/* ---- CÀI ĐẶT CHUNG & NỀN ---- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  overflow: hidden; /* Giữ nguyên để tránh thanh cuộn */
}

#container {
  width: 100vw;
  height: 100vh;
  /* Làm nền tối hơn và chuyển màu mượt hơn */
  background: radial-gradient(circle at center, #0a0a1f 0%, #000000 100%);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
}

canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 11;
}

/* ---- MÀN HÌNH CẢNH BÁO XOAY NGANG ---- */
#landscape-warning {
  position: fixed;
  z-index: 9999;
  top: 0; left: 0; right: 0; bottom: 0;
  /* Nền vũ trụ sâu thẳm, màu xanh tím */
  background: radial-gradient(ellipse at center, #1c1a3a 0%, #0c0a1f 100%);
  color: #e0eaff; /* Màu chữ chung */
  display: none; /* Ẩn ban đầu, JS sẽ điều khiển */
  justify-content: center;
  align-items: center;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease-in-out;
}
/* Kích hoạt hiển thị cảnh báo */
body.portrait #landscape-warning {
  display: flex;
  opacity: 1;
  pointer-events: auto;
}

/* Nội dung cảnh báo - Nâng cấp lớn ở đây! */
#landscape-warning .warning-content {
  position: relative;
  z-index: 2;
  padding: 2rem 2.5rem;
  border-radius: 20px;
  /* Nền thủy tinh mờ, có chiều sâu */
  background: rgba(28, 26, 58, 0.6); 
  backdrop-filter: blur(10px); /* Hiệu ứng kính mờ */
  /* Đường viền phát sáng mềm mại */
  border: 1.5px solid rgba(173, 216, 230, 0.3); /* Lightblue mờ */
  /* Đổ bóng đa lớp để tạo hiệu ứng "hào quang" */
  box-shadow: 
    0 0 40px rgba(78, 88, 216, 0.5), /* Bóng tím xanh lan tỏa */
    0 0 15px rgba(255, 255, 255, 0.1), /* Bóng trắng nhẹ bên trong */
    inset 0 0 8px rgba(173, 216, 230, 0.2); /* Viền sáng bên trong */
  transform: scale(0.95);
  opacity: 0;
  animation: fadeInContent 0.6s 0.2s cubic-bezier(0.165, 0.84, 0.44, 1) forwards;
}
@keyframes fadeInContent {
  to {
    transform: scale(1);
    opacity: 1;
  }
}

#landscape-warning h1 {
  font-family: 'Orbitron', 'Montserrat', sans-serif; /* Giữ font Orbitron */
  font-size: 2rem;
  margin-bottom: 0.5rem;
  letter-spacing: 1.5px;
  color: #ffffff;
  /* Thêm hiệu ứng text-shadow phát sáng */
  text-shadow: 0 0 12px rgba(230, 230, 255, 0.8), 0 0 4px rgba(255, 255, 255, 1);
}
#landscape-warning h1:nth-of-type(2) {
  font-size: 1.5rem; /* Giảm kích thước "Tinh Cầu" */
  margin-bottom: 1.5rem;
  opacity: 0.8;
}

#landscape-warning p {
  font-size: 1.1rem;
  color: #c0c8ff; /* Màu chữ dịu hơn */
  line-height: 1.5;
  text-shadow: 0 0 6px rgba(192, 200, 255, 0.7);
}
#landscape-warning p:last-of-type {
  margin-top: 1rem;
  font-weight: bold;
  letter-spacing: 1px;
}

/* Nền sao động */
#landscape-warning .stars-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 1;
  pointer-events: none;
  background: transparent;
  overflow: hidden; /* Đảm bảo sao không tràn ra ngoài */
}
#landscape-warning .stars-bg::before,
#landscape-warning .stars-bg::after {
  content: '';
  position: absolute;
  width: 200%;
  height: 200%;
  top: -50%; left: -50%;
  /* Các hạt sao nhỏ, mịn hơn */
  background-image:
    radial-gradient(circle, #fff 1px, transparent 1px),
    radial-gradient(circle, #c0c8ff 1px, transparent 1px),
    radial-gradient(circle, #fff 0.5px, transparent 0.5px);
  background-size: 100px 100px, 150px 150px, 60px 60px;
  background-position: 0 0, 50px 50px, 30px 30px;
  opacity: 0;
  animation: stars-move 30s linear infinite, fadeInStars 1s ease-out forwards;
}
#landscape-warning .stars-bg::after {
  background-size: 150px 150px, 80px 80px, 120px 120px;
  background-position: 75px 75px, 40px 40px, 10px 10px;
  animation-duration: 45s;
}
@keyframes fadeInStars {
  to { opacity: 0.6; }
}
@keyframes stars-move {
  from { transform: translateY(0); }
  to { transform: translateY(-50%); } /* Chuyển động theo chiều dọc */
}

/* ---- HIỆU ỨNG BLUR VÀ OVERLAY ---- */
#dark-overlay {
  position: fixed;
  z-index: 5;
  top: 0; left: 0; right: 0; bottom: 0;
  /* Lớp phủ tối hơn để tạo tương phản */
  background: rgba(0, 0, 5, 0.95);
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.8s ease-in-out;
}
body.intro-started #dark-overlay {
  opacity: 0;
  transition-duration: 1.5s;
}
body.portrait #dark-overlay {
  display: none !important;
}

/* Hiệu ứng làm mờ canvas nền */
body.portrait #container canvas {
  filter: blur(10px) brightness(0.6);
  opacity: 0.4;
  transition: filter 0.8s ease-out, opacity 0.8s ease-out;
}
body:not(.portrait) #container canvas {
  filter: blur(0) brightness(1);
  opacity: 1;
  transition: filter 1.2s ease-in, opacity 1.2s ease-in;
}

/* ---- ICON XOAY ĐIỆN THOẠI ---- */
.rotate-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 1.2rem auto;
  /* Cập nhật màu sắc cho icon để đồng bộ */
  background: url('data:image/svg+xml;utf8,<svg width="56" height="56" viewBox="0 0 56 56" fill="none" xmlns="http://www.w3.org/2000/svg"><rect x="12" y="16" width="32" height="24" rx="6" fill="%23fff" stroke="%23c0c8ff" stroke-width="2"/><path d="M28 8v4" stroke="%23c0c8ff" stroke-width="2" stroke-linecap="round"/><path d="M28 44v4" stroke="%23c0c8ff" stroke-width="2" stroke-linecap="round"/><path d="M8 28h4" stroke="%23c0c8ff" stroke-width="2" stroke-linecap="round"/><path d="M44 28h4" stroke="%23c0c8ff" stroke-width="2" stroke-linecap="round"/><path d="M18 38l-4 4" stroke="%23a985d4" stroke-width="2" stroke-linecap="round"/><path d="M38 38l4 4" stroke="%23a985d4" stroke-width="2" stroke-linecap="round"/><path d="M18 18l-4-4" stroke="%23a985d4" stroke-width="2" stroke-linecap="round"/><path d="M38 18l4-4" stroke="%23a985d4" stroke-width="2" stroke-linecap="round"/></svg>') center/contain no-repeat;
  animation: rotate-phone 1.8s infinite cubic-bezier(0.68, -0.55, 0.27, 1.55);
}
@keyframes rotate-phone {
  0% { transform: rotate(0deg) scale(1); }
  25% { transform: rotate(-25deg) scale(1.1); }
  50% { transform: rotate(0deg) scale(1); }
  75% { transform: rotate(25deg) scale(1.1); }
  100% { transform: rotate(0deg) scale(1); }
}

/* ---- TET BUTTON ---- */
.tet-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  background: linear-gradient(135deg, #ff4444, #cc1111);
  color: white;
  border: none;
  border-radius: 50px;
  padding: 12px 20px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 
    0 4px 15px rgba(255, 68, 68, 0.4),
    0 0 20px rgba(255, 68, 68, 0.3);
  transition: all 0.3s ease;
  font-family: 'Arial', sans-serif;
  text-decoration: none;
  display: inline-block;
}

.tet-btn:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 6px 20px rgba(255, 68, 68, 0.6),
    0 0 30px rgba(255, 68, 68, 0.5);
  background: linear-gradient(135deg, #ff5555, #dd2222);
  color: white;
  text-decoration: none;
}

/* ---- NUOI ANH EM BUTTON ---- */
.nuoi-btn {
  position: fixed;
  top: 20px;
  right: 140px;
  z-index: 1000;
  background: linear-gradient(135deg, #7c3aed, #5b21b6);
  color: white;
  border: none;
  border-radius: 50px;
  padding: 12px 20px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 
    0 4px 15px rgba(124, 58, 237, 0.4),
    0 0 20px rgba(124, 58, 237, 0.3);
  transition: all 0.3s ease;
  font-family: 'Arial', sans-serif;
  text-decoration: none;
  display: inline-block;
}

.nuoi-btn:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 6px 20px rgba(124, 58, 237, 0.6),
    0 0 30px rgba(124, 58, 237, 0.5);
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  color: white;
  text-decoration: none;
}

/* Responsive cho mobile */
@media (max-width: 480px) {
  .tet-btn {
    top: 10px;
    right: 10px;
    padding: 10px 16px;
    font-size: 14px;
  }
  
  .nuoi-btn {
    top: 50px;
    right: 10px;
    padding: 10px 16px;
    font-size: 14px;
  }
}