/* ---------
   Design tokens
--------- */
:root{
  --bg: #f5f8fb;
  --surface: #ffffff;
  --text: #13233a;
  --muted: #4b5b72;

  --primary: #1f5fa8;
  --accent: #e07a2f;

  --border: rgba(19, 35, 58, 0.10);
  --shadow: 0 10px 24px rgba(19, 35, 58, 0.10);

  --radius: 16px;

  --container: 1160px;
}

/* ---------
   Base
--------- */
* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

a{
  color: var(--primary);
  text-decoration: none;
}
a:hover{ text-decoration: underline; }

.container{
  width: min(var(--container), calc(100% - 2rem));
  margin: 0 auto;
}

.site-main{
  padding: 2rem 0 3rem;
}

/* ---------
   Header / nav
--------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 248, 251, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand{
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  text-decoration: none;
}
.brand:hover{ text-decoration: none; }

.brand-mark{
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--surface);
  box-shadow: 0 6px 16px rgba(19,35,58,0.08);
  border: 1px solid var(--border);
  font-size: 20px;
  overflow: hidden;
}
.brand-mark img{
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.brand-text{ display: grid; }
.brand-name{ font-weight: 800; letter-spacing: 0.2px; }
.brand-tagline{ font-size: 0.9rem; color: var(--muted); margin-top: 1px; }

.site-nav{
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.site-nav a{
  padding: 0.45rem 0.6rem;
  border-radius: 10px;
  color: var(--text);
}
.site-nav a:hover{
  background: rgba(31, 95, 168, 0.08);
  text-decoration: none;
}
.site-nav .nav-cta{
  background: var(--primary);
  color: white;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  box-shadow: 0 10px 20px rgba(31,95,168,0.20);
}
.site-nav .nav-cta:hover{
  background: #1a5393;
}

/* Mobile nav toggle (hamburger) */
.nav-toggle{
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  z-index: 101;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after{
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 200ms ease, opacity 200ms ease;
}

.nav-toggle-icon{
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after{
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before{ top: -7px; }
.nav-toggle-icon::after{ top: 7px; }

/* Hamburger to X animation */
.nav-toggle[aria-expanded="true"] .nav-toggle-icon{
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------
   Buttons
--------- */
.btn-row{ display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1rem; }

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.05rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover{ text-decoration: none; }

.btn-primary{
  background: var(--primary);
  color: #fff;
  box-shadow: 0 12px 22px rgba(31,95,168,0.22);
}
.btn-primary:hover{ background: #1a5393; }

.btn-secondary{
  background: rgba(31, 95, 168, 0.08);
  color: var(--primary);
  border-color: rgba(31,95,168,0.18);
}
.btn-secondary:hover{
  background: rgba(31, 95, 168, 0.12);
}

/* ---------
   Sections / cards
--------- */
.section{ margin-top: 2.2rem; }

.card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card-pad{ padding: 1.15rem; }

.card:hover{
  transform: translateY(-2px);
  transition: transform 120ms ease;
}

.card-bg{
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
}
.card-bg::before{
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.5);
  border-radius: var(--radius);
  pointer-events: none;
}
.card-bg > *{
  position: relative;
  z-index: 1;
}

.card-icon{
  display: block;
  width: 48px;
  height: 48px;
  margin: 0 auto 0.75rem;
}
.card-icon svg{
  width: 100%;
  height: 100%;
}

.grid{
  display: grid;
  gap: 1rem;
}
.grid-4{ grid-template-columns: repeat(4, 1fr); }
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-2{ grid-template-columns: repeat(2, 1fr); }

.kicker{
  display: inline-block;
  font-weight: 800;
  letter-spacing: 0.3px;
  font-size: 0.9rem;
  color: var(--primary);
}
.h1{
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  margin: 0.35rem 0 0;
}
.lede{
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0.75rem 0 0;
  max-width: 62ch;
}

.h2{
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
}

.muted{ color: var(--muted); }

/* ---------
   Hero
--------- */
.hero{
  border-radius: calc(var(--radius) + 8px);
  padding: 1.6rem 1.6rem 0;
  background:
    radial-gradient(1200px 600px at 20% 0%, rgba(224,122,47,0.18), transparent 60%),
    radial-gradient(900px 500px at 80% 20%, rgba(31,95,168,0.22), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,0.7), rgba(255,255,255,0.85));
  border: 1px solid rgba(19,35,58,0.10);
  box-shadow: 0 18px 40px rgba(19,35,58,0.12);
}

.hero-inner{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.2rem;
  align-items: stretch;
}
.hero-illus{
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: contain;
  object-position: center bottom;
}

/* ---------
   CTA band
--------- */
.cta-band{
  margin-top: 2.2rem;
  padding: 1.25rem;
  border-radius: calc(var(--radius) + 8px);
  background: linear-gradient(90deg, rgba(31,95,168,0.14), rgba(224,122,47,0.12));
  border: 1px solid rgba(19,35,58,0.10);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ---------
   Footer
--------- */
.site-footer{
  border-top: 1px solid var(--border);
  background: rgba(255,255,255,0.6);
  padding: 2rem 0;
}
.footer-inner{
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-brand{ font-weight: 900; }
.footer-note{ color: var(--muted); max-width: 40ch; margin-top: 0.25rem; }
.footer-links{
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}
.footer-links a{
  color: var(--text);
  padding: 0.3rem 0.5rem;
  border-radius: 10px;
}
.footer-links a:hover{
  background: rgba(31, 95, 168, 0.08);
  text-decoration: none;
}
.footer-small{ color: var(--muted); }

/* ---------
   Responsive
--------- */
@media (max-width: 980px){
  .grid-4{ grid-template-columns: repeat(2, 1fr); }
  .grid-3{ grid-template-columns: repeat(2, 1fr); }
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-illus{ min-height: 180px; max-height: 300px; }
}

@media (max-width: 560px){
  .grid-4, .grid-3, .grid-2{ grid-template-columns: 1fr; }
}

/* Mobile nav breakpoint */
@media (max-width: 768px){
  .brand-tagline{ display: none; }

  .nav-toggle{ display: block; }

  .header-inner{
    position: relative;
  }

  .site-nav{
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(19, 35, 58, 0.15);
    margin-top: 0.5rem;
    padding: 0.5rem;
    z-index: 100;
  }

  .site-nav.is-open{
    display: flex;
  }

  .site-nav a{
    padding: 0.75rem 1rem;
    border-radius: 8px;
  }

  .site-nav a:hover{
    background: rgba(31, 95, 168, 0.08);
  }

  .site-nav .nav-cta{
    margin-top: 0.5rem;
    text-align: center;
  }
}

/* ---------
   Page header
--------- */
.page-header{
  margin-bottom: 2rem;
}
.page-title{
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}
.page-intro{
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 1rem;
  max-width: 65ch;
}

/* ---------
   Pills (category/tag filters)
--------- */
.pills{
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}
.pill{
  display: inline-block;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  background: rgba(31, 95, 168, 0.08);
  color: var(--text);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 120ms ease;
}
.pill:hover{
  background: rgba(31, 95, 168, 0.15);
  text-decoration: none;
}
.pill-active{
  background: var(--primary);
  color: #fff;
}
.pill-active:hover{
  background: #1a5393;
}

/* ---------
   Card enhancements
--------- */
.card-thumb{
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: calc(var(--radius) - 4px);
  margin-bottom: 0.75rem;
}
.card-title{
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0.35rem 0 0;
}
.card-desc{
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0.45rem 0 0;
  line-height: 1.45;
}
.card-category{
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.card-meta{
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

.card-wideimage-scroll{
  overflow-x: auto;
  overflow-y: hidden;
  margin-bottom: 0.75rem;
  border-radius: calc(var(--radius) - 4px);
  background: #f5f5f5;
  min-width: 0;
  width: 100%;
}
.card-wideimage-scroll img{
  display: block;
  height: 150px;
  width: auto;
  max-width: none;
}

/* Prevent grid blowout from wide images */
.grid .card{
  min-width: 0;
}

/* ---------
   Video feed
--------- */
.video-feed{
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.video-item{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}
.video-item:last-child{
  border-bottom: none;
  padding-bottom: 0;
}
.video-embed{
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: #000;
}
.video-embed iframe{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.video-info{
  padding-top: 0.25rem;
}
.video-category{
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.video-title{
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0.35rem 0 0;
  line-height: 1.3;
}
.video-bonus{
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}
.bonus-link{
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(224, 122, 47, 0.12);
  color: var(--accent);
  text-decoration: none;
  border: 1px solid rgba(224, 122, 47, 0.2);
}
.bonus-link:hover{
  background: rgba(224, 122, 47, 0.2);
  text-decoration: none;
}
.bonus-link-desmos{
  background: rgba(31, 95, 168, 0.12);
  color: var(--primary);
  border-color: rgba(31, 95, 168, 0.2);
}
.bonus-link-desmos:hover{
  background: rgba(31, 95, 168, 0.2);
}
.video-course{
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
  font-style: italic;
}

@media (max-width: 768px){
  .video-item{
    grid-template-columns: 1fr;
  }
}

/* ---------
   Contact page
--------- */
.contact-email{
  display: block;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.1rem;
  background: var(--bg);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  margin: 1rem 0;
  text-align: center;
  user-select: all;
}
.contact-checklist{
  margin: 0.75rem 0;
  padding-left: 1.25rem;
}
.contact-checklist li{
  margin-bottom: 0.35rem;
  color: var(--muted);
}
.copy-status{
  display: block;
  font-size: 0.85rem;
  color: var(--primary);
  min-height: 1.25rem;
  margin-top: 0.5rem;
}

/* ---------
   Section titles
--------- */
.section-title{
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
}
.section-intro{
  color: var(--muted);
  font-size: 1rem;
  margin: 0 0 1rem;
}

/* ---------
   Experiment writeup layout
--------- */
.experiment-writeup{
  max-width: 800px;
  margin: 0 auto;
}

.experiment-header{
  margin-bottom: 2rem;
}

.experiment-title{
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 0.75rem;
  line-height: 1.2;
}

.experiment-description{
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 1rem;
  max-width: 65ch;
}

.experiment-categories{
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill-small{
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
}

.experiment-video{
  margin-bottom: 2rem;
}

.video-wrapper{
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: #000;
}

.video-wrapper iframe{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.experiment-content{
  line-height: 1.7;
}

.experiment-content h1{
  font-size: 1.75rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.experiment-content h2{
  font-size: 1.35rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.experiment-content h3{
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.experiment-content p{
  margin: 0 0 1rem;
}

.experiment-content ul,
.experiment-content ol{
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

.experiment-content img{
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin: 1rem 0;
}

.experiment-preview{
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.experiment-preview h2{
  margin-top: 0;
  margin-bottom: 1rem;
}

.experiment-preview-scroll{
  overflow-x: auto;
  overflow-y: hidden;
  border-radius: var(--radius);
  background: #f5f5f5;
  padding: 1rem;
}

.experiment-preview-scroll img{
  display: block;
  height: 400px;
  width: auto;
  max-width: none;
  margin: 0;
  border-radius: calc(var(--radius) - 4px);
}

.experiment-downloads{
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.experiment-downloads h2{
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.experiment-downloads-note{
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 1rem;
}

.experiment-downloads-list{
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.experiment-footer{
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

/* ---------
   Experiment post cards (horizontal summary)
--------- */
.experiment-writeups-section{
  margin-bottom: 2.5rem;
}

.experiment-post-cards{
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.experiment-post-card{
  display: flex;
  align-items: stretch;
  gap: 1rem;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.experiment-post-card:hover{
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(19, 35, 58, 0.14);
  text-decoration: none;
}

.experiment-post-card-thumb{
  flex-shrink: 0;
  width: 140px;
  height: 100px;
  border-radius: calc(var(--radius) - 4px);
  overflow: hidden;
  background: #f5f5f5;
}

.experiment-post-card-thumb img{
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.experiment-post-card-content{
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.experiment-post-card-title{
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  line-height: 1.3;
}

.experiment-post-card-desc{
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 0.5rem;
  line-height: 1.45;
}

.experiment-post-card-cats{
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.experiment-post-card-arrow{
  flex-shrink: 0;
  display: flex;
  align-items: center;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

@media (max-width: 600px){
  .experiment-post-card{
    flex-direction: column;
  }
  .experiment-post-card-thumb{
    width: 100%;
    height: 150px;
  }
  .experiment-post-card-arrow{
    margin-top: 0.5rem;
  }
}

/* ---------
   Breadcrumb navigation
--------- */
.breadcrumb{
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  color: var(--muted);
}

.breadcrumb a{
  color: var(--muted);
  text-decoration: none;
}

.breadcrumb a:hover{
  color: var(--primary);
  text-decoration: underline;
}

.breadcrumb-sep{
  color: var(--muted);
  opacity: 0.5;
}

.breadcrumb-current{
  color: var(--text);
  font-weight: 500;
}

/* ---------
   Modal
--------- */
.modal{
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal[aria-hidden="true"]{
  display: none;
}

.modal-overlay{
  position: absolute;
  inset: 0;
  background: rgba(19, 35, 58, 0.5);
  backdrop-filter: blur(4px);
  cursor: pointer;
}

.modal-content{
  position: relative;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 20px 50px rgba(19, 35, 58, 0.25);
  max-width: 420px;
  width: 100%;
  animation: modalIn 200ms ease;
}

@keyframes modalIn{
  from{
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to{
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-close{
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 8px;
}

.modal-close:hover{
  background: rgba(19, 35, 58, 0.08);
  color: var(--text);
}

.modal-body{
  padding: 2rem;
}

.modal-title{
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
}

.modal-desc{
  color: var(--muted);
  margin: 0 0 1.5rem;
}

/* ---------
   Form inputs
--------- */
.form-group{
  margin-bottom: 0.75rem;
}

.form-input{
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.form-input:focus{
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(31, 95, 168, 0.15);
}

.form-input::placeholder{
  color: var(--muted);
}

.form-submit{
  width: 100%;
  margin-top: 0.5rem;
}

.form-submit:disabled{
  opacity: 0.7;
  cursor: not-allowed;
}

/* Visually hidden (for accessible labels) */
.visually-hidden{
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Success/error states */
.modal-success .modal-title{
  color: #059669;
}

.modal-error .modal-title{
  color: #dc2626;
}

/* ---------
   Clubs/Patreon page
--------- */
.card-center{
  text-align: center;
}

.card-icon{
  width: 48px;
  height: 48px;
  margin: 0 auto 0.75rem;
  color: var(--primary);
}

.card-icon svg{
  width: 100%;
  height: 100%;
}

.info-card{
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.info-card h2{
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.info-card p{
  margin: 0 0 1rem;
}

.info-card-highlight{
  background: linear-gradient(135deg, rgba(31, 95, 168, 0.08), rgba(224, 122, 47, 0.06));
  border-color: rgba(31, 95, 168, 0.15);
}

.info-list{
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.info-list li{
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.info-list li:last-child{
  border-bottom: none;
}

.text-muted{
  color: var(--muted);
}

/* Activity cards (horizontal image + content) */
.activity-cards{
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.activity-card{
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  align-items: center;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.activity-card-reverse{
  grid-template-columns: 1fr 280px;
}

.activity-card-reverse .activity-card-image{
  order: 2;
}

.activity-card-reverse .activity-card-content{
  order: 1;
}

.activity-card-image{
  display: flex;
  align-items: center;
  justify-content: center;
}

.activity-card-image img{
  max-width: 100%;
  max-height: 240px;
  object-fit: contain;
}

.activity-card-content h3{
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.activity-tagline{
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1rem;
}

.activity-features{
  list-style: none;
  padding: 0;
  margin: 0;
}

.activity-features li{
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--muted);
}

.activity-features li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
}

.benefit-list{
  list-style: disc;
  padding-left: 1.25rem;
  margin: 1rem 0 0;
}

.benefit-list li{
  padding: 0.35rem 0;
  color: var(--text);
}

@media (max-width: 768px){
  .activity-card,
  .activity-card-reverse{
    grid-template-columns: 1fr;
  }

  .activity-card-reverse .activity-card-image,
  .activity-card-reverse .activity-card-content{
    order: unset;
  }

  .activity-card-image{
    max-height: 200px;
  }

  .activity-card-image img{
    max-height: 180px;
  }
}

/* ---------
   Collapsible sections (details/summary)
--------- */
.collapsible{
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.collapsible summary{
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  user-select: none;
  padding: 0.25rem 0;
}

.collapsible summary::-webkit-details-marker{
  display: none;
}

.collapsible summary::before{
  content: "▸";
  font-size: 0.9rem;
  color: var(--primary);
  transition: transform 200ms ease;
}

.collapsible[open] summary::before{
  transform: rotate(90deg);
}

.collapsible summary:hover{
  color: var(--primary);
}

.collapsible-content{
  padding: 0.5rem 0 0.5rem 1.25rem;
}

.collapsible-content p:first-child{
  margin-top: 0;
}

.collapsible-content p:last-child{
  margin-bottom: 0;
}

.collapsible-content ul{
  margin: 0.5rem 0;
  padding-left: 1.5rem;
}

.collapsible-content li{
  margin-bottom: 0.35rem;
}

/* ---------
   Testimonials (as list)
--------- */
.testimonial-list{
  list-style: none;
  padding: 0;
  margin: 0;
}

.testimonial-list li{
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.testimonial-list li:last-child{
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.testimonial-text{
  font-style: italic;
  margin: 0 0 0.5rem;
  line-height: 1.6;
}

.testimonial-author{
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
}