body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(to right, #1a1a1a, #000000);
  color: #f5f5f5;
  line-height: 1.6;
}

/* Header */
header {
  text-align: center;
  padding: 60px 20px;
  background-image: url(./img/about.jpg);
  background-size: cover;
  background-position: center;
  color: white;
}

header img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.8);
  margin-bottom: 20px;
  object-fit: cover;
}

header h1 {
  margin: 10px 0;
  font-size: 2.5rem;
  font-weight: 700;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Container chính */
.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
}

/* Section */
section {
  margin-bottom: 50px;
}

h2 {
  color: #ff6600;
  border-left: 4px solid #ff6600;
  padding-left: 10px;
  margin-bottom: 20px;
  font-size: 1.6rem;
}

/* Xử lý ảnh trong nội dung */
section img {
  display: block;
  max-width: 100%;
  max-height: 350px;
  margin: 15px auto;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

/* Video và Audio */
section video,
section audio {
  display: block;
  margin: 15px auto;
  max-width: 100%;
  border-radius: 10px;
  outline: none;
}

/* Social */
.social a {
  display: inline-block;
  margin: 0 10px;
  padding: 8px 16px;
  border-radius: 20px;
  background: #ff6600;
  color: white;
  text-decoration: none;
  transition: 0.3s;
}

.social a:hover {
  background: #e65c00;
}

/* Timeline */
.timeline {
  position: relative;
  margin: 20px 0;
  padding-left: 120px; /* đẩy chữ qua xa line hơn */
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  left: 60px; /* đường thẳng */
  width: 4px;
  height: 100%;
  background: #ff6600;
}

.timeline-item {
  margin-bottom: 40px;
  position: relative;
}


.timeline-item h3 {
  margin: 0;
  color: #ff6600;
  font-size: 1.3rem;
  font-weight: bold;
}

.timeline-item p {
  margin: 5px 0 0 0;
}


.timeline-item img {
  margin-top: 10px;
  border-radius: 10px;
  max-width: 100%;
  max-height: 300px;
  object-fit: cover;
}

/* Footer */
footer {
  text-align: center;
  padding: 20px;
  background: #111;
  font-size: 0.9rem;
}

footer a {
  color: #ff6600;
  text-decoration: none;
  margin: 0 10px;
}
.back-home {
  text-align: center;
  margin: 20px 0;
}

.back-home a {
  display: inline-block;
  padding: 10px 20px;
  background: #ff6600;
  color: #fff;
  border-radius: 25px;
  text-decoration: none;
  font-weight: bold;
  transition: 0.3s;
}

.back-home a:hover {
  background: #e65c00;
}