:root {
  --bg: #f6f6fb;
  --bg-2: #ffffff;
  --ink: #12142a;
  --ink-2: #4b4f6b;
  --ink-3: #8a8ea8;
  --line: rgba(18, 20, 42, .09);
  --card: rgba(255, 255, 255, .78);
  --field: #ffffff;
  --accent: #5b5bf6;
  --accent-2: #12b5c9;
  --accent-ink: #ffffff;
  --accent-soft: rgba(91, 91, 246, .1);
  --shadow: 0 1px 2px rgba(18, 20, 42, .04), 0 18px 50px -18px rgba(40, 40, 120, .25);
  --r: 22px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0b0d17; --bg-2: #11142a; --ink: #eef0ff; --ink-2: #b4b8d6; --ink-3: #747a9e;
  --line: rgba(255, 255, 255, .08); --card: rgba(20, 23, 44, .72); --field: #0e1124;
  --accent: #8a8aff; --accent-2: #3ad6e8; --accent-ink: #0b0d17; --accent-soft: rgba(138, 138, 255, .14);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 24px 60px -20px rgba(0, 0, 0, .6);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 Manrope, system-ui, sans-serif; -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; }
button { font: inherit; color: inherit; cursor: pointer; }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }

.bg {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px 400px at 12% -5%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 70%),
    radial-gradient(500px 380px at 95% 10%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 70%);
}
.bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, #000 30%, transparent 75%);
}

/* top bar */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 24px;
  padding: 14px max(16px, calc((100vw - 1180px) / 2));
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.logo { display: flex; align-items: center; gap: 10px; font: 700 20px Unbounded, sans-serif; text-decoration: none; letter-spacing: -.02em; }
.logo-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; font-size: 17px;
}
.dot { color: var(--accent); }
.nav { display: flex; gap: 4px; margin-left: 12px; }
.nav a { padding: 8px 12px; border-radius: 10px; text-decoration: none; color: var(--ink-2); font-weight: 600; font-size: 14px; }
.nav a:hover { color: var(--ink); background: var(--accent-soft); }
.top-tools { margin-left: auto; display: flex; gap: 10px; align-items: center; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card); display: grid; place-items: center;
}
.icon-btn:hover { border-color: var(--accent); }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }

/* segmented control */
.seg {
  display: inline-flex; padding: 4px; gap: 2px; border-radius: 14px;
  background: var(--accent-soft); border: 1px solid var(--line);
}
.seg button {
  border: 0; background: transparent; padding: 8px 14px; border-radius: 10px;
  font-weight: 600; font-size: 14px; color: var(--ink-2); white-space: nowrap;
  transition: background .18s, color .18s, box-shadow .18s;
}
.seg button:hover:not(.on):not(:disabled) { color: var(--ink); }
.seg button.on { background: var(--bg-2); color: var(--ink); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.seg button:disabled { opacity: .35; cursor: not-allowed; }
.seg-sm button { padding: 5px 10px; font-size: 13px; }

/* hero */
main { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.hero { padding: 28px 0 8px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.hero-text { text-align: center; max-width: 760px; margin: 0 auto 36px; }
.badge {
  display: inline-flex; align-items: center; gap: 10px; padding: 6px 14px; border-radius: 99px;
  font-size: 13px; font-weight: 600; color: var(--ink-2); background: var(--card); border: 1px solid var(--line);
  max-width: 100%; text-align: left; line-height: 1.4;
}
.pulse { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; box-shadow: 0 0 0 0 rgba(34, 197, 94, .6); animation: pulse 2s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); } 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); } }
h1, h2, h3 { font-family: Manrope, system-ui, sans-serif; font-weight: 800; letter-spacing: -.035em; line-height: 1.1; margin: 0; }
h1 { font-size: clamp(32px, 5.6vw, 62px); margin: 20px 0 16px; }
.grad { background: linear-gradient(100deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 18px; color: var(--ink-2); margin: 0; }

/* converter */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  box-shadow: var(--shadow); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
}
.conv { position: relative; padding: 18px; }
.conv-head { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: end; gap: 12px; padding: 4px 4px 18px; }
.pick { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.pick:last-child { align-items: flex-end; }
.pick-label { font-size: 12px; font-weight: 700; color: var(--ink-3); text-transform: uppercase; letter-spacing: .08em; }
.pick .seg { max-width: 100%; overflow-x: auto; scrollbar-width: none; }
.swap {
  width: 44px; height: 44px; border-radius: 14px; border: 0; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff;
  box-shadow: 0 8px 20px -8px var(--accent); transition: transform .3s;
}
.swap:hover { transform: rotate(180deg); }
.panes { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; }
.pane {
  display: flex; flex-direction: column; min-width: 0; background: var(--field); border: 1px solid var(--line);
  border-radius: 16px; overflow: hidden; transition: border-color .2s, box-shadow .2s;
}
.pane:focus-within { border-color: color-mix(in srgb, var(--accent) 60%, transparent); box-shadow: 0 0 0 4px var(--accent-soft); }
.pane.out { background: color-mix(in srgb, var(--accent-soft) 45%, var(--field)); }
.pane-bar, .pane-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px; min-height: 52px; }
.pane-foot { border-top: 1px solid var(--line); }
.detected { font-size: 13px; font-weight: 600; color: var(--ink-3); }
.detected b { color: var(--accent); }
.keys { display: flex; gap: 4px; }
.keys button {
  width: 32px; height: 32px; border-radius: 9px; border: 1px solid var(--line); background: var(--bg-2);
  font-weight: 700; font-size: 15px;
}
.keys button:hover { border-color: var(--accent); color: var(--accent); }
textarea {
  flex: 1; width: 100%; min-height: 240px; resize: vertical; border: 0; outline: 0;
  padding: 4px 16px 16px; background: transparent; color: var(--ink);
  font: 500 18px/1.65 Manrope, system-ui, sans-serif;
}
textarea::placeholder { color: var(--ink-3); }
.count { font-size: 13px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.actions { display: flex; gap: 6px; }
.btn {
  display: inline-flex; align-items: center; gap: 7px; height: 36px; padding: 0 14px; border-radius: 11px;
  font-weight: 600; font-size: 14px; border: 1px solid var(--line); background: var(--bg-2); cursor: pointer;
  transition: border-color .15s, transform .1s;
}
.btn:active { transform: scale(.97); }
.btn.ghost:hover { border-color: var(--accent); }
.btn.primary { background: var(--ink); color: var(--bg); border-color: transparent; }
.btn.primary:hover { background: var(--accent); color: var(--accent-ink); }
.opt { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.opt input { accent-color: var(--accent); }
.drop-hint {
  position: absolute; inset: 0; display: none; place-items: center; border-radius: var(--r);
  border: 2px dashed var(--accent); background: color-mix(in srgb, var(--bg) 85%, transparent);
  font: 600 18px Unbounded, sans-serif; color: var(--accent);
}
.conv.drag .drop-hint { display: grid; }

/* sections */
.section { padding: 72px 0 8px; }
.sec-head { max-width: 640px; margin-bottom: 28px; }
.eyebrow { font-size: 13px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .1em; }
h2 { font-size: clamp(24px, 3.4vw, 36px); margin: 8px 0 10px; }
.sec-head p { color: var(--ink-2); margin: 0; }

.changes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.chg {
  padding: 22px; border-radius: var(--r); background: var(--card); border: 1px solid var(--line);
  transition: transform .2s, border-color .2s;
}
.chg:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.glyphs { display: flex; align-items: baseline; gap: 12px; font-family: Unbounded, sans-serif; margin-bottom: 14px; }
.glyphs .old { font-family: Manrope, sans-serif; font-weight: 700; font-size: 26px; color: var(--ink-3); text-decoration: line-through; text-decoration-thickness: 2px; }
.glyphs .arr { color: var(--ink-3); }
.glyphs .new { font-size: 52px; font-weight: 700; line-height: 1; background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.chg p { margin: 0; color: var(--ink-2); font-size: 15px; }
.chg b { color: var(--ink); }
.rules { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 14px; }
.rule { padding: 20px 22px; border-radius: var(--r); border: 1px dashed var(--line); }
.rule h3 { font-size: 16px; margin-bottom: 6px; }
.rule p { margin: 0; color: var(--ink-2); font-size: 15px; }

.abc { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 10px; }
.tile {
  position: relative; padding: 14px 10px 10px; border-radius: 16px; text-align: center;
  background: var(--card); border: 1px solid var(--line); cursor: pointer; transition: transform .15s, border-color .15s;
}
.tile:hover { transform: translateY(-2px); border-color: var(--accent); }
.tile .L { display: block; font: 700 30px/1.1 Unbounded, sans-serif; }
.tile .sub { display: flex; justify-content: center; gap: 8px; margin-top: 6px; font-size: 12px; color: var(--ink-3); font-weight: 600; }
.tile.is-new { background: linear-gradient(160deg, var(--accent-soft), transparent 70%), var(--card); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.tile.is-new .L { color: var(--accent); }
.tile.is-new::after { content: "yangi"; position: absolute; top: 6px; right: 8px; font-size: 9px; font-weight: 700; text-transform: uppercase; color: var(--accent); letter-spacing: .06em; }

.timeline { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; counter-reset: s; }
.timeline li { position: relative; padding: 20px 18px 18px; border-radius: var(--r); background: var(--card); border: 1px solid var(--line); }
.timeline li::before {
  counter-increment: s; content: counter(s); display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font: 700 13px Unbounded, sans-serif; margin-bottom: 12px;
}
.timeline li.now { border-color: var(--accent); }
.timeline li.now::before { background: var(--accent); color: var(--accent-ink); }
.timeline time { font-weight: 700; font-size: 15px; }
.timeline p { margin: 4px 0 0; color: var(--ink-2); font-size: 14px; line-height: 1.5; }

.faq details { border-bottom: 1px solid var(--line); max-width: 820px; }
.faq summary {
  list-style: none; cursor: pointer; padding: 18px 40px 18px 0; position: relative; font-weight: 700; font-size: 17px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font: 500 24px Unbounded, sans-serif; color: var(--accent); transition: transform .2s;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { margin: 0 0 18px; color: var(--ink-2); }

.foot {
  max-width: 1180px; margin: 72px auto 0; padding: 28px 16px 40px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; color: var(--ink-3); font-size: 14px;
}
.foot a { color: var(--ink-2); }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  padding: 12px 20px; border-radius: 14px; background: var(--ink); color: var(--bg); font-weight: 600; font-size: 14px;
  transition: opacity .2s, transform .2s; z-index: 50;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 960px) {
  .changes { grid-template-columns: repeat(2, 1fr); }
  .rules { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr 1fr; }
  .nav { display: none; }
}
@media (max-width: 720px) {
  .hero { padding-top: 16px; }
  .lead { font-size: 16px; }
  .conv { padding: 12px; }
  .conv-head { grid-template-columns: minmax(0, 1fr); justify-items: stretch; }
  .pick, .pick:last-child { align-items: stretch; }
  .pick .seg { display: flex; }
  .pick .seg button { flex: 1 1 0; min-width: 0; padding: 8px 4px; font-size: 13px; }
  .swap { justify-self: center; transform: rotate(90deg); }
  .swap:hover { transform: rotate(270deg); }
  .panes { grid-template-columns: minmax(0, 1fr); }
  .top { gap: 12px; }
  .pane-bar { flex-wrap: wrap; }
  textarea { min-height: 160px; font-size: 17px; }
  .btn span { display: none; }
  .btn { padding: 0 11px; }
  .timeline { grid-template-columns: 1fr; }
  .section { padding-top: 56px; }
}
@media (max-width: 420px) {
  .changes { grid-template-columns: 1fr; }
  .keys button { width: 28px; height: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}