px 4px;border-bottom:1px solid var(--line)}
.plan-phase-number{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:var(--blue);color:#fff;font-size:10px;font-weight:800}
.plan-phase p{margin:0;color:var(--blue);font-size:10px;font-weight:800;letter-spacing:.05em}
.plan-phase h2{margin:3px 0 8px;font-size:18px;line-height:1.4}
.plan-phase strong,.plan-phase small{display:block}
.plan-phase strong{font-size:13px}
.plan-phase small{margin-top:3px;color:var(--muted);font-size:10px}
.plan-phase--two .plan-phase-number{background:#397bb4}
.plan-phase--three .plan-phase-number{background:#6a96bc}
.plan-phase--adjust .plan-phase-number{background:#52677a}
.plan-note{margin:14px 0 0;color:var(--muted);font-size:11px}
.plan-related{display:flex;justify-content:space-between;align-items:center;gap:28px;margin-top:42px;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.plan-related h2{margin:0;font-size:22px}
.plan-related p:not(.kicker){margin:7px 0 0;color:var(--muted);font-size:12px}
.mobile-only{display:none}

@media(max-width:780px){
  .context-card-grid{grid-template-columns:1fr}
  .plan-choice-grid{grid-template-columns:1fr}
  .plan-choice-card{min-height:0}
  .plan-method--three{grid-template-columns:1fr 1fr}
  .plan-form{grid-template-columns:1fr 1fr}
  .plan-summary--four{grid-template-columns:1fr 1fr}
  .plan-form .button{grid-column:1/-1}
  .plan-related{align-items:flex-start;flex-direction:column}
}
@media(max-width:520px){
  .context-group-head{display:block}
  .context-group-head h2{margin-top:3px}
  .context-card{grid-template-columns:1fr auto;gap:9px 12px}
  .context-card-type{grid-column:1/-1;justify-self:start}
  .plan-tool{padding:17px}
  .plan-choice-card{padding:24px 20px}
  .plan-choice-card h2{font-size:22px}
  .plan-choice-number{top:21px;right:20px;font-size:24px}
  .plan-method,.plan-method--three,.plan-form,.plan-summary,.plan-summary--four{grid-template-columns:1fr}
  .plan-form .button{grid-column:auto}
  .plan-phase{grid-template-columns:42px 1fr;gap:11px;padding:20px 0}
  .plan-phase-number{width:34px;height:34px}
  .plan-phase h2{font-size:16px}
  .plan-phase strong{font-size:11px}
  .mobile-only{display:block}
}

/* v21: 学習コラム + YouTube portal search */
.result-kind{display:grid;gap:7px;justify-items:stretch}
.result-type-icon{height:42px;display:grid;place-items:center;overflow:hidden;border-radius:8px;background:var(--bg);padding:4px}
.result-type-icon img{display:block;max-width:100%;max-height:100%;object-fit:contain}
.result-eyecatch{display:block;width:100%;height:48px;object-fit:cover;border-radius:8px;background:var(--bg)}
.media-label.column{background:var(--blue-soft);color:var(--blue)}
@media(max-width:520px){.result-type-icon{height:36px}.result-eyecatch{height:40px}}

/* v19: learning articles */
.home-articles{padding:36px 0;border-top:1px solid var(--line);background:#fff}
.home-articles .section-head{margin-bottom:12px}
.home-articles .section-head h2{font-size:21px}
.home-article-list{border-top:1px solid var(--line)}
.home-article-list>a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:center;padding:16px 2px;border-bottom:1px solid var(--line)}
.home-article-list strong,.home-article-list small{display:block}
.home-article-list strong{font-size:15px;line-height:1.55}
.home-article-list small{margin-top:3px;color:var(--muted);font-size:11px}
.home-article-list b{color:var(--blue);font-size:17px;font-weight:500}
.home-article-list>a:hover strong{color:var(--blue)}
.article-list{border-top:1px solid var(--line)}
.article-card{padding:28px 0;border-bottom:1px solid var(--line)}
.article-card-date{margin:0 0 6px;color:var(--muted);font-size:10px}
.article-card h2{margin:0;font-size:22px;line-height:1.5;letter-spacing:-.015em}
.article-card h2 a:hover{color:var(--blue)}
.article-card>p:not(.article-card-date){margin:8px 0 13px;color:var(--muted);font-size:13px}
.article-shell{max-width:760px}
.article-hero{padding:54px 0 42px;border-bottom:1px solid var(--line);background:var(--bg)}
.article-hero .breadcrumbs{line-height:1.6}
.article-hero h1{margin:0;font-size:clamp(32px,5vw,47px);line-height:1.35;letter-spacing:-.03em}
.article-description{margin:17px 0 0;color:var(--muted);font-size:14px}
.article-dates{display:flex;gap:18px;margin:15px 0 0;color:#788692;font-size:10px}
.article-body{padding:44px 0 12px;font-size:16px}
.article-body section{margin-top:54px}
.article-body h2,.article-video h2,.article-related h2{margin:0 0 18px;font-size:25px;line-height:1.45;letter-spacing:-.02em}
.article-body p{margin:0 0 1.35em;color:#364e62}
.article-body strong{color:var(--ink)}
.article-body ul,.article-body ol{margin:1.2em 0 1.5em;padding:17px 20px 17px 42px;border-radius:10px;background:var(--bg);color:#364e62}
.article-body li+li{margin-top:6px}
.article-video,.article-related{margin-top:52px;padding-top:34px;border-top:1px solid var(--line)}
.video-frame{position:relative;overflow:hidden;width:100%;aspect-ratio:16/9;border-radius:10px;background:#0b1722}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.article-link-list{border-top:1px solid var(--line)}
.article-link-list>a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:center;padding:18px 2px;border-bottom:1px solid var(--line)}
.article-link-list strong,.article-link-list small{display:block}
.article-link-list strong{font-size:15px;line-height:1.5}
.article-link-list small{margin-top:4px;color:var(--muted);font-size:11px}
.article-link-list b{color:var(--blue);font-size:17px;font-weight:500}
.article-link-list>a:hover strong{color:var(--blue)}
.article-reference{margin:34px 0 0;color:#7b8894;font-size:10px}
.article-back{margin-top:34px;padding:25px 0;border-top:1px solid var(--line)}

@media(max-width:520px){
  .home-articles{padding:30px 0}
  .home-articles .section-head h2{font-size:19px}
  .article-card{padding:24px 0}
  .article-card h2{font-size:19px}
  .article-hero{padding:42px 0 34px}
  .article-hero h1{font-size:30px}
  .article-description{font-size:13px}
  .article-body{padding-top:34px;font-size:15px}
  .article-body section{margin-top:44px}
  .article-body h2,.article-video h2,.article-related h2{font-size:21px}
  .article-body ul,.article-body ol{padding:15px 14px 15px 34px}
  .article-video,.article-related{margin-top:44px;padding-top:28px}
}

/* v20: Excel + Markdown learning columns */
.article-category{display:inline-flex;align-items:center;margin:0 0 14px;padding:5px 9px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-size:10px;font-weight:800}
.article-card{display:block}
.article-card--with-image{display:grid;grid-template-columns:180px minmax(0,1fr);gap:24px;align-items:start}
.article-card-image{display:block;overflow:hidden;border-radius:10px;background:var(--bg);aspect-ratio:16/9}
.article-card-image img{display:block;width:100%;height:100%;object-fit:cover}
.article-card-content{min-width:0}
.article-card-meta{display:flex;gap:10px;align-items:center;margin:0 0 7px!important;color:var(--muted)!important;font-size:10px!important}
.article-card-meta span{display:inline-flex;padding:3px 7px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-weight:800}
.article-list--recommended{margin:0 0 44px}
.article-list--recommended .article-card{padding:22px 0}
.column-recommended{margin:0 0 46px;padding:24px 26px 1px;border:1px solid #cfe0f1;border-radius:var(--radius);background:#f5f9fd}
.column-recommended>h2{margin:3px 0 14px;font-size:23px}
.article-eyecatch{overflow:hidden;margin:34px 0 0;border-radius:12px;background:var(--bg);aspect-ratio:16/9}
.article-eyecatch img{display:block;width:100%;height:100%;object-fit:cover}
.article-body h2{margin:52px 0 17px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.article-body h2:first-child{margin-top:0}
.article-body h3{margin:34px 0 12px;font-size:20px;line-height:1.5}
.article-body a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.article-body blockquote{margin:25px 0;padding:18px 20px;border-left:4px solid var(--blue);background:var(--blue-soft);color:#364e62}
.article-body blockquote p{margin:0}
.article-figure{margin:32px 0}
.article-figure img{display:block;max-width:100%;height:auto;margin:0 auto;border-radius:10px}
.article-figure figcaption{margin-top:9px;color:var(--muted);font-size:10px;text-align:center}
.article-table-scroll{overflow-x:auto;margin:28px 0;border:1px solid var(--line);border-radius:10px;background:#fff;-webkit-overflow-scrolling:touch}
.article-table-scroll:focus{outline:2px solid var(--blue);outline-offset:2px}
.article-table-scroll table{width:100%;min-width:520px;border-collapse:collapse;font-size:13px}
.article-table-scroll th,.article-table-scroll td{padding:12px 14px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);text-align:left;vertical-align:top}
.article-table-scroll th:last-child,.article-table-scroll td:last-child{border-right:0}
.article-table-scroll tr:last-child td{border-bottom:0}
.article-table-scroll th{background:var(--bg);color:var(--ink);font-weight:800}
.article-cta{display:flex;justify-content:space-between;align-items:center;gap:28px;margin-top:52px;padding:28px;border:1px solid #bfd5e8;border-radius:var(--radius);background:#eef6fc}
.article-cta h2{margin:3px 0 8px;font-size:22px}
.article-cta p:not(.kicker){max-width:550px;margin:0;color:var(--muted);font-size:12px}
.article-cta .button{flex:0 0 auto}

@media(max-width:780px){
  .article-card--with-image{grid-template-columns:150px minmax(0,1fr);gap:18px}
  .article-cta{align-items:flex-start;flex-direction:column}
}
@media(max-width:520px){
  .article-card--with-image{display:block}
  .article-card-image{margin-bottom:16px}
  .article-card-meta{align-items:flex-start;flex-direction:column;gap:6px}
  .column-recommended{margin-bottom:36px;padding:20px 18px 1px}
  .column-recommended>h2{font-size:20px}
  .article-eyecatch{margin-top:24px}
  .article-body h2{margin-top:43px}
  .article-body h3{font-size:18px}
  .article-table-scroll{margin-right:-14px;margin-left:-14px;border-right:0;border-left:0;border-radius:0}
  .article-cta{margin-top:44px;padding:22px 20px}
  .article-cta h2{font-size:20px}
  .article-cta .button{width:100%}
}