/* ================================
   1. Custom Properties
   ================================ */

:root {
  --color-bg: #FFFFFF;
  --color-surface: #FAF7F2;
  --color-text: #333333;
  --color-text-mid: #555555;
  --color-text-light: #999999;
  --color-border: #e0e0e0;
  --color-accent: #aa0000;
  --color-accent-hover: #880000;
  --color-accent-light: #fff5f5;

  --font-body: 'Ubuntu', sans-serif;
  --font-heading: 'Raleway', sans-serif;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --container-max: 1120px;
  --container-pad: 1.5rem;

  --transition: 200ms ease;
}

/* ================================
   2. Typography
   ================================ */

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 200;
  line-height: 1.2;
}

h1 {
  font-size: 1.75rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.25rem;
}

p {
  color: var(--color-text-mid);
}

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

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

/* ================================
   3. Layout
   ================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page-wrapper > main {
  flex: 1;
}

/* ================================
   4. Header & Navigation
   ================================ */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding-block: var(--space-md);
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo-img {
  height: 28px;
  width: auto;
}

.nav-toggle {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-links {
  display: none;
  flex-direction: column;
  width: 100%;
  list-style: none;
  gap: var(--space-xs);
  padding-top: var(--space-md);
}

.nav-links--open {
  display: flex;
}

.nav-links a:not(.btn) {
  display: block;
  padding: var(--space-sm) 0;
  color: var(--color-text-mid);
  font-weight: 500;
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color var(--transition);
}

.nav-links a:not(.btn):hover,
.nav-links a:not(.btn)[aria-current="page"] {
  color: var(--color-accent);
}

/* ================================
   5. Hero
   ================================ */

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

.hero h1 {
  max-width: 600px;
  margin-bottom: var(--space-md);
}

.hero p {
  max-width: 520px;
  font-size: 1.125rem;
  margin-bottom: var(--space-lg);
}

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

/* ================================
   6. Sections
   ================================ */

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

.section-header {
  margin-bottom: var(--space-lg);
}

.page-header {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.page-header p {
  margin-top: var(--space-sm);
  font-size: 1.125rem;
}

/* About page */
.about-intro {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.about-photo img {
  width: 200px;
  border-radius: 8px;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

.about-content {
  max-width: 720px;
}

.about-content h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content p {
  margin-bottom: var(--space-md);
}

/* Product feature sections */
.product-feature {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.product-feature:last-of-type {
  border-bottom: none;
}

.product-feature h2 {
  font-size: 1.75rem;
  margin-bottom: var(--space-sm);
}

.product-lead {
  max-width: 640px;
  font-size: 1.0625rem;
  margin-bottom: var(--space-md);
}

.product-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
}

.feature-list {
  list-style: none;
  max-width: 480px;
}

.feature-list li {
  padding: var(--space-sm) 0;
  color: var(--color-text-mid);
  border-bottom: 1px solid var(--color-border);
}

.feature-list li:last-child {
  border-bottom: none;
}

.feature-list li::before {
  content: "\2713";
  color: var(--color-accent);
  font-weight: 600;
  margin-right: var(--space-sm);
}

/* Client work section */
.client-work {
  padding: var(--space-xl) 0;
}

.client-work h2 {
  margin-bottom: var(--space-lg);
}

/* Contact */
.contact-layout {
  display: grid;
  gap: var(--space-xl);
}

.contact-info h2 {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

.contact-info p {
  margin-bottom: var(--space-lg);
}

.contact-info a {
  font-size: 1.125rem;
}

.social-links {
  list-style: none;
  display: flex;
  gap: var(--space-md);
}

/* ================================
   7. Cards
   ================================ */

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-lg);
  transition: box-shadow var(--transition);
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card-icon {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card p {
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
}

.card a {
  font-weight: 500;
  font-size: 0.9375rem;
}

/* ================================
   8. Buttons
   ================================ */

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #FFFFFF;
}

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

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* ================================
   9. Forms
   ================================ */

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 480px;
}

.contact-form label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text);
  margin-top: var(--space-sm);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.contact-form button {
  margin-top: var(--space-md);
  align-self: flex-start;
}

/* ================================
   10. Footer
   ================================ */

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

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

.footer-inner p {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.footer-links {
  list-style: none;
  display: flex;
  gap: var(--space-md);
}

.footer-links a {
  color: var(--color-text-light);
  font-size: 0.875rem;
  text-decoration: none;
}

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

/* ================================
   11. Media Queries
   ================================ */

@media (min-width: 768px) {
  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .nav-toggle {
    display: none;
  }

  .nav-links {
    display: flex;
    flex-direction: row;
    width: auto;
    padding-top: 0;
    gap: var(--space-lg);
    align-items: center;
  }

  .about-intro {
    flex-direction: row;
    align-items: flex-start;
  }

  .about-photo img {
    width: 280px;
    position: sticky;
    top: calc(var(--space-xl) + 60px);
  }

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

  .contact-layout {
    grid-template-columns: 1fr 1fr;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

@media (min-width: 1024px) {
  :root {
    --container-pad: 2rem;
  }

  h1 {
    font-size: 2.5rem;
  }

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