:root{
  /* Theme tokens (default: light) */
  --paper:#fcfcfd;
  --ink:#101216;
  --muted:#5b6472;
  --card: rgba(255,255,255,.84);
  --line: rgba(16,18,22,.14);

  --shadow: 0 20px 60px rgba(0,0,0,.18);
  --shadow2: 0 10px 30px rgba(0,0,0,.14);

  /* Accents */
  --gold:#d7bb56;
  --gold2:#a88c37;
  --navy:#0b1730;

  --night:#050b13;
  --night2:#0b1220;

  --neon:#46b6ec;
  --neon2:#4aa4e6;

  --radius:22px;

  /* Logo (light) */
  --logo-bg:#ffffff;
  --logo-ink: var(--navy);
  --logo-accent: var(--gold);
  --logo-border: rgba(11,23,48,.18);

  /* Hero readability */
  --hero-bg-opacity:.38;
  --hero-readability: linear-gradient(90deg,
    rgba(252,252,253,.94) 0%,
    rgba(252,252,253,.88) 44%,
    rgba(252,252,253,.18) 74%,
    rgba(252,252,253,0) 100%);
}

/* Dark theme */
html[data-theme="dark"]{
  --paper:#050b13;
  --ink:#eef3ff;
  --muted: rgba(238,243,255,.72);
  --card: rgba(255,255,255,.06);
  --line: rgba(255,255,255,.12);

  --shadow: 0 22px 70px rgba(0,0,0,.55);
  --shadow2: 0 14px 40px rgba(0,0,0,.45);

  /* Logo (dark) */
  --logo-bg:#000000;
  --logo-ink:#a8e6ff;
  --logo-accent: var(--neon);
  --logo-border: rgba(70,182,236,.30);

  --hero-bg-opacity:.26;
  --hero-readability: linear-gradient(90deg,
    rgba(5,11,19,.92) 0%,
    rgba(5,11,19,.86) 52%,
    rgba(5,11,19,.30) 78%,
    rgba(5,11,19,0) 100%);

  color-scheme: dark;
}


*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--ink);
  background:var(--paper);
  line-height:1.5;
  overflow-x:hidden;
}

a{color:inherit}
small{color:var(--muted)}

.skip{
  position:absolute; left:-999px; top:auto;
  width:1px; height:1px; overflow:hidden;
}
.skip:focus{
  left:16px; top:16px; width:auto; height:auto;
  padding:10px 12px;
  background:#fff; border:1px solid var(--line);
  border-radius:12px; z-index:9999;
}

.wrap{max-width:1120px; margin:0 auto; padding:0 18px}

header{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(14px);
  background: rgba(252,252,253,.72);
  border-bottom:1px solid var(--line);
}

.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:14px; padding:12px 0;
}

.brand{
  display:flex; align-items:center; gap:12px;
  text-decoration:none;
}
.logo{
  width:42px; height:42px;
  border-radius:14px;
  display:grid; place-items:center;
  position:relative;
  background: var(--logo-bg);
  border:1px solid var(--logo-border);
  box-shadow: 0 10px 25px rgba(0,0,0,.10);
  overflow:hidden;
}
.logo::before{
  content:"";
  position:absolute; inset:6px;
  border-radius:12px;
  border:1px solid rgba(0,0,0,.10);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,.15),
    0 0 0 1px rgba(0,0,0,.02);
}
html[data-theme="dark"] .logo::before{
  border-color: rgba(255,255,255,.10);
  box-shadow:
    inset 0 0 0 1px rgba(70,182,236,.18),
    0 0 22px rgba(70,182,236,.10);
}
.logo::after{
  content:"";
  position:absolute; inset:-12px;
  background:
    radial-gradient(circle at 30% 25%, rgba(215,187,86,.20), transparent 55%),
    radial-gradient(circle at 70% 70%, rgba(215,187,86,.14), transparent 56%);
  pointer-events:none;
}
html[data-theme="dark"] .logo::after{
  background:
    radial-gradient(circle at 30% 25%, rgba(70,182,236,.22), transparent 58%),
    radial-gradient(circle at 70% 70%, rgba(74,164,230,.14), transparent 60%);
}
.logo-mark{
  position:relative;
  z-index:2;
  font-weight:900;
  letter-spacing:-.04em;
  color: var(--logo-ink);
}
html[data-theme="dark"] .logo-mark{
  text-shadow: 0 0 14px rgba(70,182,236,.35);
}
.brand strong{font-size:15px; letter-spacing:.02em}
.brand span{display:block; font-size:12px; color:var(--muted); margin-top:1px}

nav{
  display:flex; align-items:center; gap:10px;
}
nav a{
  text-decoration:none;
  padding:10px 10px;
  border-radius:12px;
  color:rgba(16,18,22,.78);
}
nav a:hover{background:rgba(16,18,22,.06)}
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:10px;
  padding:12px 14px;
  border-radius:14px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.7);
  cursor:pointer;
  text-decoration:none;
  box-shadow: 0 6px 18px rgba(0,0,0,.06);
}
.btn:hover{transform: translateY(-1px)}
.btn.primary{
  background: linear-gradient(135deg, rgba(215,187,86,.95), rgba(168,140,55,.75));
  border-color: rgba(168,140,55,.55);
  color:#111;
  font-weight:700;
}
.btn.ghost{
  background: rgba(16,18,22,.04);
}

.hero{
  position:relative;
  min-height: calc(100vh - 68px);
  display:grid; align-items:center;
  padding: 34px 0 50px;
}
.hero::before,.hero::after{z-index:0;}
.hero::before{
  content:"";
  position:absolute; inset:0;
  background-image: url("assets/pattern-geo.jpg");
  background-size:cover; background-position:center;
  opacity: var(--hero-bg-opacity);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute; inset:0;
  background: var(--hero-readability);
  pointer-events:none;
}
.hero-grid{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap:26px;
  align-items:center;
}
.kicker{
  display:inline-flex; align-items:center; gap:10px;
  padding:8px 12px;
  border-radius:999px;
  background: rgba(252,252,253,.78);
  border:1px solid rgba(16,18,22,.14);
  font-size:13px;
  color:rgba(16,18,22,.86);
  backdrop-filter: blur(10px);
}
.k-dot{
  width:10px; height:10px; border-radius:999px;
  background: radial-gradient(circle, var(--gold), var(--gold2));
  box-shadow: 0 0 0 4px rgba(215,187,86,.18);
}
h1{
  font-size: clamp(34px, 4.2vw, 54px);
  line-height:1.05;
  margin:14px 0 12px;
  letter-spacing:-.02em;
  color: rgba(16,18,22,.96);
  text-shadow: 0 1px 0 rgba(255,255,255,.35);
}
.lede{
  font-size: 17px;
  color: rgba(16,18,22,.88);
  max-width: 54ch;
}
.cta{
  display:flex; flex-wrap:wrap; gap:12px;
  margin-top:18px;
}
.badges{
  display:flex; flex-wrap:wrap; gap:10px; margin-top:16px;
}
.badge{
  font-size:12px;
  padding:8px 10px;
  border-radius:999px;
  border:1px solid rgba(16,18,22,.14);
  background: rgba(252,252,253,.84);
  color: rgba(16,18,22,.82);
  backdrop-filter: blur(10px);
}

.hero-media{
  position:relative;
  border-radius: var(--radius);
  overflow:hidden;
  border:1px solid rgba(16,18,22,.12);
  box-shadow: var(--shadow);
  background: #000;
}
.hero-media video{
  width:100%;
  height:auto;
  display:block;
}
.hero-media .overlay{
  position:absolute; inset:0;
  background: radial-gradient(circle at 20% 10%, rgba(215,187,86,.25), transparent 45%),
              radial-gradient(circle at 80% 20%, rgba(70,182,236,.25), transparent 46%),
              linear-gradient(to bottom, rgba(0,0,0,.15), rgba(0,0,0,.55));
  pointer-events:none;
}

section{padding:72px 0}
.section-head{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap:18px; margin-bottom:22px;
}
.section-head h2{
  font-size: clamp(24px, 3vw, 34px);
  margin:0;
  letter-spacing:-.02em;
}
.section-head p{margin:0; color:rgba(16,18,22,.74); max-width:70ch}

.grid{
  display:grid;
  gap:16px;
}
.grid.cols-3{grid-template-columns: repeat(3, minmax(0,1fr))}
.grid.cols-2{grid-template-columns: repeat(2, minmax(0,1fr))}
.card{
  border-radius: var(--radius);
  border:1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow2);
  overflow:hidden;
  position:relative;
}
.card .pad{padding:18px}
.card h3{margin:0 0 8px; font-size:18px}
.card p{margin:0; color:rgba(16,18,22,.74)}
.card img{width:100%; height:auto; display:block}

.timeline{
  display:grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap:16px;
}
.step{
  position:relative;
}
.step .tag{
  position:absolute; top:14px; left:14px;
  padding:6px 10px; border-radius:999px;
  font-size:12px;
  background: rgba(0,0,0,.45);
  color: #fff;
  border:1px solid rgba(255,255,255,.25);
  backdrop-filter: blur(10px);
}

.darkband{
  background: radial-gradient(circle at 30% 10%, rgba(70,182,236,.16), transparent 38%),
              radial-gradient(circle at 75% 0%, rgba(215,187,86,.10), transparent 42%),
              linear-gradient(180deg, var(--night), var(--night2));
  color: #eef3ff;
  border-top:1px solid rgba(255,255,255,.06);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.darkband .section-head p{color: rgba(238,243,255,.76)}
.darkband .card{
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.10);
  box-shadow: 0 18px 60px rgba(0,0,0,.35);
}
.darkband .card p{color: rgba(238,243,255,.78)}
.darkband .badge{
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.10);
  color: rgba(238,243,255,.78);
}
.darkband a.btn{
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.14);
  color:#eef3ff;
}
.darkband a.btn.primary{
  color:#111;
  background: linear-gradient(135deg, rgba(70,182,236,.95), rgba(74,164,230,.75));
  border-color: rgba(70,182,236,.45);
}

.list{
  margin:0; padding-left:18px;
  color: rgba(16,18,22,.76);
}
.darkband .list{color: rgba(238,243,255,.78)}

.footer{
  position:relative;
  padding:72px 0 34px;
  color:#eef3ff;
  background: #03070d;
  overflow:hidden;
}
.footer::before{
  content:"";
  position:absolute; inset:0;
  background-image:url("assets/stairs-footer.jpg");
  background-size:cover; background-position:center;
  opacity:1;
}
.footer .wrap{position:relative}
.footer a{color:#eef3ff; opacity:.9}
.footer small{color: rgba(238,243,255,.70)}
.footer .fine{
  margin-top:22px;
  display:flex; flex-wrap:wrap; gap:12px;
  align-items:center; justify-content:space-between;
  border-top:1px solid rgba(255,255,255,.10);
  padding-top:16px;
}

.pillrow{display:flex; flex-wrap:wrap; gap:10px}

.reveal{
  opacity:0;
  transform: translateY(14px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.on{
  opacity:1;
  transform:none;
}

@media (max-width: 960px){
  .hero-grid{grid-template-columns: 1fr}
  .hero::after{background: var(--hero-readability);}
  .timeline{grid-template-columns: 1fr}
  .grid.cols-3{grid-template-columns: 1fr}
  .grid.cols-2{grid-template-columns: 1fr}
  nav{display:none}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .btn:hover{transform:none}
  .reveal{transition:none}
}

.theme-icon{
  width:16px; height:16px; display:inline-block;
  border-radius:999px;
  box-shadow: inset 0 0 0 1px var(--line);
  background: radial-gradient(circle at 35% 35%, var(--gold), var(--gold2));
}
html[data-theme="dark"] .theme-icon{
  background: radial-gradient(circle at 35% 35%, var(--neon), var(--neon2));
}

/* Theme-driven readability tweaks */
html[data-theme="dark"] body{
  background: var(--paper);
  color: var(--ink);
}
html[data-theme="dark"] header{
  background: rgba(5,11,19,.72);
}
html[data-theme="dark"] nav a{
  color: rgba(238,243,255,.82);
}
html[data-theme="dark"] nav a:hover{
  background: rgba(255,255,255,.06);
}
html[data-theme="dark"] .kicker{
  background: rgba(255,255,255,.06);
  border-color: var(--line);
  color: rgba(238,243,255,.86);
}
html[data-theme="dark"] h1{
  color: rgba(238,243,255,.96);
  text-shadow: 0 1px 0 rgba(0,0,0,.45);
}
html[data-theme="dark"] .lede{
  color: rgba(238,243,255,.82);
}
html[data-theme="dark"] .badge{
  background: rgba(255,255,255,.06);
  border-color: var(--line);
  color: rgba(238,243,255,.78);
}
html[data-theme="dark"] .btn{
  background: rgba(255,255,255,.06);
  border-color: var(--line);
  color: rgba(238,243,255,.92);
  box-shadow: 0 10px 28px rgba(0,0,0,.45);
}
html[data-theme="dark"] .btn.primary{
  color:#061018;
  background: linear-gradient(135deg, rgba(70,182,236,.95), rgba(74,164,230,.75));
  border-color: rgba(70,182,236,.45);
}

/* Theme toggle visibility */
.btn.theme-toggle{
  padding:12px 14px;
  gap:10px;
  width:auto;
}
.theme-label{
  font-weight:700;
  font-size:13px;
  letter-spacing:.01em;
}
.theme-state{
  font-size:12px;
  padding:6px 8px;
  border-radius:999px;
  border:1px solid var(--line);
  background: color-mix(in oklab, var(--paper) 70%, transparent);
  color: color-mix(in oklab, var(--ink) 78%, transparent);
}
html[data-theme="dark"] .theme-state{
  background: rgba(255,255,255,.06);
  color: rgba(238,243,255,.78);
}

/* First-visit hint (subtle pulse) */
.theme-toggle.hint{
  animation: jtPulse 1.8s ease-in-out 2;
  box-shadow: 0 0 0 6px color-mix(in oklab, var(--gold) 18%, transparent), var(--shadow2);
}
html[data-theme="dark"] .theme-toggle.hint{
  box-shadow: 0 0 0 6px rgba(70,182,236,.18), var(--shadow2);
}
@keyframes jtPulse{
  0%{transform: translateY(0)}
  50%{transform: translateY(-1px)}
  100%{transform: translateY(0)}
}