/* ─── Design Tokens ─── */
:root {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-primary: #4f46e5;
  --color-primary-light: #eef2ff;
  --color-primary-dark: #3730a3;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-error: #ef4444;
  --radius: 1rem;
  --radius-sm: 0.5rem;
  --spacing: 1rem;
  --section-padding: 4rem 1.5rem;
  --max-width: 1100px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

/* ─── Animations ─── */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* TODO: Replace with Rive avatar component (Issue #10) */
.sherpa-avatar {
  font-size: 5rem;
  display: block;
  text-align: center;
  animation: float 3s ease-in-out infinite, pulse 2s ease-in-out infinite;
}

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

/* ─── Utility ─── */
.section__title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.section__subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
  font-size: 1.1rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
  text-decoration: none;
}

.btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

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

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

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

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

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

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

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

/* ─── Navigation ─── */
.nav {
  position: sticky;
  top: 0;
  background: var(--color-surface);
  border-bottom: 1px solid #e5e7eb;
  z-index: 100;
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.nav__logo-icon {
  font-size: 1.4rem;
}

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

.nav__links a {
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav__links a:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
}

.nav__toggle:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

/* Mobile nav drawer */
.nav__drawer {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--color-surface);
  border-top: 1px solid #e5e7eb;
  padding: 1rem 1.5rem;
}

.nav__drawer.open {
  display: flex;
}

.nav__drawer a {
  padding: 0.75rem 0;
  color: var(--color-text);
  font-weight: 500;
  border-bottom: 1px solid #f3f4f6;
  display: block;
}

.nav__drawer a:last-child {
  border-bottom: none;
}

.nav__drawer-cta {
  margin-top: 0.75rem;
  text-align: center;
  justify-content: center;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }

  .nav__toggle {
    display: none;
  }

  .nav__drawer {
    display: none !important;
  }
}

/* ─── Hero Section ─── */
.hero {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-surface) 60%);
  padding: 4rem 1.5rem 5rem;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
}

.hero__text {
  text-align: center;
}

.hero__text h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

.hero__sub {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto 2rem;
}

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

.hero__avatar-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.hero__avatar-hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .hero {
    padding: 6rem 1.5rem 7rem;
    min-height: 80vh;
    display: flex;
    align-items: center;
  }

  .hero__inner {
    flex-direction: row;
    align-items: center;
    text-align: left;
  }

  .hero__text {
    flex: 1;
    text-align: left;
  }

  .hero__text h1 {
    font-size: 3.25rem;
  }

  .hero__sub {
    margin-left: 0;
  }

  .hero__ctas {
    justify-content: flex-start;
  }

  .hero__avatar-wrap {
    flex: 0 0 340px;
  }

  .sherpa-avatar {
    font-size: 8rem;
  }
}

/* ─── How It Works ─── */
.how-it-works {
  background: var(--color-surface);
  padding: var(--section-padding);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.step {
  position: relative;
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  flex: 1;
}

.step__number {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-primary);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  margin: 0 auto 1rem;
}

.step__icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  display: block;
}

.step__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

@media (min-width: 768px) {
  .steps {
    flex-direction: row;
    align-items: stretch;
    gap: 0;
  }

  .step {
    border-radius: 0;
  }

  .step:first-child {
    border-radius: var(--radius) 0 0 var(--radius);
  }

  .step:last-child {
    border-radius: 0 var(--radius) var(--radius) 0;
  }

  .step:not(:last-child)::after {
    content: '→';
    position: absolute;
    right: -0.85rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--color-primary);
    z-index: 1;
  }
}

/* ─── Features ─── */
.features {
  background: var(--color-bg);
  padding: var(--section-padding);
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.feature-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.feature-card__icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.feature-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-card__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

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

/* ─── Personas ─── */
.personas {
  background: var(--color-surface);
  padding: var(--section-padding);
}

.personas__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.persona-card {
  background: var(--color-primary-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  border-left: 4px solid var(--color-primary);
}

.persona-card__icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
  display: block;
}

.persona-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.persona-card__desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

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

/* ─── Pricing ─── */
.pricing {
  background: var(--color-bg);
  padding: var(--section-padding);
}

.pricing__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 780px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 2px solid #e5e7eb;
  overflow: hidden;
}

.pricing-card--pro {
  border-color: var(--color-primary);
}

.pricing-card__header {
  padding: 2rem 2rem 1.5rem;
  border-bottom: 1px solid #f3f4f6;
}

.pricing-card--pro .pricing-card__header {
  background: var(--color-primary-light);
  border-bottom-color: #ddd6fe;
}

.pricing-card__badge {
  display: inline-block;
  background: var(--color-primary);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.pricing-card__tier {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.pricing-card__price {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 0.25rem;
}

.pricing-card__amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text);
}

.pricing-card__period {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.pricing-card__tagline {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.pricing-card__body {
  padding: 1.75rem 2rem 2rem;
}

.pricing-card__features {
  list-style: none;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pricing-card__features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--color-text);
}

.pricing-card__features .feature-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

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

/* ─── CTA Banner ─── */
.cta-banner {
  background: var(--color-primary);
  color: #ffffff;
  padding: 5rem 1.5rem;
  text-align: center;
}

.cta-banner__title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: #ffffff;
}

.cta-banner__sub {
  font-size: 1.1rem;
  opacity: 0.85;
  margin-bottom: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ─── Footer ─── */
footer {
  background: var(--color-text);
  color: #9ca3af;
  padding: 2.5rem 1.5rem;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}

.footer__logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  list-style: none;
  justify-content: center;
}

.footer__links a {
  color: #9ca3af;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer__links a:hover {
  color: #ffffff;
}

.footer__links a:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 3px;
  border-radius: 2px;
}

.footer__copy {
  font-size: 0.85rem;
  color: #6b7280;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer__links {
    justify-content: flex-start;
  }
}