:root {
  --bg: #071418;
  --bg-soft: #0b1b20;
  --card: rgba(14, 35, 41, .78);
  --line: rgba(91, 237, 178, .2);
  --green: #00e676;
  --green-soft: #75f5b3;
  --cyan: #26d9ff;
  --red: #ff6b7a;
  --text: #edf8f4;
  --muted: #91aaa4;
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 84% 5%, rgba(0, 230, 118, .12), transparent 30rem),
    radial-gradient(circle at 5% 48%, rgba(38, 217, 255, .07), transparent 26rem),
    var(--bg);
  font: 16px/1.6 Manrope, system-ui, sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: .33;
  background-image:
    linear-gradient(rgba(91, 237, 178, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 237, 178, .055) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, black, transparent 90%);
}

button, input, select { font: inherit; }
a { color: inherit; }
.shell { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(91, 237, 178, .13);
  background: rgba(7, 20, 24, .76);
  backdrop-filter: blur(18px);
}

.nav-inner {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font: 800 15px "JetBrains Mono", monospace;
  letter-spacing: .1em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  color: #04110b;
  background: var(--green);
  border-radius: 8px;
  box-shadow: 0 0 26px rgba(0, 230, 118, .45);
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--green-soft);
  font: 600 11px "JetBrains Mono", monospace;
  letter-spacing: .08em;
}

.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(0, 230, 118, .1), 0 0 16px var(--green);
}

.hero {
  padding: 94px 0 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 80px;
  align-items: end;
}

.eyebrow, .step {
  color: var(--green);
  font: 700 12px "JetBrains Mono", monospace;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1 {
  margin: 18px 0 24px;
  font-size: clamp(46px, 7vw, 84px);
  line-height: .98;
  letter-spacing: -.055em;
}

h1 span {
  color: transparent;
  background: linear-gradient(100deg, var(--green), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
}

.hero p {
  max-width: 720px;
  margin: 0;
  color: #aec3be;
  font-size: clamp(17px, 2vw, 20px);
}

.source-card {
  padding: 25px;
  display: grid;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(11, 29, 34, .78);
}

.source-label { color: var(--muted); font-size: 12px; }
.source-card strong { font-size: 19px; }
.source-card code {
  width: fit-content;
  padding: 6px 9px;
  color: var(--cyan);
  background: rgba(38, 217, 255, .07);
  border-radius: 7px;
  font: 600 12px "JetBrains Mono", monospace;
}
.source-card > span:last-child { color: var(--muted); font-size: 13px; }

.panel {
  margin-bottom: 22px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(13, 34, 40, .9), rgba(7, 22, 26, .88));
  box-shadow: 0 24px 90px rgba(0, 0, 0, .24);
}

.panel-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 28px;
}

h2 {
  margin: 7px 0 0;
  font-size: clamp(28px, 4vw, 43px);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.date-field { display: grid; gap: 7px; }
.date-field span, .money-field > span {
  color: var(--muted);
  font: 600 12px "JetBrains Mono", monospace;
  text-transform: uppercase;
  letter-spacing: .07em;
}

input, select {
  color: var(--text);
  border: 1px solid rgba(91, 237, 178, .24);
  background: #08171b;
  outline: none;
}

input:focus, select:focus, button:focus-visible {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(0, 230, 118, .1);
}

.date-field input {
  min-width: 210px;
  min-height: 48px;
  padding: 0 14px;
  border-radius: 11px;
  color-scheme: dark;
}

.notice {
  min-height: 44px;
  display: none;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  padding: 11px 14px;
  color: #b8cbc6;
  border: 1px solid rgba(38, 217, 255, .17);
  border-radius: 10px;
  background: rgba(38, 217, 255, .04);
  font-size: 13px;
}
.notice.visible { display: flex; }
.notice.error { color: #ffd4d9; border-color: rgba(255, 107, 122, .35); background: rgba(255, 107, 122, .06); }
.notice.info { color: #c3eefa; }

.loader {
  width: 15px;
  height: 15px;
  border: 2px solid rgba(38, 217, 255, .2);
  border-top-color: var(--cyan);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.rate-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.rate-card {
  min-height: 164px;
  padding: 22px;
  border: 1px solid rgba(91, 237, 178, .15);
  border-radius: 15px;
  background: rgba(255, 255, 255, .018);
}

.rate-top { display: flex; justify-content: space-between; gap: 14px; }
.rate-code { color: var(--cyan); font: 800 18px "JetBrains Mono", monospace; }
.rate-nominal { color: #63817a; font: 500 11px "JetBrains Mono", monospace; }
.rate-name {
  min-height: 42px;
  margin: 12px 0 18px;
  color: var(--muted);
  font-size: 13px;
}
.rate-value { font: 800 27px "JetBrains Mono", monospace; letter-spacing: -.04em; }
.rate-change { margin-left: 8px; font: 600 11px "JetBrains Mono", monospace; }
.rate-change.up { color: var(--green); }
.rate-change.down { color: var(--red); }

.skeleton {
  background:
    linear-gradient(100deg, transparent 25%, rgba(255,255,255,.045) 40%, transparent 55%),
    rgba(255,255,255,.018);
  background-size: 250% 100%;
  animation: shimmer 1.25s infinite;
}
@keyframes shimmer { to { background-position-x: -200%; } }

.data-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 18px;
  color: #6f8c85;
  font: 500 11px "JetBrains Mono", monospace;
}
.data-meta a { color: var(--green-soft); text-decoration: none; }

.converter-head { align-items: center; }
.rate-badge {
  padding: 9px 12px;
  color: var(--green-soft);
  border: 1px solid rgba(0, 230, 118, .25);
  border-radius: 999px;
  background: rgba(0, 230, 118, .05);
  font: 600 11px "JetBrains Mono", monospace;
}

.converter-grid {
  display: grid;
  grid-template-columns: 1fr 48px 1fr;
  gap: 14px;
  align-items: end;
}

.money-field { display: grid; gap: 9px; }
.money-control {
  min-height: 70px;
  display: grid;
  grid-template-columns: 1fr 140px;
  border: 1px solid rgba(91, 237, 178, .24);
  border-radius: 14px;
  background: #08171b;
  overflow: hidden;
}

.money-control:focus-within {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(0, 230, 118, .1);
}

.money-control input, .money-control select, .money-control output {
  min-width: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.money-control input, .money-control output {
  padding: 0 20px;
  align-self: center;
  font: 800 clamp(23px, 4vw, 34px) "JetBrains Mono", monospace;
}

.money-control select {
  padding: 0 14px;
  border-left: 1px solid rgba(91, 237, 178, .15);
  color: var(--green-soft);
  font: 700 14px "JetBrains Mono", monospace;
}

.money-control option { color: var(--text); background: #08171b; }
.result-field output { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.swap {
  width: 48px;
  height: 48px;
  color: var(--green);
  border: 1px solid rgba(0, 230, 118, .3);
  border-radius: 50%;
  background: rgba(0, 230, 118, .05);
  cursor: pointer;
  font: 700 23px "JetBrains Mono", monospace;
  transition: transform .2s ease, background .2s ease;
}
.swap:hover { transform: rotate(180deg); background: rgba(0, 230, 118, .11); }

.formula {
  margin-top: 18px;
  padding: 13px 15px;
  color: #77938c;
  border-left: 2px solid var(--cyan);
  background: rgba(38, 217, 255, .035);
  font: 500 12px/1.6 "JetBrains Mono", monospace;
}

.how-it-works {
  margin: 88px 0;
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  gap: 70px;
}
.how-it-works ol {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  list-style: none;
}
.how-it-works li {
  display: flex;
  gap: 18px;
  padding: 20px;
  border: 1px solid rgba(91, 237, 178, .13);
  border-radius: 13px;
  background: rgba(255, 255, 255, .018);
}
.how-it-works li > span { color: var(--green); font: 700 12px "JetBrains Mono", monospace; }
.how-it-works p { margin: 0; color: var(--muted); }
.how-it-works b { color: var(--text); }

footer {
  padding: 28px 0 46px;
  color: #68847d;
  border-top: 1px solid rgba(91, 237, 178, .1);
  font: 500 12px "JetBrains Mono", monospace;
}
.footer-inner { display: flex; justify-content: space-between; gap: 24px; }
.footer-inner strong { color: var(--green); }

@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; gap: 35px; }
  .source-card { max-width: 420px; }
  .rate-grid { grid-template-columns: 1fr 1fr; }
  .converter-grid { grid-template-columns: 1fr; }
  .swap { margin: 0 auto; transform: rotate(90deg); }
  .swap:hover { transform: rotate(270deg); }
  .how-it-works { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 28px, 1160px); }
  .nav-status { font-size: 0; }
  .hero { padding: 66px 0 48px; }
  h1 { font-size: 49px; }
  .panel { padding: 22px; }
  .panel-head, .data-meta { align-items: stretch; flex-direction: column; }
  .date-field input { width: 100%; }
  .rate-grid { grid-template-columns: 1fr; }
  .money-control { grid-template-columns: 1fr 108px; }
  .money-control input, .money-control output { padding: 0 14px; font-size: 24px; }
  .rate-badge { width: fit-content; }
  .footer-inner { flex-direction: column; }
}

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