/* ===== Cài đặt chung ===== */
body {
  background: linear-gradient(135deg, #0a0e1a 0%, #1a1a3a 100%);
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  padding: 0;
  font-size: 18px;
  min-height: 100vh;
  overflow: hidden;
  transition: all 0.5s ease-in-out;
}

/* ===== Layout các trang chính (Chung cho cả Light và Dark Mode) ===== */
.profile-basic,
.personal-info,
.social-media,
.project-page {
  width: 100%;
  max-width: 800px;
  padding: 30px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.16);
  border-radius: 18px;
  margin: 0;
  transition: background-color 0.5s ease-in-out, color 0.5s ease-in-out, border 0.5s ease-in-out;
}

/* ===== Header trang cá nhân ===== */
.profile-basic .header {
  overflow: hidden;
  position: relative;
  gap: 24px;
  margin-bottom: 20px;
}

/* ===== Ảnh đại diện ===== */
.profile-basic img {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid #000;
  transition: all 0.3s ease;
  float: left;
  margin-right: 10px;
}
.profile-basic img:hover {
  transform: scale(1.05);
}

/* ===== Thông tin cơ bản (tên, chuyên ngành, trường học) ===== */
.profile-basic .name {
  font-size: 2.2rem;
  font-weight: bold;
  margin-bottom: 10px;
  text-align: center;
  transition: color 0.5s ease-in-out;
}

.profile-basic .major,
.profile-basic .school {
  font-size: 1.1rem;
  margin-bottom: 5px;
  text-align: center;
  transition: color 0.5s ease-in-out;
}
.Skill {
  text-align: left;
}

/* ===== Kỹ năng ===== */
.skills-list {
  list-style-type: none;
  padding: 0;
  display: flex;
  gap: 10px;
}

.skill-item {
  padding: 8px 16px;
  border-radius: 20px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.skill-item:hover {
  transform: translateY(-5px);
}

/* ===== Trang Dự Án ===== */
.project-page h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  transition: color 0.5s ease-in-out;
}
.project-list {
  width: 100%;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.project-item {
  border-radius: 10px;
  padding: 16px 18px;
  text-align: left;
  transition: all 0.3s ease;
}
.project-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}
.project-title {
  font-size: 1.2rem;
  font-weight: bold;
  margin-bottom: 6px;
  transition: color 0.5s ease-in-out;
}
.project-desc {
  font-size: 1rem;
  transition: color 0.5s ease-in-out;
}
.project-link {
  text-decoration: none;
  font-size: 0.9rem;
  display: block;
  margin-top: 10px;
  font-weight: bold;
  transition: color 0.3s ease;
}
.project-link i {
  margin-right: 5px;
}

/* ===== Thông tin cá nhân & mạng xã hội ===== */
.personal-info ul,
.social-media ul {
  list-style: none;
  padding: 0;
  text-align: left;
}
.personal-info li {
  margin-bottom: 12px;
  padding-bottom: 12px;
  transition: border-bottom 0.5s ease-in-out;
}
.social-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-top: 20px;
}

.social-link i {
  font-size: 2.5em;
  transition: color 0.3s ease, transform 0.2s ease;
}

.social-link:hover i {
  transform: translateY(-8px) scale(1.1);
}

/* ===== Nút cuộn lên đầu trang ===== */
.back-to-top-btn {
  margin: 32px auto 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1877f3;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 2rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(24,119,243,0.12);
  transition: background 0.2s, transform 0.2s;
  z-index: 10;
}
.back-to-top-btn:hover {
  background: #0e5fd8;
  transform: translateY(-4px) scale(1.08);
}

/* ===== Nút kêu gọi hành động ===== */
.cta-button {
  background: linear-gradient(90deg, #f64f59, #c471ed);
  padding: 12px 24px;
  border-radius: 50px;
  color: white;
  font-weight: bold;
  margin-top: 20px;
  display: inline-block;
  transition: all 0.3s;
  text-decoration: none;
  font-size: 1.1rem;
  margin-left: 20px;
}
.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

/* ===== Các lớp và hoạt ảnh để tạo hiệu ứng chuyển động và chuyển trang (sử dụng với JavaScript) ===== */
.fade-in {
  transform-style: preserve-3d;
  transition: all 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, 100vh);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.fade-in.visible {
  transform: translate(-50%, -50%) rotateY(0deg);
  opacity: 1;
}
.fade-in:not(.visible) {
  transform: translate(-50%, -50%) rotateY(90deg);
  opacity: 0;
}

.slide-up-out-smooth {
  animation: slideUpOutSmooth 0.8s forwards;
}

@keyframes slideUpOutSmooth {
  from {
    transform: translate(-50%, -50%);
    opacity: 1;
  }
  to {
    transform: translate(-50%, -100%);
    opacity: 0;
  }
}

/* ===== Thiết kế đáp ứng (Responsive) cho các thiết bị di động ===== */
@media (max-width: 768px) {
  .profile-basic .header { flex-direction: column; text-align: center;}
  .profile-basic .name { font-size: 1.8rem;}
  .profile-basic img { width: 120px; height: 120px;}
}
@media (max-width: 992px) {
  .profile-basic .header { gap: 15px;}
  .project-item { padding: 12px;}
}

/* ===== Hiệu ứng hạt nền (particles.js) ===== */
#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: -1;
  left: 0;
  top: 0;
}

/* ========================================================================== */
/* CHẾ ĐỘ SÁNG (LIGHT MODE STYLES)                               */
/* ========================================================================== */
.light-mode body {
  /* Thêm các kiểu dáng riêng của chế độ sáng cho thẻ body nếu cần */
}

/* --- Trang 1: Thông tin cơ bản (Chế độ sáng) --- */
.light-mode .profile-basic {
  background: #c2d7df;
  border: 5px solid #000000;
  color: #222;
}
.light-mode .profile-basic .name,
.light-mode .skills-title {
  color: #222;
}
.light-mode .profile-basic .major,
.light-mode .profile-basic .school {
  color: #555;
}
.light-mode .skill-item {
  color: rgb(0, 0, 0);
  background-color: #ffffff;
  border: 2px solid #000;
}

/* --- Trang 2: Trang dự án (Chế độ sáng) --- */
.light-mode .project-page {
  background: #c2d7df;
  border: 5px solid #000000;
  color: #222;
}
.light-mode .project-page h2 {
  color: #04122a;
}
.light-mode .project-item {
  background: #cecccc !important;
  border-left: 5px solid #f64f59;
}
.light-mode .project-item:hover {
  background: #d9d9d9 !important;
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}
.light-mode .project-title {
  color: #222;
}
.light-mode .project-desc {
  color: #444;
}
.light-mode .project-link {
  color: #0056b3 !important;
}

/* --- Trang 3: Thông tin cá nhân (Chế độ sáng) --- */
.light-mode .personal-info {
  background: #c2d7df;
  border: 5px solid #000000;
  color: #222;
}
.light-mode .personal-info ul li {
  border-bottom: 1px dashed #000000;
}

/* --- Trang 4: Mạng xã hội (Chế độ sáng) --- */
.light-mode .social-media {
  background: #c2d7df;
  border: 5px solid #000000;
  color: #222;
}
.light-mode .social-link i {
  color: #222;
}
.light-mode .social-link.facebook:hover i { color: #3b5998; }
.light-mode .social-link.twitter:hover i { color: #1da1f2; }
.light-mode .social-link.telegram:hover i { color: #0088cc; }
.light-mode .social-link.github:hover i { color: #333; }
.light-mode .social-link.instagram:hover i {
  background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285AEB 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}


/* ========================================================================== */
/* CHẾ ĐỘ TỐI (DARK MODE STYLES)                               */
/* ========================================================================== */
body:not(.light-mode) .profile-basic,
body:not(.light-mode) .project-page,
body:not(.light-mode) .personal-info,
body:not(.light-mode) .social-media {
  background-color: #082149;
  border: 5px solid #244eb8;
}

/* --- Ghi đè màu chữ chung cho Chế độ tối --- */
/* Áp dụng cho hầu hết các phần tử văn bản trong chế độ tối, đảm bảo chữ màu trắng */
body:not(.light-mode) .project-page,
body:not(.light-mode) .personal-info,
body:not(.light-mode) .social-media,
body:not(.light-mode) .project-title,
body:not(.light-mode) .profile-basic .name,
body:not(.light-mode) .skill-item,
body:not(.light-mode) .project-desc,
body:not(.light-mode) .project-item,
body:not(.light-mode) .cta-button,
body:not(.light-mode) .back-to-top-btn,
body:not(.light-mode) .project-page *,
body:not(.light-mode) .profile-basic *,
body:not(.light-mode) .personal-info *,
body:not(.light-mode) .social-media  {
  color: #fff !important;
}
body:not(.light-mode) .project-page h2,
body:not(.light-mode) .project-page .project-title,
body:not(.light-mode) .project-page .project-desc,
body:not(.light-mode) .project-page .project-item {
  color: #fff !important;
}

/* --- Trang 1: Thông tin cơ bản (Chế độ tối) --- */
body:not(.light-mode) .skill-item {
  border: 2px solid #007bff;
  background-color: #244eb8;
}
body:not(.light-mode) .skill-item:hover {
  background-color: #0c3674;
}

/* --- Trang 2: Trang dự án (Chế độ tối) --- */
body:not(.light-mode) .project-item {
  background: #0f3270 !important;
  border-left: 5px solid #24add3;
}
body:not(.light-mode) .project-link {
  color: #0099ff !important;
}

/* --- Trang 3: Thông tin cá nhân (Chế độ tối) --- */
body:not(.light-mode) .personal-info li {
  border-bottom: 1px dashed #fff;
}

/* --- Trang 4: Mạng xã hội (Chế độ tối) --- */
body:not(.light-mode) .social-link i {
  color: #fff;
}
body:not(.light-mode) .social-link.facebook:hover i { color: #3b5998; }
body:not(.light-mode) .social-link.twitter:hover i { color: #1da1f2; }
body:not(.light-mode) .social-link.telegram:hover i { color: #0088cc; }
body:not(.light-mode) .social-link.github:hover i { color: #333; }
body:not(.light-mode) .social-link.instagram:hover i {
  background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285AEB 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
body:not(.light-mode) .social-links a[aria-label="Instagram"]:hover i {
  color: #f58529 !important;
}

/* ===== Các nút chức năng (chuyển đổi chủ đề/ngôn ngữ) ===== */
#theme-toggle, #lang-toggle {
  width: 48px;
  height: 48px;
  font-size: 2rem;
  border-radius: 50%;
  border: none;
  background: #fff;
  color: #222;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
  position: fixed;
  right: 24px;
  z-index: 100;
}
#theme-toggle {
  top: 24px;
  margin-bottom: 16px;
}
#lang-toggle {
  top: 88px;
  margin-top: 0;
}
#theme-toggle:hover, #lang-toggle:hover {
  background: #70cbe0;
  color: #fff;
  transform: scale(1.08);
}