/* ==========================================================================
   Design Tokens & CSS Custom Properties
   ========================================================================== */
:root {
  /* Font Families */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);

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

  /* Layout Container Max Width */
  --container-max-width: 1080px;
  --header-height: 72px;
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-input: #ffffff;
  --bg-badge: #e2e8f0;
  --bg-pill: #ffffff;

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

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-focus: rgba(99, 102, 241, 0.4);
  --border-hover: rgba(99, 102, 241, 0.25);

  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-glow: rgba(79, 70, 229, 0.15);
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --accent-text-gradient: linear-gradient(135deg, #4338ca 0%, #6d28d9 100%);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 4px 8px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 24px rgba(79, 70, 229, 0.12);

  --status-available-bg: rgba(16, 185, 129, 0.1);
  --status-available-text: #047857;
  --status-available-dot: #10b981;

  --tag-bg: #f1f5f9;
  --tag-text: #334155;
  --tag-border: #e2e8f0;

  --nav-bg: rgba(248, 250, 252, 0.85);
  --glass-border: rgba(255, 255, 255, 0.6);
}

/* Dark Theme Variables (Default) */
[data-theme="dark"], :root:not([data-theme="light"]) {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(26, 36, 56, 0.85);
  --bg-input: #1f2937;
  --bg-badge: #1f2937;
  --bg-pill: rgba(31, 41, 55, 0.7);

  --text-primary: #f9fafb;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #0b0f19;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(129, 140, 248, 0.5);
  --border-hover: rgba(129, 140, 248, 0.3);

  --accent-primary: #6366f1;
  --accent-primary-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --accent-text-gradient: linear-gradient(135deg, #818cf8 0%, #a78bfa 50%, #f472b6 100%);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.2);

  --status-available-bg: rgba(16, 185, 129, 0.15);
  --status-available-text: #34d399;
  --status-available-dot: #10b981;

  --tag-bg: rgba(30, 41, 59, 0.8);
  --tag-text: #cbd5e1;
  --tag-border: rgba(255, 255, 255, 0.06);

  --nav-bg: rgba(11, 15, 25, 0.85);
  --glass-border: rgba(255, 255, 255, 0.08);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Background Ambient Glow */
.site-background-glow {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 600px;
  background: radial-gradient(circle 800px at 50% -100px, var(--accent-glow), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  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 {
  color: var(--accent-primary-hover);
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-badge);
  color: var(--text-primary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

/* Container */
.resume-wrapper {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + 2rem) 1.5rem 4rem 1.5rem;
  position: relative;
  z-index: 1;
}

/* Glassmorphism Surface */
.glassmorphism {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.glassmorphism:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Navigation Header
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  max-width: var(--container-max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-avatar-mini {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.875rem;
}

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

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.35rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.nav-link.active {
  color: var(--accent-primary);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.theme-toggle-btn {
  padding: 0.5rem;
  border-radius: var(--radius-full);
}

/* Theme Icon Visibility */
[data-theme="dark"] .sun-icon {
  display: block;
}
[data-theme="dark"] .moon-icon {
  display: none;
}
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: block;
}

.mobile-menu-btn {
  display: none;
  padding: 0.5rem;
}

.mobile-menu-btn .close-icon {
  display: none;
}

/* ==========================================================================
   Hero Profile Section
   ========================================================================== */
.hero-section {
  margin-bottom: 3.5rem;
}

.hero-card {
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}

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

.hero-header {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 1.75rem;
}

.avatar-container {
  position: relative;
  flex-shrink: 0;
}

.avatar-wrapper {
  width: 104px;
  height: 104px;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 3px solid var(--bg-card);
  box-shadow: var(--shadow-md), 0 0 0 2px var(--accent-primary);
  background: var(--bg-secondary);
}

.hero-avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-fallback {
  width: 100%;
  height: 100%;
  background: var(--accent-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 2.25rem;
}

.avatar-status-ring {
  position: absolute;
  bottom: 4px;
  right: 4px;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: var(--status-available-dot);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 10px var(--status-available-dot);
}

.hero-titles {
  flex: 1;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.status-available {
  background: var(--status-available-bg);
  color: var(--status-available-text);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-full);
  background: currentColor;
  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-name {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
  background: var(--accent-text-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-role {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.hero-body {
  margin-bottom: 1.75rem;
}

.hero-bio {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 900px;
}

/* Contact Badges Grid */
.contact-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 2rem;
}

.contact-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  background: var(--bg-pill);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.contact-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

/* Metrics Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.stat-card {
  padding: 1rem;
  background: var(--bg-badge);
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--border-subtle);
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--accent-primary);
  margin-bottom: 0.2rem;
}

.stat-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Section Layouts & Headers
   ========================================================================== */
.resume-section {
  margin-bottom: 4rem;
}

.section-header {
  margin-bottom: 2rem;
}

.section-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 680px;
}

/* Inline Icons */
.icon-inline {
  display: inline-block;
  vertical-align: middle;
  margin-left: 0.25rem;
}

/* Bullet Icons */
.bullet-icon {
  flex-shrink: 0;
  margin-top: 0.25rem;
  color: var(--accent-primary);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  padding: 2.5rem 1.5rem;
  position: relative;
  z-index: 1;
}

.footer-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.back-to-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.back-to-top-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 768px) {
  .hero-header {
    flex-direction: column;
    text-align: center;
    gap: 1.25rem;
  }

  .hero-titles {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-name {
    font-size: 2rem;
  }

  .contact-grid {
    justify-content: center;
  }

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

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-link {
    padding: 0.75rem 1rem;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .mobile-menu-btn[aria-expanded="true"] .hamburger-icon {
    display: none;
  }

  .mobile-menu-btn[aria-expanded="true"] .close-icon {
    display: block;
  }

  .footer-container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}