* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --negro: #0d0d0d;
  --carbon: #1a1a1a;
  --humo: #2a2a2a;
  --gris: #888;
  --crema: #f5f0e8;
  --naranja: #ff6b2b;
  --naranja-oscuro: #e55a1f;
  --naranja-glow: rgba(255, 107, 43, 0.35);
  --verde-wa: #25d366;
  --verde-wa-oscuro: #1da855;
  --blanco: #fff;
  --radius: 16px;
}

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--negro);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 0;
  color: var(--blanco);
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 440px;
  width: 100%;
  min-height: 100vh;
  background: linear-gradient(180deg, var(--carbon) 0%, var(--negro) 100%);
  position: relative;
  overflow: hidden;
}

.step { display: none; }
.step.active { display: block; animation: fadeUp .4s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* === Brand Bar === */
.brand-bar {
  padding: 20px 24px 10px;
  text-align: center;
}
.brand-logo {
  max-width: 160px;
  height: auto;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.4));
}
.brand-fallback {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 28px;
  letter-spacing: 3px;
  color: var(--naranja);
}
.brand-bar-sm { padding: 16px 24px 8px; }
.brand-logo-sm { max-width: 120px; height: auto; }

/* === Hero Image === */
.hero-img-wrap {
  position: relative;
  width: 100%;
  padding: 10px 30px 0;
  text-align: center;
}
.hero-img {
  width: 100%;
  max-width: 320px;
  height: auto;
  border-radius: 20px;
  filter: drop-shadow(0 20px 40px rgba(255, 107, 43, 0.2));
  animation: floatBurger 3s ease-in-out infinite;
}
@keyframes floatBurger {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.hero-badge {
  position: absolute;
  top: 14px;
  right: 34px;
  background: var(--naranja);
  color: var(--blanco);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 50px;
  letter-spacing: 0.3px;
  box-shadow: 0 4px 16px var(--naranja-glow);
  animation: badgePop .5s ease .3s backwards;
}
@keyframes badgePop { from { transform: scale(0); } to { transform: scale(1); } }

/* === Product Info === */
.product-info {
  padding: 20px 28px 0;
}
.product-name {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 38px;
  letter-spacing: 2px;
  color: var(--blanco);
  line-height: 1;
  margin-bottom: 8px;
}
.product-desc {
  font-size: 14px;
  color: var(--gris);
  line-height: 1.5;
  margin-bottom: 14px;
}
.product-price {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 36px;
  color: var(--naranja);
  letter-spacing: 1px;
}

/* === Quantity === */
.qty-section {
  padding: 24px 28px;
}
.qty-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gris);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 12px;
}
.qty-control {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--humo);
  border-radius: 14px;
  overflow: hidden;
  border: 1.5px solid #333;
  width: fit-content;
}
.qty-btn {
  width: 52px;
  height: 52px;
  background: transparent;
  border: none;
  color: var(--blanco);
  font-size: 22px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
  font-family: inherit;
}
.qty-btn:hover { background: #333; }
.qty-btn:active { background: var(--naranja); }
.qty-input {
  width: 56px;
  height: 52px;
  background: transparent;
  border: none;
  border-left: 1px solid #333;
  border-right: 1px solid #333;
  color: var(--blanco);
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 1px;
  -moz-appearance: textfield;
}
.qty-input::-webkit-inner-spin-button,
.qty-input::-webkit-outer-spin-button { -webkit-appearance: none; }
.qty-total {
  margin-top: 12px;
  font-size: 15px;
  color: var(--gris);
  font-weight: 600;
}
.qty-total::after {
  content: ' c/u';
  font-weight: 400;
  color: #555;
  font-size: 12px;
}

/* === Add to Cart Button === */
.btn-cart {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: calc(100% - 56px);
  margin: 4px 28px 32px;
  padding: 18px;
  background: linear-gradient(135deg, var(--naranja) 0%, var(--naranja-oscuro) 100%);
  color: var(--blanco);
  border: none;
  border-radius: 50px;
  font-size: 17px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 8px 28px var(--naranja-glow);
  transition: transform .15s, box-shadow .2s;
  letter-spacing: 0.3px;
}
.btn-cart:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px var(--naranja-glow);
}
.btn-cart:active { transform: translateY(0); }
.btn-cart-icon { font-size: 20px; }

/* === Back Link === */
.back-link {
  display: inline-block;
  color: var(--naranja);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  padding: 0 28px;
  margin-bottom: 16px;
  transition: transform .2s;
}
.back-link:hover { transform: translateX(-4px); }

/* === Order Summary === */
.order-summary {
  margin: 0 28px 20px;
  background: var(--humo);
  border-radius: var(--radius);
  padding: 16px 18px;
  border: 1px solid #333;
}
.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 15px;
}
.summary-row span { color: var(--gris); }
.summary-row strong {
  color: var(--naranja);
  font-family: 'Bebas Neue', sans-serif;
  font-size: 20px;
  letter-spacing: 1px;
}

/* === Form === */
.form-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 26px;
  letter-spacing: 1.5px;
  color: var(--blanco);
  padding: 0 28px;
  margin-bottom: 20px;
  text-align: left;
}
form { padding: 0 28px 32px; }
form label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--gris);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
  margin-top: 14px;
}
form label:first-of-type { margin-top: 0; }
.optional { font-weight: 400; color: #555; text-transform: none; letter-spacing: 0; }
form input {
  width: 100%;
  padding: 14px 16px;
  background: var(--humo);
  border: 1.5px solid #333;
  border-radius: 12px;
  color: var(--blanco);
  font-size: 15px;
  font-family: inherit;
  transition: border-color .2s, box-shadow .2s;
}
form input::placeholder { color: #555; }
form input:focus {
  outline: none;
  border-color: var(--naranja);
  box-shadow: 0 0 0 3px var(--naranja-glow);
}

/* === WhatsApp Button (pulsating) === */
.btn-whatsapp {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  margin-top: 24px;
  padding: 18px;
  background: linear-gradient(135deg, var(--verde-wa) 0%, var(--verde-wa-oscuro) 100%);
  color: var(--blanco);
  border: none;
  border-radius: 50px;
  font-size: 17px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 8px 28px rgba(37, 211, 102, 0.35);
  transition: transform .15s, box-shadow .2s;
  letter-spacing: 0.3px;
  position: relative;
  overflow: visible;
}
.btn-whatsapp:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(37, 211, 102, 0.45);
}
.btn-whatsapp:active { transform: translateY(0); }
.wa-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

/* Pulse ring animation */
.pulse-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50px;
  border: 2px solid var(--verde-wa);
  animation: pulse 2s ease-out infinite;
  pointer-events: none;
}
@keyframes pulse {
  0% { transform: scale(1); opacity: 0.7; }
  100% { transform: scale(1.08); opacity: 0; }
}

/* === Responsive === */
@media (max-width: 400px) {
  .product-name { font-size: 32px; }
  .product-price { font-size: 30px; }
  .hero-img { max-width: 280px; }
  .btn-cart, form { margin-left: 20px; margin-right: 20px; }
  .btn-cart { width: calc(100% - 40px); }
  .product-info, .qty-section { padding-left: 20px; padding-right: 20px; }
  .order-summary { margin-left: 20px; margin-right: 20px; }
  .form-title { padding-left: 20px; padding-right: 20px; }
  .back-link { padding-left: 20px; }
}