* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  height: 100%;
  overflow: hidden;
  background: linear-gradient(to bottom, #fe3064, #ff5a49);
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  padding: 20px;
  position: relative;
}

.card-stack {
  width: 100%;
  max-width: 350px;
  height: calc(100vh - 180px);
  position: relative;
  margin-bottom: 30px;
  transition: border 0.3s ease;
}

.card {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  background-color: #fff;
  cursor: grab;

  transition: transform 0.3s ease-out, background-color 0.3s ease-out;
  touch-action: none;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  will-change: transform, opacity;
}
.card.swiping-right {
  border: 3px solid;
  border-color: rgb(64, 202, 64); /* xanh khi kéo phải */
}

.card.swiping-left {
  border: 3px solid;

  border-color: rgb(243, 30, 30); /* đỏ khi kéo trái */
}

.card.dragging {
  transition: none;
  cursor: grabbing;
}

.card img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.card-info {
  position: relative;
  z-index: 2;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0));
  padding: 20px;
  padding-top: 50px;
}

.card-info h2 {
  margin-bottom: 5px;
  font-size: 1.8em;
  color: #fff;
}

.card-info span {
  font-weight: normal;
}

.card-info p {
  font-size: 1.1em;
  line-height: 1.4;
  color: #ccc;
}

.card-stack .card:nth-child(2) {
  transform: scale(0.95) translateY(10px);
  z-index: -1;
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

.card-stack .card:nth-child(3) {
  transform: scale(0.9) translateY(20px);
  z-index: -2;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

.card.swipe-exit-right {
  transform: translate(150vw, 0) rotate(30deg);
  opacity: 0;
  transition: transform 0.5s ease-in-out, opacity 0.5s ease-in-out;
}

.card.swipe-exit-left {
  transform: translate(-150vw, 0) rotate(-30deg);
  opacity: 0;
  transition: transform 0.5s ease-in-out, opacity 0.5s ease-in-out;
}

/* Controls */
.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 350px;
  padding: 20px 0;
}

.control-btn {
  border: none;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  font-size: 2em;
  margin: 0 15px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease-in-out, background-color 0.2s ease-in-out,
    color 0.2s ease-in-out;
  flex-shrink: 0;
}

.control-btn:active {
  transform: scale(0.9);
}

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

.no-more-users {
  text-align: center;
  color: #fff;
  font-size: 1.5em;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}