/* ==========================================================================
   Nitish D T - Personal Portfolio Stylesheet
   Modern, Mobile-First, Accessible (WCAG AA), Zero-Dependency
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables & Design System (Dual Theme)
   -------------------------------------------------------------------------- */
:root {
  /* Light Theme (Default fallback) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-glass: rgba(255, 255, 255, 0.85);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --accent-primary: #0284c7;
  --accent-hover: #0369a1;
  --accent-light: #e0f2fe;
  --accent-glow: rgba(2, 132, 199, 0.18);

  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-accent: #38bdf8;

  --badge-bg: #e0f2fe;
  --badge-text: #0369a1;
  --badge-border: #bae6fd;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.03);

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-theme: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;

  --nav-height: 72px;
}

[data-theme="dark"] {
  /* Dark Theme */
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #162032;
  --bg-card: #111a2e;
  --bg-card-hover: #16223b;
  --bg-glass: rgba(9, 13, 22, 0.88);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #090d16;

  --accent-primary: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-light: rgba(56, 189, 248, 0.12);
  --accent-glow: rgba(56, 189, 248, 0.25);

  --border-subtle: #1e293b;
  --border-strong: #334155;
  --border-accent: rgba(56, 189, 248, 0.4);

  --badge-bg: rgba(56, 189, 248, 0.12);
  --badge-text: #7dd3fc;
  --badge-border: rgba(56, 189, 248, 0.3);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.55);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.65);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: var(--transition-theme);
}

img, svg, video, iframe, embed, object {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

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

button {
  cursor: pointer;
  background: none;
  border: none;
}

ul, ol {
  list-style: none;
}

/* Focus visibility for accessibility (WCAG AA) */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--accent-primary);
  color: var(--text-inverse);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
  transition: top var(--transition-fast);
}

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

/* --------------------------------------------------------------------------
   Layout Containers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1140px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 52px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.125rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Header & Sticky Navigation
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-theme);
  height: var(--nav-height);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  border-radius: var(--radius-full);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--accent-primary);
  transition: width var(--transition-normal);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

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

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--accent-primary);
  border-color: var(--border-accent);
  background: var(--accent-light);
}

.theme-icon-sun, .theme-icon-moon {
  width: 20px;
  height: 20px;
  display: none;
}

[data-theme="light"] .theme-icon-moon {
  display: block;
}

[data-theme="dark"] .theme-icon-sun {
  display: block;
}

.hamburger-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.hamburger-btn:hover {
  background: var(--accent-light);
  color: var(--accent-primary);
}

/* Mobile Nav Drawer */
.mobile-nav {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transform: translateY(-120%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  z-index: 999;
  box-shadow: var(--shadow-xl);
}

.mobile-nav.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-link {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  display: block;
}

.mobile-nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 90px 0 80px 0;
  position: relative;
  overflow: hidden;
}

.hero-backdrop-glow {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-glow) 0%, rgba(0,0,0,0) 70%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--badge-text);
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-name {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.15;
}

.hero-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 18px;
  line-height: 1.4;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
  border: 1px solid var(--accent-primary);
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

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

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background-color: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--border-accent);
}

.hero-social-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.social-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.social-icon-btn:hover {
  color: var(--accent-primary);
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: var(--accent-light);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

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

.stat-number {
  font-family: var(--font-mono);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.interests-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.interest-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   Skills Matrix
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.skill-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.skill-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.skill-pill {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 6px 12px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.skill-pill:hover {
  background: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--border-accent);
}

/* --------------------------------------------------------------------------
   Projects Section
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
}

.project-card.featured {
  border-color: var(--border-accent);
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);
}

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.project-badge-ongoing {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.project-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 14px;
}

.project-points {
  margin-bottom: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.project-points li {
  position: relative;
  padding-left: 20px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.project-points li::before {
  content: '▸';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-primary);
  font-weight: 700;
}

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

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  color: var(--accent-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Certifications & Achievements
   -------------------------------------------------------------------------- */
.certifications-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

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

.cert-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.cert-content {
  flex-grow: 1;
}

.cert-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.cert-issuer {
  font-size: 0.9375rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.cert-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.cert-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 10px;
}

/* --------------------------------------------------------------------------
   Education Timeline
   -------------------------------------------------------------------------- */
.education-timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

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

.edu-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.edu-degree {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text-primary);
}

.edu-date {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-primary);
  background: var(--badge-bg);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.edu-institution {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.edu-score-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-top: 6px;
}

/* --------------------------------------------------------------------------
   GitHub Integration Strip & Cards
   -------------------------------------------------------------------------- */
.github-strip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.github-strip-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.github-strip-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.github-strip-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.github-strip-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.github-repos-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.repo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.repo-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

.repo-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.repo-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
  flex-grow: 1;
}

.repo-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.repo-lang {
  display: flex;
  align-items: center;
  gap: 6px;
}

.repo-lang-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
}

.github-fallback-box {
  background: var(--bg-card);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Resume Section & PDF Viewer
   -------------------------------------------------------------------------- */
.resume-action-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
}

.pdf-preview-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.pdf-preview-header {
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.pdf-frame {
  width: 100%;
  height: 720px;
  border: none;
  background-color: #525659;
}

.pdf-fallback-container {
  padding: 48px 24px;
  text-align: center;
  background: var(--bg-card);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.contact-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition-fast);
  color: var(--text-primary);
  text-decoration: none;
}

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

.contact-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.contact-card-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.email-copy-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--border-accent);
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.contact-form-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.contact-form-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  background: var(--bg-card);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.form-error {
  font-size: 0.75rem;
  color: #ef4444;
  margin-top: 4px;
  display: none;
}

/* --------------------------------------------------------------------------
   Toast Notification
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #10b981;
  color: #ffffff;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 9999;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 28px 0;
  margin-top: auto;
}

.footer-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
  text-align: center;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.back-to-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.back-to-top-btn:hover {
  color: var(--accent-primary);
  border-color: var(--border-accent);
}

/* --------------------------------------------------------------------------
   Scroll Reveal Animations
   -------------------------------------------------------------------------- */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Media Queries & Responsive Layouts
   -------------------------------------------------------------------------- */
@media (min-width: 640px) {
  .contact-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .certifications-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .hero-name {
    font-size: 3.5rem;
  }
  .hero-title {
    font-size: 1.45rem;
  }
  .nav-links {
    display: flex;
  }
  .hamburger-btn {
    display: none;
  }
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .github-repos-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-layout {
    grid-template-columns: 1.1fr 1fr;
  }
  .footer-top {
    flex-direction: row;
    text-align: left;
  }
  .footer-bottom {
    flex-direction: row;
  }
}

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

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
  .pulse-dot {
    animation: none !important;
  }
}