:root {
  --bg: #fff8ef;
  --card: #ffffff;
  --text: #24160f;
  --muted: #7a6658;
  --line: #efd9c0;
  --accent: #e24a1a;
  --accent-2: #ffcc66;
  --shadow: 0 20px 60px rgba(117, 59, 21, 0.12);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #fff2cf, var(--bg) 42%, #fff 100%);
  color: var(--text);
}

.site-header, main, footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 52px; height: 52px; border-radius: 18px;
  display: grid; place-items: center;
  background: var(--text); color: #fff; font-weight: 900;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .1em;
}

h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: 28px; }
h2 { font-size: clamp(28px, 5vw, 56px); line-height: 1.02; letter-spacing: -0.04em; }
h3 { margin-bottom: 8px; }
p { color: var(--muted); line-height: 1.6; }

button, .zalo-btn {
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 12px 30px rgba(226, 74, 26, .24);
}

.hero {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 28px;
  align-items: center;
  padding: 28px;
  background: linear-gradient(135deg, #fff, #fff3d8);
  border: 1px solid var(--line);
  border-radius: 34px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-image {
  min-height: 320px;
  border-radius: 28px;
  background: url('/assets/deal-placeholder.svg') center/cover no-repeat;
  border: 1px solid var(--line);
}

.panel, .zalo-panel {
  margin-top: 26px;
  padding: 28px;
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 30px;
  box-shadow: var(--shadow);
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 18px;
}
.section-head h2 { font-size: clamp(24px, 4vw, 40px); max-width: 720px; }

.mix-form {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  align-items: end;
}
label { display: grid; gap: 8px; font-weight: 800; }
select {
  height: 48px;
  border-radius: 16px;
  border: 1px solid var(--line);
  padding: 0 14px;
  background: #fff;
  font: inherit;
}

.combo-result {
  margin-top: 20px;
  display: grid;
  gap: 14px;
}
.combo-card, .product-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  overflow: hidden;
}
.combo-card { padding: 18px; }
.combo-items { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.chip {
  padding: 9px 12px;
  border-radius: 999px;
  background: #fff3d8;
  color: #6d3b13;
  font-weight: 800;
  font-size: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.product-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
  background: #fff3d8;
}
.product-card .body { padding: 14px; }
.price { color: var(--accent); font-size: 20px; font-weight: 900; }
.meta { color: var(--muted); font-size: 13px; }

.zalo-panel {
  background: var(--text);
  color: #fff;
}
.zalo-panel p { color: #f3dfcb; }
.zalo-panel code { color: var(--accent-2); }

footer { padding: 28px 0 40px; text-align: center; }

@media (max-width: 840px) {
  .site-header { align-items: flex-start; gap: 12px; }
  .hero, .mix-form { grid-template-columns: 1fr; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero-image { min-height: 220px; }
}

@media (max-width: 520px) {
  .site-header { flex-direction: column; }
  .grid { grid-template-columns: 1fr; }
  .panel, .zalo-panel, .hero { padding: 20px; border-radius: 24px; }
}