/* ==========================================
   Ramnath Bhat - Portfolio CSS Stylesheet
   Hosting Support Engineer | ramnathbhat.com
   ========================================== */

/* --- Root Color System (Dark Theme Default) --- */
:root {
  --bg-primary: #090d16;
  --bg-secondary: #101625;
  --bg-card: #161e31;
  --bg-card-hover: #1e2842;
  --bg-input: #111827;
  --bg-nav: rgba(9, 13, 22, 0.85);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #090d16;

  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;

  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --accent-glow: rgba(59, 130, 246, 0.2);

  --railgram-accent: #10b981;
  --railgram-gradient: linear-gradient(135deg, #059669 0%, #d97706 100%);

  --yora-accent: #8b5cf6;
  --yora-gradient: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);

  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(59, 130, 246, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.15);

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-code: 'Fira Code', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-height: 72px;
}

/* --- Light Theme Override --- */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #ffffff;
  --bg-nav: rgba(248, 250, 252, 0.88);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --border-color: rgba(15, 23, 42, 0.08);
  --border-hover: rgba(37, 99, 235, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.1);
}

/* --- Custom Text Selection Highlight --- */
::selection {
  background: rgba(59, 130, 246, 0.35);
  color: var(--accent-cyan);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

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

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

.section {
  padding: 96px 0;
  position: relative;
}

/* --- Typography Helpers --- */
.section-subtitle {
  color: var(--accent-blue);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 680px;
  margin-bottom: 48px;
}

/* --- Header / Navigation --- */
/* ==========================================
   3. HEADER & NAVIGATION
   ========================================== */
.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  color: var(--text-primary);
  font-size: 1.05rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.logo-badge {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: #ffffff;
  padding: 5px 9px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  box-shadow: 0 2px 10px rgba(59, 130, 246, 0.3);
}

.logo-text {
  font-weight: 800;
  letter-spacing: -0.3px;
}

/* Desktop Nav Links */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
  white-space: nowrap;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 2px;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.ext-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.ext-btn-railgram {
  background: rgba(225, 29, 72, 0.12);
  color: #fb7185;
  border: 1px solid rgba(225, 29, 72, 0.3);
}

.ext-btn-railgram:hover {
  background: #e11d48;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(225, 29, 72, 0.4);
}

.ext-btn-yora {
  background: rgba(217, 119, 6, 0.12);
  color: #fbbf24;
  border: 1px solid rgba(217, 119, 6, 0.3);
}

.ext-btn-yora:hover {
  background: #d97706;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.4);
}

.social-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  transition: all var(--transition-fast);
}

.social-icon-btn:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--accent-amber);
}

.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
}

/* Mobile Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background: var(--bg-primary);
  z-index: 999;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateX(100%);
  transition: transform 0.3s ease-in-out;
  overflow-y: auto;
  border-top: 1px solid var(--border-color);
}

.mobile-nav-drawer.open {
  transform: translateX(0);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-link {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
}

.mobile-nav-link.active {
  color: var(--accent-blue);
  font-weight: 700;
}

.mobile-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

/* --- Hero Section --- */
.hero-section {
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 60px;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 25% 25%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(6, 182, 212, 0.06) 0%, transparent 50%),
    linear-gradient(to right, var(--border-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border-color) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 40%, transparent 100%);
  z-index: 0;
  pointer-events: none;
}

/* Canvas Matrix Rain Animation */
.hero-matrix-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.38;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-full);
  color: var(--accent-blue);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-blue);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-blue);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.2); }
}

.hero-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

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

.hero-tags-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}

.hero-tag {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.hero-description {
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 720px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 0.975rem;
  font-weight: 700;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

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

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

.btn-outline {
  background: transparent;
  color: var(--accent-blue);
  border: 1px dashed var(--border-hover);
}

.btn-outline:hover {
  background: rgba(59, 130, 246, 0.1);
  border-style: solid;
  transform: translateY(-2px);
}

/* --- Highlights Cards --- */
.highlights-section {
  padding: 40px 0 80px;
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.highlight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.highlight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.highlight-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

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

.highlight-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.highlight-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.highlight-sub {
  font-size: 0.875rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-bottom: 8px;
}

.highlight-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* --- About Me --- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.about-text-content {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.about-text-content p {
  margin-bottom: 20px;
}

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

.skill-tag-sm {
  padding: 6px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.journey-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.timeline-stepper {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
}

.timeline-stepper::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 15px;
  width: 2px;
  background: var(--border-color);
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  position: relative;
  z-index: 1;
}

.step-node {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--accent-blue);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-item.active .step-node {
  background: var(--accent-blue);
  color: #ffffff;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.5);
}

.step-info {
  padding-top: 4px;
}

.step-name {
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--text-primary);
}

.step-sub {
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* --- Experience --- */
.experience-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: all var(--transition-normal);
  position: relative;
}

.experience-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.exp-title-group h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.exp-company {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 8px;
}

.exp-badge-date {
  padding: 6px 14px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-full);
  color: var(--accent-blue);
  font-size: 0.875rem;
  font-weight: 700;
}

.exp-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-style: italic;
}

.exp-bullets {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
  list-style: none;
}

.exp-bullets li {
  position: relative;
  padding-left: 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.exp-bullets li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-emerald);
  font-weight: 800;
}

/* --- Skills --- */
.skills-categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

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

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

.cat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cat-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.skill-chip:hover {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.08);
  color: var(--accent-blue);
  transform: translateY(-1px);
}

/* --- Education & Currently Learning --- */
.edu-learning-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
}

.edu-card, .learning-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.edu-title-group h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.edu-univ {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 16px;
}

.edu-text {
  color: var(--text-secondary);
  font-size: 0.975rem;
  line-height: 1.6;
}

.learning-pills {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.learning-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.learning-pill:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.15);
}

/* --- Projects Section --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

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

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

.project-card-railgram {
  border-top: 4px solid var(--railgram-accent);
}

.project-card-railgram:hover {
  border-color: var(--railgram-accent);
}

.project-card-yora {
  border-top: 4px solid var(--yora-accent);
}

.project-card-yora:hover {
  border-color: var(--yora-accent);
}

.project-header-banner {
  padding: 36px 32px 24px;
  position: relative;
}

.railgram-banner {
  background: linear-gradient(135deg, rgba(5, 150, 105, 0.15) 0%, rgba(217, 119, 6, 0.15) 100%);
}

.yora-banner {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, rgba(236, 72, 153, 0.15) 100%);
}

.project-cat-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.railgram-badge {
  background: rgba(16, 185, 129, 0.2);
  color: var(--railgram-accent);
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.yora-badge {
  background: rgba(139, 92, 246, 0.2);
  color: var(--yora-accent);
  border: 1px solid rgba(139, 92, 246, 0.4);
}

.project-name {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
}

.project-body {
  padding: 0 32px 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.project-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-project {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  text-decoration: none;
}

.btn-project:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.btn-railgram-primary {
  background: var(--railgram-accent);
  color: #ffffff;
  border: none;
}

.btn-railgram-primary:hover {
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
}

.btn-yora-primary {
  background: var(--yora-accent);
  color: #ffffff;
  border: none;
}

.btn-yora-primary:hover {
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.4);
}

/* --- Knowledge Base --- */
.kb-controls {
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.kb-search-box {
  position: relative;
  max-width: 600px;
  width: 100%;
}

.kb-search-input {
  width: 100%;
  padding: 16px 20px 16px 48px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  color: var(--text-primary);
  font-family: inherit;
  transition: all var(--transition-fast);
}

.kb-search-input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.kb-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.kb-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kb-tab-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.kb-tab-btn:hover, .kb-tab-btn.active {
  background: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

.kb-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.kb-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
}

.kb-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.kb-category-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.kb-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.kb-card-snippet {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.kb-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--accent-blue);
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

/* --- Resume Section --- */
.resume-card-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.resume-summary-content h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.resume-summary-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 24px;
}

.resume-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.resume-preview-box {
  background: var(--bg-secondary);
  border: 1px dashed var(--border-hover);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.resume-preview-box svg {
  margin: 0 auto 12px;
  color: var(--accent-blue);
}

.resume-preview-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.resume-preview-sub {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --- Social Media Section ("Follow My Work") --- */
.social-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.social-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-normal);
}

.social-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.social-card-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.social-card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.social-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 40px;
}

.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-method-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.contact-method-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-method-text label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 700;
}

.contact-method-text p, .contact-method-text a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
}

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

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --- Modals & Toast Alerts --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 720px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 36px;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close-btn:hover {
  background: var(--accent-blue);
  color: #ffffff;
}

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2500;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--accent-emerald);
  color: var(--text-primary);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* --- Code Snippet Styling in KB Modal --- */
.code-block-wrapper {
  position: relative;
  margin: 14px 0;
}

.code-block {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: var(--font-code);
  font-size: 0.875rem;
  color: var(--accent-cyan);
  margin: 0;
  overflow-x: auto;
}

.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.code-copy-btn:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  background: var(--bg-card-hover);
}

.code-copy-btn.copied {
  color: var(--accent-emerald);
  border-color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
}

/* --- Scroll Progress Bar & Floating Back-To-Top Button --- */
.scroll-progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent-gradient);
  z-index: 1001;
  transition: width 0.1s ease-out;
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.6);
}

.back-to-top-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  background: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

/* --- Responsive Media Queries --- */
@media (max-width: 1024px) {
  .nav-desktop, .header-actions .ext-btn, .header-actions .social-icon-btn {
    display: none;
  }
  .mobile-toggle {
    display: flex;
  }
  .highlights-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid, .edu-learning-grid, .contact-grid {
    grid-template-columns: 1fr;
  }
  .kb-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-desktop, .header-actions .ext-btn, .header-actions .social-icon-btn {
    display: none;
  }
  .mobile-toggle {
    display: flex;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .highlights-grid {
    grid-template-columns: 1fr;
  }
  .skills-categories-grid {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .social-grid {
    grid-template-columns: 1fr;
  }
  .kb-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .exp-bullets {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .learning-pills {
    grid-template-columns: 1fr;
  }
}