/**
 * AI Days - 女性向けUI/UX最適化スタイル
 *
 * ピンク×パープルグラデーション + ラメ効果
 * モバイルファースト設計
 *
 * @version 2.0.0
 */

/* ===================================
   ✨ ラメ・キラキラエフェクト
   =================================== */
@keyframes sparkle {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.sparkle-effect {
  position: relative;
  overflow: hidden;
}

.sparkle-effect::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(255, 255, 255, 0.3) 50%,
    transparent 70%
  );
  animation: shimmer 3s infinite;
  pointer-events: none;
}

/* ラメドット */
.glitter-dots {
  position: relative;
}

.glitter-dots::after {
  content: '✨';
  position: absolute;
  top: -10px;
  right: -10px;
  font-size: 20px;
  animation: sparkle 2s infinite;
}

/* ===================================
   🎨 グラデーション背景 - 落ち着いたトーン
   =================================== */
.gradient-bg-main {
  background: linear-gradient(135deg, #d4a5a5 0%, #9c8aa4 100%);
  background-size: 200% 200%;
  animation: gradient-shift 10s ease infinite;
}

.gradient-bg-soft {
  background: linear-gradient(135deg, #f5f0eb 0%, #e8d5d5 100%);
  background-size: 200% 200%;
  animation: gradient-shift 10s ease infinite;
}

.gradient-bg-overlay {
  background: linear-gradient(135deg, rgba(212, 165, 165, 0.95) 0%, rgba(156, 138, 164, 0.95) 100%);
}

/* ===================================
   💖 ヘッダー
   =================================== */
.site-header {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(212, 165, 165, 0.08);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: all var(--transition-base);
}

.site-header.scrolled {
  box-shadow: 0 4px 30px rgba(212, 165, 165, 0.12);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-2xl);
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  transition: all var(--transition-base);
}

.site-logo:hover {
  transform: scale(1.05);
}

.site-logo::before {
  content: '✨';
  font-size: 28px;
  filter: drop-shadow(0 2px 4px rgba(212, 165, 165, 0.3));
  animation: float 3s ease-in-out infinite;
}

/* ナビゲーションメニュー */
.main-navigation {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.main-navigation a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  color: var(--gray-700);
  font-weight: 500;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  position: relative;
  min-height: 48px;
}

.main-navigation a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 3px;
  background: var(--gradient-main);
  border-radius: 2px;
  transition: transform var(--transition-base);
}

.main-navigation a:hover {
  color: var(--brand-primary);
  background: var(--gradient-soft);
}

.main-navigation a:hover::before {
  transform: translateX(-50%) scaleX(1);
}

/* ===================================
   🌸 ヒーローセクション（トップページ）
   =================================== */
.hero-section {
  position: relative;
  padding: var(--space-20) 0;
  background: linear-gradient(135deg, #f5f0eb 0%, #e8d5d5 100%);
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(212, 165, 165, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(156, 138, 164, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: var(--space-6);
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
  position: relative;
}

.hero-title::after {
  content: '✨';
  position: absolute;
  top: -20px;
  right: -20px;
  font-size: 2rem;
  animation: sparkle 2s infinite;
}

.hero-description {
  font-size: var(--text-xl);
  color: var(--gray-700);
  margin-bottom: var(--space-8);
  line-height: 2;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===================================
   📰 記事カード
   =================================== */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.post-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(61, 57, 53, 0.06);
  transition: all var(--transition-base);
  position: relative;
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.post-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(212, 165, 165, 0.12);
}

.post-card:hover::before {
  transform: scaleX(1);
}

.post-thumbnail {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.post-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.post-card:hover .post-thumbnail img {
  transform: scale(1.1);
}

.post-thumbnail::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.3), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.post-card:hover .post-thumbnail::after {
  opacity: 1;
}

.post-content {
  padding: var(--space-6);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.post-category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--white);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-base);
}

.post-category:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.post-date {
  font-size: var(--text-sm);
  color: var(--gray-500);
}

.post-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  line-height: 1.5;
}

.post-title a {
  color: var(--gray-900);
  text-decoration: none;
  background: linear-gradient(to right, var(--brand-pink), var(--brand-purple));
  background-size: 0% 2px;
  background-repeat: no-repeat;
  background-position: left bottom;
  transition: background-size var(--transition-base);
}

.post-title a:hover {
  background-size: 100% 2px;
  color: var(--brand-primary);
}

.post-excerpt {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.post-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--gray-100);
}

.reading-time {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--gray-500);
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--brand-primary);
  text-decoration: none;
  transition: all var(--transition-base);
}

.read-more:hover {
  gap: var(--space-3);
  color: var(--dusty-rose);
}

/* ===================================
   💌 フローティングCTAボタン
   =================================== */
.floating-cta {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-fixed);
  opacity: 0;
  transform: translateY(100px);
  transition: all var(--transition-base);
}

.floating-cta.visible {
  opacity: 1;
  transform: translateY(0);
}

.floating-cta-button {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  background: var(--gradient-main);
  color: var(--white);
  border-radius: var(--radius-full);
  box-shadow: 0 8px 30px rgba(212, 165, 165, 0.25);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
  animation: float 3s ease-in-out infinite;
}

.floating-cta-button:hover {
  box-shadow: 0 12px 40px rgba(212, 165, 165, 0.35);
  transform: scale(1.05);
}

.floating-cta-button::before {
  content: '✨';
  animation: sparkle 2s infinite;
}

/* ===================================
   🎀 情報ボックス（共感デザイン）
   =================================== */
.info-box {
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  margin: var(--space-6) 0;
  border-left: 4px solid;
  position: relative;
  overflow: hidden;
}

.info-box::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  opacity: 0.1;
  font-size: 80px;
  line-height: 1;
}

.info-box.info {
  background: linear-gradient(135deg, #dbeafe 0%, #e0e7ff 100%);
  border-color: var(--info);
}

.info-box.info::before {
  content: 'ℹ️';
}

.info-box.success {
  background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
  border-color: var(--success);
}

.info-box.success::before {
  content: '✓';
}

.info-box.warning {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-color: var(--warning);
}

.info-box.warning::before {
  content: '⚠';
}

.info-box.error {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  border-color: var(--error);
}

.info-box.error::before {
  content: '✕';
}

.info-box-title {
  font-weight: 700;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ===================================
   📱 モバイル最適化
   =================================== */
@media (max-width: 767px) {
  .posts-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .floating-cta {
    bottom: var(--space-4);
    right: var(--space-4);
    left: var(--space-4);
  }

  .floating-cta-button {
    width: 100%;
    justify-content: center;
  }

  .hero-section {
    padding: var(--space-12) 0;
  }

  .hero-cta {
    flex-direction: column;
  }

  .hero-cta .btn {
    width: 100%;
  }
}

/* ===================================
   💫 ローディングアニメーション
   =================================== */
.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--gray-200);
  border-top-color: var(--brand-pink);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===================================
   🌈 カテゴリバッジ
   =================================== */
.category-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.category-badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left var(--transition-slow);
}

.category-badge:hover::before {
  left: 100%;
}

/* ===================================
   ❤️ フッター
   =================================== */
.site-footer {
  background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
  color: var(--gray-300);
  padding: var(--space-16) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-main);
}

.footer-widgets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--text-sm);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--gray-400);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: var(--soft-pink);
}

/* ===================================
   🎨 アクセシビリティ
   =================================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* フォーカス表示 */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 3px solid var(--soft-pink);
  outline-offset: 2px;
}

/* ===================================
   ✨ スクロールアニメーション
   =================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}