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

/* ============================================
   RESET
   ============================================ */
@layer reset {
  *,
  *::before,
  *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
  }

  body {
    min-height: 100vh;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

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

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

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

  ul,
  ol {
    list-style: none;
  }
}

/* ============================================
   BASE — Design Tokens & Typography
   ============================================ */
@layer base {
  :root {
    /* Colors */
    --bg-base: #080808;
    --bg-surface: #111111;
    --bg-elevated: #1a1a1a;
    --text-primary: #f0f0f0;
    --text-secondary: #808080;
    --accent: #00e5a0;
    --accent-dim: oklch(0.75 0.18 165 / 0.08);
    --border: #1e1e1e;
    --border-hover: #333333;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
  }

  body {
    font-family: "Inter", system-ui, -apple-system, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-base);
  }

  /* Grain texture overlay */
  body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
  }

  h1,
  h2,
  h3 {
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -0.02em;
  }

  h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
  }

  h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  }

  h3 {
    font-size: 1.25rem;
  }
}

/* ============================================
   LAYOUT
   ============================================ */
@layer layout {
  .container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: var(--space-md);
  }

  .section {
    padding-block: clamp(3rem, 8vw, 6rem);
  }

  .grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);

    @media (min-width: 768px) {
      grid-template-columns: repeat(2, 1fr);
      gap: var(--space-lg);
    }
  }

  .grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);

    @media (min-width: 768px) {
      grid-template-columns: repeat(3, 1fr);
      gap: var(--space-lg);
    }
  }
}

/* ============================================
   COMPONENTS
   ============================================ */
@layer components {
  /* --- Header --- */
  .header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding-block: var(--space-sm);
    background: oklch(0.03 0 0 / 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }

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

  .header__logo {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--text-primary);
  }

  .header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
  }

  .header__link {
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);

    &:hover {
      color: var(--text-primary);
    }
  }

  /* --- Hero --- */
  .hero {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
    padding-block: clamp(4rem, 12vw, 8rem) clamp(3rem, 8vw, 6rem);
  }

  .hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.5;
  }

  .hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
  }

  /* --- Buttons --- */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--bg-base);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);

    &:hover {
      background: oklch(0.82 0.18 165);
      transform: translateY(-1px);
    }

    &:active {
      transform: translateY(0);
    }
  }

  .btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast);

    &:hover {
      border-color: var(--text-secondary);
      background: var(--bg-elevated);
    }
  }

  /* --- Section Header --- */
  .section__header {
    margin-bottom: var(--space-xl);
  }

  .section__label {
    display: inline-block;
    font-family: "JetBrains Mono", monospace;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
  }

  .section__description {
    color: var(--text-secondary);
    max-width: 560px;
    margin-top: var(--space-sm);
  }

  /* --- Product Card --- */
  .product-card {
    padding: var(--space-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-base), transform var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);

    &:hover {
      border-color: var(--border-hover);
      transform: translateY(-2px);
    }
  }

  .product-card__name {
    font-size: 1.5rem;
  }

  .product-card__desc {
    color: var(--text-secondary);
    line-height: 1.6;
  }

  .product-card__features {
    margin-top: var(--space-xs);
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
  }

  .product-card__feature {
    font-size: 0.875rem;
    color: var(--text-secondary);

    &::before {
      content: "\2192\00a0";
      color: var(--accent);
    }
  }

  .product-card__footer {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: auto;
    padding-top: var(--space-sm);
  }

  /* --- Badge --- */
  .badge {
    display: inline-block;
    font-family: "JetBrains Mono", monospace;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    background: var(--accent-dim);
    color: var(--accent);
  }

  .badge--dev {
    background: oklch(0.65 0.12 80 / 0.1);
    color: oklch(0.8 0.12 80);
  }

  .badge--research {
    background: oklch(0.75 0.12 60 / 0.1);
    color: oklch(0.85 0.12 60);
  }

  /* --- Steps --- */
  .steps {
    counter-reset: step;
  }

  .step-card {
    counter-increment: step;
    padding: var(--space-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
  }

  .step-card__number {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.8125rem;
    color: var(--accent);
    margin-bottom: var(--space-sm);

    &::before {
      content: "0" counter(step);
    }
  }

  .step-card__title {
    margin-bottom: 0.5rem;
  }

  .step-card__desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
  }

  /* --- Service Card --- */
  .service-card {
    padding: var(--space-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
  }

  .service-card__title {
    margin-bottom: 0.5rem;
  }

  .service-card__desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
  }

  /* --- Contact --- */
  .contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    align-items: start;

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

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

  .contact__text {
    color: var(--text-secondary);
    line-height: 1.6;
  }

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

  .contact-form input,
  .contact-form select,
  .contact-form textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);

    &::placeholder {
      color: var(--text-secondary);
    }

    &:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-dim);
    }
  }

  .contact-form select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%23808080' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
    cursor: pointer;
  }

  .contact-form select option {
    background: var(--bg-surface);
    color: var(--text-primary);
  }

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

  .contact-form .btn-primary {
    align-self: flex-start;
  }

  /* Honeypot — visually hidden but accessible to bots */
  .contact-form__hp {
    position: absolute;
    left: -9999px;
    opacity: 0;
    height: 0;
    width: 0;
    overflow: hidden;
    tab-index: -1;
  }


  /* --- Cookie Consent --- */
  .cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem var(--space-md);
    background: oklch(0.12 0 0 / 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
  }

  .cookie-consent__btn {
    padding: 0.5rem 1.25rem;
    font-size: 0.8125rem;
    white-space: nowrap;
  }

  /* --- Footer --- */
  .footer {
    padding-block: var(--space-lg);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.8125rem;
  }

  .footer__content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
  }

  .footer__link {
    color: var(--text-secondary);
    transition: color var(--transition-fast);

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

/* ============================================
   UTILITIES
   ============================================ */
@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;
  }

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

  .font-mono {
    font-family: "JetBrains Mono", monospace;
  }
}

/* ============================================
   SCROLL ANIMATIONS (Progressive Enhancement)
   ============================================ */
@supports (animation-timeline: view()) {
  .fade-up {
    animation: fade-up linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 30%;
  }

  @keyframes fade-up {
    from {
      opacity: 0;
      transform: translateY(2rem);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}