:root {
  color-scheme: dark;
  --dirt-dark: #4a2f1c;
  --dirt: #6b4527;
  --dirt-light: #8a5a36;
  --cave-dark: #1c1a17;
  --cave: #2b2722;
  --cave-mid: #3a352e;
  --cave-light: #55503f;
  --rock-dark: #4a4a4a;
  --rock: #6e6e6e;
  --rock-light: #9a9a9a;
  --lava-dark: #8a1a0c;
  --lava: #d83920;
  --lava-glow: #ff6a2c;
  --moss: #4a6b2f;
  --moss-light: #7a9a4a;
  --bone: #e8dcc4;
  --ink: #f4ecd8;
  --ink-muted: #b8ad94;
  --line: #2a2620;
  --shadow: 0 2px 0 #00000040, 0 6px 18px #00000060;
  --pixel-font: "VT323", "Courier New", monospace;
  --display-font: "Press Start 2P", monospace;
  --body-font: "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

[hidden] { display: none !important; }

html, body {
  height: 100%;
  background: var(--cave-dark);
  color: var(--ink);
  font-family: var(--body-font);
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-image:
    radial-gradient(circle at 20% 30%, #3a352e55 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, #3a352e55 0%, transparent 40%),
    repeating-linear-gradient(45deg, #1c1a17 0 8px, #15130f 8px 16px),
    repeating-linear-gradient(-45deg, transparent 0 12px, #0a0907 12px 24px);
  background-attachment: fixed;
}

/* --- layout ---- */
.app {
  display: grid;
  grid-template-rows: auto 1fr;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "header"
    "main";
  min-height: 100vh;
}

/* --- header --- */
header {
  grid-area: header;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 18px;
  background: linear-gradient(180deg, var(--cave-mid) 0%, var(--cave) 100%);
  border-bottom: 3px solid var(--line);
  box-shadow: 0 4px 0 #00000040;
  z-index: 5;
}

.brand { display: flex; align-items: baseline; gap: 10px; white-space: nowrap; }
.brand h1 {
  font-family: var(--display-font);
  font-size: 14px;
  letter-spacing: 1px;
  color: var(--bone);
  text-shadow: 2px 2px 0 #000;
}
.brand-sub {
  font-family: var(--pixel-font);
  font-size: 17px;
  color: var(--lava-glow);
  letter-spacing: 1px;
}

.header-title { flex: 1; min-width: 0; }

.header-actions { display: flex; align-items: center; gap: 10px; }

.back-link {
  font-family: var(--pixel-font);
  font-size: 16px;
  color: var(--ink-muted);
  text-decoration: none;
  border: 2px solid var(--cave-light);
  padding: 6px 10px;
  transition: color 120ms, border-color 120ms;
}
.back-link:hover { color: var(--bone); border-color: var(--lava); }

:focus-visible { outline: 2px solid var(--lava); outline-offset: 2px; }

/* --- center column --- */
.center {
  grid-area: main;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 20px;
  min-height: calc(100vh - 64px);
}

.calc-card {
  width: 100%;
  max-width: 460px;
  padding: 26px 28px;
  background: var(--cave);
  border: 2px solid var(--line);
  border-bottom: 4px solid var(--line);
  box-shadow: var(--shadow);
  display: grid;
  gap: 10px;
}

.field-label {
  font-family: var(--display-font);
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-top: 8px;
}
.field-label:first-child { margin-top: 0; }

/* --- searchable picker --- */
.gc-picker { position: relative; }

.gc-picker-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  background: var(--cave-dark);
  border: 2px solid var(--cave-light);
  color: var(--ink);
  font-family: var(--pixel-font);
  font-size: 16px;
  line-height: 1.15;
  text-align: left;
  cursor: pointer;
  transition: border-color 150ms;
}
.gc-picker-trigger:hover { border-color: #6b6550; }
.gc-picker.open .gc-picker-trigger { border-color: var(--lava); }

.gc-trigger-value {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.gc-trigger-caret {
  flex: none;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--ink-muted);
  transition: transform 150ms;
}
.gc-picker.open .gc-trigger-caret { transform: rotate(180deg); }

.gc-picker-pop {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  width: 100%;
  z-index: 30;
  display: flex;
  flex-direction: column;
  background: var(--cave);
  border: 2px solid var(--cave-light);
  box-shadow: var(--shadow);
}

.gc-search {
  margin: 8px 8px 4px;
  padding: 7px 10px;
  background: var(--cave-dark);
  border: 2px solid var(--cave-light);
  color: var(--ink);
  font-family: var(--pixel-font);
  font-size: 16px;
  outline: none;
  transition: border-color 150ms;
}
.gc-search:focus { border-color: var(--lava); }

.gc-search-empty {
  padding: 10px 12px;
  font-family: var(--pixel-font);
  font-size: 16px;
  color: var(--ink-muted);
}

.gc-picker-list {
  list-style: none;
  margin: 0 8px 8px;
  padding: 0;
  max-height: min(46vh, 320px);
  overflow-y: auto;
}

.gc-optgroup-label {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 6px 10px 4px;
  background: var(--cave);
  font-family: var(--display-font);
  font-size: 8px;
  letter-spacing: 1px;
  color: var(--lava-glow);
  text-transform: uppercase;
}

.gc-opt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 10px;
  font-family: var(--pixel-font);
  font-size: 16px;
  color: var(--ink);
  cursor: pointer;
  border-left: 3px solid transparent;
}
.gc-opt:hover { background: var(--cave-mid); }
.gc-opt.active { background: var(--cave-mid); border-left-color: var(--lava); }
.gc-opt.selected { color: var(--lava-glow); }

.gc-opt-badge {
  flex: none;
  font-family: var(--body-font);
  font-size: 10px;
  letter-spacing: .4px;
  color: var(--ink-muted);
  opacity: .85;
}

/* --- quantity --- */
input#gc-qty {
  width: 100%;
  padding: 8px 12px;
  background: var(--cave-dark);
  border: 2px solid var(--cave-light);
  color: var(--ink);
  font-family: var(--pixel-font);
  font-size: 16px;
  outline: none;
  transition: border-color 150ms;
}
input#gc-qty:focus { border-color: var(--lava); }

/* --- main result --- */
.calc-card .result-card {
  width: 100%;
  padding: 20px 0 8px;
  margin-top: 12px;
  background: transparent;
  border: none;
  border-top: 2px dashed var(--cave-light);
  border-bottom: none;
  box-shadow: none;
  text-align: center;
  user-select: text;
}

.result-label {
  font-family: var(--display-font);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--ink-muted);
}

.result-line {
  font-family: var(--display-font);
  font-size: clamp(20px, 3.5vw, 34px);
  color: var(--lava-glow);
  text-shadow: 3px 3px 0 #000;
  letter-spacing: 1px;
  margin-top: 14px;
}

.result-sub {
  font-family: var(--pixel-font);
  font-size: 17px;
  color: var(--ink-muted);
  margin-top: 8px;
}

.result-empty {
  font-family: var(--pixel-font);
  font-size: 18px;
  color: var(--ink-muted);
  opacity: .7;
}


/* ─── Discord credit card ──────────────────────────── */
.discord-card {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: linear-gradient(180deg, var(--cave) 0%, var(--cave-dark) 100%);
  border: 2px solid var(--cave-light);
  color: var(--ink-muted);
  font-family: var(--pixel-font);
  font-size: 17px;
  text-decoration: none;
  margin-top: 14px;
  transition: border-color 150ms, color 150ms, transform 100ms;
  box-shadow: 0 3px 0 #00000040;
}

.discord-card:hover {
  border-color: #5865F2;
  color: var(--bone);
  transform: translateY(-2px);
  box-shadow: 0 5px 0 #00000040;
}

.discord-card:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 #00000040;
}

.discord-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  transition: color 150ms;
}

.discord-card:hover .discord-icon {
  color: #5865F2;
}


/* ─── Discord header button ──────────────────────── */
.btn-icon { display: none; }
.discord-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--cave-dark);
  border: 2px solid var(--cave-light);
  color: var(--ink-muted);
  font-family: var(--pixel-font);
  font-size: 15px;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: color 150ms, border-color 150ms, background 150ms;
}
.discord-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: color 150ms;
}
.discord-btn:hover {
  color: var(--bone);
  border-color: #5865F2;
  background: var(--cave-mid);
}
.discord-btn:hover svg { color: #5865F2; }


/* ─── Mobile ─────────────────────────────────────── */
@media (max-width: 640px) {
  header { flex-wrap: wrap; row-gap: 10px; }
  .header-title { flex-basis: 100%; order: 3; }
  .header-actions { flex-wrap: wrap; row-gap: 8px; }
  /* Mobile: header icon-only */
  .btn .btn-icon, .back-link .btn-icon, .discord-btn svg { display: inline-block; }
  .btn-label { display: none; }
  .discord-btn { padding: 8px; }
  .back-link { padding: 8px; }
}