/* ==========================================================================
   DESIGN SYSTEM - TOKENS
   ========================================================================== */

@layer reset, base, theme, layout, components, utilities;

@layer reset {
  /* Box sizing and margin resets */
  *, *::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: 1.6;
    -webkit-font-smoothing: antialiased;
  }

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

  input, button, textarea, select {
    font: inherit;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}

@layer base {
  :root {
    color-scheme: light dark;

    /* Lithic/Core Tokens (Tier 1) */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    
    /* Light Mode Tokens (Default) */
    --light-bg-base: hsl(220, 30%, 98%);
    --light-bg-surface: hsla(220, 30%, 100%, 0.7);
    --light-bg-glass: hsla(220, 30%, 100%, 0.4);
    --light-text-primary: hsl(220, 40%, 10%);
    --light-text-secondary: hsl(220, 15%, 35%);
    --light-text-muted: hsl(220, 10%, 50%);
    --light-border: hsla(220, 20%, 10%, 0.08);
    --light-border-hover: hsla(220, 20%, 10%, 0.15);
    --light-accent: hsl(224, 76%, 48%); /* Premium Royal Blue */
    --light-accent-glow: hsla(224, 76%, 48%, 0.15);
    --light-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.04);
    --light-glow-1: hsla(210, 100%, 80%, 0.2);
    --light-glow-2: hsla(260, 100%, 80%, 0.15);

    /* Dark Mode Tokens */
    --dark-bg-base: hsl(222, 47%, 4%);
    --dark-bg-surface: hsla(222, 47%, 8%, 0.75);
    --dark-bg-glass: hsla(222, 47%, 8%, 0.45);
    --dark-text-primary: hsl(210, 40%, 98%);
    --dark-text-secondary: hsl(215, 20%, 75%);
    --dark-text-muted: hsl(215, 12%, 50%);
    --dark-border: hsla(210, 30%, 90%, 0.06);
    --dark-border-hover: hsla(210, 30%, 90%, 0.12);
    --dark-accent: hsl(210, 100%, 65%); /* Neon Ice Blue */
    --dark-accent-glow: hsla(210, 100%, 65%, 0.2);
    --dark-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --dark-glow-1: hsla(210, 80%, 50%, 0.15);
    --dark-glow-2: hsla(280, 80%, 50%, 0.1);

    /* Semantic Mappings (Tier 2) using light-dark() */
    --bg-base: light-dark(var(--light-bg-base), var(--dark-bg-base));
    --bg-surface: light-dark(var(--light-bg-surface), var(--dark-bg-surface));
    --bg-glass: light-dark(var(--light-bg-glass), var(--dark-bg-glass));
    --text-primary: light-dark(var(--light-text-primary), var(--dark-text-primary));
    --text-secondary: light-dark(var(--light-text-secondary), var(--dark-text-secondary));
    --text-muted: light-dark(var(--light-text-muted), var(--dark-text-muted));
    --border-color: light-dark(var(--light-border), var(--dark-border));
    --border-hover: light-dark(var(--light-border-hover), var(--dark-border-hover));
    --color-accent: light-dark(var(--light-accent), var(--dark-accent));
    --color-accent-glow: light-dark(var(--light-accent-glow), var(--dark-accent-glow));
    --shadow-main: light-dark(var(--light-shadow), var(--dark-shadow));
    --glow-orb-1-color: light-dark(var(--light-glow-1), var(--dark-glow-1));
    --glow-orb-2-color: light-dark(var(--light-glow-2), var(--dark-glow-2));

    /* Layout Tokens */
    --container-max-width: 1200px;
    --section-spacing: clamp(4rem, 8vw, 8rem);
  }

  body {
    font-family: var(--font-sans);
    background-color: var(--bg-base);
    color: var(--text-primary);
    overflow-x: hidden;
    transition: background-color 0.5s ease, color 0.3s ease;
  }

  /* Custom Premium Scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--color-accent) var(--bg-base);

  ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
  }

  ::-webkit-scrollbar-track {
    background: var(--bg-base);
  }

  ::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
    border: 2px solid var(--bg-base);
  }

  ::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
  }

  /* Focus rings outline rules */
  :focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
  }

  h1, h2, h3 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.15;
    text-wrap: balance; /* Prevent single hanging words in headlines */
  }

  p {
    text-wrap: pretty; /* Prevent orphans in paragraphs */
  }
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */

@layer layout {
  .glow-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
  }

  .glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.8;
    mix-blend-mode: screen;
  }

  .glow-orb-1 {
    top: -10%;
    right: 10%;
    width: clamp(300px, 40vw, 600px);
    height: clamp(300px, 40vw, 600px);
    background-color: var(--glow-orb-1-color);
  }

  .glow-orb-2 {
    bottom: -10%;
    left: 10%;
    width: clamp(250px, 35vw, 500px);
    height: clamp(250px, 35vw, 500px);
    background-color: var(--glow-orb-2-color);
  }

  .header-container,
  .hero-container,
  .info-container,
  .legal-container,
  .contact-container,
  .footer-container {
    width: 90%;
    max-width: var(--container-max-width);
    margin-inline: auto;
  }
}

/* ==========================================================================
   COMPONENTS
   ========================================================================== */

@layer components {
  /* Site Header */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: hsla(from var(--bg-base) h s l / 0.7);
    border-bottom: 1px solid var(--border-color);
    padding-block: 1rem;
    transition: background-color 0.5s ease;
  }

  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    display: flex;
    align-items: center;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: 0.1em;
  }

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

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

  .logo-mark {
    height: 34px;
    width: auto;
    margin-inline-end: 0.65rem;
    display: block;
  }

  /* Mark is black artwork on transparent bg: invert to white in dark mode */
  @media (prefers-color-scheme: dark) {
    .logo-mark { filter: invert(1); }
  }
  html[style*="color-scheme: light"] .logo-mark { filter: none; }
  html[style*="color-scheme: dark"] .logo-mark { filter: invert(1); }

  .main-nav {
    display: none; /* Hide on mobile by default */
  }

  @media (min-width: 768px) {
    .main-nav {
      display: block;
    }
  }

  .nav-list {
    display: flex;
    list-style: none;
    gap: 2.5rem;
  }

  .nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.25s ease;
  }

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

  /* Theme Button Toggle */
  .theme-btn {
    background: none;
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: background-color 0.25s, border-color 0.25s;
  }

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

  /* Display icon according to HTML [color-scheme] */
  :root[style*="color-scheme: light"] .moon-icon,
  :root:not([style*="color-scheme"]) .moon-icon {
    display: block;
  }
  :root[style*="color-scheme: light"] .sun-icon,
  :root:not([style*="color-scheme"]) .sun-icon {
    display: none;
  }

  :root[style*="color-scheme: dark"] .sun-icon {
    display: block;
  }
  :root[style*="color-scheme: dark"] .moon-icon {
    display: none;
  }

  /* When system scheme is dark and style is not forced light */
  @media (prefers-color-scheme: dark) {
    :root:not([style*="color-scheme: light"]) .sun-icon {
      display: block;
    }
    :root:not([style*="color-scheme: light"]) .moon-icon {
      display: none;
    }
  }

  /* Glass Panel Styling */
  .glass-panel {
    background-color: var(--bg-glass);
    backdrop-filter: blur(16px) saturate(120%);
    -webkit-backdrop-filter: blur(16px) saturate(120%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-main);
  }

  /* Hero Section */
  .hero-section {
    padding-block: calc(var(--section-spacing) * 1.5) var(--section-spacing);
    text-align: center;
  }

  .hero-eyebrow {
    font-family: var(--font-sans);
    text-transform: uppercase;
    letter-spacing: 0.22em;
    font-size: clamp(0.7rem, 0.4vw + 0.65rem, 0.85rem);
    font-weight: 500;
    color: var(--color-accent);
    margin-block-end: 1.25rem;
  }

  .hero-headline {
    font-size: clamp(2.5rem, 5vw + 1rem, 5rem);
    margin-block-end: 1.5rem;
    letter-spacing: -0.02em;
  }

  .highlight-text {
    background: linear-gradient(135deg, var(--color-accent) 0%, hsl(260, 100%, 65%) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-subheading {
    font-size: clamp(1rem, 1.2vw + 0.8rem, 1.25rem);
    color: var(--text-secondary);
    max-width: 750px;
    margin-inline: auto;
    margin-block-end: 3rem;
  }

  .hero-cta-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }

  /* Buttons */
  .cta-primary {
    background-color: var(--color-accent);
    color: #fff;
    padding: 0.8rem 1.8rem;
    border-radius: 8px;
    font-weight: 500;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .cta-primary:hover {
    transform: translateY(-2px);
    opacity: 0.95;
  }

  .cta-secondary {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.8rem 1.8rem;
    border-radius: 8px;
    font-weight: 500;
    transition: transform 0.2s ease, background-color 0.2s ease;
  }

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

  /* Info Section */
  .info-section {
    padding-block: var(--section-spacing);
  }

  .section-header {
    text-align: center;
    margin-block-end: 4rem;
  }

  .section-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    margin-block-end: 1rem;
  }

  .section-subtitle {
    color: var(--text-secondary);
    max-width: 600px;
    margin-inline: auto;
  }

  .grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
  }

  .card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--shadow-main);
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), border-color 0.3s ease;
  }

  .card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
  }

  .card-icon {
    font-size: 2rem;
    color: var(--color-accent);
    margin-block-end: 1.5rem;
  }

  .card-title {
    font-size: 1.25rem;
    margin-block-end: 0.8rem;
  }

  .card-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
  }

  /* Legal Section */
  .legal-section {
    padding-block: var(--section-spacing);
  }

  .legal-container {
    padding: 3rem;
  }

  .legal-intro {
    color: var(--text-secondary);
    margin-block-end: 2.5rem;
  }

  .legal-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

  .legal-item {
    border-bottom: 1px solid var(--border-color);
    padding-block-end: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .legal-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
  }

  .legal-value {
    font-size: 1.05rem;
    font-weight: 500;
  }

  /* Contact Section */
  .contact-section {
    padding-block: var(--section-spacing) calc(var(--section-spacing) * 1.5);
  }

  .contact-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
  }

  @media (min-width: 992px) {
    .contact-container {
      grid-template-columns: 2fr 3fr;
    }
  }

  .contact-info-block {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .contact-intro {
    color: var(--text-secondary);
    margin-block: 1rem 2.5rem;
  }

  .contact-methods {
    display: grid;
    gap: 1.5rem;
  }

  .method-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
  }

  .method-icon {
    font-size: 1.5rem;
    width: 48px;
    height: 48px;
    background-color: var(--color-accent-glow);
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: var(--color-accent);
  }

  .method-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
  }

  .method-link {
    font-weight: 500;
    font-size: 1.1rem;
    transition: color 0.25s ease;
  }

  .method-link:hover {
    color: var(--color-accent);
  }

  /* Forms & Validation States */
  .contact-form-block {
    padding: 3rem;
  }

  .form-group {
    display: flex;
    flex-direction: column;
    margin-block-end: 1.8rem;
    position: relative;
  }

  .form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    margin-block-end: 0.6rem;
    color: var(--text-secondary);
  }

  .form-group input,
  .form-group textarea {
    padding: 0.8rem 1rem;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
    font-size: 1rem;
    min-height: 48px;
  }

  .form-group textarea {
    resize: vertical;
    min-height: 120px;
  }

  .form-group input:focus,
  .form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 4px var(--color-accent-glow);
  }

  /* Invalid Validation styling utilizing :user-invalid */
  .form-group input:user-invalid,
  .form-group textarea:user-invalid {
    border-color: hsl(0, 75%, 60%);
    box-shadow: 0 0 0 4px hsla(0, 75%, 60%, 0.15);
  }

  .error-message {
    font-size: 0.8rem;
    color: hsl(0, 75%, 60%);
    margin-block-start: 0.4rem;
    display: none;
  }

  /* Submit Button styling */
  .submit-btn-primary {
    background-color: var(--color-accent);
    color: #fff;
    font-weight: 500;
    padding: 0.9rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease, background-color 0.2s ease;
    display: block;
    width: 100%;
    min-height: 48px;
  }

  .submit-btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    opacity: 0.95;
  }

  .submit-btn-primary:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
  }

  .form-status {
    margin-block-start: 1rem;
    text-align: center;
    font-size: 0.95rem;
    font-weight: 500;
  }

  .form-status.success {
    color: hsl(140, 70%, 45%);
  }

  .form-status.error {
    color: hsl(0, 75%, 60%);
  }

  /* Site Footer */
  .site-footer {
    border-top: 1px solid var(--border-color);
    padding-block: 4rem;
    background-color: var(--bg-surface);
    font-size: 0.9rem;
    color: var(--text-secondary);
  }

  .footer-container {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
  }

  @media (min-width: 768px) {
    .footer-container {
      flex-direction: row;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
    }
  }

  .footer-brand {
    max-width: 300px;
  }

  .footer-tagline {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-block-start: 0.5rem;
  }

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

  .footer-nav a:hover,
  .footer-nav button:hover {
    color: var(--color-accent);
  }

  .text-btn {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
  }

  .footer-copy {
    width: 100%;
    border-top: 1px solid var(--border-color);
    padding-block-start: 2rem;
    font-size: 0.8rem;
    color: var(--text-muted);
  }

  /* Native Dialog Modal Styling */
  .privacy-modal {
    margin: auto;
    width: 90%;
    max-width: 600px;
    padding: 0;
    overflow: hidden;
    color: var(--text-primary);
  }

  /* Allow backdrop dimming animate */
  .privacy-modal::backdrop {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    transition: opacity 0.3s ease;
  }

  .modal-content {
    display: flex;
    flex-direction: column;
    max-height: 80vh;
  }

  .modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
  }

  .modal-title {
    font-size: 1.5rem;
    font-family: var(--font-serif);
  }

  .close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s ease;
    padding: 0.5rem;
  }

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

  .modal-body {
    padding: 2rem;
    overflow-y: auto;
    font-size: 0.95rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
  }

  .modal-body h3 {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    margin-block-start: 0.5rem;
  }
}

/* ==========================================================================
   UTILITIES & ANIMATION SUPPORT
   ========================================================================== */

@layer utilities {
  .visually-hidden {
    position: absolute;
    clip-path: inset(50%);
    overflow: hidden;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    border: 0;
    white-space: nowrap;
  }
}