/* ============================================
   PORTFOLIO - Dark Theme | Zero Dependencies
   ============================================ */

/* --- Reset & Variables --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #161616;
  --bg-card-hover: #1a1a1a;
  --bg-elevated: #1e1e1e;

  --text-primary: #e8e8e8;
  --text-secondary: #888888;
  --text-muted: #555555;

  --accent: #00d4aa;
  --accent-dim: #00d4aa33;
  --accent-glow: #00d4aa22;

  --border: #222222;
  --border-light: #2a2a2a;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Selection --- */
::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 8px 20px !important;
  border: 1px solid var(--accent) !important;
  border-radius: var(--radius-sm);
  color: var(--accent) !important;
}

.nav-cta:hover {
  background: var(--accent) !important;
  color: var(--bg-primary) !important;
}

.nav-cta::after {
  display: none !important;
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 64px;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,170,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,170,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero-name {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

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

.hero-role {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.typed-prefix {
  color: var(--accent);
  margin-right: 6px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-desc strong {
  color: var(--text-primary);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 48px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-sans);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: #00e6b8;
  box-shadow: 0 0 20px var(--accent-dim);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  border-color: var(--text-secondary);
  background: var(--bg-card);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 40px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Hero Image */
.hero-image {
  display: flex;
  justify-content: center;
}

.hero-image-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
}

.hero-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border);
  position: relative;
  z-index: 1;
}

.hero-image-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  z-index: 0;
  filter: blur(40px);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.scroll-indicator span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

/* ============================================
   SKILLS
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

.skill-category:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

.skill-category-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill-icon {
  color: var(--accent);
  font-size: 0.7rem;
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.skill-item:hover {
  border-color: var(--accent-dim);
  color: var(--text-primary);
}

.skill-item img {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

/* ============================================
   TIMELINE (Work Experience)
   ============================================ */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--border-light) 10%, var(--border-light) 90%, transparent);
}

.timeline-item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 40px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -4px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-dim);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.timeline-card:hover {
  border-color: var(--border-light);
}

.timeline-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

.company-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.company-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.job-title {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 2px;
}

.job-period {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.timeline-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), padding 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 0 24px;
}

.timeline-card.open .timeline-body {
  max-height: 500px;
  padding: 0 24px 24px;
}

.timeline-card.open .timeline-header {
  border-bottom-color: var(--border-light);
}

.achievement-list {
  margin-bottom: 16px;
}

.achievement-list li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
  margin-bottom: 6px;
}

.achievement-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.6;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.tech-tags span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 10px;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 999px;
}

.link-external {
  font-size: 0.85rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.link-external:hover {
  gap: 8px;
}

/* ============================================
   PROJECTS
   ============================================ */
.project-group-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 48px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  display: block;
}

.project-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-img {
  height: 160px;
  overflow: hidden;
  background: var(--bg-elevated);
}

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

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

.project-info {
  padding: 16px;
}

.project-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.project-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.project-links {
  display: flex;
  gap: 12px;
}

.project-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  padding: 4px 0;
  position: relative;
}

.project-links a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: var(--transition);
}

.project-links a:hover::after {
  width: 100%;
}

/* ============================================
   CERTIFICATES
   ============================================ */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.cert-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.cert-img {
  height: 200px;
  overflow: hidden;
  background: var(--bg-elevated);
}

.cert-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cert-info {
  padding: 20px;
}

.cert-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.cert-info p {
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.cert-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ============================================
   CONTACT
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 700px;
  margin: 0 auto;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  display: block;
}

.contact-card:hover {
  border-color: var(--accent-dim);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.contact-icon {
  width: 36px;
  height: 36px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  transition: var(--transition);
}

.contact-card:hover .contact-icon {
  color: var(--accent);
}

.contact-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.contact-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
}

.footer-text {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-logo {
  font-family: var(--font-mono);
  color: var(--accent);
}

/* ============================================
   ANIMATIONS (Scroll Reveal)
   ============================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-image-wrapper {
    width: 240px;
    height: 240px;
    margin: 0 auto;
  }

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

  .contact-grid {
    grid-template-columns: 1fr;
    max-width: 320px;
  }

  .scroll-indicator {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-toggle {
    display: flex;
  }

  .section {
    padding: 60px 0;
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 1.4rem;
  }

  .timeline::before {
    left: 0;
  }

  .timeline-item {
    padding-left: 28px;
  }

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

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

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

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

  .hero-stats {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
}