/* RYVIUS.JP - Modern Responsive Stylesheet */

/* ========================================
   CSS Variables
   ======================================== */
:root {
  /* Primary colors - Blue theme inspired by space/sci-fi */
  --primary-color: #3366ff;
  --primary-dark: #2244cc;
  --primary-light: #6699ff;

  /* Accent colors */
  --accent-color: #ff6633;
  --accent-light: #ff9966;

  /* Neutral colors */
  --bg-color: #0a0a1a;
  --bg-secondary: #141428;
  --bg-card: #1a1a2e;
  --text-color: #e0e0e0;
  --text-muted: #888899;
  --border-color: #333355;

  /* Typography */
  --font-main: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  --font-heading: 'Noto Sans JP', sans-serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);

  /* Container width */
  --container-max: 1200px;
  --container-narrow: 800px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

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

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

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

/* ========================================
   Layout
   ======================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-narrow {
  max-width: var(--container-narrow);
}

/* ========================================
   Header
   ======================================== */
.site-header {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-color) 100%);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.site-logo h1 {
  font-size: 1.5rem;
  margin: 0;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-logo .subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: none;
}

@media (min-width: 768px) {
  .site-logo .subtitle {
    display: block;
  }
}

/* ========================================
   Navigation
   ======================================== */
.nav-toggle {
  display: block;
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-sm);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.main-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md);
}

.main-nav.active {
  display: block;
}

@media (min-width: 768px) {
  .main-nav {
    display: block;
    position: static;
    background: none;
    border: none;
    padding: 0;
  }
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

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

.nav-list a {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--primary-light);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-color) 100%);
  padding: var(--spacing-xxl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, rgba(51, 102, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 3.5rem;
  }
}

.hero .lead {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* ========================================
   Cards
   ======================================== */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-xl) 0;
}

@media (min-width: 576px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card h3 {
  color: var(--primary-light);
  margin-bottom: var(--spacing-sm);
}

.card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--primary-light);
  font-weight: 500;
}

.card-link:hover {
  color: var(--accent-color);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: white;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-light);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
}

/* ========================================
   Sections
   ======================================== */
.section {
  padding: var(--spacing-xxl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  color: var(--text-muted);
}

/* ========================================
   Content Pages
   ======================================== */
.page-content {
  padding: var(--spacing-xl) 0;
}

.page-content h1 {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--primary-color);
}

.page-content h2 {
  margin-top: var(--spacing-xl);
  color: var(--primary-light);
}

.page-content ul,
.page-content ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.page-content li {
  margin-bottom: var(--spacing-sm);
}

/* ========================================
   Flash/Ruffle Player
   ======================================== */
.flash-player {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.flash-player object,
.flash-player embed {
  max-width: 100%;
  height: auto;
}

.flash-controls {
  margin-top: var(--spacing-md);
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0;
  margin-top: auto;
}

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

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.copyright {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ========================================
   Utilities
   ======================================== */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

/* ========================================
   BBS / Forum Styles
   ======================================== */
.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.post-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.post-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.post-title {
  font-weight: 600;
  color: var(--primary-light);
}

.post-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.post-body {
  line-height: 1.7;
}

/* Form Styles */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-color);
  font-size: 1rem;
  transition: border-color 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 575px) {
  html {
    font-size: 14px;
  }

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