/* =========================================================================
       SITE DESIGN SYSTEM — shared by every static document of adelajdo.dev.
       The tokens and shell components are extracted verbatim from the
       homepage document, so the homepage and the case-study pages remain one
       single visual system instead of drifting into two.
       Page-specific components live in case-study.css.
       ========================================================================= */

    /* ========== CSS RESET & BASE ========== */
    *, *::before, *::after {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      /* Colors - Dark Theme */
      --bg-primary: #0a0a0a;
      --bg-secondary: #111111;
      --bg-tertiary: #1a1a1a;
      --text-primary: #ffffff;
      --text-secondary: #a0a0a0;
      --text-tertiary: #666666;
      --accent: #00ff88;
      --accent-hover: #00cc6a;
      --accent-glow: rgba(0, 255, 136, 0.3);
      --border: #2a2a2a;
      --border-hover: #3a3a3a;
      
      /* Typography */
      --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
      
      /* Spacing */
      --space-xs: 0.5rem;
      --space-sm: 1rem;
      --space-md: 1.5rem;
      --space-lg: 2rem;
      --space-xl: 3rem;
      --space-2xl: 4rem;
      --space-3xl: 6rem;
      
      /* Transitions */
      --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
      --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
      --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
      
      /* Layout */
      --container-max: 1400px;
      --border-radius: 8px;
      --border-radius-lg: 16px;
    }

    [data-theme="light"] {
      --bg-primary: #fafafa;
      --bg-secondary: #ffffff;
      --bg-tertiary: #f0f0f0;
      --text-primary: #0a0a0a;
      --text-secondary: #555555;
      --text-tertiary: #888888;
      --accent: #0066ff;
      --accent-hover: #0052cc;
      --accent-glow: rgba(0, 102, 255, 0.2);
      --border: #e0e0e0;
      --border-hover: #cccccc;
    }

    /* ========== BASE STYLES ========== */
    html {
      scroll-behavior: smooth;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    body {
      font-family: var(--font-primary);
      background-color: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.6;
      overflow-x: hidden;
      transition: background-color var(--transition-base), color var(--transition-base);
      cursor: none;
    }

    @media (max-width: 768px) {
      body {
        cursor: auto;
      }
    }

    /* ========== CUSTOM CURSOR ========== */
    .cursor {
      position: fixed;
      width: 20px;
      height: 20px;
      border: 2px solid var(--accent);
      border-radius: 50%;
      pointer-events: none;
      z-index: 9999;
      transition: transform 0.2s ease, border-color 0.2s ease, width 0.2s ease, height 0.2s ease;
      transform: translate(-50%, -50%);
      mix-blend-mode: difference;
    }

    .cursor-follower {
      position: fixed;
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      pointer-events: none;
      z-index: 9998;
      transform: translate(-50%, -50%);
      transition: transform 0.1s ease;
    }

    .cursor.hover {
      width: 40px;
      height: 40px;
      border-width: 3px;
      background-color: var(--accent-glow);
    }

    @media (max-width: 768px) {
      .cursor, .cursor-follower {
        display: none;
      }
    }

    /* ========== TYPOGRAPHY ========== */
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }

    h1 { font-size: clamp(2.5rem, 8vw, 5rem); }
    h2 { font-size: clamp(2rem, 6vw, 3.5rem); }
    h3 { font-size: clamp(1.5rem, 4vw, 2rem); }
    h4 { font-size: clamp(1.25rem, 3vw, 1.5rem); }

    p {
      color: var(--text-secondary);
      line-height: 1.7;
    }

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

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

    /* ========== LAYOUT ========== */
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 var(--space-lg);
    }

    section {
      padding: var(--space-3xl) 0;
      position: relative;
    }

    /* ========== SKIP LINK ========== */
    .skip-link {
      position: absolute;
      top: -100px;
      left: 0;
      background: var(--accent);
      color: var(--bg-primary);
      padding: var(--space-sm) var(--space-md);
      z-index: 10000;
      font-weight: 600;
      transition: top var(--transition-base);
    }

    .skip-link:focus {
      top: 0;
    }

    /* ========== NAVIGATION ========== */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background-color: rgba(10, 10, 10, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
      transition: all var(--transition-base);
    }

    [data-theme="light"] .navbar {
      background-color: rgba(250, 250, 250, 0.8);
    }

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

    .nav-logo {
      font-weight: 800;
      font-size: 1.25rem;
      color: var(--text-primary);
      letter-spacing: -0.03em;
    }

    .nav-logo span {
      color: var(--accent);
    }

    .nav-menu {
      display: flex;
      gap: var(--space-lg);
      list-style: none;
      align-items: center;
    }

    .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.9rem;
      position: relative;
      padding: var(--space-xs) 0;
      transition: color var(--transition-fast);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent);
      transition: width var(--transition-base);
    }

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

    .nav-link:hover::after {
      width: 100%;
    }

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

    .nav-btn {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--text-secondary);
      padding: var(--space-xs) var(--space-sm);
      border-radius: var(--border-radius);
      cursor: pointer;
      font-size: 0.85rem;
      font-weight: 500;
      transition: all var(--transition-fast);
      font-family: var(--font-primary);
    }

    .nav-btn:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    .nav-btn.active {
      background-color: var(--accent);
      color: var(--bg-primary);
      border-color: var(--accent);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 4px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: var(--space-xs);
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background-color: var(--text-primary);
      transition: all var(--transition-fast);
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }

      .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        gap: var(--space-xl);
        transition: left var(--transition-base);
      }

      .nav-menu.active {
        left: 0;
      }

      .nav-link {
        font-size: 1.5rem;
      }
    }

    .btn {
      display: inline-flex;
      align-items: center;
      gap: var(--space-xs);
      padding: var(--space-md) var(--space-xl);
      border-radius: var(--border-radius);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all var(--transition-base);
      border: 2px solid transparent;
      position: relative;
      overflow: hidden;
    }

    .btn-primary {
      background-color: var(--accent);
      color: var(--bg-primary);
      border-color: var(--accent);
    }

    .btn-primary:hover {
      background-color: var(--accent-hover);
      border-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 10px 30px var(--accent-glow);
    }

    .btn-secondary {
      background-color: transparent;
      color: var(--text-primary);
      border-color: var(--border);
    }

    .btn-secondary:hover {
      border-color: var(--accent);
      color: var(--accent);
      transform: translateY(-2px);
    }

    .btn-arrow {
      transition: transform var(--transition-fast);
    }

    .btn:hover .btn-arrow {
      transform: translateX(4px);
    }

    /* ========== SECTION HEADERS ========== */
    .section-header {
      margin-bottom: var(--space-3xl);
    }

    .section-label {
      display: inline-flex;
      align-items: center;
      gap: var(--space-xs);
      font-family: var(--font-mono);
      font-size: 0.85rem;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 0.1em;
      margin-bottom: var(--space-sm);
    }

    .section-label::before {
      content: '//';
      opacity: 0.5;
    }

    .section-title {
      margin-bottom: var(--space-md);
    }

    .section-description {
      max-width: 600px;
      font-size: 1.1rem;
    }

    /* ========== FOOTER ========== */
    .footer {
      background-color: var(--bg-secondary);
      border-top: 1px solid var(--border);
      padding: var(--space-3xl) 0 var(--space-lg);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: var(--space-2xl);
      margin-bottom: var(--space-2xl);
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .footer-brand p {
      margin-top: var(--space-md);
      font-size: 0.95rem;
    }

    .footer-heading {
      font-size: 0.9rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      margin-bottom: var(--space-md);
      color: var(--text-primary);
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: var(--space-sm);
    }

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

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

    .footer-bottom {
      display: flex;
      justify-content: center;
      align-items: center;
      text-align: center;
      padding-top: var(--space-xl);
      border-top: 1px solid var(--border);
      font-size: 0.85rem;
      color: var(--text-tertiary);
    }

    .footer-social {
      display: flex;
      gap: var(--space-md);
    }

    .footer-social a {
      width: 40px;
      height: 40px;
      background-color: var(--bg-tertiary);
      border: 1px solid var(--border);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      transition: all var(--transition-fast);
    }

    .footer-social a:hover {
      background-color: var(--accent);
      color: var(--bg-primary);
      border-color: var(--accent);
      transform: translateY(-2px);
    }

    /* ========== COOKIE BANNER ========== */
    .cookie-banner {
      position: fixed;
      bottom: 20px;
      left: 20px;
      right: 20px;
      max-width: 500px;
      background-color: var(--bg-secondary);
      border: 1px solid var(--border);
      border-radius: var(--border-radius-lg);
      padding: var(--space-lg);
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
      z-index: 9999;
      display: none;
      animation: slideUp 0.5s ease-out;
    }

    .cookie-banner.show {
      display: block;
    }

    .cookie-banner h3 {
      font-size: 1.2rem;
      margin-bottom: var(--space-sm);
    }

    .cookie-banner p {
      font-size: 0.9rem;
      margin-bottom: var(--space-lg);
    }

    .cookie-buttons {
      display: flex;
      gap: var(--space-sm);
    }

    .cookie-btn {
      padding: var(--space-sm) var(--space-md);
      border-radius: var(--border-radius);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: all var(--transition-fast);
      border: 1px solid transparent;
      font-family: var(--font-primary);
    }

    .cookie-btn-accept {
      background-color: var(--accent);
      color: var(--bg-primary);
      border-color: var(--accent);
    }

    .cookie-btn-accept:hover {
      background-color: var(--accent-hover);
    }

    .cookie-btn-decline {
      background-color: transparent;
      color: var(--text-primary);
      border-color: var(--border);
    }

    .cookie-btn-decline:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    /* ========== MODAL ========== */
    .modal {
      position: fixed;
      inset: 0;
      background-color: rgba(0, 0, 0, 0.8);
      backdrop-filter: blur(10px);
      z-index: 10000;
      display: none;
      align-items: center;
      justify-content: center;
      padding: var(--space-lg);
    }

    .modal.show {
      display: flex;
    }

    .modal-content {
      background-color: var(--bg-secondary);
      border: 1px solid var(--border);
      border-radius: var(--border-radius-lg);
      padding: var(--space-2xl);
      max-width: 600px;
      width: 100%;
      max-height: 80vh;
      overflow-y: auto;
      position: relative;
    }

    .modal-close {
      position: absolute;
      top: var(--space-md);
      right: var(--space-md);
      background: transparent;
      border: none;
      color: var(--text-secondary);
      font-size: 1.5rem;
      cursor: pointer;
      transition: color var(--transition-fast);
    }

    .modal-close:hover {
      color: var(--accent);
    }

    /* ========== SCROLL PROGRESS ========== */
    .scroll-progress {
      position: fixed;
      top: 0;
      left: 0;
      width: 0%;
      height: 3px;
      background: linear-gradient(90deg, var(--accent), var(--accent-hover));
      z-index: 9999;
      transition: width 0.1s linear;
    }

    /* ========== UTILITIES ========== */
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    }

    .reveal.active {
      opacity: 1;
      transform: translateY(0);
    }

    .text-accent {
      color: var(--accent);
    }

    .font-mono {
      font-family: var(--font-mono);
    }

    .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;
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }

    /* ========== ACCESSIBILITY ========== */
    *:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    /* ========== PRINT ========== */
    @media print {
      .navbar, .cookie-banner, .cursor, .cursor-follower, .scroll-indicator {
        display: none !important;
      }
      
      body {
        background: white;
        color: black;
      }
    }