/* stylelint-disable no-descending-specificity */
/* QA² Homepage Styles */

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

/* Base Styles */
:root {
  --color-background: #0a0a12;
  --color-text: #fff;
  --color-text-secondary: #ccc;
  --color-accent: #6366f1;
  --font-family: -apple-system, blinkmacsystemfont, "Segoe UI", roboto, "Helvetica Neue", arial, sans-serif;
  --font-size-base: 16px;
  --font-size-small: 14px;
  --font-size-large: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-logo: 64px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --max-width: 800px;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: radial-gradient(circle at center, #12121a 0%, #0a0a10 50%, #050508 100%);
  background-attachment: fixed;
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: var(--font-size-2xl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-large);
}

p {
  margin-bottom: var(--spacing-sm);
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.8;
}

ul {
  list-style: none;
  padding-left: 0;
  margin-left: 0;
}

/* Navigation */
nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) 0;
}

nav a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

nav a:hover {
  color: var(--color-text);
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* Canvas Background */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* Main Content */
main {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 150px);
  text-align: center;
  padding: var(--spacing-md);
}

/* Logo */
.logo {
position: relative;
  display: inline-block;
  font-family: 'Oxanium', system-ui, sans-serif;
  font-size: var(--font-size-logo);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.6em;
  text-shadow:
    0 0 10px rgb(0 0 0 / 80%),
    0 0 20px rgb(0 0 0 / 50%),
    2px 2px 4px rgb(0 0 0 / 90%);
}

.logo-base {
  display: inline-block;
}

.logo-sup {
  position: absolute;
  top: -0.35em;
  right: -1.2em;
  font-size: 0.58em;
  font-weight: 500;
}

/* Description */
.description {
  font-size: var(--font-size-large);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--spacing-lg);
  text-shadow:
    0 0 8px rgb(0 0 0 / 80%),
    1px 1px 3px rgb(0 0 0 / 90%);
}

/* Audio Control */
.audio-control {
  position: fixed;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 100;
}

.audio-button {
  background: rgb(255 255 255 / 10%);
  border: 1px solid rgb(255 255 255 / 20%);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease;
  color: var(--color-text);
  font-size: 20px;
}

.audio-button:hover {
  background: rgb(255 255 255 / 20%);
}

/* Footer */
footer {
  position: relative;
  z-index: 1;
  padding: var(--spacing-md);
  text-align: center;
}

/* Page Content (Support & Privacy) */
.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.page-content h1 {
  margin-bottom: var(--spacing-lg);
}

.page-content section {
  margin-bottom: var(--spacing-xl);
}

.page-content section h2 {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid rgb(255 255 255 / 10%);
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.back-link:hover {
  color: var(--color-text);
}

/* FAQ */
.faq-item {
  margin-bottom: var(--spacing-md);
}

.faq-item dt {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.faq-item dd {
  color: var(--color-text-secondary);
}

/* Meta Info */
.meta-info {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-lg);
}

/* Responsive Design */

/* Mobile (default) */
@media screen and (max-width: 480px) {
  :root {
    --font-size-base: 14px;
    --font-size-logo: 48px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
  }

  .logo {
    font-size: 48px;
  }

  .description {
    font-size: var(--font-size-base);
  }

  nav {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

/* Tablet */
@media screen and (min-width: 481px) and (max-width: 768px) {
  :root {
    --font-size-logo: 56px;
  }

  .logo {
    font-size: 56px;
  }
}

/* Desktop */
@media screen and (min-width: 769px) {
  :root {
    --font-size-logo: 72px;
  }

  .logo {
    font-size: 72px;
  }

  .description {
    font-size: var(--font-size-xl);
  }
}

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