* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  margin: 0;
  background: #000;
}

/* FRAME */
.app-wrapper {
  display: flex;
  justify-content: center;
  padding: 20px 0;
}

.mobile-frame {
  width: 390px;
  height: 800px;
  background: #fafafa;
  border-radius: 32px;
  overflow: hidden;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,.6);
}

/* HEADER */
.header {
  background: linear-gradient(#b31212, #7a0c0c);
  color: #fff;
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  cursor: pointer;
}

.cart-btn {
  cursor: pointer;
}

.cart-btn.pulse {
  animation: pulse .35s;
}

@keyframes pulse {
  50% { transform: scale(1.25); }
}

/* DEMO */
.demo-banner {
  background: #eee;
  text-align: center;
  padding: 6px;
  font-size: 12px;
}

/* SCROLL CONTENT */
.app-content {
  position: absolute;
  top: 96px;
  bottom: 56px;
  left: 0;
  right: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* PROMO */
.promo {
  margin: 14px;
  padding: 20px;
  border-radius: 24px;
  color: #fff;
  background:
    linear-gradient(180deg, rgba(0,0,0,.25), rgba(0,0,0,.75)),
    url("https://images.unsplash.com/photo-1542281286-9e0a16bb7366");
  background-size: cover;
  box-shadow: 0 18px 40px rgba(0,0,0,.55);
}

.promo-price {
  font-size: 34px;
  font-weight: 800;
  color: #ffd166;
}

/* BUTTON */
.btn-primary {
  width: 100%;
  padding: 15px;
  border-radius: 28px;
  border: none;
  background: linear-gradient(#ff7a18, #ff4e00);
  color: #fff;
  cursor: pointer;
}

/* CATEGORIES */
.categories {
  display: flex;
  gap: 6px;
  padding: 10px;
}

.categories button {
  flex: 1;
  padding: 8px;
  border-radius: 999px;
  border: 1px solid #ddd;
  background: #fff;
}

.categories button.active {
  background: linear-gradient(#ff7a18, #ff4e00);
  color: #fff;
  border: none;
}

/* PRODUCTS */
.list {
  padding: 12px;
}

.card {
  background: #fff;
  border-radius: 18px;
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: 0 8px 18px rgba(0,0,0,.1);
}

.card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.card-content {
  padding: 12px;
}

/* FULL SCREENS */
.cart-screen,
.checkout-screen,
.promo-screen,
.confirm-screen {
  position: absolute;
  inset: 0;
  background: #fafafa;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: .45s cubic-bezier(.25,.8,.25,1);
  z-index: 2000;
}

.show {
  transform: translateX(0);
}

/* HEADERS */
.cart-header {
  background: linear-gradient(#b31212,#7a0c0c);
  color: #fff;
  padding: 12px;
  display: flex;
  gap: 10px;
  align-items: center;
}

.back-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,.25);
  color: #fff;
  font-size: 18px;
}

/* CART */
.cart-items,
.promo-list {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
}

.cart-item {
  background: #fff;
  padding: 12px;
  border-radius: 14px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* QTY CONTROLS */
.qty-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.qty {
  min-width: 22px;
  text-align: center;
  font-weight: 600;
}

.qty-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: #f2f2f2;
  font-size: 18px;
  cursor: pointer;
}

.remove-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: #ffe5e5;
  color: #c0392b;
  font-size: 16px;
  cursor: pointer;
}

/* REMOVE ANIM */
.cart-item.removing {
  animation: slideOutLeft .35s cubic-bezier(.4,0,.2,1) forwards;
}

@keyframes slideOutLeft {
  to {
    transform: translateX(-120%);
    opacity: 0;
    height: 0;
    margin: 0;
    padding: 0;
  }
}

/* SHAKE */
.cart-item.shake {
  animation: shakeX .25s ease;
}

@keyframes shakeX {
  0% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  50% { transform: translateX(6px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

/* FOOTER */
.cart-footer {
  padding: 14px;
  background: #fff;
  box-shadow: 0 -4px 12px rgba(0,0,0,.15);
}

/* CHECKOUT */
.checkout-content {
  padding: 16px;
}

.form-card {
  background: #fff;
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 14px;
  box-shadow: 0 6px 14px rgba(0,0,0,.08);
}

.form-card input,
.form-card select {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid #ddd;
}

/* CONFIRM */
.confirm-screen {
  justify-content: center;
  align-items: center;
}

.check {
  font-size: 64px;
  color: #2ecc71;
}

/* BOTTOM NAV */
.bottom-nav {
  position: absolute;
  bottom: 0;
  width: 100%;
  display: flex;
  background: linear-gradient(#b31212,#7a0c0c);
}

.bottom-nav button {
  flex: 1;
  background: none;
  border: none;
  color: #fff;
  padding: 10px;
}