@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

/* Layer definitions for CSS organization */
@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 {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

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

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

@layer base {
  :root {
    /* Base Color Tokens */
    --color-primary: #D56312;
    --color-primary-hover: #b8520c;
    --color-primary-rgb: 213, 99, 18;
    
    --bg-light: #F9F9F9;
    --bg-dark: #0A0A0C;
    
    --card-light: #FFFFFF;
    --card-dark: #121216;
    
    --text-light: #1C1C1E;
    --text-dark: #F5F5F7;
    
    --text-muted-light: #6E6E73;
    --text-muted-dark: #8E8E93;
    
    --border-light: rgba(0, 0, 0, 0.06);
    --border-dark: rgba(255, 255, 255, 0.08);

    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Layout Tokens */
    --header-height: 72px;
    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 8px;
    
    /* Animation Timings */
    --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);
    
    /* Theme Mode */
    color-scheme: light dark;
  }

  body {
    background-color: var(--bg-light);
    color: var(--text-light);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
  }

  /* Dark mode theme overrides */
  body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-dark);
  }

  /* Focus rings outline */
  button:focus-visible,
  a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
  }

  /* Scrollbar Customization */
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }

  ::-webkit-scrollbar-track {
    background: transparent;
  }

  ::-webkit-scrollbar-thumb {
    background: rgba(var(--color-primary-rgb), 0.2);
    border-radius: 10px;
    border: 3px solid transparent;
    background-clip: content-box;
  }

  ::-webkit-scrollbar-thumb:hover {
    background: rgba(var(--color-primary-rgb), 0.6);
    border-radius: 10px;
    border: 3px solid transparent;
    background-clip: content-box;
  }

  /* Text Wrapping styles for balance & readability */
  h1, h2, h3 {
    text-wrap: balance;
    font-weight: 700;
  }

  p {
    text-wrap: pretty;
    margin-bottom: 1.25rem;
  }
}

@layer theme {
  /* Dynamic Background Blobs for Visual Aesthetics */
  .glow-orb {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--color-primary-rgb), 0.08) 0%, rgba(var(--color-primary-rgb), 0) 70%);
    z-index: -1;
    pointer-events: none;
    filter: blur(40px);
    animation: floatOrb 20s infinite alternate ease-in-out;
  }

  .glow-orb-1 {
    top: -100px;
    right: -100px;
  }

  .glow-orb-2 {
    bottom: 20%;
    left: -150px;
    background: radial-gradient(circle, rgba(var(--color-primary-rgb), 0.06) 0%, rgba(var(--color-primary-rgb), 0) 70%);
    animation-delay: -5s;
  }

  @keyframes floatOrb {
    0% {
      transform: translate(0, 0) scale(1);
    }
    100% {
      transform: translate(50px, 30px) scale(1.1);
    }
  }
}

@layer components {
  /* Navigation Bar (Glassmorphism) */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: background var(--transition-normal), border var(--transition-normal);
  }

  body.dark-mode .navbar {
    background: rgba(10, 10, 12, 0.75);
    border-bottom: 1px solid var(--border-dark);
  }

  .nav-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.5px;
  }

  .logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.15);
  }

  .logo-text {
    background: linear-gradient(to right, var(--color-primary), #FF8533);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
  }

  body.dark-mode .logo-text {
    background: linear-gradient(to right, #FF8533, #FFA366);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  /* Reading Progress Bar */
  .progress-container {
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 100%;
    height: 3px;
    background: transparent;
  }

  .progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, var(--color-primary), #FF8533);
    transition: width 0.1s ease-out;
  }

  /* Theme Toggle Switch */
  .theme-toggle-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(var(--color-primary-rgb), 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
    position: relative;
    overflow: hidden;
  }

  .theme-toggle-btn:hover {
    background: rgba(var(--color-primary-rgb), 0.15);
    transform: scale(1.05);
  }

  .theme-toggle-btn:active {
    transform: scale(0.95);
  }

  .theme-toggle-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--color-primary);
    position: absolute;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  /* Hide moon by default in light mode */
  .theme-toggle-btn .icon-moon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
  }

  /* When dark mode is active */
  body.dark-mode .theme-toggle-btn .icon-sun {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
  }

  body.dark-mode .theme-toggle-btn .icon-moon {
    opacity: 1;
    transform: rotate(0) scale(1);
    fill: #FFA366;
  }

  /* Page Layout */
  .main-wrapper {
    max-width: 1200px;
    margin: calc(var(--header-height) + 2.5rem) auto 4rem;
    padding: 0 1.5rem;
    position: relative;
  }

  /* Hero Section */
  .hero-card {
    background: var(--card-light);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-light);
    padding: 3rem 2rem;
    margin-bottom: 2.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.02);
    transition: background-color var(--transition-normal), border var(--transition-normal), box-shadow var(--transition-normal);
  }

  body.dark-mode .hero-card {
    background: var(--card-dark);
    border: 1px solid var(--border-dark);
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  }

  .hero-tag {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
  }

  body.dark-mode .hero-tag {
    background: rgba(var(--color-primary-rgb), 0.15);
    color: #FF8533;
  }

  .hero-card h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -1px;
  }

  .hero-meta {
    font-size: 0.95rem;
    color: var(--text-muted-light);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
  }

  body.dark-mode .hero-meta {
    color: var(--text-muted-dark);
  }

  /* Flex/Grid Columns */
  .layout-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: start;
  }

  @media (min-width: 992px) {
    .layout-container {
      grid-template-columns: 280px 1fr;
    }
  }

  /* Table of Contents (TOC) - Sidebar */
  .toc-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 1.5rem);
    background: var(--card-light);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-light);
    padding: 1.5rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.01);
    display: none; /* Shown on desktop only */
    transition: background-color var(--transition-normal), border var(--transition-normal);
  }

  body.dark-mode .toc-sidebar {
    background: var(--card-dark);
    border: 1px solid var(--border-dark);
  }

  @media (min-width: 992px) {
    .toc-sidebar {
      display: block;
    }
  }

  .toc-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted-light);
    margin-bottom: 1rem;
    font-weight: 700;
  }

  body.dark-mode .toc-title {
    color: var(--text-muted-dark);
  }

  .toc-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .toc-link {
    display: block;
    padding: 0.6rem 0.8rem;
    border-radius: var(--border-radius-sm);
    color: var(--text-muted-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast), background var(--transition-fast), padding-left var(--transition-fast);
  }

  body.dark-mode .toc-link {
    color: var(--text-muted-dark);
  }

  .toc-link:hover {
    color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.05);
    padding-left: 1.1rem;
  }

  .toc-link.active {
    color: #FFFFFF;
    background: var(--color-primary);
    box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.25);
  }

  /* Mobile Top Horizontal Scroll navigation */
  .mobile-toc {
    background: var(--card-light);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-md);
    padding: 0.75rem;
    margin-bottom: 1.5rem;
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    position: sticky;
    top: var(--header-height);
    z-index: 900;
    box-shadow: 0 4px 15px rgba(0,0,0,0.02);
    -webkit-overflow-scrolling: touch;
    transition: background-color var(--transition-normal), border var(--transition-normal);
  }

  body.dark-mode .mobile-toc {
    background: var(--card-dark);
    border: 1px solid var(--border-dark);
  }

  @media (min-width: 992px) {
    .mobile-toc {
      display: none;
    }
  }

  .mobile-toc::-webkit-scrollbar {
    display: none; /* Hide scrollbars for cleaner touch UI */
  }

  .mobile-toc-list {
    list-style: none;
    display: flex;
    gap: 0.5rem;
  }

  .mobile-toc-link {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    color: var(--text-muted-light);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
  }

  body.dark-mode .mobile-toc-link {
    color: var(--text-muted-dark);
  }

  .mobile-toc-link:hover {
    background: rgba(var(--color-primary-rgb), 0.05);
    color: var(--color-primary);
  }

  .mobile-toc-link.active {
    background: var(--color-primary);
    color: #FFFFFF;
  }

  /* Content Section Cards */
  .content-area {
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

  .content-section {
    background: var(--card-light);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-light);
    padding: 2.5rem;
    scroll-margin-top: calc(var(--header-height) + 1.5rem);
    box-shadow: 0 4px 20px rgba(0,0,0,0.01);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow), background-color var(--transition-normal), border var(--transition-normal);
  }

  @media (max-width: 991px) {
    .content-section {
      scroll-margin-top: calc(var(--header-height) + 4.5rem);
    }
  }

  .content-section.revealed {
    opacity: 1;
    transform: translateY(0);
  }

  body.dark-mode .content-section {
    background: var(--card-dark);
    border: 1px solid var(--border-dark);
    box-shadow: 0 4px 30px rgba(0,0,0,0.15);
  }

  /* Highlight glow animation on section direct target */
  .content-section:target {
    animation: targetGlow 1.5s ease-out;
  }

  @keyframes targetGlow {
    0% {
      border-color: rgba(var(--color-primary-rgb), 0.5);
      box-shadow: 0 0 25px rgba(var(--color-primary-rgb), 0.2);
    }
    100% {
      border-color: var(--border-light);
    }
  }

  body.dark-mode .content-section:target {
    animation: targetGlowDark 1.5s ease-out;
  }

  @keyframes targetGlowDark {
    0% {
      border-color: rgba(var(--color-primary-rgb), 0.7);
      box-shadow: 0 0 30px rgba(var(--color-primary-rgb), 0.35);
    }
    100% {
      border-color: var(--border-dark);
    }
  }

  .section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }

  .section-icon {
    width: 44px;
    height: 44px;
    background: rgba(var(--color-primary-rgb), 0.08);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  body.dark-mode .section-icon {
    background: rgba(var(--color-primary-rgb), 0.15);
  }

  .section-icon svg {
    width: 22px;
    height: 22px;
    fill: var(--color-primary);
  }

  body.dark-mode .section-icon svg {
    fill: #FF8533;
  }

  .content-section h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-light);
    letter-spacing: -0.5px;
  }

  body.dark-mode .content-section h2 {
    color: var(--text-dark);
  }

  .content-section p {
    color: var(--text-muted-light);
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
  }

  body.dark-mode .content-section p {
    color: var(--text-muted-dark);
  }

  /* Grid Layout for Internal Cards (e.g. Permissions) */
  .grid-2col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin-top: 1.5rem;
  }

  @media (min-width: 768px) {
    .grid-2col {
      grid-template-columns: 1fr 1fr;
    }
  }

  .info-card {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    transition: all var(--transition-normal);
  }

  body.dark-mode .info-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-dark);
  }

  .info-card:hover {
    border-color: rgba(var(--color-primary-rgb), 0.3);
    background: rgba(var(--color-primary-rgb), 0.01);
    transform: translateY(-2px);
  }

  .info-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
  }

  .info-card-icon {
    width: 28px;
    height: 28px;
    background: rgba(var(--color-primary-rgb), 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .info-card-icon svg {
    width: 14px;
    height: 14px;
    fill: var(--color-primary);
  }

  body.dark-mode .info-card-icon svg {
    fill: #FF8533;
  }

  .info-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
  }

  .info-card p {
    font-size: 0.95rem;
    margin-bottom: 0;
    line-height: 1.5;
  }

  /* Highlight Boxes for Third Party Services */
  .service-card {
    border-left: 4px solid var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.02);
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: background var(--transition-fast);
  }

  body.dark-mode .service-card {
    background: rgba(var(--color-primary-rgb), 0.04);
  }

  .service-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
  }

  .service-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    background: var(--color-primary);
    color: #FFFFFF;
    text-transform: uppercase;
  }

  .service-card-title {
    font-size: 1.15rem;
    font-weight: 600;
  }

  .service-card p {
    font-size: 0.98rem;
    margin-bottom: 0.75rem;
  }

  .service-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
  }

  /* Link & Button styling */
  .btn-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    padding: 0.4rem 0.8rem;
    border: 1px solid rgba(var(--color-primary-rgb), 0.25);
    border-radius: 6px;
    background: transparent;
    transition: all var(--transition-fast);
    cursor: pointer;
  }

  body.dark-mode .btn-link {
    color: #FF8533;
    border: 1px solid rgba(var(--color-primary-rgb), 0.4);
  }

  .btn-link:hover {
    background: var(--color-primary);
    color: #FFFFFF !important;
    border-color: var(--color-primary);
    box-shadow: 0 4px 8px rgba(var(--color-primary-rgb), 0.2);
  }

  .btn-link svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
  }

  .btn-inline-link {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px dashed var(--color-primary);
    font-weight: 500;
    transition: color var(--transition-fast), border-color var(--transition-fast);
  }

  .btn-inline-link:hover {
    color: var(--color-primary-hover);
    border-bottom-style: solid;
  }

  /* Footer Styling */
  .footer {
    border-top: 1px solid var(--border-light);
    background: var(--card-light);
    padding: 2.5rem 0;
    transition: background-color var(--transition-normal), border var(--transition-normal);
  }

  body.dark-mode .footer {
    background: var(--card-dark);
    border-top: 1px solid var(--border-dark);
  }

  .footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted-light);
  }

  body.dark-mode .footer-container {
    color: var(--text-muted-dark);
  }

  @media (min-width: 768px) {
    .footer-container {
      flex-direction: row;
    }
  }

  .footer-copyright {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .footer-logo-small {
    width: 20px;
    height: 20px;
    object-fit: contain;
  }

  .footer-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
  }

  .footer-links a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
  }

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

  /* Scroll to Top Button */
  .scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 4px 15px rgba(var(--color-primary-rgb), 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 950;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.9);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast), background-color var(--transition-fast);
  }

  .scroll-top-btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px) scale(1.05);
  }

  .scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

  .scroll-top-btn svg {
    width: 24px;
    height: 24px;
    fill: #FFFFFF;
  }
}

@layer utilities {
  .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}