/* ==========================================================================
   Akshay Suresh - Personal Portfolio Stylesheet
   Modern, Clean, Minimalist Dark Theme for Cybersecurity / Penetration Testing
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design System Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Dark, Slate & Minimalist */
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-surface: #131c2e;
  --bg-surface-hover: #172338;
  --bg-card-subtle: #0d1424;

  /* Text & Contrast Hierarchy */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #090d16;

  /* Accent & Status Colors (Subtle, Non-Neon) */
  --accent: #38bdf8;             /* Refined Sky Cyan */
  --accent-hover: #0ea5e9;
  --accent-subtle: rgba(56, 189, 248, 0.12);
  --accent-border: rgba(56, 189, 248, 0.28);

  --status-emerald: #10b981;     /* Verified / Completed */
  --status-emerald-subtle: rgba(16, 185, 129, 0.12);
  --status-emerald-border: rgba(16, 185, 129, 0.25);

  --status-amber: #f59e0b;       /* In Progress */
  --status-amber-subtle: rgba(245, 158, 11, 0.12);
  --status-amber-border: rgba(245, 158, 11, 0.25);

  /* Borders & Dividers */
  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-medium: rgba(148, 163, 184, 0.22);
  --border-focus: #38bdf8;

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

  /* Sizing & Layout */
  --max-width: 1140px;
  --nav-height: 72px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 220ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.5);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--accent);
  color: var(--text-inverse);
  padding: 10px 18px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top var(--transition-fast);
  text-decoration: none;
}

.skip-link:focus {
  top: 20px;
  outline: 2px solid #fff;
}

/* Focus States */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

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

ul {
  list-style: none;
}

img, svg {
  display: block;
}

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

/* --------------------------------------------------------------------------
   Layout Containers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.section:last-of-type {
  border-bottom: none;
}

.section-header {
  margin-bottom: 3rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.25;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: 0.6rem;
  max-width: 680px;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background-color: rgba(9, 13, 22, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: border-color var(--transition-normal);
}

.header.scrolled {
  border-bottom-color: var(--border-medium);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

.brand-logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-name {
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.logo-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 500;
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.35rem 0;
}

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

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  background-color: var(--bg-surface-hover);
}

/* Mobile Toggle Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  gap: 5px;
  padding: 8px;
}

.hamburger-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: 6rem;
  padding-bottom: 6.5rem;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: 860px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.95rem;
  background-color: var(--status-emerald-subtle);
  border: 1px solid var(--status-emerald-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--status-emerald);
  margin-bottom: 1.75rem;
}

.status-indicator {
  width: 8px;
  height: 8px;
  background-color: var(--status-emerald);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-title {
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 0.4rem;
}

.hero-name {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
}

.hero-subtitle {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--text-secondary);
  font-weight: 500;
  letter-spacing: 0.01em;
  margin-bottom: 1.25rem;
}

.hero-description {
  font-size: 1.18rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: 1.75rem;
}

.hero-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 2.25rem;
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

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

.meta-separator {
  color: var(--border-medium);
}

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

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.2;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--text-inverse);
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
  transform: translateY(-1px);
}

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

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

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

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

.btn-sm {
  padding: 0.5rem 0.9rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.9rem 1.8rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  align-items: start;
}

.about-main-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.summary-lead {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--text-primary);
  margin-bottom: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

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

.pillar-card {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: all var(--transition-fast);
}

.pillar-card:hover {
  border-color: var(--border-medium);
  background-color: var(--bg-surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.pillar-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-subtle);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.9rem;
}

.pillar-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.pillar-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Aside Info Card */
.about-aside {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.info-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.info-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

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

.info-value {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-primary);
}

.info-link {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: color var(--transition-fast);
}

.info-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Skills Section
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.skill-category-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.skill-category-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.category-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-subtle);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.category-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  background-color: var(--bg-card-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  background-color: var(--bg-surface-hover);
}

/* --------------------------------------------------------------------------
   Experience Section (Vertical Timeline)
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 7px;
  width: 2px;
  background-color: var(--border-subtle);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

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

.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 1.25rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

.timeline-content {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.timeline-content:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.role-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.company-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.company-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.role-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-card-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.timeline-period {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
}

.role-duties {
  list-style: disc;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.role-duties li::marker {
  color: var(--accent);
}

.role-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mini-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.25rem 0.6rem;
  background-color: var(--bg-card-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   Projects Section
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}

.project-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.project-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Featured highlight cards */
.project-card.featured-highlight {
  border-color: var(--accent-border);
}

.project-card.featured-highlight:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.project-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--accent);
  background-color: var(--accent-subtle);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-border);
}

.featured-indicator {
  color: #fbbf24;
}

.project-external-link {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.project-external-link:hover {
  color: var(--accent);
}

.project-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

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

.project-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  background-color: var(--bg-card-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.project-footer {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

/* Additional Projects Card */
.additional-projects-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.additional-header {
  margin-bottom: 1.25rem;
}

.additional-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.additional-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.lab-tags-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.lab-tag-item {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  position: relative;
  transition: all var(--transition-fast);
}

.lab-tag-item:hover {
  border-color: var(--border-medium);
  background-color: var(--bg-surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.lab-tag-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.lab-tag-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.lab-tag-dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 50%;
  position: absolute;
  top: 1rem;
  right: 1rem;
}

/* --------------------------------------------------------------------------
   Certifications Section
   -------------------------------------------------------------------------- */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.cert-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.cert-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cert-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.cert-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cert-completed .cert-icon {
  background-color: var(--status-emerald-subtle);
  color: var(--status-emerald);
}

.cert-progress .cert-icon {
  background-color: var(--status-amber-subtle);
  color: var(--status-amber);
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
}

.badge-success {
  background-color: var(--status-emerald-subtle);
  color: var(--status-emerald);
  border: 1px solid var(--status-emerald-border);
}

.badge-progress {
  background-color: var(--status-amber-subtle);
  color: var(--status-amber);
  border: 1px solid var(--status-amber-border);
}

.cert-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 0.4rem;
  flex-grow: 1;
}

.cert-issuer {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1.25rem;
}

.cert-date {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   Education Section
   -------------------------------------------------------------------------- */
.education-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.edu-main {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.edu-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--accent-subtle);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.edu-degree {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.edu-institution {
  font-size: 1rem;
  color: var(--text-secondary);
}

.edu-period {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3rem;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.contact-header {
  margin-bottom: 2.5rem;
  text-align: center;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.contact-title {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 0.85rem;
}

.contact-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.contact-channel {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.channel-clickable {
  cursor: pointer;
}

.contact-channel:hover,
.channel-clickable:hover {
  border-color: var(--border-medium);
  background-color: var(--bg-surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.channel-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-subtle);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.channel-content {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
  flex-grow: 1;
}

.channel-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.channel-link {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-channel:hover .channel-link {
  color: var(--accent);
}

.channel-arrow {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.channel-clickable:hover .channel-arrow {
  color: var(--accent);
  transform: translate(2px, -2px);
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  flex-shrink: 0;
  cursor: pointer;
}

.btn-copy:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  background-color: var(--bg-surface-hover);
}

.contact-action {
  display: flex;
  justify-content: center;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  margin-top: auto;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-subtle);
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
}

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

.footer-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-role {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

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

.footer-sep {
  color: var(--border-medium);
}

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

/* --------------------------------------------------------------------------
   Toast Notification (Copy feedback)
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--bg-surface);
  border: 1px solid var(--status-emerald-border);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  z-index: 9999;
  transform: translateY(100px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

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

.toast svg {
  color: var(--status-emerald);
}

/* --------------------------------------------------------------------------
   Scroll Reveal States (Intersection Observer)
   -------------------------------------------------------------------------- */
.reveal-item {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  will-change: opacity, transform;
}

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

/* --------------------------------------------------------------------------
   Responsive Media Queries
   -------------------------------------------------------------------------- */

/* Tablet (Max 992px) */
@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

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

  .contact-card {
    padding: 2.25rem;
  }
}

/* Mobile Devices (Max 768px) */
@media (max-width: 768px) {
  .section {
    padding-top: 3.75rem;
    padding-bottom: 3.75rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background-color: rgba(9, 13, 22, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-medium);
    padding: 1.5rem;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.6);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
    width: 100%;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    display: block;
    font-size: 1.05rem;
    padding: 0.5rem 0;
    width: 100%;
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-link.active::after {
    display: none;
  }

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

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-marker {
    left: -1.5rem;
  }

  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .education-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-container {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .contact-card {
    padding: 2.5rem 1.75rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .contact-title {
    font-size: 1.75rem;
  }
}

/* Small Mobile (Max 480px) */
@media (max-width: 480px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

  .contact-card {
    padding: 2rem 1.15rem;
    border-radius: var(--radius-md);
  }

  .contact-title {
    font-size: 1.4rem;
  }

  .contact-channel {
    padding: 1rem 1.1rem;
    gap: 0.85rem;
  }

  .channel-icon {
    width: 38px;
    height: 38px;
  }

  .channel-link {
    font-size: 0.82rem;
  }

  .channel-arrow {
    width: 28px;
    height: 28px;
  }

  .btn-copy {
    padding: 0.35rem 0.6rem;
    font-size: 0.72rem;
  }
}

/* Reduced Motion for Accessibility */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal-item {
    opacity: 1 !important;
    transform: none !important;
  }
}