/* Installation Rules Study Mate: shared styles for blog posts and landing pages */
:root{
  --paper:#F5F7FA;--surface:#FFFFFF;--ink:#10203A;--muted:#4A5A73;--line:#D5DCE6;
  --volt:#FFD43B;--volt-press:#F2C200;--earth:#17794A;--band:#10203A;--band-ink:#EAF0F8;--band-muted:#A9B8CE;--focus:#1F5FD6;
  --font-display:"Bricolage Grotesque","Segoe UI",system-ui,sans-serif;
  --font-body:"IBM Plex Sans","Segoe UI",system-ui,sans-serif;
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#0B1626;--surface:#12233B;--ink:#EAF0F8;--muted:#A9B8CE;--line:#25395A;--band:#060E1A;--focus:#7DB0FF;--earth:#3FBF86}
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:1.0625rem;line-height:1.65;-webkit-font-smoothing:antialiased}
body.has-sticky{padding-bottom:84px}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.12;letter-spacing:-0.02em;margin:0;color:var(--ink)}
p{margin:0}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:4px}
.skip-link{position:absolute;left:-9999px;top:8px;background:var(--volt);color:#10203A;padding:10px 16px;border-radius:8px;z-index:60;font-weight:600}
.skip-link:focus{left:8px}
.wrap,.container{width:min(1160px,100% - 40px);margin-inline:auto}
.narrow{width:min(760px,100% - 40px);margin-inline:auto}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 24px;border-radius:8px;font:600 1rem/1 var(--font-body);text-decoration:none;border:2px solid transparent;cursor:pointer;background:var(--volt);color:#10203A;transition:background-color .15s,color .15s,border-color .15s}
.btn:hover{background:var(--volt-press)}
.btn.alt,.btn.ghost,.btn-line{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn.alt:hover,.btn.ghost:hover,.btn-line:hover{background:var(--ink);color:var(--paper)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ink:hover{background:var(--muted)}
.btn-sm{min-height:42px;padding:0 16px;font-size:.95rem}
.cta-row,.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

/* Header */
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:22px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--font-display);font-weight:800;font-size:1.2rem;letter-spacing:-0.02em;margin-right:auto}
.brand img{height:36px;width:auto}
.nav ul{display:flex;gap:24px;list-style:none;margin:0;padding:0}
.nav a{text-decoration:none;font-weight:500;color:var(--muted);padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--ink);border-bottom-color:var(--volt)}
.login{font-weight:600;text-decoration:none;padding:6px 2px}
.login:hover{text-decoration:underline;text-underline-offset:4px}
.menu-btn{display:none;min-height:42px;padding:0 14px;border:2px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font:600 .95rem var(--font-body);cursor:pointer}

/* Blog post */
.post-head{padding:clamp(36px,6vw,72px) 0 clamp(22px,3vw,34px);background:radial-gradient(900px 380px at 90% 0%,color-mix(in srgb,var(--volt) 15%,transparent),transparent 70%);border-bottom:1px solid var(--line)}
.page-header h1{font-size:clamp(2rem,4.8vw,3.15rem);font-weight:800;line-height:1.08;letter-spacing:-0.03em}
.meta{margin-top:16px;color:var(--muted);font-size:.95rem}
.series-nav .pagination{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:22px 0 0;padding:0}
.series-nav li>a,.series-nav li>span{display:inline-flex;align-items:center;min-height:40px;padding:0 16px;border:2px solid var(--line);border-radius:8px;font-weight:600;text-decoration:none;background:var(--surface)}
.series-nav li>a:hover{border-color:var(--ink)}
.series-nav li.active>span{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.prose{padding-block:clamp(28px,5vw,56px)}
.prose section+section{margin-top:44px}
.prose h2{font-size:clamp(1.55rem,3vw,2rem);font-weight:800;margin-bottom:14px}
.prose h3{font-size:1.3rem;font-weight:700;margin:26px 0 8px}
.prose p+p,.prose p+ul,.prose ul+p{margin-top:14px}
.prose a:not(.btn){font-weight:600;text-decoration:underline;text-decoration-color:var(--volt);text-decoration-thickness:3px;text-underline-offset:3px}
.prose a:not(.btn):hover{text-decoration-color:var(--ink)}
.prose img{border-radius:12px;margin:26px 0;border:1px solid var(--line)}
.prose .cta-line{margin-top:22px}
ul.checklist,.syllabus-list{list-style:none;margin:14px 0 0;padding:0}
ul.checklist li,.syllabus-list li{position:relative;padding:8px 0 8px 34px;border-bottom:1px solid var(--line)}
ul.checklist li::before{content:"";position:absolute;left:0;top:.95em;width:20px;height:20px;background:var(--earth);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat}
.syllabus-list li::before{content:"";position:absolute;left:8px;top:1.1em;width:8px;height:8px;border-radius:50%;background:var(--volt)}

.highlight-box{margin-top:40px;padding:22px 24px;border-left:6px solid var(--volt);background:var(--surface);border-radius:0 12px 12px 0}
.highlight-box h4{font-size:1.1rem;font-weight:700;margin-bottom:6px}
.highlight-box p{color:var(--muted)}

.prose a.banner{display:block;text-decoration:none}
.prose a.banner img{margin:26px 0}
.hero .grid img{max-width:420px;margin-inline:auto}

/* End-of-post call to action */
.cta-card{display:grid;grid-template-columns:200px 1fr;gap:28px;align-items:center;margin:8px 0 clamp(40px,6vw,72px);padding:clamp(22px,4vw,36px);background:var(--band);color:var(--band-ink);border-radius:14px}
.cta-card h2{color:var(--band-ink);font-size:clamp(1.4rem,2.6vw,1.8rem);font-weight:800}
.cta-card p{margin-top:10px;color:var(--band-muted)}
.cta-card .btn-line{border-color:var(--band-ink);color:var(--band-ink)}
.cta-card .btn-line:hover{background:var(--band-ink);color:#10203A}
.cta-art{background:#FDFDFE;border-radius:10px;padding:14px}
.cta-art img{height:200px;width:auto;margin-inline:auto}

/* Landing pages */
.lp .hero{padding-block:clamp(36px,7vw,84px);background:radial-gradient(900px 420px at 88% 0%,color-mix(in srgb,var(--volt) 15%,transparent),transparent 70%)}
.hero .grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,5vw,64px);align-items:center}
.kicker,.eyebrow{margin-bottom:14px;font-weight:600;color:var(--muted);font-size:.98rem}
.hero h1{font-size:clamp(2.2rem,5vw,3.7rem);font-weight:800;line-height:1.04;letter-spacing:-0.03em}
.hero .sub,.hero .lead{margin-top:20px;font-size:1.15rem;color:var(--muted);max-width:56ch}
.hero>.container>p{margin-top:20px;font-size:1.15rem;color:var(--muted);max-width:62ch}
.note{margin-top:16px;color:var(--muted);font-size:.95rem}
.trust{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:22px;color:var(--muted);font-size:.95rem}
.hero img{width:100%;height:auto;border-radius:14px;margin:0}
.lp section{padding-block:clamp(36px,6vw,72px)}
.lp main.container section{padding-block:0}
.lp section h2,.lp .container>h2{font-size:clamp(1.7rem,3.4vw,2.4rem);font-weight:800;margin-bottom:14px}
.lp h3{font-size:1.25rem;font-weight:700;margin:22px 0 8px}
.lp h4{font-size:1.05rem;font-weight:700;margin:16px 0 6px}
.lp p+p{margin-top:12px}
.muted,.section-title+.muted{color:var(--muted)}
.info,.cards,.lp .grid:not(.hero .grid){display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin-block:clamp(20px,4vw,36px)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:26px}
.card h2,.card h3{margin-top:0;font-size:1.3rem;font-weight:700}
.card ul{list-style:none;margin:12px 0 0;padding:0}
.card li{position:relative;padding:6px 0 6px 26px}
.card li::before{content:"";position:absolute;left:4px;top:.95em;width:8px;height:8px;border-radius:50%;background:var(--volt)}
.card ul ul{margin-top:4px}
.pill,.badge{display:inline-block;margin-bottom:10px;background:var(--volt);color:#10203A;border-radius:999px;padding:5px 12px;font-weight:700;font-size:.85rem}
.price{margin-top:6px;font-family:var(--font-display);font-weight:800;font-size:1.5rem;letter-spacing:-0.02em}
.divider{height:1px;background:var(--line);margin:clamp(32px,5vw,56px) 0}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,64px);align-items:start}
.lp .checklist{list-style:none}
.lp details{border-bottom:1px solid var(--line)}
.lp details>summary{list-style:none;cursor:pointer;position:relative;padding:18px 40px 18px 0;font:700 1.15rem/1.3 var(--font-display)}
.lp details>summary::-webkit-details-marker{display:none}
.lp details>summary::after{content:"+";position:absolute;right:4px;top:50%;transform:translateY(-50%);font:500 1.7rem/1 var(--font-body)}
.lp details[open]>summary::after{content:"\2212"}
.lp details>p{padding:0 40px 20px 0;color:var(--muted);max-width:62ch}
.lp details a{font-weight:600;text-decoration:underline;text-decoration-color:var(--volt);text-decoration-thickness:3px}
.cta-section{background:var(--band);color:var(--band-ink);text-align:center;padding:clamp(48px,7vw,88px) 20px}
.cta-section h2{color:var(--band-ink)}
.cta-section p{color:var(--band-muted);margin-inline:auto}
.cta-section .btn{margin-top:6px}
.sticky-cta{position:fixed;left:0;right:0;bottom:0;z-index:35;background:var(--band);color:var(--band-ink);padding:12px 0;box-shadow:0 -10px 28px rgba(0,0,0,.25)}
.sticky-cta .container{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;justify-content:space-between}

/* More post elements */
.prose figure{margin:26px 0}
.prose figure img{margin:0 auto}
.prose figcaption{margin-top:10px;text-align:center;color:var(--muted);font-size:.92rem}
.prose ul:not(.checklist){margin:14px 0 0;padding-left:1.3em}
.prose ol{margin:14px 0 0;padding-left:1.4em}
.prose li{margin:6px 0}
.prose ul.checklist li{margin:0}
hr.bottom-line{border:0;height:1px;background:var(--line);margin:36px 0 18px}
.faq-item{border-bottom:1px solid var(--line);padding:16px 0}
.faq-question{font:700 1.15rem/1.3 var(--font-display);margin:0}
.faq-answer{margin-top:8px;color:var(--muted)}
.series-pager{margin:34px 0 0}
.pager{display:flex;justify-content:space-between;gap:12px;list-style:none;margin:0;padding:0}
.pager a{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border:2px solid var(--line);border-radius:8px;font-weight:600;text-decoration:none;background:var(--surface)}
.pager a:hover{border-color:var(--ink)}
.prose .author-info h4{font-size:1.1rem;font-weight:700;margin-bottom:6px}

/* Blog index */
.index-hero{padding:clamp(40px,7vw,84px) 0 clamp(24px,4vw,40px);background:radial-gradient(900px 380px at 88% 0%,color-mix(in srgb,var(--volt) 15%,transparent),transparent 70%);border-bottom:1px solid var(--line)}
.index-hero h1{font-size:clamp(2.2rem,5vw,3.5rem);font-weight:800;letter-spacing:-0.03em;line-height:1.05}
.index-hero p{margin-top:16px;max-width:60ch;color:var(--muted);font-size:1.15rem}
.index-group{padding-top:clamp(32px,5vw,56px)}
.index-group h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:800}
.index-group>.wrap>p{margin-top:8px;color:var(--muted);max-width:60ch}
.post-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:18px;margin-top:22px}
.post-card{display:flex;flex-direction:column;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:14px;text-decoration:none;transition:border-color .15s}
.post-card:hover{border-color:var(--ink)}
.post-card h3{font-size:1.2rem;font-weight:700;line-height:1.25}
.post-card p{margin-top:8px;color:var(--muted);font-size:.98rem}
.post-card .date{margin-top:auto;padding-top:14px;font-size:.88rem;color:var(--muted)}
.post-card.feature{background:var(--band);border-color:var(--band)}
.post-card.feature h3{color:var(--band-ink);font-size:1.45rem}
.post-card.feature p,.post-card.feature .date{color:var(--band-muted)}
.index-end{padding-block:clamp(40px,6vw,72px)}
@media (min-width:900px){.post-card.feature{grid-column:span 2}}

/* Footer */
.site-footer{background:var(--band);color:var(--band-ink);padding-block:36px}
.foot{display:flex;flex-wrap:wrap;gap:12px 32px;align-items:center;justify-content:space-between}
.foot nav{display:flex;flex-wrap:wrap;gap:8px 24px}
.foot a{color:var(--band-ink);text-decoration:none;font-weight:500}
.foot a:hover{text-decoration:underline}
.foot p{color:var(--band-muted);font-size:.95rem}
.foot p a{color:var(--band-ink);text-decoration:underline}

@media (max-width:960px){
  .menu-btn{display:inline-flex;align-items:center}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--paper);border-bottom:1px solid var(--line);padding:8px 20px 20px}
  .nav.open{display:block}
  .nav ul{flex-direction:column;gap:0}
  .nav a{display:block;padding:14px 0;border-bottom:1px solid var(--line)}
  .hero .grid,.grid-2{grid-template-columns:1fr}
  .cta-card{grid-template-columns:1fr}
  .cta-art{max-width:240px}
}
@media (max-width:700px){.login{display:none}}
@media (max-width:520px){.bar>.btn{display:none}.cta-row .btn,.actions .btn{width:100%}.sticky-cta .btn{width:100%}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}