/* ===================================
   TRADE BASE - Complete Stylesheet
   車買取店のホームページ + コラム機能
   =================================== */

/* ==========================================================================
   1. CSS Variables (カラー・フォント・スペーシング)
   ========================================================================== */
:root {
    /* カラーパレット */
    --color-primary: #1a2332;        /* ディープネイビー */
    --color-primary-dark: #0f1820;
    --color-primary-light: #2a3442;
    --color-accent: #ff6b35;          /* オレンジ */
    --color-accent-dark: #e85a24;
    --color-accent-light: #ff8556;
    --color-base: #f5f5f5;            /* クールグレー（ベース） */
    --color-concrete: #e0e0e0;        /* コンクリート */
    --color-text: #333333;
    --color-text-light: #666666;
    --color-text-lighter: #999999;
    --color-white: #ffffff;
    --color-black: #000000;
    
    /* 背景色 */
    --color-bg-light: #fafafa;
    --color-bg-dark: #0a0e14;
    
    /* ボーダー・シャドウ */
    --color-border: #d0d0d0;
    --shadow-sm: 0 2px 8px rgba(26, 35, 50, 0.08);
    --shadow-md: 0 4px 16px rgba(26, 35, 50, 0.12);
    --shadow-lg: 0 8px 32px rgba(26, 35, 50, 0.16);
    --shadow-xl: 0 16px 48px rgba(26, 35, 50, 0.20);
    
    /* フォント */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-heading: 'Bebas Neue', cursive;
    
    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* トランジション */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* ブレークポイント */
    --breakpoint-mobile: 767px;
    --breakpoint-tablet: 1024px;
    --breakpoint-desktop: 1200px;
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    line-height: 1.7;
    background-color: var(--color-base);
    background-image: 
        linear-gradient(90deg, rgba(26, 35, 50, 0.02) 1px, transparent 1px),
        linear-gradient(rgba(26, 35, 50, 0.02) 1px, transparent 1px);
    background-size: 20px 20px;
    overflow-x: hidden;
}

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

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

ul, ol {
    list-style: none;
}

/* ==========================================================================
   3. ユーティリティクラス
   ========================================================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

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

/* スクロールアニメーション用 */
[data-scroll-animation] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-scroll-animation].is-visible {
    opacity: 1;
}

[data-scroll-animation="fade-up"].is-visible {
    transform: translateY(0);
}

[data-scroll-animation="fade-up"] {
    transform: translateY(30px);
}

[data-scroll-animation="fade-down"].is-visible {
    transform: translateY(0);
}

[data-scroll-animation="fade-down"] {
    transform: translateY(-30px);
}

[data-scroll-animation="fade-left"].is-visible {
    transform: translateX(0);
}

[data-scroll-animation="fade-left"] {
    transform: translateX(30px);
}

[data-scroll-animation="fade-right"].is-visible {
    transform: translateX(0);
}

[data-scroll-animation="fade-right"] {
    transform: translateX(-30px);
}

[data-scroll-animation="zoom-in"].is-visible {
    transform: scale(1);
}

[data-scroll-animation="zoom-in"] {
    transform: scale(0.95);
}

/* ==========================================================================
   4. ローディングアニメーション
   ========================================================================== */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    /* 安全策: 5秒後に自動的にフェードアウト */
    animation: autoHideLoader 5s ease forwards;
}

@keyframes autoHideLoader {
    0%, 80% {
        opacity: 1;
        visibility: visible;
    }
    100% {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 107, 53, 0.2);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loader-logo {
    margin-top: var(--spacing-md);
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--color-white);
    letter-spacing: 2px;
}

/* ==========================================================================
   5. スクロール進捗バー
   ========================================================================== */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    z-index: 9999;
    box-shadow: 0 0 10px var(--color-accent);
    transition: width 0.1s ease;
}

/* ==========================================================================
   6. ヘッダー
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
    padding: var(--spacing-sm) 0;
}

.header-solid {
    background-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.header.scrolled {
    background-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--color-white);
    letter-spacing: 1px;
}

.logo i {
    font-size: 1.8rem;
    color: var(--color-accent);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-white);
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* ハンバーガーメニュー */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 30px;
    height: 3px;
    background-color: var(--color-white);
    transition: var(--transition-base);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* ==========================================================================
   7. パンくずリスト
   ========================================================================== */
.breadcrumb {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    margin-top: 80px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.breadcrumb-list li:not(:last-child)::after {
    content: '›';
    color: var(--color-text-lighter);
    margin-left: var(--spacing-xs);
}

.breadcrumb-list li:last-child {
    color: var(--color-text-lighter);
}

.breadcrumb-list a {
    color: var(--color-primary);
}

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

/* ==========================================================================
   8. ヒーローセクション
   ========================================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.9) 0%, rgba(26, 35, 50, 0.7) 100%);
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(30deg, transparent 24%, rgba(255, 107, 53, 0.05) 25%, rgba(255, 107, 53, 0.05) 26%, transparent 27%, transparent 74%, rgba(255, 107, 53, 0.05) 75%, rgba(255, 107, 53, 0.05) 76%, transparent 77%, transparent);
    background-size: 50px 50px;
    animation: patternMove 20s linear infinite;
}

@keyframes patternMove {
    0% { background-position: 0 0; }
    100% { background-position: 50px 50px; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--color-white);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.hero-title-main {
    display: block;
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 5rem);
    line-height: 1.2;
    letter-spacing: 2px;
}

.hero-title-sub {
    display: block;
    font-family: var(--font-heading);
    font-size: clamp(2rem, 6vw, 4rem);
    color: var(--color-accent);
    margin-top: var(--spacing-sm);
}

.highlight-glow {
    color: var(--color-accent);
    text-shadow: 0 0 20px rgba(255, 107, 53, 0.5);
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.hero-stat {
    text-align: center;
}

.hero-stat-number {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.hero-stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ==========================================================================
   9. ボタン
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

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

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

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

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

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

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

/* ==========================================================================
   10. セクション共通スタイル
   ========================================================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-label {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    letter-spacing: 3px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ==========================================================================
   11. 課題提起セクション
   ========================================================================== */
.problems {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.problem-card {
    background-color: var(--color-base);
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    transition: var(--transition-base);
    border: 2px solid transparent;
}

.problem-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.problem-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 2rem;
}

.problem-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.problem-text {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ==========================================================================
   12. サービス紹介セクション
   ========================================================================== */
.about {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-base);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.about-card {
    background-color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.about-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: 2rem;
}

.about-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.about-text {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ==========================================================================
   13. 強みセクション
   ========================================================================== */
.features {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.features-list {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.feature-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--color-base);
    border-radius: 12px;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-light));
}

.feature-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.feature-number {
    font-family: var(--font-heading);
    font-size: 5rem;
    color: var(--color-accent);
    opacity: 0.3;
    line-height: 1;
    text-align: center;
}

.feature-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.feature-text {
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ==========================================================================
   14. ご利用の流れ
   ========================================================================== */
.flow {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-base);
}

.flow-list {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.flow-item {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.flow-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.flow-step {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.flow-number {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    color: var(--color-white);
    font-weight: 700;
}

.flow-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.flow-text {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ==========================================================================
   15. 買取実績セクション
   ========================================================================== */
.results {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.result-card {
    background-color: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.result-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.result-image {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.result-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.result-card:hover .result-image img {
    transform: scale(1.1);
}

.result-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.375rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.result-content {
    padding: var(--spacing-md);
}

.result-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.result-details {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.result-year,
.result-mileage {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.result-price {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.result-location {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.9rem;
    color: var(--color-text-lighter);
}

.result-location i {
    color: var(--color-accent);
}

/* ==========================================================================
   16. CTAセクション
   ========================================================================== */
.cta {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(30deg, transparent 24%, rgba(255, 107, 53, 0.05) 25%, rgba(255, 107, 53, 0.05) 26%, transparent 27%, transparent 74%, rgba(255, 107, 53, 0.05) 75%, rgba(255, 107, 53, 0.05) 76%, transparent 77%, transparent);
    background-size: 50px 50px;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--color-white);
}

.cta-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
}

.cta-text {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    line-height: 1.8;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================================================
   17. お問い合わせフォーム
   ========================================================================== */
.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-base);
}

.contact-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.contact-form {
    background-color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.required {
    color: var(--color-accent);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-input.error,
.form-textarea.error {
    border-color: #e74c3c;
}

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

.form-error {
    display: block;
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* ==========================================================================
   18. コラムセクション（トップページ）
   ========================================================================== */
.blog-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.blog-card {
    background-color: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.blog-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.blog-card-link {
    display: block;
}

.blog-card-image {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.blog-card:hover .blog-card-image img {
    transform: scale(1.1);
}

.blog-card-category {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.375rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.blog-card-content {
    padding: var(--spacing-md);
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-lighter);
}

.blog-card-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.blog-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-excerpt {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.95rem;
}

.blog-card-more i {
    transition: transform var(--transition-base);
}

.blog-card:hover .blog-card-more i {
    transform: translateX(5px);
}

.blog-more {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* ==========================================================================
   19. コラム一覧ページ
   ========================================================================== */
.blog-page {
    padding: var(--spacing-lg) 0;
    min-height: calc(100vh - 200px);
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    border-radius: 12px;
}

.page-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
}

.page-description {
    font-size: 1.125rem;
    opacity: 0.9;
}

.blog-page-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-lg);
}

/* サイドバー */
.blog-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-widget {
    background-color: var(--color-white);
    border-radius: 12px;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.sidebar-widget-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-accent);
}

/* 検索ボックス */
.search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: 25px;
    font-size: 0.95rem;
    transition: var(--transition-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.search-button {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--color-accent);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
}

.search-button:hover {
    background-color: var(--color-accent-dark);
    transform: scale(1.05);
}

/* カテゴリーリスト */
.category-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: var(--transition-base);
    cursor: pointer;
}

.category-item:hover,
.category-item.active {
    background-color: var(--color-base);
    color: var(--color-accent);
}

.category-name {
    font-weight: 500;
}

.category-count {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 0.25rem 0.625rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
}

.category-item.active .category-count {
    background-color: var(--color-accent);
}

/* 人気記事 */
.popular-posts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.popular-post-item {
    transition: var(--transition-base);
}

.popular-post-link {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs);
    border-radius: 8px;
    transition: var(--transition-base);
}

.popular-post-link:hover {
    background-color: var(--color-base);
}

.popular-post-image {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
}

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

.popular-post-content {
    flex: 1;
}

.popular-post-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary);
    line-height: 1.5;
    margin-bottom: 0.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.popular-post-date {
    font-size: 0.8rem;
    color: var(--color-text-lighter);
}

/* タグクラウド */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag-item {
    padding: 0.5rem 1rem;
    background-color: var(--color-base);
    color: var(--color-text);
    border-radius: 20px;
    font-size: 0.85rem;
    transition: var(--transition-base);
}

.tag-item:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

/* サイドバーCTA */
.sidebar-cta {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    text-align: center;
}

.sidebar-cta-title {
    color: var(--color-white);
    border-bottom-color: var(--color-accent);
}

.sidebar-cta-text {
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

/* メインコンテンツ */
.blog-main {
    min-height: 500px;
}

.blog-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.blog-list-item {
    background-color: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.blog-list-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.blog-list-link {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: var(--spacing-md);
}

.blog-list-image {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.blog-list-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.blog-list-item:hover .blog-list-image img {
    transform: scale(1.05);
}

.blog-list-category {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.375rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.blog-list-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.blog-list-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-lighter);
}

.blog-list-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.blog-list-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.blog-list-excerpt {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: auto;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-list-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.blog-list-tags {
    display: flex;
    gap: 0.5rem;
}

.blog-tag {
    padding: 0.25rem 0.75rem;
    background-color: var(--color-base);
    color: var(--color-text);
    border-radius: 12px;
    font-size: 0.8rem;
}

.blog-list-more {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.95rem;
}

.blog-list-item:hover .blog-list-more i {
    transform: translateX(5px);
}

/* 検索結果なし */
.no-results {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--color-white);
    border-radius: 12px;
}

.no-results i {
    font-size: 4rem;
    color: var(--color-text-lighter);
    margin-bottom: var(--spacing-md);
}

.no-results h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.no-results p {
    color: var(--color-text-light);
}

/* ページネーション */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.pagination-btn,
.pagination-number {
    padding: 0.75rem 1.25rem;
    background-color: var(--color-white);
    color: var(--color-primary);
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition-base);
    cursor: pointer;
}

.pagination-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pagination-btn:hover:not(:disabled),
.pagination-number:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-number.active {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.pagination-numbers {
    display: flex;
    gap: 0.5rem;
}

/* ==========================================================================
   20. コラム詳細ページ
   ========================================================================== */
.article-page {
    padding: var(--spacing-lg) 0;
    background-color: var(--color-white);
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-lg);
}

/* 記事メイン */
.article-main {
    background-color: var(--color-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.article-header {
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.article-category {
    display: inline-block;
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.5rem 1.25rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.article-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1.4;
    margin-bottom: var(--spacing-md);
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.article-date {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--color-text-lighter);
    font-size: 0.95rem;
}

.article-tags {
    display: flex;
    gap: 0.5rem;
}

.article-tag {
    padding: 0.375rem 1rem;
    background-color: var(--color-base);
    color: var(--color-text);
    border-radius: 20px;
    font-size: 0.85rem;
}

/* アイキャッチ画像 */
.article-featured-image {
    width: 100%;
    height: 500px;
    overflow: hidden;
}

.article-featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* SNSシェアボタン */
.article-share {
    padding: var(--spacing-md);
    background-color: var(--color-base);
}

.share-label {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.share-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.share-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-base);
}

.share-twitter {
    background-color: #1DA1F2;
    color: var(--color-white);
}

.share-twitter:hover {
    background-color: #0d8bd9;
    transform: translateY(-2px);
}

.share-facebook {
    background-color: #1877F2;
    color: var(--color-white);
}

.share-facebook:hover {
    background-color: #0e5fc7;
    transform: translateY(-2px);
}

.share-line {
    background-color: #00B900;
    color: var(--color-white);
}

.share-line:hover {
    background-color: #009600;
    transform: translateY(-2px);
}

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

.share-copy:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
}

.article-share-top .share-btn {
    width: 45px;
    height: 45px;
    padding: 0;
    justify-content: center;
    border-radius: 50%;
}

.article-share-top .share-btn span {
    display: none;
}

/* 目次 */
.article-toc {
    margin: var(--spacing-lg) var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-base);
    border-radius: 12px;
    border-left: 4px solid var(--color-accent);
}

.toc-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

#tableOfContents ol {
    list-style: decimal;
    padding-left: 1.5rem;
}

#tableOfContents li {
    margin-bottom: 0.5rem;
}

#tableOfContents a {
    color: var(--color-text);
    transition: var(--transition-base);
}

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

/* リード文 */
.article-lead {
    padding: 0 var(--spacing-md);
    margin: var(--spacing-lg) 0;
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--color-text-light);
}

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

/* 記事本文 */
.article-content {
    padding: 0 var(--spacing-md) var(--spacing-lg);
    font-size: 1.0625rem;
    line-height: 1.9;
    color: var(--color-text);
}

.article-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 3px solid var(--color-accent);
}

.article-content h3 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.article-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
    margin: var(--spacing-sm) 0;
}

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

.article-content ul,
.article-content ol {
    margin: var(--spacing-sm) 0;
    padding-left: 2rem;
}

.article-content ul {
    list-style: disc;
}

.article-content ol {
    list-style: decimal;
}

.article-content li {
    margin-bottom: 0.5rem;
}

/* 記事内Tips */
.article-tips,
.article-warning {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid;
}

.article-tips {
    background-color: #e8f5e9;
    border-color: #4caf50;
}

.article-tips h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #2e7d32;
    margin-bottom: var(--spacing-xs);
}

.article-tips h4 i {
    color: #ffc107;
}

.article-warning {
    background-color: #fff3e0;
    border-color: #ff9800;
}

.article-warning h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #e65100;
    margin-bottom: var(--spacing-xs);
}

/* 記事内CTA */
.article-cta {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    border-radius: 12px;
    text-align: center;
}

.article-cta h3 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.article-cta p {
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

/* 著者情報 */
.article-author {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) var(--spacing-md);
    background-color: var(--color-base);
    border-radius: 12px;
}

.author-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.author-avatar i {
    font-size: 3rem;
    color: var(--color-white);
}

.author-info {
    flex: 1;
}

.author-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.author-bio {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* 関連記事 */
.related-articles {
    padding: var(--spacing-lg) var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.related-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.related-card {
    background-color: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

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

.related-link {
    display: block;
}

.related-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
}

.related-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.related-card:hover .related-image img {
    transform: scale(1.1);
}

.related-content {
    padding: var(--spacing-sm) var(--spacing-md);
}

.related-category {
    display: inline-block;
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.related-article-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.5;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-date {
    font-size: 0.85rem;
    color: var(--color-text-lighter);
}

/* 前後の記事ナビゲーション */
.article-navigation {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.article-nav-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-base);
    border-radius: 8px;
    transition: var(--transition-base);
}

.article-nav-item:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.nav-label {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
    opacity: 0.8;
}

.nav-title {
    font-size: 0.95rem;
    font-weight: 600;
}

.article-nav-prev .nav-title,
.article-nav-next .nav-title {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-nav-list {
    justify-content: center;
    align-items: center;
    text-align: center;
}

/* 記事サイドバー */
.article-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-toc-fixed {
    position: sticky;
    top: 100px;
}

#sidebarTOC {
    max-height: 400px;
    overflow-y: auto;
}

#sidebarTOC ol {
    list-style: decimal;
    padding-left: 1.5rem;
    font-size: 0.9rem;
}

#sidebarTOC li {
    margin-bottom: 0.5rem;
}

#sidebarTOC a {
    color: var(--color-text);
    transition: var(--transition-base);
}

#sidebarTOC a:hover,
#sidebarTOC a.active {
    color: var(--color-accent);
}

/* ==========================================================================
   21. FAQ
   ========================================================================== */
.faq {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    transition: var(--transition-base);
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background-color: var(--color-white);
    text-align: left;
    cursor: pointer;
    transition: var(--transition-base);
}

.faq-question:hover {
    background-color: var(--color-base);
}

.faq-question-text {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-primary);
    flex: 1;
}

.faq-icon {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
    transition: transform var(--transition-base);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ==========================================================================
   22. フッター
   ========================================================================== */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.footer-logo i {
    font-size: 1.8rem;
    color: var(--color-accent);
}

.footer-description {
    font-size: 0.95rem;
    opacity: 0.9;
    line-height: 1.7;
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.social-link {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--color-white);
    font-size: 1.125rem;
    transition: var(--transition-base);
}

.social-link:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-links,
.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a,
.footer-contact a {
    opacity: 0.9;
    transition: var(--transition-base);
}

.footer-links a:hover,
.footer-contact a:hover {
    opacity: 1;
    color: var(--color-accent);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    opacity: 0.9;
}

.footer-contact i {
    color: var(--color-accent);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-copyright {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ==========================================================================
   23. トップへ戻るボタン
   ========================================================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(255, 107, 53, 0.4);
}

/* ==========================================================================
   24. レスポンシブデザイン
   ========================================================================== */
@media (max-width: 1024px) {
    .blog-page-layout,
    .article-layout {
        grid-template-columns: 1fr;
    }
    
    .blog-sidebar,
    .article-sidebar {
        order: -1;
    }
    
    .sidebar-toc-fixed {
        position: static;
    }
    
    .blog-list-link {
        grid-template-columns: 1fr;
    }
    
    .blog-list-image {
        height: 220px;
    }
    
    .article-navigation {
        grid-template-columns: 1fr;
    }
    
    .article-nav-list {
        order: -1;
    }
}

@media (max-width: 767px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav {
        position: fixed;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100vh;
        background-color: var(--color-primary);
        flex-direction: column;
        justify-content: center;
        padding: var(--spacing-lg);
        transition: left var(--transition-base);
    }
    
    .nav.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    
    .nav-link {
        font-size: 1.25rem;
        padding: var(--spacing-sm) 0;
    }
    
    .nav-cta {
        width: 100%;
        margin-top: var(--spacing-md);
    }
    
    .nav-cta .btn {
        width: 100%;
        justify-content: center;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
    
    .hero-stat-number {
        font-size: 2rem;
    }
    
    .article-featured-image {
        height: 300px;
    }
    
    .share-buttons {
        flex-wrap: wrap;
    }
    
    .article-share-bottom .share-btn span {
        display: none;
    }
    
    .article-share-bottom .share-btn {
        width: 45px;
        height: 45px;
        padding: 0;
        justify-content: center;
        border-radius: 50%;
    }
    
    .related-grid {
        grid-template-columns: 1fr;
    }
    
    .pagination {
        flex-wrap: wrap;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* ==========================================================================
   25. プリント用スタイル
   ========================================================================== */
@media print {
    .header,
    .breadcrumb,
    .hamburger,
    .article-share,
    .article-navigation,
    .related-articles,
    .article-sidebar,
    .footer,
    .back-to-top,
    .scroll-progress,
    .loader {
        display: none !important;
    }
    
    .article-page,
    .article-main {
        box-shadow: none;
        padding: 0;
        margin: 0;
    }
    
    body {
        background: white;
    }
}

/* ====================================
   固定ページ専用スタイル
==================================== */

/* ページヒーロー */
.page-hero {
    position: relative;
    height: 400px;
    overflow: hidden;
    margin-bottom: 60px;
}

.page-hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.page-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(26, 35, 50, 0.5), rgba(26, 35, 50, 0.8));
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-hero .page-title {
    font-size: 3rem;
    color: #ffffff;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    margin: 0;
}

/* ページヘッダー（画像なしの場合） */
.page-header {
    background: linear-gradient(135deg, #1a2332 0%, #2d3e50 100%);
    padding: 80px 0 60px;
    margin-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        repeating-linear-gradient(
            90deg,
            rgba(255, 255, 255, 0.03) 0px,
            rgba(255, 255, 255, 0.03) 1px,
            transparent 1px,
            transparent 20px
        ),
        repeating-linear-gradient(
            0deg,
            rgba(255, 255, 255, 0.03) 0px,
            rgba(255, 255, 255, 0.03) 1px,
            transparent 1px,
            transparent 20px
        );
    pointer-events: none;
}

.page-header .page-title {
    font-size: 2.5rem;
    color: #ffffff;
    text-align: center;
    margin: 0;
    position: relative;
    z-index: 1;
}

/* ページ本文 */
.page-body {
    padding: 40px 0 80px;
}

.page-content .entry-content {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.9;
}

.page-content .entry-content h2 {
    font-size: 2rem;
    color: #1a2332;
    margin: 60px 0 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid #ff6b35;
}

.page-content .entry-content h3 {
    font-size: 1.5rem;
    color: #1a2332;
    margin: 40px 0 20px;
    padding-left: 15px;
    border-left: 4px solid #ff6b35;
}

.page-content .entry-content p {
    margin-bottom: 1.5em;
}

.page-content .entry-content ul,
.page-content .entry-content ol {
    margin: 1.5em 0;
    padding-left: 2em;
}

.page-content .entry-content li {
    margin-bottom: 0.8em;
}

.page-content .entry-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 2em 0;
}

.page-content .entry-content blockquote {
    background: #f8f9fa;
    border-left: 4px solid #ff6b35;
    padding: 20px 30px;
    margin: 2em 0;
    font-style: italic;
}

/* ページリンク */
.page-links {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
}

.page-links-title {
    font-weight: bold;
    margin-right: 10px;
}

.page-links a {
    display: inline-block;
    padding: 8px 15px;
    margin: 0 5px;
    background: #1a2332;
    color: #ffffff;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.page-links a:hover {
    background: #ff6b35;
    transform: translateY(-2px);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .page-hero {
        height: 250px;
        margin-bottom: 40px;
    }

    .page-hero .page-title {
        font-size: 2rem;
    }

    .page-header {
        padding: 60px 0 40px;
        margin-bottom: 40px;
    }

    .page-header .page-title {
        font-size: 1.8rem;
    }

    .page-body {
        padding: 20px 0 60px;
    }

    .page-content .entry-content {
        font-size: 1rem;
        line-height: 1.8;
    }

    .page-content .entry-content h2 {
        font-size: 1.6rem;
        margin: 40px 0 20px;
    }

    .page-content .entry-content h3 {
        font-size: 1.3rem;
        margin: 30px 0 15px;
    }
}

/* 固定ページのコンテンツエリア修正 */
.main-content {
    min-height: calc(100vh - 200px);
    background: #ffffff;
    position: relative;
    z-index: 1;
}

.page-content .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
}

.page-header {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid #ff6b35;
}

.page-title {
    font-size: 2.5rem;
    color: #1a2332;
    margin: 0;
}

.entry-content {
    font-size: 1.1rem;
    line-height: 1.9;
    color: #333;
}

.entry-content h2 {
    font-size: 2rem;
    color: #1a2332;
    margin: 60px 0 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid #ff6b35;
}

.entry-content h3 {
    font-size: 1.5rem;
    color: #1a2332;
    margin: 40px 0 20px;
    padding-left: 15px;
    border-left: 4px solid #ff6b35;
}

.entry-content p {
    margin-bottom: 1.5em;
}

.entry-content ul,
.entry-content ol {
    margin: 1.5em 0;
    padding-left: 2em;
}

.entry-content li {
    margin-bottom: 0.8em;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .page-content .container {
        padding: 60px 15px;
    }

    .page-title {
        font-size: 1.8rem;
    }

    .entry-content {
        font-size: 1rem;
    }

    .entry-content h2 {
        font-size: 1.6rem;
    }

    .entry-content h3 {
        font-size: 1.3rem;
    }
}

/* ====================================
   固定ページスタイル
==================================== */

/* ページセクション */
.page-section {
    padding: 80px 0 100px;
    background: #ffffff;
    min-height: calc(100vh - 400px);
}

/* ページ記事 */
.page-article {
    max-width: 1000px;
    margin: 0 auto;
}

/* ページヘッダー */
.page-header {
    margin-bottom: 50px;
    padding-bottom: 30px;
    border-bottom: 3px solid #ff6b35;
    text-align: left;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a2332;
    margin: 0;
    line-height: 1.3;
}

/* ページコンテンツ */
.page-content {
    font-size: 1.1rem;
    line-height: 1.9;
    color: #333333;
}

.page-content > *:first-child {
    margin-top: 0;
}

.page-content > *:last-child {
    margin-bottom: 0;
}

.page-content p {
    margin-bottom: 1.5em;
}

.page-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #1a2332;
    margin: 60px 0 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid #ff6b35;
    line-height: 1.4;
}

.page-content h3 {
    font-size: 1.6rem;
    font-weight: 600;
    color: #1a2332;
    margin: 40px 0 20px;
    padding-left: 20px;
    border-left: 5px solid #ff6b35;
    line-height: 1.4;
}

.page-content h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1a2332;
    margin: 30px 0 15px;
    line-height: 1.4;
}

.page-content ul,
.page-content ol {
    margin: 1.5em 0;
    padding-left: 2em;
}

.page-content ul {
    list-style-type: disc;
}

.page-content ol {
    list-style-type: decimal;
}

.page-content li {
    margin-bottom: 0.8em;
    line-height: 1.8;
}

.page-content li > ul,
.page-content li > ol {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

.page-content a {
    color: #ff6b35;
    text-decoration: underline;
    transition: color 0.3s ease;
}

.page-content a:hover {
    color: #e55a2b;
}

.page-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 2em 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.page-content blockquote {
    background: #f8f9fa;
    border-left: 5px solid #ff6b35;
    padding: 20px 30px;
    margin: 2em 0;
    font-style: italic;
    color: #555;
}

.page-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 2em 0;
}

.page-content table th,
.page-content table td {
    padding: 12px 15px;
    border: 1px solid #ddd;
    text-align: left;
}

.page-content table th {
    background: #1a2332;
    color: #ffffff;
    font-weight: 600;
}

.page-content table tr:nth-child(even) {
    background: #f8f9fa;
}

/* ページリンク */
.page-links {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    font-size: 1rem;
}

.page-links-title {
    font-weight: 700;
    margin-right: 15px;
    color: #1a2332;
}

.page-links a {
    display: inline-block;
    padding: 10px 18px;
    margin: 0 5px;
    background: #1a2332;
    color: #ffffff;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.page-links a:hover {
    background: #ff6b35;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 107, 53, 0.3);
}

.page-links .current {
    display: inline-block;
    padding: 10px 18px;
    margin: 0 5px;
    background: #ff6b35;
    color: #ffffff;
    border-radius: 5px;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .page-section {
        padding: 60px 0 80px;
    }

    .page-header {
        margin-bottom: 30px;
        padding-bottom: 20px;
    }

    .page-title {
        font-size: 1.8rem;
    }

    .page-content {
        font-size: 1rem;
        line-height: 1.8;
    }

    .page-content h2 {
        font-size: 1.6rem;
        margin: 40px 0 20px;
        padding-bottom: 10px;
    }

    .page-content h3 {
        font-size: 1.3rem;
        margin: 30px 0 15px;
        padding-left: 15px;
        border-left-width: 4px;
    }

    .page-content h4 {
        font-size: 1.1rem;
        margin: 20px 0 10px;
    }

    .page-content ul,
    .page-content ol {
        padding-left: 1.5em;
    }

    .page-content blockquote {
        padding: 15px 20px;
        margin: 1.5em 0;
    }

    .page-content table {
        font-size: 0.9rem;
    }

    .page-content table th,
    .page-content table td {
        padding: 8px 10px;
    }

    .page-links {
        margin-top: 30px;
        padding-top: 20px;
    }

    .page-links a,
    .page-links .current {
        padding: 8px 12px;
        margin: 5px 3px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .page-section {
        padding: 40px 0 60px;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .page-content {
        font-size: 0.95rem;
    }

    .page-content h2 {
        font-size: 1.4rem;
    }

    .page-content h3 {
        font-size: 1.2rem;
    }

    .page-links-title {
        display: block;
        margin-bottom: 10px;
    }
}


    }/* ====================================
   固定ページスタイル
==================================== */

/* ページセクション */
.page-section {
    padding: 80px 0 100px;
    background: #ffffff;
    min-height: calc(100vh - 400px);
}

.page-article {
    max-width: 1000px;
    margin: 0 auto;
}

/* ページヘッダー */
.page-header {
    margin-bottom: 50px;
    padding-bottom: 30px;
    border-bottom: 3px solid #ff6b35;
    text-align: left;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a2332;
    margin: 0;
    line-height: 1.3;
}

/* ページコンテンツ */
.page-content {
    font-size: 1.1rem;
    line-height: 1.9;
    color: #333333;
}

.page-content > *:first-child {
    margin-top: 0;
}

.page-content > *:last-child {
    margin-bottom: 0;
}

.page-content p {
    margin-bottom: 1.5em;
}

.page-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #1a2332;
    margin: 60px 0 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid #ff6b35;
    line-height: 1.4;
}

.page-content h3 {
    font-size: 1.6rem;
    font-weight: 600;
    color: #1a2332;
    margin: 40px 0 20px;
    padding-left: 20px;
    border-left: 5px solid #ff6b35;
    line-height: 1.4;
}

.page-content h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1a2332;
    margin: 30px 0 15px;
    line-height: 1.4;
}

.page-content ul,
.page-content ol {
    margin: 1.5em 0;
    padding-left: 2em;
}

.page-content ul {
    list-style-type: disc;
}

.page-content ol {
    list-style-type: decimal;
}

.page-content li {
    margin-bottom: 0.8em;
    line-height: 1.8;
}

.page-content li > ul,
.page-content li > ol {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

.page-content a {
    color: #ff6b35;
    text-decoration: underline;
    transition: color 0.3s ease;
}

.page-content a:hover {
    color: #e55a2b;
}

.page-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 2em 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.page-content blockquote {
    background: #f8f9fa;
    border-left: 5px solid #ff6b35;
    padding: 20px 30px;
    margin: 2em 0;
    font-style: italic;
    color: #555;
}

.page-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 2em 0;
}

.page-content table th,
.page-content table td {
    padding: 12px 15px;
    border: 1px solid #ddd;
    text-align: left;
}

.page-content table th {
    background: #1a2332;
    color: #ffffff;
    font-weight: 600;
}

.page-content table tr:nth-child(even) {
    background: #f8f9fa;
}

/* ページリンク */
.page-links {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    font-size: 1rem;
}

.page-links-title {
    font-weight: 700;
    margin-right: 15px;
    color: #1a2332;
}

.page-links a {
    display: inline-block;
    padding: 10px 18px;
    margin: 0 5px;
    background: #1a2332;
    color: #ffffff;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.page-links a:hover {
    background: #ff6b35;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 107, 53, 0.3);
}

.page-links .current {
    display: inline-block;
    padding: 10px 18px;
    margin: 0 5px;
    background: #ff6b35;
    color: #ffffff;
    border-radius: 5px;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .page-section {
        padding: 60px 0 80px;
    }

    .page-header {
        margin-bottom: 30px;
        padding-bottom: 20px;
    }

    .page-title {
        font-size: 1.8rem;
    }

    .page-content {
        font-size: 1rem;
        line-height: 1.8;
    }

    .page-content h2 {
        font-size: 1.6rem;
        margin: 40px 0 20px;
        padding-bottom: 10px;
    }

    .page-content h3 {
        font-size: 1.3rem;
        margin: 30px 0 15px;
        padding-left: 15px;
        border-left-width: 4px;
    }

    .page-content h4 {
        font-size: 1.1rem;
        margin: 20px 0 10px;
    }

    .page-content ul,
    .page-content ol {
        padding-left: 1.5em;
    }

    .page-content blockquote {
        padding: 15px 20px;
        margin: 1.5em 0;
    }

    .page-content table {
        font-size: 0.9rem;
    }

    .page-content table th,
    .page-content table td {
        padding: 8px 10px;
    }

    .page-links {
        margin-top: 30px;
        padding-top: 20px;
    }

    .page-links a,
    .page-links .current {
        padding: 8px 12px;
        margin: 5px 3px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .page-section {
        padding: 40px 0 60px;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .page-content {
        font-size: 0.95rem;
    }

    .page-content h2 {
        font-size: 1.4rem;
    }

    .page-content h3 {
        font-size: 1.2rem;
    }

    .page-links-title {
        display: block;
        margin-bottom: 10px;
    }
}