:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --ink: #f8fafc;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --border: rgba(59, 130, 246, 0.18);
}

*,
*::before,
*::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Sarabun", "Sarabun", system-ui, sans-serif;
}

.hero {
  background: linear-gradient(120deg, #1d4ed8, #0ea5e9);
  color: #fff;
  padding: 2rem 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 2rem);
}

.hero p {
  margin: 0.45rem 0 0;
  color: #dbeafe;
}

.wrap {
  width: min(980px, 100% - 2rem);
  margin: 0 auto;
}

.ad-wrap {
  margin-top: 0.9rem;
  margin-bottom: 0.4rem;
}

.main-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 1rem;
  padding: 1rem 0 2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

textarea,
input[type="number"] {
  width: 100%;
  border: 1px solid var(--border);
  background: #253347;
  color: var(--ink);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  font: inherit;
  margin-bottom: 0.9rem;
}

textarea:focus,
input[type="number"]:focus {
  outline: 2px solid rgba(59, 130, 246, 0.35);
  border-color: var(--accent);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 0.58rem 0.9rem;
  cursor: pointer;
  font: inherit;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.gimmick-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: -0.15rem 0 0.9rem;
}

.gimmick-label {
  font-size: 0.82rem;
  color: var(--muted);
}

.chip-btn {
  border: 1px solid var(--border);
  background: rgba(59, 130, 246, 0.12);
  color: #dbeafe;
  border-radius: 999px;
  padding: 0.32rem 0.7rem;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}

.chip-btn:hover {
  border-color: var(--accent);
}

.party-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.party-toggle input {
  accent-color: var(--accent);
}

.hint {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.preview-head h2 {
  margin: 0;
  font-size: 1.02rem;
}

#status {
  color: var(--muted);
  font-size: 0.85rem;
}

.preview-box {
  min-height: 320px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(15, 23, 42, 0.35);
  overflow: auto;
  padding: 1rem;
}

.preview-box img {
  width: auto;
  max-width: 100%;
  height: auto;
  background: #fff;
  padding: 0.5rem;
  border-radius: 10px;
}

.preview-box.party img {
  animation: wobble-in 560ms ease;
}

.spark {
  position: absolute;
  font-size: 1.15rem;
  animation: pop-fade 900ms ease forwards;
  pointer-events: none;
}

.placeholder {
  margin: 0;
  color: var(--muted);
}

@keyframes wobble-in {
  0% { transform: scale(0.88) rotate(-6deg); opacity: 0.2; }
  40% { transform: scale(1.06) rotate(4deg); opacity: 1; }
  70% { transform: scale(0.98) rotate(-2deg); }
  100% { transform: scale(1) rotate(0deg); }
}

@keyframes pop-fade {
  0% { transform: translateY(0) scale(0.8); opacity: 0; }
  15% { opacity: 1; }
  100% { transform: translateY(-24px) scale(1.15); opacity: 0; }
}

@media (max-width: 780px) {
  .main-grid { grid-template-columns: 1fr; }
  .preview-box { min-height: 260px; }
}