/* ==========================================================================
   DENYS DMITRIIEV — SENIOR DEVSECOPS & CLOUD PORTFOLIO
   Design System, CSS Custom Properties & Responsive Stylesheet
   Includes: Dynamic Cosmo View Background & Protected Data Elements
   Static-First Architecture (Standard LAMP Hosting Compatible)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette — Deep Space Dark Mode (Default) */
  --bg-primary: #060913;
  --bg-secondary: #0b1120;
  --bg-card: rgba(11, 17, 32, 0.78);
  --bg-card-hover: rgba(22, 33, 62, 0.85);
  --bg-surface: #151f38;
  --bg-terminal: #040711;

  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-card: rgba(148, 163, 184, 0.18);
  --border-focus: #38bdf8;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #060913;

  --accent-cyan: #38bdf8;
  --accent-cyan-subtle: rgba(56, 189, 248, 0.12);
  --accent-emerald: #10b981;
  --accent-emerald-subtle: rgba(16, 185, 129, 0.12);
  --accent-amber: #f59e0b;
  --accent-blue: #3b82f6;
  --accent-purple-cosmo: rgba(99, 102, 241, 0.15);

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

  /* Sizing & Spacing */
  --max-width: 1200px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows & Glassmorphism */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 30px -4px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.18);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #e2e8f0;
  --bg-surface: #e2e8f0;
  --bg-terminal: #0f172a;

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-card: rgba(15, 23, 42, 0.12);
  --border-focus: #0284c7;

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

  --accent-cyan: #0284c7;
  --accent-cyan-subtle: rgba(2, 132, 199, 0.1);
  --accent-emerald: #059669;
  --accent-emerald-subtle: rgba(5, 150, 105, 0.1);
  --accent-amber: #d97706;
  --accent-blue: #2563eb;
  --accent-purple-cosmo: rgba(99, 102, 241, 0.06);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(2, 132, 199, 0.1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@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;
  }
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* --------------------------------------------------------------------------
   3. Dynamic Cosmo View Background Canvas & Nebula Layers
   -------------------------------------------------------------------------- */
.cosmo-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  display: block;
}

/* Cosmic Nebula Atmosphere Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background-image: 
    radial-gradient(circle at 20% 15%, var(--accent-purple-cosmo) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, var(--accent-cyan-subtle) 0%, transparent 45%),
    radial-gradient(circle at 50% 85%, var(--accent-emerald-subtle) 0%, transparent 40%);
  z-index: 0;
  opacity: 0.85;
}

[data-theme="light"] body::before {
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(56, 189, 248, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 25%, rgba(236, 72, 153, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(168, 85, 247, 0.12) 0%, transparent 50%);
  opacity: 0.95;
}

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

a:hover {
  text-decoration: underline;
}

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

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

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

/* Skip link for Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-cyan);
  color: var(--text-inverse);
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 10000;
  transition: top var(--transition-fast);
  text-decoration: none;
}
.skip-link:focus {
  top: 1rem;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  position: relative;
  z-index: 1;
}

/* Section Common */
section {
  padding: 5.5rem 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: var(--accent-cyan-subtle);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  backdrop-filter: blur(8px);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

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

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(6, 9, 19, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="light"] .site-header {
  background: rgba(241, 245, 249, 0.88);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}
.brand-logo:hover {
  text-decoration: none;
}

.brand-monogram {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.9375rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: var(--text-inverse);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.brand-meta {
  display: flex;
  flex-direction: column;
}
.brand-name {
  font-size: 0.9375rem;
  line-height: 1.2;
}
.brand-role {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  font-family: var(--font-mono);
}

/* Nav Links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.4rem 0.2rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  text-decoration: none;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: var(--radius-full);
}

/* Controls (Lang + Theme) */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switcher {
  display: flex;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--bg-card);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-sm);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-card);
}

.theme-icon-sun {
  display: none;
}
[data-theme="light"] .theme-icon-sun {
  display: block;
}
[data-theme="light"] .theme-icon-moon {
  display: none;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  padding: 0.5rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   5. Hero Section & Status Console
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 4.5rem 0 5rem;
  min-height: calc(85vh - var(--header-height));
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  background: var(--accent-emerald-subtle);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  width: fit-content;
  backdrop-filter: blur(8px);
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--text-primary);
}

.hero-title span {
  color: var(--accent-cyan);
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.5;
}

.hero-description {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 600px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--text-inverse);
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-card);
  backdrop-filter: blur(8px);
}

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

.hero-social {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
  text-decoration: none;
  background: none;
  border: none;
  font-size: inherit;
  font-family: inherit;
  cursor: pointer;
  padding: 0;
}
.social-link:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}

/* Terminal / Stack Snapshot Console */
.terminal-panel {
  background: var(--bg-terminal);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  backdrop-filter: blur(12px);
}

.terminal-header {
  background: #0d1322;
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.terminal-dots {
  display: flex;
  gap: 6px;
}
.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.terminal-title {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
}

.terminal-body {
  padding: 1.25rem;
  color: #e2e8f0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.terminal-cmd {
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.terminal-cmd::before {
  content: "$";
  color: var(--text-muted);
}

.terminal-output {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 0.75rem;
}

.terminal-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.term-label {
  color: var(--text-muted);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.term-val {
  color: #f8fafc;
  font-weight: 600;
  font-size: 0.8125rem;
}

.terminal-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}
.term-tag {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  font-size: 0.7rem;
}

/* --------------------------------------------------------------------------
   6. Key Stats Bar
   -------------------------------------------------------------------------- */
.stats-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 1rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0.5rem;
  position: relative;
}

.stat-card:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -0.75rem;
  top: 15%;
  height: 70%;
  width: 1px;
  background: var(--border-subtle);
}

.stat-value {
  font-size: 2.25rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.stat-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.stat-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   7. About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: start;
}

.about-text-block {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  font-size: 1.03125rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.about-text-block p strong {
  color: var(--text-primary);
}

.about-highlights-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
}

.highlights-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.highlights-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.highlights-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.highlights-list li svg {
  flex-shrink: 0;
  margin-top: 0.2rem;
  color: var(--accent-emerald);
}

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

.skill-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  backdrop-filter: blur(12px);
}

.skill-category-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
}

.skill-cat-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

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

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-subtle);
  color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   9. Experience Timeline
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background: var(--border-card);
}

.timeline-item {
  position: relative;
  padding-left: 3.5rem;
}

.timeline-marker {
  position: absolute;
  left: 12px;
  top: 1.25rem;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-cyan);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: border-color var(--transition-normal);
  backdrop-filter: blur(12px);
}

.timeline-card:hover {
  border-color: var(--border-focus);
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

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

.company-name {
  color: var(--accent-cyan);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

.company-name:hover {
  text-decoration: underline;
  opacity: 0.9;
}

.period-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-surface);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.location-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.timeline-summary {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.achievements-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.achievements-bullets li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.5;
}

.achievements-bullets li::before {
  content: "▹";
  color: var(--accent-cyan);
  font-weight: bold;
}

.tech-stack-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-subtle);
}

.tech-pill {
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   10. Projects Section & Lightweight Filter
   -------------------------------------------------------------------------- */
.filter-container {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-cyan);
  color: var(--text-inverse);
  border-color: var(--accent-cyan);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
}

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

.project-top {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-category-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.project-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.project-impact-box {
  background: var(--accent-emerald-subtle);
  border-left: 3px solid var(--accent-emerald);
  padding: 0.6rem 0.85rem;
  font-size: 0.8125rem;
  color: var(--accent-emerald);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.project-bottom {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* --------------------------------------------------------------------------
   11. Certifications, Education & Languages
   -------------------------------------------------------------------------- */
.credentials-wrapper {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.education-block, .certifications-block {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.column-header-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.edu-grid-2x2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

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

.cert-card, .edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color var(--transition-fast);
  backdrop-filter: blur(12px);
}

.cert-card-badge {
  flex-direction: row;
  align-items: flex-start;
  gap: 1.15rem;
}

.cert-badge-wrap {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
  padding: 0.25rem;
  border: 1px solid var(--border-subtle);
}

.cert-badge-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.cert-body {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex-grow: 1;
}

.cert-verify-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.35rem;
}

.cert-verify-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: var(--accent-cyan-subtle);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.cert-verify-btn:hover {
  background: var(--accent-cyan);
  color: var(--bg-primary);
  border-color: var(--accent-cyan);
  text-decoration: none;
}

.to-be-continued-wrap {
  display: flex;
  justify-content: center;
  margin-top: 2rem;
}

.to-be-continued-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px dashed var(--border-card);
  border-radius: var(--radius-full);
  letter-spacing: 0.03em;
  user-select: none;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.to-be-continued-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.cert-card:hover, .edu-card:hover {
  border-color: var(--accent-cyan);
}

.cert-name, .edu-degree {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.cert-issuer {
  font-size: 0.875rem;
  color: var(--accent-cyan);
}

.edu-school {
  font-size: 0.875rem;
  color: var(--accent-cyan);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

.edu-school:hover {
  text-decoration: underline;
  opacity: 0.9;
}

.cert-meta, .edu-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Languages List */
.languages-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.lang-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  backdrop-filter: blur(12px);
}

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

.lang-level {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   12. Contact Section & Anti-Scraping Protected Elements
   -------------------------------------------------------------------------- */
.contact-section {
  background: linear-gradient(180deg, transparent 0%, rgba(6, 9, 19, 0.75) 100%);
  padding-bottom: 6rem;
}

.contact-card-main {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  backdrop-filter: blur(16px);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-heading {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.contact-subtext {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  margin-top: 0.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.contact-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Protected Data Link / Action Button */
.protected-action-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.protected-reveal-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.protected-reveal-btn:hover {
  background: var(--accent-cyan-subtle);
  border-color: var(--accent-cyan);
}

.protected-revealed-text {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
  user-select: all;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-textarea {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--border-focus);
}

.form-textarea {
  min-height: 110px;
  resize: vertical;
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 2.5rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a, .footer-links button {
  color: var(--text-secondary);
  font-size: inherit;
}
.footer-links a:hover, .footer-links button:hover {
  color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   14. Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .contact-card-main {
    grid-template-columns: 1fr;
    padding: 2rem;
  }
}

@media (max-width: 768px) {
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-card:not(:last-child)::after {
    display: none;
  }
  .edu-grid-2x2 {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .section-title {
    font-size: 1.85rem;
  }

  /* Mobile Nav */
  .mobile-menu-toggle {
    display: block;
  }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-card);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }
  .nav-menu.is-open {
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .stats-bar {
    grid-template-columns: 1fr;
  }
  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
  }
  .btn {
    width: 100%;
  }
  .timeline {
    padding-left: 0;
  }
  .timeline::before {
    left: 10px;
  }
  .timeline-marker {
    left: 2px;
  }
  .timeline-item {
    padding-left: 2rem;
  }
}