/* ============================================================
   PORTFOLIO V2.0 — Design System (Vanilla CSS)
   Replaces Tailwind Browser CDN with hand-crafted styles.
   Preserves: Dark theme, glassmorphism, cyan/emerald gradient.
   ============================================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  --color-primary: #0ea5e9;
  --color-primary-dark: #0284c7;
  --color-secondary: #10b981;
  --color-secondary-dark: #059669;
  --color-dark: #0f172a;
  --color-darker: #0b1121;
  --color-surface: #1e293b;
  --color-surface-glass: rgba(30, 41, 59, 0.7);
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-subtle: rgba(255, 255, 255, 0.06);
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-text-dim: #64748b;
  --color-indigo: #6366f1;
  --color-purple: #a855f7;
  --color-pink: #ec4899;
  --color-red: #ef4444;
  --color-orange: #f97316;
  --color-yellow: #eab308;
  --color-green: #22c55e;
  --color-violet: #8b5cf6;
  --color-teal: #14b8a6;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --shadow-glow-primary: 0 0 20px rgba(14, 165, 233, 0.3);
  --shadow-glow-secondary: 0 0 20px rgba(16, 185, 129, 0.3);
  --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.5);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;
  --radius-full: 9999px;
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-dark);
  color: var(--color-text);
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

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

ul,
ol {
  list-style: none;
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* --- Focus States (Accessibility) --- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px;
}

@media (min-width: 640px) {
  .container {
    padding: 0 24px;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 32px;
  }
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: fixed;
  width: 100%;
  z-index: 50;
  background: var(--color-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base), background var(--transition-base);
}

.navbar.scrolled {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
  background: rgba(15, 23, 42, 0.95);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.navbar-logo {
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.navbar-logo:hover {
  transform: scale(1.05);
}

.navbar-logo img {
  height: 40px;
  width: 40px;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.navbar-links a {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--color-primary);
}

.navbar-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast);
}

.mobile-menu-btn:hover {
  color: var(--color-primary);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: 16px;
}

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

.mobile-menu a {
  display: block;
  padding: 12px 16px;
  color: var(--color-text-muted);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--color-primary);
  background: rgba(14, 165, 233, 0.1);
}

@media (max-width: 768px) {
  .navbar-links {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }
}

/* ============================================================
   GLASSMORPHISM CARD
   ============================================================ */
.glass {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
}

.glass-card {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

/* ============================================================
   GRADIENT TEXT
   ============================================================ */
.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-dim { color: var(--color-text-dim); }
.text-indigo { color: var(--color-indigo); }
.text-purple { color: var(--color-purple); }
.text-pink { color: var(--color-pink); }
.text-red { color: var(--color-red); }
.text-orange { color: var(--color-orange); }
.text-yellow { color: var(--color-yellow); }
.text-green { color: var(--color-green); }
.text-violet { color: var(--color-violet); }
.text-teal { color: var(--color-teal); }

.heading-xl {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.heading-lg {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
}

.heading-md {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
}

.heading-sm {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
}

@media (min-width: 768px) {
  .heading-xl {
    font-size: 3.5rem;
  }

  .heading-lg {
    font-size: 2.5rem;
  }
}

@media (min-width: 1024px) {
  .heading-xl {
    font-size: 4.25rem;
  }
}

/* ============================================================
   SECTION
   ============================================================ */
.section {
  padding: 96px 0;
}

.section-dark {
  background-color: var(--color-darker);
}

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

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

@media (min-width: 768px) {
  .section-header h2 {
    font-size: 2.5rem;
  }
}

.section-header p {
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto;
  font-size: 1.05rem;
}

.section-divider {
  width: 64px;
  height: 4px;
  background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
  margin: 16px auto 0;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg-blob {
  position: absolute;
  border-radius: 50%;
  mix-blend-mode: multiply;
  filter: blur(80px);
  opacity: 0.15;
  animation: pulse-slow 6s ease-in-out infinite;
}

.hero-bg-blob--primary {
  top: 80px;
  left: 40px;
  width: 320px;
  height: 320px;
  background: var(--color-primary);
}

.hero-bg-blob--secondary {
  top: 160px;
  right: 40px;
  width: 320px;
  height: 320px;
  background: var(--color-secondary);
  animation-delay: 2s;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  width: 100%;
  position: relative;
  z-index: 10;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }
}

.hero-tag {
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: 12px;
}

.hero-title {
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  min-height: 40px;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 1.5rem;
  }
}

.hero-typing {
  color: var(--color-primary);
  border-right: 2px solid var(--color-primary);
  padding-right: 4px;
  animation: blink-caret 0.8s step-end infinite;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 28px;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
  padding: 12px 0;
}

.hero-stat-number {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 2px;
}

/* Hero Buttons */
.hero-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

/* Hero Photo */
.hero-photo-wrapper {
  display: none;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 384px;
  height: 384px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .hero-photo-wrapper {
    display: flex;
  }
}

.hero-photo-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border-top: 4px solid var(--color-primary);
  border-bottom: 4px solid var(--color-primary);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-style: dashed;
  animation: spin-slow 10s linear infinite;
  opacity: 0.7;
}

.hero-photo-ring--inner {
  inset: 16px;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 4px solid var(--color-secondary);
  border-right: 4px solid var(--color-secondary);
  border-style: solid;
  animation: spin-slow 7s linear infinite reverse;
}

.hero-photo-glow {
  position: absolute;
  inset: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  filter: blur(40px);
  opacity: 0.2;
  animation: pulse-slow 4s ease-in-out infinite;
}

.hero-photo {
  position: relative;
  z-index: 10;
  width: 320px;
  height: 320px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--color-dark);
  box-shadow: var(--shadow-glow-primary);
  transition: transform var(--transition-slow);
}

.hero-photo:hover {
  transform: scale(1.05);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.45);
  transform: translateY(-2px);
}

.btn-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 4px 15px rgba(14, 165, 233, 0.25);
}

.btn-gradient:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4);
}

.btn-outline {
  background: rgba(30, 41, 59, 0.5);
  color: var(--color-text);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-outline:hover {
  background: rgba(30, 41, 59, 0.8);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-icon {
  padding: 12px;
  border-radius: var(--radius-lg);
  background: rgba(30, 41, 59, 0.5);
  color: var(--color-text-muted);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 1.15rem;
}

.btn-icon:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(14, 165, 233, 0.1);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.8rem;
}

/* Button Ripple Effect */
.btn .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: scale(0);
  animation: ripple-effect 0.6s linear;
  pointer-events: none;
}

/* ============================================================
   FEATURED ACHIEVEMENT
   ============================================================ */
.featured-achievement {
  position: relative;
}

.featured-card {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.08), rgba(16, 185, 129, 0.08));
  border: 1px solid rgba(14, 165, 233, 0.2);
  border-radius: var(--radius-2xl);
  padding: 40px;
  position: relative;
  overflow: hidden;
}

.featured-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.featured-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(14, 165, 233, 0.15);
  border: 1px solid rgba(14, 165, 233, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.featured-card-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}

@media (min-width: 768px) {
  .featured-card-title {
    font-size: 2rem;
  }
}

.featured-card-description {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 800px;
}

.featured-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

@media (min-width: 768px) {
  .featured-features {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .featured-features {
    grid-template-columns: repeat(6, 1fr);
  }
}

.featured-feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.featured-feature:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.featured-feature i {
  font-size: 1.5rem;
  color: var(--color-primary);
}

.featured-feature span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* ============================================================
   PROJECT CARDS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.project-card-image {
  position: relative;
  overflow: hidden;
  height: 200px;
  background: var(--color-surface);
}

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

.project-card:hover .project-card-image img {
  transform: scale(1.08);
}

.project-card-image-lg {
  height: 256px;
}

.project-card-body {
  padding: 24px;
}

.project-card-body-lg {
  padding: 32px;
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
  gap: 12px;
}

.project-card-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.project-card-title-lg {
  font-size: 1.5rem;
}

/* Tech Badges */
.tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.tech-badge {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(14, 165, 233, 0.1);
  color: var(--color-primary);
  border: 1px solid rgba(14, 165, 233, 0.2);
  letter-spacing: 0.02em;
}

.tech-badge--secondary {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-secondary);
  border-color: rgba(16, 185, 129, 0.2);
}

.tech-badge--purple {
  background: rgba(168, 85, 247, 0.1);
  color: var(--color-purple);
  border-color: rgba(168, 85, 247, 0.2);
}

.tech-badge--indigo {
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-indigo);
  border-color: rgba(99, 102, 241, 0.2);
}

.tech-badge--pink {
  background: rgba(236, 72, 153, 0.1);
  color: var(--color-pink);
  border-color: rgba(236, 72, 153, 0.2);
}

.tech-badge--yellow {
  background: rgba(234, 179, 8, 0.1);
  color: var(--color-yellow);
  border-color: rgba(234, 179, 8, 0.2);
}

.tech-badge--red {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-red);
  border-color: rgba(239, 68, 68, 0.2);
}

.tech-badge--violet {
  background: rgba(139, 92, 246, 0.1);
  color: var(--color-violet);
  border-color: rgba(139, 92, 246, 0.2);
}

.tech-badge--green {
  background: rgba(34, 197, 94, 0.1);
  color: var(--color-green);
  border-color: rgba(34, 197, 94, 0.2);
}

.tech-badge--orange {
  background: rgba(249, 115, 22, 0.1);
  color: var(--color-orange);
  border-color: rgba(249, 115, 22, 0.2);
}

.tech-badge--teal {
  background: rgba(20, 184, 166, 0.1);
  color: var(--color-teal);
  border-color: rgba(20, 184, 166, 0.2);
}

.project-card-description {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.project-card-metric {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--color-secondary);
  font-weight: 500;
  margin-bottom: 16px;
}

.project-card-metric i {
  font-size: 0.7rem;
}

.project-card-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.project-link:hover {
  color: #fff;
}

.project-link--primary {
  color: var(--color-primary);
}

.project-link--indigo {
  color: var(--color-indigo);
}

.project-link--purple {
  color: var(--color-purple);
}

.project-link--secondary {
  color: var(--color-secondary);
}

.project-link--red {
  color: var(--color-red);
}

.project-link--green {
  color: var(--color-green);
}

.project-link--yellow {
  color: var(--color-yellow);
}

.project-link--pink {
  color: var(--color-pink);
}

.project-link--violet {
  color: var(--color-violet);
}

/* Featured Project (full-width) */
.project-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr;
  overflow: hidden;
}

@media (min-width: 768px) {
  .project-featured {
    grid-template-columns: 1fr 1fr;
  }
}

.project-featured .project-card-image {
  height: 100%;
  min-height: 280px;
}

/* ============================================================
   SKILLS SECTION
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .skills-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.skill-category {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 24px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(14, 165, 233, 0.3);
}

.skill-category-icon {
  font-size: 1.75rem;
  margin-bottom: 12px;
  display: inline-block;
}

.skill-category-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--color-text);
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-pill {
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.skill-pill:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(14, 165, 233, 0.08);
}

/* ============================================================
   TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  padding-left: 32px;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary), transparent);
}

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

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

.timeline-dot {
  position: absolute;
  left: -32px;
  top: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-dark);
  border: 3px solid var(--color-primary);
  z-index: 2;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.timeline-item:hover .timeline-dot {
  border-color: var(--color-secondary);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.5);
}

.timeline-dot::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--color-primary);
  transition: background var(--transition-base);
}

.timeline-item:hover .timeline-dot::after {
  background: var(--color-secondary);
}

.timeline-content {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 24px;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.timeline-item:hover .timeline-content {
  border-color: rgba(14, 165, 233, 0.3);
  transform: translateX(4px);
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.timeline-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-description {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ============================================================
   EXPERIENCE / CERTIFICATIONS
   ============================================================ */
.experience-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .experience-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .experience-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.experience-card {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 28px;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.experience-card:hover {
  transform: translateY(-4px);
  border-color: rgba(14, 165, 233, 0.3);
}

.experience-card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.experience-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.experience-card-description {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.cert-card {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.cert-card:hover {
  transform: translateY(-4px);
  border-color: rgba(16, 185, 129, 0.3);
}

.cert-icon {
  font-size: 2rem;
  color: var(--color-secondary);
  flex-shrink: 0;
}

.cert-info-title {
  font-weight: 700;
  margin-bottom: 4px;
}

.cert-info-issuer {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.cert-info-year {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-top: 4px;
}

/* ============================================================
   GITHUB SECTION
   ============================================================ */
.github-stats {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}

.github-stats img {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-lg);
}

.github-stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  width: 100%;
}

.github-contrib {
  width: 100%;
  max-width: 900px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 0 auto 24px;
}

.github-contrib img {
  width: 100%;
  max-width: 100%;
}

/* ============================================================
   CONTACT SECTION
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

@media (min-width: 1024px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-info-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base);
}

.contact-info-item:hover {
  border-color: var(--color-primary);
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: rgba(14, 165, 233, 0.1);
  color: var(--color-primary);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-info-label {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-bottom: 2px;
}

.contact-info-value {
  font-weight: 600;
  font-size: 0.95rem;
}

.contact-form-wrapper {
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: 32px;
  border-top: 4px solid var(--color-primary);
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.6);
  color: var(--color-text);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   ABOUT — CODE EDITOR
   ============================================================ */
.code-editor {
  background: var(--color-darker);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: 24px 28px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 2;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
  overflow-x: auto;
}

@media (min-width: 768px) {
  .code-editor {
    font-size: 0.95rem;
    padding: 28px 32px;
  }
}

.code-editor:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 50px rgba(0, 0, 0, 0.5), var(--shadow-glow-primary);
}

.code-editor-dots {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-editor-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-editor-dot--red { background: var(--color-red); }
.code-editor-dot--yellow { background: var(--color-yellow); }
.code-editor-dot--green { background: var(--color-green); }

.code-keyword { color: var(--color-purple); font-weight: 600; }
.code-var { color: var(--color-primary); font-weight: 600; }
.code-key { color: var(--color-pink); }
.code-string { color: var(--color-secondary); }
.code-indent { padding-left: 24px; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-muted);
  font-size: 1.2rem;
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.footer-social a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(14, 165, 233, 0.1);
  transform: translateY(-2px);
}

.footer-copyright {
  color: var(--color-text-dim);
  font-size: 0.85rem;
}

/* ============================================================
   ABOUT PAGE GRID
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 64px;
  align-items: center;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   VIEW ALL PROJECTS
   ============================================================ */
.text-center {
  text-align: center;
}

.mt-12 {
  margin-top: 48px;
}

/* ============================================================
   PLACEHOLDER / GRADIENT CARD
   ============================================================ */
.placeholder-image {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.2), rgba(16, 185, 129, 0.2));
  color: var(--color-primary);
  font-size: 3rem;
}

/* ============================================================
   ANIMATIONS / KEYFRAMES
   ============================================================ */
@keyframes pulse-slow {
  0%, 100% { opacity: 0.15; transform: scale(1); }
  50% { opacity: 0.25; transform: scale(1.05); }
}

@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes blink-caret {
  0%, 100% { border-color: var(--color-primary); }
  50% { border-color: transparent; }
}

@keyframes ripple-effect {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   RESPONSIVE / UTILITY
   ============================================================ */
.hidden {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Page header for sub-pages */
.page-header {
  padding-top: 128px;
  padding-bottom: 48px;
  position: relative;
  overflow: hidden;
}

.page-header-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.1;
}

.page-header-bg-blob {
  position: absolute;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: var(--color-primary);
  border-radius: 50%;
  filter: blur(120px);
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
  body {
    background: #fff;
    color: #000;
  }

  .navbar,
  .hero-bg-blob,
  .hero-photo-ring,
  .hero-photo-glow,
  .skip-link {
    display: none;
  }

  .glass,
  .glass-card {
    background: #f5f5f5;
    border: 1px solid #ddd;
  }

  .gradient-text {
    -webkit-text-fill-color: #000;
    background: none;
  }
}