/* =========================================================
   ByteDC — Landing Site Stylesheet
   Dark "data-center" aesthetic.
   Accent system: teal/emerald (primary) + amber (energy).
   ========================================================= */

:root {
  /* Base surfaces */
  --bg: #070a10;
  --bg-2: #0b0f17;
  --panel: #111824;
  --panel-2: #151d2c;
  --panel-3: #1a2436;
  --line: #222d40;
  --line-2: #2c3a52;

  /* Text */
  --text: #eef3fb;
  --muted: #91a0b6;
  --muted-2: #6a7890;

  /* Brand accents — teal/emerald + amber energy */
  --accent: #15c8a3;     /* primary teal-emerald */
  --accent-2: #4fe6c4;   /* lighter, for links/hover */
  --amber: #ffb13d;      /* warm energy accent */
  --good: #2bd17e;       /* positive / play */
  --warn: #ffc857;
  --bad: #ff6b6b;

  /* Gradients */
  --grad-brand: linear-gradient(110deg, #ffb13d 0%, #2bd17e 46%, #00c2b8 100%);
  --grad-accent: linear-gradient(135deg, #00c2b8 0%, #2bd17e 100%);

  /* Geometry */
  --maxw: 1140px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-pill: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 12px 30px -12px rgba(0,0,0,.6);
  --shadow-lg: 0 30px 60px -20px rgba(0,0,0,.7);
  --glow: 0 0 0 1px rgba(0,194,184,.25), 0 12px 40px -12px rgba(0,194,184,.5);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(900px 520px at 80% -8%, rgba(255,177,61,.10), transparent 60%),
    radial-gradient(1100px 640px at 10% -4%, rgba(0,194,184,.18), transparent 55%),
    var(--bg);
  font: 16px/1.65 "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  letter-spacing: .1px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Subtle grid texture overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(1000px 700px at 50% -5%, #000 0%, transparent 72%);
}

body > * { position: relative; z-index: 1; }

a { color: var(--accent-2); text-decoration: none; transition: color .15s ease; }
a:hover { color: #fff; }

h1, h2, h3 { letter-spacing: -.02em; line-height: 1.12; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.muted { color: var(--muted); }

/* Animated brand gradient text */
.grad {
  background: var(--grad-brand);
  background-size: 220% 220%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradshift 9s ease-in-out infinite;
}
@keyframes gradshift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

/* ---------------------------------------------------------
   Buttons
   --------------------------------------------------------- */
.btn {
  --bg-btn: var(--grad-accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-btn);
  color: #042018;
  padding: 11px 20px;
  border-radius: var(--r-sm);
  font-weight: 700;
  font-size: 15px;
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 22px -10px rgba(0,194,184,.7);
  transition: transform .15s ease, box-shadow .15s ease, filter .15s ease;
}
.btn:hover { color: #042018; transform: translateY(-2px); box-shadow: 0 14px 30px -10px rgba(0,194,184,.85); }
.btn:active { transform: translateY(0); }
.btn.good {
  --bg-btn: linear-gradient(135deg, var(--good), #1fb567);
  color: #042018;
  box-shadow: 0 8px 22px -10px rgba(43,209,126,.75);
}
.btn.good:hover { color: #042018; box-shadow: 0 14px 30px -10px rgba(43,209,126,.9); }
.btn.ghost {
  background: rgba(255,255,255,.03);
  border: 1px solid var(--line-2);
  color: var(--text);
  box-shadow: none;
  backdrop-filter: blur(6px);
}
.btn.ghost:hover { background: rgba(255,255,255,.06); border-color: var(--accent); color: #fff; }

/* ---------------------------------------------------------
   Pre-Alpha warning banner
   --------------------------------------------------------- */
.alpha-banner {
  background:
    linear-gradient(180deg, rgba(255,177,61,.14), rgba(255,177,61,.06));
  border-bottom: 1px solid rgba(255,177,61,.35);
  color: #ffe6ad;
}
.alpha-banner .wrap {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 22px; font-size: 14px; line-height: 1.5;
}
.alpha-banner .pill {
  flex: none;
  background: var(--warn); color: #2a1d00;
  font-weight: 800; font-size: 11px; letter-spacing: .6px; text-transform: uppercase;
  padding: 4px 10px; border-radius: var(--r-pill);
}
.alpha-banner b { color: #fff; }
@media (max-width: 620px) {
  .alpha-banner .wrap { align-items: flex-start; }
}

/* ---------------------------------------------------------
   Navigation
   --------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7,10,16,.72);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; font-size: 19px; color: var(--text); }
.brand:hover { color: var(--text); }
.brand .tag {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .4px;
  text-transform: uppercase;
  color: var(--accent-2);
  background: rgba(21,200,163,.1);
  border: 1px solid rgba(21,200,163,.28);
  padding: 3px 9px;
  border-radius: var(--r-pill);
  vertical-align: middle;
}
.navlinks { display: flex; align-items: center; gap: 26px; }
.navlinks a { color: var(--muted); font-weight: 550; font-size: 15px; }
.navlinks a:hover { color: var(--text); }
.navlinks a.btn { color: #042018; }
.navtoggle {
  display: none; background: rgba(255,255,255,.04); border: 1px solid var(--line-2);
  color: var(--text); border-radius: var(--r-sm); padding: 7px 11px; font-size: 18px; cursor: pointer;
}

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
.hero { padding: 96px 0 64px; text-align: center; position: relative; }
.hero::after {
  content: "";
  position: absolute; left: 50%; top: 8%; transform: translateX(-50%);
  width: min(680px, 80%); height: 320px; z-index: -1;
  background: radial-gradient(closest-side, rgba(0,194,184,.20), transparent 70%);
  filter: blur(20px);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--accent-2); font-weight: 600; letter-spacing: .4px;
  text-transform: uppercase; font-size: 12.5px;
  background: rgba(21,200,163,.08);
  border: 1px solid rgba(21,200,163,.24);
  padding: 6px 14px; border-radius: var(--r-pill);
}
.eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--good); box-shadow: 0 0 0 4px rgba(43,209,126,.18);
}
.hero h1 { font-size: clamp(36px, 6.4vw, 64px); margin: 22px 0 18px; font-weight: 800; }
.hero p.lead { font-size: clamp(17px, 2vw, 20px); color: var(--muted); max-width: 660px; margin: 0 auto 32px; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------------------------------------------------------
   Stats band
   --------------------------------------------------------- */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
  margin-top: 56px;
}
.stat {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px 16px;
  text-align: center;
}
.stat .num { font-size: 28px; font-weight: 800; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .lbl { color: var(--muted); font-size: 13.5px; margin-top: 4px; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* ---------------------------------------------------------
   Sections
   --------------------------------------------------------- */
section.block { padding: 72px 0; border-top: 1px solid var(--line); }
section.block .sec-head { max-width: 720px; }
section.block h2 { font-size: clamp(24px, 3.4vw, 33px); margin: 0 0 10px; font-weight: 800; }
section.block .sub { color: var(--muted); margin: 0 0 36px; font-size: 17px; }

/* ---------------------------------------------------------
   Feature grid
   --------------------------------------------------------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid { grid-template-columns: 1fr; } }

.card {
  position: relative;
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px 24px;
  overflow: hidden;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,177,61,.55), transparent);
  opacity: 0; transition: opacity .2s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--line-2); box-shadow: var(--shadow-md); }
.card:hover::before { opacity: 1; }
.card .ico {
  display: inline-grid; place-items: center;
  width: 52px; height: 52px;
  font-size: 26px;
  border-radius: 13px;
  background: radial-gradient(120% 120% at 30% 20%, rgba(0,194,184,.24), rgba(43,209,126,.12));
  border: 1px solid rgba(21,200,163,.28);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06);
  margin-bottom: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 18.5px; font-weight: 700; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------------------------------------------------------
   Steps
   --------------------------------------------------------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; position: relative; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.step {
  position: relative;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 24px 22px;
}
.step .n {
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--grad-accent); color: #042018;
  display: grid; place-items: center; font-weight: 800; font-size: 18px;
  margin-bottom: 14px;
  box-shadow: 0 8px 20px -8px rgba(0,194,184,.7);
}
.step h3 { margin: 0 0 6px; font-size: 18px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------------------------------------------------------
   Highlight / real-time panel
   --------------------------------------------------------- */
.panel {
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255,177,61,.12), transparent 55%),
    linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 40px;
}
.panel h2 { margin-top: 0; }
.panel .sub { margin-bottom: 0; max-width: 760px; }

/* ---------------------------------------------------------
   Closing CTA band
   --------------------------------------------------------- */
.cta-band { padding: 80px 0; border-top: 1px solid var(--line); }
.cta-band .inner {
  position: relative;
  text-align: center;
  background:
    radial-gradient(120% 160% at 50% 0%, rgba(0,194,184,.18), transparent 60%),
    linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  padding: 56px 28px;
  overflow: hidden;
}
.cta-band h2 { font-size: clamp(26px, 4vw, 38px); margin: 0 0 12px; font-weight: 800; }
.cta-band p { color: var(--muted); font-size: 18px; margin: 0 auto 28px; max-width: 560px; }

/* ---------------------------------------------------------
   Article (guide / about / legal)
   --------------------------------------------------------- */
.article { padding: 64px 0 80px; }
.article > .wrap { max-width: 860px; }
.article h1 { font-size: clamp(30px, 5vw, 42px); margin: 0 0 8px; font-weight: 800; }
.article > .wrap > p.intro { color: var(--muted); font-size: 18px; margin-top: 0; margin-bottom: 8px; }
.article h2 {
  font-size: 23px; margin: 44px 0 12px; padding-top: 28px;
  border-top: 1px solid var(--line); font-weight: 750;
}
.article h3 { font-size: 17.5px; margin: 24px 0 6px; }
.article p, .article li { color: #c8d2e6; }
.article ul { padding-left: 22px; }
.article li { margin: 5px 0; }
.article li::marker { color: var(--accent); }

.article table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  margin: 18px 0; font-size: 15px;
  border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden;
}
.article th, .article td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--line); }
.article tr:last-child td { border-bottom: none; }
.article th { background: var(--panel-2); font-weight: 650; color: var(--text); }
.article td { color: #c8d2e6; }

.toc {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 20px 24px; margin: 22px 0 8px;
}
.toc b { font-size: 13px; text-transform: uppercase; letter-spacing: .6px; color: var(--muted); }
.toc ul { margin: 12px 0 0; columns: 2; column-gap: 28px; padding-left: 18px; }
@media (max-width: 620px) { .toc ul { columns: 1; } }
.toc a { color: var(--accent-2); }

.note {
  background: rgba(0,194,184,.08); border: 1px solid rgba(0,194,184,.4);
  border-left-width: 4px; border-radius: var(--r-sm);
  padding: 14px 18px; color: #cdf3ec; font-size: 14.5px; margin: 18px 0;
}
.warnbox {
  background: rgba(255,200,87,.08); border: 1px solid rgba(255,200,87,.45);
  border-left-width: 4px; border-radius: var(--r-sm);
  padding: 14px 18px; color: #ffe6ad; font-size: 14.5px; margin: 0 0 24px;
}

/* ---------------------------------------------------------
   FAQ
   --------------------------------------------------------- */
.faq details {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 2px 20px; margin-bottom: 12px;
  transition: border-color .2s ease;
}
.faq details[open] { border-color: var(--line-2); }
.faq summary {
  cursor: pointer; font-weight: 650; padding: 16px 0; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; color: var(--accent-2); font-weight: 800; font-size: 20px;
  transition: transform .2s ease; line-height: 1;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 16px; color: var(--muted); }

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
footer { border-top: 1px solid var(--line); padding: 52px 0 36px; color: var(--muted); font-size: 14.5px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 28px; }
footer .ftbrand { max-width: 320px; }
footer .ftbrand .brand { font-size: 18px; margin-bottom: 10px; }
footer .ftbrand p { margin: 0; color: var(--muted-2); font-size: 14px; line-height: 1.6; }
footer .flinks { display: flex; gap: 44px; flex-wrap: wrap; }
footer .flinks .col { display: flex; flex-direction: column; gap: 10px; }
footer .flinks .col b { color: var(--text); font-size: 13px; text-transform: uppercase; letter-spacing: .5px; font-weight: 650; }
footer .flinks a { color: var(--muted); }
footer .flinks a:hover { color: var(--text); }
footer .ftbottom {
  max-width: var(--maxw); margin: 32px auto 0; padding: 22px 22px 0;
  border-top: 1px solid var(--line); color: var(--muted-2); font-size: 13.5px;
}

/* ---------------------------------------------------------
   Mobile nav
   --------------------------------------------------------- */
@media (max-width: 760px) {
  .navlinks {
    position: absolute; top: 66px; left: 0; right: 0;
    background: rgba(11,15,23,.97); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; gap: 0; padding: 8px 0; display: none;
  }
  .navlinks.open { display: flex; }
  .navlinks a { padding: 13px 22px; }
  .navlinks .btn { margin: 10px 22px; justify-content: center; }
  .navtoggle { display: inline-block; }
  .hero { padding: 64px 0 48px; }
  section.block { padding: 56px 0; }
  .panel { padding: 28px 22px; }
  footer .wrap { flex-direction: column; gap: 24px; }
}

/* ---------------------------------------------------------
   Motion preferences
   --------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}