/* ========================================
   Krista Reinking — AI Systems Builder
   Design System & Styles
   ======================================== */

:root {
  --bg: #0D0D0D;
  --bg-card: #1A1A1A;
  --bg-card-hover: #222222;
  --orange: #E8601C;
  --orange-light: #FF7A3D;
  --text: #E8E8E8;
  --text-muted: #999999;
  --text-dim: #666666;
  --white: #FFFFFF;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

/* ========================================
   Layout
   ======================================== */

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 6rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ========================================
   Typography
   ======================================== */

.section-label {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 1.5rem;
}

.section-headline {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 2.8rem;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 1.5rem;
}

.section-headline em {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-style: italic;
  color: var(--orange);
}

.section-body {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 680px;
}

/* ========================================
   Navigation
   ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: rgba(13, 13, 13, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(232, 96, 28, 0.15);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  font-size: 0.85rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--white);
}

.nav-cta {
  background: var(--orange);
  color: var(--white) !important;
  padding: 0.5rem 1.2rem;
  border-radius: 4px;
  font-weight: 600 !important;
  transition: background 0.2s ease, transform 0.2s ease !important;
}

.nav-cta:hover {
  background: var(--orange-light);
  transform: translateY(-1px);
  color: var(--white) !important;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(13, 13, 13, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(232, 96, 28, 0.15);
  padding: 1.5rem 2rem;
  z-index: 999;
}

.mobile-menu.active {
  display: block;
}

.mobile-menu a {
  display: block;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: color 0.2s ease;
}

.mobile-menu a:hover {
  color: var(--white);
}

.mobile-menu .nav-cta {
  display: inline-block;
  margin-top: 0.75rem;
  border-bottom: none;
}

/* ========================================
   Hero
   ======================================== */

.hero {
  min-height: 100vh;
  padding-top: 64px;
  display: flex;
  align-items: center;
  border-top: none;
}

.hero .container {
  max-width: 800px;
  width: 100%;
}

.hero-eyebrow {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 1.5rem;
}

.hero-headline {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 4rem;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.hero-headline em {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-style: italic;
  color: var(--orange);
  display: block;
}

.hero-subtext {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 2.5rem;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.btn-primary {
  display: inline-block;
  background: var(--orange);
  color: var(--white);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.85rem 2rem;
  border-radius: 4px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.btn-primary:hover {
  background: var(--orange-light);
  transform: translateY(-1px);
  color: var(--white);
}

.btn-secondary {
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.btn-secondary:hover {
  color: var(--white);
}

/* ========================================
   Problem Section
   ======================================== */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid rgba(232, 96, 28, 0.15);
  border-radius: 8px;
  padding: 2rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.card:hover {
  border-color: rgba(232, 96, 28, 0.4);
  background: var(--bg-card-hover);
}

.card-quote {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 1.1rem;
  color: var(--orange-light);
  margin-bottom: 1rem;
  line-height: 1.4;
}

.card-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.transition-line {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 1.2rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 3rem;
}

/* ========================================
   What I Build Section
   ======================================== */

.build-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  padding: 2.5rem 2rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.build-card:hover {
  border-color: rgba(232, 96, 28, 0.4);
  background: var(--bg-card-hover);
}

.build-card-icon {
  color: var(--orange);
  margin-bottom: 1.25rem;
}

.build-card-icon svg {
  width: 28px;
  height: 28px;
}

.build-card h3 {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.build-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========================================
   Proof Section
   ======================================== */

.proof-intro {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: 3rem;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
}

.metric {
  text-align: center;
  padding: 1.5rem 0.5rem;
}

.metric-number {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 2.2rem;
  color: var(--orange);
  margin-bottom: 0.5rem;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.proof-closing {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 1.3rem;
  color: var(--white);
  text-align: center;
  margin-top: 2rem;
}

/* ========================================
   Process Section
   ======================================== */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2.5rem;
}

.step {
  padding: 2rem;
}

.step-number {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 3rem;
  color: rgba(232, 96, 28, 0.2);
  margin-bottom: 1rem;
  line-height: 1;
}

.step h3 {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.step p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========================================
   Audience Section
   ======================================== */

.audience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2.5rem;
}

.audience-col-heading {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.audience-col-heading.for-you {
  color: var(--orange);
}

.audience-col-heading.not-for-you {
  color: var(--text-dim);
}

.audience-list {
  list-style: none;
}

.audience-list li {
  font-size: 0.95rem;
  color: var(--text-muted);
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.audience-list .check {
  color: var(--orange);
  font-weight: 700;
  flex-shrink: 0;
}

.audience-list .cross {
  color: var(--text-dim);
  font-weight: 700;
  flex-shrink: 0;
}

/* ========================================
   About Section
   ======================================== */

.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  align-items: start;
  margin-top: 2.5rem;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.about-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 2rem;
}

.about-links a {
  color: var(--orange);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.about-links a:hover {
  color: var(--orange-light);
}

.about-photo img {
  width: 100%;
  max-width: 280px;
  border-radius: 8px;
  border: 2px solid rgba(232, 96, 28, 0.2);
}

/* ========================================
   Connect / CTA Section
   ======================================== */

.connect {
  text-align: center;
  padding: 8rem 0;
}

.connect .section-headline {
  margin-left: auto;
  margin-right: auto;
}

.connect .section-body {
  max-width: 680px;
  margin: 0 auto 2.5rem auto;
  text-align: center;
}

.btn-primary-lg {
  display: inline-block;
  background: var(--orange);
  color: var(--white);
  font-family: 'Inter', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  padding: 1rem 2.5rem;
  border-radius: 4px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.btn-primary-lg:hover {
  background: var(--orange-light);
  transform: translateY(-1px);
  color: var(--white);
}

.connect-secondary {
  margin-top: 2rem;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.connect-secondary a {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.connect-secondary a:hover {
  color: var(--orange);
}

/* ========================================
   Footer
   ======================================== */

.footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ========================================
   Responsive — Tablet (≤900px)
   ======================================== */

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

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

  .hero-headline {
    font-size: 2.5rem;
  }

  .hero-subtext {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

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

  .section-headline {
    font-size: 2.2rem;
  }

  .cards-grid,
  .steps-grid {
    grid-template-columns: 1fr;
  }

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

  .audience-grid {
    grid-template-columns: 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-photo {
    display: flex;
    justify-content: center;
  }

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

  .build-cards-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Responsive — Mobile (≤600px)
   ======================================== */

@media (max-width: 600px) {
  section {
    padding: 4rem 0;
  }

  .container {
    padding: 0 1.5rem;
  }

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

  .section-headline {
    font-size: 1.8rem;
  }

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

  .connect {
    padding: 5rem 0;
  }

  .hero-ctas {
    flex-direction: column;
    gap: 0.75rem;
  }
}