/* ===== CSS CUSTOM PROPERTIES (THEME VARIABLES) ===== */
:root {
    /* Primary Colors - Deep Teal for Security & Trust */
    --color-primary: #14b8a6;
    --color-primary-hover: #0d9488;
    --color-primary-light: rgba(20, 184, 166, 0.1);
    --color-primary-border: rgba(20, 184, 166, 0.3);
    --color-primary-glow: rgba(20, 184, 166, 0.2);
    
    /* Secondary Accent - Warm Gold for Interest */
    --color-secondary: #f59e0b;
    --color-secondary-hover: #d97706;
    --color-secondary-light: rgba(245, 158, 11, 0.1);
    
    /* Background Colors - Deep Warm Dark */
    --color-bg-primary: #181414;
    --color-bg-secondary: rgba(30, 24, 24, 0.8);
    --color-bg-card: rgba(35, 28, 28, 0.9);
    --color-bg-header: rgba(24, 20, 20, 0.95);
    --color-bg-social: rgba(45, 38, 38, 0.6);
    --color-bg-social-hover: rgba(20, 184, 166, 0.15);
    
    /* Text Colors - Warm & Secure */
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-accent: #14b8a6;
    
    /* Border Colors - Subtle Warm Grays */
    --color-border-primary: rgba(71, 85, 105, 0.3);
    --color-border-card: rgba(71, 85, 105, 0.25);
    --color-border-social: rgba(71, 85, 105, 0.4);
    --color-border-social-hover: rgba(20, 184, 166, 0.5);
    --color-border-image: rgba(20, 184, 166, 0.4);
    
    /* Shadow Colors - Deep & Secure */
    --shadow-primary: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-primary-hover: 0 15px 35px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(20, 184, 166, 0.1);
    --shadow-glow-hover: 0 0 60px rgba(20, 184, 166, 0.2);
    --shadow-social: 0 10px 20px rgba(0, 0, 0, 0.3);
    --shadow-social-glow: 0 0 30px rgba(20, 184, 166, 0.25);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typography */
    --font-family-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 0.8rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Sizes */
    --size-social-icon: 60px;
    --size-social-icon-mobile: 50px;
    --size-profile-image: 200px;
    --size-profile-image-mobile: 150px;
    --max-width-content: 1200px;
    --max-width-text: 800px;
  }
  
  /* ===== ALTERNATIVE THEME: SECURITY BLUE ===== */
  /*
  :root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-text-accent: #2563eb;
    --color-secondary: #7c3aed;
    --color-secondary-hover: #6d28d9;
  }
  */
  
  /* ===== ALTERNATIVE THEME: WARM SECURITY ===== */
  /*
  :root {
    --color-primary: #dc2626;
    --color-primary-hover: #b91c1c;
    --color-text-accent: #dc2626;
    --color-secondary: #ea580c;
    --color-secondary-hover: #c2410c;
  }
  */
  
  /* ===== ALTERNATIVE THEME: PROFESSIONAL PURPLE ===== */
  /*
  :root {
    --color-primary: #7c3aed;
    --color-primary-hover: #6d28d9;
    --color-text-accent: #7c3aed;
    --color-secondary: #c026d3;
    --color-secondary-hover: #a21caf;
  }
  */
  
  /* ===== CSS RESET & BASE STYLES ===== */
  *,
  *::before,
  *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
  }
  
  html {
      font-size: 16px;
      scroll-behavior: smooth;
  }
  
  body {
      font-family: var(--font-family-primary);
      line-height: 1.6;
      color: var(--color-text-secondary);
      background-color: var(--color-bg-primary);
      min-height: 100vh;
  }
  
  /* ===== TYPOGRAPHY ===== */
  h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      line-height: 1.2;
      color: var(--color-text-primary);
  }
  
  p {
      margin-bottom: var(--spacing-md);
      color: var(--color-text-secondary);
  }
  
  a {
      color: var(--color-primary);
      text-decoration: none;
      transition: color var(--transition-normal), opacity var(--transition-normal);
  }
  
  a:hover {
      color: var(--color-primary-hover);
      opacity: 0.8;
  }
  
  /* ===== HEADER & NAVIGATION ===== */
  .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--color-bg-header);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--color-border-primary);
      padding: var(--spacing-md) 0;
  }
  
  .nav {
      max-width: var(--max-width-content);
      margin: 0 auto;
      padding: 0 var(--spacing-xl);
      display: flex;
      justify-content: space-between;
      align-items: center;
  }
  
  .nav-brand {
      display: flex;
      flex-direction: column;
      gap: var(--spacing-xs);
  }
  
  .logo a {
      font-size: var(--font-size-2xl);
      font-weight: 700;
      color: var(--color-primary);
      text-decoration: none;
  }
  
  .tagline {
      font-size: var(--font-size-sm);
      color: var(--color-text-muted);
      font-style: italic;
      margin: 0;
  }
  
  .nav-links {
      display: flex;
      gap: var(--spacing-xl);
  }
  
  .nav-link {
      font-weight: 500;
      color: var(--color-text-secondary);
      transition: color var(--transition-normal);
      position: relative;
  }
  
  .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-primary);
      transition: width var(--transition-normal);
  }
  
  .nav-link:hover {
      color: var(--color-primary);
  }
  
  .nav-link:hover::after {
      width: 100%;
  }
  
  /* ===== MAIN CONTENT ===== */
  .main {
      max-width: var(--max-width-content);
      margin: 0 auto;
      padding: var(--spacing-xl);
  }
  
  /* ===== HERO SECTION ===== */
  .hero {
      padding: var(--spacing-3xl) 0;
  }
  
  .hero-content {
      display: flex;
      flex-direction: column;
      gap: var(--spacing-2xl);
      
  }
  
  .hero-subtitle {
      font-size: var(--font-size-lg);
      color: var(--color-text-accent);
      margin-bottom: var(--spacing-xl);
      font-weight: 500;
  }
  
  .welcome-section {
      /* background: var(--color-bg-card);
      border: 1px solid var(--color-border-card);
      border-radius: var(--radius-lg); */
      padding: var(--spacing-xl);
      backdrop-filter: blur(10px);
  }
  
  .welcome-title {
      font-size: var(--font-size-4xl);
      margin-bottom: var(--spacing-lg);
      color: var(--color-text-primary);
  }
  
  .intro-text p {
      font-size: var(--font-size-base);
      line-height: 1.7;
      color: var(--color-text-secondary);
      margin-bottom: 1.25rem;
  }
  
  .intro-text p:last-child {
      margin-bottom: 0;
  }
  
  /* ===== HERO IMAGE ===== */
  .hero-image {
      display: flex;
      justify-content: center;
      align-items: center;
      margin: var(--spacing-xl) 0;
  }
  
  .profile-image {
      width: var(--size-profile-image);
      height: var(--size-profile-image);
      border-radius: var(--radius-full);
      object-fit: cover;
      border: 3px solid var(--color-border-image);
      box-shadow: 
          var(--shadow-primary),
          var(--shadow-glow);
      transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  }
  
  .profile-image:hover {
      transform: scale(1.05);
      box-shadow: 
          var(--shadow-primary-hover),
          var(--shadow-glow-hover);
  }
  
  /* ===== SOCIAL SECTION ===== */
  .social-section {
      text-align: center;
      padding: 3rem 0;
      border-top: 1px solid rgba(75, 85, 99, 0.3);
      margin-top: 3rem;
  }
  
  .social-intro {
      font-size: 1.125rem;
      color: #d1d5db;
      margin-bottom: 2rem;
  }
  
  .social-links {
      display: flex;
      justify-content: center;
      gap: 2rem;
      flex-wrap: wrap;
  }
  
  .social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: rgba(75, 85, 99, 0.2);
    border: 2px solid rgba(75, 85, 99, 0.3);
    border-radius: 50%;
    color: #d1d5db;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.social-link:hover {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.4);
    transform: translateY(-4px) scale(1.1);
    box-shadow: 
        0 10px 20px rgba(0, 0, 0, 0.2),
        0 0 30px rgba(245, 158, 11, 0.2);
    color: #f59e0b;
});
    transform: translateY(-4px) scale(1.1);
    box-shadow: 
        0 10px 20px rgba(0, 0, 0, 0.2),
        0 0 30px rgba(56, 189, 248, 0.3);
    color: #0ea5e9;
}
  
  .social-link svg {
      width: 24px;
      height: 24px;
      transition: transform 0.3s ease;
  }
  
  .social-link:hover svg {
      transform: rotate(5deg);
  }
  
  /* ===== FOOTER ===== */
  .footer {
      text-align: center;
      padding: var(--spacing-xl);
      border-top: 1px solid var(--color-border-primary);
      margin-top: var(--spacing-3xl);
      color: var(--color-text-muted);
      font-size: var(--font-size-sm);
  }
  
  /* ===== RESPONSIVE DESIGN ===== */
  @media (max-width: 768px) {
      .nav {
          flex-direction: column;
          gap: var(--spacing-md);
          text-align: center;
      }
      
      .nav-links {
          gap: var(--spacing-lg);
      }
      
      .main {
          padding: var(--spacing-md);
      }
      
      .hero {
          padding: var(--spacing-xl) 0;
      }
      
      .hero-content {
          gap: var(--spacing-xl);
      }
      
      .profile-image {
          width: var(--size-profile-image-mobile);
          height: var(--size-profile-image-mobile);
      }
      
      .welcome-section {
          padding: var(--spacing-lg);
      }
      
      .welcome-title {
          font-size: var(--font-size-3xl);
      }
      
      .intro-text p {
          font-size: 0.95rem;
      }
      
      .social-links {
          gap: var(--spacing-lg);
      }
      
      .social-link {
          width: var(--size-social-icon-mobile);
          height: var(--size-social-icon-mobile);
      }
      
      .social-link svg {
          width: 20px;
          height: 20px;
      }
  }
  
  @media (max-width: 480px) {
      .nav {
          padding: 0 var(--spacing-md);
      }
      
      .logo a {
          font-size: var(--font-size-xl);
      }
      
      .tagline {
          font-size: var(--font-size-xs);
      }
      
      .welcome-section {
          padding: var(--spacing-md);
      }
      
      .welcome-title {
          font-size: var(--font-size-2xl);
      }
      
      .social-links {
          gap: var(--spacing-md);
      }
  }
  
  /* ===== ACCESSIBILITY & FOCUS STATES ===== */
  *:focus {
      outline: 2px solid var(--color-primary);
      outline-offset: 2px;
  }
  
  .nav-link:focus,
  .social-link:focus {
      outline: 2px solid var(--color-primary);
      outline-offset: 4px;
  }
  
  /* ===== ANIMATIONS ===== */
  @keyframes fadeInUp {
      from {
          opacity: 0;
          transform: translateY(20px);
      }
      to {
          opacity: 1;
          transform: translateY(0);
      }
  }
  
  .hero-content > * {
      animation: fadeInUp 0.8s ease-out;
  }
  
  .hero-image {
      animation: fadeInUp 0.8s ease-out 0.2s both;
  }
  
  .social-section {
      animation: fadeInUp 0.8s ease-out 0.4s both;
  }
  
  /* ===== PERFORMANCE OPTIMIZATIONS ===== */
  .profile-image {
      will-change: transform;
  }
  
  .social-link {
      will-change: transform;
  }
  
  @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
          animation-duration: 0.01ms !important;
          animation-iteration-count: 1 !important;
          transition-duration: 0.01ms !important;
      }
      
      html {
          scroll-behavior: auto;
      }
  }