/* ==============================
🔤 1. Font & Reset cơ bản
============================== */
@import url('https://fonts.googleapis.com/css?family=Quicksand:400,700&display=swap');

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

body {
  font-family: 'Quicksand', sans-serif;
  background: linear-gradient(to right, #fce4ec, #f3e5f5);
  color: #333;
  min-height: 100vh;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow-x: hidden;
  animation: softGlow 15s infinite alternate;
}

/* ==============================
📦 2. Wrapper tổng chứa nội dung
============================== */
#wrapper {
  background: #fff0f5;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
  border-radius: 15px;
  max-width: 1200px;
  width: 100%;
  padding: 30px;
  text-align: center;
  margin-top: 60px;
}

/* ==============================
🎨 3. Style chữ & layout chung
============================== */
h1 {
  font-size: 4rem;
  margin-bottom: 20px;
  color: #ff4d88;
  transition: 0.3s;
}

h1:hover {
  color: #ff3366;
  transform: scale(1.1);
}

.section-title {
  font-size: 2.4rem;
  margin: 70px 0 30px;
  color: #ff4d88;
  text-align: center;
  text-shadow: 0 2px 4px rgba(255, 105, 180, 0.3);
}

/* ==============================
🛠 4. Các lớp layout tái sử dụng
============================== */
.text-center {
  text-align: center;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hidden {
  display: none !important;
}

.rounded {
  border-radius: 15px;
}

.shadow {
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
}

/* ==============================
🎞 5. Hiệu ứng dùng chung
============================== */
@keyframes softGlow {
  0% { filter: brightness(100%); }
  100% { filter: brightness(105%) saturate(105%); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==============================
🧪 6. Audio mặc định (nếu dùng lại)
============================== */
audio {
  width: 100%;
  border-radius: 50px;
  border: 2px solid #ff4d88;
  transition: border-color 0.3s, box-shadow 0.3s;
}

audio:hover {
  border-color: #ff3366;
  box-shadow: 0 0 8px rgba(255, 51, 102, 0.5);
}

html, body {
  height: auto !important;
  min-height: 100%;
}