/* ============================
     Main Styles
     ============================ */

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background-color: rgba(255, 251, 254, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--duration-medium) var(--ease-standard),
    box-shadow var(--duration-medium) var(--ease-standard);
}

.header.scrolled {
  box-shadow: var(--shadow-level-1);
  background-color: rgba(255, 251, 254, 0.98);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: var(--spacing-md) var(--container-padding);
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-headline-medium);
  line-height: var(--line-height-headline-medium);
  font-weight: 700;
  color: var(--color-primary-main);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.header-logo-icon {
  font-size: 32px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.header-nav a {
  font-size: var(--font-size-body-medium);
  line-height: var(--line-height-body-medium);
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--duration-short) var(--ease-standard),
    transform var(--duration-short) var(--ease-standard);
}

.header-nav a:hover {
  color: var(--color-primary-main);
  transform: translateY(-1px);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--color-primary-50) 0%,
    var(--color-secondary-50) 50%,
    var(--color-surface-container-low) 100%
  );
  padding: 120px var(--container-padding) var(--spacing-7xl);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    var(--color-primary-100) 0%,
    transparent 70%
  );
  opacity: 0.3;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -200px;
  left: -200px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    var(--color-secondary-100) 0%,
    transparent 70%
  );
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-icon {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-3xl);
  border-radius: 60px;
  background: linear-gradient(
    135deg,
    var(--color-primary-main),
    var(--color-primary-700)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-size: 64px;
  box-shadow: var(--shadow-level-3);
}

.hero-title {
  font-size: var(--font-size-display-medium);
  line-height: var(--line-height-display-medium);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: var(--font-size-headline-small);
  line-height: var(--line-height-headline-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-4xl);
  font-weight: 400;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

/* Features Section */
.features {
  background-color: var(--color-surface-default);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-3xl);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-4xl) var(--spacing-2xl);
  background-color: var(--color-surface-container-low);
  border-radius: var(--border-radius-lg);
  transition: transform var(--duration-medium) var(--ease-emphasized),
    box-shadow var(--duration-medium) var(--ease-emphasized);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-level-4);
}

.feature-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--spacing-xl);
  border-radius: var(--border-radius-xl);
  background: linear-gradient(
    135deg,
    var(--color-primary-100),
    var(--color-primary-50)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-main);
  font-size: 36px;
}

.feature-title {
  font-size: var(--font-size-title-large);
  line-height: var(--line-height-title-large);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.feature-description {
  font-size: var(--font-size-body-medium);
  line-height: var(--line-height-body-medium);
  color: var(--color-text-secondary);
}

/* Screenshots Section */
.screenshots {
  background-color: var(--color-surface-container-low);
}

.screenshots-placeholder {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-7xl);
  text-align: center;
}

.screenshots-placeholder h3 {
  font-size: var(--font-size-headline-medium);
  line-height: var(--line-height-headline-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
}

.screenshots-placeholder p {
  font-size: var(--font-size-body-large);
  line-height: var(--line-height-body-large);
  color: var(--color-text-secondary);
}

/* Design Section */
.design {
  background-color: var(--color-surface-default);
}

.design-content {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.design-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-4xl);
}

.design-item {
  padding: var(--spacing-3xl);
  background-color: var(--color-surface-container-low);
  border-radius: var(--border-radius-lg);
}

.design-item-icon {
  font-size: 40px;
  margin-bottom: var(--spacing-md);
}

.design-item-title {
  font-size: var(--font-size-title-large);
  line-height: var(--line-height-title-large);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.design-item-description {
  font-size: var(--font-size-body-medium);
  line-height: var(--line-height-body-medium);
  color: var(--color-text-secondary);
}

/* Contact Section */
.contact {
  background: linear-gradient(
    135deg,
    var(--color-primary-main),
    var(--color-primary-700)
  );
  color: var(--color-text-inverse);
}

.contact .section-title {
  color: var(--color-text-inverse);
}

.contact .section-subtitle {
  color: rgba(255, 255, 255, 0.8);
}

.contact-content {
  text-align: center;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-body-large);
  line-height: var(--line-height-body-large);
  color: var(--color-text-inverse);
  background-color: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-xl) var(--spacing-3xl);
  border-radius: var(--border-radius-full);
  transition: background-color var(--duration-short) var(--ease-standard),
    transform var(--duration-short) var(--ease-standard);
}

.contact-link:hover {
  background-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

/* Footer */
.footer {
  background-color: var(--color-surface-container-highest);
  padding: var(--spacing-4xl) 0 var(--spacing-2xl);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2xl);
}

.footer-nav {
  display: flex;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: var(--font-size-body-medium);
  line-height: var(--line-height-body-medium);
  color: var(--color-text-secondary);
  transition: color var(--duration-short) var(--ease-standard);
}

.footer-nav a:hover {
  color: var(--color-primary-main);
}

.footer-copyright {
  font-size: var(--font-size-body-small);
  line-height: var(--line-height-body-small);
  color: var(--color-text-tertiary);
}

/* Privacy & Terms Pages */
.privacy-header,
.terms-header {
  padding: 120px var(--container-padding) var(--spacing-5xl);
  background: linear-gradient(
    135deg,
    var(--color-primary-50),
    var(--color-surface-container-low)
  );
  text-align: center;
}

.privacy-header h1,
.terms-header h1 {
  font-size: var(--font-size-headline-large);
  line-height: var(--line-height-headline-large);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.privacy-header p,
.terms-header p {
  font-size: var(--font-size-body-large);
  line-height: var(--line-height-body-large);
  color: var(--color-text-secondary);
}

.privacy-content,
.terms-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-5xl) var(--container-padding);
}

.privacy-placeholder,
.terms-placeholder {
  text-align: center;
  padding: var(--spacing-7xl);
  background-color: var(--color-surface-container-low);
  border-radius: var(--border-radius-lg);
}

.privacy-placeholder h2,
.terms-placeholder h2 {
  font-size: var(--font-size-headline-medium);
  line-height: var(--line-height-headline-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.privacy-placeholder p,
.terms-placeholder p {
  font-size: var(--font-size-body-large);
  line-height: var(--line-height-body-large);
  color: var(--color-text-secondary);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-primary);
}

.mobile-menu {
  display: none;
}

/* Responsive Styles */
@media (max-width: var(--breakpoint-tablet)) {
  .header-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
  }

  .hero-title {
    font-size: var(--font-size-headline-large);
    line-height: var(--line-height-headline-large);
  }

  .hero-subtitle {
    font-size: var(--font-size-title-large);
    line-height: var(--line-height-title-large);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
  }

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

  .hero-icon {
    width: 96px;
    height: 96px;
    font-size: 48px;
  }
}

@media (max-width: var(--breakpoint-mobile)) {
  .hero {
    padding: 100px var(--spacing-lg) var(--spacing-5xl);
  }

  .hero-title {
    font-size: var(--font-size-headline-medium);
    line-height: var(--line-height-headline-medium);
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

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

  .feature-card {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }

  .section {
    padding: var(--spacing-5xl) 0;
  }

  .header-inner {
    padding: var(--spacing-sm) var(--spacing-lg);
  }

  .header-logo {
    font-size: var(--font-size-title-large);
    line-height: var(--line-height-title-large);
  }

  .header-logo-icon {
    font-size: 24px;
  }
}