/* =========================================================================
   Sana Landing Page — CSS sin frameworks
   Amethyst Wellness Theme
   ========================================================================= */

:root {
  /* Colors */
  --color-primary: #5e3bdb;
  --color-primary-container: #7858f5;
  --color-on-primary: #ffffff;
  --color-surface: #fdf7ff;
  --color-surface-container: #f2ebfb;
  --color-surface-container-high: #ede5f5;
  --color-on-surface: #1d1a25;
  --color-on-surface-variant: #484555;
  --color-secondary-container: #e9def5;
  --color-tertiary: #6d4d90;
  --color-outline-variant: #c9c4d7;

  /* Typography */
  --font-display: "Manrope", sans-serif;
  --font-body: "Be Vietnam Pro", sans-serif;

  /* Spacing (8px base unit) */
  --spacing-base: 8px;
  --spacing-sm: 4px;
  --spacing-md: 12px;
  --spacing-lg: 24px;
  --spacing-container: 20px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-surface);
  color: var(--color-on-surface);
  line-height: 1.6;
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: 40px;
  line-height: 48px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 32px;
  line-height: 40px;
}

h3 {
  font-size: 24px;
  line-height: 32px;
}

p {
  color: var(--color-on-surface-variant);
  line-height: 1.6;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* =========================================================================
   Layout & Components
   ========================================================================= */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-container);
}

@media (min-width: 1024px) {
  .container {
    padding: 0 48px;
  }
}

/* Header */
header {
  background-color: var(--color-surface);
  padding: var(--spacing-lg) var(--spacing-container);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-outline-variant);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-icon {
  font-size: 28px;
  line-height: 1;
}

.nav-links {
  display: none;
  list-style: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    gap: var(--spacing-lg);
  }
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

.cta-header {
  padding: 8px 16px;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.cta-header:hover {
  background-color: var(--color-primary-container);
}

/* Hero Section */
.hero {
  padding: 60px var(--spacing-container) 80px;
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  color: var(--color-on-surface);
}

.hero .subtitle {
  font-size: 18px;
  line-height: 28px;
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero .cta-button {
  display: inline-block;
  padding: 16px 32px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-container));
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-full);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 8px 24px rgba(94, 59, 219, 0.2);
}

.hero .cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(94, 59, 219, 0.3);
}

.hero .cta-button:active {
  transform: translateY(0);
}

/* Values Section */
.values {
  padding: 80px var(--spacing-container);
  background-color: var(--color-surface-container);
}

.values h2 {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-on-surface);
}

.values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: 1000px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .values-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.value-card {
  padding: var(--spacing-lg);
  background-color: var(--color-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: box-shadow 0.2s;
}

.value-card:hover {
  box-shadow: 0 4px 12px rgba(94, 59, 219, 0.1);
}

.value-icon {
  font-size: 40px;
  margin-bottom: var(--spacing-md);
  line-height: 1;
}

.value-card h3 {
  color: var(--color-on-surface);
  margin-bottom: var(--spacing-md);
}

.value-card p {
  font-size: 14px;
  line-height: 20px;
}

/* Installation Section */
.installation {
  padding: 80px var(--spacing-container);
}

.installation h2 {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-on-surface);
}

.installation-content {
  max-width: 800px;
  margin: 0 auto;
}

.os-toggle {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.os-toggle button {
  padding: 8px 16px;
  border: 2px solid var(--color-outline-variant);
  background-color: transparent;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--color-on-surface);
}

.os-toggle button.active {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

.install-steps {
  background-color: var(--color-surface-container);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-outline-variant);
}

.install-steps ol {
  list-style: decimal;
  padding-left: 20px;
}

.install-steps li {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.install-steps strong {
  color: var(--color-on-surface);
  font-weight: 600;
}

/* Footer */
footer {
  background-color: var(--color-surface-container-high);
  padding: var(--spacing-lg) var(--spacing-container);
  text-align: center;
  border-top: 1px solid var(--color-outline-variant);
  margin-top: 80px;
}

footer p {
  font-size: 14px;
  color: var(--color-on-surface-variant);
}

footer a {
  color: var(--color-primary);
  font-weight: 600;
}

footer a:hover {
  text-decoration: underline;
}

/* Accessibility & Mobile */
@media (max-width: 375px) {
  h1 {
    font-size: 28px;
    line-height: 36px;
  }

  .hero {
    padding: 40px var(--spacing-container) 60px;
  }

  .hero .cta-button {
    padding: 12px 24px;
    font-size: 14px;
  }

  .values {
    padding: 60px var(--spacing-container);
  }

  .installation {
    padding: 60px var(--spacing-container);
  }
}

/* Focus styles for keyboard navigation */
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  header,
  .cta-header,
  .os-toggle {
    display: none;
  }
}