/* ===== LAYOUT STYLES ===== */

/* ===== NAVIGATION ===== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
  will-change: backdrop-filter;
  transform: translateZ(0);
}

[data-theme="light"] #navbar {
  background: rgba(255, 255, 255, 0.75);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--text-primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-controls {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.music-btn,
.theme-btn {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.music-btn:hover,
.theme-btn:hover {
  background: var(--glass-border);
  transform: scale(1.05);
}

.music-btn.playing {
  color: var(--accent-color);
}

/* ===== HERO SECTION ===== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-section::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 180px;
  background: linear-gradient(to bottom, transparent, var(--dark-bg));
  pointer-events: none;
  z-index: 0;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--glass-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--glass-border) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 0%, transparent 75%);
  opacity: 0.6;
}

.bg-layer {
  position: absolute;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.bg-layer-1 {
  background: radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.06) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(0, 112, 243, 0.08) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
}

.bg-layer-2 {
  background: radial-gradient(circle at 60% 40%, rgba(255, 255, 255, 0.04) 0%, transparent 50%);
  animation: float 25s ease-in-out infinite reverse;
}

.bg-layer-3 {
  background: none;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  33% { transform: translateY(-20px) rotate(1deg); }
  66% { transform: translateY(10px) rotate(-1deg); }
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.image-container {
  position: relative;
  width: 220px;
  height: 220px;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--glass-border);
}

.image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.image-container:hover img {
  transform: scale(1.05);
}

.image-glow {
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: -1px;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  opacity: 0.5;
  z-index: -1;
}

.hero-text {
  text-align: left;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-lg);
  line-height: 1.15;
}

.typing-text {
  color: var(--text-primary);
}

.cursor-blink {
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  min-height: 1.5em;
}

.hero-slogan {
  font-style: italic;
  font-size: var(--font-size-md, 1rem);
  color: var(--text-secondary);
  line-height: 1.7;
  padding-left: var(--spacing-lg);
  border-left: 2px solid var(--accent-color);
  margin-bottom: var(--spacing-2xl);
  display: inline-flex;
  flex-direction: column;
}

.hero-slogan span {
  opacity: 0.85;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-lg);
}

/* ===== ABOUT SECTION ===== */
.about-section {
  background: var(--light-bg);
  border-top: 1px solid var(--glass-border);
}

.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.about-text p {
  font-size: var(--font-size-lg);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
  color: var(--text-secondary);
}

.about-features {
  display: grid;
  gap: var(--spacing-lg);
}

.feature-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: left;
  transition: all var(--transition-normal);
}

.feature-item:hover {
  transform: translateY(-2px);
  border-color: var(--text-secondary);
}

.feature-item i {
  font-size: var(--font-size-3xl);
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.feature-item h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.feature-item p {
  color: var(--text-secondary);
  margin: 0;
}

/* ===== STATS SECTION ===== */
.stats-section {
  background: var(--dark-bg);
  border-top: 1px solid var(--glass-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-2xl);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.stat-item:hover {
  transform: translateY(-2px);
  border-color: var(--text-secondary);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: var(--font-size-4xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== SKILLS SECTION ===== */
.skills-section {
  background: var(--light-bg);
  border-top: 1px solid var(--glass-border);
}

.skills-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
}

.skill-category h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--primary-color);
}

.skill-item {
  margin-bottom: var(--spacing-lg);
}

.skill-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.skill-name {
  font-weight: 500;
}

.skill-percent {
  color: var(--primary-color);
  font-weight: 600;
}

.skill-bar {
  height: 8px;
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.skill-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  width: 0;
  transition: width 2s ease;
  position: relative;
}

.skill-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ===== PROJECTS SECTION ===== */
.projects-section {
  background: var(--dark-bg);
  border-top: 1px solid var(--glass-border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-2xl);
}

.project-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--text-secondary);
  box-shadow: var(--shadow-lg);
}

.project-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--light-bg);
  background-image: radial-gradient(var(--glass-border) 1px, transparent 1px);
  background-size: 16px 16px;
}

.project-thumb-placeholder i {
  font-size: 2.5rem;
  color: var(--text-muted);
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
}

.project-link {
  width: 44px;
  height: 44px;
  background: var(--dark-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.project-link:hover {
  background: var(--text-primary);
  color: var(--dark-bg);
  transform: scale(1.05);
}

.project-info {
  padding: var(--spacing-lg);
}

.project-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

/* ===== GOALS SECTION ===== */
.timeline-section {
  background: var(--light-bg);
  border-top: 1px solid var(--glass-border);
}

.goals-content {
  max-width: 1000px;
  margin: 0 auto;
}

.goals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.goal-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: left;
  transition: all var(--transition-normal);
}

.goal-item:hover {
  transform: translateY(-2px);
  border-color: var(--text-secondary);
}

.goal-item i {
  font-size: var(--font-size-3xl);
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  display: block;
}

.goal-item h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.goal-item p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--dark-bg);
  position: relative;
  padding: var(--spacing-2xl) 0;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border) 50%, transparent);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: var(--font-size-lg);
  color: var(--text-primary);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-note {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* ===== PROTECTED IMAGE (chặn lưu/kéo ảnh) ===== */
.protected-image {
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  -webkit-touch-callout: none; /* chặn menu long-press lưu ảnh trên iOS */
  -khtml-user-drag: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.footer-music-credit {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm, 8px);
  padding: 8px 18px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full, 999px);
  background: var(--glass-bg, rgba(255, 255, 255, 0.04));
  color: var(--text-secondary, var(--text-muted));
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: border-color var(--transition-normal), color var(--transition-normal), transform var(--transition-normal);
}

.footer-music-credit i:first-child {
  color: var(--accent-color);
}

.footer-music-credit i.fa-youtube {
  color: #ff0000;
  font-size: 1.05em;
}

.footer-music-credit strong {
  color: var(--text-primary);
  font-weight: 600;
}

.footer-music-credit:hover {
  border-color: var(--accent-color);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ===== CONTACT SECTION ===== */
.contact-section {
  background: var(--dark-bg);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.info-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.info-item i {
  font-size: var(--font-size-xl);
  color: var(--primary-color);
  width: 40px;
}

.info-item h4 {
  margin: 0 0 var(--spacing-xs);
  font-size: var(--font-size-base);
}

.info-item p {
  margin: 0;
  color: var(--text-secondary);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.social-link {
  width: 44px;
  height: 44px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition-normal);
  font-size: var(--font-size-lg);
}

.social-link:hover {
  background: var(--text-primary);
  color: var(--dark-bg);
  border-color: var(--text-primary);
  transform: translateY(-2px);
}

.contact-form {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
}

.form-group {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group label {
  position: absolute;
  left: var(--spacing-md);
  top: var(--spacing-md);
  color: var(--text-secondary);
  pointer-events: none;
  transition: all var(--transition-normal);
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
  top: -8px;
  left: var(--spacing-sm);
  font-size: var(--font-size-xs);
  background: var(--dark-bg);
  padding: 0 var(--spacing-xs);
  color: var(--primary-color);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-2xl);
  }

  .hero-image {
    order: 1;
  }

  .hero-text {
    order: 2;
    text-align: center;
  }

  .hero-slogan {
    display: block;
    border-left: none;
    padding-left: 0;
    text-align: center;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .timeline::before {
    left: 30px;
  }

  .timeline-marker {
    left: 30px;
  }

  .timeline-item:nth-child(even) .timeline-content,
  .timeline-item:nth-child(odd) .timeline-content {
    left: 80px;
    right: auto;
    text-align: left;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  #navbar {
    height: 70px;
  }

  .hero-section {
    align-items: center;
    padding-top: calc(70px + var(--spacing-2xl));
    padding-bottom: var(--spacing-3xl);
    min-height: calc(100vh - 70px);
  }

  .hero-content {
    min-height: auto;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-controls {
    gap: 0.4rem;
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .image-container {
    width: 250px;
    height: 250px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .skills-content {
    grid-template-columns: 1fr;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-marker {
    left: 20px;
  }

  .timeline-item:nth-child(even) .timeline-content,
  .timeline-item:nth-child(odd) .timeline-content {
    left: 50px;
  }

  .goals-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .image-container {
    width: 200px;
    height: 200px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .timeline-content {
    padding: var(--spacing-lg);
  }

  .contact-form {
    padding: var(--spacing-lg);
  }
}