/* ==========================================
   CSS Architecture - Cascade Layers Setup
   ========================================== */
@layer reset, base, theme, components, utilities;

@layer reset {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
  }
  
  body {
    min-height: 100vh;
    text-rendering: optimizeSpeed;
    line-height: 1.5;
    overflow-x: hidden;
  }

  img, picture, svg, video {
    display: block;
    max-width: 100%;
    height: auto;
  }

  button, input, select, textarea {
    font: inherit;
    color: inherit;
    background: none;
    border: none;
  }

  a {
    text-decoration: none;
    color: inherit;
  }
  
  ul, ol {
    list-style: none;
  }
}

@layer base {
  :root {
    --font-heading: 'Outfit', 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    --font-body: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Responsive Spacing variables */
    --space-xs: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
    --space-sm: clamp(0.75rem, 0.6rem + 0.75vw, 1.25rem);
    --space-md: clamp(1.25rem, 1rem + 1.25vw, 2rem);
    --space-lg: clamp(2rem, 1.6rem + 2vw, 3.5rem);
    --space-xl: clamp(3.5rem, 2.8rem + 3.5vw, 6rem);
    
    --header-height-initial: 90px;
    --header-height-shrink: 65px;
    
    /* Transition defaults */
    --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);
    --transition-bounce: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  }

  body {
    font-family: var(--font-body);
    font-size: clamp(0.95rem, 0.9rem + 0.25vw, 1.1rem);
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: background-color var(--transition-normal), color var(--transition-normal);
  }

  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.15;
    color: var(--color-heading);
  }
  
  /* Focus Visible styling */
  :focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
  }
}

@layer theme {
  /* ==========================================
     Design Tokens (Tier 2-3) & Theme Management
     ========================================== */
  
  :root, :root[data-theme="dark"] {
    color-scheme: dark;
    
    /* Backgrounds */
    --color-bg: #07090e;
    --color-bg-alt: #0b0e14;
    --color-surface: #0f141e;
    --color-surface-hover: #161e2b;
    --color-card-border: rgba(255, 255, 255, 0.05);
    
    /* Typography colors */
    --color-heading: #f3f4f6;
    --color-text: #d1d5db;
    --color-text-muted: #9ca3af;
    --color-accent-text: #ffffff;
    
    /* Accent Palette */
    --color-accent: #a855f7; /* Violet */
    --color-accent-light: rgba(168, 85, 247, 0.15);
    --color-accent-glow: rgba(168, 85, 247, 0.35);
    
    --color-accent-sec: #06b6d4; /* Cyan */
    --color-accent-sec-light: rgba(6, 182, 212, 0.15);
    
    --color-accent-ter: #f87171; /* Coral */
    --color-accent-ter-light: rgba(248, 113, 113, 0.15);
    
    /* Specific Accent Variables mapped to projects */
    --color-purple-accent: #a855f7;
    --color-coral-accent: #ff6b6b;
    --color-cyan-accent: #06b6d4;
    
    /* Header variables */
    --header-bg-initial: rgba(7, 9, 14, 0.5);
    --header-bg-shrink: rgba(7, 9, 14, 0.85);
    --header-border-initial: rgba(255, 255, 255, 0.03);
    --header-border-shrink: rgba(255, 255, 255, 0.08);
    --header-padding-initial: 1.25rem;
    --header-padding-shrink: 0.75rem;
    
    /* Dialog colors */
    --dialog-bg: #0f141e;
    --dialog-border: rgba(255, 255, 255, 0.08);
    --dialog-backdrop-bg: rgba(0, 0, 0, 0.65);
    --dialog-tab-active: rgba(255, 255, 255, 0.05);
    
    /* Scrollbar */
    --color-scrollbar-track: #07090e;
    --color-scrollbar-thumb: #1f2937;
    
    /* 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 -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px 2px rgba(168, 85, 247, 0.15);
  }

  :root[data-theme="light"] {
    color-scheme: light;
    
    /* Backgrounds */
    --color-bg: #f8fafc;
    --color-bg-alt: #f1f5f9;
    --color-surface: #ffffff;
    --color-surface-hover: #f8fafc;
    --color-card-border: rgba(0, 0, 0, 0.05);
    
    /* Typography colors */
    --color-heading: #0f172a;
    --color-text: #334155;
    --color-text-muted: #64748b;
    --color-accent-text: #ffffff;
    
    /* Accent Palette */
    --color-accent: #7c3aed; /* Violet (darker for contrast) */
    --color-accent-light: rgba(124, 58, 237, 0.08);
    --color-accent-glow: rgba(124, 58, 237, 0.15);
    
    --color-accent-sec: #0891b2; /* Cyan */
    --color-accent-sec-light: rgba(8, 145, 178, 0.08);
    
    --color-accent-ter: #ea580c; /* Orange/Coral */
    --color-accent-ter-light: rgba(234, 88, 12, 0.08);
    
    --color-purple-accent: #7c3aed;
    --color-coral-accent: #e11d48;
    --color-cyan-accent: #0891b2;
    
    /* Header variables */
    --header-bg-initial: rgba(248, 250, 252, 0.5);
    --header-bg-shrink: rgba(248, 250, 252, 0.85);
    --header-border-initial: rgba(0, 0, 0, 0.02);
    --header-border-shrink: rgba(0, 0, 0, 0.08);
    --header-padding-initial: 1.25rem;
    --header-padding-shrink: 0.75rem;
    
    /* Dialog colors */
    --dialog-bg: #ffffff;
    --dialog-border: rgba(0, 0, 0, 0.08);
    --dialog-backdrop-bg: rgba(15, 23, 42, 0.45);
    --dialog-tab-active: rgba(0, 0, 0, 0.03);
    
    /* Scrollbar */
    --color-scrollbar-track: #f8fafc;
    --color-scrollbar-thumb: #cbd5e1;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px 2px rgba(124, 58, 237, 0.08);
  }
  
  /* Apply scrollbar properties dynamically */
  :root {
    scrollbar-color: var(--color-scrollbar-thumb) var(--color-scrollbar-track);
    scrollbar-width: auto;
  }
}

@layer components {
  /* ==========================================
     Shared Component Styles (Buttons, Containers)
     ========================================== */
  
  .container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: var(--space-md);
  }
  
  /* Custom Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: transform var(--transition-bounce), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  }
  
  .btn-primary {
    background-color: var(--color-accent);
    color: var(--color-accent-text);
    box-shadow: 0 4px 14px 0 rgba(168, 85, 247, 0.25);
  }
  
  .btn-primary:hover {
    transform: translateY(-2px);
    background-color: light-dark(oklch(from var(--color-accent) calc(l - 0.08) c h), oklch(from var(--color-accent) calc(l + 0.08) c h));
    box-shadow: 0 6px 20px 0 rgba(168, 85, 247, 0.35);
  }
  
  .btn-primary:active {
    transform: translateY(0);
  }
  
  .btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-card-border);
  }
  
  .btn-secondary:hover {
    transform: translateY(-2px);
    background-color: var(--color-accent-light);
    border-color: var(--color-accent);
  }
  
  .btn-secondary:active {
    transform: translateY(0);
  }

  /* Utility Text Gradient */
  .gradient-text {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-sec));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  
  /* Section Header Styling */
  .section-title {
    font-size: clamp(2rem, 1.8rem + 1.5vw, 3rem);
    text-align: center;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.02em;
  }
  
  .section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    max-width: 650px;
    margin-inline: auto;
    margin-bottom: var(--space-lg);
    font-size: clamp(1rem, 0.95rem + 0.1vw, 1.15rem);
  }

  /* ==========================================
     Header & Navigation Styling
     ========================================== */
  
  .scroll-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--color-accent), var(--color-accent-sec));
    transform-origin: 0 50%;
    transform: scaleX(0);
    z-index: 1000;
  }

  #main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding-block: var(--header-padding-initial);
    background-color: var(--header-bg-initial);
    border-bottom: 1px solid var(--header-border-initial);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: 
      background-color var(--transition-normal), 
      padding-block var(--transition-normal), 
      border-bottom-color var(--transition-normal);
  }

  /* Class dynamically toggled by scroll fallback */
  #main-header.scrolled {
    padding-block: var(--header-padding-shrink);
    background-color: var(--header-bg-shrink);
    border-bottom-color: var(--header-border-shrink);
    box-shadow: 0 4px 20px -5px rgba(0, 0, 0, 0.15);
  }

  .header-container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .logo-link {
    display: flex;
    align-items: center;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.35rem;
    letter-spacing: -0.03em;
    color: var(--color-heading);
  }
  
  .logo-dot {
    color: var(--color-accent);
  }

  .nav-list {
    display: flex;
    gap: 2rem;
  }

  .nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    padding: 0.25rem 0.5rem;
    position: relative;
  }

  .nav-link:hover {
    color: var(--color-heading);
  }
  
  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-fast) ease, left var(--transition-fast) ease;
  }
  
  .nav-link:hover::after {
    width: 80%;
    left: 10%;
  }

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

  .theme-toggle-btn {
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--color-card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
  }

  .theme-toggle-btn:hover {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent);
    color: var(--color-accent);
  }

  /* Display SVG based on theme */
  .sun-icon { display: none; width: 1.2rem; height: 1.2rem; }
  .moon-icon { display: block; width: 1.2rem; height: 1.2rem; }

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

  .mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
  }

  .menu-bar {
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  /* ==========================================
     Hero Section Styling
     ========================================== */
  
  .hero-section {
    position: relative;
    padding-top: calc(var(--header-height-initial) + var(--space-xl));
    padding-bottom: var(--space-xl);
    background-color: var(--color-bg);
    overflow: hidden;
  }
  
  /* Modern Polka dot grid texture */
  .hero-bg-overlay {
    position: absolute;
    inset: 0;
    --distance: 1.5rem;
    --radius: 1px;
    --polka: radial-gradient(circle, var(--color-card-border) var(--radius), transparent calc(var(--radius) + 1px));
    background: var(--polka) 0 0, var(--polka) var(--distance) var(--distance) transparent;
    background-size: calc(var(--distance) * 2) calc(var(--distance) * 2);
    mask-image: radial-gradient(circle at center, black 40%, transparent 85%);
    -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 85%);
    pointer-events: none;
    z-index: 1;
  }

  .hero-container {
    position: relative;
    z-index: 2;
  }

  .hero-content {
    max-width: 800px;
    margin-inline: auto;
    text-align: center;
  }

  .hero-tagline {
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    display: inline-block;
    margin-bottom: var(--space-xs);
  }

  .hero-title {
    font-size: clamp(2.5rem, 2rem + 2.5vw, 4.5rem);
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
    line-height: 1.05;
  }

  .hero-lead {
    font-size: clamp(1.1rem, 1rem + 0.2vw, 1.3rem);
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
    text-wrap: pretty;
  }

  .hero-cta-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
  }

  .hero-socials {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    align-items: center;
  }

  .social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    font-weight: 600;
    transition: color var(--transition-fast);
  }

  .social-link:hover {
    color: var(--color-heading);
  }

  .social-link svg {
    width: 1.25rem;
    height: 1.25rem;
  }

  /* ==========================================
     About & Competencies Section
     ========================================== */
  
  .about-section {
    padding-block: var(--space-xl);
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-card-border);
  }

  .competencies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
  }

  .competency-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-card-border);
    border-radius: 20px;
    padding: var(--space-md);
    transition: transform var(--transition-bounce), border-color var(--transition-fast), box-shadow var(--transition-fast);
  }

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

  .competency-icon-wrapper {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
  }

  .competency-icon-wrapper svg {
    width: 1.5rem;
    height: 1.5rem;
  }

  /* Accent icon wrapper styles */
  .color-cyan { background-color: var(--color-accent-sec-light); color: var(--color-accent-sec); }
  .color-purple { background-color: var(--color-accent-light); color: var(--color-accent); }
  .color-orange { background-color: var(--color-accent-ter-light); color: var(--color-accent-ter); }

  .competency-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
    font-weight: 700;
  }

  .competency-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: var(--space-md);
  }

  .competency-list {
    border-top: 1px solid var(--color-card-border);
    padding-top: var(--space-sm);
  }

  .competency-list li {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-heading);
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.25rem;
  }

  .competency-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
  }

  /* ==========================================
     Professional Experience Section (Timeline)
     ========================================== */
  
  .experience-section {
    padding-block: var(--space-xl);
    background-color: var(--color-bg);
  }

  .timeline {
    position: relative;
    max-width: 900px;
    margin-inline: auto;
    padding-block: var(--space-md);
  }

  .timeline-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 31px;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-card-border) 80%);
  }

  .timeline-item {
    position: relative;
    padding-left: 70px;
    margin-bottom: var(--space-lg);
  }

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

  .timeline-marker {
    position: absolute;
    top: 24px;
    left: 22px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--color-bg);
    border: 3px solid var(--color-card-border);
    z-index: 2;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
  }

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

  .timeline-marker.color-current {
    border-color: var(--color-accent);
    background-color: var(--color-bg);
    box-shadow: 0 0 10px 0 var(--color-accent);
  }

  .timeline-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-card-border);
    border-radius: 20px;
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-bounce), border-color var(--transition-fast), box-shadow var(--transition-fast);
  }

  .timeline-item:hover .timeline-card {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
  }

  .timeline-header {
    margin-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-card-border);
    padding-bottom: var(--space-sm);
  }

  .timeline-date {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: 0.25rem;
  }

  .timeline-title {
    font-size: 1.35rem;
    margin-bottom: 0.25rem;
  }

  .timeline-company {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
  }

  .timeline-location {
    font-weight: 400;
    color: var(--color-text-muted);
    font-size: 0.9rem;
  }

  .timeline-body p {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
  }

  .timeline-body ul {
    list-style-type: none;
  }

  .timeline-body li {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.4rem;
  }

  .timeline-body li::before {
    content: "•";
    position: absolute;
    left: 0.25rem;
    color: var(--color-accent);
    font-weight: 700;
  }

  /* ==========================================
     Projects Showcase Section
     ========================================== */
  
  .projects-section {
    padding-block: var(--space-xl);
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-card-border);
    border-bottom: 1px solid var(--color-card-border);
  }

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

  .project-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-card-border);
    border-radius: 24px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform var(--transition-bounce), border-color var(--transition-fast), box-shadow var(--transition-fast);
  }

  .project-card:hover {
    transform: translateY(-6px);
    border-color: var(--project-color);
    box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.3), var(--shadow-glow);
  }

  .project-card-image-placeholder {
    height: 140px;
    background-color: var(--color-bg);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }

  .project-card-icon-main {
    position: relative;
    z-index: 2;
    color: var(--project-color);
    width: 3.5rem;
    height: 3.5rem;
    transition: transform var(--transition-bounce);
  }
  
  .project-card:hover .project-card-icon-main {
    transform: scale(1.15) rotate(5deg);
  }

  .card-bg-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, var(--project-color) 0%, transparent 70%);
    opacity: 0.12;
    transition: opacity var(--transition-fast);
  }
  
  .project-card:hover .card-bg-gradient {
    opacity: 0.2;
  }

  .project-card-content {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
  }

  .project-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
  }

  .project-badge {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--project-color);
  }

  .project-year {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    font-weight: 500;
  }

  .project-card-title {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
  }

  .project-card-description {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: var(--space-md);
    flex-grow: 1;
  }

  .project-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
  }

  .tech-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 8px;
    color: var(--color-text);
  }

  .btn-card-details {
    margin-top: auto;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: 12px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-card-border);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  }

  .btn-card-details svg {
    width: 1rem;
    height: 1rem;
    transition: transform var(--transition-fast);
  }

  .btn-card-details:hover {
    background-color: var(--project-color);
    border-color: var(--project-color);
    color: var(--color-accent-text);
    box-shadow: 0 4px 12px 0 rgba(0,0,0,0.1);
  }

  .btn-card-details:hover svg {
    transform: translateX(3px);
  }

  /* ==========================================
     Contact & Footer Sections
     ========================================== */
  
  .contact-section {
    padding-block: var(--space-xl);
    background-color: var(--color-bg);
  }

  .contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-lg);
    background-color: var(--color-surface);
    border: 1px solid var(--color-card-border);
    border-radius: 28px;
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
  }

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

  .contact-info-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--space-md);
  }

  .contact-details-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .contact-details-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .contact-details-list svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--color-accent);
    flex-shrink: 0;
  }

  .contact-details-list a {
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
  }

  .contact-details-list a:hover {
    color: var(--color-accent);
  }

  .contact-form-card form {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }

  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
  }

  .form-group input, .form-group textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-card-border);
    border-radius: 10px;
    background-color: var(--color-bg);
    color: var(--color-heading);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  }

  .form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
  }

  .btn-submit {
    align-self: flex-start;
    padding: 0.75rem 2rem;
  }

  .site-footer {
    padding-block: var(--space-md);
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-card-border);
  }

  .footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
  }

  .footer-copy {
    font-size: 0.9rem;
    color: var(--color-text-muted);
  }

  .footer-links {
    display: flex;
    gap: 1.5rem;
  }

  .footer-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
  }

  .footer-links a:hover {
    color: var(--color-heading);
  }

  /* ==========================================
     Native Popover/Dialog Styling
     ========================================== */
  
  .project-details-dialog {
    border: 1px solid var(--dialog-border);
    border-radius: 24px;
    background-color: var(--dialog-bg);
    color: var(--color-text);
    padding: 0;
    max-width: 800px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    margin: auto;
    
    /* Starting states for reveal transition */
    opacity: 0;
    transform: scale(0.95) translateY(15px);
    transition: 
      opacity 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), 
      transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), 
      display 0.35s allow-discrete, 
      overlay 0.35s allow-discrete;
  }

  .project-details-dialog[open] {
    opacity: 1;
    transform: scale(1) translateY(0);
  }

  /* Native starting-style block for entry animation trigger */
  @starting-style {
    .project-details-dialog[open] {
      opacity: 0;
      transform: scale(0.95) translateY(15px);
    }
  }

  .project-details-dialog::backdrop {
    background-color: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    transition: 
      background-color 0.35s ease-out, 
      backdrop-filter 0.35s ease-out,
      display 0.35s allow-discrete, 
      overlay 0.35s allow-discrete;
  }

  .project-details-dialog[open]::backdrop {
    background-color: var(--dialog-backdrop-bg);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
  }

  @starting-style {
    .project-details-dialog[open]::backdrop {
      background-color: rgba(0, 0, 0, 0);
      backdrop-filter: blur(0px);
      -webkit-backdrop-filter: blur(0px);
    }
  }

  .dialog-content-wrapper {
    position: relative;
    padding: var(--space-md) var(--space-md) var(--space-lg) var(--space-md);
    max-height: 85vh;
    overflow-y: auto;
  }

  .dialog-close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  }

  .dialog-close-btn:hover {
    background-color: var(--color-bg-alt);
    border-color: var(--color-accent);
    color: var(--color-accent);
  }

  .dialog-close-btn svg {
    width: 1.15rem;
    height: 1.15rem;
  }

  .dialog-header {
    margin-bottom: var(--space-md);
    padding-right: 3rem;
  }

  .dialog-subtitle-tag {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 0.25rem;
  }

  .dialog-main-title {
    font-size: clamp(1.5rem, 1.3rem + 1vw, 2.2rem);
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
  }

  .dialog-meta-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .meta-chip {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.2rem 0.75rem;
    background-color: var(--color-accent-light);
    border: 1px solid rgba(168, 85, 247, 0.1);
    border-radius: 20px;
    color: var(--color-accent);
  }

  /* Styled Tabs inside dialog */
  .dialog-tabs-container {
    border: 1px solid var(--color-card-border);
    border-radius: 16px;
    overflow: hidden;
    background-color: var(--color-bg-alt);
  }

  .dialog-tabs {
    display: flex;
    border-bottom: 1px solid var(--color-card-border);
    background-color: var(--color-bg);
    overflow-x: auto;
  }

  .tab-btn {
    flex-grow: 1;
    text-align: center;
    padding: 0.9rem var(--space-xs);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
    border-bottom: 2px solid transparent;
    min-width: 100px;
  }

  .tab-btn:hover {
    color: var(--color-heading);
    background-color: var(--dialog-tab-active);
  }

  .tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
    background-color: var(--color-bg-alt);
  }

  .tab-panels {
    padding: var(--space-md);
  }

  .tab-panel {
    display: none;
  }

  .tab-panel.active {
    display: block;
  }

  .panel-intro-lead {
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: var(--space-md);
    font-weight: 500;
    color: var(--color-heading);
  }

  .panel-two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
  }

  .panel-column h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .panel-column p {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--color-text-muted);
  }

  .panel-quote {
    border-left: 3px solid var(--color-accent);
    padding-left: 1rem;
    font-style: italic;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-block: var(--space-sm);
  }

  .features-list-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

  .feature-item-detail h5 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
  }

  .feature-item-detail p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
  }

  .panel-tech-breakdown {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }

  .tech-spec-list {
    background-color: var(--color-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    padding: var(--space-sm);
  }

  .spec-row {
    font-size: 0.9rem;
    padding-block: 0.5rem;
    border-bottom: 1px solid var(--color-card-border);
  }

  .spec-row:last-child {
    border-bottom: none;
  }

  .spec-row strong {
    color: var(--color-heading);
    display: inline-block;
    min-width: 100px;
  }

  .architecture-diagram-container h5, .business-model-card h5, .mcp-diagram-card h5 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
  }

  .architecture-box-layout {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    background-color: var(--color-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    padding: var(--space-sm);
    justify-content: center;
  }

  .arch-box {
    padding: 0.4rem 0.8rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-card-border);
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
  }
  
  .arch-box.highlight-purple {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: var(--color-accent-light);
  }
  
  .arch-box.highlight-orange {
    border-color: var(--color-accent-ter);
    color: var(--color-accent-ter);
    background-color: var(--color-accent-ter-light);
  }

  .arch-arrow {
    font-size: 1rem;
    color: var(--color-text-muted);
  }

  .business-model-card, .mcp-diagram-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    padding: var(--space-sm);
  }

  .business-model-card p, .mcp-diagram-card p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
  }

  .business-model-card ul {
    list-style-type: disc;
    padding-left: 1.25rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
  }
  
  .business-model-card li {
    margin-bottom: 0.3rem;
  }

  .screens-breakdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

  .screen-detail-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    padding: var(--space-sm);
  }

  .screen-detail-card h6 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    color: var(--color-accent);
  }

  .screen-detail-card p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.4;
  }

  .flow-steps-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }

  .flow-step {
    background-color: var(--color-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    padding: var(--space-sm);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1rem;
    align-items: center;
  }

  .step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--color-accent);
    color: var(--color-accent-text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
  }

  .flow-step h6 {
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
  }

  .flow-step p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    grid-column: 2;
  }
}

@layer utilities {
  /* ==========================================
     Responsive Media Queries and Utilities
     ========================================== */
  
  /* Scroll-driven reveals animation definition */
  @media (prefers-reduced-motion: no-preference) {
    @supports ((animation-timeline: view()) and (animation-range: entry)) {
      .scroll-reveal {
        animation: scroll-reveal-in auto linear both;
        animation-timeline: view();
        animation-range: entry 10% entry 40%;
      }
    }
  }

  @keyframes scroll-reveal-in {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Responsive styling breakpoints */
  @media (max-width: 768px) {
    .nav-list {
      display: none; /* Hide default nav list on mobile */
    }

    #main-header.menu-open .nav-list {
      display: flex;
      flex-direction: column;
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background-color: var(--color-surface);
      border-bottom: 1px solid var(--color-card-border);
      padding: var(--space-md);
      gap: 1.5rem;
      box-shadow: var(--shadow-lg);
      animation: menu-slide-in 0.3s ease-out;
    }

    @keyframes menu-slide-in {
      from { transform: translateY(-10px); opacity: 0; }
      to { transform: translateY(0); opacity: 1; }
    }

    .mobile-menu-btn {
      display: flex; /* Show menu toggle button on mobile */
    }

    /* Animate menu bars when open */
    #main-header.menu-open .menu-bar:nth-child(1) {
      transform: translateY(9px) rotate(45deg);
    }
    #main-header.menu-open .menu-bar:nth-child(2) {
      opacity: 0;
    }
    #main-header.menu-open .menu-bar:nth-child(3) {
      transform: translateY(-9px) rotate(-45deg);
    }

    .contact-wrapper {
      grid-template-columns: 1fr;
      padding: var(--space-md);
    }

    .form-row {
      grid-template-columns: 1fr;
    }

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

    .features-list-grid, .screens-breakdown-grid {
      grid-template-columns: 1fr;
    }

    .timeline-line {
      left: 17px;
    }
    .timeline-marker {
      left: 8px;
    }
    .timeline-item {
      padding-left: 45px;
    }
  }
}