:root {
  --bg: #f3f1fb;
  --panel: #ffffff;
  --ink: #221d3a;
  --muted: #6a6386;
  --line: #e7e3f5;
  --accent: #6c4cff;       /* playful violet */
  --accent-2: #ff5fa2;     /* pink */
  --accent-3: #18c5b6;     /* teal */
  --accent-dark: #4a2fd6;
  --input-bg: #e6fbef;
  --input-border: #4fd08a;
  --output-bg: linear-gradient(135deg, #4a2fd6, #6c4cff);
  --output-ink: #f3efff;
  --warn: #e0466b;
  --radius: 16px;
  --shadow: 0 2px 6px rgba(60, 40, 120, 0.08), 0 14px 34px rgba(60, 40, 120, 0.10);
  --shadow-lift: 0 6px 14px rgba(60, 40, 120, 0.14), 0 22px 48px rgba(60, 40, 120, 0.16);
  font-synthesis: none;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 500px at 90% -10%, #ffe6f3 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 0%, #e2fff8 0%, transparent 55%),
    var(--bg);
  color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.site-header {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, #4a2fd6, #6c4cff 40%, #ff5fa2 110%);
  background-size: 200% 200%;
  animation: drift 14s ease infinite;
  color: #fff;
  padding: 40px 0 34px;
}
@keyframes drift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.site-header h1 {
  margin: 0 0 8px;
  font-family: "Fredoka", sans-serif;
  font-weight: 700;
  font-size: 2.3rem;
  letter-spacing: -0.01em;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}
.dna-emoji { display: inline-block; animation: wobble 3s ease-in-out infinite; }
@keyframes wobble {
  0%, 100% { transform: rotate(-8deg); }
  50% { transform: rotate(8deg) scale(1.08); }
}
.tagline { margin: 0; opacity: 0.95; max-width: 60ch; font-size: 1.05rem; }

/* Floating DNA bases across the header */
.dna-strip {
  position: absolute; inset: 0; display: flex; gap: 28px;
  justify-content: space-around; align-items: flex-start;
  padding-top: 6px; pointer-events: none; user-select: none;
  font-family: "Fredoka", monospace; font-weight: 700; font-size: 1.1rem;
}
.dna-strip span {
  color: rgba(255, 255, 255, 0.16);
  animation: floaty 6s ease-in-out infinite;
}
.dna-strip span:nth-child(even) { animation-delay: -3s; color: rgba(255, 255, 255, 0.10); }
.dna-strip span:nth-child(3n) { animation-duration: 8s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(14px); }
}

main { padding: 26px 20px 48px; }

/* ---------- Panels ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
  margin: 0 0 22px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.panel:hover { box-shadow: var(--shadow-lift); }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.panel h2 { margin: 0 0 4px; font-family: "Fredoka", sans-serif; font-weight: 600; font-size: 1.25rem; }

.legend { display: flex; gap: 14px; font-size: 0.85rem; color: var(--muted); }
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 14px; height: 14px; border-radius: 4px; display: inline-block; }
.swatch-input { background: var(--input-bg); border: 1px solid var(--input-border); }
.swatch-output { background: linear-gradient(135deg, #4a2fd6, #6c4cff); }

/* ---------- Table ---------- */
.table-scroll { overflow-x: auto; margin-top: 14px; }
table { width: 100%; border-collapse: separate; border-spacing: 0; min-width: 720px; }
thead th {
  font-size: 0.78rem; font-weight: 600; color: var(--muted);
  text-align: center; padding: 6px 8px; border-bottom: 2px solid var(--line);
  vertical-align: bottom; white-space: nowrap;
}
thead th.col-label { text-align: left; }
.unit { font-weight: 400; opacity: 0.75; font-size: 0.72rem; }

tbody td, tfoot td { padding: 6px 8px; border-bottom: 1px solid var(--line); }
tbody tr { animation: popIn 0.28s ease backwards; }
@keyframes popIn {
  from { opacity: 0; transform: translateY(-6px) scale(0.98); }
  to { opacity: 1; transform: none; }
}
tbody tr:last-child td { border-bottom: none; }

td.col-role { text-align: center; }
.role-tag {
  display: inline-block;
  font-size: 0.66rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.04em; color: #fff; background: var(--accent-3);
  padding: 3px 10px; border-radius: 999px; white-space: nowrap;
}
.role-tag.role-vector { background: var(--accent); }

input.cell {
  width: 100%; border: 1.5px solid var(--line); border-radius: 9px;
  padding: 7px 9px; font: inherit; background: #fff; text-align: right;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}
input.cell.label-cell { text-align: left; }
input.cell.in-cell { background: var(--input-bg); border-color: var(--input-border); }
input.cell:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(108, 76, 255, 0.18); transform: translateY(-1px);
}

.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.out-cell {
  background: var(--output-bg); color: var(--output-ink);
  border-radius: 9px; font-weight: 700; font-variant-numeric: tabular-nums;
}
td.out-cell { text-align: right; }
.fold-cell { color: var(--muted); text-align: right; font-variant-numeric: tabular-nums; }

/* celebratory pulse when an output value updates */
.out-cell.bump { animation: bump 0.4s ease; }
@keyframes bump {
  0% { transform: scale(1); }
  35% { transform: scale(1.09); box-shadow: 0 0 0 4px rgba(255, 95, 162, 0.25); }
  100% { transform: scale(1); }
}

.right { text-align: right; color: var(--muted); font-weight: 600; }
tfoot td { border-top: 2px solid var(--line); border-bottom: none; padding-top: 12px; }
.water-row td.out-cell, .total-row td.out-cell { font-size: 0.98rem; }

.btn-del {
  border: none; background: none; color: var(--muted); cursor: pointer;
  font-size: 1rem; line-height: 1; padding: 5px 9px; border-radius: 8px;
  transition: transform 0.12s ease, background 0.12s ease, color 0.12s ease;
}
.btn-del:hover { background: #ffe7ee; color: var(--warn); transform: scale(1.15) rotate(8deg); }
.btn-del:disabled { opacity: 0.25; cursor: not-allowed; }

.row-actions { margin-top: 14px; }

/* ---------- Buttons ---------- */
.btn {
  font: inherit; font-weight: 600; cursor: pointer;
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  color: #fff; border: none;
  padding: 9px 16px; border-radius: 11px;
  box-shadow: 0 3px 8px rgba(108, 76, 255, 0.28);
  transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(108, 76, 255, 0.34); filter: brightness(1.05); }
.btn:active { transform: translateY(0) scale(0.97); }
.btn-quiet {
  background: #fff; color: var(--ink); border: 1.5px solid var(--line);
  box-shadow: none;
}
.btn-quiet:hover { background: #faf8ff; border-color: var(--accent); color: var(--accent-dark); box-shadow: none; }

/* ---------- Params ---------- */
.param-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; margin-top: 14px; }
.param { display: flex; flex-direction: column; gap: 5px; padding: 12px 14px; border-radius: 12px; background: #faf9ff; border: 1px solid var(--line); }
.param > span { font-size: 0.85rem; font-weight: 600; }
.param input { border: 1.5px solid var(--input-border); background: var(--input-bg); border-radius: 9px; padding: 8px 10px; font: inherit; max-width: 140px; }
.param input:focus { outline: none; box-shadow: 0 0 0 3px rgba(79, 208, 138, 0.25); }
.param.readout { background: linear-gradient(135deg, #f3effe, #fdf0f7); }
.param.readout output { font-family: "Fredoka", sans-serif; font-size: 1.25rem; font-weight: 700; color: var(--accent-dark); font-variant-numeric: tabular-nums; }
.param small { color: var(--muted); font-size: 0.76rem; }

/* ---------- Toolbar ---------- */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; margin: 0 0 22px; }
.toolbar .spacer { flex: 1 1 12px; min-width: 8px; }
.preset-name { font: inherit; padding: 8px 11px; border: 1.5px solid var(--line); border-radius: 11px; width: 150px; }
.preset-name:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108, 76, 255, 0.16); }
.preset-select { font: inherit; padding: 8px 9px; border: 1.5px solid var(--line); border-radius: 11px; background: #fff; }

/* ---------- Master mix ---------- */
.mastermix h2 { margin: 0 0 4px; font-family: "Fredoka", sans-serif; font-weight: 600; font-size: 1.25rem; }
.mm-note { margin: 0 0 6px; color: var(--muted); font-size: 0.88rem; }
#mm-table { min-width: 340px; }
#mm-table th.col-label { text-align: left; }
#mm-table td:first-child { font-weight: 500; }

/* ---------- Help / details ---------- */
.help summary { cursor: pointer; list-style: none; }
.help summary::-webkit-details-marker { display: none; }
.help summary h2 { display: inline-block; margin: 0; }
.help summary::before { content: "▸"; color: var(--accent); display: inline-block; margin-right: 6px; transition: transform 0.18s ease; }
.help[open] summary::before { transform: rotate(90deg); }
.help ol { margin: 12px 0 0; padding-left: 22px; }
.help li { margin-bottom: 8px; }

.formula {
  background: linear-gradient(135deg, #f3effe, #fdf0f7);
  border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; margin: 14px 0; font-family: "Cambria Math", Georgia, serif;
  font-size: 1.04rem; overflow-x: auto;
}
.glossary { min-width: 0; margin-top: 8px; }
.glossary td { padding: 5px 10px; border-bottom: 1px solid var(--line); }
.glossary td:first-child { font-family: Georgia, serif; font-weight: 600; width: 70px; white-space: nowrap; color: var(--accent-dark); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 22px 0 36px; color: var(--muted); font-size: 0.9rem; }
.site-footer .cite { margin: 0 0 8px; }
.site-footer a { color: var(--accent-dark); font-weight: 600; text-decoration: none; border-bottom: 2px solid rgba(108, 76, 255, 0.25); }
.site-footer a:hover { border-bottom-color: var(--accent); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(24px);
  background: linear-gradient(135deg, var(--accent-dark), var(--accent-2));
  color: #fff; padding: 11px 20px; border-radius: 12px;
  box-shadow: var(--shadow-lift); opacity: 0; pointer-events: none;
  transition: all 0.25s cubic-bezier(0.18, 0.89, 0.32, 1.28);
  font-size: 0.92rem; font-weight: 600; z-index: 10;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

@media (max-width: 560px) {
  .site-header h1 { font-size: 1.7rem; }
  .toolbar .spacer { flex-basis: 100%; height: 0; }
}