/* =============================================================
   AdBorder — Shared Styles
   Design System v2 · July 2026
   
   Fonts: Bricolage Grotesque (display) · Atkinson Hyperlegible (body) · Source Serif 4 (article serif)
   Colors: Teal (#0d9488) + Amber (#d97706) on Deep Navy (#0b1120)
   ============================================================= */

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== Design Tokens ===== */
:root {
  --bg: #0b1120;
  --bg2: #111827;
  --surface: #151f30;
  --surface-hover: #1c2940;
  --surface-border: #263348;
  --surface-border-hover: #3b4f6e;

  --text: #e8ecf4;
  --text2: #94a3b8;
  --text3: #64748b;

  --accent: #0d9488;
  --accent-hover: #14b8a6;
  --accent-light: #99f6e4;
  --accent2: #d97706;
  --accent2-hover: #f59e0b;

  --gradient-brand: linear-gradient(135deg, #0d9488, #d97706);
  --gradient-brand-text: linear-gradient(135deg, #5eead4, #fbbf24);
  --gradient-text: linear-gradient(135deg, #5eead4, #fbbf24);

  --radius: 12px;
  --radius-sm: 8px;

  --font-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --font-body: 'Atkinson Hyperlegible', system-ui, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, serif;

  --header-height: 56px;
  --content-max: 800px;
  --tool-max: 1200px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ===== Subtle Background ===== */
.mesh-bg {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(ellipse 80% 50% at 20% 20%, rgba(13,148,136,0.06), transparent),
    radial-gradient(ellipse 60% 40% at 80% 10%, rgba(217,119,6,0.03), transparent),
    radial-gradient(ellipse 70% 50% at 90% 90%, rgba(13,148,136,0.04), transparent);
}

.noise {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat; background-size: 200px;
}

/* ===== Skip Link (a11y) ===== */
.skip-link {
  position: absolute; top: -50px; left: 0; z-index: 10001;
  background: var(--accent); color: white; padding: 10px 20px;
  font-size: 0.85rem; font-weight: 600; text-decoration: none;
  border-radius: 0 0 var(--radius-sm) 0; transition: top 0.25s ease;
}
.skip-link:focus { top: 0; }

/* ===== Header ===== */
header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,17,32,0.88);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--surface-border);
}
.header-inner {
  max-width: var(--content-max); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-height);
}
.logo {
  font-family: var(--font-display); font-size: 1.4rem; font-weight: 800;
  text-decoration: none; letter-spacing: -0.5px;
  background: var(--gradient-brand-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ===== Navigation ===== */
nav { display: flex; gap: 4px; }
nav a {
  color: var(--text2); text-decoration: none; font-size: 0.85rem; font-weight: 500;
  padding: 8px 14px; border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
  min-height: 44px; display: inline-flex; align-items: center;
}
nav a:hover { color: var(--text); background: var(--surface-hover); }
nav a.active { color: var(--text); background: var(--surface); }

/* ===== Main Content ===== */
main { max-width: var(--content-max); margin: 0 auto; padding: 48px 24px; }

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-display); color: var(--text); text-wrap: balance; }
h1 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); font-weight: 800; margin-bottom: 16px; letter-spacing: -0.02em; line-height: 1.2; }
h2 { font-size: 1.3rem; font-weight: 700; margin-top: 32px; margin-bottom: 12px; }
h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
p { color: var(--text2); margin-bottom: 12px; }
strong { color: var(--text); font-weight: 600; }
a { color: var(--accent-light); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--surface-border);
  padding: 32px 24px; margin-top: 48px; text-align: center;
}
footer nav { display: block; }
.footer-links {
  display: flex; gap: 20px; justify-content: center;
  margin-bottom: 12px; flex-wrap: wrap;
}
.footer-links a { color: var(--text2); text-decoration: none; font-size: 0.82rem; }
.footer-links a:hover { color: var(--accent); }
.footer-copy { font-size: 0.82rem; color: var(--text3); }
.footer-support {
  margin-top: 20px; padding-top: 20px;
  border-top: 1px solid var(--surface-border);
  display: flex; align-items: center; justify-content: center;
  gap: 16px; flex-wrap: wrap;
}
.footer-support-text { color: var(--text2); font-size: 0.82rem; margin: 0; }
.footer-support-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 20px;
  background: linear-gradient(135deg, rgba(13,148,136,0.15), rgba(217,119,6,0.10));
  border: 1px solid rgba(13,148,136,0.25);
  color: var(--accent-light); text-decoration: none;
  font-family: var(--font-display); font-size: 0.8rem; font-weight: 600;
  transition: all 0.3s ease;
}
.footer-support-btn:hover {
  background: linear-gradient(135deg, rgba(13,148,136,0.25), rgba(217,119,6,0.15));
  border-color: rgba(13,148,136,0.4);
}

/* ===== Selection & Focus ===== */
::selection { background: rgba(13,148,136,0.3); color: white; }
*:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }

/* ===== Scroll Reveal ===== */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Cookie Banner ===== */
.cookie-banner {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: rgba(11,17,32,0.95);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  color: var(--text); padding: 14px 24px; z-index: 9999;
  font-size: 0.85rem; display: none;
  align-items: center; justify-content: center; gap: 14px;
  flex-wrap: wrap; border-top: 1px solid var(--surface-border);
}
.cookie-banner a { color: var(--accent-light); text-decoration: underline; }
.cookie-accept {
  background: var(--accent); color: white; border: none;
  padding: 8px 20px; border-radius: var(--radius-sm);
  cursor: pointer; font-weight: 600; font-size: 0.82rem;
  font-family: var(--font-body);
}
.cookie-accept:hover { background: var(--accent-hover); }

/* ===== Ad Slots ===== */
.ad-slot { max-width: var(--content-max); margin: 32px auto; padding: 0 24px; }
.ad-slot-inner {
  width: 100%; min-height: 90px;
  background: var(--surface); border: 1px dashed var(--surface-border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text3); font-size: 0.75rem;
}

/* ===== Ko-fi Floating Support Button ===== */
.kofi-float {
  position: fixed; bottom: 24px; right: 24px; z-index: 999;
  display: flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 50px;
  background: var(--gradient-brand);
  color: white; text-decoration: none; font-family: var(--font-display);
  font-size: 0.82rem; font-weight: 700;
  box-shadow: 0 4px 20px rgba(13,148,136,0.4), 0 2px 8px rgba(0,0,0,0.3);
  transition: all 0.3s ease; cursor: pointer;
}
.kofi-float:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(13,148,136,0.55), 0 4px 12px rgba(0,0,0,0.3);
}
.kofi-float-icon { font-size: 1.2rem; line-height: 1; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .header-inner { padding: 0 16px; }
  main { padding: 32px 16px; }
  .footer-links { gap: 12px; }
}

@media (max-width: 600px) {
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.15rem; }
  nav { gap: 2px; }
  nav a { padding: 8px 10px; font-size: 0.8rem; }
}

@media (max-width: 400px) {
  .header-inner { flex-direction: column; height: auto; padding: 10px 16px; gap: 6px; }
  nav { width: 100%; justify-content: center; }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .mesh-bg { display: none; }
  .reveal { opacity: 1; transform: none; }
}