/* ==========================================================================
   Hexlab — design tokens
   Display: Space Grotesk / Body: Inter / Data: JetBrains Mono
========================================================================== */
:root{
  --bg: #0A0B0D;
  --surface: #14161A;
  --surface-2: #1B1E23;
  --border: #262A31;
  --text: #F2F1ED;
  --text-muted: #8B8F98;
  --text-faint: #565A63;

  --accent: #29E7CD;      /* default accent, overridden dynamically */
  --accent-soft: rgba(41, 231, 205, 0.14);
  --accent-2: #8B6BFF;    /* secondary, used in byte grid */

  --radius: 14px;
  --radius-sm: 8px;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --transition-glow: background 0.6s ease, box-shadow 0.6s ease;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.wrap{
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

a{ color: inherit; }

code{
  font-family: var(--font-mono);
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.mono{ font-family: var(--font-mono); }

/* ambient glow tied to the current hex color (signature element) */
.glow{
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 900px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 65%);
  filter: blur(40px);
  pointer-events: none;
  z-index: 0;
  transition: var(--transition-glow);
}

/* ==========================================================================
   Topbar
========================================================================== */
.topbar{
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10,11,13,0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height: 64px;
}
.brand{ display:flex; align-items:center; gap:8px; font-family: var(--font-display); font-weight:600; font-size: 1.15rem; }
.brand__mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--accent);
  color: #0A0B0D;
  font-family: var(--font-mono);
  font-weight: 700;
  transition: background 0.6s ease;
}
.topnav{ display:flex; gap: 28px; }
.topnav a{
  text-decoration:none;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s ease;
}
.topnav a:hover{ color: var(--text); }

/* ==========================================================================
   Ad slots — clearly labeled, reserve space to avoid layout shift
========================================================================== */
.ad-slot{
  position: relative;
  display:flex;
  align-items:center;
  justify-content:center;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-faint);
  font-size: 0.75rem;
  margin: 28px auto;
  overflow: hidden;
}
.ad-slot__label{
  position:absolute;
  top:6px;
  left:10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.65rem;
}
.ad-slot--leaderboard{ min-height: 90px; }
.ad-slot--rectangle{ min-height: 250px; max-width: 336px; }
.ad-slot--sidebar{ min-height: 600px; width: 100%; }

/* ==========================================================================
   Hero / converter
========================================================================== */
.hero{
  position: relative;
  z-index: 1;
  padding: 64px 0 24px;
}
.eyebrow{
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 14px;
  transition: color 0.6s ease;
}
.hero__title{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  max-width: 14ch;
}
.hero__sub{
  color: var(--text-muted);
  max-width: 52ch;
  font-size: 1.05rem;
  margin: 0 0 40px;
}

.tool{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.tool__label{
  display:block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}

.tool__inputwrap{
  display:flex;
  align-items:center;
  gap: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 4px 4px 16px;
  transition: border-color 0.2s ease;
}
.tool__inputwrap:focus-within{
  border-color: var(--accent);
}
.tool__prefix{
  font-family: var(--font-mono);
  color: var(--text-faint);
  font-size: 1.1rem;
}
.tool__input{
  flex:1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  padding: 14px 8px;
  min-width: 0;
}
.tool__input::placeholder{ color: var(--text-faint); }

.tool__clear, .copy{
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.75rem;
  font-family: var(--font-body);
  padding: 8px 12px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}
.tool__clear:hover, .copy:hover{ color: var(--text); border-color: var(--accent); }

.tool__hint{
  font-size: 0.82rem;
  color: var(--text-faint);
  margin: 12px 2px 0;
}
.hint-chip{
  font-family: var(--font-mono);
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
  font-size: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.6s ease;
}

/* ---- Hex Lens (signature element) ---- */
.lens{
  margin-top: 24px;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  align-items: stretch;
}
.lens__swatch{
  position: relative;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
  min-height: 96px;
  display:flex;
  align-items:flex-end;
}
.lens__swatchfill{
  position:absolute;
  inset:0;
  background: var(--surface-2);
  transition: background 0.25s ease;
}
.lens__swatchlabel{
  position: relative;
  z-index:1;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 6px 8px;
  color: rgba(0,0,0,0.65);
  background: rgba(255,255,255,0.55);
  border-top-right-radius: 6px;
  mix-blend-mode: normal;
}
.lens__bytes{
  display:flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
}
.byte{
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  min-width: 64px;
  font-family: var(--font-mono);
}
.byte__hex{ font-size: 0.95rem; color: var(--accent-2); display:block; }
.byte__dec{ font-size: 0.7rem; color: var(--text-faint); display:block; margin-top: 2px; }
.byte__char{ font-size: 0.7rem; color: var(--text-muted); display:block; }
.lens__empty{
  color: var(--text-faint);
  font-size: 0.85rem;
  font-family: var(--font-body);
  align-self: center;
}

/* ---- Results grid ---- */
.results{
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.result{
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.result__label{
  display:block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  margin-bottom: 8px;
}
.result__valuerow{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 10px;
}
.result__value{
  font-size: 0.95rem;
  word-break: break-all;
  color: var(--text);
}

/* ==========================================================================
   Reverse converter
========================================================================== */
.reverse{ padding: 56px 0; border-top: 1px solid var(--border); }
.reverse__grid{
  display:grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}
.section__title{
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin: 0 0 8px;
}
.section__sub{
  color: var(--text-muted);
  margin: 0 0 24px;
}
.tabs{ display:flex; gap: 8px; margin-bottom: 16px; }
.tab{
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-family: var(--font-body);
  cursor:pointer;
  transition: all 0.15s ease;
}
.tab.is-active{
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--text);
}

/* ==========================================================================
   Reference table
========================================================================== */
.reference{ padding: 56px 0; border-top: 1px solid var(--border); }
.reftable{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.reftable__cell{
  background: var(--surface);
  padding: 10px 14px;
  display:flex;
  justify-content: space-between;
  color: var(--text-muted);
}
.reftable__cell b{ color: var(--text); font-weight: 500; }

/* ==========================================================================
   FAQ
========================================================================== */
.faq{ padding: 56px 0; border-top: 1px solid var(--border); }
.faqlist{ display:flex; flex-direction: column; gap: 10px; }
.faqitem{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
}
.faqitem summary{
  cursor:pointer;
  font-weight: 500;
  list-style: none;
}
.faqitem summary::-webkit-details-marker{ display:none; }
.faqitem summary::before{
  content: '+';
  display:inline-block;
  width: 18px;
  color: var(--accent);
  transition: color 0.6s ease;
}
.faqitem[open] summary::before{ content: '–'; }
.faqitem p{ color: var(--text-muted); margin: 12px 0 0; line-height: 1.6; }

/* ==========================================================================
   Footer
========================================================================== */
.footer{ border-top: 1px solid var(--border); padding: 28px 0 48px; }
.footer__inner{
  display:flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-faint);
  flex-wrap: wrap;
  gap: 8px;
}

/* ==========================================================================
   Responsive
========================================================================== */
@media (max-width: 760px){
  .reverse__grid{ grid-template-columns: 1fr; }
  .results{ grid-template-columns: 1fr; }
  .lens{ grid-template-columns: 1fr; }
  .lens__swatch{ min-height: 64px; }
  .reftable{ grid-template-columns: repeat(2, 1fr); }
}

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

/* Visible keyboard focus */
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}