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

@layer reset {
  html {
    box-sizing: border-box;
    -webkit-text-size-adjust: 100%;
  }

  body,
  header,
  nav,
  main,
  section,
  article,
  aside,
  footer,
  div,
  ul,
  ol,
  li,
  dl,
  dt,
  dd,
  figure,
  figcaption,
  details,
  summary,
  h1,
  h2,
  h3,
  h4,
  p,
  a,
  button,
  span {
    box-sizing: inherit;
  }

  body,
  h1,
  h2,
  h3,
  h4,
  p,
  ul,
  ol,
  dl,
  dd,
  figure {
    margin: 0;
  }

  ul,
  ol {
    padding: 0;
    list-style: none;
  }

  img,
  picture,
  svg {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
  }

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

@layer theme {
  :root {
    color-scheme: light;

    --bg-canvas: #F7FAFC;
    --bg-surface: #FFFFFF;
    --bg-subtle: #F1F5F9;
    --bg-mint: #ECFDF5;
    --bg-sky: #E0F2FE;
    --bg-amber: #FFFBEB;

    --ink-primary: #0F172A;
    --ink-secondary: #334155;
    --ink-muted: #475569;
    --ink-on-accent: #FFFFFF;
    --ink-emerald: #065F46;
    --ink-amber: #92400E;
    --ink-sky: #075985;

    --brand-primary: #047857;
    --brand-primary-hover: #065F46;
    --accent-sky-strong: #0369A1;
    --accent-amber: #B45309;

    --border-card: #CBD5E1;
    --border-control: #64748B;
    --border-mint: #A7F3D0;
    --border-amber: #FDE68A;

    --focus-ring: #0369A1;
    --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 24px rgba(15, 23, 42, 0.10);

    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-pill: 999px;

    --container-max: 70rem;
    --space-gutter: clamp(1rem, 3vw, 2rem);
    --space-section: clamp(2.25rem, 5vw, 4rem);
  }
}

@layer base {
  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--ink-primary);
    background-color: var(--bg-canvas);
    overflow-x: clip;
  }

  h1 {
    font-size: clamp(1.75rem, 1.35rem + 1.8vw, 2.75rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--ink-primary);
    text-wrap: balance;
    scroll-margin-block-start: 5.5rem;
  }

  h2 {
    font-size: clamp(1.375rem, 1.15rem + 1vw, 2rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.015em;
    color: var(--ink-primary);
    text-wrap: balance;
    scroll-margin-block-start: 5.5rem;
  }

  h3 {
    font-size: clamp(1.125rem, 1.05rem + 0.4vw, 1.35rem);
    font-weight: 700;
    line-height: 1.3;
    color: var(--ink-primary);
    text-wrap: balance;
  }

  h1,
  h2,
  h3,
  h4 {
    overflow-wrap: break-word;
  }

  p,
  li,
  dd,
  dt {
    text-wrap: pretty;
    overflow-wrap: break-word;
  }

  a {
    color: var(--accent-sky-strong);
    text-decoration-thickness: 0.1em;
    text-underline-offset: 0.2em;
    overflow-wrap: anywhere;
  }

  a:hover {
    color: var(--brand-primary);
  }

  :where(a, button, summary, [tabindex]):focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 3px;
    border-radius: 0.375rem;
  }

  #main-content:focus {
    outline: none;
  }
}

@layer components {
  .container {
    inline-size: min(100% - 2 * var(--space-gutter), var(--container-max));
    margin-inline: auto;
  }

  .skip-link {
    position: fixed;
    inset-block-start: 0.75rem;
    inset-inline-start: 0.75rem;
    z-index: 1000;
    padding: 0.75rem 1.25rem;
    min-block-size: 48px;
    display: inline-flex;
    align-items: center;
    background-color: var(--brand-primary);
    color: var(--ink-on-accent);
    font-weight: 700;
    text-decoration: none;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
  }

  .skip-link.visually-hidden:not(:focus):not(:focus-visible) {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  /* Header & Responsive Popover Navbar */
  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 50;
    background-color: var(--bg-surface);
    border-block-end: 1px solid var(--border-card);
  }

  .site-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-block-size: 4.5rem;
    padding-block: 0.5rem;
  }

  .brand-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-block-size: 48px;
    padding-inline: 0.25rem;
    text-decoration: none;
    color: var(--ink-primary);
    flex-shrink: 0;
  }

  .brand-logo-img {
    inline-size: auto;
    block-size: 2.35rem;
    object-fit: contain;
  }

  .badge-beta {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-pill);
    background-color: var(--bg-mint);
    color: var(--ink-emerald);
    border: 1px solid var(--border-mint);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    line-height: 1.2;
  }

  .site-nav {
    display: flex;
    align-items: center;
  }

  .menu-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-inline-size: 48px;
    min-block-size: 48px;
    padding: 0.5rem 0.9rem;
    background-color: var(--bg-surface);
    color: var(--ink-primary);
    border: 2px solid var(--border-control);
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: 0.9375rem;
    cursor: pointer;
    anchor-name: --menu-button;
    white-space: nowrap;
  }

  .menu-button:hover {
    background-color: var(--bg-subtle);
    border-color: var(--ink-primary);
  }

  .site-menu {
    padding: 0;
  }

  .site-menu[popover] {
    inset: auto;
    inset-block-start: 4.75rem;
    inset-block-start: anchor(--menu-button bottom);
    inset-inline-end: var(--space-gutter);
    inset-inline-end: anchor(--menu-button right);
    margin: 0.5rem 0 0;
    padding: 0.5rem;
    min-inline-size: 13.5rem;
    background-color: var(--bg-surface);
    border: 2px solid var(--border-control);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    color: var(--ink-primary);
  }

  .site-menu[popover]::backdrop {
    background-color: rgba(15, 23, 42, 0.22);
  }

  .site-menu[popover]:where(:popover-open, .\:popover-open) {
    display: grid;
    gap: 0.25rem;
  }

  .nav-link {
    display: flex;
    align-items: center;
    min-block-size: 48px;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--ink-primary);
    font-weight: 700;
    font-size: 0.9375rem;
    text-decoration: none;
    white-space: nowrap;
  }

  .nav-link:hover {
    background-color: var(--bg-subtle);
    color: var(--brand-primary);
  }

  .nav-link[aria-current="page"] {
    background-color: var(--bg-mint);
    color: var(--ink-emerald);
    border: 1px solid var(--border-mint);
  }

  .site-header.is-wide .menu-button {
    display: none;
  }

  .site-header.is-wide .site-menu {
    position: static;
    inset: auto;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    min-inline-size: 0;
    margin: 0;
    padding: 0;
    background-color: transparent;
    border: 0;
    box-shadow: none;
  }

  .site-header.is-wide .nav-link {
    border-radius: var(--radius-pill);
    padding-inline: 1rem;
  }

  .site-header.is-measuring .site-menu,
  .site-header.is-measuring .nav-link {
    transition: none;
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-block-size: 48px;
    padding: 0.75rem 1.35rem;
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: 1rem;
    line-height: 1.2;
    text-decoration: none;
    border: 2px solid transparent;
    cursor: pointer;
    transition: background-color 140ms ease, border-color 140ms ease, transform 140ms ease;
  }

  .btn:active {
    transform: scale(0.98);
  }

  .btn-primary {
    background-color: var(--brand-primary);
    color: var(--ink-on-accent);
    border-color: var(--brand-primary);
  }

  .btn-primary:hover {
    background-color: var(--brand-primary-hover);
    border-color: var(--brand-primary-hover);
    color: var(--ink-on-accent);
  }

  .btn-secondary {
    background-color: var(--bg-surface);
    color: var(--ink-primary);
    border-color: var(--border-control);
  }

  .btn-secondary:hover {
    background-color: var(--bg-subtle);
    border-color: var(--ink-primary);
    color: var(--ink-primary);
  }

  .btn-sky {
    background-color: var(--accent-sky-strong);
    color: var(--ink-on-accent);
    border-color: var(--accent-sky-strong);
  }

  .btn-sky:hover {
    background-color: var(--ink-sky);
    border-color: var(--ink-sky);
    color: var(--ink-on-accent);
  }

  .button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  /* Hero Section */
  .hero {
    padding-block: clamp(2rem, 5vw, 4rem);
    background: linear-gradient(180deg, var(--bg-sky) 0%, var(--bg-mint) 55%, var(--bg-canvas) 100%);
    border-block-end: 1px solid var(--border-card);
  }

  .hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3rem);
    align-items: center;
  }

  .hero-copy {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.15rem;
    justify-items: start;
  }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-pill);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-mint);
    color: var(--ink-emerald);
    font-weight: 700;
    font-size: 0.875rem;
  }

  .lead-copy {
    font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.2rem);
    color: var(--ink-secondary);
    max-inline-size: 54ch;
  }

  .hero-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: clamp(1.25rem, 3vw, 2rem);
    box-shadow: var(--shadow-md);
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.25rem;
    justify-items: center;
    text-align: center;
  }

  .hero-art-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
  }

  .hero-app-icon {
    inline-size: clamp(6.5rem, 22vw, 9.5rem);
    block-size: auto;
    aspect-ratio: 1 / 1;
    border-radius: 1.65rem;
  }

  .hero-wordmark {
    inline-size: clamp(11rem, 38vw, 15rem);
    block-size: auto;
    aspect-ratio: 640 / 293;
  }

  .spec-strip {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    inline-size: 100%;
    padding-block-start: 0.75rem;
    border-block-start: 1px solid var(--border-card);
  }

  .spec-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-pill);
    background-color: var(--bg-subtle);
    color: var(--ink-primary);
    font-size: 0.875rem;
    font-weight: 700;
  }

  /* Generic Sections */
  .section {
    padding-block: var(--space-section);
  }

  .section-mint {
    background-color: var(--bg-mint);
    border-block-start: 1px solid var(--border-mint);
  }

  .section-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.65rem;
    max-inline-size: 62ch;
    margin-block-end: clamp(1.5rem, 3vw, 2.25rem);
  }

  .section-subcopy {
    color: var(--ink-secondary);
    font-size: 1.0625rem;
  }

  .step-grid {
    display: grid;
    gap: 1.15rem;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  }

  .step-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 1.35rem;
    box-shadow: var(--shadow-sm);
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.65rem;
    align-content: start;
  }

  .step-number {
    inline-size: 2.25rem;
    block-size: 2.25rem;
    border-radius: 50%;
    background-color: var(--brand-primary);
    color: var(--ink-on-accent);
    display: grid;
    place-items: center;
    font-weight: 800;
    font-size: 1rem;
  }

  .step-card p {
    color: var(--ink-secondary);
  }

  /* Beta CTA Box */
  .beta-banner {
    background-color: var(--bg-surface);
    border: 2px solid var(--border-mint);
    border-radius: var(--radius-lg);
    padding: clamp(1.5rem, 4vw, 2.5rem);
    box-shadow: var(--shadow-md);
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
  }

  .beta-banner .section-header {
    margin-block-end: 0;
  }

  .copy-feedback {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--ink-emerald);
    min-block-size: 1.5rem;
  }

  /* Page Hero (Subpages: About, Privacy, Terms) */
  .page-hero {
    padding-block: clamp(2rem, 4vw, 3rem);
    background-color: var(--bg-surface);
    border-block-end: 1px solid var(--border-card);
  }

  .page-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.75rem;
    max-inline-size: 65ch;
  }

  .meta-line {
    font-size: 0.9375rem;
    color: var(--ink-muted);
    font-weight: 600;
  }

  /* Legal & Prose Content */
  .prose-stack {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.75rem;
  }

  .prose-stack > * {
    max-inline-size: 68ch;
  }

  .prose-section {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: clamp(1.25rem, 3vw, 1.75rem);
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.85rem;
  }

  .prose-section h2 {
    overflow-wrap: anywhere;
  }

  .prose-section p,
  .prose-section li {
    color: var(--ink-secondary);
    max-inline-size: 65ch;
  }

  .bullet-list {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.55rem;
    padding-inline-start: 1.25rem;
    list-style: disc;
  }

  .notice-box {
    background-color: var(--bg-amber);
    border: 1px solid var(--border-amber);
    border-inline-start: 4px solid var(--accent-amber);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    color: var(--ink-primary);
  }

  .notice-box strong {
    color: var(--ink-amber);
  }

  /* Definition List & FAQ */
  .info-dl {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.75rem;
  }

  .info-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.25rem;
    padding-block-end: 0.75rem;
    border-block-end: 1px solid var(--border-card);
  }

  .info-row:last-child {
    padding-block-end: 0;
    border-block-end: 0;
  }

  .info-row dt {
    font-weight: 700;
    color: var(--ink-primary);
  }

  .info-row dd {
    color: var(--ink-secondary);
  }

  .faq-heading {
    margin-block-end: 1rem;
  }

  .faq-list {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.75rem;
  }

  .faq-item {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
  }

  .faq-item summary {
    padding: 1rem 1.25rem;
    min-block-size: 48px;
    font-weight: 700;
    color: var(--ink-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    list-style: none;
  }

  .faq-item summary::-webkit-details-marker {
    display: none;
  }

  .faq-chevron {
    flex-shrink: 0;
    transition: transform 150ms ease;
  }

  .faq-item[open] .faq-chevron {
    transform: rotate(180deg);
  }

  .faq-body {
    padding: 0 1.25rem 1.15rem;
    color: var(--ink-secondary);
    max-inline-size: 62ch;
  }

  /* Footer */
  .site-footer {
    background-color: var(--bg-surface);
    border-block-start: 1px solid var(--border-card);
    padding-block: 2.25rem;
  }

  .footer-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
  }

  .footer-brand {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.5rem;
    max-inline-size: 42ch;
  }

  .footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.25rem;
    align-items: center;
  }

  .footer-link {
    display: inline-flex;
    align-items: center;
    min-block-size: 48px;
    font-weight: 600;
    color: var(--ink-secondary);
    text-decoration: none;
  }

  .footer-link:hover {
    color: var(--brand-primary);
    text-decoration: underline;
  }

  .footer-copy {
    color: var(--ink-muted);
    font-size: 0.875rem;
    padding-block-start: 1rem;
    border-block-start: 1px solid var(--border-card);
  }
}

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

  @media (min-width: 48rem) {
    .hero-grid {
      grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    }

    .info-row {
      grid-template-columns: 12rem minmax(0, 1fr);
      gap: 1rem;
      align-items: baseline;
    }

    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 2rem;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }

    .btn,
    .faq-chevron {
      transition: none;
      animation: none;
    }
  }
}