/* ═══════════════════════════════════════
   Variables & Reset
   ═══════════════════════════════════════ */
:root {
  --bg: #0a0a0f;
  --bg-secondary: #12121a;
  --surface: #1a1a2e;
  --border: #2a2a3e;
  --text: #e0e0e8;
  --text-muted: #8888a0;
  --accent: #6c5ce7;
  --accent-glow: rgba(108, 92, 231, 0.3);
  --accent2: #00cec9;
  --gradient: linear-gradient(135deg, var(--accent), var(--accent2));
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Pretendard', -apple-system, sans-serif;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) var(--bg);
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  cursor: none;
}

::selection {
  background: var(--accent);
  color: white;
}

a { color: inherit; text-decoration: none; cursor: none; }
button { cursor: none; }

/* ═══════════════════════════════════════
   Cursor Glow
   ═══════════════════════════════════════ */
.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  opacity: 0.4;
  transition: opacity 0.3s;
  mix-blend-mode: screen;
}

.cursor-dot {
  position: fixed;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  pointer-events: none;
  z-index: 10000;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 6px var(--accent);
}

/* ═══════════════════════════════════════
   Particle Canvas
   ═══════════════════════════════════════ */
#particleCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ═══════════════════════════════════════
   Navigation
   ═══════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 3rem;
  backdrop-filter: blur(20px);
  background: rgba(10, 10, 15, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  transform: translateY(-100%);
  animation: navSlideIn 0.6s ease forwards;
  animation-delay: 4.5s;
}

@keyframes navSlideIn {
  to { transform: translateY(0); }
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.accent { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2.5rem;
  position: relative;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color 0.3s;
  padding: 0.3rem 0;
}

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

.nav-indicator {
  position: absolute;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  transition: left 0.3s ease, width 0.3s ease;
  border-radius: 2px;
}

/* ═══════════════════════════════════════
   Hero / Terminal
   ═══════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.terminal {
  width: min(700px, 90vw);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.5), 0 0 40px var(--accent-glow);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #28c840; }

.terminal-title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.8;
}

.terminal-line {
  opacity: 0;
  transform: translateY(10px);
  animation: terminalFadeIn 0.4s ease forwards;
}

.terminal-line.output {
  padding-left: 1.2rem;
  color: var(--accent2);
}

@keyframes terminalFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.prompt {
  color: var(--accent);
  margin-right: 0.5rem;
}

.cmd {
  color: var(--text);
}

.blink-text {
  animation: textBlink 1.5s ease infinite;
}

@keyframes textBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* Scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: 5s;
}

.scroll-mouse {
  width: 26px;
  height: 42px;
  border: 2px solid var(--text-muted);
  border-radius: 13px;
  position: relative;
}

.scroll-wheel {
  width: 4px;
  height: 10px;
  background: var(--accent);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 2s ease infinite;
}

@keyframes scrollWheel {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(14px); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════════════════════
   Sections (shared)
   ═══════════════════════════════════════ */
.section {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
  max-width: 300px;
}

.title-number {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  font-weight: 400;
}

/* ═══════════════════════════════════════
   Reveal Animations
   ═══════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.4s ease-out,
              transform 0.4s ease-out;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  transform: translateX(-60px) translateY(0);
}
.reveal-left.revealed {
  transform: translateX(0) translateY(0);
}

.reveal-right {
  transform: translateX(60px) translateY(0);
}
.reveal-right.revealed {
  transform: translateX(0) translateY(0);
}

/* ═══════════════════════════════════════
   About Section
   ═══════════════════════════════════════ */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-greeting {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.about-text p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.about-text strong {
  color: var(--text);
}

.tech-stack-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  border: 1px solid rgba(108, 92, 231, 0.3);
  border-radius: 8px;
  transition: all 0.3s;
}

.tech-stack-link:hover {
  background: rgba(108, 92, 231, 0.15);
  border-color: var(--accent);
  transform: translateX(4px);
}

.about-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-plus {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  font-family: var(--font-mono);
}

/* Code window */
.code-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.code-filename {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.code-content {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.9;
  overflow-x: auto;
}

.code-keyword { color: #c792ea; }
.code-var { color: #82aaff; }
.code-key { color: var(--accent2); }
.code-string { color: #c3e88d; }
.code-bool { color: #f78c6c; }

/* ═══════════════════════════════════════
   Skills Section
   ═══════════════════════════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.skill-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.2s;
  transform-style: preserve-3d;
  will-change: transform;
}

.skill-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 30px var(--accent-glow);
}

.skill-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.skill-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.skill-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.7rem;
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid rgba(108, 92, 231, 0.2);
  border-radius: 6px;
  color: var(--accent);
  transition: background 0.3s, transform 0.2s;
}

.skill-tag.dim {
  background: rgba(136, 136, 160, 0.08);
  border-color: rgba(136, 136, 160, 0.15);
  color: var(--text-muted);
}

.skill-tag:hover {
  background: rgba(108, 92, 231, 0.2);
  transform: translateY(-2px);
}

.skill-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  background: var(--gradient);
  border-radius: 2px;
  width: 0%;
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skill-fill.animate {
  width: var(--fill-width);
}

/* ═══════════════════════════════════════
   Projects Section
   ═══════════════════════════════════════ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  transform-style: preserve-3d;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px var(--accent-glow);
}

.project-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(
    135deg,
    hsla(var(--hue), 50%, 20%, 0.15),
    transparent
  );
}

.project-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(
    135deg,
    hsl(var(--hue), 60%, 45%),
    hsl(var(--hue), 80%, 30%)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.project-icon svg {
  width: 20px;
  height: 20px;
  color: white;
}

.project-header-link {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  padding: 0.3rem 0.7rem;
  border: 1px solid rgba(108, 92, 231, 0.3);
  border-radius: 6px;
  transition: all 0.3s;
}

.project-header-link:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.project-info {
  padding: 1.5rem;
}

.project-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.project-info h3 {
  font-size: 1.2rem;
  margin: 0.5rem 0;
}

.project-info p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  background: rgba(0, 206, 201, 0.1);
  border-radius: 4px;
  color: var(--accent2);
}

/* ═══════════════════════════════════════
   Subsection Title
   ═══════════════════════════════════════ */
.subsection-title {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1.5rem;
  margin-top: 1rem;
}

/* ═══════════════════════════════════════
   Other Projects (list)
   ═══════════════════════════════════════ */
.other-projects {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 1rem;
}

.other-project-category h4 {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent2);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.other-project-list {
  list-style: none;
}

.other-project-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(42, 42, 62, 0.4);
  font-size: 0.85rem;
  transition: transform 0.2s, color 0.2s;
}

.other-project-list li:hover {
  transform: translateX(6px);
  color: var(--accent);
}

.other-project-list li strong {
  color: var(--text);
}

.other-project-list li span {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.other-project-list li:last-child {
  border-bottom: none;
}

/* ═══════════════════════════════════════
   Career / Timeline
   ═══════════════════════════════════════ */
.year-tabs,
.project-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.year-tab,
.project-tab {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.6rem 1.5rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  transition: all 0.3s;
}

.year-tab:hover,
.project-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.year-tab.active,
.project-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.career-extra {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.career-chip {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem 1.2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.career-chip:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.career-chip-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.career-chip strong {
  font-size: 0.88rem;
  display: block;
}

.career-chip a {
  transition: color 0.3s;
}

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

.career-chip-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline.hidden {
  display: none;
}

.timeline-item {
  position: relative;
  margin-bottom: 1.5rem;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 1.2rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  z-index: 1;
  transition: background 0.3s, box-shadow 0.3s;
}

.timeline-item:hover .timeline-dot {
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem 1.5rem;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.timeline-item:hover .timeline-content {
  border-color: var(--accent);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.timeline-content h3 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.timeline-content h3 a {
  transition: color 0.3s;
}

.timeline-content h3 a:hover {
  color: var(--accent);
}

.timeline-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.timeline-client {
  font-family: var(--font-mono);
  font-size: 0.75rem !important;
  color: var(--accent2) !important;
  margin-bottom: 0.2rem;
}

.timeline-platform {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.timeline-platform.soop {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.timeline-platform.chzzk {
  background: rgba(0, 206, 100, 0.15);
  color: #4ade80;
  border: 1px solid rgba(0, 206, 100, 0.3);
}

.timeline-platform.both {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

/* Project card hidden state for filtering */
.project-card.card-hidden {
  display: none;
}

/* ═══════════════════════════════════════
   Contact Section
   ═══════════════════════════════════════ */
.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-text {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 2.5rem;
  background: transparent;
  border: 2px solid var(--accent);
  border-radius: 12px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.contact-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: -1;
}

.contact-btn:hover {
  color: white;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 10px 40px var(--accent-glow);
}

.contact-btn:hover::before {
  opacity: 1;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 3rem;
}

.social-link {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.3s;
}

.social-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px var(--accent-glow);
}

.contact-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.discord-btn {
  border-color: #5865F2;
  color: #5865F2;
}

.discord-btn::before {
  background: linear-gradient(135deg, #5865F2, #7289da);
}

.contact-info-row {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.contact-info-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ═══════════════════════════════════════
   Footer
   ═══════════════════════════════════════ */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ═══════════════════════════════════════
   Responsive
   ═══════════════════════════════════════ */
@media (max-width: 768px) {
  .cursor-glow { display: none; }
  body { cursor: auto; }
  a, button { cursor: auto; }

  .nav { padding: 1rem 1.5rem; }
  .nav-links { gap: 1.2rem; }
  .nav-link { font-size: 0.75rem; }

  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-stats { gap: 1rem; }

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

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

  .career-extra {
    flex-direction: column;
  }

  .section-title { font-size: 1.5rem; }
  .section { padding: 80px 0; }

  .terminal-body { font-size: 0.78rem; padding: 16px; }
}

@media (max-width: 480px) {
  .nav-links { display: none; }
  .about-stats { flex-direction: column; }
  .skills-grid { grid-template-columns: 1fr; }
  .project-tabs { flex-wrap: wrap; }
}