:root{
  color-scheme: dark;
  --bg:#0b0e13; --panel:#0f1422; --card:#121621; --ink:#eaeef5; --mut:#9aa4b2; --line:#232a36;
  --brand:#4b9cff; --brand-2:#19b36b; --accent:#e05d5d;
  --hover:rgba(255,255,255,.06);
  --radius:16px; --shadow:0 10px 28px rgba(0,0,0,.36);
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#f7f9fc; --panel:#ffffff; --card:#ffffff; --ink:#0f1422; --mut:#5f6c7a; --line:#e6eaf0;
    --brand:#2f6fe4; --brand-2:#19b36b; --accent:#e05d5d; --hover:rgba(0,0,0,.06);
  }
}

*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font: 16px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,"Helvetica Neue",Arial;
}

/* Background blobs */
.bg{position:fixed; inset:0; z-index:-2; overflow:hidden; pointer-events:none}
.bg__blob{position:absolute; opacity:.18; filter: blur(6px)}
.bg__blob--1{width:46vw; right:-12vw; top:-10vh}
.bg__blob--2{width:40vw; left:-8vw; bottom:-10vh}

/* Hero */
.hero{
  position: relative;
  padding: 68px 16px 64px;
  background:
    radial-gradient(1200px 300px at 50% -10%, rgba(75,156,255,.20), transparent 60%),
    linear-gradient(180deg, rgba(20,26,40,.8) 0%, rgba(18,22,33,.8) 60%, transparent 100%);
}
.hero__inner{max-width: 1100px; margin: 0 auto; text-align:center}
.hero__badge{
  display:inline-block; font-size:.8rem; letter-spacing:.15em; text-transform:uppercase;
  color:var(--ink); background:rgba(255,255,255,.08);
  border:1px solid var(--line); padding:6px 10px; border-radius:999px;
}
.hero__title{margin:10px 0 6px; font-size: clamp(26px, 5vw, 44px)}
.hero__subtitle{color:var(--mut)}
.hero__wave{width:100%; height:80px; display:block; margin-top:22px}
.hero__wave path{fill: rgba(255,255,255,.06)}

/* Layout */
.layout{
  display:grid; gap:22px;
  grid-template-columns: 280px 1fr;
  max-width: 1100px; margin: 0 auto; padding: 0 16px 90px;
}
@media (max-width: 980px){
  .layout{ grid-template-columns: 1fr; }
}

/* Sidebar */
.sidebar{
  position: sticky; top: 18px; align-self:start;
  background: var(--panel); border:1px solid var(--line);
  border-radius: var(--radius); padding: 12px;
  box-shadow: var(--shadow);
}
.sidebar__nav{display:flex; flex-direction:column; gap:6px}
.sidebar__nav a{
  display:flex; align-items:center; gap:8px;
  text-decoration:none; color:var(--ink);
  padding:8px 10px; border-radius:10px;
}
.sidebar__nav a:hover{background:var(--hover); color:var(--brand)}
.sidebar__nav a.active{background:rgba(75,156,255,.12); color:var(--brand); border:1px solid rgba(75,156,255,.25)}
.dot{
  width:10px; height:10px; border-radius:50%;
  background: radial-gradient(circle at 35% 35%, var(--brand), transparent);
  border:1px solid rgba(75,156,255,.5);
  box-shadow: 0 0 10px rgba(75,156,255,.35);
}

/* Content */
.content{min-width:0}

.card{
  background: var(--card);
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  margin: 14px 0;
  box-shadow: var(--shadow);
  position: relative;
  overflow:hidden;
}
.card--intro{
  border-left: 6px solid var(--brand);
}
.card--cta{
  border-left: 6px solid var(--brand-2);
  background: linear-gradient(180deg, rgba(25,179,107,.10), transparent 60%), var(--card);
}
.card__title{
  margin:0 0 8px; font-size: clamp(18px, 2.8vw, 26px);
  display:flex; align-items:center; gap:10px
}
.card__icon{
  width:38px; height:38px; display:grid; place-items:center;
  border-radius:12px; background: rgba(75,156,255,.12); color: var(--brand);
  border: 1px solid rgba(75,156,255,.25);
}

/* Lists */
.list{margin:8px 0 0}
.list--tick{list-style:none; padding-left:0}
.list--tick li{ padding-left:30px; position:relative; margin:10px 0 }
.list--tick li::before{
  content:""; position:absolute; left:0; top:7px; width:16px; height:16px; border-radius:50%;
  border:1px solid rgba(75,156,255,.5);
  background: radial-gradient(circle at 35% 35%, var(--brand), rgba(75,156,255,.2));
  box-shadow: 0 0 18px rgba(75,156,255,.25);
}
.list--dot{ padding-left:18px }

/* Chips */
.chips{
  display:flex; flex-wrap:wrap; gap:8px; padding:0; margin:8px 0 0; list-style:none
}
.chips li{
  padding:8px 12px; border-radius:999px;
  background:rgba(75,156,255,.12); border:1px solid rgba(75,156,255,.25)
}

/* Grid callouts */
.grid{display:grid; gap:12px; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); margin-top:8px}
.callout{
  background: linear-gradient(180deg, rgba(255,255,255,.04), transparent 70%);
  border:1px solid var(--line); border-radius:12px; padding:12px
}
.callout h3{margin:.2rem 0 .35rem; color:var(--brand)}

/* CTA */
.lead{color:var(--ink); opacity:.9; margin:.4rem 0 .7rem}
.cta__row{display:flex; gap:16px; align-items:stretch; flex-wrap:wrap}
.btn{
  display:inline-block; text-decoration:none; color:#fff;
  background: linear-gradient(135deg, var(--brand), #2a6bcf);
  padding:10px 14px; border-radius:12px; box-shadow: 0 12px 24px rgba(75,156,255,.25)
}
.btn:hover{ transform: translateY(-1px) }
.addr{
  background: var(--panel); border:1px solid var(--line); border-radius:12px;
  padding:10px 12px; min-width:240px
}

/* Footer */
.footer{display:flex; justify-content:flex-end; margin: 10px 0 0}
.backtop{
  text-decoration:none; color:var(--ink);
  background: var(--panel); border:1px solid var(--line);
  padding:8px 10px; border-radius:10px
}
.backtop:hover{ background: var(--hover); color: var(--brand)}

/* TTS pill */
.tts{
  position: fixed; right: 16px; bottom: 16px; z-index: 1000;
  background: var(--panel); border:1px solid var(--line);
  border-radius: 14px; box-shadow: var(--shadow);
  padding: 6px 8px; display:flex; align-items:center; gap:6px;
}
.tts__btn{
  background: transparent; border:1px solid var(--line); color:var(--ink);
  border-radius:10px; padding:6px 10px; cursor:pointer
}
.tts__btn:hover{ background: var(--hover); color: var(--brand) }
.tts__more summary{
  list-style:none; cursor:pointer; user-select:none;
  border:1px solid var(--line); border-radius:10px; padding:6px 10px; display:inline-block
}
.tts__more[open] summary{ color:var(--brand); background:var(--hover) }
.tts__tray{ margin-top:8px; display:flex; align-items:center; gap:10px }
.tts__field{ display:flex; align-items:center; gap:6px; font-size:.9rem }
.tts__field input[type="range"]{ width:110px }
.tts__field select{
  background: var(--card); color:var(--ink); border:1px solid var(--line);
  border-radius:8px; padding:4px 6px
}

/* Active link highlight as you scroll */
.sidebar__nav a.active .dot{
  background: radial-gradient(circle at 35% 35%, var(--brand-2), transparent);
  border-color: rgba(25,179,107,.6);
  box-shadow: 0 0 12px rgba(25,179,107,.4);
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto }
  .btn{ transform:none }
}