/* ============ tokens ============ */
:root {
  --bg: #0a0e14;
  --bg-raise: #0f1520;
  --bg-panel: #101826;
  --line: #1d2939;
  --line-soft: #16202e;
  --text: #dbe4f0;
  --text-dim: #8494ab;
  --text-faint: #55637a;
  --accent: #3ddc97;
  --accent-dim: rgba(61, 220, 151, 0.12);
  --accent-glow: rgba(61, 220, 151, 0.35);
  --danger: #ff6b6b;
  --warn: #ffc86b;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
  --radius: 10px;
  --radius-lg: 14px;
  --speed: 200ms;
}

/* ============ base ============ */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 500px at 50% -180px, rgba(61, 220, 151, 0.07), transparent 65%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

code { font-family: var(--mono); font-size: 0.88em; background: var(--bg-raise); border: 1px solid var(--line); padding: 1px 6px; border-radius: 5px; color: var(--accent); }
kbd { font-family: var(--mono); font-size: 0.75em; background: var(--bg-raise); border: 1px solid var(--line); border-bottom-width: 2px; padding: 1px 6px; border-radius: 5px; color: var(--text-dim); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ============ topbar ============ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  max-width: 1080px; margin: 0 auto; padding: 14px 24px;
  backdrop-filter: blur(10px);
  background: rgba(10, 14, 20, 0.78);
  border-bottom: 1px solid var(--line-soft);
}
.topbar__brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-weight: 700; font-size: 1.05rem;
  color: var(--text); text-decoration: none; letter-spacing: -0.02em;
}
.topbar__brand-accent { color: var(--accent); }
.topbar__logo { display: block; }
.topbar__nav { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.topbar__nav a {
  color: var(--text-dim); text-decoration: none; font-size: 0.85rem;
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 8px 12px; border-radius: 8px; transition: color var(--speed), background var(--speed);
}
.topbar__nav a:hover { color: var(--text); background: var(--bg-raise); }
@media (max-width: 560px) { .topbar__nav li:nth-child(n+3) { display: none; } }

/* ============ hero ============ */
.hero { max-width: 1080px; margin: 0 auto; padding: 48px 24px 32px; }
.hero__kicker {
  font-family: var(--mono); font-size: 0.8rem; color: var(--accent);
  letter-spacing: 0.08em; margin: 0 0 14px;
}
.hero__title {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.05; margin: 0 0 14px; letter-spacing: -0.03em; font-weight: 800;
  background: linear-gradient(180deg, #fff 30%, #93a5bd);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__sub { max-width: 560px; margin: 0 0 28px; color: var(--text-dim); font-size: 1.02rem; }
.hero__sub strong { color: var(--accent); font-family: var(--mono); font-weight: 600; }

/* ============ panel ============ */
.panel {
  background: linear-gradient(180deg, var(--bg-panel), var(--bg-raise));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 0 rgba(255,255,255,0.03) inset, 0 24px 60px -30px rgba(0,0,0,0.7);
  overflow: hidden;
}

.panel__controls {
  display: grid;
  grid-template-columns: auto minmax(180px, 1fr) auto auto;
  gap: 20px; align-items: end;
  padding: 20px 22px;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(255,255,255,0.015);
}
@media (max-width: 900px) { .panel__controls { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .panel__controls { grid-template-columns: 1fr; } }

.ctrl { border: 0; margin: 0; padding: 0; min-width: 0; }
.ctrl__label {
  display: block; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-faint); margin-bottom: 8px; padding: 0;
}

/* segmented control */
.seg { display: inline-flex; background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 3px; gap: 3px; }
.seg__btn {
  appearance: none; border: 0; cursor: pointer;
  background: transparent; color: var(--text-dim);
  font-family: var(--mono); font-weight: 700; font-size: 0.92rem;
  padding: 8px 14px; border-radius: 7px; min-height: 44px;
  display: flex; align-items: baseline; gap: 7px;
  transition: background var(--speed), color var(--speed), box-shadow var(--speed);
}
.seg__hint { font-size: 0.62rem; font-weight: 400; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-faint); }
.seg__btn:hover { color: var(--text); }
.seg__btn.is-active {
  background: var(--accent-dim); color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-glow) inset;
}
.seg__btn.is-active .seg__hint { color: var(--accent); opacity: 0.7; }

/* quantity */
.qty { display: flex; align-items: center; gap: 14px; height: 44px; }
.qty input[type="range"] { flex: 1; accent-color: var(--accent); min-width: 0; }
.qty__out {
  font-family: var(--mono); font-weight: 700; font-size: 1rem; color: var(--accent);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
  min-width: 52px; text-align: center; padding: 8px 6px;
}

/* toggles */
.opts { display: flex; flex-wrap: wrap; gap: 8px; }
.toggle {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; color: var(--text-dim);
  background: var(--bg); border: 1px solid var(--line); border-radius: 999px;
  padding: 9px 13px; min-height: 44px;
  transition: border-color var(--speed), color var(--speed), background var(--speed);
  user-select: none;
}
.toggle input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.toggle__box {
  width: 12px; height: 12px; border-radius: 3px; flex: none;
  border: 1.5px solid var(--text-faint); transition: all var(--speed);
}
.toggle:hover { border-color: var(--text-faint); color: var(--text); }
.toggle input:checked + .toggle__box { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }
.toggle input:checked ~ * , .toggle:has(input:checked) { color: var(--accent); border-color: var(--accent-glow); background: var(--accent-dim); }
.toggle input:focus-visible + .toggle__box { outline: 2px solid var(--accent); outline-offset: 2px; }

/* generate button */
.btn-gen {
  appearance: none; border: 0; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--mono); font-weight: 700; font-size: 0.95rem; letter-spacing: 0.02em;
  color: #06281b; background: var(--accent);
  padding: 12px 22px; min-height: 48px; border-radius: var(--radius);
  box-shadow: 0 0 0 1px var(--accent-glow), 0 8px 24px -8px var(--accent-glow);
  transition: transform var(--speed), box-shadow var(--speed), filter var(--speed);
}
.btn-gen:hover { filter: brightness(1.08); transform: translateY(-1px); box-shadow: 0 0 0 1px var(--accent-glow), 0 12px 32px -8px var(--accent-glow); }
.btn-gen:active { transform: translateY(0); }
.btn-gen kbd { color: inherit; opacity: 0.65; border-color: rgba(0,0,0,0.25); background: rgba(0,0,0,0.12); border-bottom-color: rgba(0,0,0,0.3); }
@media (max-width: 560px) { .btn-gen kbd { display: none; } }
.btn-gen--inline { text-decoration: none; color: #06281b; }

/* results */
.panel__results { padding: 18px 22px 22px; }
.results-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.results-head__count { font-family: var(--mono); font-size: 0.78rem; color: var(--text-faint); letter-spacing: 0.05em; }
.results-head__actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn-mini {
  appearance: none; cursor: pointer;
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 0.76rem; font-weight: 600; letter-spacing: 0.04em;
  color: var(--text-dim); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; min-height: 40px;
  transition: color var(--speed), border-color var(--speed), background var(--speed);
}
.btn-mini:hover { color: var(--accent); border-color: var(--accent-glow); background: var(--accent-dim); }
.btn-mini--danger:hover { color: var(--danger); border-color: rgba(255,107,107,0.4); background: rgba(255,107,107,0.08); }

.uuid-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; max-height: 340px; overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
.uuid-list li {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--bg); border: 1px solid var(--line-soft); border-radius: 8px;
  padding: 4px 6px 4px 14px;
  animation: rowIn 260ms ease both;
  transition: border-color var(--speed);
}
.uuid-list li:hover { border-color: var(--line); }
.uuid-list li:nth-child(1) { animation-delay: 0ms; } 
.uuid-list code {
  font-size: clamp(0.72rem, 2.6vw, 0.9rem); background: none; border: 0; padding: 0;
  color: var(--text); overflow-wrap: anywhere; user-select: all;
}
.uuid-list code b { color: var(--accent); font-weight: 600; }
.uuid-list .row-copy {
  appearance: none; border: 0; cursor: pointer; flex: none;
  width: 36px; height: 36px; border-radius: 7px;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--text-faint); background: transparent;
  transition: color var(--speed), background var(--speed);
}
.uuid-list .row-copy:hover { color: var(--accent); background: var(--accent-dim); }
.uuid-list .row-copy.is-copied { color: var(--accent); }
@keyframes rowIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.uuid-list__empty { text-align: center; color: var(--text-faint); font-size: 0.9rem; margin: 18px 0 6px; }
.uuid-list:not(:empty) + .uuid-list__empty { display: none; }

/* subgrid cards */
.subgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
@media (max-width: 760px) { .subgrid { grid-template-columns: 1fr; } }
.card {
  background: var(--bg-raise); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 18px 20px;
}
.card__title {
  display: flex; align-items: center; gap: 8px; margin: 0 0 14px;
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim);
}
.card__title svg { color: var(--accent); }
.card__head-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.card__head-row .card__title { margin-bottom: 14px; }

.validate-input {
  width: 100%; font-family: var(--mono); font-size: 0.95rem; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px; min-height: 46px;
  transition: border-color var(--speed), box-shadow var(--speed);
}
.validate-input::placeholder { color: var(--text-faint); }
.validate-input:focus { outline: none; border-color: var(--accent-glow); box-shadow: 0 0 0 3px var(--accent-dim); }

.validate-result {
  display: flex; align-items: center; gap: 10px; margin-top: 12px;
  font-family: var(--mono); font-size: 0.82rem; color: var(--text-faint);
  min-height: 24px;
}
.validate-result__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-faint); flex: none; transition: background var(--speed), box-shadow var(--speed); }
.validate-result.is-valid { color: var(--accent); }
.validate-result.is-valid .validate-result__dot { background: var(--accent); box-shadow: 0 0 10px var(--accent-glow); }
.validate-result.is-invalid { color: var(--danger); }
.validate-result.is-invalid .validate-result__dot { background: var(--danger); box-shadow: 0 0 10px rgba(255,107,107,0.4); }

.history { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; max-height: 150px; overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
.history li {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  font-family: var(--mono); font-size: 0.76rem; color: var(--text-dim);
  background: var(--bg); border: 1px solid var(--line-soft); border-radius: 7px; padding: 7px 12px;
}
.history li span b { color: var(--accent); font-weight: 700; }
.history button {
  appearance: none; border: 0; cursor: pointer; flex: none;
  font-family: var(--mono); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em;
  color: var(--text-faint); background: transparent; padding: 4px 8px; border-radius: 5px;
  transition: color var(--speed), background var(--speed);
}
.history button:hover { color: var(--accent); background: var(--accent-dim); }
.history__empty { color: var(--text-faint); font-size: 0.85rem; margin: 4px 0 0; }
.history:not(:empty) ~ .history__empty { display: none; }

/* ============ content ============ */
.content { max-width: 760px; margin: 0 auto; padding: 40px 24px 56px; display: flex; flex-direction: column; gap: 44px; }
.content h2 { font-size: 1.6rem; letter-spacing: -0.02em; margin: 0 0 14px; }
.content p { color: var(--text-dim); margin: 0 0 12px; }
.content strong { color: var(--text); }
.content ul.usecases { color: var(--text-dim); padding-left: 20px; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.content ul.usecases strong { color: var(--text); }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.cmp-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 520px; }
.cmp-table th, .cmp-table td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line-soft); }
.cmp-table thead th { font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-faint); background: var(--bg-raise); }
.cmp-table tbody tr:last-child td { border-bottom: 0; }
.cmp-table td:first-child code { color: var(--accent); }
.cmp-table td { color: var(--text-dim); }

details { background: var(--bg-raise); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
summary {
  cursor: pointer; padding: 15px 18px; font-weight: 600; font-size: 0.98rem; color: var(--text);
  list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  transition: color var(--speed);
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-family: var(--mono); color: var(--accent); font-size: 1.1rem; transition: transform var(--speed); flex: none; }
details[open] summary::after { transform: rotate(45deg); }
summary:hover { color: var(--accent); }
details p { padding: 0 18px 16px; margin: 0; }

.cta-box {
  text-align: center; padding: 36px 24px;
  background: linear-gradient(180deg, var(--accent-dim), transparent 70%), var(--bg-raise);
  border: 1px solid var(--accent-glow); border-radius: var(--radius-lg);
}
.cta-box h2 { margin-bottom: 8px; }
.cta-box p { max-width: 480px; margin: 0 auto 20px; }

/* ============ footer ============ */
.footer { border-top: 1px solid var(--line-soft); padding: 28px 24px 40px; text-align: center; }
.footer__brand { font-family: var(--mono); font-size: 0.85rem; color: var(--text-dim); margin: 0 0 12px; }
.footer__brand span { color: var(--accent); }
.footer__links { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px 20px; list-style: none; margin: 0; padding: 0; }
.footer__links a { color: var(--text-faint); text-decoration: none; font-size: 0.85rem; transition: color var(--speed); }
.footer__links a:hover { color: var(--accent); }

/* ============ toast ============ */
.toast {
  position: fixed; left: 50%; bottom: 28px; z-index: 100;
  transform: translate(-50%, 80px);
  font-family: var(--mono); font-size: 0.85rem; font-weight: 600;
  color: var(--accent); background: var(--bg-panel);
  border: 1px solid var(--accent-glow); border-radius: 999px;
  padding: 11px 22px; pointer-events: none;
  box-shadow: 0 12px 40px -10px rgba(0,0,0,0.8), 0 0 20px -6px var(--accent-glow);
  opacity: 0; transition: transform 280ms cubic-bezier(0.2, 0.9, 0.3, 1.2), opacity 280ms;
}
.toast.is-visible { transform: translate(-50%, 0); opacity: 1; }

/* ============ reveal animation ============ */
.reveal { animation: riseIn 500ms ease both; }
.reveal:nth-child(2) { animation-delay: 90ms; }
@keyframes riseIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}