# style.css（完全版）

```css
/*
Theme Name: USA Deep Dive
Theme URI: https://usadeepdive.com
Author: Yuki Nishida
Author URI: https://usadeepdive.com
Description: アメリカの最新トレンド、ビジネス、カルチャーを日本語で深く解説する情報メディアテーマ
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: usadeepdive
Tags: news, magazine, blog, two-columns, responsive-layout, custom-logo, custom-menu, featured-images
*/

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

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: #333333;
    background-color: #ffffff;
    line-height: 1.8;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

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

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

ul, ol {
    list-style: none;
}

/* ========================================
   Header
======================================== */
.site-header {
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.site-header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 80px;
}

.logo img {
    display: block;
}

.custom-logo {
    max-width: 300px;
    height: auto;
    display: block;
}

.footer-logo .custom-logo {
    max-width: 200px;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    gap: 35px;
    align-items: center;
}

.nav-menu li a {
    font-weight: 500;
    color: #333333;
    position: relative;
    padding: 5px 0;
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #cbd400;
    transition: width 0.3s ease;
}

.nav-menu li a:hover::after {
    width: 100%;
}

.btn-contact {
    background: #cbd400;
    color: #1a1a1a;
    padding: 10px 25px;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-contact:hover {
    background: #b8bf00;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(203, 212, 0, 0.3);
}

.btn-contact::after {
    display: none;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 30px;
    height: 25px;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 3px;
    background: #333333;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========================================
   Hero Section
======================================== */
.hero {
    position: relative;
    height: 600px;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('https://placehold.jp/cbd400/1a1a1a/1920x600.png?text=USA+Trends');
    background-size: cover;
    background-position: center;
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(203, 212, 0, 0.1) 0%, rgba(52, 73, 94, 0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #ffffff;
    max-width: 900px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 20px;
    line-height: 1.3;
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
    letter-spacing: 1px;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    font-weight: 400;
    opacity: 0.95;
}

.hero-badges {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 12px 25px;
    border-radius: 50px;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.badge i {
    color: #cbd400;
    margin-right: 8px;
}

.sp-only {
    display: none;
}

/* ========================================
   Main Content
======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 60px;
    padding: 80px 0;
}

.main-column {
    min-width: 0;
}

/* ========================================
   Breadcrumbs (Yoast SEO)
======================================== */
.breadcrumb-wrapper {
    margin-bottom: 30px;
}

.breadcrumbs {
    font-size: 0.9rem;
    color: #666666;
}

.breadcrumbs a {
    color: #666666;
    transition: color 0.3s ease;
}

.breadcrumbs a:hover {
    color: #cbd400;
}

.breadcrumbs span {
    margin: 0 8px;
}

/* ========================================
   Section Styles
======================================== */
.section {
    margin-bottom: 100px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header.centered {
    text-align: center;
}

.section-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, #cbd400 0%, #b8bf00 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #1a1a1a;
    box-shadow: 0 10px 30px rgba(203, 212, 0, 0.2);
}

.section-icon.light {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: #ffffff;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 15px;
    color: #1a1a1a;
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.section-title.light {
    color: #ffffff;
}

.section-subtitle {
    font-size: 1.1rem;
    color: #666666;
    font-weight: 500;
}

.section-subtitle.light {
    color: rgba(255, 255, 255, 0.9);
}

/* ========================================
   About Section
======================================== */
.section-about {
    background: #ffffff;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    margin-bottom: 60px;
    align-items: center;
}

.about-text p {
    margin-bottom: 20px;
    color: #555555;
    font-size: 1.05rem;
    line-height: 1.9;
}

.about-image {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: #f8f9fa;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: #cbd400;
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: #cbd400;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #1a1a1a;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #1a1a1a;
    font-weight: 700;
}

.feature-card p {
    color: #666666;
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   For Who Section
======================================== */
.section-for-who {
    position: relative;
    padding: 80px 0;
    margin-bottom: 100px;
}

.for-who-bg {
    position: absolute;
    top: 0;
    left: -100vw;
    right: -100vw;
    bottom: 0;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    z-index: -1;
}

.for-who-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23cbd400" fill-opacity="0.05" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,165.3C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
}

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

.target-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.target-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: 15px;
    position: relative;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.target-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    border-color: #cbd400;
}

.target-number {
    position: absolute;
    top: -15px;
    left: 30px;
    background: linear-gradient(135deg, #cbd400 0%, #b8bf00 100%);
    color: #1a1a1a;
    font-size: 1.2rem;
    font-weight: 900;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Montserrat', sans-serif;
    box-shadow: 0 5px 15px rgba(203, 212, 0, 0.3);
}

.target-icon {
    font-size: 2.5rem;
    color: #cbd400;
    margin-bottom: 20px;
}

.target-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #1a1a1a;
    font-weight: 700;
}

.target-card p {
    color: #555555;
    font-size: 1rem;
    line-height: 1.8;
}

/* ========================================
   News Section
======================================== */
.section-news {
    background: #ffffff;
}

.news-list {
    display: grid;
    gap: 35px;
    margin-bottom: 50px;
}

.news-item {
    background: #ffffff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
    border-color: #cbd400;
}

.news-link {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 0;
}

.news-thumbnail {
    position: relative;
    overflow: hidden;
    height: 250px;
}

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

.news-item:hover .news-thumbnail img {
    transform: scale(1.08);
}

.news-category {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    color: #ffffff;
    backdrop-filter: blur(5px);
}

.cat-tech {
    background: rgba(203, 212, 0, 0.9);
    color: #1a1a1a;
}

.cat-business {
    background: rgba(52, 73, 94, 0.9);
}

.cat-politics {
    background: rgba(231, 76, 60, 0.9);
}

.cat-culture {
    background: rgba(155, 89, 182, 0.9);
}

.cat-lifestyle {
    background: rgba(26, 188, 156, 0.9);
}

.cat-sports {
    background: rgba(230, 126, 34, 0.9);
}

.news-content {
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-date {
    color: #999999;
    font-size: 0.9rem;
    margin-bottom: 12px;
    display: inline-block;
}

.news-date i {
    margin-right: 5px;
    color: #cbd400;
}

.news-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: #1a1a1a;
    line-height: 1.5;
}

.news-excerpt {
    color: #666666;
    font-size: 0.95rem;
    line-height: 1.8;
}

.news-more {
    text-align: center;
    margin-top: 30px;
}

.btn-more {
    display: inline-block;
    padding: 15px 40px;
    background: #cbd400;
    color: #1a1a1a;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-more:hover {
    background: #b8bf00;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(203, 212, 0, 0.3);
}

.btn-more i {
    margin-left: 8px;
    transition: transform 0.3s ease;
}

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

/* ========================================
   Profile Section
======================================== */
.section-profile {
    background: #f8f9fa;
    padding: 60px 40px;
    border-radius: 20px;
}

.profile-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 50px;
    align-items: start;
}

.profile-image {
    position: relative;
}

.profile-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.profile-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #cbd400 0%, #b8bf00 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #1a1a1a;
    box-shadow: 0 8px 25px rgba(203, 212, 0, 0.4);
}

.profile-content {
    padding-top: 10px;
}

.profile-name {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 8px;
    color: #1a1a1a;
}

.profile-role {
    color: #cbd400;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 25px;
}

.profile-text p {
    margin-bottom: 20px;
    color: #555555;
    font-size: 1.05rem;
    line-height: 1.9;
}

.profile-stats {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid #e0e0e0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #666666;
    font-size: 0.95rem;
}

.stat-item i {
    color: #cbd400;
    font-size: 1.1rem;
}

/* ========================================
   Contact Section
======================================== */
.section-contact {
    position: relative;
    padding: 80px 0;
    margin-bottom: 0;
}

.contact-bg {
    position: absolute;
    top: 0;
    left: -100vw;
    right: -100vw;
    bottom: 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #2c3e50 100%);
    z-index: -1;
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

.contact-intro {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.05rem;
    line-height: 1.9;
    text-align: center;
    margin-bottom: 50px;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.contact-method {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.contact-method:hover {
    transform: translateY(-5px);
    border-color: #cbd400;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.method-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: #cbd400;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #1a1a1a;
}

.contact-method h4 {
    color: #ffffff;
    font-size: 1.3rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.contact-method p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    margin-bottom: 25px;
}

.btn-primary {
    display: inline-block;
    padding: 12px 35px;
    background: #cbd400;
    color: #1a1a1a;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: #b8bf00;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(203, 212, 0, 0.3);
}

.contact-email {
    color: #cbd400;
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: underline;
}

.contact-email:hover {
    color: #b8bf00;
}

/* ========================================
   Sidebar
======================================== */
.sidebar {
    position: relative;
}

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

.widget {
    background: #ffffff;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    border: 2px solid #f0f0f0;
    transition: all 0.3s ease;
}

.widget:hover {
    border-color: #cbd400;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.widget-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 25px;
    color: #1a1a1a;
    padding-bottom: 15px;
    border-bottom: 3px solid #cbd400;
}

/* Search Widget */
.search-form {
    display: flex;
    gap: 0;
    border: 2px solid #e0e0e0;
    border-radius: 50px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.search-form:focus-within {
    border-color: #cbd400;
    box-shadow: 0 0 0 3px rgba(203, 212, 0, 0.1);
}

.search-form input {
    flex: 1;
    padding: 12px 20px;
    border: none;
    outline: none;
    font-size: 0.95rem;
    font-family: inherit;
}

.search-form button {
    padding: 12px 20px;
    background: #cbd400;
    color: #1a1a1a;
    transition: all 0.3s ease;
}

.search-form button:hover {
    background: #b8bf00;
}

/* Categories Widget */
.category-list li {
    border-bottom: 1px solid #f0f0f0;
}

.category-list li:last-child {
    border-bottom: none;
}

.category-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    color: #555555;
    transition: all 0.3s ease;
}

.category-list a:hover {
    color: #cbd400;
    padding-left: 10px;
}

.category-list i {
    margin-right: 10px;
    color: #cbd400;
    font-size: 0.9rem;
}

.count {
    background: #f0f0f0;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: #666666;
    font-weight: 600;
}

/* Popular Posts Widget */
.popular-list li {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f0f0;
}

.popular-list li:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.popular-list a {
    display: flex;
    gap: 15px;
    transition: all 0.3s ease;
}

.popular-list a:hover {
    opacity: 0.8;
}

.popular-thumb {
    flex-shrink: 0;
    width: 100px;
    height: 70px;
    border-radius: 8px;
    overflow: hidden;
}

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

.popular-content h4 {
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 8px;
    color: #333333;
}

.popular-content time {
    font-size: 0.85rem;
    color: #999999;
}

.popular-content time i {
    color: #cbd400;
    margin-right: 5px;
}

/* Newsletter Widget */
.widget-newsletter {
    background: linear-gradient(135deg, #cbd400 0%, #b8bf00 100%);
    color: #1a1a1a;
    text-align: center;
}

.widget-newsletter .widget-title {
    color: #1a1a1a;
    border-bottom-color: rgba(26, 26, 26, 0.2);
}

.newsletter-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.widget-newsletter p {
    margin-bottom: 20px;
    font-weight: 500;
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.newsletter-form input {
    padding: 12px 20px;
    border: 2px solid rgba(26, 26, 26, 0.2);
    border-radius: 50px;
    outline: none;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.newsletter-form input:focus {
    border-color: #1a1a1a;
}

.btn-subscribe {
    padding: 12px 20px;
    background: #1a1a1a;
    color: #cbd400;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-subscribe:hover {
    background: #2c3e50;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.newsletter-note {
    font-size: 0.85rem;
    margin-top: 10px;
    margin-bottom: 0;
    opacity: 0.9;
}

.newsletter-note i {
    margin-right: 5px
}

/* Tags Widget */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    display: inline-block;
    padding: 8px 18px;
    background: #f0f0f0;
    color: #555555;
    border-radius: 50px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tag:hover {
    background: #cbd400;
    color: #1a1a1a;
    transform: translateY(-2px);
}

/* Banner Widget */
.widget-banner {
    padding: 0;
    border: none;
    box-shadow: none;
}

.widget-banner:hover {
    border: none;
}

.banner-link {
    display: block;
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.banner-link:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

/* ========================================
   Single Post Styles
======================================== */
.single-article {
    background: #ffffff;
    padding: 60px;
    border-radius: 20px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.08);
    margin-bottom: 60px;
}

.article-header {
    margin-bottom: 40px;
}

.article-meta-top {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 25px;
}

.article-category {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 700;
    color: #ffffff;
}

.article-date,
.article-modified {
    font-size: 0.9rem;
    color: #999999;
}

.article-date i,
.article-modified i {
    margin-right: 5px;
    color: #cbd400;
}

.article-title {
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1.4;
    color: #1a1a1a;
    margin-bottom: 25px;
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.article-meta-bottom {
    padding-top: 20px;
    border-top: 2px solid #f0f0f0;
}

.article-tags {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.article-tags i {
    color: #cbd400;
    font-size: 1.1rem;
}

.article-tag {
    display: inline-block;
    padding: 6px 16px;
    background: #f0f0f0;
    color: #555555;
    border-radius: 50px;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.article-tag:hover {
    background: #cbd400;
    color: #1a1a1a;
}

.article-thumbnail {
    margin-bottom: 40px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.article-thumbnail img {
    width: 100%;
    height: auto;
    display: block;
}

.article-content {
    font-size: 1.1rem;
    line-height: 1.9;
    color: #333333;
}

.article-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-top: 50px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #cbd400;
    color: #1a1a1a;
}

.article-content h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.article-content h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-top: 30px;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.article-content p {
    margin-bottom: 25px;
}

.article-content ul,
.article-content ol {
    margin-bottom: 25px;
    padding-left: 30px;
}

.article-content ul li,
.article-content ol li {
    margin-bottom: 10px;
    line-height: 1.8;
}

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

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

.article-content blockquote {
    background: #f8f9fa;
    border-left: 5px solid #cbd400;
    padding: 25px 30px;
    margin: 30px 0;
    font-style: italic;
    color: #555555;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 30px 0;
}

.article-content a {
    color: #cbd400;
    text-decoration: underline;
}

.article-content a:hover {
    color: #b8bf00;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
}

.article-content table th,
.article-content table td {
    padding: 12px 15px;
    border: 1px solid #e0e0e0;
    text-align: left;
}

.article-content table th {
    background: #f8f9fa;
    font-weight: 700;
}

.article-footer {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 2px solid #f0f0f0;
}

.article-footer-tags {
    margin-bottom: 40px;
}

.footer-tags-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.footer-tags-title i {
    color: #cbd400;
    margin-right: 8px;
}

.footer-tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-tag {
    display: inline-block;
    padding: 10px 22px;
    background: #f0f0f0;
    color: #555555;
    border-radius: 50px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.footer-tag:hover {
    background: #cbd400;
    color: #1a1a1a;
    transform: translateY(-2px);
}

.article-share {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
}

.share-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.share-title i {
    color: #cbd400;
    margin-right: 8px;
}

.share-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.95rem;
    color: #ffffff;
    transition: all 0.3s ease;
}

.share-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.share-twitter {
    background: #1DA1F2;
}

.share-facebook {
    background: #1877F2;
}

.share-line {
    background: #00B900;
}

.share-hatena {
    background: #00A4DE;
}

/* Post Navigation */
.post-navigation {
    margin-top: 60px;
    margin-bottom: 60px;
}

.nav-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.nav-previous,
.nav-next {
    background: #ffffff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.nav-previous:hover,
.nav-next:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
    border-color: #cbd400;
}

.nav-link {
    display: block;
    padding: 25px;
}

.nav-direction {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: #cbd400;
    margin-bottom: 15px;
}

.nav-direction i {
    font-size: 0.8rem;
}

.nav-post {
    display: flex;
    gap: 15px;
    align-items: center;
}

.nav-thumb {
    flex-shrink: 0;
    width: 100px;
    height: 70px;
    border-radius: 8px;
    overflow: hidden;
}

.nav-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.nav-content {
    flex: 1;
}

.nav-title {
    font-size: 1rem;
    font-weight: 700;
    color: #333333;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Related Posts */
.related-posts {
    margin-top: 60px;
    padding: 50px;
    background: #f8f9fa;
    border-radius: 20px;
}

.related-title {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 40px;
    color: #1a1a1a;
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.related-title i {
    color: #cbd400;
    margin-right: 10px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.related-item {
    background: #ffffff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.related-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
    border-color: #cbd400;
}

.related-link {
    display: block;
}

.related-thumbnail {
    position: relative;
    height: 200px;
    overflow: hidden;
}

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

.related-item:hover .related-thumbnail img {
    transform: scale(1.08);
}

.related-category {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    color: #ffffff;
    backdrop-filter: blur(5px);
}

.related-content {
    padding: 20px;
}

.related-date {
    display: block;
    font-size: 0.85rem;
    color: #999999;
    margin-bottom: 10px;
}

.related-date i {
    color: #cbd400;
    margin-right: 5px;
}

.related-title-text {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.5;
    color: #333333;
}

/* ========================================
   Page Styles
======================================== */
.page-article {
    background: #ffffff;
    padding: 60px;
    border-radius: 20px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.08);
    margin-bottom: 60px;
}

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

.page-title {
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1.4;
    color: #1a1a1a;
    margin-bottom: 30px;
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.page-thumbnail {
    margin-bottom: 40px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.page-thumbnail img {
    width: 100%;
    height: auto;
    display: block;
}

.page-content {
    font-size: 1.1rem;
    line-height: 1.9;
    color: #333333;
}

.page-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-top: 50px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #cbd400;
    color: #1a1a1a;
}

.page-content h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.page-content p {
    margin-bottom: 25px;
}

.page-content ul,
.page-content ol {
    margin-bottom: 25px;
    padding-left: 30px;
}

.page-content ul li,
.page-content ol li {
    margin-bottom: 10px;
    line-height: 1.8;
}

/* ========================================
   Archive Styles
======================================== */
.archive-header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    padding: 60px 50px;
    border-radius: 20px;
    margin-bottom: 50px;
    position: relative;
    overflow: hidden;
}

.archive-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23cbd400" fill-opacity="0.05" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,165.3C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
}

.archive-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #ffffff;
}

.archive-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: rgba(203, 212, 0, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #cbd400;
}

.archive-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 15px;
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.archive-description {
    font-size: 1.1rem;
    margin-bottom: 20px;
    opacity: 0.9;
    line-height: 1.8;
}

.archive-count {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 10px 25px;
    border-radius: 50px;
    font-weight: 700;
}

.archive-count i {
    color: #cbd400;
    margin-right: 8px;
}

.archive-content {
    margin-bottom: 60px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 60px;
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 45px;
    height: 45px;
    padding: 0 15px;
    background: #ffffff;
    color: #333333;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid #e0e0e0;
}

.pagination a:hover {
    background: #cbd400;
    color: #1a1a1a;
    border-color: #cbd400;
    transform: translateY(-2px);
}

.pagination .current {
    background: #cbd400;
    color: #1a1a1a;
    border-color: #cbd400;
}

.pagination .dots {
    background: transparent;
    border: none;
    color: #999999;
}

/* No Posts */
.no-posts {
    text-align: center;
    padding: 80px 40px;
    background: #f8f9fa;
    border-radius: 20px;
}

.no-posts-icon {
    font-size: 5rem;
    color: #cbd400;
    margin-bottom: 30px;
}

.no-posts-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.no-posts-text {
    font-size: 1.1rem;
    color: #666666;
    margin-bottom: 40px;
    line-height: 1.8;
}

.btn-home {
    display: inline-block;
    padding: 15px 40px;
    background: #cbd400;
    color: #1a1a1a;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-home:hover {
    background: #b8bf00;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(203, 212, 0, 0.3);
}

.btn-home i {
    margin-right: 8px;
}

/* ========================================
   404 Error Page Styles
======================================== */
.error-404 {
    padding: 60px 0;
}

.error-404-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.error-404-icon {
    font-size: 8rem;
    color: #cbd400;
    margin-bottom: 30px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.error-404-title {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 20px;
    color: #1a1a1a;
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.error-404-text {
    font-size: 1.2rem;
    color: #666666;
    margin-bottom: 60px;
    line-height: 1.8;
}

.error-404-search {
    max-width: 600px;
    margin: 0 auto 80px;
    padding: 40px;
    background: #f8f9fa;
    border-radius: 20px;
}

.search-heading {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.search-description {
    color: #666666;
    margin-bottom: 25px;
}

.search-form-large {
    display: flex;
    gap: 0;
    border: 2px solid #e0e0e0;
    border-radius: 50px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.search-form-large:focus-within {
    border-color: #cbd400;
    box-shadow: 0 0 0 4px rgba(203, 212, 0, 0.1);
}

.search-form-large input {
    flex: 1;
    padding: 15px 25px;
    border: none;
    outline: none;
    font-size: 1rem;
    font-family: inherit;
}

.search-form-large button {
    padding: 15px 35px;
    background: #cbd400;
    color: #1a1a1a;
    font-weight: 700;
    transition: all 0.3s ease;
}

.search-form-large button:hover {
    background: #b8bf00;
}

.error-404-links {
    margin-bottom: 80px;
}

.links-heading {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
    color: #1a1a1a;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.link-card {
    background: #ffffff;
    padding: 30px 20px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.link-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
    border-color: #cbd400;
}

.link-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: #cbd400;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #1a1a1a;
}

.link-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #1a1a1a;
}

.link-card p {
    font-size: 0.9rem;
    color: #666666;
}

.error-404-recent {
    margin-bottom: 60px;
}

.recent-heading {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
    color: #1a1a1a;
}

.recent-heading i {
    color: #cbd400;
    margin-right: 10px;
}

.recent-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.recent-item {
    background: #ffffff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.recent-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
    border-color: #cbd400;
}

.recent-link {
    display: block;
}

.recent-thumbnail {
    position: relative;
    height: 200px;
    overflow: hidden;
}

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

.recent-item:hover .recent-thumbnail img {
    transform: scale(1.08);
}

.recent-category {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    color: #ffffff;
    backdrop-filter: blur(5px);
}

.recent-content {
    padding: 20px;
}

.recent-date {
    display: block;
    font-size: 0.85rem;
    color: #999999;
    margin-bottom: 10px;
}

.recent-date i {
    color: #cbd400;
    margin-right: 5px;
}

.recent-title {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.5;
    color: #333333;
}

/* ========================================
   Footer
======================================== */
.site-footer {
    background: #1a1a1a;
    color: #ffffff;
}

.footer-top {
    padding: 80px 0 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
}

.footer-logo {
    margin-bottom: 25px;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 30px;
    font-size: 0.95rem;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social a {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background: #cbd400;
    color: #1a1a1a;
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 25px;
    color: #ffffff;
}

.footer-menu li {
    margin-bottom: 12px;
}

.footer-menu a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.footer-menu a:hover {
    color: #cbd400;
    padding-left: 5px;
}

.footer-bottom {
    padding: 25px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.copyright {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* ========================================
   Scroll to Top Button
======================================== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #cbd400;
    color: #1a1a1a;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 5px 20px rgba(203, 212, 0, 0.3);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: #b8bf00;
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(203, 212, 0, 0.4);
}

/* ========================================
   Responsive Design
======================================== */

/* Tablet */
@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 1fr 300px;
        gap: 40px;
    }

features-grid {
        grid-template-columns: 1fr;
    }

    .target-grid {
        grid-template-columns: 1fr;
    }

    .news-link {
        grid-template-columns: 300px 1fr;
    }

    .news-thumbnail {
        height: 200px;
    }

    .profile-container {
        grid-template-columns: 250px 1fr;
        gap: 40px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .footer-about {
        grid-column: 1 / -1;
    }

    .single-article,
    .page-article {
        padding: 40px;
    }
    
    .related-grid,
    .recent-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-links {
        grid-template-columns: 1fr;
    }
    
    .links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .sp-only {
        display: inline;
    }

    .header-container {
        min-height: 70px;
    }

    .logo img {
        width: 200px;
        height: auto;
    }

    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: #ffffff;
        flex-direction: column;
        gap: 0;
        padding: 30px 20px;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        transition: all 0.3s ease;
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-menu li a {
        display: block;
        padding: 15px;
    }

    .btn-contact {
        margin-top: 20px;
        display: inline-block;
    }

    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 60px;
        padding: 60px 0;
    }

    .sidebar {
        order: -1;
    }

    .sidebar-sticky {
        position: static;
    }

    .section {
        margin-bottom: 80px;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-icon {
        width: 70px;
        height: 70px;
        font-size: 1.8rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .about-image {
        order: -1;
    }

    .news-link {
        grid-template-columns: 1fr;
    }

    .news-thumbnail {
        height: 250px;
    }

    .profile-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .profile-image {
        max-width: 250px;
        margin: 0 auto;
    }

    .profile-stats {
        flex-direction: column;
        gap: 15px;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-about {
        grid-column: 1;
    }

    .scroll-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }

    .single-article,
    .page-article {
        padding: 30px 20px;
    }
    
    .article-title,
    .page-title {
        font-size: 1.8rem;
    }
    
    .article-content,
    .page-content {
        font-size: 1rem;
    }
    
    .article-content h2,
    .page-content h2 {
        font-size: 1.6rem;
    }
    
    .article-content h3,
    .page-content h3 {
        font-size: 1.3rem;
    }
    
    .related-grid,
    .recent-grid {
        grid-template-columns: 1fr;
    }
    
    .archive-header {
        padding: 40px 30px;
    }
    
    .archive-title {
        font-size: 2rem;
    }
    
    .error-404-title {
        font-size: 2rem;
    }
    
    .error-404-icon {
        font-size: 5rem;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .share-buttons {
        flex-direction: column;
    }
    
    .share-btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        height: 500px;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-badges {
        flex-direction: column;
        align-items: stretch;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    .widget {
        padding: 20px;
    }

    .news-title {
        font-size: 1.2rem;
    }

    .target-card {
        padding: 30px 25px;
    }

    .footer-top {
        padding: 60px 0 40px;
    }

    .article-meta-top {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav-post {
        flex-direction: column;
    }
    
    .nav-thumb {
        width: 100%;
        height: 150px;
    }
}

/* ========================================
   WordPress Core Classes Support
======================================== */

.alignleft {
    float: left;
    margin: 0 30px 20px 0;
}

.alignright {
    float: right;
    margin: 0 0 20px 30px;
}

.aligncenter {
    display: block;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.alignnone {
    margin: 20px 0;
}

.wp-caption {
    max-width: 100%;
}

.wp-caption-text {
    font-size: 0.9rem;
    color: #666666;
    margin-top: 10px;
    text-align: center;
    font-style: italic;
}

.gallery {
    margin-bottom: 30px;
}

.gallery-item {
    display: inline-block;
    text-align: center;
    vertical-align: top;
    width: 100%;
    padding: 10px;
}

.gallery-columns-2 .gallery-item {
    max-width: 50%;
}

.gallery-columns-3 .gallery-item {
    max-width: 33.33%;
}

.gallery-columns-4 .gallery-item {
    max-width: 25%;
}

.gallery-caption {
    font-size: 0.85rem;
    color: #666666;
    margin-top: 5px;
}

.sticky {
    /* スティッキー投稿用のスタイル */
}

.bypostauthor {
    /* 投稿者コメント用のスタイル */
}

.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
    word-wrap: normal !important;
}

.screen-reader-text:focus {
    background-color: #f1f1f1;
    border-radius: 3px;
    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
    clip: auto !important;
    color: #21759b;
    display: block;
    font-size: 14px;
    font-weight: bold;
    height: auto;
    left: 5px;
    line-height: normal;
    padding: 15px 23px 14px;
    text-decoration: none;
    top: 5px;
    width: auto;
    z-index: 100000;
}

/* ========================================
   Print Styles
======================================== */

@media print {
    .site-header,
    .sidebar,
    .site-footer,
    .scroll-top,
    .share-buttons,
    .post-navigation,
    .related-posts {
        display: none;
    }

    .content-wrapper {
        grid-template-columns: 1fr;
    }

    body {
        font-size: 12pt;
        line-height: 1.6;
        color: #000;
        background: #fff;
    }

    a {
        text-decoration: underline;
    }

    .article-content img,
    .page-content img {
        max-width: 100% !important;
        page-break-inside: avoid;
    }

    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
        page-break-inside: avoid;
    }

    blockquote, table, pre {
        page-break-inside: avoid;
    }

    .article-title,
    .page-title {
        font-size: 18pt;
    }
}

/* ========================================
   Accessibility Improvements
======================================== */

:focus {
    outline: 2px solid #cbd400;
    outline-offset: 2px;
}

a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid #cbd400;
    outline-offset: 2px;
}

/* Skip to content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #cbd400;
    color: #1a1a1a;
    padding: 10px 20px;
    text-decoration: none;
    z-index: 100000;
    font-weight: 700;
}

.skip-link:focus {
    top: 0;
}

/* ========================================
   Custom Utilities
======================================== */

.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

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

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-0 { margin-top: 0; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }
.mt-50 { margin-top: 50px; }

.mb-0 { margin-bottom: 0; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }
.mb-40 { margin-bottom: 40px; }
.mb-50 { margin-bottom: 50px; }

.pt-0 { padding-top: 0; }
.pt-10 { padding-top: 10px; }
.pt-20 { padding-top: 20px; }
.pt-30 { padding-top: 30px; }
.pt-40 { padding-top: 40px; }
.pt-50 { padding-top: 50px; }

.pb-0 { padding-bottom: 0; }
.pb-10 { padding-bottom: 10px; }
.pb-20 { padding-bottom: 20px; }
.pb-30 { padding-bottom: 30px; }
.pb-40 { padding-bottom: 40px; }
.pb-50 { padding-bottom: 50px; }

/* ========================================
   Animation Classes
======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideInUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideInDown {
    from {
        transform: translateY(-30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

.slide-in-up {
    animation: slideInUp 0.6s ease-out;
}

.slide-in-down {
    animation: slideInDown 0.6s ease-out;
}