/* kuro */
:root {
  --bg:        #000;
  --fg:        #e8e8e8;
  --dim:       #6a6a6a;
  --line:      #1a1a1a;
  --line2:     #2a2a2a;
  --accent:    #ffffff;
  --good:      #6cff8d;
  --bad:       #ff6c6c;
  --curve:     #c8c8c8;
  --mono: ui-monospace, "JetBrains Mono", "Fira Code", "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--fg); text-decoration: none; }
a:hover { color: #fff; }

h1, h2, h3 { font-weight: 400; letter-spacing: -0.01em; margin: 0 0 0.6em; }
h1 { font-size: 38px; line-height: 1.1; }
h2 { font-size: 18px; color: var(--dim); margin-top: 2.2em; }
h3 { font-size: 14px; color: var(--fg); margin-top: 1.6em; }
code { background: var(--line); padding: 1px 6px; border-radius: 2px; font-size: 0.95em; }

input[type=number] {
  width: 100%;
  background: transparent;
  border: 1px solid var(--line2);
  color: var(--fg);
  font: inherit;
  font-size: 16px;       /* ≥16px prevents iOS auto-zoom on focus */
  padding: 12px 14px;
  min-height: 44px;
  margin: 6px 0 12px;
  border-radius: 0;
  -webkit-appearance: none;
}
input[type=number]:focus { outline: none; border-color: var(--fg); }
/* hide spinner */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type=number] { -moz-appearance: textfield; }

/* ---------- header ---------- */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 32px;
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
  z-index: 10;
}
.logo { display: flex; align-items: baseline; gap: 10px; }
.kanji { font-size: 22px; color: #fff; }
.brand { font-size: 14px; letter-spacing: 0.06em; color: var(--dim); }
nav a {
  margin-left: 22px;
  font-size: 13px;
  color: var(--dim);
}
nav a:hover { color: #fff; }

/* ---------- main ---------- */

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 60px 32px 80px;
}

/* hero */
.hero { padding: 30px 0 50px; }
.hero h1 { font-weight: 300; }
.lede { color: var(--fg); margin: 0 0 26px; font-size: 15px; max-width: 70ch; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 18px;
  min-height: 44px;
  border: 1px solid var(--line2);
  background: transparent;
  color: var(--fg);
  font: inherit;
  cursor: pointer;
  border-radius: 0;
  transition: 120ms;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.btn:hover { border-color: var(--fg); color: #fff; }
.btn.primary { background: var(--fg); color: #000; border-color: var(--fg); }
.btn.primary:hover { background: #fff; color: #000; }
.btn.primary:disabled, .btn.ghost:disabled { background: transparent; color: var(--dim); border-color: var(--line2); cursor: not-allowed; }
.btn.primary:disabled { background: var(--line2); }
.btn.ghost { background: transparent; }

/* ---------- curve / chart ---------- */

.curve { padding: 40px 0; }
.curve-lede { color: var(--fg); margin: 0 0 22px; max-width: 70ch; }

.chart-wrap {
  border: 1px solid var(--line2);
  background: #050505;
  padding: 14px;
  margin: 20px 0 24px;
}
#chart {
  width: 100%;
  height: 360px;
  display: block;
}
#chart .axis     { stroke: var(--line2); stroke-width: 1; }
#chart .grid     { stroke: var(--line);  stroke-width: 1; }
#chart .curve    { stroke: var(--curve); stroke-width: 1.5; fill: none; }
#chart .filled   { fill: rgba(200,200,200,0.06); stroke: none; }
#chart .marker   { fill: #fff; }
#chart .markline { stroke: var(--dim); stroke-width: 1; stroke-dasharray: 2 3; }
#chart .label    { fill: var(--dim); font-family: var(--mono); font-size: 10px; }
#chart .label-bright { fill: #fff; font-family: var(--mono); font-size: 11px; }

.curve-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.curve-stats .stat {
  background: var(--bg);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.curve-stats .stat .k { font-size: 11px; color: var(--dim); }
.curve-stats .stat .v { font-size: 16px; color: #fff; font-weight: 300; }

/* generic stats grid (yield) */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 30px 0 0;
}
.stats .stat {
  background: var(--bg);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stats .stat .k { font-size: 11px; color: var(--dim); }
.stats .stat .v { font-size: 16px; color: #fff; font-weight: 300; }

/* ---------- prose ---------- */

.prose { padding: 40px 0; }
.prose p { margin: 0 0 14px; max-width: 70ch; }
.prose ul { padding-left: 18px; margin: 0 0 18px; max-width: 70ch; }
.prose li { margin: 0 0 6px; }
.prose .lab { color: var(--dim); font-size: 11px; }

/* ---------- trade ---------- */

.trade { padding: 40px 0; }
.trade-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}
.trade-card {
  border: 1px solid var(--line2);
  padding: 22px 24px;
}
.trade-card h3 { margin-top: 0; }
.trade-card .hint { color: var(--dim); font-size: 12px; margin: 0 0 12px; }
.trade-card label { display: block; color: var(--dim); font-size: 11px; margin-top: 8px; }
.trade-card .actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
.trade-card .actions .btn { flex: 1; min-width: 90px; }

.advanced { margin-top: 14px; }
.advanced summary {
  cursor: pointer;
  color: var(--dim);
  font-size: 11px;
  padding: 6px 0;
  list-style: none;
  -webkit-user-select: none; user-select: none;
}
.advanced summary::-webkit-details-marker { display: none; }
.advanced summary::before { content: '+ '; }
.advanced[open] summary::before { content: '− '; }
.advanced .actions { margin-top: 6px; }

/* ---------- claim ---------- */

.claim { padding: 40px 0; }
.claim-card {
  border: 1px solid var(--line2);
  padding: 24px 26px;
  margin-top: 16px;
}

/* row used in claim + trade */
.row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px dashed var(--line);
}
.row:last-of-type { border: none; }
.row .lab { color: var(--dim); font-size: 12px; }
.row .val { color: #fff; font-size: 13px; word-break: break-all; max-width: 60%; text-align: right; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; padding-top: 10px; }

.note { color: var(--dim); font-size: 12px; margin: 14px 0 0; min-height: 1em; }
.note.bad  { color: var(--bad); }
.note.good { color: var(--good); }

/* ---------- footer ---------- */

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 24px 32px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 12px;
}
footer .links a { color: var(--dim); }
footer .links a:hover { color: #fff; }

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  header { padding: 16px; }
  nav a { margin-left: 14px; font-size: 12px; }
  main { padding: 30px 18px 60px; }
  h1 { font-size: 28px; }
  .stats, .curve-stats { grid-template-columns: repeat(2, 1fr); }
  .trade-cards { grid-template-columns: 1fr; }
  #chart { height: 260px; }
}
@media (max-width: 420px) {
  .stats, .curve-stats { grid-template-columns: 1fr; }
}