/* pages.css — 情報ページ共通スタイル (まぜるなきけん) */

:root {
  --bg: #0f0f1a;
  --bg2: #1a1a2e;
  --card: #22223a;
  --card-hover: #2c2c48;
  --border: #333355;
  --text: #e8e6f0;
  --text2: #8888aa;
  --accent: #a855f7;
  --accent-light: rgba(168,85,247,0.15);
  --accent2: #22d3ee;
  --accent2-light: rgba(34,211,238,0.12);
  --green: #34d399;
  --green-light: rgba(52,211,153,0.12);
  --warn: #f59e0b;
  --font: 'Noto Sans JP', sans-serif;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --glow: 0 0 12px rgba(168,85,247,0.25);
  --fast: 0.18s ease;
  --max-w: 780px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(168,85,247,0.05) 0%, transparent 50%),
    radial-gradient(circle at 85% 80%, rgba(34,211,238,0.04) 0%, transparent 50%);
}

a { color: var(--accent); text-decoration: none; transition: color var(--fast); }
a:hover { color: var(--accent2); text-decoration: underline; }

/* ===== Header ===== */
.page-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
}
.page-header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.header-brand {
  font-size: 17px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.header-brand:hover {
  text-decoration: none;
  filter: brightness(1.2);
}
.header-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.header-nav a {
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--fast);
  white-space: nowrap;
}
.header-nav a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-light);
  text-decoration: none;
}
.header-nav a.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-light);
  font-weight: 600;
}

/* ===== Main Content ===== */
.page-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px 60px;
  width: 100%;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-subtitle {
  font-size: 14px;
  color: var(--text2);
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

/* Sections */
.section {
  margin-bottom: 36px;
}
.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
}
.section p {
  font-size: 14px;
  color: var(--text);
  line-height: 1.9;
  margin-bottom: 12px;
}
.section ul, .section ol {
  padding-left: 24px;
  margin-bottom: 12px;
}
.section li {
  font-size: 14px;
  line-height: 1.9;
  margin-bottom: 4px;
  color: var(--text);
}
.section li::marker {
  color: var(--accent);
}

/* Info cards */
.info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: border-color var(--fast), box-shadow var(--fast);
}
.info-card:hover {
  border-color: var(--accent);
  box-shadow: var(--glow);
}
.info-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.info-card p {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.8;
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.feature-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  transition: all var(--fast);
}
.feature-item:hover {
  border-color: var(--accent);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}
.feature-icon {
  font-size: 32px;
  margin-bottom: 10px;
  display: block;
}
.feature-item h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}
.feature-item p {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.7;
}

/* Step cards (for how-to-play) */
.step-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 14px;
  transition: border-color var(--fast), box-shadow var(--fast);
}
.step-card:hover {
  border-color: var(--accent);
  box-shadow: var(--glow);
}
.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  border-radius: 50%;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}
.step-content h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}
.step-content p {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.8;
}

/* Tips */
.tip-box {
  background: var(--accent2-light);
  border: 1px solid rgba(34,211,238,0.3);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
}
.tip-box h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent2);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tip-box p, .tip-box li {
  font-size: 13px;
  color: var(--text);
  line-height: 1.8;
}

/* FAQ */
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color var(--fast);
}
.faq-item:hover {
  border-color: var(--accent);
}
.faq-q {
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  transition: background var(--fast);
}
.faq-q:hover {
  background: var(--card-hover);
}
.faq-q::after {
  content: '▸';
  font-size: 12px;
  color: var(--text2);
  transition: transform 0.2s;
}
.faq-item.open .faq-q::after {
  transform: rotate(90deg);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-item.open .faq-a {
  max-height: 500px;
  padding: 0 20px 14px;
}
.faq-a p {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.8;
}

/* Contact form */
.contact-form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 14px;
  color: var(--text);
  outline: none;
  transition: border-color var(--fast);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-light);
}
.form-group textarea {
  min-height: 120px;
  resize: vertical;
}
.form-submit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 28px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(168,85,247,0.3);
  transition: all var(--fast);
}
.form-submit:hover {
  box-shadow: 0 6px 24px rgba(168,85,247,0.45);
  transform: translateY(-1px);
}
.form-submit:active {
  transform: scale(0.97);
}

/* Table */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 13px;
}
.info-table th, .info-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.info-table th {
  font-weight: 600;
  color: var(--accent);
  background: var(--card);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.info-table td {
  color: var(--text2);
}
.info-table tr:hover td {
  background: rgba(168,85,247,0.03);
}

/* ===== Footer ===== */
.page-footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 30px 24px 20px;
  margin-top: auto;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.footer-links a {
  font-size: 12px;
  color: var(--text2);
  transition: color var(--fast);
}
.footer-links a:hover {
  color: var(--accent);
  text-decoration: none;
}
.footer-copy {
  font-size: 11px;
  color: var(--text2);
  opacity: 0.7;
}

/* ===== Back to game button ===== */
.back-to-game {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  color: #fff;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(168,85,247,0.3);
  transition: all var(--fast);
  margin-top: 20px;
}
.back-to-game:hover {
  box-shadow: 0 6px 24px rgba(168,85,247,0.45);
  transform: translateY(-2px);
  color: #fff;
  text-decoration: none;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .page-header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .header-nav {
    gap: 4px;
    justify-content: flex-start;
  }
  .header-nav a {
    padding: 4px 10px;
    font-size: 11px;
  }
  .page-main {
    padding: 24px 16px 40px;
  }
  .page-title {
    font-size: 22px;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .step-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .footer-links {
    gap: 12px;
  }
}