/* Gravel & Aggregate Calculator — elevated UI, sibling to the soil tool.
   Shared warm-cream base, stone/slate accent instead of green. Scoped to
   .gac-wrap. Signature: the coverage preview whose depth fills as you type. */

.gac-wrap {
  --g-stone: #363b40;
  --g-stone-soft: #565d63;
  --g-slate: #45677a;
  --g-slate-deep: #33505f;
  --g-slate-bright: #6a92a2;
  --g-cream: #f7f2e9;
  --g-cream-deep: #eee7d8;
  --g-line: #ddd3c1;
  --g-ink: #292825;
  --g-ink-soft: #6d675b;
  --g-white: #fffdf9;
  --g-r: 16px;
  --g-ease: cubic-bezier(.22,.61,.36,1);
  --g-spring: cubic-bezier(.34,1.56,.64,1);
  --g-sh-sm: 0 1px 2px rgba(41,40,37,.06);
  --g-sh-lg: 0 18px 40px -12px rgba(41,40,37,.2), 0 4px 12px rgba(41,40,37,.08);

  max-width: 940px;
  margin: 2rem auto;
  background: var(--g-cream);
  border: 1px solid var(--g-line);
  border-radius: var(--g-r);
  overflow: hidden;
  color: var(--g-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  box-shadow: var(--g-sh-lg);
  -webkit-font-smoothing: antialiased;
}
.gac-wrap *, .gac-wrap *::before, .gac-wrap *::after { box-sizing: border-box; }
.gac-wrap :focus-visible { outline: 2px solid var(--g-slate); outline-offset: 2px; }

/* Header */
.gac-header { padding: 2rem 2rem 1.6rem; background: radial-gradient(130% 150% at 100% -10%, rgba(69,103,122,.14), transparent 55%), linear-gradient(180deg, var(--g-white), var(--g-cream)); border-bottom: 1px solid var(--g-line); }
.gac-eyebrow { display: inline-flex; align-items: center; gap: .45rem; font-size: .7rem; letter-spacing: .18em; text-transform: uppercase; color: var(--g-slate-deep); font-weight: 800; margin-bottom: .6rem; }
.gac-eyebrow::before { content: ""; width: 16px; height: 2px; background: var(--g-slate); border-radius: 2px; }
.gac-title { margin: 0 0 .45rem; font-size: 2rem; line-height: 1.08; font-weight: 800; color: var(--g-stone); letter-spacing: -.02em; }
.gac-sub { margin: 0; color: var(--g-ink-soft); font-size: 1.02rem; max-width: 50ch; }

/* Region bar */
.gac-region-bar { display: flex; align-items: center; gap: .85rem; flex-wrap: wrap; padding: 1rem 2rem; background: var(--g-cream-deep); border-bottom: 1px solid var(--g-line); }
.gac-region-label { font-size: .7rem; letter-spacing: .13em; text-transform: uppercase; color: var(--g-ink-soft); font-weight: 800; }
.gac-region-pills { display: flex; gap: .4rem; flex-wrap: wrap; }
.gac-pill { border: 1px solid var(--g-line); background: var(--g-white); color: var(--g-ink-soft); padding: .42rem .85rem; border-radius: 999px; font-size: .82rem; font-weight: 700; cursor: pointer; transition: transform .15s var(--g-spring), background .15s var(--g-ease), color .15s var(--g-ease), border-color .15s var(--g-ease), box-shadow .15s var(--g-ease); }
.gac-pill:hover { border-color: var(--g-slate-bright); color: var(--g-slate-deep); transform: translateY(-1px); box-shadow: var(--g-sh-sm); }
.gac-pill.is-active { background: var(--g-slate-deep); color: #fff; border-color: var(--g-slate-deep); box-shadow: 0 3px 10px -2px rgba(51,80,95,.5); }

/* Body */
.gac-body { display: grid; grid-template-columns: 1fr 1.05fr; }
.gac-inputs { padding: 1.7rem 2rem; border-right: 1px solid var(--g-line); }
.gac-output { padding: 1.7rem 2rem; background: linear-gradient(180deg, var(--g-white), #fffefb); }

/* Material select gets emphasis — it's the USP */
.gac-inputs .gac-field-full:first-child select { border-color: var(--g-slate-bright); box-shadow: 0 0 0 3px rgba(69,103,122,.08); }

/* Shape toggle */
.gac-shape-toggle { display: inline-flex; padding: .28rem; background: var(--g-cream-deep); border-radius: 12px; margin: 0 0 1.2rem; gap: .2rem; }
.gac-shape-btn { border: 0; background: transparent; padding: .48rem 1.05rem; border-radius: 9px; font-size: .88rem; font-weight: 700; color: var(--g-ink-soft); cursor: pointer; transition: all .18s var(--g-ease); }
.gac-shape-btn.is-active { background: var(--g-white); color: var(--g-stone); box-shadow: var(--g-sh-sm); }

/* Unit switch */
.gac-unit-row { display: flex; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: 1.2rem; flex-wrap: wrap; }
.gac-unit-label { font-size: .8rem; color: var(--g-ink-soft); font-weight: 700; }
.gac-unit-switch { display: inline-flex; border: 1px solid var(--g-line); border-radius: 10px; overflow: hidden; background: var(--g-white); }
.gac-unit-opt { border: 0; background: transparent; padding: .42rem .72rem; font-size: .82rem; font-weight: 700; color: var(--g-ink-soft); cursor: pointer; border-right: 1px solid var(--g-line); transition: all .14s var(--g-ease); }
.gac-unit-opt:last-child { border-right: 0; }
.gac-unit-opt:hover { background: var(--g-cream); }
.gac-unit-opt.is-active { background: var(--g-slate); color: #fff; }

/* Fields */
.gac-field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; margin-bottom: 1.05rem; }
.gac-field { display: flex; flex-direction: column; gap: .38rem; }
.gac-field-full { grid-column: 1 / -1; margin-bottom: 1.05rem; }
.gac-field > span { font-size: .82rem; font-weight: 700; color: var(--g-stone-soft); }
.gac-field input, .gac-field select { width: 100%; padding: .68rem .8rem; border: 1px solid var(--g-line); border-radius: 10px; font-size: 1rem; background: var(--g-white); color: var(--g-ink); font-weight: 600; transition: border-color .15s var(--g-ease), box-shadow .15s var(--g-ease); -moz-appearance: textfield; }
.gac-field input:hover, .gac-field select:hover { border-color: var(--g-slate-bright); }
.gac-field input:focus, .gac-field select:focus { outline: none; border-color: var(--g-slate); box-shadow: 0 0 0 3px rgba(69,103,122,.16); }
.gac-hint { font-size: .75rem; color: var(--g-ink-soft); line-height: 1.45; }

/* Depth row */
.gac-depth-row { display: flex; gap: .5rem; align-items: stretch; }
.gac-depth-row input { flex: 1; }
.gac-depth-unit { display: inline-flex; border: 1px solid var(--g-line); border-radius: 10px; overflow: hidden; background: var(--g-white); }
.gac-dunit { border: 0; background: transparent; padding: 0 .65rem; font-size: .8rem; font-weight: 700; color: var(--g-ink-soft); cursor: pointer; border-right: 1px solid var(--g-line); transition: all .14s var(--g-ease); }
.gac-dunit:last-child { border-right: 0; }
.gac-dunit:hover { background: var(--g-cream); }
.gac-dunit.is-active { background: var(--g-slate); color: #fff; }

.gac-adv { border-top: 1px solid var(--g-line); padding-top: 1rem; margin-top: .4rem; }
.gac-adv summary { font-size: .84rem; font-weight: 700; color: var(--g-slate-deep); cursor: pointer; list-style-position: inside; }
.gac-adv-inner { padding-top: 1rem; }

/* Signature visual: top-down coverage with depth fill */
.gac-visual { margin-bottom: 1.5rem; }
.gac-area {
  position: relative; height: 200px; border-radius: 14px; overflow: hidden;
  background:
    radial-gradient(circle at 28% 32%, rgba(0,0,0,.06) 1.5px, transparent 2px) 0 0/13px 13px,
    radial-gradient(circle at 68% 62%, rgba(0,0,0,.05) 1.5px, transparent 2px) 5px 5px/17px 17px,
    radial-gradient(circle at 50% 80%, rgba(255,255,255,.05) 1px, transparent 2px) 2px 2px/11px 11px,
    linear-gradient(135deg, #8f948a 0%, #72776d 45%, #585c53 100%);
  border: 1px solid var(--g-line);
  box-shadow: inset 0 2px 8px rgba(41,40,37,.1);
  display: flex; align-items: center; justify-content: center;
}
.gac-area-grid { position: absolute; inset: 12px; border: 1.5px dashed rgba(255,255,255,.5); border-radius: 7px; }
.gac-area-label { position: relative; z-index: 2; background: rgba(41,40,37,.74); color: #fff; font-size: .82rem; font-weight: 800; padding: .32rem .75rem; border-radius: 7px; font-variant-numeric: tabular-nums; box-shadow: var(--g-sh-sm); }
.gac-area-depth { position: absolute; left: 0; right: 0; bottom: 0; background: linear-gradient(180deg, rgba(69,103,122,0), rgba(51,80,95,.6)); display: flex; align-items: flex-end; justify-content: flex-start; transition: height .5s var(--g-ease); }
.gac-area-depth span { background: var(--g-slate-deep); color: #fff; font-size: .68rem; font-weight: 800; padding: .14rem .45rem; border-radius: 6px; margin: 0 0 9px 11px; box-shadow: var(--g-sh-sm); }
.gac-visual-caption { text-align: center; font-size: .7rem; color: var(--g-ink-soft); margin-top: .55rem; letter-spacing: .1em; text-transform: uppercase; font-weight: 700; }

/* Results hero */
.gac-result-primary { display: grid; grid-template-columns: 1fr 1.15fr; gap: .85rem; margin-bottom: 1.1rem; }
.gac-result-tonnes, .gac-result-bags { border-radius: 14px; padding: 1.1rem; text-align: center; position: relative; overflow: hidden; }
.gac-result-tonnes { background: var(--g-cream); border: 1px solid var(--g-line); }
.gac-result-bags { background: linear-gradient(158deg, #40667a 0%, #33505f 100%); border: 1px solid var(--g-slate-deep); box-shadow: 0 10px 26px -8px rgba(51,80,95,.55); }
.gac-result-bags::after { content: ""; position: absolute; top: -40%; right: -20%; width: 120px; height: 120px; background: radial-gradient(circle, rgba(255,255,255,.16), transparent 70%); pointer-events: none; }
.gac-big, .gac-bags-num { font-variant-numeric: tabular-nums; display: block; line-height: 1; transition: transform .2s var(--g-spring); }
.gac-big { font-size: 2.1rem; font-weight: 800; color: var(--g-stone); }
.gac-big-unit { font-size: .78rem; color: var(--g-ink-soft); font-weight: 700; }
.gac-bags-num { font-size: 2.5rem; font-weight: 800; color: #fff; }
.gac-bags-label { font-size: .82rem; color: rgba(255,255,255,.9); font-weight: 700; }
.gac-pulse { animation: gac-pop .32s var(--g-spring); }
@keyframes gac-pop { 0% { transform: scale(1); } 40% { transform: scale(1.11); } 100% { transform: scale(1); } }

.gac-result-secondary { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.1rem; }
.gac-chip { font-size: .78rem; background: var(--g-cream-deep); border: 1px solid var(--g-line); padding: .38rem .7rem; border-radius: 999px; color: var(--g-stone-soft); font-weight: 700; font-variant-numeric: tabular-nums; }
.gac-chip strong { color: var(--g-stone); }

.gac-shopping { background: var(--g-cream); border: 1px dashed var(--g-slate-bright); border-radius: 12px; padding: 1rem 1.1rem; margin-bottom: 1rem; font-size: .88rem; }
.gac-shopping h4 { margin: 0 0 .55rem; font-size: .74rem; color: var(--g-slate-deep); text-transform: uppercase; letter-spacing: .1em; font-weight: 800; }
.gac-shopping ul { margin: 0; padding-left: 1.15rem; color: var(--g-stone-soft); }
.gac-shopping li { margin: .28rem 0; }

.gac-copy { width: 100%; border: 0; background: var(--g-stone); color: #fff; font-weight: 800; padding: .82rem; border-radius: 11px; cursor: pointer; font-size: .92rem; transition: transform .12s var(--g-ease), background .15s var(--g-ease); }
.gac-copy:hover { background: var(--g-stone-soft); }
.gac-copy:active { transform: scale(.985); }
.gac-copy.is-copied { background: var(--g-slate); }

/* Disclaimer */
.gac-disclaimer { display: flex; gap: .7rem; align-items: flex-start; margin: 0; padding: 1rem 2rem; background: #fbf6ec; border-top: 1px solid var(--g-line); font-size: .8rem; color: var(--g-ink-soft); line-height: 1.5; }
.gac-disclaimer svg { flex-shrink: 0; margin-top: 1px; }
.gac-disclaimer strong { color: var(--g-stone-soft); }

.gac-foot { margin: 0; padding: .85rem 2rem; font-size: .74rem; color: var(--g-ink-soft); background: var(--g-cream-deep); border-top: 1px solid var(--g-line); }

.gac-hidden { display: none !important; }

@media (max-width: 720px) {
  .gac-body { grid-template-columns: 1fr; }
  .gac-inputs { border-right: 0; border-bottom: 1px solid var(--g-line); }
  .gac-header, .gac-region-bar, .gac-inputs, .gac-output, .gac-disclaimer, .gac-foot { padding-left: 1.3rem; padding-right: 1.3rem; }
  .gac-title { font-size: 1.55rem; }
  .gac-big { font-size: 1.7rem; } .gac-bags-num { font-size: 2.1rem; }
  .gac-output { order: -1; }
}
@media (prefers-reduced-motion: reduce) {
  .gac-area-depth, .gac-big, .gac-bags-num, .gac-pill, .gac-copy { transition: none; }
  .gac-pulse { animation: none; }
}