/* ============================================================
   AI Skills Alliance — design tokens
   ============================================================ */
:root{
  --ink:        #171719;   /* brand near-black, page base      */
  --ink-raised: #1f1f22;   /* raised panels on dark            */
  --ink-sunken: #121214;   /* footer / recessed bands          */
  --paper:      #f6f6f4;   /* light band                       */
  --paper-card: #ffffff;
  --green:      #32da80;   /* brand accent                     */
  --green-soft: #5de29b;   /* hover state                      */
  --white:      #ffffff;
  --text-dim:   rgba(255,255,255,.68);
  --text-dimmer:rgba(255,255,255,.52);
  --line:       rgba(255,255,255,.11);
  --line-dark:  rgba(23,23,25,.12);
  --ink-text:   #171719;
  --ink-text-dim: rgba(23,23,25,.66);

  --r-lg: 22px;
  --r-md: 14px;
  --r-sm: 10px;

  --shell: 1200px;
  --gutter: clamp(20px, 5vw, 48px);
  --band: clamp(72px, 9vw, 128px);

  --sans: 'Inter Tight', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --display: 'Segoe UI', 'Inter Tight', system-ui, sans-serif;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--ink);
  color:var(--white);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }

h1,h2,h3,h4{ font-family:var(--display); font-weight:700; margin:0; line-height:1.1; letter-spacing:-.02em; }
p{ margin:0; }

.shell{ width:100%; max-width:var(--shell); margin-inline:auto; padding-inline:var(--gutter); }
.band{ padding-block:var(--band); }

/* focus visibility */
a:focus-visible, button:focus-visible{
  outline:2px solid var(--green);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  font-family:var(--sans); font-size:1rem; font-weight:600;
  padding:.85rem 1.6rem; border-radius:var(--r-sm);
  border:1px solid transparent; cursor:pointer;
  transition:background-color .2s ease, border-color .2s ease, color .2s ease;
}
.btn-primary{ background:var(--green); color:#08130c; border-color:var(--green); }
.btn-primary:hover{ background:var(--green-soft); border-color:var(--green-soft); }
.btn-ghost{ background:transparent; color:var(--white); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--white); }
.btn-dark{ background:var(--ink); color:var(--white); border-color:var(--ink); }
.btn-dark:hover{ background:#2c2c31; border-color:#2c2c31; }

/* ============================================================
   Navigation
   ============================================================ */
.nav{
  position:fixed; inset:0 0 auto 0; z-index:100;
  background:rgba(23,23,25,0);
  border-bottom:1px solid transparent;
  transition:background-color .3s ease, border-color .3s ease, backdrop-filter .3s ease;
}
.nav.is-stuck{
  background:rgba(23,23,25,.92);
  backdrop-filter:saturate(150%) blur(12px);
  border-bottom-color:var(--line);
}
.nav-inner{
  display:flex; align-items:center; gap:2rem;
  min-height:82px;
}
.nav-logo img{ height:38px; width:auto; }
.nav-links{
  display:flex; align-items:center; gap:2rem;
  margin-left:auto; list-style:none; padding:0;
}
.nav-links a{
  font-size:1rem; color:var(--text-dim); padding-block:.35rem;
  border-bottom:1px solid transparent; transition:color .2s ease, border-color .2s ease;
}
.nav-links a:hover{ color:var(--white); }
.nav-links a[aria-current="page"]{ color:var(--white); border-bottom-color:var(--green); }
.nav-cta{ margin-left:.5rem; }
.nav-toggle{
  display:none; margin-left:auto; background:none; border:0; padding:.5rem;
  width:44px; height:44px; cursor:pointer;
}
.nav-toggle span{
  display:block; height:2px; background:var(--white); border-radius:2px;
  margin:5px auto; width:24px; transition:transform .25s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

@media (max-width:900px){
  .nav-toggle{ display:block; }
  .nav-menu{
    position:absolute; left:0; right:0; top:100%;
    background:rgba(18,18,20,.98); backdrop-filter:blur(12px);
    border-bottom:1px solid var(--line);
    padding:1rem var(--gutter) 1.75rem;
    display:none;
  }
  .nav-menu.is-open{ display:block; }
  .nav-links{ flex-direction:column; align-items:flex-start; gap:.25rem; margin:0; }
  .nav-links a{ display:block; padding:.75rem 0; font-size:1.1rem; }
  .nav-cta{ margin:1rem 0 0; display:block; }
  .nav-cta .btn{ width:100%; }
}
@media (min-width:901px){
  .nav-menu{ display:contents; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero{
  position:relative;
  padding-top:clamp(130px, 14vw, 190px);
  padding-bottom:clamp(60px, 8vw, 104px);
  overflow:hidden;
}
.hero::before{ /* soft brand glow, kept very low key */
  content:""; position:absolute; z-index:0;
  width:640px; height:640px; left:-260px; top:-200px;
  background:radial-gradient(circle, rgba(50,218,128,.16), transparent 62%);
  pointer-events:none;
}
.hero-grid{
  position:relative; z-index:1;
  display:grid; grid-template-columns:1.05fr .95fr;
  gap:clamp(2.5rem, 5vw, 5rem); align-items:center;
}
.badge{
  display:inline-flex; align-items:center; gap:.55rem;
  background:var(--ink-raised); border:1px solid var(--line);
  border-radius:999px; padding:.4rem .95rem .4rem .45rem;
  font-size:.9rem; color:var(--text-dim); margin-bottom:1.6rem;
}
.badge img{ height:16px; width:auto; }
.badge > span{ padding-left:.55rem; }
.hero h1{
  font-size:clamp(2.55rem, 5.4vw, 4.1rem);
  max-width:14ch;
  margin-bottom:1.4rem;
}
.hero h1 .rule{
  display:block; width:64px; height:4px; background:var(--green);
  border-radius:2px; margin-top:1.5rem;
}
.hero-lead{
  color:var(--text-dim); font-size:1.12rem; max-width:52ch; margin-bottom:2.2rem;
}
.hero-actions{ display:flex; flex-wrap:wrap; gap:.85rem; }
.hero-figure{
  position:relative; border-radius:var(--r-lg); overflow:hidden;
  border:1px solid var(--line); background:var(--ink-raised);
}
.hero-figure img{ width:100%; height:auto; aspect-ratio:1/1; object-fit:cover; }
.hero-note{
  position:absolute; left:0; right:0; bottom:0;
  padding:2.4rem 1.5rem 1.25rem;
  background:linear-gradient(to top, rgba(15,15,17,.95) 20%, rgba(15,15,17,.55) 60%, transparent);
  font-size:.95rem; color:var(--text-dim);
}

@media (max-width:960px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero h1{ max-width:18ch; }
  .hero-figure{ order:-1; }
}

/* first-load reveal (single, orchestrated) */
@media (prefers-reduced-motion:no-preference){
  .reveal{ opacity:0; transform:translateY(14px); animation:rise .7s cubic-bezier(.22,.8,.3,1) forwards; }
  .reveal:nth-child(2){ animation-delay:.12s; }
  @keyframes rise{ to{ opacity:1; transform:none; } }
}

/* ============================================================
   Pillars
   ============================================================ */
.section-head{ max-width:62ch; margin-bottom:clamp(2.5rem,4vw,3.5rem); }
.section-head h2{ font-size:clamp(2rem, 3.4vw, 2.8rem); margin-bottom:1rem; }
.section-head p{ color:var(--text-dim); }

.pillars{
  display:grid; grid-template-columns:repeat(12,1fr); gap:1.25rem;
}
.pillar{
  background:var(--ink-raised); border:1px solid var(--line);
  border-radius:var(--r-lg); padding:2rem;
  display:flex; flex-direction:column; gap:.85rem;
}
.pillar h3{ font-size:1.35rem; }
.pillar p{ color:var(--text-dim); font-size:1rem; }
.pillar-wide{ grid-column:span 7; }
.pillar-narrow{ grid-column:span 5; }
.pillar-media{
  margin-top:auto; padding-top:1.5rem;
}
.pillar-media img{
  width:100%; height:200px; object-fit:cover; border-radius:var(--r-md);
}
.pillar-mark{
  width:34px; height:34px; border-radius:9px;
  background:rgba(50,218,128,.14); color:var(--green);
  display:grid; place-items:center; margin-bottom:.35rem;
}
.pillar-mark svg{ width:18px; height:18px; }

@media (max-width:900px){
  .pillar-wide, .pillar-narrow{ grid-column:span 12; }
  .pillar-media img{ height:180px; }
}

/* ============================================================
   Partner strip (sits inside the light band)
   ============================================================ */
.partners{
  display:flex; align-items:center; gap:clamp(1.5rem,4vw,3.5rem); flex-wrap:wrap;
  border-top:1px solid var(--line-dark); border-bottom:1px solid var(--line-dark);
  padding-block:clamp(1.75rem,3vw,2.5rem);
  margin-bottom:clamp(2.5rem,4vw,3.5rem);
}
.partners p{ color:var(--ink-text-dim); font-size:.98rem; }
.partners ul{
  list-style:none; margin:0; padding:0; flex:1;
  display:flex; align-items:center; justify-content:space-between;
  gap:clamp(1.5rem,4vw,3rem); flex-wrap:wrap;
}
.partners img{ height:62px; width:auto; object-fit:contain; }
@media (max-width:700px){
  .partners ul{ justify-content:flex-start; }
  .partners img{ height:48px; }
}

/* ============================================================
   Explore (light band)
   ============================================================ */
.light{ background:var(--paper); color:var(--ink-text); }
.light .section-head p{ color:var(--ink-text-dim); }

.cards{ display:grid; grid-template-columns:repeat(3,1fr); gap:1.25rem; }
.card{
  background:var(--paper-card); border:1px solid var(--line-dark);
  border-radius:var(--r-lg); padding:2rem;
  display:flex; flex-direction:column; gap:.75rem;
  transition:border-color .2s ease, transform .2s ease;
}
.card:hover{ border-color:var(--ink-text); }
.card h3{ font-size:1.4rem; }
.card p{ color:var(--ink-text-dim); font-size:1rem; }
.card ul{
  list-style:none; margin:.25rem 0 0; padding:0;
  color:var(--ink-text-dim); font-size:.97rem;
}
.card li{ padding:.45rem 0; border-top:1px solid var(--line-dark); }
.card-link{
  margin-top:auto; padding-top:1.5rem;
  font-weight:600; color:var(--ink-text);
  border-bottom:2px solid var(--green); align-self:flex-start;
  padding-bottom:2px;
}
@media (max-width:900px){ .cards{ grid-template-columns:1fr; } }

/* ============================================================
   Team
   ============================================================ */
.team{ display:grid; grid-template-columns:repeat(3,1fr); gap:1.25rem; }
.member{
  background:var(--paper-card); border:1px solid var(--line-dark);
  border-radius:var(--r-lg); padding:1.75rem; text-align:center;
}
.member img{
  width:112px; height:112px; border-radius:50%; object-fit:cover;
  margin:0 auto 1.1rem; background:#ececec;
}
.member h3{ font-size:1.2rem; margin-bottom:.3rem; }
.member p{ color:var(--ink-text-dim); font-size:.97rem; }
@media (max-width:760px){ .team{ grid-template-columns:1fr; } }

/* ============================================================
   Join CTA
   ============================================================ */
.join-inner{
  position:relative; overflow:hidden;
  border:1px solid var(--line); border-radius:var(--r-lg);
  background:var(--ink-raised);
  padding:clamp(2.5rem,6vw,4.5rem);
  display:grid; grid-template-columns:1.3fr auto; gap:2.5rem; align-items:center;
}
.join-inner::after{
  content:""; position:absolute; right:-120px; top:-120px;
  width:420px; height:420px; border-radius:50%;
  background:radial-gradient(circle, rgba(50,218,128,.18), transparent 65%);
  pointer-events:none;
}
.join-inner h2{ font-size:clamp(1.9rem,3.2vw,2.7rem); margin-bottom:1rem; max-width:18ch; }
.join-inner p{ color:var(--text-dim); max-width:52ch; }
.join-actions{ position:relative; z-index:1; }
@media (max-width:860px){
  .join-inner{ grid-template-columns:1fr; }
}

/* ============================================================
   Footer
   ============================================================ */
.footer{ background:var(--ink-sunken); border-top:1px solid var(--line); padding-block:clamp(3rem,5vw,4.5rem); }
.footer-top{
  display:flex; gap:2.5rem; flex-wrap:wrap; align-items:flex-start;
  justify-content:space-between; padding-bottom:2.5rem;
}
.footer-brand img.wordmark{ height:40px; margin-bottom:1.25rem; }
.footer-powered{ display:flex; align-items:center; gap:.85rem; color:var(--text-dim); font-size:.97rem; }
.footer-powered img{ height:18px; width:auto; filter:invert(0); }
.footer-nav{ display:flex; gap:2.5rem; flex-wrap:wrap; }
.footer-nav ul{ list-style:none; margin:0; padding:0; }
.footer-nav h4{ font-size:.98rem; font-weight:600; margin-bottom:.9rem; color:var(--white); }
.footer-nav a{ color:var(--text-dim); font-size:.97rem; line-height:2.1; }
.footer-nav a:hover{ color:var(--green); }
.footer-base{
  border-top:1px solid var(--line); padding-top:1.75rem;
  display:flex; gap:1rem; flex-wrap:wrap; justify-content:space-between;
  color:var(--text-dimmer); font-size:.92rem;
}
.footer-base a{ color:var(--text-dim); }
.footer-base a:hover{ color:var(--white); }

/* ============================================================
   Inner-page hero
   ============================================================ */
.page-hero{
  position:relative; overflow:hidden;
  padding-top:clamp(122px, 13vw, 172px);
  padding-bottom:clamp(48px, 6vw, 76px);
}
.page-hero::before{
  content:""; position:absolute; z-index:0;
  width:560px; height:560px; right:-200px; top:-220px;
  background:radial-gradient(circle, rgba(50,218,128,.14), transparent 62%);
  pointer-events:none;
}
.page-hero .shell{ position:relative; z-index:1; }
.page-hero h1{ font-size:clamp(2.2rem, 4.4vw, 3.4rem); margin-bottom:1.2rem; }
.page-hero p{ color:var(--text-dim); max-width:60ch; font-size:1.1rem; }
.page-hero .rule{ display:block; width:56px; height:4px; background:var(--green); border-radius:2px; margin:1.35rem 0 1.4rem; }

.crumb{ color:var(--text-dimmer); font-size:.95rem; margin-bottom:1rem; }
.crumb a:hover{ color:var(--white); }

/* Wide image band under an inner-page hero */
.hero-band{
  border-radius:var(--r-lg); overflow:hidden; border:1px solid var(--line);
  margin-top:clamp(2rem,4vw,3rem);
}
.hero-band img{ width:100%; height:clamp(220px,32vw,360px); object-fit:cover; }

/* ============================================================
   Events
   ============================================================ */
.event-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:1.25rem; }
.event-grid.three{ grid-template-columns:repeat(3,1fr); }
.event{
  display:flex; flex-direction:column;
  background:var(--ink-raised); border:1px solid var(--line);
  border-radius:var(--r-lg); overflow:hidden;
}
.event-media{ position:relative; }
.event-media img.shot{ width:100%; height:clamp(180px,20vw,240px); object-fit:cover; }
.logo-chip{
  position:absolute; left:1.4rem; bottom:-30px;
  background:var(--white); border-radius:var(--r-md);
  padding:.75rem 1.1rem; height:76px; min-width:110px;
  display:grid; place-items:center; box-shadow:0 8px 24px rgba(0,0,0,.35);
}
.logo-chip img{ max-height:46px; max-width:150px; width:auto; }
.event-body{ padding:2.9rem 1.6rem 1.6rem; display:flex; flex-direction:column; gap:.7rem; flex:1; }
.event-body h3{ font-size:1.3rem; }
.event-body p{ color:var(--text-dim); font-size:1rem; }
.event-meta{
  display:flex; flex-wrap:wrap; gap:.4rem 1rem; align-items:center;
  color:var(--white); font-size:.95rem; font-weight:500;
  padding-top:.2rem;
}
.event-meta .dot{ width:6px; height:6px; border-radius:50%; background:var(--green); }
.event-actions{ margin-top:auto; padding-top:1.25rem; }
@media (max-width:900px){
  .event-grid, .event-grid.three{ grid-template-columns:1fr; }
}

/* ============================================================
   Research
   ============================================================ */
.tier{ margin-top:clamp(2.5rem,4vw,3.5rem); }
.tier:first-of-type{ margin-top:0; }
.tier-head{
  display:flex; align-items:baseline; gap:1rem; flex-wrap:wrap;
  padding-bottom:1rem; border-bottom:1px solid var(--line-dark); margin-bottom:1.25rem;
}
.tier-head h2{ font-size:1.6rem; }
.tier-head span{ color:var(--ink-text-dim); font-size:.97rem; }
.papers{ display:grid; gap:1rem; }
.paper{
  background:var(--paper-card); border:1px solid var(--line-dark);
  border-radius:var(--r-lg); padding:1.6rem 1.75rem;
  display:grid; grid-template-columns:1fr auto; gap:1.5rem; align-items:center;
}
.paper h3{ font-size:1.18rem; margin-bottom:.55rem; }
.paper p{ color:var(--ink-text-dim); font-size:1rem; max-width:78ch; }
.paper .btn{ white-space:nowrap; }
@media (max-width:760px){
  .paper{ grid-template-columns:1fr; }
  .paper .btn{ justify-self:start; }
}

/* ============================================================
   Training
   ============================================================ */
.features{ display:grid; grid-template-columns:repeat(4,1fr); gap:1.25rem; }
.feature{
  background:var(--ink-raised); border:1px solid var(--line);
  border-radius:var(--r-lg); padding:1.75rem;
}
.feature h3{ font-size:1.15rem; margin:.9rem 0 .5rem; }
.feature p{ color:var(--text-dim); font-size:.98rem; }
@media (max-width:1000px){ .features{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:600px){ .features{ grid-template-columns:1fr; } }

.pathways{ display:grid; grid-template-columns:repeat(2,1fr); gap:1.25rem; }
.pathway{
  background:var(--paper-card); border:1px solid var(--line-dark);
  border-radius:var(--r-lg); padding:2rem;
  display:grid; grid-template-columns:auto 1fr; gap:1.25rem; align-items:start;
}
.pathway .num{
  width:42px; height:42px; border-radius:12px; display:grid; place-items:center;
  background:rgba(50,218,128,.16); color:#0f6b3c; font-weight:700; font-size:1.05rem;
}
.pathway h3{ font-size:1.25rem; margin-bottom:.5rem; }
.pathway p{ color:var(--ink-text-dim); font-size:1rem; }
@media (max-width:800px){ .pathways{ grid-template-columns:1fr; } }

/* ============================================================
   Form
   ============================================================ */
.form-wrap{
  background:var(--ink-raised); border:1px solid var(--line);
  border-radius:var(--r-lg); padding:clamp(1.75rem,4vw,3rem);
}
.form-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:1.1rem; }
.form-grid .full{ grid-column:1 / -1; }
.field label{ display:block; font-size:.95rem; color:var(--text-dim); margin-bottom:.45rem; }
.field input[type="text"], .field input[type="email"], .field textarea{
  width:100%; background:#17171a; color:var(--white);
  border:1px solid var(--line); border-radius:var(--r-sm);
  padding:.85rem 1rem; font-family:var(--sans); font-size:1rem;
  transition:border-color .2s ease;
}
.field textarea{ min-height:140px; resize:vertical; }
.field input:focus, .field textarea:focus{ outline:none; border-color:var(--green); }
.field input::placeholder, .field textarea::placeholder{ color:rgba(255,255,255,.34); }
.consent{ display:flex; gap:.7rem; align-items:flex-start; color:var(--text-dim); font-size:.97rem; }
.consent input{ margin-top:.28rem; width:18px; height:18px; accent-color:var(--green); flex:none; }
.consent a{ color:var(--green); border-bottom:1px solid rgba(50,218,128,.4); }
.form-alert{ border-radius:var(--r-sm); padding:.9rem 1.1rem; font-size:.98rem; margin-bottom:1rem; }
.form-alert.ok{ background:rgba(50,218,128,.14); border:1px solid rgba(50,218,128,.4); color:var(--green-soft); }
.form-alert.bad{ background:rgba(255,44,33,.12); border:1px solid rgba(255,44,33,.4); color:#ff9d96; }
.form-aside h2{ font-size:clamp(1.8rem,3vw,2.4rem); margin-bottom:1rem; }
.form-aside p{ color:var(--text-dim); margin-bottom:1.5rem; }
.checklist{ list-style:none; margin:0; padding:0; }
.checklist li{
  display:flex; gap:.75rem; align-items:flex-start;
  color:var(--text-dim); padding:.6rem 0; border-top:1px solid var(--line); font-size:1rem;
}
.checklist li::before{ content:"—"; color:var(--green); }
.split{ display:grid; grid-template-columns:.85fr 1.15fr; gap:clamp(2rem,5vw,4rem); align-items:start; }
@media (max-width:900px){
  .split{ grid-template-columns:1fr; }
  .form-grid{ grid-template-columns:1fr; }
}

/* ---- Event cards on the light band ---- */
.light .event{ background:var(--paper-card); border-color:var(--line-dark); }
.light .event-body p{ color:var(--ink-text-dim); }
.light .event-meta{ color:var(--ink-text); }
.light .logo-chip{ border:1px solid var(--line-dark); box-shadow:0 6px 20px rgba(23,23,25,.08); }
.paper-source{ color:var(--ink-text-dim); font-size:.92rem; margin-bottom:.5rem !important; opacity:.8; }