/* ----------------------------------
   1. Biến chung (CSS Variables)
-----------------------------------*/
:root {
  --primary:   #ff3366;
  --secondary: #ff4d88;
  --bg-start:  #fce4ec;
  --bg-end:    #f3e5f5;
  --card-bg:   #fff0f5;
  --shadow:    rgba(0, 0, 0, 0.05);
  --radius:    15px;
  --fast:      0.2s;
}

/* ----------------------------------
   2. Reset & Base
-----------------------------------*/
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0; padding: 0;
}
body {
  background: linear-gradient(to right, var(--bg-start), var(--bg-end));
  font-family: 'Quicksand', sans-serif;
  color: #333;
  display: flex; justify-content: center; align-items: center;
  min-height: 100vh; padding: 10px;
  overflow-x: hidden;
}

/* ----------------------------------
   3. Wrapper & Typography
-----------------------------------*/
.wrapper {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: 0 2px 8px var(--shadow);
  text-align: center;
  width: 100%; max-width: 1100px;
  padding: 20px;
}
h1 {
  color: var(--secondary);
  font-size: 2.5rem;
  margin-bottom: 1rem;
  transition: transform var(--fast), color var(--fast);
}
h1:hover {
  transform: scale(1.1);
  color: var(--primary);
}

/* ----------------------------------
   4. Buttons (gộp chung .btn)
-----------------------------------*/
button, .btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  font: inherit;
  padding: 0.5rem 1rem;
  box-shadow: 0 2px 4px var(--shadow);
  transition: background var(--fast), transform var(--fast);
}
button:disabled {
  background: #ccc;
  cursor: not-allowed;
}
button:hover:not(:disabled),
.btn:hover {
  background: #e62e58;
  transform: scale(1.03);
}

/* ----------------------------------
   5. Đồng hồ & Ngày tháng
-----------------------------------*/
.clock {
  background: #ffe5ec;
  border: 2px solid #ffb6c1;
  border-radius: 30px;
  padding: 1rem 2rem;
  box-shadow: 0 2px 8px var(--shadow);
  text-align: center;
  transition: transform var(--fast);
}
.clock:hover {
  transform: scale(1.02);
}
.clock time {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
}

/* ----------------------------------
   6. Info Grid (avatar + tên)
-----------------------------------*/
.info {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
}
.info img {
  width: 100px; height: 100px;
  border-radius: 50%;
  object-fit: cover;
  transition: transform var(--fast);
}
.info img:hover {
  transform: scale(1.1);
}
.info p {
  font-weight: bold;
  font-size: 1rem;
}

/* ----------------------------------
   7. Video List (đơn giản hóa)
-----------------------------------*/
.video-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.video-item {
  background: var(--card-bg);
  border-radius: 20px;
  overflow: hidden;
  transition: transform var(--fast), box-shadow var(--fast);
  flex: 1 1 200px;
  max-width: 400px;
}
.video-item:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 12px var(--shadow);
}

/* ----------------------------------
   8. Utility
-----------------------------------*/
.hidden { display: none !important; }

/* ----------------------------------
   9. Mobile-First Responsive
-----------------------------------*/
@media (min-width: 769px) {
  .wrapper { padding: 30px; }
  h1 { font-size: 3rem; }
}