/* ============================================
   AIFDS — AI Feed Discovery Standard
   Single CSS file — mobile-first responsive
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #D4563A;
  --color-primary-light: #E8795F;
  --color-primary-dark: #B8432A;
  --color-beige: #F5EDE4;
  --color-beige-dark: #E8DDD1;
  --color-white: #FAF8F6;
  --color-white-pure: #FFFFFF;
  --color-text: #2D2A26;
  --color-text-light: #6B6560;
  --color-text-muted: #9B9490;
  --color-border: #E0D8D0;
  --color-code-bg: #2D2A26;
  --color-code-text: #F5EDE4;

  --font-body: 'Inter', sans-serif;
  --font-heading: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --max-width: 1120px;
  --radius: 8px;
  --radius-lg: 12px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
  margin-bottom: 1rem;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section {
  padding: 4rem 0;
}

.section--beige {
  background-color: var(--color-beige);
}

.section--white {
  background-color: var(--color-white-pure);
}

/* --- Header / Nav --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header__logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--color-text);
  letter-spacing: -0.5px;
}

.header__logo span {
  color: var(--color-primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav__link {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-light);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav__link:hover {
  color: var(--color-text);
  background-color: var(--color-beige);
}

.nav__link--cta {
  color: var(--color-white);
  background-color: var(--color-primary);
  font-weight: 600;
  margin-left: 0.5rem;
}

.nav__link--cta:hover {
  color: var(--color-white);
  background-color: var(--color-primary-dark);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* --- Hero --- */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
}

.hero__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-primary);
  background-color: rgba(212, 86, 58, 0.08);
  padding: 0.35rem 0.9rem;
  border-radius: 50px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.3px;
}

.hero h1 {
  font-size: 2.75rem;
  max-width: 720px;
  margin: 0 auto 1.25rem;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: var(--color-text-light);
  max-width: 580px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

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

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

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

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

.btn--secondary:hover {
  background-color: var(--color-beige-dark);
  color: var(--color-text);
}

.hero__actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* --- Industry Cards --- */
.industries-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.industry-card {
  background-color: var(--color-white-pure);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.industry-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: 0 4px 16px rgba(212, 86, 58, 0.06);
}

.industry-card h3 {
  margin-bottom: 0.5rem;
}

.industry-card p {
  color: var(--color-text-light);
  font-size: 0.925rem;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.industry-card__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.industry-card__link:hover {
  color: var(--color-primary-dark);
}

/* Generic blueprint card — dashed border, beige tint */
.industry-card--generic {
  background-color: var(--color-beige);
  border-style: dashed;
  border-color: var(--color-beige-dark);
}

.industry-card--generic:hover {
  border-color: var(--color-primary-light);
  background-color: var(--color-beige);
}

/* --- Family Overview Cards --- */
.family-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 2rem;
}

.family-card {
  background-color: var(--color-white-pure);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
}

.family-card h3 {
  margin-bottom: 0.5rem;
}

.family-card p {
  color: var(--color-text-light);
  font-size: 0.925rem;
  line-height: 1.6;
  margin-bottom: 0;
}

/* --- Blueprint Pills --- */
.blueprint-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
  letter-spacing: 0.3px;
  margin-bottom: 0.75rem;
}

.blueprint-pill--org {
  color: var(--color-primary);
  background-color: rgba(212, 86, 58, 0.08);
}

.blueprint-pill--software {
  color: #2D6FBA;
  background-color: rgba(45, 111, 186, 0.08);
}

.blueprint-pill--ecommerce {
  color: #2E7D5B;
  background-color: rgba(46, 125, 91, 0.08);
}

.blueprint-pill--publishing {
  color: #5B4FC7;
  background-color: rgba(91, 79, 199, 0.08);
}

.blueprint-pills {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.blueprint-pills .blueprint-pill {
  margin-bottom: 0;
}

.blueprint-pill-sep {
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

/* --- How It Works --- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
}

.step {
  text-align: center;
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.step h3 {
  margin-bottom: 0.5rem;
}

.step p {
  color: var(--color-text-light);
  font-size: 0.925rem;
}

/* --- Stats Grid --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  max-width: 640px;
  margin: 2.5rem auto 0;
}

.stat-card {
  text-align: center;
  padding: 1.75rem 1rem;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
}

.stat-card__number {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stat-card__label {
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-weight: 500;
}

/* --- Code Block --- */
.code-block {
  position: relative;
  background-color: var(--color-code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 1.5rem 0;
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background-color: rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-block__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.code-block__copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-beige);
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.code-block__copy:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.code-block__copy--copied {
  color: #6BCB77;
  border-color: #6BCB77;
}

.code-block pre {
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  line-height: 1.7;
  color: var(--color-code-text);
}

/* --- CTA Banner --- */
.cta-banner {
  text-align: center;
  padding: 3.5rem 1.5rem;
  background-color: var(--color-beige);
  border-radius: var(--radius-lg);
}

.cta-banner h2 {
  margin-bottom: 0.75rem;
}

.cta-banner p {
  color: var(--color-text-light);
  max-width: 480px;
  margin: 0 auto 1.5rem;
}

/* --- Footer --- */
.footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer__brand {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.footer__brand span {
  color: var(--color-primary);
}

.footer__desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  max-width: 320px;
  line-height: 1.6;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer__col h4 {
  font-size: 0.825rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.footer__col ul {
  list-style: none;
}

.footer__col li {
  margin-bottom: 0.4rem;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.footer__col a {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

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

.footer__bottom {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* --- Field Reference --- */
.field-reference { margin-top: 1rem; }
.field-reference dt {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}
.field-reference dd {
  color: var(--color-text-light);
  font-size: 0.925rem;
  line-height: 1.7;
  margin-left: 0;
  padding-bottom: 0.75rem;
}
.field-conditional {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  color: #2D6FBA;
  background-color: rgba(45, 111, 186, 0.08);
  padding: 0.1rem 0.45rem;
  border-radius: 50px;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.field-note {
  display: block;
  font-style: italic;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}
.field-citation {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 1.5rem;
}
.field-citation a {
  color: var(--color-primary);
  text-decoration: underline;
}

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

.faq-question {
  display: block;
  padding: 1rem 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  list-style: none;
  color: var(--color-text);
  transition: color 0.2s ease;
}

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

.faq-question::after {
  content: '+';
  float: right;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: transform 0.2s ease;
}

details[open] .faq-question::after {
  content: '−';
  color: var(--color-primary);
}

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

.faq-answer {
  padding: 0 0 1rem;
  color: var(--color-text-light);
  font-size: 0.925rem;
  line-height: 1.7;
  margin-bottom: 0;
}

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

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

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 768px) {
  h1 { font-size: 2.5rem; }
  .hero h1 { font-size: 3.25rem; }
}

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

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

/* Mobile nav */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.25rem;
    gap: 0.25rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  }

  .nav--open {
    display: flex;
  }

  .nav__link {
    padding: 0.6rem 0.75rem;
    width: 100%;
  }

  .nav__link--cta {
    text-align: center;
    margin-left: 0;
    margin-top: 0.5rem;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 3rem 0;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }
}