/* ==========================================================================
   Sudsakorn and the Dragon-Horse — Support Site Styles
   Mobile-first, WCAG 2.2 AA compliant, lightweight
   ========================================================================== */

/* CSS Custom Properties
   ========================================================================== */
:root {
  /* Color palette - designed for contrast and calm bedtime theme */
  --color-primary: #4F46E5; /* Indigo */
  --color-primary-light: #818CF8;
  --color-primary-dark: #3730A3;
  --color-secondary: #06B6D4; /* Cyan */
  --color-accent: #F59E0B; /* Amber */
  --color-text: #1F2937; /* Gray 800 */
  --color-text-muted: #6B7280; /* Gray 500 */
  --color-bg: #ffffff;
  --color-bg-alt: #F9FAFB; /* Gray 50 */
  --color-bg-accent: #EEF2FF; /* Indigo 50 */
  --color-border: #E5E7EB; /* Gray 200 */
  --color-link: #4F46E5;
  --color-link-hover: #3730A3;
  --color-focus: #818CF8;
  --color-success: #10B981; /* Green */
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-shadow-lg: rgba(0, 0, 0, 0.15);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  --line-height-heading: 1.2;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Layout */
  --max-width: 72rem; /* 1152px */
  --max-width-text: 48rem; /* 768px */
  --border-radius: 0.75rem;
  --border-radius-lg: 1rem;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: linear-gradient(135deg, #EEF2FF 0%, #F9FAFB 50%, #FEFCE8 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* Skip to main content link (accessibility) */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm);
  text-decoration: none;
  z-index: 100;
}

.skip-to-main:focus {
  top: 0;
}

/* Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  margin: var(--spacing-lg) 0 var(--spacing-md);
  font-weight: 600;
  line-height: var(--line-height-heading);
  color: var(--color-text);
}

h1 {
  font-size: 2rem; /* 32px */
  margin-top: 0;
}

h2 {
  font-size: 1.5rem; /* 24px */
  margin-top: var(--spacing-xl);
}

h3 {
  font-size: 1.25rem; /* 20px */
}

p {
  margin: 0 0 var(--spacing-md);
}

/* Links
   ========================================================================== */
a {
  color: var(--color-link);
  text-decoration: underline;
  transition: color var(--transition);
}

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

a:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Layout
   ========================================================================== */
header, main, footer {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-md);
}

main {
  min-height: 60vh;
  padding-bottom: var(--spacing-xl);
}

/* Header & Navigation
   ========================================================================== */
header {
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 3px var(--color-shadow);
}

nav {
  text-align: center;
  font-size: 1.125rem;
  padding: var(--spacing-sm) 0;
}

nav a {
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-md);
  display: inline-block;
  transition: all var(--transition);
  border-radius: var(--border-radius);
  color: var(--color-text);
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

nav a:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-accent);
}

nav a:hover::after {
  width: 60%;
}

nav a:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Footer
   ========================================================================== */
footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

footer a {
  color: var(--color-text-muted);
}

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

/* Buttons & CTAs
   ========================================================================== */
.btn, .cta {
  display: inline-block;
  padding: 1rem 2rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius-lg);
  font-weight: 600;
  font-size: 1.125rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
  position: relative;
  overflow: hidden;
}

.btn::before, .cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before, .cta:hover::before {
  left: 100%;
}

.btn:hover, .cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
  color: white;
}

.btn:active, .cta:active {
  transform: translateY(0);
}

.btn:focus, .cta:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

/* Lists
   ========================================================================== */
ul, ol {
  margin: 0 0 var(--spacing-md);
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
}

/* Sections
   ========================================================================== */
section {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 2px 12px var(--color-shadow);
}

section h2:first-child {
  margin-top: 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  background: linear-gradient(135deg, rgba(238, 242, 255, 0.8) 0%, rgba(249, 250, 251, 0.8) 100%);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 20px var(--color-shadow);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-icon {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-lg);
  border-radius: 2rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* Hero / Tagline
   ========================================================================== */
.tagline {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin: var(--spacing-md) 0 var(--spacing-lg);
  line-height: 1.5;
}

/* Features list - styled for better readability
   ========================================================================== */
.features {
  list-style: none;
  padding: 0;
  margin: var(--spacing-md) 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.features li {
  padding: var(--spacing-md);
  margin-bottom: 0;
  background: white;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px var(--color-shadow);
  transition: all var(--transition);
  position: relative;
  padding-left: 3rem;
}

.features li::before {
  content: '✓';
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  width: 1.5rem;
  height: 1.5rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.875rem;
}

.features li:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 12px var(--color-shadow-lg);
  border-left-color: var(--color-secondary);
}

/* Screenshots / Images
   ========================================================================== */
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius);
}

.screenshots {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-lg);
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 20px var(--color-shadow);
}

.screenshots img {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  border-radius: var(--border-radius-lg);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

.screenshots img:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

/* Support page - FAQ styling
   ========================================================================== */
.faq-item {
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px var(--color-shadow);
  transition: all var(--transition);
}

.faq-item:hover {
  box-shadow: 0 4px 12px var(--color-shadow-lg);
  transform: translateY(-2px);
}

.faq-item h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.faq-item h3::before {
  content: '❓';
  font-size: 1.25rem;
}

/* Privacy policy - emphasis
   ========================================================================== */
.privacy-summary {
  padding: var(--spacing-md);
  background-color: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: 4px;
  margin: var(--spacing-lg) 0;
}

/* Effective date
   ========================================================================== */
.effective-date {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin: var(--spacing-sm) 0 var(--spacing-lg);
}

/* 404 Page
   ========================================================================== */
.error-page {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.error-page h1 {
  font-size: 3rem;
  color: var(--color-primary);
}

/* Responsive Typography
   ========================================================================== */
@media (min-width: 640px) {
  :root {
    --font-size-base: 18px;
  }

  h1 {
    font-size: 2.5rem; /* 45px */
  }

  h2 {
    font-size: 1.75rem; /* 31.5px */
  }

  .hero h1 {
    font-size: 3rem;
  }

  .screenshots {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .app-icon {
    width: 140px;
    height: 140px;
  }
}

@media (min-width: 768px) {
  header, main, footer {
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }

  .screenshots {
    gap: var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .screenshots {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero h1 {
    font-size: 3.5rem;
  }
}

/* Print Styles
   ========================================================================== */
@media print {
  header nav,
  footer {
    display: none;
  }

  a {
    text-decoration: underline;
    color: var(--color-text);
  }

  a[href^="http"]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}

/* Reduced Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High Contrast Mode Support
   ========================================================================== */
@media (prefers-contrast: high) {
  :root {
    --color-text: #000000;
    --color-bg: #ffffff;
    --color-border: #000000;
  }

  a:focus,
  button:focus,
  .btn:focus {
    outline-width: 3px;
  }
}

/* Animations
   ========================================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Apply animations */
main section {
  animation: fadeInUp 0.6s ease-out backwards;
}

main section:nth-child(1) {
  animation-delay: 0.1s;
}

main section:nth-child(2) {
  animation-delay: 0.2s;
}

main section:nth-child(3) {
  animation-delay: 0.3s;
}

main section:nth-child(4) {
  animation-delay: 0.4s;
}

header {
  animation: fadeIn 0.3s ease-out;
}