*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#F4F5F8;--surface:#FFFFFF;--border:#DDE2EC;--text:#1A2435;--text2:#5A6880;--text3:#66758B;
--accent:#0055AA;--accent-lt:#E6F1FB;--accent-light:#3EACF2;--brand-green:#6BA82E;--brand-green-text:#527F1F;--radius:8px}
html{font-size:15px;scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.68}
.skip-link{position:absolute;left:-9999px;top:0;z-index:200;background:var(--accent);color:#fff;font-weight:600;padding:10px 18px;border-radius:0 0 var(--radius) 0;text-decoration:none;font-size:.9rem}
.skip-link:focus{left:0}
#content:focus{outline:none}
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:relative;padding:0 20px}
.site-header::after{content:'';position:absolute;left:0;right:0;bottom:-2px;height:2px;background:linear-gradient(90deg,var(--accent-light) 0%,var(--accent) 45%,var(--brand-green) 100%)}
.header-inner{max-width:900px;margin:0 auto;display:flex;align-items:center;min-height:60px;gap:20px}
.logo{display:flex;align-items:center;text-decoration:none;flex-shrink:0}
.logo-img{height:36px;width:auto;display:block}
.header-nav{margin-left:auto;display:flex;gap:18px;flex-wrap:wrap}
.header-nav a{font-size:.85rem;font-weight:500;color:var(--text2);text-decoration:none;white-space:nowrap}
.header-nav a:hover{color:var(--accent)}
main{max-width:900px;margin:28px auto 60px;padding:0 20px}
.back{display:inline-block;margin-bottom:18px;font-size:.85rem;font-weight:600;color:var(--accent);text-decoration:none}
.back:hover{text-decoration:underline}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:34px 40px;margin-bottom:20px}
h1{font-size:1.65rem;letter-spacing:-.02em;margin-bottom:10px;line-height:1.3}
.lead{color:var(--text2);font-size:1rem;margin-bottom:6px}
.updated{color:var(--text3);font-size:.85rem;margin-bottom:20px}
h2{font-size:1.2rem;margin:24px 0 10px}
p{margin-bottom:12px;color:var(--text2)}
ul{margin:0 0 12px 22px;color:var(--text2)}
li{margin-bottom:6px}
a{color:var(--accent)}
strong{color:var(--text)}
.cta{display:inline-block;background:var(--accent);color:#fff;font-weight:600;font-size:.92rem;padding:11px 22px;border-radius:var(--radius);text-decoration:none;margin:6px 0 4px}
.cta:hover{background:#00468c}
.course-list{list-style:none;margin:14px 0 4px}
.course-list li{background:var(--bg);border:1px solid var(--border);border-left:4px solid var(--accent-light);border-radius:var(--radius);padding:12px 16px;margin-bottom:9px}
.course-list li:nth-child(even){border-left-color:var(--brand-green-text)}
.course-list a{font-weight:600;font-size:.93rem;text-decoration:none}
.course-list a:hover{text-decoration:underline}
.course-list .meta{display:block;font-size:.78rem;color:var(--text3);margin-top:3px}
.note{background:#F0F7E8;border:1px solid #CBE3B4;border-radius:var(--radius);padding:13px 16px;font-size:.88rem;color:#3F6B18;margin:18px 0}
.related{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.related a{font-size:.82rem;font-weight:500;background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:5px 13px;text-decoration:none}
.related a:hover{border-color:var(--accent-light);background:var(--accent-lt)}
.crumbs{font-size:.82rem;color:var(--text3);margin-bottom:18px}
.crumbs a{color:var(--accent);text-decoration:none;font-weight:500}
.crumbs a:hover{text-decoration:underline}
.crumbs .div{margin:0 7px;color:var(--border)}
footer{max-width:900px;margin:0 auto;padding:24px 20px;color:var(--text3);font-size:.8rem;border-top:1px solid var(--border)}
footer a{color:var(--text3);text-decoration:underline}
footer .sep{margin:0 6px}
@media(max-width:560px){.card{padding:24px 22px}}

/* ---- mobile header ---- */
.hamburger{display:none;margin-left:auto;width:38px;height:38px;flex-shrink:0;align-items:center;justify-content:center;background:var(--surface);border:1px solid var(--border);border-radius:8px;color:var(--text2);cursor:pointer}
.hamburger:hover{color:var(--accent);border-color:var(--accent-light)}
@media(max-width:860px){
  .header-inner{height:auto;min-height:60px;padding:8px 0}
  .hamburger{display:flex}
  .header-nav{display:none;position:absolute;top:calc(100% + 2px);right:12px;z-index:150;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 24px rgba(0,0,0,.14);flex-direction:column;gap:0;padding:6px;min-width:200px;margin-left:0}
  .header-nav.open{display:flex}
  .header-nav a{font-size:.9rem;padding:11px 14px;border-radius:6px}
  .header-nav a:hover{background:var(--accent-lt)}
}

/* ---- explore band ---- */
.explore-band{background:var(--surface);border-top:1px solid var(--border);margin-top:44px;padding:34px 20px 30px;position:relative}
.explore-band::before{content:'';position:absolute;top:-2px;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--accent-light) 0%,var(--accent) 45%,var(--brand-green,#6BA82E) 100%)}
.explore-inner{max-width:1100px;margin:0 auto}
.explore-cta{font-size:1.05rem;font-weight:600;color:var(--text);max-width:760px;line-height:1.5;margin:0 0 22px}
.explore-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.explore-col h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text3);margin:0 0 10px;font-weight:600}
.explore-col p{font-size:.85rem;color:var(--text2);margin:0 0 8px;line-height:1.5}
.explore-col a{display:block;font-size:.86rem;color:var(--accent);text-decoration:none;margin-bottom:6px;font-weight:500}
.explore-col a:hover{text-decoration:underline}
.explore-col a.explore-link{font-weight:700}
.ad-incontent,.ad-prefooter{margin:26px auto;text-align:center;max-width:900px}
.ad-prefooter{margin:40px auto -6px;padding:0 20px}
@media(max-width:760px){.explore-cols{grid-template-columns:1fr 1fr}}
@media(max-width:460px){.explore-cols{grid-template-columns:1fr}}

/* ---- inline subscribe (P4) ---- */
.mini-sub{background:var(--accent-lt);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;margin:26px 0 6px}
.mini-sub h3{font-size:1rem;margin:0 0 3px;color:var(--text)}
.mini-sub .ms-sub{font-size:.82rem;color:var(--text2);margin:0 0 11px}
.mini-sub-form{display:flex;gap:8px;flex-wrap:wrap}
.mini-sub-form input[type=email]{flex:1;min-width:190px;font-family:inherit;font-size:.9rem;padding:9px 12px;border:1px solid var(--border);border-radius:6px;color:var(--text);background:var(--surface)}
.mini-sub-form input[type=email]:focus{outline:2px solid var(--accent-light);border-color:var(--accent)}
.mini-sub-form button{font-family:inherit;font-size:.85rem;font-weight:600;padding:9px 16px;border:none;border-radius:6px;background:var(--accent);color:#fff;cursor:pointer}
.mini-sub-form button:hover{background:#00468c}
.mini-sub-msg{font-size:.8rem;margin:7px 0 0}
.mini-sub-msg.ok{color:#3F6B18}.mini-sub-msg.err{color:#B23B3B}

/* ---- author byline (P3) ---- */
.byline{display:block;line-height:1.5;border-left:3px solid var(--accent);background:var(--bg);border-radius:0 6px 6px 0;padding:9px 13px;margin:4px 0 18px;font-size:.83rem;color:var(--text2)}
.byline strong{color:var(--text);font-weight:600}
.byline a{color:var(--accent);text-decoration:none;font-weight:500;white-space:nowrap}
.byline a:hover{text-decoration:underline}

/* comparison page additions */
.compare-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin:18px 0 24px}
.compare-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow-sm)}
.compare-card h3{margin-top:0;margin-bottom:7px;font-size:1.02rem}.compare-card p{font-size:.92rem;margin:0;color:var(--text2)}
.comparison-table{width:100%;border-collapse:collapse;margin:18px 0 24px;font-size:.93rem}.comparison-table th,.comparison-table td{border:1px solid var(--border);padding:10px 12px;text-align:left;vertical-align:top}.comparison-table th{background:var(--bg);font-weight:700}.comparison-table td:first-child{font-weight:600}
.dynamic-note{font-size:.85rem;color:var(--text3);margin-top:-4px}.course-actions{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0 18px}.course-actions a,.course-actions button{border:1px solid var(--border);background:var(--card);border-radius:999px;padding:8px 13px;text-decoration:none;font-weight:600;font-size:.88rem;color:var(--accent);cursor:pointer}.course-actions button:hover,.course-actions a:hover{background:var(--bg)}
.course-list.loading li{color:var(--text3)}


/* ---- mobile ergonomics (2026-07): prevent iOS input auto-zoom, enlarge tap targets ---- */
@media (max-width:768px){
  input, select, textarea{font-size:16px !important}
  .filter-clear{padding:9px 12px !important}
  .drawer-close{padding:8px 12px !important}
  .crumbs a{display:inline-block;padding:6px 2px}
}
.ad-label{display:block;margin:0 0 7px;font-size:.65rem;line-height:1;text-transform:uppercase;letter-spacing:.08em;color:var(--text3)}