:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --surface: rgba(33, 38, 45, 0.6);
  --border-color: #30363d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --heading-primary: #f0f6fc;
  --accent-primary: #2dd4bf;
  --accent-secondary: #14b8a6;
  --accent-glow: rgba(45, 212, 191, 0.3);
  --danger: #f85149;
  --success: #3fb950;
  --font-heading: "Exo 2", sans-serif;
  --font-body: "Roboto Mono", monospace;
  --border-radius: 12px;
  --transition-fast: all 0.2s ease-in-out;
  --transition-slow: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --surface: rgba(225, 228, 232, 0.6);
  --border-color: #d0d7de;
  --text-primary: #24292f;
  --text-secondary: #57606a;
  --heading-primary: #1f2328;
  --accent-primary: #14b8a6;
  --accent-secondary: #0f766e;
  --accent-glow: rgba(20, 184, 166, 0.2);
  --success: #1a7f37;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}
h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--heading-primary);
}
h1 {
  font-size: clamp(2.8rem, 7vw, 4.5rem);
}
h2 {
  font-size: clamp(2rem, 6vw, 3rem);
  text-align: center;
  margin-bottom: 4rem;
  position: relative;
}
h3 {
  font-size: 1.5rem;
}
h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--accent-secondary),
    var(--accent-primary)
  );
  margin: 1rem auto 0;
  border-radius: 2px;
}
a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: var(--transition-fast);
}
a:hover {
  filter: brightness(1.2);
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}
section {
  padding: 6rem 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition-fast);
  border: 2px solid transparent;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 1rem;
}
.btn-primary {
  background-color: var(--accent-secondary);
  color: white;
}
.btn-primary:hover {
  background-color: var(--accent-primary);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px var(--accent-glow);
}
.btn-outline {
  background-color: transparent;
  color: var(--accent-primary);
  border-color: var(--accent-secondary);
}
.btn-outline:hover {
  background-color: var(--surface);
  color: var(--accent-primary);
  transform: translateY(-3px);
}
.tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  background-color: rgba(45, 212, 191, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(45, 212, 191, 0.2);
}
[data-theme="light"] .tag {
  background-color: rgba(20, 184, 166, 0.1);
  border-color: rgba(20, 184, 166, 0.2);
}
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.stagger-children > * {
  transition-delay: calc(0.15s * var(--stagger-index));
}

#music-prompt-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
#music-prompt-overlay.visible {
  opacity: 1;
  pointer-events: all;
}
#music-prompt-modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 2.5rem;
  width: 90%;
  max-width: 450px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  transform: scale(0.95);
  transition: transform 0.3s ease;
}
#music-prompt-overlay.visible #music-prompt-modal {
  transform: scale(1);
}
#music-prompt-modal h3 {
  margin-bottom: 1rem;
  color: var(--heading-primary);
}
#music-prompt-modal p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}
.prompt-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.5rem 0;
  transition: all 0.3s ease-in-out;
}
.header.scrolled {
  background-color: var(--surface);
  backdrop-filter: blur(10px);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
}
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.75rem;
  color: var(--heading-primary);
}
.logo span {
  color: var(--accent-primary);
}
.nav-list {
  display: flex;
  list-style: none;
  gap: 2rem;
}
.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  letter-spacing: 1px;
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: var(--accent-primary);
  transition: var(--transition-fast);
}
.nav-link:hover,
.nav-link.active {
  color: var(--accent-primary);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
  margin-right: 1.5rem;
}
.theme-toggle-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  transition: var(--transition-fast);
  padding: 0.5rem;
  line-height: 1;
  cursor: pointer;
}
.theme-toggle-btn:hover {
  color: var(--accent-primary);
  transform: rotate(15deg);
}
.mobile-nav-toggle {
  display: none;
}

/* --- HERO --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-image: linear-gradient(
      to right,
      var(--border-color) 1px,
      transparent 1px
    ),
    linear-gradient(to bottom, var(--border-color) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.2;
  animation: moveGrid 20s linear infinite;
}
@keyframes moveGrid {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 40px 40px;
  }
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}
.hero-subtitle {
  color: var(--accent-primary);
  font-family: var(--font-body);
  font-size: 1.1rem;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}
.hero-title {
  margin-bottom: 1.5rem;
  text-shadow: 0 0 20px var(--accent-glow);
}
.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin: 0 auto 2.5rem;
  max-width: 700px;
}
.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.typing-container {
  min-height: 48px;
}
.cursor {
  display: inline-block;
  width: 10px;
  height: 1.2rem;
  background-color: var(--accent-primary);
  animation: blink 1s infinite;
  margin-left: 5px;
  vertical-align: bottom;
}
@keyframes blink {
  50% {
    opacity: 0;
  }
}

.approach {
  padding: 4rem 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}
.approach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  text-align: center;
}
.approach-card {
  padding: 2rem;
}
.approach-card i {
  font-size: 2.5rem;
  color: var(--accent-primary);
  margin-bottom: 1rem;
}
.approach-card h3 {
  margin-bottom: 1rem;
}
.approach-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.about,
.projects,
.comments-section,
.policy-section#privacy {
  background-color: var(--bg-secondary);
}
.toolbox,
.achievements,
.contact,
.policy-section#tos {
  background-color: var(--bg-primary);
}
.about-container {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 4rem;
  align-items: center;
}
.about-image-wrapper {
  position: relative;
}
.about-image {
  width: 100%;
  border-radius: var(--border-radius);
  display: block;
  border: 2px solid var(--border-color);
  transition: var(--transition-slow);
}
.about-image-wrapper:hover .about-image {
  transform: scale(1.03);
  box-shadow: 0 0 30px var(--accent-glow);
}
.about-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.about-content strong {
  color: var(--text-primary);
  font-weight: 500;
}
.toolbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}
.skill-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem 1rem;
  text-align: center;
  transition: var(--transition-fast);
}
.skill-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-secondary);
  box-shadow: 0 0 15px var(--accent-glow);
}
.skill-card i {
  font-size: 3rem;
  color: var(--accent-primary);
  margin-bottom: 1rem;
}
.skill-card span {
  font-size: 1rem;
  font-weight: 500;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}
.project-card,
.achievement-card {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition-slow);
  backdrop-filter: blur(5px);
  display: flex;
  flex-direction: column;
  height: 100%;
}
.project-card {
  cursor: pointer;
}
.project-card:hover,
a.achievement-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.3), 0 0 25px var(--accent-glow);
  border-color: var(--accent-primary);
}
.card-image {
  height: 200px;
  overflow: hidden;
}
.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.project-card:hover .card-image img,
a.achievement-card:hover .card-image img {
  transform: scale(1.05);
}
.card-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}
.card-title {
  margin-bottom: 0.5rem;
  color: var(--heading-primary);
}
.card-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}
.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.project-links {
  margin-top: auto;
}
.btn-fake {
  color: var(--accent-primary);
  font-weight: 500;
}
a.achievement-card {
  text-decoration: none;
}
.achievement-source {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.contact-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.contact-description {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}
#terminal-container {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  margin: 0 auto 3rem;
  height: 350px;
  overflow-y: auto;
  font-family: var(--font-body);
  font-size: 0.95rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  text-align: left;
}
#terminal-output {
  white-space: pre-wrap;
  word-break: break-all;
}
.terminal-line {
  margin-bottom: 0.5rem;
}
.terminal-prompt {
  color: var(--success);
  margin-right: 0.5rem;
}
.terminal-command {
  color: var(--text-primary);
}
.terminal-response {
  color: var(--text-secondary);
}
#terminal-input-line {
  display: flex;
  align-items: center;
}
#terminal-input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  flex-grow: 1;
  outline: none;
}
.terminal-cursor-input {
  display: inline-block;
  width: 9px;
  height: 1.1rem;
  background-color: var(--accent-primary);
  animation: blink 1s infinite;
  margin-left: 2px;
}
.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}
.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--surface);
  color: var(--text-primary);
  font-size: 1.25rem;
  transition: var(--transition-fast);
  border: 1px solid var(--border-color);
}
.social-icon:hover {
  color: white;
  background-color: var(--accent-secondary);
  transform: translateY(-5px);
  box-shadow: 0 5px 15px var(--accent-glow);
}
.social-links-wrapper {
  margin-top: 2rem;
}

.policy-section {
  padding-top: 4rem;
  padding-bottom: 4rem;
}
.policy-container {
  max-width: 800px;
}
.policy-content {
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}
.policy-content h3 {
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}
.policy-content p,
.policy-content li {
  font-size: 1rem;
  line-height: 1.8;
}
.policy-content .last-updated {
  text-align: center;
  font-style: italic;
  margin-bottom: 3rem;
  font-size: 0.9rem;
}
.policy-content code {
  background-color: var(--bg-primary);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--accent-primary);
}

.footer {
  text-align: center;
  padding: 2rem 0;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}
.footer-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.footer-links {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  gap: 2rem;
}
.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.footer-links a:hover {
  color: var(--accent-primary);
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 2rem 2.5rem;
  width: 90%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.95);
  transition: transform 0.3s ease;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}
.modal-overlay.active .modal-content {
  transform: scale(1);
}
.modal-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  background: none;
  border: none;
  font-size: 2.5rem;
  color: var(--text-secondary);
  line-height: 1;
  cursor: pointer;
}
.modal-close:hover {
  color: var(--heading-primary);
}
.modal-title {
  margin-bottom: 1.5rem;
}
.modal-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.modal-content h4 {
  margin-top: 1.5rem;
  margin-bottom: 1rem;
}
.modal-content ul {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
}
.modal-content li {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.modal-content li i {
  color: var(--success);
  margin-top: 5px;
}

.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background-color: var(--accent-secondary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  z-index: 999;
  opacity: 0;
  transform: translateY(100px);
}
.scroll-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}
.scroll-to-top:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 25px var(--accent-glow);
}

@media (max-width: 768px) {
  .header-controls {
    margin-right: 0.5rem;
  }
  .mobile-nav-toggle {
    display: block;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    z-index: 1001;
    cursor: pointer;
  }
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(80%, 350px);
    height: 100vh;
    background-color: var(--bg-secondary);
    flex-direction: column;
    justify-content: center;
    padding: 2rem;
    transition: right 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 1000;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
  }
  .nav.active {
    right: 0;
  }
  .nav-list {
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }
  .nav-link {
    font-size: 1.2rem;
  }
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  .btn {
    width: 100%;
    max-width: 280px;
  }
  .about-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .about-image-wrapper {
    order: -1;
  }
  .scroll-to-top {
    bottom: 1rem;
    right: 1rem;
  }
}