@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=IBM+Plex+Mono:wght@400;600&display=swap");

:root {
  --bg: #070707;
  --surface: #0f0f10;
  --surface-muted: #131315;
  --text: #f7f5e8;
  --muted: #c7c2a8;
  --border: #2a2a2d;
  --accent: #f5c400;
  --accent-strong: #ffdf3a;
  --accent-dark: #2d2300;
  --danger: #ff4040;
  --radius: 14px;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  color: var(--text);
  background:
    radial-gradient(1200px 800px at 15% -10%, rgba(245, 196, 0, 0.18), transparent 60%),
    radial-gradient(900px 700px at 120% 10%, rgba(245, 196, 0, 0.12), transparent 55%),
    repeating-linear-gradient(135deg, rgba(245, 196, 0, 0.06), rgba(245, 196, 0, 0.06) 12px, transparent 12px, transparent 28px),
    var(--bg);
  line-height: 1.5;
}

.container {
  width: min(980px, calc(100% - 24px));
  margin: 0 auto;
}

.header {
  background: rgba(10, 10, 10, 0.95);
  border-bottom: 1px solid rgba(245, 196, 0, 0.35);
  position: sticky;
  top: 0;
  z-index: 9;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 14px 0 8px;
}

.mascot {
  width: 42px;
  height: 42px;
  display: block;
  border-radius: 50%;
  background: #0b0b0c;
  border: 1px solid rgba(245, 196, 0, 0.4);
  box-shadow: 0 0 10px rgba(245, 196, 0, 0.25);
  image-rendering: auto;
}

.title {
  margin: 0;
  font-size: 1.3rem;
  font-family: "Bebas Neue", sans-serif;
  letter-spacing: 1px;
}

.subtitle {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.tabs {
  display: flex;
  gap: 8px;
  padding: 0 0 12px;
  overflow-x: auto;
}

.tab {
  border: 1px solid rgba(245, 196, 0, 0.35);
  background: #111;
  color: var(--text);
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tab.is-active {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(245, 196, 0, 0.25), rgba(245, 196, 0, 0.08));
  color: var(--accent-strong);
  box-shadow: 0 0 0 1px rgba(245, 196, 0, 0.25), 0 0 10px rgba(245, 196, 0, 0.25);
}

.tab:focus-visible,
input:focus-visible,
select:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 2px;
}

.panel { display: none; padding: 16px 0 24px; }
.panel.is-active { display: block; }

.grid { display: grid; gap: 14px; }
@media (min-width: 860px) {
  .grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 859px) {
  .grid { display: flex; flex-direction: column; }
}

.card {
  background: var(--surface);
  border: 1px solid rgba(245, 196, 0, 0.25);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  animation: rise 0.5s ease;
}

@keyframes rise {
  from { transform: translateY(6px); opacity: 0.7; }
  to { transform: translateY(0); opacity: 1; }
}

.card-title {
  margin: 0 0 12px;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-strong);
}

.form { display: grid; gap: 12px; }
.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

input, select {
  width: 100%;
  border: 1px solid rgba(245, 196, 0, 0.35);
  border-radius: 10px;
  padding: 12px;
  font: inherit;
  color: var(--text);
  background: #0b0b0c;
}

.help { margin: 6px 0 0; font-size: 0.8rem; color: var(--muted); }
.error { margin: 6px 0 0; color: var(--danger); min-height: 1.2em; font-size: 0.85rem; }

.two-up { display: grid; gap: 10px; }
@media (min-width: 520px) {
  .two-up { grid-template-columns: 1fr 1fr; }
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px dashed rgba(245, 196, 0, 0.4);
  background: #121212;
  color: var(--accent-strong);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  cursor: pointer;
}

.chip.is-active {
  background: var(--accent);
  color: #121212;
  border-style: solid;
}

.actions { display: grid; grid-template-columns: 1fr; gap: 8px; }
@media (min-width: 520px) {
  .actions { grid-template-columns: repeat(3, 1fr); }
}

.btn {
  border: 1px solid rgba(245, 196, 0, 0.6);
  background: linear-gradient(180deg, rgba(245, 196, 0, 0.25), rgba(245, 196, 0, 0.05));
  color: var(--accent-strong);
  border-radius: 10px;
  padding: 11px 12px;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-secondary {
  background: #101010;
  color: var(--text);
  border-color: var(--border);
}

.result-block {
  border: 1px solid rgba(245, 196, 0, 0.25);
  border-radius: 12px;
  background: var(--surface-muted);
  padding: 12px;
  margin-bottom: 12px;
}

.result-input { margin: 0; color: var(--muted); font-size: 0.85rem; }

.result-output {
  margin: 8px 0 0;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  line-height: 1.1;
  font-weight: 700;
  color: var(--accent-strong);
  text-shadow: 0 0 12px rgba(245, 196, 0, 0.35);
}

.result-unit { margin: 2px 0 0; font-size: 1rem; font-weight: 600; }

.details {
  border: 1px solid rgba(245, 196, 0, 0.2);
  border-radius: 12px;
  background: #0f0f10;
  margin-top: 10px;
  overflow: hidden;
}

summary {
  cursor: pointer;
  padding: 10px 12px;
  font-weight: 600;
  user-select: none;
  color: var(--accent-strong);
}

.details-body {
  border-top: 1px solid rgba(245, 196, 0, 0.25);
  padding: 10px 12px;
  color: var(--text);
}

.results-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.results-list li {
  border: 1px solid rgba(245, 196, 0, 0.15);
  border-radius: 10px;
  padding: 8px 10px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  background: #0b0b0c;
}

.results-list .unit { color: var(--muted); }

.muted { color: var(--muted); }

.footer { padding: 0 0 24px; }
.footer-row {
  border-top: 1px solid rgba(245, 196, 0, 0.2);
  margin-top: 10px;
  padding-top: 12px;
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%) translateY(12px);
  background: #0f0f10;
  color: var(--accent-strong);
  border: 1px solid rgba(245, 196, 0, 0.35);
  padding: 9px 12px;
  border-radius: 10px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  font-size: 0.85rem;
  box-shadow: var(--shadow);
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.distance-inline {
  display: grid;
  gap: 8px;
}

@media (min-width: 520px) {
  .distance-inline {
    grid-template-columns: 1fr 1fr;
  }
}

.results-list.compact li {
  padding: 6px 10px;
}


.graph-controls {
  display: grid;
  gap: 10px;
}

@media (min-width: 520px) {
  .graph-controls {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: end;
  }
}

.graph-canvas {
  width: 100%;
  height: auto;
  display: block;
  margin-top: 8px;
  border: 1px solid rgba(245, 196, 0, 0.2);
  border-radius: 12px;
  background: #0b0b0c;
}

.card-subsection {
  border: 1px solid rgba(245, 196, 0, 0.2);
  border-radius: 12px;
  padding: 12px;
  background: #111113;
}

.sub-title {
  margin: 0 0 10px;
  font-size: 0.9rem;
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.inline-pair {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 8px;
}

.warning-badge {
  min-height: 1.2em;
  color: #ffcf5a;
}

.code-grid {
  display: grid;
  gap: 8px;
}

@media (min-width: 520px) {
  .code-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.code-chip {
  text-align: left;
}