/* ==========================================================================
   GHEORGHE CRACIUN - PORTFOLIO DESIGN SYSTEM & STYLESHEET
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Root Variables & Themes
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Lighter Modern Theme (Default) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(248, 250, 252, 0.85);
  --bg-glass-card: rgba(255, 255, 255, 0.8);
  --bg-glass-hover: rgba(255, 255, 255, 0.95);

  --border-color: rgba(15, 23, 42, 0.08);
  --border-focus: rgba(79, 70, 229, 0.4);

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

  --accent-primary: #4f46e5; /* Indigo-600 */
  --accent-secondary: #0284c7; /* Cyan-600 */
  --accent-tertiary: #9333ea; /* Purple-600 */
  --accent-glow: rgba(79, 70, 229, 0.15);
  --accent-cyan-glow: rgba(2, 132, 199, 0.15);

  --gradient-accent: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  --gradient-glow: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(2, 132, 199, 0.1));

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-code: 'Fira Code', monospace;

  /* Layout & Spacing */
  --container-max-width: 1200px;
  --header-height: 80px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* Transitions & Shadows */
  --transition-fast: 0.2s 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(0.4, 0, 0.2, 1);
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 30px -5px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 35px var(--accent-glow);
}

[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-glass: rgba(17, 24, 39, 0.75);
  --bg-glass-card: rgba(255, 255, 255, 0.04);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);

  --border-color: rgba(255, 255, 255, 0.09);
  --border-focus: rgba(99, 102, 241, 0.5);

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

  --accent-primary: #6366f1;
  --accent-secondary: #38bdf8;
  --accent-tertiary: #c084fc;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-cyan-glow: rgba(56, 189, 248, 0.25);
  --shadow-md: 0 10px 30px -5px rgba(0, 0, 0, 0.35);
}

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

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

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

/* Canvas Background */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography Base */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

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

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

.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  padding-bottom: 0.15em;
  margin-bottom: -0.12em;
  padding-right: 0.05em;
}

/* --------------------------------------------------------------------------
   3. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, backdrop-filter 0.25s ease;
}

.site-header.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 2rem;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-primary);
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: 0 0 15px var(--accent-glow);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  background: var(--bg-glass-card);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  transition: color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
}

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

.nav-link.active {
  color: #ffffff !important;
  background-color: var(--accent-primary) !important;
  background-image: var(--gradient-accent) !important;
  box-shadow: 0 2px 10px var(--accent-glow);
}

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

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

.theme-toggle-btn {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

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

/* --------------------------------------------------------------------------
   4. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #ffffff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--accent-primary);
  transform: translateY(-3px);
  color: var(--text-primary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-secondary);
}

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

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

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  min-height: 100vh;
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 5rem;
  display: flex;
  align-items: center;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.8rem;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-top: 0.4rem;
  margin-bottom: 0.4rem;
  padding-bottom: 0.25rem;
}

.hero-subtitle, .hero-intro {
  font-size: clamp(1rem, 1.8vw, 1.1rem);
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 660px;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.hero-intro p {
  line-height: 1.7;
}

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

.hero-socials {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-top: 0.5rem;
}

.social-icon-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.social-icon-btn:hover {
  color: var(--accent-secondary);
  border-color: var(--accent-secondary);
  background: var(--bg-glass-hover);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(56, 189, 248, 0.2);
}

.hero-card-wrapper {
  position: relative;
}

.hero-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

.code-block {
  font-family: var(--font-code);
  font-size: 0.9rem;
  line-height: 1.7;
}

.code-line {
  display: flex;
  gap: 1rem;
}

.code-num {
  color: var(--text-muted);
  user-select: none;

  min-width: 20px;
}

.code-key { color: var(--accent-primary); }
.code-str { color: #047857; }
.code-num-val { color: #d97706; }
.code-arr { color: #7e22ce; }

[data-theme="dark"] .code-key { color: var(--accent-secondary); }
[data-theme="dark"] .code-str { color: #a7f3d0; }
[data-theme="dark"] .code-num-val { color: #fde047; }
[data-theme="dark"] .code-arr { color: #c084fc; }

/* --------------------------------------------------------------------------
   6. Metrics Bar
   -------------------------------------------------------------------------- */
.metrics-section {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  backdrop-filter: blur(10px);
}

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

.metric-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.3rem;
}

.metric-value {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-heading);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.metric-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   7. Sections Common Layout
   -------------------------------------------------------------------------- */
.section {
  padding: 6rem 0;
  position: relative;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 4rem auto;
}

.section-tag {
  font-family: var(--font-code);
  font-size: 0.85rem;
  color: var(--accent-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

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

/* --------------------------------------------------------------------------
   8. Experience Timeline
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary), transparent);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 3rem;
}

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

.timeline-marker {
  position: absolute;
  left: 9px;
  top: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-primary);
  box-shadow: 0 0 15px var(--accent-glow);
  z-index: 2;
  transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-marker {
  background: var(--accent-secondary);
  border-color: var(--accent-secondary);
  transform: scale(1.2);
}

.timeline-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.role-title {
  font-size: 1.35rem;
  margin-bottom: 0.2rem;
}

.company-name {
  font-size: 1.05rem;
  color: var(--accent-secondary);
  font-weight: 600;
}

.role-badge {
  font-size: 0.85rem;
  font-family: var(--font-code);
  color: var(--text-secondary);
  background: var(--bg-glass);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.timeline-bullet-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.timeline-bullet-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.timeline-bullet-list li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: bold;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border-color);
}

.tech-tag {
  font-family: var(--font-code);
  font-size: 0.78rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent-secondary);
}

/* --------------------------------------------------------------------------
   9. Technical Skills Matrix
   -------------------------------------------------------------------------- */
.skills-filter {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 3rem;
}

.filter-btn {
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-full);
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--gradient-accent);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-card:hover {
  border-color: var(--accent-secondary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), 0 0 20px var(--accent-cyan-glow);
}

.skill-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.skill-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-secondary);
  font-size: 1.4rem;
}

.skill-name {
  font-size: 1.15rem;
}

.skill-badge {
  margin-left: auto;
  font-family: var(--font-code);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

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

/* --------------------------------------------------------------------------
   10. Architecture & Specializations
   -------------------------------------------------------------------------- */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.arch-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  transition: all var(--transition-normal);
}

.arch-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.arch-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--gradient-glow);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--accent-secondary);
  margin-bottom: 1.5rem;
}

.arch-title {
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
}

.arch-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   11. Languages & Education
   -------------------------------------------------------------------------- */
.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.info-box {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.info-box-title {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.language-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.lang-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.lang-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  font-weight: 500;
}

.lang-name { color: var(--text-primary); }
.lang-level { color: var(--accent-secondary); font-family: var(--font-code); font-size: 0.85rem; }

.lang-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.lang-progress {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  transition: width 1s ease-out;
}

/* --------------------------------------------------------------------------
   12. Contact Modal / Section
   -------------------------------------------------------------------------- */
.contact-section {
  text-align: center;
  background: linear-gradient(180deg, transparent, rgba(99, 102, 241, 0.05));
  border-top: 1px solid var(--border-color);
  padding: 7rem 0 5rem 0;
}

.contact-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  max-width: 750px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
}

.contact-title {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.contact-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.copy-email-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.6rem 0.6rem 0.6rem 1.4rem;
  border-radius: var(--radius-full);
  margin-bottom: 2rem;
}

.email-address {
  font-family: var(--font-code);
  color: var(--text-primary);
  font-size: 0.95rem;
}

/* Toast notification */
.toast-msg {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--accent-primary);
  padding: 0.8rem 1.4rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 2000;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
}

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

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* --------------------------------------------------------------------------
   14. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

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

  .two-col-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 2rem 0;
    clip-path: circle(0% at 100% 0%);
    transition: clip-path 0.4s ease-in-out;
  }

  .nav-menu.open {
    clip-path: circle(141.4% at 100% 0%);
  }

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

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

  .timeline::before {
    left: 15px;
  }

  .timeline-item {
    padding-left: 45px;
  }

  .timeline-marker {
    left: 4px;
  }

  .footer-content {
    flex-direction: column;
    justify-content: center;
  }
}