/*
Theme Name: アオナビ
Theme URI: https://aonavi.example.com
Author: アオナビ制作チーム
Author URI: https://aonavi.example.com
Description: 資格試験の情報・合格対策記事を発信するサイト「アオナビ」のオリジナルWordPressテーマ。白と淡い色味でクリーンにデザインされています。
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: aonavi
Tags: blog, education, clean, responsive
*/

/* =============================================
   CSS カスタムプロパティ（変数）
============================================= */
:root {
  --color-primary: #4A90D9;       /* メインブルー */
  --color-primary-light: #E8F3FC; /* 淡いブルー背景 */
  --color-primary-dark: #2C6FAC;  /* 濃いブルー */
  --color-accent: #7BC4A0;        /* アクセントグリーン */
  --color-accent-light: #EBF7F1;  /* 淡いグリーン背景 */
  --color-yellow: #F5C842;        /* 強調イエロー */
  --color-yellow-light: #FFFBE8;  /* 淡いイエロー背景 */

  --color-white: #FFFFFF;
  --color-bg: #F7F9FC;            /* ページ背景（極淡グレー） */
  --color-surface: #FFFFFF;       /* カード背景 */
  --color-border: #E2EAF0;        /* ボーダー */

  --color-text: #2D3748;          /* 本文テキスト */
  --color-text-light: #718096;    /* サブテキスト */
  --color-text-muted: #A0AEC0;    /* ミュートテキスト */

  --font-main: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'メイリオ', sans-serif;
  --font-heading: 'Noto Sans JP', sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 4px rgba(74, 144, 217, 0.08);
  --shadow-md: 0 4px 16px rgba(74, 144, 217, 0.12);
  --shadow-lg: 0 8px 32px rgba(74, 144, 217, 0.16);

  --transition: 0.25s ease;
  --max-width: 1120px;
  --header-height: 68px;
}

/* =============================================
   リセット & ベーススタイル
============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* =============================================
   レイアウト共通
============================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 72px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

.section-title span {
  color: var(--color-primary);
}

.section-desc {
  margin-top: 12px;
  font-size: 0.95rem;
  color: var(--color-text-light);
}

/* =============================================
   ヘッダー
============================================= */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ロゴ */
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 900;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-name {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.logo-tagline {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
}

/* グローバルナビ */
#global-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

#global-nav .nav-list a {
  display: block;
  padding: 6px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-full);
  transition: background var(--transition), color var(--transition);
}

#global-nav .nav-list a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-cta a {
  background: var(--color-primary) !important;
  color: #fff !important;
  font-weight: 700 !important;
}

.nav-cta a:hover {
  background: var(--color-primary-dark) !important;
}

/* ハンバーガーメニュー */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  gap: 5px;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* =============================================
   ヒーローセクション
============================================= */
#hero {
  background: linear-gradient(135deg, #E8F3FC 0%, #EBF7F1 50%, #FFFBE8 100%);
  padding: 96px 0 88px;
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(74,144,217,0.12) 0%, transparent 70%);
  pointer-events: none;
}

#hero::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -40px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(123,196,160,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* センタリングレイアウト（ヒーロー簡略版） */
.hero-inner--centered {
  grid-template-columns: 1fr;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero-inner--centered .hero-badge {
  display: inline-flex;
}

.hero-inner--centered .hero-actions {
  justify-content: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-light);
  border: 1px solid rgba(123,196,160,0.4);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.35;
  color: var(--color-text);
  margin-bottom: 16px;
}

/* メインキャッチコピー強調版 */
.hero-title--main {
  font-size: clamp(2.8rem, 7vw, 5rem);
  line-height: 1.25;
  margin-bottom: 36px;
  letter-spacing: 0.02em;
}

.hero-title .highlight {
  color: var(--color-primary);
  position: relative;
}

.hero-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 6px;
  background: rgba(74, 144, 217, 0.2);
  border-radius: 3px;
  z-index: -1;
}

.hero-concept {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.hero-desc {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ヒーロー右側のビジュアル */
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 16px 12px;
  text-align: center;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.stat-number {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1.1;
}

.stat-unit {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 700;
}

.stat-label {
  font-size: 0.72rem;
  color: var(--color-text-light);
  margin-top: 4px;
}

.hero-category-pills {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.hero-category-pills p {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  letter-spacing: 0.06em;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid rgba(74,144,217,0.2);
}

/* =============================================
   ボタン共通
============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(74, 144, 217, 0.35);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74, 144, 217, 0.45);
}

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

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

.btn-accent {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(123, 196, 160, 0.35);
}

.btn-accent:hover {
  background: #5aab85;
  color: #fff;
  transform: translateY(-2px);
}

/* =============================================
   特徴セクション
============================================= */
#features {
  background: var(--color-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
  border-radius: 0 0 0 var(--radius-lg);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.feature-card:nth-child(2) .feature-icon {
  background: var(--color-accent-light);
}

.feature-card:nth-child(3) .feature-icon {
  background: var(--color-yellow-light);
}

.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* =============================================
   新着記事セクション
============================================= */
#latest-posts {
  background: var(--color-bg);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.post-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

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

.post-thumbnail {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  position: relative;
  overflow: hidden;
}

.post-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.post-category-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
}

.post-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.post-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.55;
  margin-bottom: 10px;
  flex: 1;
}

.post-title a {
  color: inherit;
}

.post-title a:hover {
  color: var(--color-primary);
}

.post-excerpt {
  font-size: 0.82rem;
  color: var(--color-text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* サムネイルなし時のフォールバック */
.no-thumbnail-link {
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  position: absolute;
  top: 0;
  left: 0;
}

/* ranked カード */
.post-card--ranked .post-thumbnail {
  position: relative;
}

.posts-more {
  text-align: center;
}

/* 記事なし時メッセージ */
.no-posts-message {
  text-align: center;
  padding: 56px 20px;
}

.no-posts-icon {
  font-size: 3.5rem;
  margin-bottom: 16px;
}

.no-posts-text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* =============================================
   カテゴリセクション
============================================= */
#categories {
  background: var(--color-white);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

/* 5カラムカテゴリグリッド */
.categories-grid--5col {
  grid-template-columns: repeat(5, 1fr);
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 28px 16px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  text-decoration: none;
  transition: all var(--transition);
  text-align: center;
}

.category-card:hover {
  background: var(--color-primary-light);
  border-color: rgba(74,144,217,0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.category-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.category-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
}

.category-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* =============================================
   バナー・CTAセクション
============================================= */
#cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #2C6FAC 100%);
  padding: 64px 0;
  position: relative;
  overflow: hidden;
}

#cta-banner::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 320px;
  height: 320px;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
}

#cta-banner::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -40px;
  width: 240px;
  height: 240px;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
}

.cta-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.cta-title {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.4;
  margin-bottom: 12px;
}

.cta-desc {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  line-height: 1.8;
}

.cta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-white {
  background: #fff;
  color: var(--color-primary);
  font-weight: 700;
}

.btn-white:hover {
  background: #f0f7ff;
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-outline-white {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.6);
}

.btn-outline-white:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}

/* =============================================
   フッター
============================================= */
#site-footer {
  background: #1a2a3a;
  color: rgba(255,255,255,0.75);
  padding: 56px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo-name {
  color: #fff;
}

.footer-brand .logo-tagline {
  color: rgba(255,255,255,0.5);
}

.footer-brand-desc {
  font-size: 0.85rem;
  line-height: 1.8;
  margin-top: 16px;
  color: rgba(255,255,255,0.6);
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.06em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.4);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: rgba(255,255,255,0.4);
  font-size: 0.78rem;
}

.footer-bottom-links a:hover {
  color: rgba(255,255,255,0.8);
}

/* =============================================
   レスポンシブ対応
============================================= */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .categories-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .categories-grid--5col {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  /* ナビ */
  #global-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--color-white);
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    z-index: 99;
  }

  #global-nav.is-open {
    display: block;
  }

  #global-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0 24px;
  }

  #global-nav .nav-list a {
    border-radius: var(--radius-md);
    padding: 12px 16px;
  }

  .menu-toggle {
    display: flex;
  }

  /* ヒーロー */
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  /* 記事グリッド */
  .posts-grid {
    grid-template-columns: 1fr;
  }

  /* 特徴 */
  .features-grid {
    grid-template-columns: 1fr;
  }

  /* カテゴリ */
  .categories-grid,
  .categories-grid--5col {
    grid-template-columns: repeat(2, 1fr);
  }

  /* フッター */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .section {
    padding: 52px 0;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }

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

  .btn {
    width: 100%;
    justify-content: center;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .categories-grid,
  .categories-grid--5col {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* =============================================
   ウィジェットエリア
============================================= */
.widget {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.widget-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary-light);
  margin-bottom: 16px;
}

/* =============================================
   投稿ページ共通
============================================= */
.content-area {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px;
}

.entry-title {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.45;
  margin-bottom: 16px;
}

.entry-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.entry-content h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 40px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
}

.entry-content p {
  margin-bottom: 20px;
  line-height: 1.9;
}