/* =========================
   TOWER RUSH — BLUE/YELLOW TECHNO THEME
   SEO-friendly, modern, readable
   ========================= */

:root{
  --bg: #070A12;
  --bg2:#0B1020;
  --card:#0E1630;

  --text:#EAF0FF;
  --muted:#A9B4D6;

  /* Tower Rush palette */
  --tr-blue:#39A9FF;
  --tr-blue2:#6ED3FF;
  --tr-yellow:#FFD43B;
  --tr-yellow2:#FFB800;

  --border: rgba(57,169,255,.20);
  --border2: rgba(255,212,59,.16);

  --shadow: 0 12px 40px rgba(0,0,0,.55);
  --radius: 18px;
  --radius2: 26px;

  --max: 1120px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  line-height:1.65;

  background:
    radial-gradient(1200px 800px at 18% 10%, rgba(57,169,255,.22), transparent 55%),
    radial-gradient(900px 650px at 85% 35%, rgba(255,212,59,.16), transparent 60%),
    radial-gradient(800px 600px at 50% 95%, rgba(110,211,255,.10), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
}

a{ color: var(--tr-blue2); text-decoration:none; }
a:hover{ text-decoration: underline; }

.content{
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px 18px 76px;
}

section{
  margin: 26px 0;
  padding: 22px 20px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(14,22,48,.90), rgba(11,16,32,.88));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: relative;
  overflow:hidden;
}

section:before{
  content:"";
  position:absolute;
  inset:-2px;
  background:
    radial-gradient(520px 240px at 18% 0%, rgba(57,169,255,.20), transparent 62%),
    radial-gradient(420px 220px at 90% 10%, rgba(255,212,59,.14), transparent 64%);
  opacity:.85;
  pointer-events:none;
}
section > *{ position:relative; z-index:1; }

h1,h2,h3{ line-height:1.15; margin:0 0 14px; }
h1{
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing:.2px;
}
h2{
  font-size: clamp(20px, 2.4vw, 28px);
  color:#F3F6FF;
}
p{ margin:0 0 12px; color: var(--text); }
.hero-subtitle,.muted{ color: var(--muted); }

ul,ol{ margin: 12px 0 0 20px; padding:0; }
li{ margin: 7px 0; }

/* HERO */
.hero{
  padding: 56px 18px 42px;
  border-bottom: 1px solid rgba(57,169,255,.22);
  background:
    radial-gradient(1100px 560px at 10% 10%, rgba(57,169,255,.24), transparent 60%),
    radial-gradient(900px 520px at 92% 30%, rgba(255,212,59,.16), transparent 58%),
    linear-gradient(180deg, rgba(7,10,18,.25), rgba(7,10,18,0));
  position: relative;
  overflow:hidden;
}
.hero:after{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: .22;
  pointer-events:none;
}
.hero-content{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 18px;
  position: relative;
  z-index: 2;
}
.hero-subtitle{
  font-size: 16px;
  max-width: 780px;
  margin: 12px 0 22px;
}

/* Buttons */
.btn-primary,
.btn-secondary{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding: 14px 18px;
  border-radius: 999px;
  font-weight: 900;
  letter-spacing: .2px;
  border: 1px solid transparent;
  cursor:pointer;
  transition: transform .18s ease, box-shadow .18s ease, filter .18s ease;
  text-decoration:none !important;
  user-select:none;
  white-space:nowrap;
}
.btn-primary{
  color:#07101E;
  background: linear-gradient(90deg, var(--tr-blue), var(--tr-yellow));
  box-shadow:
    0 10px 28px rgba(57,169,255,.20),
    0 10px 28px rgba(255,212,59,.14);
}
.btn-primary:hover{ transform: translateY(-1px); filter: brightness(1.06); }

.btn-secondary{
  color: var(--text);
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.14);
  box-shadow: 0 10px 26px rgba(0,0,0,.35);
}
.btn-secondary:hover{
  transform: translateY(-1px);
  border-color: rgba(57,169,255,.35);
  box-shadow: 0 14px 34px rgba(0,0,0,.45);
}

/* Feature list */
.feature-list{
  list-style:none;
  margin: 14px 0 0;
  padding:0;
  display:grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 10px 14px;
}
.feature-list li{
  margin:0;
  padding: 12px 12px;
  border: 1px solid rgba(57,169,255,.18);
  background: rgba(255,255,255,.04);
  border-radius: 14px;
}

/* FAQ preview */
.faq-preview .faq-item{
  margin: 12px 0;
  padding: 12px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.10);
}
.faq-preview .faq-item strong{
  display:block;
  margin:0 0 6px;
  color:#F6FAFF;
}
.faq-preview .faq-item p{
  margin:0;
  color: var(--muted);
}
.faq-link{
  display:inline-block;
  margin-top: 12px;
  font-weight: 900;
}

/* Final CTA */
.final-cta{
  border-radius: var(--radius2);
  border: 1px solid rgba(255,212,59,.22);
  background:
    radial-gradient(680px 240px at 18% 30%, rgba(57,169,255,.16), transparent 60%),
    radial-gradient(680px 240px at 85% 10%, rgba(255,212,59,.14), transparent 62%),
    linear-gradient(180deg, rgba(14,22,48,.92), rgba(11,16,32,.92));
}
.final-cta p{ color: var(--muted); }

/* Footer */
.footer{
  text-align:center;
  padding: 34px 16px 46px;
  color: rgba(234,240,255,.70);
  font-size: 13px;
}

/* Scroll buttons + sticky CTA */
#scrollTopBtn{
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 999;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  border: 1px solid rgba(57,169,255,.28);
  background: rgba(7,10,18,.55);
  color: rgba(234,240,255,.92);
  box-shadow: 0 14px 34px rgba(0,0,0,.45);
  cursor:pointer;
  opacity: 0;
  pointer-events:none;
  transform: translateY(10px);
  transition: opacity .22s ease, transform .22s ease, filter .22s ease;
}
#scrollTopBtn:hover{ filter: brightness(1.08); }
#scrollTopBtn.is-visible{
  opacity: 1;
  pointer-events:auto;
  transform: translateY(0);
}

.sticky-cta{
  position: fixed;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  bottom: 18px;
  z-index: 998;
  opacity: 0;
  pointer-events:none;
  transition: opacity .22s ease, transform .22s ease, filter .22s ease;
  width: min(520px, calc(100% - 28px));
}
.sticky-cta.is-visible{
  opacity: 1;
  pointer-events:auto;
  transform: translateX(-50%) translateY(0);
}
.sticky-cta a{
  width: 100%;
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 999px;
  font-weight: 950;
  letter-spacing:.2px;
  color:#07101E;
  background: linear-gradient(90deg, var(--tr-blue), var(--tr-yellow));
  box-shadow:
    0 16px 36px rgba(57,169,255,.18),
    0 16px 36px rgba(255,212,59,.14);
  text-decoration:none !important;
}
.sticky-cta a:hover{ filter: brightness(1.06); }

/* Mobile */
@media (max-width: 760px){
  .content{ padding: 26px 14px 74px; }
  section{ padding: 18px 14px; margin: 18px 0; }
  .feature-list{ grid-template-columns: 1fr; }
  .btn-primary, .btn-secondary{ width:100%; padding: 14px 16px; }
  .hero{ padding: 42px 12px 34px; }
  .hero-subtitle{ font-size: 15px; }
  #scrollTopBtn{ right: 12px; bottom: 12px; }
}

/* Focus */
:focus-visible{
  outline: 2px solid rgba(255,212,59,.85);
  outline-offset: 3px;
  border-radius: 10px;
}