:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #22263a;
  --border: #2e3250;
  --accent: #f97316;
  --accent2: #fb923c;
  --green: #22c55e;
  --red: #ef4444;
  --blue: #60a5fa;
  --text: #f1f5f9;
  --text2: #94a3b8;
  --text3: #64748b;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

/* ── Header ── */
.tool-header {
  background: linear-gradient(135deg, #1a1d27 0%, #0f1117 100%);
  border-bottom: 1px solid var(--border);
  padding: 28px 24px 24px;
  text-align: center;
  position: relative;
}
.tool-header::before {
  content: '';
  position: absolute;
  top: -60px; left: 50%;
  transform: translateX(-50%);
  width: 300px; height: 200px;
  background: radial-gradient(ellipse, rgba(249,115,22,0.18) 0%, transparent 70%);
  pointer-events: none;
}
.header-emoji { font-size: 2.4rem; margin-bottom: 6px; display: block; }
.tool-header h1 {
  font-size: 1.7rem; font-weight: 700;
  background: linear-gradient(90deg, #f97316, #fbbf24);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}
.tool-header p { color: var(--text3); font-size: 0.82rem; margin-top: 4px; font-family: "Noto Sans Thai", sans-serif; }

/* ── Container ── */
.tool-container { max-width: 680px; margin: 0 auto; padding: 0 16px; }

/* ── Section card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 20px;
}
.card-title {
  font-size: 0.78rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1.2px; color: var(--accent);
  margin-bottom: 16px; display: flex; align-items: center; gap: 8px;
}
.card-title .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); display: inline-block;
}

/* ── Person rows ── */
#person-list { display: flex; flex-direction: column; gap: 10px; }

.person-row {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 14px 14px 16px;
  display: grid;
  grid-template-columns: 1fr 130px 36px;
  gap: 10px;
  align-items: center;
  animation: slideIn 0.25s ease;
  position: relative;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.person-row::before {
  content: attr(data-num);
  position: absolute;
  left: -10px; top: 50%; transform: translateY(-50%);
  background: var(--accent);
  color: #fff; font-size: 0.65rem; font-weight: 700;
  width: 20px; height: 20px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}

input[type="text"], input[type="number"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: "Noto Sans Thai", sans-serif;
  font-size: 0.88rem;
  padding: 9px 12px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.15);
}
input::placeholder { color: var(--text3); }

.price-wrap { position: relative; }
.price-wrap input { padding-left: 28px; }
.price-wrap::before {
  content: '฿';
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  color: var(--text3); font-size: 0.85rem; pointer-events: none;
  z-index: 1;
}

.btn-remove {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text3);
  cursor: pointer;
  font-size: 1rem;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.btn-remove:hover { background: rgba(239,68,68,0.12); border-color: var(--red); color: var(--red); }

/* ── Add person button ── */
.btn-add {
  width: 100%;
  margin-top: 12px;
  background: transparent;
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  color: var(--text3);
  font-family: "Noto Sans Thai", sans-serif;
  font-size: 0.85rem;
  padding: 12px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-add:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(249,115,22,0.05);
}

/* ── Extras ── */
.extras-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.field-group label {
  display: block;
  font-size: 0.75rem; color: var(--text3);
  margin-bottom: 6px; font-weight: 500;
}

/* ── Calculate button ── */
.btn-calc {
  width: 100%;
  margin-top: 20px;
  background: linear-gradient(135deg, #f97316, #ea580c);
  border: none;
  border-radius: 12px;
  color: #fff;
  font-family: "Noto Sans Thai", sans-serif;
  font-size: 1rem;
  font-weight: 600;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 20px rgba(249,115,22,0.35);
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-calc:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(249,115,22,0.5);
}
.btn-calc:active { transform: translateY(0); }

/* ── Result section ── */
#result { display: none; }

.summary-banner {
  background: linear-gradient(135deg, rgba(34,197,94,0.12), rgba(34,197,94,0.04));
  border: 1px solid rgba(34,197,94,0.25);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 20px;
  text-align: center;
}
.summary-banner .label { font-size: 0.78rem; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; }
.summary-banner .total-amount {
  font-size: 2.4rem; font-weight: 700;
  color: var(--green);
  letter-spacing: -1px;
  line-height: 1.1;
  margin: 6px 0 2px;
}
.summary-banner .sub { font-size: 0.8rem; color: var(--text2); }

.breakdown-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}
.breakdown-row:last-child { border-bottom: none; }
.breakdown-row .br-label { color: var(--text2); }
.breakdown-row .br-val { font-weight: 600; }
.br-val.positive { color: var(--green); }
.br-val.negative { color: var(--red); }
.br-val.neutral  { color: var(--blue); }

/* Per-person result cards */
.person-results { display: flex; flex-direction: column; gap: 10px; margin-top: 4px; }

.person-result-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.prc-left .prc-name { font-weight: 600; font-size: 0.95rem; }
.prc-left .prc-food { font-size: 0.78rem; color: var(--text3); margin-top: 2px; }

.prc-right { text-align: right; }
.prc-right .prc-pay {
  font-size: 1.25rem; font-weight: 700;
  color: var(--accent);
}
.prc-right .prc-detail { font-size: 0.72rem; color: var(--text3); margin-top: 2px; }

.tag {
  display: inline-block;
  font-size: 0.68rem; font-weight: 600;
  padding: 2px 7px; border-radius: 20px;
  margin-left: 6px;
  vertical-align: middle;
}
.tag-split { background: rgba(96,165,250,0.15); color: var(--blue); }
.tag-extra { background: rgba(249,115,22,0.15); color: var(--accent); }

/* Reset button */
.btn-reset {
  width: 100%; margin-top: 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text3);
  font-family: "Noto Sans Thai", sans-serif;
  font-size: 0.85rem; padding: 12px;
  cursor: pointer; transition: all 0.2s;
}
.btn-reset:hover { border-color: var(--text2); color: var(--text); }

/* ── Responsive ── */
@media (max-width: 480px) {
  .person-row { grid-template-columns: 1fr 110px 32px; }
  .extras-grid { grid-template-columns: 1fr; }
  .summary-banner .total-amount { font-size: 2rem; }
}

/* ── Error shake ── */
@keyframes shake {
  0%,100%{ transform: translateX(0); }
  20%{ transform: translateX(-6px); }
  40%{ transform: translateX(6px); }
  60%{ transform: translateX(-4px); }
  80%{ transform: translateX(4px); }
}
.shake { animation: shake 0.4s ease; }
input.error { border-color: var(--red) !important; }