@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --gpc-bg:      #f5f6fa;
  --gpc-surface: #ffffff;
  --gpc-surface2:#f0f2f7;
  --gpc-border:  #dde1ea;
  --gpc-accent:  #d97706;
  --gpc-accent2: #2563eb;
  --gpc-text:    #1a1d27;
  --gpc-muted:   #6b7280;
  --gpc-success: #059669;
  --gpc-danger:  #dc2626;
}

/* ── Wrap ────────────────────────────────────────── */
#gpc-app, .gpc-wrap {
  font-family: 'Sarabun', sans-serif;
  color: var(--gpc-text);
  max-width: 1100px;
}
.gpc-wrap { margin-top: 1rem; }

/* ── Tabs ────────────────────────────────────────── */
.gpc-tab-nav {
  display: flex;
  background: var(--gpc-surface);
  border: 1px solid var(--gpc-border);
  border-radius: 10px 10px 0 0;
  padding: 0 1.5rem;
  gap: 0;
}
.gpc-tab-btn {
  padding: 0.9rem 1.4rem;
  background: none;
  border: none;
  color: var(--gpc-muted);
  font-family: 'Sarabun', sans-serif;
  font-size: 0.95rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.gpc-tab-btn.active   { color: var(--gpc-accent); border-bottom-color: var(--gpc-accent); }
.gpc-tab-btn:hover:not(.active) { color: var(--gpc-text); }
.gpc-tab-panel        { display: none; padding: 1.5rem 0; }
.gpc-tab-panel.active { display: block; }

/* ── Page header ─────────────────────────────────── */
.gpc-page-title,
.gpc-page-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gpc-accent);
  margin-bottom: 0.25rem;
}
.gpc-page-header p { color: var(--gpc-muted); font-size: 0.88rem; margin-bottom: 1.25rem; }

/* ── Card ────────────────────────────────────────── */
.gpc-card {
  background: var(--gpc-surface);
  border: 1px solid var(--gpc-border);
  border-radius: 10px;
  padding: 1.4rem;
  margin-bottom: 1.25rem;
}
.gpc-card-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gpc-muted);
  margin-bottom: 1rem;
}

/* ── Form ────────────────────────────────────────── */
.gpc-form-row       { display: grid !important; gap: 1rem !important; margin-bottom: 0.9rem !important; }
.gpc-form-row.col2  { grid-template-columns: 1fr 1fr !important; }
.gpc-form-row.col3  { grid-template-columns: 1fr 1fr 1fr !important; }

#gpc-app label, .gpc-wrap label {
  display: block;
  font-size: 0.8rem;
  color: var(--gpc-muted);
  margin-bottom: 0.35rem;
  font-weight: 600;
}
#gpc-app input, #gpc-app select,
.gpc-wrap input,  .gpc-wrap select {
  width: 100% !important;
  background: var(--gpc-surface2) !important;
  border: 1px solid var(--gpc-border) !important;
  border-radius: 6px !important;
  padding: 0.55rem 0.8rem !important;
  color: var(--gpc-text) !important;
  font-family: 'Sarabun', sans-serif !important;
  font-size: 0.92rem !important;
  outline: none !important;
  transition: border-color 0.2s;
  box-shadow: none !important;
  margin: 0 !important;
  box-sizing: border-box !important;
}
#gpc-app input:focus, #gpc-app select:focus,
.gpc-wrap input:focus, .gpc-wrap select:focus { border-color: var(--gpc-accent2) !important; }
#gpc-app input[type="number"],
.gpc-wrap input[type="number"] { font-family: 'IBM Plex Mono', monospace !important; }

/* ── Buttons ─────────────────────────────────────── */
.gpc-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 1.15rem;
  border-radius: 6px;
  border: none;
  font-family: 'Sarabun', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  line-height: 1.4;
}
.gpc-btn-primary   { background: var(--gpc-accent);  color: #fff; }
.gpc-btn-primary:hover   { background: #b45309; color: #fff; }
.gpc-btn-secondary { background: var(--gpc-surface2); color: var(--gpc-text); border: 1px solid var(--gpc-border); }
.gpc-btn-secondary:hover { border-color: var(--gpc-accent2); color: var(--gpc-accent2); background: var(--gpc-surface2); }
.gpc-btn-success   { background: var(--gpc-success); color: #fff; }
.gpc-btn-success:hover   { background: #047857; color: #fff; }
.gpc-btn-danger    { background: transparent; color: var(--gpc-danger); border: 1px solid var(--gpc-danger); padding: 0.28rem 0.55rem; font-size: 0.78rem; }
.gpc-btn-danger:hover    { background: var(--gpc-danger); color: #fff; }
.gpc-btn-sm        { padding: 0.28rem 0.6rem; font-size: 0.78rem; }

/* ── Table ───────────────────────────────────────── */
#gpc-app table, .gpc-wrap table { width: 100%; border-collapse: collapse; }
#gpc-app th, .gpc-wrap th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gpc-muted);
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--gpc-border);
}
#gpc-app td, .gpc-wrap td {
  padding: 0.7rem;
  border-bottom: 1px solid var(--gpc-border);
  font-size: 0.88rem;
  vertical-align: middle;
}
#gpc-app tr:last-child td, .gpc-wrap tr:last-child td { border-bottom: none; }
#gpc-app tr:hover td, .gpc-wrap tr:hover td { background: #fafbfc; }
.gpc-mono { font-family: 'IBM Plex Mono', monospace; font-size: 0.82rem; }

/* ── Product selector ────────────────────────────── */
.gpc-product-selector { display: grid; gap: 0.7rem; }
.gpc-product-item {
  display: grid;
  grid-template-columns: auto 1fr auto auto auto auto;
  align-items: center;
  gap: 1rem;
  background: var(--gpc-surface2);
  border: 1px solid var(--gpc-border);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  transition: border-color 0.2s;
}
.gpc-product-item.selected { border-color: var(--gpc-accent); background: #fffbf0; }
.gpc-product-item input[type="checkbox"] { width: 17px; height: 17px; accent-color: var(--gpc-accent); cursor: pointer; }
.gpc-product-name { font-weight: 600; font-size: 0.93rem; }
.gpc-product-meta { font-size: 0.76rem; color: var(--gpc-muted); margin-top: 0.15rem; }
.gpc-qty-input    { width: 78px; text-align: center; }

/* ── Summary ─────────────────────────────────────── */
.gpc-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}
.gpc-summary-box {
  background: var(--gpc-surface);
  border: 1px solid var(--gpc-border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}
.gpc-summary-box .value {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gpc-accent);
}
.gpc-summary-box .label { font-size: 0.76rem; color: var(--gpc-muted); margin-top: 0.2rem; }

/* ── Misc helpers ────────────────────────────────── */
.gpc-flex-end     { display: flex; justify-content: flex-end; gap: 0.6rem; flex-wrap: wrap; }
.gpc-flex-between { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.gpc-hint         { font-size: 0.78rem; color: var(--gpc-muted); }

.gpc-so-badge {
  display: inline-block;
  background: rgba(217,119,6,0.1);
  color: var(--gpc-accent);
  border: 1px solid rgba(217,119,6,0.3);
  border-radius: 4px;
  padding: 0.12rem 0.55rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  font-weight: 600;
}
.gpc-tag {
  display: inline-block;
  background: rgba(37,99,235,0.1);
  color: var(--gpc-accent2);
  border-radius: 4px;
  padding: 0.1rem 0.45rem;
  font-size: 0.73rem;
  font-weight: 600;
}

.gpc-alert {
  padding: 0.65rem 0.9rem;
  border-radius: 6px;
  font-size: 0.86rem;
  margin-bottom: 0.75rem;
}
.gpc-alert-success { background: rgba(5,150,105,0.08); border: 1px solid rgba(5,150,105,0.3); color: var(--gpc-success); }
.gpc-alert-danger  { background: rgba(220,38,38,0.08);  border: 1px solid rgba(220,38,38,0.3);  color: var(--gpc-danger); }
.gpc-alert-warn    { background: rgba(217,119,6,0.08);  border: 1px solid rgba(217,119,6,0.3);  color: var(--gpc-accent); }

.gpc-empty { text-align: center; padding: 2.5rem; color: var(--gpc-muted); font-size: 0.88rem; }

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 768px) {
  .gpc-form-row.col2,
  .gpc-form-row.col3 { grid-template-columns: 1fr; }
  .gpc-product-item  { grid-template-columns: auto 1fr; }
  .gpc-product-item > div:nth-child(n+3) { display: none; }
  .gpc-summary-grid  { grid-template-columns: 1fr; }
}