/* Reset cơ bản */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #1f2937;
  background: #f9fafb;
}

/* ================= HEADER ================= */
.header-bg {
  background: linear-gradient(135deg, #4f46e5, #9333ea); /* Xanh tím gradient */
  color: #fff;
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.header-bg h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: 1px;
}

.header-bg p {
  font-size: 1.2rem;
  font-weight: 500;
}

/* Avatar */
.profile-image {
  border-radius: 50%;
  border: 4px solid #fff;
  box-shadow: 0 8px 20px rgba(0,0,0,0.25);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.profile-image:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 25px rgba(0,0,0,0.3);
}

/* Thông tin cá nhân */
.info-item {
  background: rgba(255, 255, 255, 0.08);
  padding: 3px 10px;       /* nhỏ hơn nữa */
  border-radius: 6px;
  white-space: nowrap;
  display: flex;
  align-items: center;
  font-size: 15px;
  line-height: 1.3;        /* giảm chiều cao chữ */
}

.info-item svg, 
.info-item .material-icons {
  margin-right: 10px;
  font-size: 22px;
  opacity: 0.9;
}

/* Nút bấm */
.btn-primary {
  background: #fff;
  color: #4f46e5;
  padding: 12px 28px;
  border-radius: 9999px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background: #f3f4f6;
  transform: translateY(-2px);
}

.btn-outline {
  border: 2px solid #fff;
  color: #fff;
  padding: 12px 28px;
  border-radius: 9999px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-outline:hover {
  background: #fff;
  color: #4f46e5;
  transform: translateY(-2px);
}

/* ================= SECTION CHUNG ================= */
section {
  padding: 60px 20px;
}

section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: #4f46e5;
  text-align: center;
  position: relative;
}

section h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: #9333ea;
  margin: 0.5rem auto 0;
  border-radius: 2px;
}

/* ================= FOOTER ================= */
footer {
  background: #1f2937;
  color: #d1d5db;
  text-align: center;
  padding: 20px;
  font-size: 0.9rem;
}

footer a {
  color: #9333ea;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}