:root {
  /* Color tokens */
  --color-brand-primary: #58cc02;
  --color-brand-primary-dark: #46a301;
  --color-brand-primary-light: #8ddf4d;
  --color-bg: #f9f9f7;
  --color-card: #ffffff;
  --color-elevated: #f0fdf4;
  --color-text: #1f2937;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6b7280;
  --color-inverse: #ffffff;
  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;
  --color-focus: #58cc02;
  --color-warning: #f59e0b;
  --color-warning-bg: #fef3c7;
  --color-warning-text: #78350f;
  --color-code-bg: #0f172a;
  --color-code-text: #e2e8f0;
  --color-code-border: #1e293b;

  /* 8px spacing grid */
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 40px;
  --space-8: 48px;
  --space-9: 64px;
  --space-10: 80px;

  /* Radius + shadow */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 9999px;
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.06);
  --shadow-md: 0 10px 20px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 18px 40px rgba(17, 24, 39, 0.12);

  /* Typography scale */
  --font-family-base: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-size-h1: clamp(30px, 4.5vw, 48px);
  --font-size-h2: clamp(20px, 2.5vw, 28px);
  --font-size-body: 16px;
  --font-size-caption: 13px;
  --line-height-base: 1.5;

  /* Motion - subtle and calm */
  --motion-fast: 120ms;
  --motion-normal: 180ms;
  --motion-ease: ease-out;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

h1,
.h1 {
  font-size: var(--font-size-h1);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-4);
}

h2,
.h2 {
  font-size: var(--font-size-h2);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-3);
}

p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-secondary);
}

h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.05rem;
  line-height: 1.35;
}

.caption {
  font-size: var(--font-size-caption);
  color: var(--color-text-muted);
}

/* Layout primitives */
.container {
  width: min(100% - (var(--space-5) * 2), 1120px);
  margin-inline: auto;
}

.section {
  padding-block: var(--space-9);
}

[id] {
  scroll-margin-top: 80px;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
  padding: var(--space-5);
  transition: box-shadow var(--motion-normal) var(--motion-ease), transform var(--motion-fast) var(--motion-ease);
}

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

.grid {
  display: grid;
  gap: var(--space-5);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Button primitives */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 10px var(--space-5);
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform var(--motion-fast) var(--motion-ease),
    box-shadow var(--motion-normal) var(--motion-ease),
    background-color var(--motion-normal) var(--motion-ease),
    color var(--motion-normal) var(--motion-ease),
    border-color var(--motion-normal) var(--motion-ease);
}

.btn:focus-visible,
a:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-focus), white 25%);
  outline-offset: 2px;
}

.btn-primary {
  color: var(--color-inverse);
  background: linear-gradient(
    135deg,
    var(--color-brand-primary),
    var(--color-brand-primary-dark)
  );
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  color: var(--color-brand-primary-dark);
  background: transparent;
  border-color: var(--color-brand-primary);
}

.btn-secondary:hover {
  background: color-mix(in srgb, var(--color-brand-primary-light), white 78%);
}

/* Existing scaffold regions */
.site-header {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}

.brand-logo {
  border-radius: 7px;
}

.brand-text {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-pill);
  padding: 8px var(--space-3);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-brand-primary-light), white 86%);
}

.nav-link[aria-current="page"] {
  color: var(--color-brand-primary-dark);
  background: color-mix(in srgb, var(--color-brand-primary-light), white 78%);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--color-border-strong);
  background: var(--color-card);
  color: var(--color-text);
  border-radius: var(--radius-pill);
  padding: 8px var(--space-3);
  font-size: 0.95rem;
  font-weight: 600;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -48px;
  z-index: 1000;
  background: var(--color-brand-primary-dark);
  color: var(--color-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: top var(--motion-fast) var(--motion-ease);
}

.skip-link:focus-visible {
  top: var(--space-3);
}

.site-footer {
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-8);
  padding: var(--space-5) 0;
}

.page-main {
  flex: 1;
  padding-block: var(--space-6) var(--space-8);
}

/* Phase 5: landing page */
.hero {
  padding-top: var(--space-6);
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(280px, 0.98fr);
  gap: var(--space-6);
  align-items: center;
}

.hero-copy p {
  max-width: 60ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.btn[aria-disabled="true"] {
  opacity: 0.6;
  pointer-events: none;
}

.hero-video-module {
  margin: 0;
  width: 100%;
  justify-self: center;
}

.hero-media-frame {
  width: 100%;
  max-width: 470px;
  margin-inline: auto;
  border-radius: 20px;
  background: linear-gradient(
    160deg,
    var(--color-brand-primary-light) 0%,
    var(--color-brand-primary) 50%,
    var(--color-brand-primary-dark) 100%
  );
  box-shadow: 0 22px 40px rgba(17, 24, 39, 0.16);
  padding: clamp(12px, 2.2vw, 20px);
}

.hero-video-shell {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.38);
  background: #0b0f14;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 9 / 19.5;
}

.hero-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.hero-video-play {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  background: color-mix(in srgb, var(--color-brand-primary-dark), black 5%);
  color: var(--color-inverse);
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

.hero-video-play[hidden] {
  display: none;
}

.hero-video-status {
  margin: var(--space-2) 0 0;
  text-align: center;
}

.screenshot-grid {
  margin-top: var(--space-4);
}

.screenshot-card {
  padding: var(--space-4);
  display: grid;
  gap: var(--space-3);
}

.screenshot-card img {
  width: 100%;
  max-width: 220px;
  margin-inline: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-card);
}

.family-controls-teaser {
  background: color-mix(in srgb, var(--color-brand-primary-light), white 88%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: center;
}

.footer-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
}

.footer-link:hover {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-brand-primary-light), white 84%);
}

.footer-link + .footer-link::before {
  content: "•";
  margin-right: var(--space-2);
  color: var(--color-border-strong);
}

/* Legal and technical pages */
.legal-page {
  max-width: 820px;
  margin-inline: auto;
}

.legal-top-nav {
  margin-bottom: var(--space-4);
}

.back-home-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
}

.back-arrow {
  font-size: 1rem;
  line-height: 1;
}

.draft-notice {
  border: 1px solid color-mix(in srgb, var(--color-warning), white 50%);
  background: color-mix(in srgb, var(--color-warning), white 92%);
  color: var(--color-warning-text);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
}

.legal-section + .legal-section {
  margin-top: var(--space-5);
}

.legal-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--color-text-secondary);
}

.legal-list li + li {
  margin-top: var(--space-2);
}

.code-snippet {
  margin: 0;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  border: 1px solid var(--color-code-border);
}

/* Spacing utilities */
.mt-0 {
  margin-top: var(--space-0);
}

.mt-2 {
  margin-top: var(--space-2);
}

.mt-4 {
  margin-top: var(--space-4);
}

.mt-6 {
  margin-top: var(--space-6);
}

.mb-0 {
  margin-bottom: var(--space-0);
}

.mb-2 {
  margin-bottom: var(--space-2);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-6 {
  margin-bottom: var(--space-6);
}

.py-4 {
  padding-block: var(--space-4);
}

.py-6 {
  padding-block: var(--space-6);
}

.py-8 {
  padding-block: var(--space-8);
}

/* Responsive helpers */
@media (max-width: 900px) {
  .header-content {
    min-height: 64px;
    position: relative;
  }

  .site-nav {
    margin-left: 0;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
  }

  .nav-list {
    position: absolute;
    right: 0;
    top: calc(100% + var(--space-2));
    display: none;
    flex-direction: column;
    align-items: stretch;
    min-width: 220px;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-card);
    box-shadow: var(--shadow-md);
  }

  .nav-list[data-open="true"] {
    display: flex;
  }

  .nav-link {
    width: 100%;
    border-radius: var(--radius-sm);
  }

  .grid-cols-2,
  .grid-cols-3 {
    grid-template-columns: 1fr;
  }

  .section {
    padding-block: var(--space-7);
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .hero-copy {
    text-align: center;
  }

  .hero-copy p {
    margin-inline: auto;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-media-frame {
    max-width: min(100%, 420px);
  }

  .hero-video-shell {
    aspect-ratio: 9 / 18.5;
  }

  .family-controls-teaser {
    padding: var(--space-5);
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - (var(--space-4) * 2), 1120px);
  }

  .page-main {
    padding-block: var(--space-5) var(--space-7);
  }

  .hero {
    padding-top: var(--space-3);
  }

  .brand-text {
    font-size: 0.95rem;
  }

  .footer-content {
    justify-content: center;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }

  .legal-top-nav {
    margin-bottom: var(--space-3);
  }

  .back-home-btn {
    width: 100%;
    justify-content: center;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}