/* ==========================================================================
   abhicodes.online | Design System & Core Stylesheet
   Crafted for Abhishek Kumar (Abhi) - Data Scientist & Analytics Engineer
   ========================================================================== */

:root {
  /* Color Palette - Cyber Dark (Default) */
  --bg-primary: #07090e;
  --bg-secondary: #0d121d;
  --bg-card: rgba(16, 24, 39, 0.75);
  --bg-card-hover: rgba(23, 34, 56, 0.88);
  --bg-glass: rgba(13, 20, 36, 0.65);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.35);
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.35);
  --accent-violet: #8b5cf6;
  --accent-violet-glow: rgba(139, 92, 246, 0.35);
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(6, 182, 212, 0.4);
  --border-glow: rgba(16, 185, 129, 0.45);

  --font-sans: 'Outfit', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 25px var(--accent-cyan-glow);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme Mode */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass: rgba(255, 255, 255, 0.75);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #f8fafc;

  --accent-cyan: #0284c7;
  --accent-cyan-glow: rgba(2, 132, 199, 0.2);
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.2);
  --accent-violet: #7c3aed;
  --accent-violet-glow: rgba(124, 58, 237, 0.2);

  --border-subtle: rgba(15, 23, 42, 0.1);
  --border-accent: rgba(2, 132, 199, 0.35);
  --border-glow: rgba(5, 150, 105, 0.35);

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.2);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(6, 182, 212, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 35%, rgba(139, 92, 246, 0.07) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* Modern Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #2dd4bf 50%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.gradient-text-alt {
  background: linear-gradient(135deg, #34d399 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Glassmorphism Card Style */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-panel:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md), 0 0 15px var(--accent-cyan-glow);
}

/* Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal), border-color var(--transition-normal);
  padding: 1rem 0;
}

.navbar.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 0;
  box-shadow: var(--shadow-sm);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-badge {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-emerald));
  display: grid;
  place-items: center;
  color: #07090e;
  font-weight: 800;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), #0284c7);
  color: #07090e;
  font-weight: 700;
  box-shadow: 0 4px 14px var(--accent-cyan-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.5);
  background: linear-gradient(135deg, #22d3ee, #0284c7);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-accent);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-emerald {
  background: linear-gradient(135deg, var(--accent-emerald), #059669);
  color: #07090e;
  font-weight: 700;
  box-shadow: 0 4px 14px var(--accent-emerald-glow);
}

.btn-emerald:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

/* Status Pill */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); 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 Section */
.hero-section {
  padding-top: 8.5rem;
  padding-bottom: 5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-title {
  font-size: clamp(2.4rem, 4.2vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.hero-quick-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.quick-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.quick-meta-item svg {
  color: var(--accent-cyan);
}

/* Hero Media Visual Card */
.hero-visual-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  box-shadow: var(--shadow-lg), 0 0 30px var(--accent-cyan-glow);
  transform: perspective(1000px) rotateY(-3deg) rotateX(2deg);
  transition: transform var(--transition-slow);
}

.hero-visual-card:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.hero-image-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, var(--bg-primary) 0%, rgba(7, 9, 14, 0.8) 50%, transparent 100%);
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(6, 182, 212, 0.2);
  color: var(--accent-cyan);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid rgba(6, 182, 212, 0.4);
}

/* Metrics Counter Banner */
.metrics-section {
  padding-block: 2.5rem;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(13, 18, 29, 0.4);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.metric-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  text-align: center;
  transition: all var(--transition-fast);
}

.metric-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-3px);
}

.metric-number {
  font-size: 2.3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
  line-height: 1;
}

.metric-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(2rem, 3vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* Interactive Data Science Sandbox */
.sandbox-section {
  padding-block: 6rem;
  background: radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 60%);
}

.sandbox-container {
  border: 1px solid var(--border-accent);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 30px rgba(6, 182, 212, 0.15);
}

.sandbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.75rem;
  background: rgba(13, 18, 29, 0.9);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 1rem;
}

.sandbox-tabs {
  display: flex;
  gap: 0.5rem;
  background: rgba(7, 9, 14, 0.6);
  padding: 0.35rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.sandbox-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.sandbox-tab-btn.active {
  background: var(--accent-cyan);
  color: #07090e;
  font-weight: 700;
  box-shadow: 0 0 10px var(--accent-cyan-glow);
}

.sandbox-body {
  padding: 2rem;
}

.sandbox-tab-pane {
  display: none;
}

.sandbox-tab-pane.active {
  display: block;
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Sandbox 1: Confusion Matrix & ROC */
.cm-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2.5rem;
  align-items: center;
}

.control-slider-group {
  margin-bottom: 1.5rem;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.custom-range-slider {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-block: 1.5rem;
}

.matrix-cell {
  background: rgba(13, 18, 29, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
  text-align: center;
  transition: border-color var(--transition-fast);
}

.matrix-cell.tp { border-color: rgba(16, 185, 129, 0.4); }
.matrix-cell.tn { border-color: rgba(6, 182, 212, 0.4); }
.matrix-cell.fp { border-color: rgba(245, 158, 11, 0.4); }
.matrix-cell.fn { border-color: rgba(244, 63, 94, 0.4); }

.cell-count {
  font-size: 1.6rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-top: 0.25rem;
}

.calc-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.calc-metric-pill {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  text-align: center;
}

.calc-metric-val {
  font-size: 1.25rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

/* Sandbox 2: Retail Trends */
.chart-container {
  width: 100%;
  height: 280px;
  position: relative;
}

/* Sandbox 3: SQL Console */
.sql-console {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.5rem;
}

.sql-editor {
  background: #05070c;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #38bdf8;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
}

.sql-result-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: rgba(7, 9, 14, 0.5);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.data-table th, .data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.data-table th {
  background: rgba(13, 18, 29, 0.9);
  color: var(--text-secondary);
  font-weight: 600;
  font-family: var(--font-mono);
}

.data-table td {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

/* Projects Section */
.projects-section {
  padding-block: 6rem;
}

.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.filter-btn:hover {
  border-color: var(--border-accent);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: linear-gradient(135deg, var(--accent-cyan), #0284c7);
  color: #07090e;
  border-color: transparent;
  box-shadow: 0 0 15px var(--accent-cyan-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 2rem;
}

/* Project Card */
.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}

.project-card.featured {
  border-color: var(--border-accent);
  box-shadow: 0 8px 30px rgba(6, 182, 212, 0.12);
}

.project-card-image-box {
  width: 100%;
  aspect-ratio: 16 / 9;
  position: relative;
  overflow: hidden;
  background: #0d121d;
}

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

.project-card:hover .project-card-img {
  transform: scale(1.05);
}

.project-category-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
}

.project-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 1rem;
}

.project-title {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.3;
}

.project-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tech-tag {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.project-links-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--border-accent);
  background: rgba(6, 182, 212, 0.1);
  transform: translateY(-2px);
}

/* Skills Section */
.skills-section {
  padding-block: 6rem;
  border-top: 1px solid var(--border-subtle);
  background: rgba(13, 18, 29, 0.3);
}

.skills-categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
}

.skill-category-card {
  padding: 1.75rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.skill-category-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.skill-cat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  display: grid;
  place-items: center;
  color: var(--accent-cyan);
}

.skill-cat-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.skill-items-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.skill-item-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 600;
}

.skill-progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
}

.skill-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald));
  border-radius: 3px;
  transition: width 1s ease-out;
}

/* Architecture & Workflow Diagram Section */
.workflow-section {
  padding-block: 6rem;
}

.workflow-card {
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
}

.workflow-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  position: relative;
}

.workflow-step {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  background: rgba(7, 9, 14, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  position: relative;
  transition: all var(--transition-fast);
}

.workflow-step:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  width: fit-content;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.step-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Modal Popup for Case Studies */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: none;
  place-items: center;
  padding: 1.5rem;
}

.modal-backdrop.active {
  display: grid;
  animation: modalFadeIn 0.25s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-dialog {
  background: var(--bg-card-hover);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  max-width: 820px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg), 0 0 40px var(--accent-cyan-glow);
  position: relative;
}

.modal-header {
  padding: 1.75rem 2rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  position: sticky;
  top: 0;
  background: rgba(13, 18, 29, 0.95);
  backdrop-filter: blur(10px);
  z-index: 10;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  padding: 0.25rem;
  transition: color var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--accent-rose);
}

.modal-body {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.modal-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  padding: 1.25rem;
  background: rgba(7, 9, 14, 0.5);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.modal-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.modal-meta-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}

.modal-meta-val {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* About / Credentials Section */
.about-section {
  padding-block: 6rem;
  background: rgba(13, 18, 29, 0.4);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3.5rem;
  align-items: center;
}

.about-avatar-card {
  text-align: center;
  padding: 2.5rem 2rem;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.avatar-img-wrapper {
  position: relative;
  width: 170px;
  height: 170px;
  border-radius: 50%;
  padding: 5px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-emerald), var(--accent-violet));
  box-shadow: 0 0 25px var(--accent-cyan-glow);
}

.avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-primary);
}

.social-links-row {
  display: flex;
  gap: 0.85rem;
}

/* Contact & Hire Me Section */
.contact-section {
  padding-block: 6rem;
  position: relative;
}

.contact-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  padding: 3.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-accent);
  background: var(--bg-card);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(6, 182, 212, 0.12);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.contact-details-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  display: grid;
  place-items: center;
  color: var(--accent-cyan);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.85rem 1.15rem;
  background: rgba(7, 9, 14, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  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-cyan);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
  background: rgba(7, 9, 14, 0.85);
}

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

/* Toast Notification */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-accent);
  color: var(--text-primary);
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 3000;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* Vercel & Domain Info Banner */
.vercel-domain-banner {
  margin-top: 3rem;
  padding: 1.5rem 2rem;
  border-radius: var(--radius-md);
  background: rgba(6, 182, 212, 0.05);
  border: 1px dashed rgba(6, 182, 212, 0.3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  padding-block: 3.5rem 2.5rem;
  border-top: 1px solid var(--border-subtle);
  background: #04060a;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

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

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-visual-card {
    max-width: 600px;
    margin-inline: auto;
    transform: none;
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cm-layout {
    grid-template-columns: 1fr;
  }

  .sql-console {
    grid-template-columns: 1fr;
  }

  .workflow-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-card {
    grid-template-columns: 1fr;
    padding: 2.5rem 1.75rem;
  }
}

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

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

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card-hover);
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-lg);
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .workflow-steps-grid {
    grid-template-columns: 1fr;
  }
}