/* ============================================================
   handbyte — landing page
   Design system: Dark OLED · JetBrains Mono + Inter · accent #22c55e
   ============================================================ */

:root {
  /* Surfaces */
  --bg:        #0a0d12;
  --bg-1:      #0e131b;
  --bg-2:      #131923;
  --bg-3:      #182030;
  --line:      #1c2433;
  --line-2:    #2a3344;

  /* Foreground */
  --fg:        #f1f5f9;
  --fg-mute:   #94a3b8;
  --fg-dim:    #64748b;
  --fg-faint:  #475569;

  /* Accent (terminal green, primary CTA color) */
  --acc:       #22c55e;
  --acc-1:     #16a34a;
  --acc-glow:  rgba(34, 197, 94, 0.16);

  /* Secondary accents */
  --warn:      #f59e0b;
  --danger:    #ef4444;
  --info:      #60a5fa;

  /* Type */
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --font-sans: 'Inter', ui-sans-serif, -apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui, sans-serif;

  /* Geometry */
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;

  --shadow:    0 10px 30px rgba(0,0,0,0.4);
  --shadow-lg: 0 30px 80px rgba(0,0,0,0.55), 0 8px 24px rgba(0,0,0,0.35);

  --max:       1240px;
  --gutter:    32px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { list-style: none; }
code, kbd, pre, samp { font-family: var(--font-mono); }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- a11y ---------- */
.skip-link {
  position: fixed; left: -9999px;
  background: var(--acc); color: #001; padding: 8px 14px; border-radius: 6px;
  font-weight: 600;
}
.skip-link:focus { left: 16px; top: 16px; z-index: 1000; }

/* ---------- background fx ---------- */
.bg { position: fixed; inset: 0; pointer-events: none; z-index: -1; overflow: hidden; }
.bg__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, #000 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, #000 30%, transparent 70%);
}
.bg__glow {
  position: absolute;
  width: 720px; height: 720px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.55;
}
.bg__glow--a { background: rgba(34,197,94,0.18); top: -200px; right: -120px; }
.bg__glow--b { background: rgba(96,165,250,0.10); top: 280px; left: -240px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  background: rgba(10, 13, 18, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { display: inline-flex; align-items: center; gap: 12px; }
.logo__mark {
  flex-shrink: 0;
  filter: drop-shadow(0 4px 12px rgba(34,197,94,0.18));
  overflow: visible;
}
.logo__dots circle { opacity: 0.25; transition: opacity 0.3s; }
.logo__sweep {
  filter: drop-shadow(0 0 6px var(--acc));
  animation: sweep 3.6s ease-in-out infinite;
}
.logo:hover .logo__dots circle { animation: dotPulse 1.4s ease-in-out infinite; }
.logo:hover .logo__dots circle:nth-child(1) { animation-delay: 0s; }
.logo:hover .logo__dots circle:nth-child(2) { animation-delay: 0.08s; }
.logo:hover .logo__dots circle:nth-child(3) { animation-delay: 0.16s; }
.logo:hover .logo__dots circle:nth-child(4) { animation-delay: 0.24s; }
.logo:hover .logo__dots circle:nth-child(5) { animation-delay: 0.32s; }
.logo:hover .logo__dots circle:nth-child(6) { animation-delay: 0.40s; }
.logo:hover .logo__dots circle:nth-child(7) { animation-delay: 0.48s; }
.logo:hover .logo__dots circle:nth-child(8) { animation-delay: 0.56s; }

@keyframes sweep {
  0%, 100% { transform: translateX(0); }
  45%, 55% { transform: translateX(42px); }
}
@keyframes dotPulse {
  0%, 100% { opacity: 0.25; transform: scale(1); }
  50%      { opacity: 1;    transform: scale(1.15); }
}

.logo__word {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.logo__word--sm { font-size: 14px; }

.ghbtn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  font-size: 13.5px; font-weight: 500;
  color: var(--fg);
  background: rgba(255,255,255,0.02);
  transition: all 0.18s;
}
.ghbtn:hover { border-color: var(--acc); color: var(--acc); background: rgba(34,197,94,0.06); }

/* ---------- layout helpers ---------- */
.section__inner, .hero__inner, .stats__inner, .cta__inner, .foot__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section__inner--narrow { max-width: 980px; }

/* ---------- hero ---------- */
.hero { padding: 84px 0 64px; position: relative; }
.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 56px;
  align-items: center;
}
.hero__copy { min-width: 0; }

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  margin-bottom: 24px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-mute);
  background: rgba(255,255,255,0.02);
}
.kicker__dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--acc);
  box-shadow: 0 0 10px var(--acc);
  animation: blink 2s ease-in-out infinite;
}

.h1 {
  font-size: clamp(38px, 5.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: 0 0 22px;
}
.h1__accent {
  background: linear-gradient(120deg, var(--acc) 0%, #4ade80 50%, var(--acc) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% auto;
  animation: shimmer 6s linear infinite;
}
@keyframes shimmer { to { background-position: 200% center; } }

.lede {
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg-mute);
  max-width: 56ch;
  margin: 0 0 28px;
}
.lede code {
  color: var(--acc);
  font-size: 0.95em;
  font-weight: 500;
}

/* install command "button" */
.cmd {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  padding: 14px 14px 14px 18px;
  background: var(--bg-1);
  border: 1px solid var(--line-2);
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--fg);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255,255,255,0.02);
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
  cursor: pointer;
  min-width: 0;
}
.cmd:hover { border-color: var(--acc); background: var(--bg-2); }
.cmd:active { transform: scale(0.997); }
.cmd--center { margin: 8px auto 0; max-width: 720px; }

.cmd__prompt { color: var(--acc); font-weight: 600; flex-shrink: 0; }
.cmd__text {
  flex: 1; min-width: 0;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}
.cmd__text::-webkit-scrollbar { display: none; }

.cmd__copy {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border-radius: 6px;
  color: var(--fg-mute);
  background: var(--bg-3);
  transition: color 0.15s, background 0.15s;
}
.cmd:hover .cmd__copy { color: var(--fg); }
.cmd .i-check { display: none; }
.cmd.is-copied .cmd__copy { background: var(--acc); color: #001; }
.cmd.is-copied .i-copy  { display: none; }
.cmd.is-copied .i-check { display: block; }

.install__meta {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--fg-dim);
  font-family: var(--font-mono);
}
.install__meta code {
  color: var(--acc);
}
.install__meta a {
  color: var(--fg-mute);
  border-bottom: 1px dashed var(--line-2);
  transition: color 0.15s, border-color 0.15s;
}
.install__meta a:hover { color: var(--acc); border-color: var(--acc); }

.bullets {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, max-content);
  gap: 10px 22px;
  font-size: 14px;
  color: var(--fg-mute);
}
.bullets li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.bullets svg { color: var(--acc); }

/* ---------- terminal mockup ---------- */
.terminal {
  background: linear-gradient(180deg, #0d131c, #0a0e15);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  min-width: 0;
}
.terminal::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, rgba(34,197,94,0.4), transparent 40%, rgba(96,165,250,0.18));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
  opacity: 0.45;
}
.terminal__bar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 14px;
  background: rgba(0,0,0,0.4);
  border-bottom: 1px solid var(--line);
  position: relative;
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot--r { background: #ff5f56; }
.dot--y { background: #ffbd2e; }
.dot--g { background: #27c93f; }
.terminal__title {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--fg-dim);
  pointer-events: none;
}
.terminal__body {
  margin: 0;
  padding: 22px 22px 26px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: #d1d5db;
  white-space: pre;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line-2) transparent;
}
.terminal__body::-webkit-scrollbar { height: 8px; }
.terminal__body::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 4px; }

.t-acc { color: var(--acc); font-weight: 600; }
.t-cmd { color: var(--info); }
.t-dim { color: var(--fg-dim); }
.t-grp { color: var(--fg); font-weight: 600; }
.t-num { color: var(--warn); }
.t-sel { color: var(--acc); }
.t-on  { color: var(--acc); font-weight: 700; }
.t-cur { color: var(--acc); font-weight: 700; }

.t-tag {
  display: inline-block;
  padding: 0 7px;
  margin-left: 6px;
  border-radius: 4px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  vertical-align: 1px;
}
.t-safe { background: rgba(34,197,94,0.12);  color: #4ade80; }
.t-rev  { background: rgba(245,158,11,0.14); color: var(--warn); }
.t-hold { background: rgba(239,68,68,0.14);  color: #fca5a5; }

.cursor {
  display: inline-block;
  width: 8px; margin-left: 3px;
  color: var(--acc);
  animation: blink 1.1s steps(2, end) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- stats ---------- */
.stats {
  margin-top: 32px;
  padding: 48px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stats__inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--fg);
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}
.stat__value [data-counter] {
  background: linear-gradient(180deg, var(--fg), var(--acc));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat__unit {
  font-size: 0.42em;
  color: var(--fg-mute);
  font-weight: 500;
  letter-spacing: 0;
}
.stat__label {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--fg-mute);
  max-width: 32ch;
}

/* ---------- sections ---------- */
.section { padding: 100px 0; border-top: 1px solid var(--line); }
.section--alt {
  background:
    radial-gradient(800px 400px at 80% 0%, rgba(34,197,94,0.04), transparent 60%),
    var(--bg);
}

.eyebrow {
  display: inline-block;
  padding: 5px 12px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--acc);
  background: var(--acc-glow);
  border: 1px solid rgba(34,197,94,0.3);
  border-radius: 999px;
}
.h2 {
  font-size: clamp(28px, 3.8vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 700;
  margin: 0 0 24px;
  max-width: 22ch;
}
.section__lede {
  color: var(--fg-mute);
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.6;
  margin: 0 0 36px;
}

/* highlights inline */
.hl { color: var(--acc); font-weight: 500; }

/* ---------- cards ---------- */
.cards {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.card {
  background: linear-gradient(180deg, var(--bg-1), var(--bg));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px 24px;
  transition: transform 0.22s ease, border-color 0.22s, background 0.22s;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: var(--radius);
  background: radial-gradient(circle at top right, rgba(34,197,94,0.08), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-2); }
.card:hover::before { opacity: 1; }
.card__icon {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 42px; height: 42px;
  border-radius: 10px;
  margin-bottom: 16px;
  background: var(--acc-glow);
  color: var(--acc);
  border: 1px solid rgba(34,197,94,0.22);
}
.card h3 { font-size: 17px; letter-spacing: -0.01em; margin-bottom: 6px; }
.card p  { color: var(--fg-mute); font-size: 14.5px; line-height: 1.55; }
.card code {
  color: var(--acc);
  font-size: 0.88em;
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 5px;
}

.chip {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.04em;
  vertical-align: 1px;
}
.chip--safe { background: rgba(34,197,94,0.14);  color: #4ade80; }
.chip--rev  { background: rgba(245,158,11,0.16); color: #fbbf24; }
.chip--hold { background: rgba(239,68,68,0.16);  color: #fca5a5; }
.chip--lg   { padding: 4px 12px; font-size: 12px; }

/* ---------- scan grid ---------- */
.scan-grid {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.scan {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.scan__title {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--acc);
  margin-bottom: 14px;
}
.scan ul li {
  padding: 7px 0;
  font-size: 14px;
  color: var(--fg-mute);
  border-bottom: 1px dashed var(--line);
}
.scan ul li:last-child { border-bottom: 0; }
.scan code {
  color: var(--fg);
  font-size: 0.92em;
  background: transparent;
  border: 0; padding: 0;
}

/* ---------- safety ---------- */
.safety { display: grid; gap: 14px; margin-top: 8px; }
.safety__row {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 24px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.safety__row::before {
  content: '';
  position: absolute;
  inset: 0;
  width: 4px;
}
.safety__row--safe::before { background: var(--acc); }
.safety__row--rev::before  { background: var(--warn); }
.safety__row--hold::before { background: var(--danger); }

.safety__row h3 { font-size: 17px; margin-bottom: 4px; }
.safety__row p  { color: var(--fg-mute); font-size: 14.5px; }
.safety__row kbd, .keys kbd, .bullets kbd, .lede kbd {
  background: var(--bg-3);
}

/* ---------- usage ---------- */
.usage {
  margin-top: 44px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 24px;
}
.code {
  background: linear-gradient(180deg, var(--bg-1), #0a0e15);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  padding: 28px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--fg);
  overflow-x: auto;
  white-space: pre;
}
.keys {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 28px;
}
.keys h3 {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--acc);
  margin-bottom: 16px;
}
.keys dl { display: grid; gap: 2px; }
.keys dl > div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  padding: 9px 0;
  align-items: baseline;
}
.keys dl > div + div { border-top: 1px solid var(--line); }
.keys dt { display: flex; gap: 4px; flex-wrap: wrap; }
.keys dd { color: var(--fg-mute); font-size: 14px; text-align: right; }

kbd {
  display: inline-block;
  padding: 1px 7px;
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--bg-2);
  font-family: var(--font-mono);
  font-size: 0.82em;
  color: var(--fg);
  line-height: 1.4;
}

/* ---------- cta ---------- */
.cta {
  padding: 110px 0;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(700px 280px at 50% 0%, rgba(34,197,94,0.10), transparent 70%),
    var(--bg);
  text-align: center;
}
.cta__inner { max-width: 760px; }
.cta .h2 { margin-left: auto; margin-right: auto; }
.cta__or {
  margin-top: 22px;
  font-size: 14.5px;
  color: var(--fg-mute);
}
.cta__or a { color: var(--acc); border-bottom: 1px dashed var(--line-2); }
.cta__or a:hover { border-color: var(--acc); }

/* ---------- footer ---------- */
.foot {
  border-top: 1px solid var(--line);
  padding: 40px 0 56px;
}
.foot__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
}
.foot__brand { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.foot__muted { color: var(--fg-dim); font-family: var(--font-mono); font-size: 12.5px; }
.foot__links { display: flex; gap: 22px; flex-wrap: wrap; }
.foot__links a {
  color: var(--fg-mute);
  font-size: 14px;
  transition: color 0.15s;
}
.foot__links a:hover { color: var(--acc); }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .hero__inner { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding: 64px 0 40px; }
  .terminal { max-width: 760px; margin: 0 auto; width: 100%; }
}

@media (max-width: 860px) {
  :root { --gutter: 22px; }
  .section { padding: 72px 0; }
  .cta { padding: 88px 0; }
  .cards { grid-template-columns: 1fr 1fr; }
  .scan-grid { grid-template-columns: 1fr 1fr; }
  .stats__inner { grid-template-columns: 1fr; gap: 28px; text-align: left; }
  .stat__label { max-width: 60ch; }
  .usage { grid-template-columns: 1fr; }
  .safety__row { grid-template-columns: 1fr; gap: 14px; padding: 22px; }
  .safety__row .chip { justify-self: start; }
  .bullets { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
  .scan-grid { grid-template-columns: 1fr; }
  .bullets { grid-template-columns: 1fr; }
  .h1 { font-size: 40px; }
  .terminal__body { font-size: 11.5px; padding: 16px 14px 20px; }
  .install__meta { font-size: 11.5px; }
  .ghbtn span { display: none; }
  .ghbtn { padding: 9px 10px; }
  .foot__inner { flex-direction: column; align-items: flex-start; }
}

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