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

:root {
  --bg:          #0d0b09;
  --bg-card:     #171210;
  --bg-card-hover: #1f1814;
  --border:      rgba(255,255,255,0.07);
  --accent:      #f97316;
  --accent-2:    #fbbf24;
  --gradient:    linear-gradient(135deg, #f97316, #fbbf24);
  --text:        #f0ebe4;
  --text-muted:  #9a8878;
  --text-dim:    #5a4a3a;
  --radius:      12px;
  --radius-lg:   20px;
  --transition:  0.3s ease;
  --shadow:      0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(249,115,22,0.15);
}

/* ---- LIGHT MODE ---- */
[data-theme="light"] {
  --bg:          #f0e6d3;
  --bg-card:     #e8d9c0;
  --bg-card-hover: #deccab;
  --border:      rgba(0,0,0,0.10);
  --accent:      #c2410c;
  --accent-2:    #b45309;
  --gradient:    linear-gradient(135deg, #c2410c, #b45309);
  --text:        #1c1006;
  --text-muted:  #6b5540;
  --text-dim:    #9a7d62;
  --shadow:      0 8px 32px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 40px rgba(194,65,12,0.12);
}

[data-theme="light"] body {
  background: var(--bg);
}

[data-theme="light"] ::-webkit-scrollbar-track { background: #fff4e8; }
[data-theme="light"] ::-webkit-scrollbar-thumb { background: var(--accent); }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* =============================================
   SCROLLBAR
   ============================================= */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* =============================================
   BACKGROUND BLOBS
   ============================================= */
.bg-blobs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.12;
}

.blob-1 {
  width: 600px; height: 600px;
  background: #f97316;
  top: -200px; left: -200px;
  animation: float1 18s ease-in-out infinite;
}

.blob-2 {
  width: 500px; height: 500px;
  background: #fbbf24;
  bottom: -100px; right: -100px;
  animation: float2 22s ease-in-out infinite;
}

.blob-3 {
  width: 300px; height: 300px;
  background: #ef4444;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation: float3 15s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 80px) scale(1.1); }
}
@keyframes float2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-80px, -60px) scale(1.15); }
}
@keyframes float3 {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-45%, -55%) scale(1.2); }
}

/* =============================================
   LAYOUT WRAPPER
   ============================================= */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* =============================================
   NAV
   ============================================= */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: background var(--transition), backdrop-filter var(--transition);
}

nav.scrolled {
  background: rgba(11,11,19,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition);
  font-weight: 500;
}

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

/* Page nav links (Portfolio / CNN) */
.nav-page-link { font-size: 0.9rem; font-weight: 600; color: var(--text-muted); transition: color var(--transition); }
.nav-page-link:hover { color: var(--text); }
.nav-page-link.active { color: var(--accent); }

/* Portfolio subnav */

.nav-cta {
  padding: 8px 20px;
  background: var(--gradient);
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: white !important;
  transition: opacity var(--transition), transform var(--transition);
}

.nav-cta:hover { opacity: 0.85; transform: translateY(-1px); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* =============================================
   HERO
   ============================================= */
/* Legacy .hero kept for compatibility */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}
.hero-content { max-width: 750px; }

/* Merged hero-about section */
.hero-about {
  padding: 120px 0 80px;
}
.ha-header {
  margin-bottom: 60px;
  text-align: center;
}
.ha-header .hero-badge {
  margin: 16px auto 0;
  display: inline-flex;
  margin-bottom: 0;
}
.ha-tags {
  justify-content: center;
  margin-top: 20px;
}
.ha-header h1 {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  animation: fadeUp 0.6s ease both;
}
.ha-header h1 .gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ha-header .hero-title { animation: fadeUp 0.6s 0.1s ease both; margin-bottom: 0; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(249,115,22,0.1);
  border: 1px solid rgba(249,115,22,0.3);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 28px;
  animation: fadeUp 0.6s ease both;
}

.hero-badge::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  animation: fadeUp 0.6s 0.1s ease both;
}

.hero h1 .gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 24px;
  animation: fadeUp 0.6s 0.2s ease both;
}

.hero-title strong {
  color: var(--text);
  font-weight: 600;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  line-height: 1.8;
  margin-bottom: 40px;
  animation: fadeUp 0.6s 0.3s ease both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
  animation: fadeUp 0.6s 0.4s ease both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(249,115,22,0.4);
}

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

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-2px);
}

.btn-linkedin {
  background: #0a66c2;
  color: white;
  border-color: transparent;
}

.btn-linkedin:hover {
  background: #004182;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10,102,194,0.4);
}

.btn-soft {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-soft:hover {
  color: var(--accent);
  border-color: rgba(249,115,22,0.4);
  transform: translateY(-2px);
}

.hero-socials {
  display: flex;
  gap: 16px;
  animation: fadeUp 0.6s 0.5s ease both;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all var(--transition);
}

.social-link:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.2);
  background: var(--bg-card);
  transform: translateY(-2px);
}

.social-link svg { width: 18px; height: 18px; flex-shrink: 0; }

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

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 60px;
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* =============================================
   ABOUT
   ============================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 60px;
  align-items: center;
}

.about-image-wrap {
  position: relative;
}

.about-avatar {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  position: relative;
  overflow: hidden;
}

.about-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
}

/* Avatar crossfade */
.avatar-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transition: opacity 0.4s ease;
}
.avatar-cartoon { opacity: 1; }
.avatar-real    { opacity: 0; }

.about-avatar.reveal-real .avatar-cartoon { opacity: 0; }
.about-avatar.reveal-real .avatar-real    { opacity: 1; }

@media (hover: hover) {
  .about-avatar:hover .avatar-cartoon { opacity: 0; }
  .about-avatar:hover .avatar-real    { opacity: 1; }
}

.avatar-hint {
  position: absolute;
  bottom: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  background: rgba(0,0,0,0.45);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  opacity: 1;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 2;
}

.about-avatar-glow {
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--radius-lg) + 2px);
  background: var(--gradient);
  z-index: -1;
  opacity: 0.4;
  filter: blur(8px);
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.stat-card .stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card .stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.stat-card.wide {
  grid-column: 1 / -1;
}

.stat-card.wide .stat-value {
  font-size: 1.2rem;
}

.about-text h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.about-text p {
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 16px;
  font-size: 1rem;
}

.about-socials {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 16px;
}
.about-socials .social-link {
  justify-content: center;
  font-size: 0.82rem;
  padding: 8px 12px;
  border-radius: 8px;
}
.about-socials .social-link[href*="github"]   { background: var(--bg-card); border-color: rgba(36,41,46,0.4);   color: #8b949e; }
.about-socials .social-link[href*="linkedin"] { background: var(--bg-card); border-color: rgba(10,102,194,0.3);  color: #0a66c2; }
.about-socials .social-link[href*="kaggle"]   { background: var(--bg-card); border-color: rgba(32,189,200,0.3);  color: #20bdc8; }
.about-socials .social-link[href^="mailto"]   { background: var(--bg-card); border-color: rgba(249,115,22,0.3);  color: var(--accent); }
[data-theme="light"] .about-socials .social-link[href*="github"] { color: #24292e; }

.about-nav-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.tag {
  padding: 6px 14px;
  background: rgba(249,115,22,0.1);
  border: 1px solid rgba(249,115,22,0.25);
  border-radius: 100px;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 500;
}

/* =============================================
   SKILLS
   ============================================= */
.skills { background: rgba(255,255,255,0.01); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

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

.skill-category:hover {
  border-color: rgba(249,115,22,0.3);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.skill-cat-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
}

.skill-cat-title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-pill {
  padding: 5px 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text);
  font-weight: 500;
  transition: all var(--transition);
}

.skill-pill:hover {
  background: rgba(249,115,22,0.15);
  border-color: rgba(249,115,22,0.4);
  color: var(--accent);
}

/* =============================================
   PROJECTS
   ============================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
}

.project-card:hover {
  border-color: rgba(249,115,22,0.25);
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow), var(--shadow-glow);
}

.project-card:hover::before { opacity: 1; }

.project-card.featured {
  border-color: rgba(249,115,22,0.3);
  background: linear-gradient(135deg, rgba(249,115,22,0.05), rgba(251,191,36,0.03));
}

.project-card.featured::before { opacity: 0.6; }

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 14px;
}

.project-icon {
  font-size: 1.6rem;
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(249,115,22,0.1);
  border-radius: 10px;
  border: 1px solid rgba(249,115,22,0.2);
}

.project-links {
  display: flex;
  gap: 8px;
}

.project-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  transition: all var(--transition);
}

.project-link:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.05);
}

.project-link svg { width: 16px; height: 16px; }

.project-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.project-description {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 20px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-badge {
  padding: 4px 10px;
  background: rgba(251,191,36,0.08);
  border: 1px solid rgba(251,191,36,0.2);
  border-radius: 5px;
  font-size: 0.75rem;
  color: var(--accent-2);
  font-weight: 600;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.project-header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.featured-badge {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(249,115,22,0.12);
  border: 1px solid rgba(249,115,22,0.3);
  border-radius: 100px;
  padding: 3px 10px;
}

/* =============================================
   KAGGLE SECTION
   ============================================= */
.kaggle-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  gap: 40px;
  transition: all var(--transition);
}

.kaggle-wrap:hover {
  border-color: rgba(32,178,170,0.4);
  box-shadow: 0 0 40px rgba(32,178,170,0.1);
}

.kaggle-logo {
  font-size: 3.5rem;
  flex-shrink: 0;
}

.kaggle-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.kaggle-info p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.kaggle-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #20b2aa;
  font-weight: 600;
  font-size: 0.9rem;
  transition: gap var(--transition);
}

.kaggle-link:hover { gap: 12px; }

/* =============================================
   THREAD / BLOG FEED
   ============================================= */
.thread-feed {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
}

.thread-entry {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 0 20px;
  margin-bottom: 0;
}

.thread-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 6px;
}

.thread-dot {
  --dot-color: 249,115,22;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(var(--dot-color), 1);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 12px rgba(var(--dot-color), 0.5);
  transition: transform var(--transition), box-shadow var(--transition);
}

.thread-entry:hover .thread-dot {
  transform: scale(1.3);
  box-shadow: 0 0 20px rgba(var(--dot-color), 0.8);
}

.thread-line {
  width: 2px;
  flex: 1;
  min-height: 40px;
  background: linear-gradient(to bottom, rgba(249,115,22,0.4), rgba(251,191,36,0.15));
  margin-top: 6px;
  border-radius: 1px;
  transform-origin: top;
  transform: scaleY(0);
  transition: transform 0.6s ease;
}

.thread-entry.thread-visible .thread-line {
  transform: scaleY(1);
}

.thread-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 24px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.thread-content::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
}

.thread-entry:hover .thread-content {
  border-color: rgba(249,115,22,0.25);
  background: var(--bg-card-hover);
  transform: translateX(4px);
}

.thread-entry:hover .thread-content::before {
  opacity: 1;
}

.thread-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.thread-date {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.thread-tag {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(249,115,22,0.1);
  border: 1px solid rgba(249,115,22,0.2);
  border-radius: 100px;
  padding: 2px 10px;
}

.thread-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.thread-body {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.thread-content.collapsed .thread-body {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0;
}

.thread-content.collapsed .note-image,
.thread-content.collapsed .thread-footer {
  display: none;
}

.thread-chevron {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}
.thread-chevron::after { content: '▼'; }
.thread-content:not(.collapsed) .thread-chevron { transform: rotate(180deg); }

.thread-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.thread-tag-pill {
  padding: 3px 10px;
  background: rgba(251,191,36,0.07);
  border: 1px solid rgba(251,191,36,0.15);
  border-radius: 5px;
  font-size: 0.75rem;
  color: var(--accent-2);
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
}

@media (max-width: 480px) {
  .thread-entry {
    grid-template-columns: 28px 1fr;
    gap: 0 14px;
  }
  .thread-content { padding: 18px 20px; }
}

/* =============================================
   THEME TOGGLE BUTTON
   ============================================= */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--bg-card);
  border-color: rgba(249,115,22,0.4);
  color: var(--accent);
  transform: rotate(15deg);
}

.lang-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: all var(--transition);
  flex-shrink: 0;
}

.lang-toggle:hover {
  background: var(--bg-card);
  border-color: rgba(249,115,22,0.4);
  color: var(--accent);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon { width: 18px; height: 18px; }

/* dark mode → show sun (to switch to light) */
.icon-sun  { display: block; }
.icon-moon { display: none; }

/* light mode → show moon (to switch to dark) */
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* Light mode: nav + cards need explicit bg */
[data-theme="light"] nav.scrolled {
  background: rgba(240,230,211,0.92);
  border-bottom-color: rgba(0,0,0,0.10);
}

[data-theme="light"] .mobile-menu {
  background: rgba(240,230,211,0.98);
}

[data-theme="light"] .blob { opacity: 0.07; }

/* =============================================
   NAV ACTIVE LINK
   ============================================= */
.nav-links a.active { color: var(--text); }

/* =============================================
   CONTACT
   ============================================= */
.contact { text-align: center; }

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  max-width: 640px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--gradient);
}

.contact-card p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 36px;
}

.contact-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* =============================================
   FOOTER
   ============================================= */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

footer span {
  color: var(--accent);
}

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =============================================
   MOBILE NAV MENU
   ============================================= */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(11,11,19,0.98);
  backdrop-filter: blur(20px);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: color var(--transition);
}

.mobile-menu a:hover { color: var(--text); }
.mobile-menu a.mobile-page-active { color: var(--accent); }


/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }

  .hero { padding: 100px 0 60px; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image-wrap { max-width: 420px; margin: 0 auto; }

  .kaggle-wrap {
    flex-direction: column;
    text-align: center;
    gap: 24px;
  }

  .contact-card { padding: 40px 24px; }

  .hero-socials { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .projects-grid {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    gap: 16px;
    padding-bottom: 12px;
  }
  .projects-grid::-webkit-scrollbar { height: 4px; }
  .projects-grid::-webkit-scrollbar-track { background: transparent; }
  .projects-grid::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
  .projects-grid .project-card {
    flex: 0 0 82vw;
    max-width: 340px;
    scroll-snap-align: start;
  }
  .skills-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .btn { justify-content: center; }
}

/* =============================================
   NAV CNN LINK
   ============================================= */
.nav-cnn { color: var(--text-muted); }
.nav-cnn:hover { color: var(--text); }

/* =============================================
   EXPERIENCE TABS
   ============================================= */
.exp-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.exp-tab {
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
}

.exp-tab:hover {
  border-color: rgba(249,115,22,0.4);
  color: var(--text);
}

.exp-tab.active {
  background: var(--accent);
  border-color: transparent;
  color: white;
  box-shadow: 0 4px 16px rgba(249,115,22,0.42);
}

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

/* =============================================
   TIMELINE
   ============================================= */
.tl-entry {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 0 20px;
  margin-bottom: 0;
}

.tl-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 22px;
}

.tl-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--gradient);
  flex-shrink: 0;
  z-index: 1;
  box-shadow: 0 0 10px rgba(249,115,22,0.4);
  transition: transform var(--transition), box-shadow var(--transition);
}

.tl-entry:hover .tl-dot {
  transform: scale(1.3);
  box-shadow: 0 0 18px rgba(249,115,22,0.7);
}

.tl-line {
  width: 2px;
  flex: 1;
  min-height: 32px;
  background: linear-gradient(to bottom, rgba(249,115,22,0.35), rgba(251,191,36,0.1));
  margin-top: 6px;
  border-radius: 1px;
}

.tl-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.tl-card:hover, .tl-card.open {
  border-color: rgba(249,115,22,0.3);
  box-shadow: var(--shadow-glow);
}

.tl-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px 16px;
  cursor: pointer;
  user-select: none;
}

.tl-header-left { flex: 1; }

.tl-period {
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 4px;
}

.tl-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.tl-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tl-chevron {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform var(--transition);
  margin-top: 2px;
}

.tl-card.open .tl-chevron { transform: rotate(180deg); }

.tl-short {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 0 24px 18px;
  line-height: 1.6;
  margin: 0;
}

.tl-card.open .tl-short { display: none; }

.tl-detail {
  border-top: 1px solid var(--border);
  padding: 24px;
  animation: fadeUp 0.25s ease;
}

.tl-detail-badge {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(249,115,22,0.1);
  border: 1px solid rgba(249,115,22,0.25);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 18px;
}

.tl-detail-section {
  margin-bottom: 18px;
}

.tl-detail-section h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.tl-detail-section p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.tl-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
  margin-bottom: 16px;
}

.tl-doc-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  background: var(--gradient);
  color: white;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: opacity var(--transition), transform var(--transition);
}

.tl-doc-btn:hover { opacity: 0.85; transform: translateY(-1px); }

.tl-doc-btn + .tl-doc-btn { margin-left: 10px; }

/* =============================================
   PROJECT FILTERS
   ============================================= */
.project-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.filter-pill {
  --pill-color: 249,115,22;
  padding: 8px 18px;
  background: rgba(var(--pill-color), 0.08);
  border: 1px solid rgba(var(--pill-color), 0.25);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
  box-shadow: 0 2px 10px rgba(var(--pill-color), 0.18);
}

.filter-pill:hover {
  border-color: rgba(var(--pill-color), 0.45);
  color: var(--text);
  box-shadow: 0 2px 14px rgba(var(--pill-color), 0.32);
}

.filter-pill.active {
  background: rgba(var(--pill-color), 1);
  border-color: transparent;
  color: white;
  box-shadow: 0 4px 16px rgba(var(--pill-color), 0.42);
}

/* Notes timeline — shared */
.notes-timeline { padding: 4px 0 24px; }
.ntl-vertical { display: none; }

/* Vertical timeline (mobile) */
.ntl-vertical {
  position: relative;
  padding-left: 24px;
}
.ntl-vertical::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
  border-radius: 1px;
}
.ntlv-group { margin-bottom: 4px; }
.ntlv-year {
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-dim);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 12px 0 6px -20px;
}
.ntlv-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 5px 8px 5px 0;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  margin-bottom: 2px;
}
.ntlv-item:hover { background: var(--bg-card); }
.ntlv-dot {
  --dot-color: 249,115,22;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgb(var(--dot-color));
  box-shadow: 0 0 6px rgba(var(--dot-color), 0.45);
  flex-shrink: 0;
  margin-top: 3px;
  position: relative;
  left: -19px;
  margin-right: -10px;
}
.ntlv-content {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.ntlv-title {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}
.ntlv-date {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.ntl-track {
  position: relative;
  height: 44px;
  display: flex;
  align-items: center;
}
.ntl-axis {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: var(--border);
  border-radius: 1px;
}
.ntl-dot {
  --dot-color: 249,115,22;
  position: absolute;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: rgba(var(--dot-color), 1);
  box-shadow: 0 0 7px rgba(var(--dot-color), 0.5);
  transform: translateX(-50%);
  cursor: pointer;
  transition: transform .18s, box-shadow .18s;
  z-index: 2;
}
.ntl-dot:hover {
  transform: translateX(-50%) scale(1.5);
  box-shadow: 0 0 16px rgba(var(--dot-color), 0.75);
  z-index: 10;
}
.ntl-tip {
  display: none;
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  min-width: 150px;
  max-width: 220px;
  pointer-events: none;
  z-index: 20;
  box-shadow: 0 4px 18px rgba(0,0,0,0.22);
  flex-direction: column;
  gap: 3px;
}
.ntl-dot:hover .ntl-tip { display: flex; }
.ntl-dot.ntl-left .ntl-tip  { left: 0;   transform: none; }
.ntl-dot.ntl-right .ntl-tip { left: auto; right: 0; transform: none; }
.ntl-tip-title { font-size: 0.76rem; font-weight: 600; color: var(--text); white-space: normal; line-height: 1.3; }
.ntl-tip-date  { font-size: 0.67rem; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; }
.ntl-years {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  padding-top: 4px;
}

/* project extra fields */
.proj-category-label {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 6px;
}

.proj-period {
  margin-top: 14px;
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-dim);
}

/* =============================================
   THREAD LINK (notes)
   ============================================= */
.thread-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  background: rgba(249,115,22,0.08);
  border: 1px solid rgba(249,115,22,0.2);
  border-radius: 5px;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
  transition: all var(--transition);
}
.thread-link:hover {
  background: rgba(249,115,22,0.15);
  transform: translateY(-1px);
}

/* ── SECTION INDEX (cnn / llm tabs) ── */
.tab-panel section { scroll-margin-top: 88px; }
.section-index {
  max-width: var(--container-width, 1100px);
  margin: 0 auto;
  padding: 20px var(--container-pad, 24px) 0;
}
.section-idx-title {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 0 8px;
}
.section-idx-list {
  margin: 0;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  list-style: none;
  counter-reset: idx-counter;
}
.section-idx-list li {
  counter-increment: idx-counter;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
}
.section-idx-list li:last-child { border-bottom: none; }
.section-idx-list li::before {
  content: counter(idx-counter);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 16px;
}
.section-idx-link {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .15s;
  line-height: 1.4;
}
.section-idx-link:hover { color: var(--text); }

/* ── NOTES PAGINATION ── */
.notes-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 28px 0 8px;
}
.notes-page-btn {
  padding: 7px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.notes-page-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}
.notes-page-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.notes-page-edge {
  padding: 7px 12px;
  font-size: 0.88rem;
}
.notes-page-info {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  min-width: 52px;
  text-align: center;
}

/* ── NOTES TIMELINE TOGGLE (mobile) ── */
.ntlv-toggle { display: none; }
.ntlv-toggle svg { transition: transform 0.2s; flex-shrink: 0; }

/* ── NOTES FILTERS ── */
.notes-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

/* Notes feed: full container width, no side constraint */
.thread-feed { max-width: 100%; }

.thread-entry {
  grid-template-columns: 36px 1fr;
  gap: 0 24px;
}

.note-image {
  width: 100%;
  border-radius: 10px;
  margin: 14px 0;
  border: 1px solid var(--border);
  display: block;
}

/* =============================================
   SECTION PADDING MOBILE
   ============================================= */
@media (max-width: 768px) {
  section { padding: 64px 0; }

  /* Footer: enlace de vuelta en línea propia */
  .footer-back { display: block; margin-bottom: 6px; }
  .footer-sep { display: none; }

  /* Timeline de notas: versión vertical en móvil */
  .ntl-horizontal { display: none; }
  .ntl-vertical { display: block; }

  /* Toggle del índice de notas en móvil */
  .ntlv-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 8px 2px;
    background: none;
    border: none;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 2px;
  }
  .ntlv-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
  .ntlv-body { display: none; }
  .ntlv-body.open { display: block; }
  .ntl-vertical::before { display: none; }

  /* Filtros: fila horizontal deslizable */
  .exp-tabs,
  .project-filters,
  .notes-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }
  .exp-tabs::-webkit-scrollbar,
  .project-filters::-webkit-scrollbar,
  .notes-filters::-webkit-scrollbar { display: none; }

  .exp-tab { padding: 7px 14px; font-size: 0.82rem; white-space: nowrap; flex-shrink: 0; }
  .filter-pill { white-space: nowrap; flex-shrink: 0; }

  .tl-header { padding: 16px 18px 12px; }
  .tl-short { padding: 0 18px 14px; }
  .tl-detail { padding: 18px; }
}