@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@300;400;700;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg-gradient: linear-gradient(135deg, #ffffff 0%, #f0f0f0 100%);
  --bg: #fafafa;
  --text: #111111;
  --text-muted: #666666;
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(0, 0, 0, 0.05);
  --accent: #000000;
  --accent-hover: #333333;
  --shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.08);
  --blur: blur(16px);
  --icon-filter: none;
}

body[data-theme="dark"] {
  --bg-gradient: linear-gradient(135deg, #1a0505 0%, #0a0101 100%);
  --bg: #140303;
  --text: #fdf2f2;
  --text-muted: #e59f9f;
  --card-bg: rgba(30, 5, 5, 0.45);
  --card-border: rgba(255, 255, 255, 0.08);
  --accent: #dc2626;
  --accent-hover: #ef4444;
  --shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.4);
  --icon-filter: brightness(0) invert(1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 400;
  background-image: var(--bg-gradient);
  background-color: var(--bg);
  background-attachment: fixed;
  color: var(--text);
  transition: background 0.5s ease, color 0.5s ease;
  line-height: 1.7;
  min-height: 100vh;
}

body.theme-transition,
body.theme-transition *,
body.theme-transition *::before,
body.theme-transition *::after {
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Merriweather', serif;
  font-weight: 700;
  color: var(--text);
  margin-top: 0;
  letter-spacing: -0.04em;
}

strong {
  font-weight: 600;
  font-family: 'Merriweather', serif;
  font-size: 0.9em;
  letter-spacing: 0.02em;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-hover);
}

.topbar {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  background: var(--card-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.topbar-brand h1 {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  margin: 0;
}

.topbar-actions {
  display: flex;
  align-items: center;
  width: 100%;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  width: 100%;
}

.tab-btn {
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--text-muted);
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: 'Merriweather', serif;
  border-radius: 99px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-btn:hover {
  color: var(--text);
  background: rgba(128, 128, 128, 0.1);
}

.tab-btn.active {
  background-color: var(--accent);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.symbol-input {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: var(--blur);
  color: var(--text);
  font-size: 1.25rem;
  text-align: center;
  outline: none;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  font-family: inherit;
  padding: 0;
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.symbol-input:focus, .symbol-input:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  border-color: var(--accent);
}

#theme-toggle {
  border: none;
  background-color: var(--card-bg);
  backdrop-filter: var(--blur);
  color: var(--text);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: all 0.3s ease;
  border: 1px solid var(--card-border);
}

#theme-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.theme-icon {
  width: 22px;
  height: 22px;
  transition: filter 0.5s ease;
}

.container {
  max-width: 800px;
  margin: 3rem auto;
  padding: 0 1.5rem;
  display: grid;
  gap: 1.5rem;
  position: relative;
}

.card {
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  padding: 2.5rem;
  border-radius: 24px;
  box-shadow: var(--shadow);
  opacity: 1;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.tab-panel.entering {
  animation: panelFadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.tab-panel.leaving {
  animation: panelFadeOut 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes panelFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.tab-panel.entering > * {
  animation: elementPopUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.tab-panel.entering > *:nth-child(1) { animation-delay: 0.05s; }
.tab-panel.entering > *:nth-child(2) { animation-delay: 0.1s; }
.tab-panel.entering > *:nth-child(3) { animation-delay: 0.15s; }
.tab-panel.entering > *:nth-child(4) { animation-delay: 0.2s; }
.tab-panel.entering > *:nth-child(5) { animation-delay: 0.25s; }
.tab-panel.entering > *:nth-child(6) { animation-delay: 0.3s; }
.tab-panel.entering > *:nth-child(7) { animation-delay: 0.35s; }

@keyframes elementPopUp {
  0% {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes panelFadeOut {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-10px) scale(0.98);
  }
}

.hero {
  text-align: center;
  padding: 4rem 2rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.profile-pic-wrap {
  position: relative;
  display: inline-block;
  margin-bottom: 1rem;
}

.profile-hat {
  position: absolute;
  left: 50%;
  top: -20px;
  transform: translateX(-50%) rotate(-15deg);
  font-size: 2.5rem;
  z-index: 2;
  pointer-events: none;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0% { transform: translateX(-50%) rotate(-15deg) translateY(0); }
  50% { transform: translateX(-50%) rotate(-15deg) translateY(-8px); }
  100% { transform: translateX(-50%) rotate(-15deg) translateY(0); }
}

.profile-pic {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--bg);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.profile-pic-wrap:hover .profile-pic {
  transform: scale(1.05) rotate(5deg);
}

.khmer-mark {
  margin: 0 0 0.5rem 0;
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.9;
  font-family: 'Merriweather', serif;
}

.hero h2 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  margin-bottom: 0.5rem;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 400;
  margin-bottom: 2rem;
  color: var(--text);
}

.section-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  filter: var(--icon-filter);
  opacity: 0.8;
}

.achievement-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.achievement-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: rgba(128, 128, 128, 0.03);
  border-radius: 16px;
  border: 1px solid var(--card-border);
  transition: transform 0.3s ease, background 0.3s ease;
}

.achievement-item:hover {
  transform: translateX(5px);
  background: rgba(128, 128, 128, 0.05);
}

.achievement-icon {
  width: 20px;
  height: 20px;
  margin-top: 0.2rem;
  filter: var(--icon-filter);
  opacity: 0.7;
}

ul {
  padding-left: 1.5rem;
  color: var(--text-muted);
}

li {
  margin-bottom: 0.5rem;
}

li strong {
  color: var(--text);
}

.tags {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.interest-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: rgba(128, 128, 128, 0.05);
  border: 1px solid var(--card-border);
  border-radius: 99px;
  font-size: 0.85rem;
  color: var(--text);
  transition: all 0.3s ease;
  font-family: 'Merriweather', serif;
  font-weight: 500;
}

.interest-tag:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.interest-tag:hover .interest-icon {
  filter: brightness(0) invert(1);
}

.interest-icon {
  width: 16px;
  height: 16px;
  filter: var(--icon-filter);
  opacity: 0.7;
  transition: filter 0.3s ease;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 0;
  background: rgba(128, 128, 128, 0.03);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s ease;
  overflow: hidden;
}

.project-thumbnail {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-bottom: 1px solid var(--card-border);
  transition: opacity 0.3s ease;
}

.project-content {
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
  flex-grow: 1;
}

.project-card:hover {
  transform: translateY(-4px);
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.1);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.project-card:hover p {
  color: rgba(255, 255, 255, 0.9);
}

.project-card:hover .project-icon {
  filter: brightness(0) invert(1);
}

.project-card:hover .project-tags span {
  background: rgba(255, 255, 255, 0.2);
}

.project-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.project-header h4 {
  margin: 0;
  font-family: 'Merriweather', serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: inherit;
}

.project-icon {
  width: 24px;
  height: 24px;
  filter: var(--icon-filter);
  transition: all 0.3s ease;
}

.project-card p {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 1rem 0;
  flex-grow: 1;
  transition: all 0.3s ease;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-tags span {
  font-family: 'Merriweather', serif;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: rgba(128, 128, 128, 0.1);
  border-radius: 99px;
  transition: all 0.3s ease;
}

.socials {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.socials li {
  margin: 0;
}

.socials a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: rgba(128, 128, 128, 0.03);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  color: var(--text);
  transition: all 0.3s ease;
}

.socials a:hover {
  background: var(--accent);
  color: #ffffff;
  transform: translateY(-2px);
}

.socials a:hover .social-icon {
  filter: brightness(0) invert(1);
}

.social-icon {
  width: 18px;
  height: 18px;
  filter: var(--icon-filter);
  opacity: 0.7;
  transition: filter 0.3s ease;
}

.socials strong {
  margin-right: 0.25rem;
}

/* Base icon filtering for dark mode applied via CSS variables mostly, but cover edge cases */
body[data-theme="dark"] .theme-icon {
  filter: var(--icon-filter);
}

.footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 2rem;
  font-family: 'Merriweather', serif;
}

.cursor-star {
  position: fixed;
  left: 0;
  top: 0;
  pointer-events: none;
  user-select: none;
  z-index: 9999;
  font-size: 1rem;
  opacity: 0;
  will-change: transform, opacity;
}

.card:hover,
#theme-toggle:hover,
.tab-btn:hover,
.symbol-input:hover,
.symbol-input:focus,
.interest-tag:hover,
.socials a:hover,
.achievement-item:hover,
.profile-pic-wrap:hover .profile-pic {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.pinned-photo {
  float: right;
  position: relative;
  width: 150px;
  margin: 0 0 1.5rem 1.5rem; 
  background: #fff;
  padding: 8px 8px 24px 8px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.2);
  z-index: 10;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

body[data-theme="dark"] .pinned-photo {
  background: #e2e2e2;
}

.pinned-photo:hover {
  transform: scale(1.05);
  z-index: 50;
  cursor: pointer;
}

.pinned-photo img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
}

.pinned-photo .pin {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.8rem;
  z-index: 15;
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.4));
  pointer-events: none;
}

@media (max-width: 768px) {
  .topbar {
    padding: 1rem;
  }
  
  .container {
    margin: 1.5rem auto;
  }

  .card {
    padding: 1.5rem;
  }

  .hero h2 {
    font-size: 2rem;
  }

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

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

  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.5rem;
    scrollbar-width: none; /* Firefox */
  }

  .tabs::-webkit-scrollbar {
    display: none; /* Safari and Chrome */
  }

  .tab-btn {
    white-space: nowrap;
    flex-shrink: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}