/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --bg-2: #f4f4f4;
  --bg-3: #e8e8e8;
  --primary: #0f0f0f;
  --gray: #666666;
  --gray-light: #444444;
  --border: rgba(0,0,0,0.1);
  --accent: #0f0f0f;
  --accent-dim: rgba(0,0,0,0.06);
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--primary);
  font-family: var(--font);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #bbb; border-radius: 2px; }

/* ===== SELECTION ===== */
::selection { background: rgba(0,0,0,0.1); }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3 { line-height: 1.2; font-weight: 700; }
p { color: var(--gray-light); }

/* ===== LAYOUT ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

section {
  padding: 120px 0;
  position: relative;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 64px;
  text-align: center;
  letter-spacing: -0.02em;
}
.section-title span { color: var(--gray); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--primary);
  color: var(--bg);
}
.btn-primary:hover { background: #333333; transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: rgba(0,0,0,0.3); background: var(--accent-dim); }

.btn-full { width: 100%; justify-content: center; }

/* ===== NAV ===== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  transition: var(--transition);
}
#navbar.scrolled {
  background: rgba(255,255,255,0.5);
  backdrop-filter: blur(20px);
  padding: 14px 48px;
  border-bottom: 1px solid var(--border);
}

.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
}
.nav-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
  letter-spacing: 0.02em;
}
.nav-links a:hover,
.nav-links a.active { color: var(--primary); }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== HOME ===== */
#home {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0;
  overflow: hidden;
}

.home-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  position: relative;
  z-index: 1;
  padding: 0 2rem;
}

.home-greeting {
  color: var(--gray);
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.home-name {
  font-size: clamp(3rem, 6vw, 5rem);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  line-height: 1.05;
}
.home-name span { color: var(--gray); }

.home-role {
  font-size: 1.2rem;
  color: var(--gray-light);
  margin-bottom: 20px;
  min-height: 1.8em;
}
.typed-text { color: var(--primary); }
.cursor {
  color: var(--primary);
  animation: blink 1s infinite;
}
@keyframes blink { 0%,100% { opacity:1 } 50% { opacity:0 } }

.home-desc {
  font-size: 1.05rem;
  color: var(--gray);
  max-width: 500px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.home-cta { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }

#particleCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0.55;
}

.scroll-mouse {
  width: 22px;
  height: 34px;
  border: 2px solid var(--gray);
  border-radius: 11px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 5px;
}
.scroll-wheel {
  width: 3px;
  height: 6px;
  background: var(--gray);
  border-radius: 2px;
  animation: scrollWheel 1.8s ease-in-out infinite;
}
@keyframes scrollWheel {
  0%   { opacity: 1; transform: translateY(0); }
  75%  { opacity: 0; transform: translateY(10px); }
  100% { opacity: 0; transform: translateY(0); }
}

.scroll-chevrons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.scroll-chevrons span {
  display: block;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid var(--gray);
  border-bottom: 1.5px solid var(--gray);
  transform: rotate(45deg);
  animation: chevronPulse 1.6s ease-in-out infinite;
}
.scroll-chevrons span:nth-child(1) { animation-delay: 0s; }
.scroll-chevrons span:nth-child(2) { animation-delay: 0.18s; }
.scroll-chevrons span:nth-child(3) { animation-delay: 0.36s; }
@keyframes chevronPulse {
  0%, 100% { opacity: 0.15; }
  50%       { opacity: 0.9; }
}

/* ===== ABOUT ===== */
#about { background: var(--bg-2); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: center;
}

.about-img-frame {
  max-width: 380px;
  border-radius: 20px;
  overflow: hidden;
  position: relative;
}
.about-img-frame img {
  width: 100%;
  height: auto;
  display: block;
}
.about-img-frame::before {
  content: '';
  position: absolute;
  inset: 0;
}
.about-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  font-weight: 800;
  color: rgba(0,0,0,0.1);
  aspect-ratio: 1;
  min-height: 300px;
}

.about-info h3 {
  font-size: 1.8rem;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.about-info p {
  margin-bottom: 16px;
  line-height: 1.75;
}

.about-stats {
  display: flex;
  gap: 40px;
  margin: 36px 0;
}
.stat { display: flex; flex-direction: column; }
.stat-num { font-size: 2.5rem; font-weight: 800; color: var(--primary); line-height: 1; letter-spacing: -0.03em; }
.stat-label { font-size: 0.8rem; color: var(--gray); text-transform: uppercase; letter-spacing: 0.08em; margin-top: 4px; }

/* ===== EXPERIENCE ===== */
#experience { background: var(--bg); }

.timeline {
  position: relative;
  max-width: 780px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.timeline-item.visible { opacity: 1; transform: translateY(0); }

.timeline-dot {
  position: absolute;
  left: 10px;
  top: 24px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  background: var(--bg);
  transition: background var(--transition);
}
.timeline-item:hover .timeline-dot { background: var(--primary); }

.timeline-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: border-color var(--transition), transform var(--transition);
}
.timeline-card:hover {
  border-color: rgba(0,0,0,0.2);
  transform: translateX(4px);
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.timeline-card h3 {
  font-size: 1.25rem;
  margin: 8px 0 4px;
  letter-spacing: -0.01em;
}
.timeline-company {
  font-size: 0.9rem;
  color: var(--gray);
  margin-bottom: 12px;
}
.timeline-card > p { font-size: 0.95rem; line-height: 1.65; }

.timeline-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.timeline-tags span {
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--gray);
  letter-spacing: 0.02em;
}

/* ===== SERVICES ===== */
#services { background: var(--bg-2); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: border-color var(--transition), transform var(--transition);
  opacity: 0;
  transform: translateY(20px);
}
.service-card.visible { opacity: 1; transform: translateY(0); }
.service-card:hover {
  border-color: rgba(0,0,0,0.2);
  transform: translateY(-4px);
}

.service-icon {
  width: 52px;
  height: 52px;
  color: var(--primary);
  margin-bottom: 20px;
}
.service-icon img { width: 100%; height: 100%; }

.service-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.service-card p { font-size: 0.9rem; line-height: 1.65; }

/* ===== PROJECTS ===== */
#projects { background: var(--bg); }

.projects-filter {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 48px;
}
.filter-btn {
  padding: 8px 20px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--gray);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.02em;
}
.filter-btn.active,
.filter-btn:hover {
  background: var(--primary);
  color: var(--bg);
  border-color: var(--primary);
}

.projects-carousel-wrapper {
  display: flex;
  align-items: center;
  gap: 16px;
}

.projects-grid {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
  flex: 1;
  padding: 8px 2px 16px;
}
.projects-grid::-webkit-scrollbar { display: none; }

.carousel-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition), border-color var(--transition), opacity var(--transition);
}
.carousel-btn:hover {
  background: var(--bg-2);
}
.carousel-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

.project-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), opacity 0.4s;
  opacity: 0;
  transform: scale(0.97);
  flex: 0 0 380px;
  scroll-snap-align: start;
}
.project-card.visible { opacity: 1; transform: scale(1); }
.project-card.hidden { opacity: 0; transform: scale(0.95); pointer-events: none; display: none; }

.project-img {
  height: 180px;
  object-fit: fill;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.project-num { color: rgba(0,0,0,0.08); font-size: 3.5rem; font-weight: 800; letter-spacing: -0.04em; }

.project-info { padding: 24px; }
.project-tag {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray);
  display: block;
  margin-bottom: 8px;
}
.project-info h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.project-info p { font-size: 0.88rem; line-height: 1.6; margin-bottom: 16px; }

.project-links { display: flex; gap: 8px; flex-wrap: wrap; }
.project-link {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray);
  text-decoration: none;
  transition: var(--transition);
  flex-shrink: 0;
}
.project-link img { width: 16px; height: 16px; }

/* ===== CONTACT ===== */
#contact { background: var(--bg-2); padding: 220px 0; }

.contact-info {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.contact-info > p { margin-bottom: 36px; }

.contact-items { display: flex; flex-direction: column; gap: 16px; margin-bottom: 36px; align-items: center; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--gray-light);
  font-size: 0.9rem;
}
.contact-item img { width: 20px; height: 20px; color: var(--gray); flex-shrink: 0; }

.social-links { display: flex; gap: 16px; justify-content: center; }
.social-link {
  width: 34px;
  height: 34px;
  border-radius: 7px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray);
  transition: var(--transition);
  text-decoration: none;
}
.social-link img { width: 18px; height: 18px; }

/* ===== SHARED ICON-LINK HOVER ===== */
.icon-link {
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.icon-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
  border-color: rgba(0,0,0,0.2);
  color: var(--primary);
}

/* ===== REVEAL ANIMATION ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-img-frame { max-width: 320px; margin: 0 auto; }
}

@media (max-width: 768px) {
  #navbar { padding: 16px 24px; }
  #navbar.scrolled { padding: 12px 24px; }

  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 70vw;
    height: 100vh;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    transition: right var(--transition);
    border-left: 1px solid var(--border);
  }
  .nav-links.open { right: 0; }
  .nav-links a { font-size: 1.1rem; }

  .menu-toggle { display: flex; }

  .home-content { padding-top: 100px; }

  .services-grid { grid-template-columns: 1fr; }
  .projects-carousel-wrapper { gap: 8px; }
  .project-card { flex: 0 0 100%; }
  .carousel-btn { width: 36px; height: 36px; flex-shrink: 0; }
  .timeline::before { left: 12px; }
  .timeline-item { padding-left: 44px; }
  .timeline-dot { left: 4px; }

  section { padding: 80px 0; }
}