/* EchoFlow Labs — static site styles. See design-system/MASTER.md */

:root {
  --color-navy-950: #0b1220;
  --color-navy-900: #111827;
  --color-navy-800: #1e293b;
  --color-indigo-700: #4338ca;
  --color-indigo-600: #4f46e5;
  --color-sky-500: #0ea5e9;
  --color-sky-400: #38bdf8;
  --color-mint-400: #5eead4;
  --color-mint-300: #99f6e4;
  --color-warm-500: #d97706;
  --color-warm-400: #f59e0b;
  --color-surface: #f8fafc;
  --color-surface-elevated: #ffffff;
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-border: #e2e8f0;
  /* Semantic contrast tokens (WCAG text ≥4.5:1, focus ≥3:1 on surfaces) */
  --link: #3730a3;
  --link-hover: #1e3a8a;
  --text-accent: #0369a1;
  --icon-accent: #0369a1;
  --focus-ring: #1d4ed8;
  --status-warm-text: #92400e;
  --anchor-scroll-margin: 5.5rem;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.06);
  --shadow-md: 0 4px 24px rgb(15 23 42 / 0.08);
  --max-width: 72rem;
  --header-height: 4rem;
  --transition: 180ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-surface: #0b1220;
    --color-surface-elevated: #111827;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #1e293b;
    --link: #a5b4fc;
    --link-hover: #c7d2fe;
    --text-accent: #7dd3fc;
    --icon-accent: #7dd3fc;
    --focus-ring: #60a5fa;
    --status-warm-text: #fcd34d;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 24px rgb(0 0 0 / 0.35);
  }
}

@media (max-width: 700px) {
  :root {
    --anchor-scroll-margin: 10.5rem;
  }
}

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

html {
  scroll-behavior: smooth;
}

@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;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-surface);
  overflow-x: hidden;
}

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

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--link-hover);
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

section[id] {
  scroll-margin-top: var(--anchor-scroll-margin);
}

.skip-link {
  position: absolute;
  left: var(--space-md);
  top: -100%;
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-elevated);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  font-weight: 600;
}

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

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--header-height);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 650;
  font-size: 1.05rem;
  color: var(--color-text);
  text-decoration: none;
  min-height: 44px;
  max-width: 100%;
}

.brand__name {
  white-space: nowrap;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-xs) var(--space-md);
}

.nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 var(--space-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

@media (max-width: 700px) {
  .site-header {
    padding-block: var(--space-sm);
  }

  .site-header__inner {
    flex-direction: column;
    align-items: stretch;
    min-height: 0;
    gap: var(--space-sm);
  }

  .brand {
    align-self: flex-start;
    font-size: 0.9875rem;
  }

  .nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
    gap: var(--space-xs);
    justify-content: stretch;
  }

  .nav a {
    width: 100%;
    min-height: 44px;
    padding: var(--space-sm) var(--space-xs);
    font-size: 0.8125rem;
    line-height: 1.25;
    text-align: center;
  }
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-indigo-600) 8%, transparent);
}

.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.hero__grid {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
}

@media (min-width: 768px) {
  .hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-accent);
  margin-bottom: var(--space-md);
}

.hero h1 {
  font-size: clamp(2rem, 4vw + 1rem, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-lg);
  font-weight: 700;
}

.hero__lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 38ch;
  margin: 0 0 var(--space-xl);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 44px;
  min-width: 44px;
  padding: 0 var(--space-lg);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn--primary {
  background: var(--color-indigo-600);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-indigo-700);
  color: #fff;
}

.btn--secondary {
  background: var(--color-surface-elevated);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-sky-400);
  color: var(--color-text);
}

.hero__visual {
  position: relative;
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  background: linear-gradient(145deg, color-mix(in srgb, var(--color-indigo-600) 12%, var(--color-surface-elevated)), var(--color-surface-elevated));
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

.hero__visual-inner {
  display: grid;
  gap: var(--space-md);
}

.flow-card {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.flow-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.flow-card p {
  margin: 0;
  font-size: 0.9375rem;
}

.section {
  padding: var(--space-3xl) 0;
}

.section--alt {
  background: color-mix(in srgb, var(--color-indigo-600) 4%, var(--color-surface));
  border-block: 1px solid var(--color-border);
}

.section__header {
  max-width: 42rem;
  margin-bottom: var(--space-2xl);
}

.section h2 {
  font-size: clamp(1.5rem, 2vw + 1rem, 2.125rem);
  line-height: 1.2;
  margin: 0 0 var(--space-md);
  letter-spacing: -0.02em;
}

.section__lead {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

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

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

.card {
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.card__icon {
  width: 44px;
  height: 44px;
  color: var(--color-indigo-600);
}

.card h3 {
  margin: 0;
  font-size: 1.375rem;
}

.card p {
  margin: 0;
  color: var(--color-text-muted);
  flex: 1;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  background: color-mix(in srgb, var(--color-mint-400) 25%, var(--color-surface));
  color: var(--color-navy-800);
  border: 1px solid color-mix(in srgb, var(--color-mint-400) 50%, var(--color-border));
}

@media (prefers-color-scheme: dark) {
  .badge {
    color: var(--color-mint-300);
    background: color-mix(in srgb, var(--color-mint-400) 15%, var(--color-navy-900));
  }
}

.badge--muted {
  background: color-mix(in srgb, var(--color-warm-400) 18%, var(--color-surface));
  border-color: color-mix(in srgb, var(--color-warm-400) 35%, var(--color-border));
  color: var(--status-warm-text);
}

.product-detail {
  display: grid;
  gap: var(--space-2xl);
}

@media (min-width: 1024px) {
  .product-detail {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.feature-list {
  margin: var(--space-lg) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-md);
}

.feature-list li {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.feature-list svg {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.2rem;
  color: var(--icon-accent);
}

.screenshot-pair {
  display: grid;
  gap: var(--space-lg);
}

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

.phone-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-navy-950);
  box-shadow: var(--shadow-md);
}

.phone-frame picture,
.phone-frame img {
  width: 100%;
}

.callout {
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--color-warm-400) 35%, var(--color-border));
  background: color-mix(in srgb, var(--color-warm-400) 8%, var(--color-surface-elevated));
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.callout strong {
  color: var(--color-text);
}

.callout--spaced {
  margin-top: var(--space-lg);
}

.link-follow {
  margin-top: var(--space-lg);
}

.listening-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--color-navy-900), var(--color-navy-800));
  border: 1px solid var(--color-border);
}

.listening-visual svg {
  width: min(100%, 280px);
  color: var(--color-mint-400);
}

.wave-bar {
  transform-origin: center bottom;
  animation: wave 1.4s ease-in-out infinite;
}

.wave-bar:nth-child(2) { animation-delay: 0.15s; }
.wave-bar:nth-child(3) { animation-delay: 0.3s; }
.wave-bar:nth-child(4) { animation-delay: 0.45s; }
.wave-bar:nth-child(5) { animation-delay: 0.6s; }

@keyframes wave {
  0%, 100% { transform: scaleY(0.45); opacity: 0.7; }
  50% { transform: scaleY(1); opacity: 1; }
}

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

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

.principle {
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-elevated);
}

.principle h3 {
  margin: 0 0 var(--space-sm);
  font-size: 1.3125rem;
  line-height: 1.3;
  color: var(--color-text);
}

.principle p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.site-footer {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-elevated);
}

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

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

.footer__brand p {
  margin: var(--space-sm) 0 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  max-width: 32ch;
}

.footer__nav h2 {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-md);
}

.footer__nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-sm);
}

.footer__nav a {
  text-decoration: none;
  color: var(--color-text);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.footer__meta {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.page-header {
  padding: var(--space-2xl) 0 var(--space-lg);
}

.page-header h1 {
  margin: 0 0 var(--space-md);
  font-size: clamp(1.75rem, 3vw + 1rem, 2.5rem);
  letter-spacing: -0.02em;
}

.page-header p {
  margin: 0;
  color: var(--color-text-muted);
  max-width: 50ch;
}

.prose {
  max-width: 42rem;
  padding-bottom: var(--space-3xl);
}

.prose h2 {
  font-size: 1.625rem;
  line-height: 1.3;
  margin: var(--space-2xl) 0 var(--space-md);
  color: var(--color-text);
}

.prose h3 {
  font-size: 1.25rem;
  line-height: 1.35;
  margin: var(--space-xl) 0 var(--space-sm);
  color: var(--color-text);
}

.prose p,
.prose li {
  color: var(--color-text-muted);
}

.prose ul,
.prose ol {
  padding-left: 1.25rem;
}

.prose a {
  font-weight: 500;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-indigo-600) 8%, var(--color-surface));
}

.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  padding: var(--space-3xl) 0;
}

.error-page h1 {
  font-size: 4rem;
  margin: 0;
  line-height: 1;
  color: var(--text-accent);
}