/* =================================================================
   Lattice AI — Stylesheet

   Architecture: CSS Cascade Layers (FOUND-02)
   Token System: CSS Custom Properties (FOUND-01)
   Typography: Fluid clamp() scaling (FOUND-03)
   Layout: Mobile-first min-width queries (FOUND-04)

   HOW TO EDIT:
   - Colors: Update :root variables in @layer tokens
   - Typography: Update font-size variables in @layer tokens
   - Spacing: Update space variables in @layer tokens
   - Components: Add styles in @layer components
   ================================================================= */

/* Layer order declaration — cascade precedence (FOUND-02)
   Later layers override earlier ones when specificity is equal.
   utilities > components > layout > base > tokens > reset */
@layer reset, tokens, base, layout, components, utilities;

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

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

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

  button {
    cursor: pointer;
    border: none;
    background: none;
    font: inherit;
  }

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

/* -----------------------------------------------------------------
   TOKENS — All design tokens as CSS custom properties (FOUND-01)

   HOW TO RE-THEME:
   Change --color-primary and its derived variants.
   All components reference these variables via var().
   ----------------------------------------------------------------- */
@layer tokens {
  :root {
    /* ── Colors ─────────────────────────────────────────────────── */
    /* Primary — Bright blue (locked decision) */
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-active: #1E40AF;
    --color-primary-muted: #DBEAFE;

    /* Text — Slate (locked decision) */
    --color-text: #0F172A;
    --color-text-secondary: #475569;

    /* Backgrounds — White base (locked decision) */
    --color-bg: #FFFFFF;
    --color-bg-subtle: #F8FAFC;

    /* Border */
    --color-border: #E2E8F0;

    /* Dark steel-black panel + cream-white foreground (problem bridge) */
    --color-steel-black: #1F2430;
    --color-cream-white: #F5F1E8;

    /* Cool gray scale (blue-tinted, locked decision) */
    --color-gray-100: #F1F5F9;
    --color-gray-200: #E2E8F0;
    --color-gray-300: #CBD5E1;
    --color-gray-400: #94A3B8;
    --color-gray-500: #64748B;
    --color-gray-600: #475569;
    --color-gray-700: #334155;

    /* ── Typography ─────────────────────────────────────────────── */
    /* Font family — Inter via Google Fonts CDN (locked decision) */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;

    /* Fluid font sizes using clamp() (FOUND-03)
       Formula: clamp(min, preferred, max)
       Base: 16px → 18px | H1: ~36px → 48px | H2: ~28px → 36px | H3: ~20px → 24px */
    --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --font-size-sm: clamp(0.875rem, 0.85rem + 0.125vw, 0.9375rem);
    --font-size-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.25rem);
    --font-size-h1: clamp(2.25rem, 1.8rem + 2.25vw, 3rem);
    --font-size-h2: clamp(1.75rem, 1.4rem + 1.75vw, 2.25rem);
    --font-size-h3: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);

    /* Font weights (locked decision: 400, 500, 700) */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;

    /* Line heights */
    --line-height-body: 1.6;
    --line-height-heading: 1.2;

    /* Letter spacing */
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;

    /* ── Spacing ────────────────────────────────────────────────── */
    --space-xs: 0.25rem;   /* 4px */
    --space-sm: 0.5rem;    /* 8px */
    --space-md: 1rem;      /* 16px */
    --space-lg: 1.5rem;    /* 24px */
    --space-xl: 2rem;      /* 32px */
    --space-2xl: 3rem;     /* 48px */
    --space-3xl: 4rem;     /* 64px */
    --space-4xl: 6rem;     /* 96px */

    /* Section vertical gap — fluid between mobile and desktop */
    --section-gap: clamp(2rem, 1.5rem + 2vw, 3rem);

    /* ── Layout ─────────────────────────────────────────────────── */
    --container-max: 1200px;
    --container-padding: clamp(1rem, 0.5rem + 2.5vw, 2rem);

    /* ── Cards & Surfaces ───────────────────────────────────────── */
    --radius-sm: 0.375rem;  /* 6px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
                 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
                 0 4px 6px -4px rgba(0, 0, 0, 0.1);

    /* ── Transitions ────────────────────────────────────────────── */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* ── Header ─────────────────────────────────────────────────── */
    --header-height: 70px;
  }
}

/* -----------------------------------------------------------------
   BASE — Element defaults (no classes, just elements)
   ----------------------------------------------------------------- */
@layer base {
  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-body);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  h1 {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-heading);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text);
  }

  h2 {
    font-size: var(--font-size-h2);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-heading);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text);
  }

  h3 {
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-heading);
    color: var(--color-text);
  }

  p {
    margin-bottom: var(--space-md);
  }

  p:last-child {
    margin-bottom: 0;
  }

  a:focus-visible,
  button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
  }
}

/* -----------------------------------------------------------------
   LAYOUT — Structural classes (containers, sections, grids)
   ----------------------------------------------------------------- */
@layer layout {
  .container {
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-padding);
    width: 100%;
  }

  .section {
    padding-block: var(--section-gap);
  }

  /* Offset scroll target for sticky header */
  section[id] {
    scroll-margin-top: var(--header-height, 70px);
  }
}

/* -----------------------------------------------------------------
   COMPONENTS — Component styles added in subsequent phases

   Phase 2: nav, hero, problem
   Phase 3: product cards, how-it-works, use cases, integrations, FAQ
   Phase 4: agent cards, audit form, pricing, final CTA
   Phase 5: footer
   ----------------------------------------------------------------- */
@layer components {

  /* ── Site Header ──────────────────────────────────────────── */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: var(--color-bg);
    box-shadow: var(--shadow-sm);
    padding-block: var(--space-sm);
  }

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

  .site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    letter-spacing: var(--letter-spacing-tight);
  }

  .site-logo-text {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-h4);
    color: var(--color-text);
  }

  /* ── Navigation ───────────────────────────────────────────── */
  .nav-list {
    display: flex;
    gap: var(--space-lg);
  }

  .nav-link {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
    padding: var(--space-xs) 0;
  }

  .nav-link:hover,
  .nav-link:focus-visible {
    color: var(--color-primary);
  }

  /* ── Nav Toggle / Hamburger ───────────────────────────────── */
  .nav-toggle {
    display: none;
    padding: var(--space-xs);
    z-index: 60;
  }

  .hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background var(--transition-base);
  }

  .hamburger::before,
  .hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition-slow), top var(--transition-slow);
  }

  .hamburger::before {
    top: -7px;
  }

  .hamburger::after {
    top: 7px;
  }

  /* Hamburger → X animation when open */
  .nav-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
  }

  .nav-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
  }

  /* ── Mobile Navigation ────────────────────────────────────── */
  @media (max-width: 767px) {
    .nav-toggle {
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .nav-menu {
      position: absolute;
      top: var(--header-height);
      left: 0;
      right: 0;
      background-color: var(--color-bg);
      box-shadow: var(--shadow-lg);
      padding: var(--space-xl) var(--container-padding);
      transform: translateY(-10px);
      opacity: 0;
      visibility: hidden;
      transition: transform var(--transition-slow),
                  opacity var(--transition-slow),
                  visibility var(--transition-slow);
      z-index: 40;
    }

    .nav-menu.nav-open {
      transform: translateY(0);
      opacity: 1;
      visibility: visible;
    }

    .nav-list {
      flex-direction: column;
      align-items: center;
      gap: var(--space-md);
    }

    .nav-link {
      font-size: var(--font-size-base);
      padding: var(--space-sm) 0;
    }

    .header-cta {
      display: block;
      width: 100%;
      text-align: center;
      margin-top: var(--space-md);
    }
  }

  /* Desktop: nav inline, toggle hidden */
  @media (min-width: 768px) {
    .nav-menu {
      display: flex;
      align-items: center;
      gap: var(--space-xl);
    }
  }

  /* ── Buttons ──────────────────────────────────────────────── */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    transition: background var(--transition-base),
                color var(--transition-base),
                box-shadow var(--transition-base);
    cursor: pointer;
    text-decoration: none;
    border: 2px solid transparent;
  }

  .btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
  }

  .btn-lg {
    padding: var(--space-sm) var(--space-xl);
    font-size: var(--font-size-lg);
  }

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

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

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

  .btn-ghost {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
  }

  .btn-ghost:hover {
    background: var(--color-primary);
    color: var(--color-bg);
  }

  /* ── Hero Section ─────────────────────────────────────────── */
  .hero-content {
    text-align: center;
    max-width: 800px;
    margin-inline: auto;
  }

  #hero {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-xl);
  }

  #hero h1 {
    margin-bottom: var(--space-lg);
  }

  .hero-title {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  .hero-rotating {
    position: relative;
    display: block;
  }

  /* Invisible sizer: all phrases stacked in one grid cell, so the box always
     reserves the height of the tallest phrase at the current viewport width. */
  .hero-rotating-sizer {
    display: grid;
    visibility: hidden;
  }

  .hero-rotating-sizer > span {
    grid-area: 1 / 1;
  }

  .hero-rotating-text {
    color: var(--color-primary);
  }

  /* Overlay the animated text on the sizer so typing never reflows the page. */
  .hero-rotating .hero-rotating-text {
    position: absolute;
    inset: 0;
  }

  .hero-rotating-text.hero-typing {
    border-right: 2px solid var(--color-primary);
    animation: hero-cursor-blink 0.6s steps(1) infinite;
  }

  @keyframes hero-cursor-blink {
    0%, 100% { border-color: var(--color-primary); }
    50% { border-color: transparent; }
  }

  @media (prefers-reduced-motion: reduce) {
    .hero-rotating-text.hero-typing {
      animation: none;
      border-right: none;
    }
  }

  .hero-subtitle {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin-inline: auto;
    margin-bottom: var(--space-xl);
  }

  .hero-ctas {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-xl);
  }

  .hero-illustration {
    max-width: 520px;
    margin-inline: auto;
  }

  .how-it-works-img {
    display: block;
    width: 65%;
    height: auto;
    margin: 0 auto var(--space-xl);
    border-radius: var(--radius-lg);
  }

  /* Mobile: stack CTAs vertically */
  @media (max-width: 480px) {
    .hero-ctas {
      flex-direction: column;
      align-items: center;
    }

    .hero-ctas .btn {
      width: 100%;
    }
  }

  /* ── Section Variants ─────────────────────────────────────── */
  .section-alt {
    background-color: var(--color-bg-subtle);
  }

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

  .section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin-inline: auto;
    margin-bottom: var(--space-2xl);
  }

  /* ── Problem Section (interactive ChatGPT mock) ───────────── */
  .problem-eyebrow {
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
  }

  .problem-chat {
    position: relative;
    width: 360px;
    height: 640px;
    max-width: 100%;
    margin: var(--space-xl) auto 0;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg);
    border: 10px solid var(--color-steel-black);
    border-radius: 36px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
  }

  /* Phone notch */
  .problem-chat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 22px;
    background-color: var(--color-steel-black);
    border-radius: 0 0 14px 14px;
    z-index: 2;
  }

  .problem-chat-header {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: calc(var(--space-md) + 8px) var(--space-md) var(--space-sm);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-subtle);
  }

  .problem-chat-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    flex: 0 0 28px;
    border-radius: var(--radius-md);
    background-color: #000;
  }

  .problem-chat-label {
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
  }

  .problem-chat-model {
    margin-left: auto;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 2px var(--space-xs);
  }

  .problem-chat-body {
    flex: 1 1 auto;
    min-height: 0;
    padding: var(--space-md);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .problem-chat-user {
    display: inline-block;
    max-width: 85%;
    margin-left: auto;
    margin-bottom: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-bg-subtle);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    /* Right-align the bubble within the body */
    float: right;
    clear: both;
  }

  .problem-chat-assistant {
    display: flex;
    gap: var(--space-sm);
    clear: both;
  }

  .problem-chat-assistant .problem-chat-avatar {
    margin-top: 2px;
  }

  .problem-chat-content {
    flex: 1 1 auto;
    min-width: 0;
    color: var(--color-text);
  }

  .problem-aitext {
    color: var(--color-text);
  }

  .problem-cursor {
    display: inline-block;
    width: 2px;
    height: 1em;
    margin-left: 1px;
    vertical-align: text-bottom;
    background-color: var(--color-primary);
    animation: problem-cursor-blink 1s steps(2, start) infinite;
  }

  @keyframes problem-cursor-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
  }

  .problem-output {
    margin-top: var(--space-sm);
  }

  /* List recommendations */
  .problem-rec {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    border-top: 1px solid var(--color-border);
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

  .problem-rec.problem-revealed {
    opacity: 1;
    transform: none;
  }

  .problem-rec-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    flex: 0 0 22px;
    border-radius: var(--radius-sm);
    background-color: var(--color-primary-muted);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
  }

  .problem-rec-info {
    display: flex;
    flex-direction: column;
  }

  .problem-rec-name {
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
  }

  .problem-rec-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
  }

  /* Booking card */
  .problem-booking {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

  .problem-booking.problem-revealed {
    opacity: 1;
    transform: none;
  }

  .problem-booking-provider {
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-sm);
  }

  .problem-slot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
  }

  .problem-slot {
    width: 100%;
  }

  .problem-confirm-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
  }

  /* Food grid */
  .problem-food-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .problem-food-card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

  .problem-food-card.problem-revealed {
    opacity: 1;
    transform: none;
  }

  .problem-food-pic {
    height: 70px;
    background-color: var(--color-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
  }

  .problem-food-pic svg {
    width: 28px;
    height: 28px;
  }

  .problem-food-pic.c-coral { background-color: #FEE2E2; }
  .problem-food-pic.c-green { background-color: #DCFCE7; }
  .problem-food-pic.c-purple { background-color: #EDE9FE; }
  .problem-food-pic.c-amber { background-color: #FEF3C7; }

  .problem-food-name {
    font-weight: var(--font-weight-bold);
    padding: var(--space-sm) var(--space-sm) 0;
  }

  .problem-food-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: 2px var(--space-sm) var(--space-xs);
  }

  .problem-food-price {
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    padding: 0 var(--space-sm) var(--space-sm);
  }

  .problem-food-add {
    width: 100%;
    margin-top: auto;
    border-radius: 0;
  }

  /* Callout — soft red surface (brand-adjacent danger family) */
  .problem-callout {
    margin-top: var(--space-md);
    padding: var(--space-md);
    background-color: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: var(--radius-md);
    transition: opacity var(--transition-base);
  }

  .problem-callout-title {
    margin: 0 0 var(--space-xs);
    font-weight: var(--font-weight-bold);
    color: #B91C1C;
  }

  .problem-callout-sub {
    margin: 0;
    font-size: var(--font-size-sm);
    color: #B91C1C;
  }

  /* Switcher pills */
  .problem-switcher {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
  }

  .problem-pill {
    padding: var(--space-xs) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background-color: var(--color-bg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
  }

  .problem-pill:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
  }

  .problem-pill--active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
  }

  /* Bridge — dark steel-black panel */
  .problem-bridge {
    text-align: center;
    margin-top: var(--space-2xl);
    padding: var(--space-2xl) var(--space-xl);
    background-color: var(--color-steel-black);
    color: var(--color-cream-white);
    border-radius: var(--radius-xl);
  }

  .problem-bridge-line {
    position: relative;
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-bold);
    color: var(--color-cream-white);
    margin-bottom: 0;
  }

  /* Invisible sizer reserves the full sentence's height (including wrapping) so
     the typewriter reveal and clear/retype loop never shift the page. */
  .problem-bridge-sizer {
    visibility: hidden;
  }

  .problem-bridge-text {
    position: absolute;
    inset: 0;
  }

  /* Tighten the gap between the problem section and the How It Works image */
  #problem {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-xl);
  }

  #how-it-works {
    padding-top: var(--space-md);
  }

  @media (prefers-reduced-motion: reduce) {
    .problem-cursor {
      animation: none;
    }

    .problem-rec,
    .problem-booking,
    .problem-food-card,
    .problem-callout {
      transition: none;
    }
  }

  /* ── Products Section ────────────────────────────────────── */
  .products-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
  }

  @media (min-width: 768px) {
    .products-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  .product-card {
    background-color: var(--color-bg);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    display: flex;
    flex-direction: column;
  }

  .product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
  }

  .product-icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-md);
  }

  .product-icon svg {
    width: 48px;
    height: 48px;
  }

  .product-card h3 {
    margin-bottom: var(--space-md);
  }

  .product-tagline {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
  }

  .product-capabilities {
    text-align: left;
    margin-bottom: var(--space-lg);
  }

  .product-capabilities li {
    padding: var(--space-xs) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
  }

  .product-capabilities li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
  }

  .product-cta {
    margin-top: auto;
  }

  /* ── Use Cases Section ───────────────────────────────────── */
  .use-cases-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
  }

  @media (min-width: 640px) {
    .use-cases-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 1024px) {
    .use-cases-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  .use-case-card {
    background-color: #0F172A;
    background-image: linear-gradient(rgba(15, 23, 42, 0.55), rgba(15, 23, 42, 0.80)), var(--card-bg);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    overflow: hidden;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
  }

  .use-case-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
  }

  .use-case-card h3 {
    color: #FFFFFF;
    margin-bottom: var(--space-sm);
  }

  .use-case-card p {
    color: rgba(255, 255, 255, 0.85);
    font-size: var(--font-size-sm);
  }

  .use-cases-footer {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    max-width: 640px;
    margin-inline: auto;
    margin-top: var(--space-2xl);
  }

  /* ── FAQ Section ─────────────────────────────────────────── */
  .faq-list {
    max-width: 800px;
    margin-inline: auto;
    margin-top: var(--space-2xl);
  }

  .faq-item {
    border-bottom: 1px solid var(--color-border);
  }

  .faq-item:first-child {
    border-top: 1px solid var(--color-border);
  }

  .faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-lg) 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    text-align: left;
    cursor: pointer;
    background: none;
    border: none;
    font-family: var(--font-family);
    gap: var(--space-md);
    line-height: var(--line-height-body);
  }

  .faq-question:hover {
    color: var(--color-primary);
  }

  .faq-chevron {
    flex-shrink: 0;
    transition: transform var(--transition-base);
    color: var(--color-gray-400);
  }

  .faq-question[aria-expanded="true"] .faq-chevron {
    transform: rotate(180deg);
  }

  .faq-answer {
    padding-bottom: var(--space-lg);
  }

  .faq-answer[hidden] {
    display: none;
  }

  .faq-answer p {
    color: var(--color-text-secondary);
    line-height: var(--line-height-body);
  }

  /* ── Agent Cards Section ─────────────────────────────── */
  .agents-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
  }

  @media (min-width: 768px) {
    .agents-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  .agent-card {
    background-color: var(--color-bg);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    overflow: hidden;
    border-top: 4px solid var(--color-border);
  }

  .agent-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
  }

  .agent-card--marketing {
    border-top-color: #16A34A;
  }

  .agent-card--sales {
    border-top-color: var(--color-primary);
  }

  .agent-card--support {
    border-top-color: #9333EA;
  }

  .agent-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
  }

  .agent-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .agent-icon svg {
    width: 36px;
    height: 36px;
  }

  .agent-header h3 {
    margin-bottom: 0;
  }

  .agent-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    font-size: var(--font-size-sm);
  }

  .chat-mockup {
    background-color: var(--color-bg-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
  }

  .chat-bubble {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    max-width: 85%;
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-body);
  }

  .chat-bubble:last-child {
    margin-bottom: 0;
  }

  .chat-bubble--visitor {
    background-color: var(--color-gray-200);
    color: var(--color-text);
    margin-left: auto;
    border-bottom-right-radius: var(--radius-sm);
    text-align: right;
  }

  .chat-bubble--agent {
    background-color: var(--color-primary-muted);
    color: var(--color-text);
    margin-right: auto;
    border-bottom-left-radius: var(--radius-sm);
  }

  .chat-bubble p {
    margin-bottom: 0;
  }

  .agent-capabilities {
    text-align: left;
  }

  .agent-capabilities li {
    padding: var(--space-xs) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
  }

  .agent-capabilities li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
  }

  /* ── Audit Form Section ──────────────────────────────── */
  .audit-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: start;
    margin-top: var(--space-2xl);
  }

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

  .audit-info h3 {
    margin-bottom: var(--space-lg);
  }

  .audit-benefits li {
    padding: var(--space-xs) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
  }

  .audit-benefits li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
  }

  .form-group {
    margin-bottom: var(--space-lg);
  }

  .form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--color-text);
  }

  .form-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-base);
    background: var(--color-bg);
  }

  .form-input:focus {
    border-color: var(--color-primary);
    outline: 2px solid var(--color-primary);
    outline-offset: 0;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  }

  .form-input.form-input--error {
    border-color: #DC2626;
  }

  .form-error {
    display: none;
    color: #DC2626;
    font-size: var(--font-size-sm);
    margin-top: var(--space-xs);
  }

  .form-error.form-error--visible {
    display: block;
  }

  .audit-submit {
    width: 100%;
    margin-top: var(--space-sm);
  }

  .audit-success {
    text-align: center;
    padding: var(--space-2xl);
  }

  .audit-success[hidden] {
    display: none;
  }

  .audit-success-message {
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
  }

  .audit-social-proof {
    text-align: center;
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    margin-top: var(--space-xl);
    font-style: italic;
  }

  /* -- Contact Form Section ---------------------------------------- */
  .contact-form-wrapper {
    max-width: 600px;
    margin: var(--space-2xl) auto 0;
  }

  .contact-textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-base);
    background: var(--color-bg);
    resize: vertical;
    min-height: 120px;
  }

  .contact-textarea:focus {
    border-color: var(--color-primary);
    outline: 2px solid var(--color-primary);
    outline-offset: 0;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  }

  .contact-textarea.form-input--error {
    border-color: #DC2626;
  }

  .contact-submit {
    width: 100%;
    margin-top: var(--space-sm);
  }

  .contact-success {
    text-align: center;
    padding: var(--space-2xl);
  }

  .contact-success[hidden] {
    display: none;
  }

  .contact-success-message {
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
  }

  /* ── Form loading and error states (quick-2) ─────────── */
  .btn[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
  }

  .form-submit-error {
    color: #DC2626;
    font-size: var(--font-size-sm);
    text-align: center;
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background-color: #FEF2F2;
    border-radius: var(--radius-md);
  }

  /* ── Blog Section ─────────────────────────────────────────── */
  .blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
  }

  @media (min-width: 640px) {
    .blog-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 1024px) {
    .blog-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  .blog-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    cursor: pointer;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
  }

  .blog-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
  }

  .blog-card:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
  }

  .blog-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
  }

  .blog-card-content {
    padding: var(--space-lg);
  }

  .blog-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
  }

  .blog-tag {
    display: inline-block;
    background-color: var(--color-primary-muted);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: 2px var(--space-sm);
    border-radius: var(--radius-xl);
  }

  .blog-card-title {
    margin-bottom: var(--space-sm);
  }

  .blog-card-date {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
  }

  .blog-card-excerpt {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
  }

  .blog-card-link {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
  }

  .blog-loading {
    text-align: center;
    color: var(--color-text-secondary);
    padding: var(--space-2xl) 0;
  }

  .blog-empty {
    text-align: center;
    color: var(--color-gray-400);
    padding: var(--space-2xl) 0;
    font-size: var(--font-size-lg);
  }

  /* Blog detail view */
  .blog-detail[hidden] {
    display: none;
  }

  .blog-back {
    margin-bottom: var(--space-xl);
  }

  .blog-detail-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-xl);
  }

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

  .blog-detail-meta {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-lg);
  }

  .blog-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-xl);
  }

  .blog-detail-content {
    max-width: 720px;
    margin-inline: auto;
    line-height: 1.8;
    color: var(--color-text);
  }

  .blog-detail-content h2,
  .blog-detail-content h3 {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
  }

  .blog-detail-content p {
    margin-bottom: var(--space-lg);
  }

  .blog-detail-content ul,
  .blog-detail-content ol {
    margin-bottom: var(--space-lg);
    padding-left: var(--space-xl);
    list-style: disc;
  }

  .blog-detail-content li {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
  }

  .blog-detail-content a {
    color: var(--color-primary);
    text-decoration: underline;
  }

  .blog-detail-content a:hover {
    color: var(--color-primary-hover);
  }

  .blog-detail-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--space-lg) 0;
  }

  .blog-detail-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--space-lg);
    margin: var(--space-lg) 0;
    color: var(--color-text-secondary);
    font-style: italic;
  }

  /* ── Final CTA Section ───────────────────────────────── */
  .section-dark {
    background-color: #0F172A;
    color: var(--color-bg);
  }

  .section-dark .container {
    text-align: center;
  }

  .final-cta-title {
    color: var(--color-bg);
    margin-bottom: var(--space-xl);
    font-size: var(--font-size-h2);
  }

  /* ── Pricing Section ─────────────────────────────────── */
  .pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
    align-items: start;
  }

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

  @media (min-width: 1024px) {
    .pricing-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  }

  .pricing-includes {
    text-align: center;
    margin-top: var(--space-xl);
  }

  .pricing-includes-label {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
  }

  .pricing-includes-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-xs);
  }

  .pricing-includes-badge {
    display: inline-block;
    background-color: var(--color-primary-muted);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-xl);
  }

  .pricing-small-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--space-sm);
  }

  .pricing-card {
    background-color: var(--color-bg);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    position: relative;
    border: 2px solid var(--color-border);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
  }

  .pricing-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
  }

  .pricing-card--highlighted {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
  }

  @media (min-width: 768px) {
    .pricing-card--highlighted {
      transform: scale(1.03);
    }

    .pricing-card--highlighted:hover {
      transform: scale(1.03) translateY(-2px);
    }
  }

  .pricing-badge {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--color-primary);
    color: var(--color-bg);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    white-space: nowrap;
  }

  .pricing-name {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-sm);
    text-align: center;
  }

  .pricing-price {
    text-align: center;
    margin-bottom: var(--space-md);
  }

  .pricing-amount {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
  }

  .pricing-period {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
  }

  .pricing-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    text-align: center;
    margin-bottom: var(--space-lg);
  }

  .pricing-features {
    margin-bottom: var(--space-xl);
  }

  .pricing-features li {
    padding: var(--space-xs) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
  }

  .pricing-features li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
  }

  .pricing-cta {
    margin-top: auto;
    width: 100%;
    text-align: center;
  }

  .pricing-cta--clicked {
    opacity: 0.7;
    cursor: default;
  }

  /* ── Footer ──────────────────────────────────────────── */
  .site-footer {
    background: var(--color-text);
    color: var(--color-bg);
    padding: var(--space-3xl) 0 var(--space-xl);
  }

  .footer-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    text-align: center;
  }

  .footer-brand {
    text-align: left;
  }

  .footer-logo {
    color: var(--color-bg);
    font-size: var(--font-size-lg);
    font-weight: 700;
    text-decoration: none;
  }

  .footer-nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-lg);
  }

  .footer-link {
    color: var(--color-gray-300);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
  }

  .footer-link:hover,
  .footer-link:focus-visible {
    color: var(--color-bg);
  }

  .footer-copyright {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
  }

  /* Logo image in header */
  .site-logo-img {
    display: block;
    height: 56px;
    width: auto;
  }

  @media (min-width: 768px) {
    .footer-inner {
      grid-template-columns: 1fr auto 1fr;
      text-align: left;
      align-items: baseline;
    }

    .footer-copyright {
      text-align: right;
    }
  }
}

/* -----------------------------------------------------------------
   UTILITIES — Helper classes
   ----------------------------------------------------------------- */
@layer utilities {
  /* Skip-to-content link (STRC-02) — visible only on keyboard focus */
  .skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-bg);
    padding: var(--space-sm) var(--space-md);
    z-index: 100;
    transition: top var(--transition-base);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    border-radius: 0 0 var(--radius-sm) 0;
  }

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

  /* Screen-reader only — visually hidden but accessible */
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
  }

  /* ── Blog post page — bottom CTA row (quick-21) ────────────────── */
  .blog-post-ctas {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
    max-width: 720px;
  }

  /* "View all posts" link below 3-post homepage preview (quick-21) */
  .blog-view-all {
    margin-top: var(--space-lg);
    text-align: center;
  }
}