/* ============================================================
   Ajaya Vishvakarma Portfolio — Main Stylesheet
   Premium dark/light theme | Inter font | Responsive
   ============================================================ */

/* ─── RESET & BASE ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }

/* ─── CSS CUSTOM PROPERTIES ─────────────────────────────────── */
[data-theme="dark"] {
  --bg:            #06060f;
  --bg-surface:    #0d0d18;
  --bg-card:       #12121f;
  --bg-card-hover: #191928;
  --border:        rgba(255,255,255,0.07);
  --border-hover:  rgba(255,255,255,0.15);

  --accent:        #6366f1;
  --accent-hover:  #4f46e5;
  --accent-2:      #a855f7;
  --accent-3:      #22d3ee;
  --accent-glow:   rgba(99,102,241,0.25);
  --accent-glow2:  rgba(168,85,247,0.2);

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;

  --success: #22c55e;
  --warning: #f59e0b;
  --error:   #ef4444;

  --gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
  --gradient-hero: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(99,102,241,0.3), transparent);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 40px rgba(99,102,241,0.2);
  --shadow-glow:  0 0 60px rgba(99,102,241,0.15);
}

[data-theme="light"] {
  --bg:            #f8fafc;
  --bg-surface:    #ffffff;
  --bg-card:       #f1f5f9;
  --bg-card-hover: #e2e8f0;
  --border:        rgba(0,0,0,0.08);
  --border-hover:  rgba(0,0,0,0.16);

  --accent:        #4f46e5;
  --accent-hover:  #3730a3;
  --accent-2:      #7c3aed;
  --accent-3:      #0891b2;
  --accent-glow:   rgba(79,70,229,0.15);
  --accent-glow2:  rgba(124,58,237,0.1);

  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #94a3b8;

  --success: #16a34a;
  --warning: #d97706;
  --error:   #dc2626;

  --gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
  --gradient-hero: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(79,70,229,0.1), transparent);
  --shadow-card: 0 2px 16px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 32px rgba(79,70,229,0.15);
  --shadow-glow:  0 0 60px rgba(79,70,229,0.08);
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
}

/* ─── TYPOGRAPHY ────────────────────────────────────────────── */
.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

code, .mono {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.875em;
}

/* ─── LAYOUT ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 100px;
  padding: 4px 14px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ─── BUTTONS ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--accent-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent-glow);
  transform: translateY(-2px);
}

.btn-full { width: 100%; justify-content: center; padding: 14px; }

/* ─── NAVBAR ────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(6,6,15,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

[data-theme="light"] .navbar.scrolled {
  background: rgba(248,250,252,0.85);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 2px;
}
.logo-bracket { color: var(--accent); }
.logo-text { color: var(--text-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 8px;
  transition: all 0.2s ease;
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: var(--bg-card);
}
.nav-link.active { color: var(--accent); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  width: 38px; height: 38px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.theme-toggle:hover {
  background: var(--bg-card-hover);
  color: var(--accent);
}

.btn-resume {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.3);
  padding: 7px 14px;
  border-radius: 8px;
  transition: all 0.2s ease;
}
.btn-resume:hover {
  background: var(--accent);
  color: #fff;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px; height: 38px;
  padding: 8px;
}
.nav-hamburger span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 68px; left: 0; right: 0; bottom: 0;
  background: var(--bg-surface);
  z-index: 999;
  padding: 32px 24px;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  border-top: 1px solid var(--border);
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu ul { display: flex; flex-direction: column; gap: 4px; }
.mobile-link {
  display: block;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 12px 16px;
  border-radius: 10px;
  transition: all 0.2s;
}
.mobile-link:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

/* ─── HERO ──────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 68px;
}

#particles-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.5;
}

.hero-bg-gradient {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}
.hero-bg-gradient::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 200px;
  background: linear-gradient(transparent, var(--bg));
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 80px 24px 60px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--success);
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.25);
  border-radius: 100px;
  padding: 5px 14px;
  margin-bottom: 28px;
}
.badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(1.3); }
}

.hero-name {
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-role {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 24px;
  min-height: 2em;
}
.role-prefix {
  color: var(--accent);
  font-weight: 700;
}
.typewriter {
  color: var(--text-primary);
  font-weight: 600;
}
.cursor-blink {
  color: var(--accent);
  animation: blink 1s infinite;
}
@keyframes blink { 0%,49% { opacity: 1; } 50%,100% { opacity: 0; } }

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
  line-height: 1.7;
}
.hero-tagline strong { color: var(--text-primary); }

.hero-metrics {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
  margin-bottom: 40px;
  padding: 24px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: fit-content;
  max-width: 100%;
  backdrop-filter: blur(8px);
}

.hero-metric {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 24px;
}
.metric-num {
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.metric-plus { font-size: 1.5rem; font-weight: 700; color: var(--accent); vertical-align: super; }
.metric-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-align: center;
  line-height: 1.3;
}
.hero-metric-divider {
  width: 1px;
  height: 44px;
  background: var(--border);
  flex-shrink: 0;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.hero-social {
  display: flex;
  gap: 12px;
}
.social-link {
  width: 42px; height: 42px;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1rem;
  transition: all 0.2s ease;
}
.social-link:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-3px);
}

.scroll-indicator {
  position: absolute;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: float 3s ease-in-out infinite;
  z-index: 1;
}
.scroll-mouse {
  width: 20px; height: 32px;
  border: 2px solid var(--text-muted);
  border-radius: 10px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 5px;
}
.scroll-wheel {
  width: 3px; height: 6px;
  background: var(--text-muted);
  border-radius: 2px;
  animation: scroll-wheel 2s infinite;
}
@keyframes float { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(-8px); } }
@keyframes scroll-wheel { 0% { opacity: 1; transform: translateY(0); } 100% { opacity: 0; transform: translateY(10px); } }

/* ─── ABOUT ─────────────────────────────────────────────────── */
.about { background: var(--bg-surface); }

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

.about-lead {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-text strong { color: var(--text-primary); }

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.highlight-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.highlight-item i {
  width: 40px; height: 40px;
  flex-shrink: 0;
  border-radius: 10px;
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 0.9rem;
}
.highlight-item div { display: flex; flex-direction: column; gap: 2px; }
.highlight-item strong { font-size: 0.9rem; color: var(--text-primary); }
.highlight-item span  { font-size: 0.8rem; color: var(--text-secondary); }

.about-card-stack {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.about-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.about-stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.3s;
}
.about-stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.about-stat-card:hover::before { opacity: 1; }

.stat-icon { font-size: 1.25rem; color: var(--accent); margin-bottom: 8px; }
.stat-value {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}
.stat-value span { font-size: 1.1rem; color: var(--accent); }
.stat-label { font-size: 0.72rem; color: var(--text-muted); margin-top: 6px; line-height: 1.3; }

.about-tech-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 12px;
  transition: all 0.2s;
}
.tech-tag.primary {
  color: var(--accent);
  background: var(--accent-glow);
  border-color: rgba(99,102,241,0.25);
}
.tech-tag:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ─── SKILLS ────────────────────────────────────────────────── */
.skills { background: var(--bg); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  transition: all 0.3s ease;
}
.skill-group:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.skill-group-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}
.skill-group-icon {
  width: 44px; height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1rem;
}
.skill-group-header h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.skill-group-header span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.skill-tags { display: flex; flex-wrap: wrap; gap: 7px; }

.skill-tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
}
.skill-tag.level-expert {
  background: rgba(99,102,241,0.12);
  color: #818cf8;
  border-color: rgba(99,102,241,0.25);
}
.skill-tag.level-advanced {
  background: rgba(168,85,247,0.1);
  color: #c084fc;
  border-color: rgba(168,85,247,0.2);
}
.skill-tag.level-intermediate {
  background: var(--bg);
  color: var(--text-secondary);
  border-color: var(--border);
}

[data-theme="light"] .skill-tag.level-expert {
  background: rgba(79,70,229,0.08);
  color: var(--accent);
  border-color: rgba(79,70,229,0.2);
}
[data-theme="light"] .skill-tag.level-advanced {
  background: rgba(124,58,237,0.08);
  color: var(--accent-2);
  border-color: rgba(124,58,237,0.15);
}

.skills-legend {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.8rem;
}
.skills-legend > span { display: flex; align-items: center; gap: 8px; }

/* ─── PROJECTS ──────────────────────────────────────────────── */
.projects { background: var(--bg-surface); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  position: relative;
}
.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.project-card.featured-card {
  border-color: rgba(99,102,241,0.3);
  box-shadow: 0 4px 32px rgba(99,102,241,0.12);
}
.project-card.featured-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient);
}

.project-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 0;
}

.project-platforms { display: flex; flex-wrap: wrap; gap: 6px; }
.platform-badge {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid transparent;
}
.platform-badge.android-tv  { background: rgba(61,220,151,0.1);  color: #3ddc97; border-color: rgba(61,220,151,0.2); }
.platform-badge.android      { background: rgba(61,220,151,0.08); color: #3ddc97; border-color: rgba(61,220,151,0.15); }
.platform-badge.firetv       { background: rgba(255,153,0,0.1);  color: #ff9900; border-color: rgba(255,153,0,0.2); }
/* Domain badges for Android Mobile card */
.platform-badge.tizen,
.platform-badge.domain       { background: rgba(99,102,241,0.1);  color: #818cf8; border-color: rgba(99,102,241,0.25); }

.project-featured-tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.3);
  padding: 3px 10px;
  border-radius: 6px;
}

.project-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; gap: 12px; }

.project-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.project-subtitle {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.project-impact {
  display: flex;
  gap: 16px;
  padding: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  flex-wrap: wrap;
}
.impact-item { display: flex; flex-direction: column; gap: 2px; }
.impact-value {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
}
.impact-label { font-size: 0.68rem; color: var(--text-muted); }

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.project-stack span {
  font-size: 0.72rem;
  font-weight: 500;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 3px 10px;
  border-radius: 6px;
}

.project-card-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.btn-case-study {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap 0.2s;
}
.btn-case-study:hover { gap: 12px; }

/* ─── EXPERIENCE ────────────────────────────────────────────── */
.experience { background: var(--bg); }

.timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 48px;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: 12px;
  top: 6px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--border);
  transition: all 0.3s;
}
.timeline-marker.current {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: all 0.3s ease;
}
.timeline-item:hover .timeline-content {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card);
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.timeline-date {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}
.timeline-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 100px;
}
.timeline-badge.current-role {
  background: rgba(34,197,94,0.12);
  color: var(--success);
  border: 1px solid rgba(34,197,94,0.25);
}
.timeline-duration {
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 6px;
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.timeline-company {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.timeline-achievements {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
  padding-left: 0;
}
.timeline-achievements li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}
.timeline-achievements li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.timeline-achievements li strong { color: var(--text-primary); }

.timeline-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.timeline-stack span {
  font-size: 0.7rem;
  font-weight: 500;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 5px;
}

/* ─── SYSTEM DESIGN ─────────────────────────────────────────── */
.system-design { background: var(--bg-surface); }

.system-tabs {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 40px;
}
.sys-tab {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 20px;
  border-radius: 100px;
  transition: all 0.2s ease;
}
.sys-tab:hover { color: var(--text-primary); }
.sys-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.diagram-panel { display: none; }
.diagram-panel.active { display: block; }

.arch-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  margin-bottom: 24px;
  overflow-x: auto;
}

.arch-layer {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.arch-layer-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  min-width: 120px;
  white-space: nowrap;
}
.arch-nodes { display: flex; flex-wrap: wrap; gap: 10px; flex: 1; }
.arch-node {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  line-height: 1.4;
}
.arch-node.accent {
  background: var(--accent-glow);
  border-color: rgba(99,102,241,0.3);
  color: var(--accent);
}
.arch-node small {
  display: block;
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 2px;
}
.arch-node.small { padding: 6px 12px; }
.arch-arrows {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.25rem;
  padding: 6px 0;
}

/* DRM flow */
.drm-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 0;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  margin-bottom: 24px;
  overflow-x: auto;
}
.drm-step {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  min-width: 160px;
}
.drm-step-num {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}
.drm-step h4 { font-size: 0.875rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.drm-step p  { font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; }
.drm-step code { background: var(--bg-card); padding: 1px 5px; border-radius: 4px; font-size: 0.68rem; }
.drm-arrow { color: var(--accent); font-size: 1.5rem; padding: 0 8px; }

/* Multi-platform */
.platform-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  margin-bottom: 24px;
}
.platform-core {
  background: var(--bg);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  margin-bottom: 24px;
}
.platform-core-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}
.core-modules { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.core-modules span {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.25);
  padding: 4px 12px;
  border-radius: 8px;
}
.platform-adapters { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.platform-adapter {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  transition: all 0.3s;
}
.platform-adapter:hover { border-color: var(--border-hover); transform: translateY(-2px); }
.adapter-icon { font-size: 1.75rem; margin-bottom: 8px; }
.platform-adapter.android .adapter-icon { color: #3ddc97; }
.platform-adapter.tizen  .adapter-icon { color: #4a90e2; }
.platform-adapter.webos  .adapter-icon { color: #e60012; }
.platform-adapter h4 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.platform-adapter ul { display: flex; flex-direction: column; gap: 4px; }
.platform-adapter li { font-size: 0.75rem; color: var(--text-secondary); }

/* Arch metrics strip */
.arch-metrics {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.arch-metric { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.arch-metric span { font-size: 0.72rem; color: var(--text-muted); }
.arch-metric strong { font-size: 1.25rem; font-weight: 900; color: var(--accent); }

/* ─── PERFORMANCE METRICS ───────────────────────────────────── */
.metrics { background: var(--bg); }
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  transition: all 0.3s;
}
.metric-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.metric-card canvas { margin: 0 auto 16px; max-width: 140px; }
.metric-card h4 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.metric-card p  { font-size: 0.775rem; color: var(--text-secondary); line-height: 1.5; }

/* ─── BLOG ──────────────────────────────────────────────────── */
.blog { background: var(--bg-surface); }

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all 0.3s ease;
}
.blog-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.blog-card-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.2);
  padding: 3px 10px;
  border-radius: 6px;
  width: fit-content;
}

.blog-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.blog-card-title a:hover { color: var(--accent); }

.blog-card-excerpt {
  font-size: 0.845rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.blog-card-meta span { display: flex; align-items: center; gap: 5px; }
.blog-card-meta i { color: var(--accent-2); }

.blog-card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.blog-card-tags span {
  font-size: 0.68rem;
  font-weight: 500;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 5px;
}

.blog-cta { text-align: center; }

/* ─── RESUME SECTION ────────────────────────────────────────── */
.resume-section { background: var(--bg); }

.resume-card {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-surface));
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 24px;
  overflow: hidden;
  position: relative;
}
.resume-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 10% 50%, rgba(99,102,241,0.12), transparent);
}

.resume-card-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 48px;
  flex-wrap: wrap;
}

.resume-icon {
  font-size: 3rem;
  color: var(--accent);
  flex-shrink: 0;
  width: 80px; height: 80px;
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.resume-text { flex: 1; min-width: 240px; }
.resume-text h2 { font-size: 1.75rem; font-weight: 800; color: var(--text-primary); margin-bottom: 8px; }
.resume-text p { color: var(--text-secondary); margin-bottom: 16px; }
.resume-details { display: flex; flex-wrap: wrap; gap: 16px; }
.resume-details span {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.resume-details i { color: var(--success); }

.resume-actions { display: flex; flex-direction: column; gap: 12px; flex-shrink: 0; }

/* ─── CONTACT ───────────────────────────────────────────────── */
.contact { background: var(--bg-surface); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  align-items: start;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 24px;
}
.contact-icon {
  width: 44px; height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: var(--accent-glow);
  border: 1px solid rgba(99,102,241,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1rem;
}
.contact-item h4 { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 4px; }
.contact-item a, .contact-item span { font-size: 0.9rem; color: var(--text-primary); transition: color 0.2s; }
.contact-item a:hover { color: var(--accent); }

.contact-availability {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--success);
  font-weight: 600;
  margin-top: 32px;
  padding: 12px 16px;
  background: rgba(34,197,94,0.08);
  border: 1px solid rgba(34,197,94,0.2);
  border-radius: 10px;
}
.avail-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse-dot 2s infinite;
}

/* Form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.form-group:last-of-type { margin-bottom: 0; }

label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

input[type="text"],
input[type="email"],
textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: all 0.2s ease;
  width: 100%;
  outline: none;
}
input::placeholder, textarea::placeholder { color: var(--text-muted); }
input:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
textarea { resize: vertical; }

.form-feedback {
  margin-top: 12px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 8px;
  padding: 0;
  min-height: 0;
  transition: all 0.3s;
}
.form-feedback.success {
  color: var(--success);
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.2);
  padding: 10px 14px;
}
.form-feedback.error {
  color: var(--error);
  background: rgba(239,68,68,0.08);
  border: 1px solid rgba(239,68,68,0.2);
  padding: 10px 14px;
}

/* ─── FOOTER ────────────────────────────────────────────────── */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 16px 0 20px;
  line-height: 1.6;
}
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: all 0.2s;
}
.footer-social a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.footer-nav h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.footer-nav ul { display: flex; flex-direction: column; gap: 8px; }
.footer-nav li, .footer-nav a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer-nav a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ─── ANIMATIONS (Intersection Observer) ────────────────────── */
[data-aos] {
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-aos="fade-up"]    { transform: translateY(30px); }
[data-aos="fade-down"]  { transform: translateY(-30px); }
[data-aos="fade-left"]  { transform: translateX(30px); }
[data-aos="fade-right"] { transform: translateX(-30px); }
[data-aos="zoom-in"]    { transform: scale(0.92); }
[data-aos].aos-animate  { opacity: 1; transform: none; }

/* Delay helpers */
[data-aos-delay="0"]   { transition-delay: 0ms; }
[data-aos-delay="50"]  { transition-delay: 50ms; }
[data-aos-delay="100"] { transition-delay: 100ms; }
[data-aos-delay="150"] { transition-delay: 150ms; }
[data-aos-delay="200"] { transition-delay: 200ms; }
[data-aos-delay="250"] { transition-delay: 250ms; }
[data-aos-delay="300"] { transition-delay: 300ms; }
[data-aos-delay="400"] { transition-delay: 400ms; }
[data-aos-delay="500"] { transition-delay: 500ms; }
[data-aos-delay="600"] { transition-delay: 600ms; }

/* ─── RESPONSIVE ────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid  { grid-template-columns: 1fr; gap: 48px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid  { grid-template-columns: 1fr 1fr; }
  .drm-flow {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .drm-arrow { transform: rotate(90deg); text-align: center; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .section-header { margin-bottom: 40px; }

  .nav-links { display: none; }
  .btn-resume { display: none; }
  .nav-hamburger { display: flex; }

  .hero-name { font-size: clamp(2.75rem, 12vw, 4.5rem); }
  .hero-metrics {
    gap: 8px;
    padding: 16px;
    justify-content: center;
  }
  .hero-metric { padding: 0 12px; }
  .hero-metric-divider { display: none; }

  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .about-card-stack { grid-template-columns: 1fr 1fr; }
  .platform-adapters { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .resume-card-content { flex-direction: column; padding: 32px; }
  .resume-actions { flex-direction: row; flex-wrap: wrap; }
  .system-tabs { flex-wrap: wrap; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-content { padding: 64px 16px 40px; }
  .hero-metrics { width: 100%; }
  .about-card-stack { grid-template-columns: 1fr; }
}

/* ─── PRINT STYLES ──────────────────────────────────────────── */
@media print {
  .navbar, .scroll-indicator, .hero-social, .hero-cta { display: none; }
  .hero { min-height: auto; padding: 32px 0; }
  .section { padding: 40px 0; }
}