/* ==========================================================================
   THOMAS SAPP PORTFOLIO - MODERN DESIGN SYSTEM & ACCESSIBLE STYLES
   Vanilla CSS with CSS Custom Properties, Dark/Light Themes, WCAG AA+
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens & CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-base: #0a0f1d;
  --bg-surface: #111827;
  --bg-surface-elevated: #1e293b;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(30, 41, 59, 0.95);
  --bg-glass: rgba(15, 23, 42, 0.75);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-strong: rgba(255, 255, 255, 0.28);

  /* Accents */
  --accent-primary: #38bdf8;       /* Sky 400 */
  --accent-secondary: #6366f1;     /* Indigo 500 */
  --accent-tertiary: #a855f7;      /* Purple 500 */
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #a855f7 100%);
  --accent-glow: rgba(56, 189, 248, 0.25);

  --status-available: #10b981;     /* Emerald 500 */
  --status-available-glow: rgba(16, 185, 129, 0.35);
  --status-error: #ef4444;
  --status-warning: #f59e0b;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Spacing Scale */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 35px var(--accent-glow);

  /* Border Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Container */
  --container-max-w: 1200px;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.82);

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

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-medium: rgba(15, 23, 42, 0.16);
  --border-strong: rgba(15, 23, 42, 0.28);

  --accent-primary: #0284c7;       /* Sky 600 */
  --accent-secondary: #4f46e5;     /* Indigo 600 */
  --accent-tertiary: #9333ea;      /* Purple 600 */
  --accent-glow: rgba(2, 132, 199, 0.2);

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 8px -2px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 20px -4px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.12), 0 8px 10px -6px rgba(15, 23, 42, 0.06);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
  color-scheme: dark light;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image:
    radial-gradient(at 10% 20%, rgba(56, 189, 248, 0.07) 0px, transparent 50%),
    radial-gradient(at 90% 80%, rgba(99, 102, 241, 0.07) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(168, 85, 247, 0.04) 0px, transparent 50%);
  background-attachment: fixed;
}

/* Accessible Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1.25rem;
  background-color: var(--accent-primary);
  color: #0f172a;
  font-weight: 700;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 1rem;
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}

/* Visually Hidden Utility for Screen Readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* General Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

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

/* Focus Visible for Accessibility */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1rem, 4vw, 2rem);
  padding-right: clamp(1rem, 4vw, 2rem);
}

.section {
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-4xl);
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-3xl) auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.35rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  margin-bottom: var(--space-sm);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-normal), border var(--transition-normal);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.brand-link:hover {
  text-decoration: none;
}

.brand-monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 800;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.brand-name span {
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  padding: 0.5rem 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--border-subtle);
  text-decoration: none;
}

.nav-link.active {
  color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.1);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}
.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}
.theme-toggle-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* Mobile Menu Toggle */
.mobile-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
}
.mobile-nav-toggle svg {
  width: 1.5rem;
  height: 1.5rem;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.4rem 0.95rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--status-available);
  margin-bottom: var(--space-lg);
}

.status-beacon {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background-color: var(--status-available);
  box-shadow: 0 0 10px var(--status-available);
  animation: pulse-beacon 2s infinite;
}

@keyframes pulse-beacon {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
}

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

.hero-roles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.role-badge {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
}

.hero-bio {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

/* Button Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-glow);
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}
.btn-secondary:hover {
  background: var(--bg-surface);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

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

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.8125rem;
}

.btn svg {
  width: 1.125rem;
  height: 1.125rem;
  fill: currentColor;
}

/* Social Icon Row */
.hero-social-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.hero-social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.hero-social-link:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  background: var(--bg-surface-elevated);
}
.hero-social-link svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

/* Hero Profile Card */
.hero-card {
  position: relative;
  border-radius: var(--radius-xl);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: var(--space-xl);
  box-shadow: var(--shadow-xl);
}

.hero-card-glow {
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  background: var(--accent-gradient);
  opacity: 0.15;
  filter: blur(16px);
  z-index: -1;
  transition: opacity var(--transition-normal);
}
.hero-card:hover .hero-card-glow {
  opacity: 0.28;
}

.hero-photo-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  transition: transform var(--transition-slow);
}
.hero-card:hover .hero-photo {
  transform: scale(1.03);
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  text-align: center;
}

.stat-box {
  padding: var(--space-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.stat-value {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   GitHub Integration Section
   -------------------------------------------------------------------------- */
.github-section {
  background: rgba(17, 24, 39, 0.4);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.github-sync-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}
.github-sync-status .sync-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--status-available);
}

.github-profile-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.github-profile-user {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.github-avatar {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  border: 2px solid var(--accent-primary);
}

.github-user-info h3 {
  font-size: 1.2rem;
  margin-bottom: 2px;
}
.github-user-info p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.github-profile-metrics {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.github-metric {
  text-align: center;
}
.github-metric-num {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}
.github-metric-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
}

.repos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.repo-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}
.repo-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-lg);
}

.repo-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.repo-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  word-break: break-word;
}
.repo-card:hover .repo-name {
  color: var(--accent-primary);
}

.repo-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.repo-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.repo-lang {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.lang-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.lang-cpp { background-color: #f34b7d; }
.lang-python { background-color: #3572a5; }
.lang-csharp { background-color: #178600; }
.lang-javascript { background-color: #f1e05a; }
.lang-html { background-color: #e34c26; }
.lang-powershell { background-color: #012456; }
.lang-php { background-color: #4f5d95; }
.lang-default { background-color: #38bdf8; }

.repo-stats {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.repo-stat-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.repo-stat-item svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

/* --------------------------------------------------------------------------
   Projects Section
   -------------------------------------------------------------------------- */
.projects-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
}

.filter-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}
.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}
.filter-btn.active {
  color: #ffffff;
  background: var(--accent-gradient);
  border-color: transparent;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-xl);
}

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

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-xl);
}

.project-thumb-container {
  position: relative;
  width: 100%;
  height: 200px;
  background: var(--bg-surface-elevated);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}
.project-card:hover .project-thumb {
  transform: scale(1.05);
}

.project-placeholder-banner {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
  color: var(--accent-primary);
}
.project-placeholder-banner svg {
  width: 3rem;
  height: 3rem;
  stroke: currentColor;
  fill: none;
}
.project-placeholder-banner span {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.project-category-badge {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.project-year-badge {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  color: var(--text-secondary);
}

.project-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: 0.35rem;
}

.project-tagline {
  font-size: 0.875rem;
  color: var(--accent-primary);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.project-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: var(--space-lg);
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

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

.project-links-group {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* --------------------------------------------------------------------------
   Resume & Experience Section
   -------------------------------------------------------------------------- */
.resume-section {
  background: rgba(17, 24, 39, 0.3);
}

.resume-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.block-heading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.5rem;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--border-subtle);
}
.block-heading svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: var(--accent-primary);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 2px;
  background: var(--border-medium);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-2xl);
}
.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  top: 5px;
  left: calc(-1 * var(--space-xl) + 2px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-base);
  border: 3px solid var(--accent-primary);
}

.timeline-item.current .timeline-marker {
  background: var(--status-available);
  border-color: var(--status-available);
  box-shadow: 0 0 8px var(--status-available);
}

.timeline-header {
  margin-bottom: var(--space-xs);
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-company {
  font-size: 0.9375rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

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

.timeline-highlights {
  list-style: disc;
  padding-left: 1.25rem;
  margin-bottom: var(--space-sm);
}
.timeline-highlights li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

.timeline-techs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

/* Education & Certifications cards */
.edu-card {
  padding: var(--space-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}
.edu-card h4 {
  font-size: 1.05rem;
  color: var(--text-primary);
}
.edu-card .edu-inst {
  font-size: 0.875rem;
  color: var(--accent-primary);
  font-weight: 600;
}
.edu-card .edu-meta {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.cert-card {
  padding: var(--space-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
}
.cert-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #818cf8;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.cert-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.cert-issuer {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Skills Matrix */
.skills-container {
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border-subtle);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-xl);
}

.skill-category-card {
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.skill-cat-title {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}
.skill-cat-title svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: var(--accent-primary);
}

.skill-pills {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skill-pill-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.75rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
}
.skill-name {
  font-weight: 500;
  color: var(--text-primary);
}
.skill-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-primary);
}

/* Resume CTA Banner */
.resume-download-banner {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.8));
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.resume-download-banner h3 {
  font-size: 1.35rem;
  margin-bottom: 4px;
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-3xl);
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-card-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}
.contact-card-item:hover {
  border-color: var(--accent-primary);
  transform: translateX(4px);
}

.contact-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-primary);
  flex-shrink: 0;
}
.contact-card-icon svg {
  width: 1.35rem;
  height: 1.35rem;
  fill: currentColor;
}

.contact-card-content h4 {
  font-size: 1rem;
  margin-bottom: 2px;
}
.contact-card-content p, .contact-card-content a {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}
.contact-card-content a:hover {
  color: var(--accent-primary);
}

.copy-email-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  margin-left: var(--space-xs);
  cursor: pointer;
}
.copy-email-btn:hover {
  background: rgba(56, 189, 248, 0.2);
}

/* Contact Form */
.contact-form-card {
  padding: var(--space-2xl);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

.contact-form-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
}
.contact-form-card p {
  margin-bottom: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}
.form-label .required {
  color: var(--status-error);
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.25);
}

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

/* Honeypot field for bot detection (must stay invisible) */
.honeypot-field {
  opacity: 0;
  position: absolute;
  top: 0;
  left: 0;
  height: 0;
  width: 0;
  z-index: -1;
  pointer-events: none;
}

.form-feedback {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
  display: none;
}
.form-feedback.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
}
.form-feedback.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
}

/* --------------------------------------------------------------------------
   Interactive Modal (Project Case Study)
   -------------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  position: relative;
  width: 100%;
  max-width: 720px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-backdrop.is-open .modal-dialog {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: var(--space-xl) var(--space-xl) var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border-subtle);
}

.modal-close-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}
.modal-close-btn:hover {
  color: var(--text-primary);
  background: var(--border-medium);
}

.modal-body {
  padding: var(--space-xl);
}

.modal-thumb {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  border: 1px solid var(--border-subtle);
}

.modal-highlights-title {
  font-size: 1rem;
  font-weight: 700;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.modal-highlights-list {
  list-style: disc;
  padding-left: 1.25rem;
  margin-bottom: var(--space-lg);
}
.modal-highlights-list li {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 0.35rem;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl) var(--space-xl) var(--space-xl);
  border-top: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  padding: var(--space-3xl) 0 var(--space-2xl) 0;
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand {
  max-width: 380px;
}
.footer-brand p {
  font-size: 0.875rem;
  margin-top: var(--space-xs);
}

.footer-nav {
  display: flex;
  gap: var(--space-lg);
}
.footer-nav a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}
.footer-nav a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
  .hero-card {
    max-width: 480px;
    margin: 0 auto;
  }
  .resume-layout {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
}

@media (max-width: 768px) {
  .mobile-nav-toggle {
    display: inline-flex;
  }
  .nav-links {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-xs);
    box-shadow: var(--shadow-xl);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }
  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 0.75rem;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* --------------------------------------------------------------------------
   Accessibility & Reduced Motion Preferences
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .status-beacon {
    animation: none;
  }
}