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

:root {
  /* Warm Craftsman Palette */
  --color-bg-primary: #f5f0e8;
  --color-bg-secondary: #ebe4d6;
  --color-text: #3d3428;
  --color-text-secondary: #7a6b55;
  --color-accent: #c4a265;
  --color-dark: #3d3428;
  --color-white: #fff;

  /* Typography */
  --font-heading: Georgia, 'Times New Roman', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --section-padding: 5rem 1.5rem;
  --container-max: 960px;
  --nav-height: 64px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.35rem; }

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

/* === Accent Divider === */
.accent-divider {
  width: 50px;
  height: 3px;
  background: var(--color-accent);
  border: none;
  margin: 1rem 0;
}

.accent-divider--center {
  margin-left: auto;
  margin-right: auto;
}

/* === Nav === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-bg-secondary);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav__wordmark {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-text);
  text-decoration: none;
}

.nav__wordmark:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav__links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s;
}

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

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

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: transform 0.2s, opacity 0.2s;
}

/* === Hero === */
.hero {
  padding: 6rem 1.5rem;
  text-align: center;
  background: var(--color-bg-secondary);
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 2rem;
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: 4px;
  font-size: 0.95rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  text-decoration: none;
  border: none;
}

.btn:hover {
  text-decoration: none;
}

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

.btn--primary:hover {
  background: #b3923a;
}

.btn--outline {
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn--outline:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

/* === Sections === */
.section {
  padding: var(--section-padding);
}

.section--alt {
  background: var(--color-bg-secondary);
}

.section__header {
  text-align: center;
  margin-bottom: 3rem;
}

.section__header p {
  color: var(--color-text-secondary);
  margin-top: 0.75rem;
  font-size: 1.05rem;
}

/* === Card Grid === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
  max-width: var(--container-max);
  margin: 0 auto;
}

.card {
  background: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(61, 52, 40, 0.08);
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(61, 52, 40, 0.14);
  transform: translateY(-2px);
}

.card__body {
  padding: 1.5rem;
}

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

.card__body p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* === Status Badge === */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.badge--seeking {
  background: #fdf3e1;
  color: #a07d2e;
}

.badge--licensed {
  background: #e6f0e6;
  color: #3d6b3d;
}

/* === About === */
.about {
  display: flex;
  gap: 3rem;
  align-items: center;
  max-width: var(--container-max);
  margin: 0 auto;
}

.about__photo {
  flex-shrink: 0;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  object-fit: cover;
  object-position: center 20%;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

.about__text h2 {
  margin-bottom: 0.5rem;
}

.about__text p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

/* === Footer === */
.footer {
  background: var(--color-dark);
  color: var(--color-bg-secondary);
  padding: 3rem 1.5rem;
}

.footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
}

.footer h3 {
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.footer p,
.footer a {
  color: var(--color-bg-secondary);
  font-size: 0.9rem;
}

.footer a:hover {
  color: var(--color-accent);
}

.footer__copy {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(196, 162, 101, 0.2);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* === Invention Detail Page === */
.invention-hero {
  padding: 4rem 1.5rem;
  text-align: center;
  background: var(--color-bg-secondary);
}

.invention-hero h1 {
  margin-bottom: 0.75rem;
}

.invention-hero p {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 1.25rem;
}

.story-section {
  padding: var(--section-padding);
  max-width: 720px;
  margin: 0 auto;
}

.story-section h2 {
  margin-bottom: 0.5rem;
}

.story-section p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.diagram-placeholder {
  max-width: 600px;
  margin: 2rem auto;
  padding: 4rem 2rem;
  background: var(--color-bg-secondary);
  border: 2px dashed var(--color-accent);
  border-radius: 8px;
  text-align: center;
  color: var(--color-text-secondary);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
  max-width: var(--container-max);
  margin: 2rem auto 0;
}

.benefit-card {
  background: var(--color-white);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 8px rgba(61, 52, 40, 0.08);
}

.benefit-card__icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.benefit-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.benefit-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.cta-section {
  text-align: center;
  padding: var(--section-padding);
  background: var(--color-bg-secondary);
}

.cta-section h2 {
  margin-bottom: 0.5rem;
}

.cta-section p {
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

/* === Responsive === */
@media (max-width: 768px) {
  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.5rem; }

  .hero {
    padding: 4rem 1.5rem;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-bg-secondary);
  }

  .nav__links--open {
    display: flex;
  }

  .nav__toggle {
    display: block;
  }

  .about {
    flex-direction: column;
    text-align: center;
  }

  .footer__inner {
    flex-direction: column;
  }

  .section {
    padding: 3rem 1.5rem;
  }

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

@media (max-width: 480px) {
  .benefits-grid {
    grid-template-columns: 1fr;
  }
}