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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  line-height: 1.5;
  background: #000;
  color: #fff;
}

/* CONTAINER CHUNG */
.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

/* HEADER + NAV TRÊN NỀN ẢNH */
.header {
  position: fixed;           /* luôn dính trên cùng */
  top: 0;
  left: 0;
  width: 100%;
  background: transparent;   /* trong suốt, thấy ảnh hero phía sau */
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.logo {
  font-weight: 700;
  text-decoration: none;
  color: #fff;
}

.nav a {
  margin-left: 18px;
  text-decoration: none;
  color: #fff;
  opacity: 0.85;
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nav a:hover {
  opacity: 1;
}

/* HERO FULL MÀN HÌNH */
.hero {
  position: relative;
  height: 100vh;
  background: url("../assets/home-hero.jpg") center/cover no-repeat; /* đổi đường dẫn nếu cần */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* hero trang sound portfolio */
.hero-sound {
  background: url("../assets/sound-hero.jpg") center/cover no-repeat;
}

/* LỚP LỌC TỐI */
.hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

/* NỘI DUNG CHỮ TRONG HERO */
.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 64px;
  letter-spacing: 4px;
  margin-bottom: 10px;
}

.hero h2 {
  font-size: 40px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero p {
  font-size: 18px;
  letter-spacing: 3px;
  opacity: 0.85;
}

/* CÁC SECTION PHÍA DƯỚI */
main {
  margin-top: 0;
}

.section {
  padding: 64px 0;
  border-top: 1px solid #222;
  background: #000;
}

.section h2 {
  margin-bottom: 16px;
}

/* NÚT */
.btn {
  display: inline-block;
  padding: 10px 14px;
  border: 1px solid #fff;
  text-decoration: none;
  color: #fff;
}

/* VIDEO EMBED */
.embed {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
}

.embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* FOOTER */
.footer {
  padding: 40px 0 60px;
  border-top: 1px solid #222;
  background: #000;
  color: #ccc;
  font-size: 13px;
}

.footer-inner {
  text-align: center;
}

/* hàng LINKEDIN – IMDB – SOUNDCLOUD */
.footer-links {
  margin-bottom: 18px;
  letter-spacing: 2px;
}

.footer-links a {
  margin: 0 18px;
  text-decoration: none;
  color: #888;
  font-size: 11px;
  text-transform: uppercase;
}

.footer-links a:hover {
  color: #fff;
}

/* 2 dòng bên dưới */
.footer-copy,
.footer-powered {
  margin-bottom: 6px;
}