/* reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }
input, textarea, select { font: inherit; color: inherit; }

/* tokens */
:root {
  /* surfaces */
  --bg: #0D0D1A;
  --bg-2: #16162E;
  --bg-3: #1F1F40;
  --panel: #1A1A33;
  --ink: #05050C;
  --text: #F1F5F9;
  --muted: #9B9BC4;
  --line: #2C2C52;

  /* accents */
  --magenta: #FF3D8B;
  --violet: #8B5CF6;
  --cyan: #22D3EE;
  --lime: #B4FF39;
  --gold: #FFCC33;

  /* type */
  --font-display: "Syne", "Trebuchet MS", system-ui, sans-serif;
  --font-body: "Onest", system-ui, -apple-system, sans-serif;

  /* spacing scale */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;

  /* radius */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-pill: 999px;

  /* lines + shadows (comic ink) */
  --bw: 3px;
  --shadow-hard: 7px 7px 0 var(--ink);
  --shadow-hard-sm: 4px 4px 0 var(--ink);
  --shadow-glow: 0 0 24px rgba(139, 92, 246, 0.35);

  /* motion */
  --t-fast: 0.15s ease;
  --t-med: 0.28s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* z-index */
  --z-header: 100;
  --z-menu: 110;
  --z-cookie: 120;
  --z-top: 90;

  /* layout */
  --header-h: 72px;
  --container: 1200px;

  /* logo */
  --logo-w: 188px;
  --logo-h: 44px;

  /* halftone dot pattern */
  --halftone: radial-gradient(circle at center, rgba(255,255,255,0.10) 1.4px, transparent 1.6px);
}

/* base */
body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
  overflow-x: hidden;
  background-image:
    radial-gradient(circle at 12% -10%, rgba(139,92,246,0.16), transparent 45%),
    radial-gradient(circle at 88% 8%, rgba(34,211,238,0.12), transparent 42%);
  background-attachment: fixed;
}
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.05; letter-spacing: -0.02em; font-weight: 800; }
h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.9rem); }
h3 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); }
p { color: var(--text); }
strong { color: #fff; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; border-radius: 3px; }

/* layout */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--s-5); }
main { padding-top: var(--header-h); display: block; }
.ba4xq-section { padding-block: var(--s-9); }
.ba4xq-section-tight { padding-block: var(--s-7); }
.ba4xq-eyebrow {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-family: var(--font-display); font-weight: 700; font-size: 0.82rem;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--bg);
  background: var(--lime); padding: 5px 12px; border: var(--bw) solid var(--ink);
  border-radius: var(--r-pill); box-shadow: var(--shadow-hard-sm); margin-bottom: var(--s-4);
}
.ba4xq-lead { font-size: 1.18rem; color: var(--muted); max-width: 62ch; }

/* header */
#site-header {
  position: fixed; top: 0; left: 0; right: 0; height: var(--header-h);
  z-index: var(--z-header); overflow: hidden;
  background: rgba(13, 13, 26, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: var(--bw) solid var(--ink);
}
#site-header .nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h); gap: var(--s-4); overflow: hidden;
}
.ba4xq-logo { display: flex; align-items: center; flex-shrink: 0; }
.ba4xq-logo img { width: var(--logo-w); height: auto; max-height: var(--logo-h); display: block; }
.nav-links { display: flex; align-items: center; gap: var(--s-5); }
.nav-links a {
  font-family: var(--font-display); font-weight: 600; font-size: 0.98rem;
  color: var(--text); position: relative; padding: 4px 0; transition: color var(--t-fast);
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -3px; height: 3px;
  background: var(--magenta); transform: scaleX(0); transform-origin: left; transition: transform var(--t-fast);
}
.nav-links a:hover, .nav-links a:focus-visible { color: var(--cyan); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-links a.active { color: var(--cyan); }
.nav-actions { display: flex; align-items: center; gap: var(--s-3); flex-shrink: 0; }

.hamburger {
  display: none; flex-direction: column; gap: 5px; width: 44px; height: 44px;
  align-items: center; justify-content: center; border: var(--bw) solid var(--ink);
  border-radius: var(--r-sm); background: var(--magenta);
}
.hamburger span { display: block; width: 22px; height: 3px; background: var(--ink); border-radius: 2px; transition: transform var(--t-fast), opacity var(--t-fast); }
.hamburger.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* mobile menu */
.mobile-menu {
  position: fixed; top: var(--header-h); left: 0; right: 0; z-index: var(--z-menu);
  background: var(--bg-2); border-bottom: var(--bw) solid var(--ink);
  display: block; padding: var(--s-4) 0 var(--s-6);
  transform: translateY(-130%); transition: transform var(--t-med); max-height: calc(100vh - var(--header-h)); overflow-y: auto;
}
.mobile-menu.open { transform: translateY(0); }
.mobile-menu a {
  font-family: var(--font-display); font-weight: 700; font-size: 1.25rem;
  padding: var(--s-3) 0; border-bottom: 2px dashed var(--line);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu .ba4xq-btn { margin-top: var(--s-4); text-align: center; }

/* footer */
.ba4xq-footer {
  background: var(--bg-2); border-top: var(--bw) solid var(--ink);
  padding-block: var(--s-8) var(--s-6); margin-top: var(--s-9);
  background-image: var(--halftone); background-size: 18px 18px;
}
.ba4xq-footer-grid { display: flex; flex-wrap: wrap; gap: var(--s-8); justify-content: space-between; align-items: flex-start; }
.ba4xq-footer-brand { flex: 1 1 360px; max-width: 480px; }
.ba4xq-footer-slogan { font-family: var(--font-display); font-size: clamp(1.8rem, 3.4vw, 2.6rem); font-weight: 800; line-height: 1.02; margin: var(--s-4) 0; }
.ba4xq-footer-slogan em { font-style: normal; color: var(--magenta); }
.ba4xq-footer-cols { display: flex; flex-wrap: wrap; gap: var(--s-8); }
.ba4xq-footer-col h4 { font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--cyan); margin-bottom: var(--s-3); }
.ba4xq-footer-col li { margin-bottom: var(--s-2); }
.ba4xq-footer-col a { color: var(--muted); transition: color var(--t-fast); font-weight: 500; }
.ba4xq-footer-col a:hover { color: var(--text); }
.ba4xq-footer-bottom { margin-top: var(--s-7); padding-top: var(--s-5); border-top: 2px solid var(--line); display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: space-between; color: var(--muted); font-size: 0.9rem; }
.ba4xq-footer-bottom .ba4xq-footer-brand .ba4xq-logo img { width: calc(var(--logo-w) * 0.9); height: auto; display: block; }

/* cookie */
#cookie-banner {
  position: fixed; left: var(--s-4); right: var(--s-4); bottom: var(--s-4); z-index: var(--z-cookie);
  max-width: 560px; margin-inline: auto;
  background: var(--panel); border: var(--bw) solid var(--ink); border-radius: var(--r-md);
  box-shadow: var(--shadow-hard); padding: var(--s-5);
  transform: translateY(160%); transition: transform var(--t-med);
}
#cookie-banner.show { transform: translateY(0); }
#cookie-banner p { font-size: 0.94rem; color: var(--muted); margin-bottom: var(--s-4); }
#cookie-banner a { color: var(--cyan); text-decoration: underline; }
.ba4xq-cookie-actions { display: flex; flex-wrap: wrap; gap: var(--s-3); }

/* back to top */
#back-to-top {
  position: fixed; right: var(--s-5); bottom: var(--s-5); z-index: var(--z-top);
  width: 50px; height: 50px; border-radius: var(--r-sm); background: var(--cyan);
  border: var(--bw) solid var(--ink); box-shadow: var(--shadow-hard-sm);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(12px); transition: opacity var(--t-fast), transform var(--t-fast);
}
#back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
#back-to-top svg { width: 22px; height: 22px; }
#back-to-top:hover { background: var(--lime); }

/* reading progress */
#reading-progress {
  position: fixed; top: 0; left: 0; height: 4px; width: 0%;
  background: linear-gradient(90deg, var(--magenta), var(--cyan), var(--lime));
  z-index: var(--z-cookie); transition: width 0.08s linear;
}

/* animations */
.ba4xq-reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1); }
.ba4xq-reveal.in { opacity: 1; transform: none; }
@keyframes ba4xq-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }
@keyframes ba4xq-spin { to { transform: rotate(360deg); } }
@keyframes ba4xq-pop { 0% { transform: scale(0.6); opacity: 0; } 70% { transform: scale(1.08); } 100% { transform: scale(1); opacity: 1; } }

/* responsive */
@media (min-width: 1101px) {
  .nav-links { display: flex; }
  .nav-actions { display: flex; }
  .hamburger { display: none; }
}
@media (max-width: 1100px) and (min-width: 781px) {
  .nav-actions { display: none; }
}
@media (max-width: 1100px) {
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .hamburger { display: flex; }
}
@media (max-width: 780px) {
  :root { --header-h: 64px; --logo-w: 158px; }
  .ba4xq-section { padding-block: var(--s-8); }
  .ba4xq-footer-grid { gap: var(--s-6); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
  .ba4xq-reveal { opacity: 1; transform: none; }
}