/*
Theme Name: Data Analysis Lab
Theme URI: https://example.com/data-analysis-lab
Author: Your Name
Author URI: https://example.com
Description: GA4とデータ分析に特化した専門ブログテーマ。5つの記事タイプ、トピッククラスター構造、SEO最適化、コードハイライト機能を搭載。
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: data-analysis-lab
Tags: blog, analytics, data-science, two-columns, responsive-design, custom-header, custom-menu, editor-style, featured-images, sticky-post, threaded-comments
*/

/* ========================================
   CSS Variables (Design System)
   ======================================== */
:root {
    /* Primary Colors */
    --primary-blue: #2563eb;
    --primary-blue-dark: #1e40af;
    --primary-blue-light: #3b82f6;

    /* Secondary Colors */
    --secondary-green: #10b981;
    --secondary-purple: #8b5cf6;
    --secondary-orange: #f59e0b;

    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
        'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji',
        'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas,
        'Liberation Mono', monospace;
    --font-ja: 'Hiragino Kaku Gothic ProN', 'ヒラギノ角ゴ ProN W3', Meiryo,
        メイリオ, sans-serif;

    /* Font Sizes */
    --text-xs: 0.75rem; /* 12px */
    --text-sm: 0.875rem; /* 14px */
    --text-base: 1rem; /* 16px */
    --text-lg: 1.125rem; /* 18px */
    --text-xl: 1.25rem; /* 20px */
    --text-2xl: 1.5rem; /* 24px */
    --text-3xl: 1.875rem; /* 30px */
    --text-4xl: 2.25rem; /* 36px */
    --text-5xl: 3rem; /* 48px */

    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;
    --leading-loose: 2;

    /* Spacing */
    --space-1: 0.25rem; /* 4px */
    --space-2: 0.5rem; /* 8px */
    --space-3: 0.75rem; /* 12px */
    --space-4: 1rem; /* 16px */
    --space-5: 1.25rem; /* 20px */
    --space-6: 1.5rem; /* 24px */
    --space-8: 2rem; /* 32px */
    --space-10: 2.5rem; /* 40px */
    --space-12: 3rem; /* 48px */
    --space-16: 4rem; /* 64px */

    /* Border Radius */
    --radius-sm: 0.25rem; /* 4px */
    --radius-md: 0.375rem; /* 6px */
    --radius-lg: 0.5rem; /* 8px */
    --radius-xl: 0.75rem; /* 12px */
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Layout */
    --container-max-width: 1280px;
    --content-max-width: 800px;
    --sidebar-width: 320px;

    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans), var(--font-ja);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--gray-900);
    background-color: var(--gray-50);
}

/* Prevent horizontal overflow from full-bleed sections (100vw) */
html,
body {
    overflow-x: hidden;
}

@supports (overflow-x: clip) {
    html,
    body {
        overflow-x: clip;
    }
}

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: var(--leading-tight);
    margin-bottom: var(--space-4);
    color: var(--gray-900);
}

h1 {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-6);
}

h2 {
    font-size: var(--text-3xl);
    margin-top: var(--space-12);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-3);
    border-bottom: 3px solid var(--primary-blue);
}

h3 {
    font-size: var(--text-2xl);
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
    padding-left: var(--space-3);
    border-left: 4px solid var(--primary-blue);
}

h4 {
    font-size: var(--text-xl);
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
}

h5 {
    font-size: var(--text-lg);
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
}

h6 {
    font-size: var(--text-base);
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
}

/* ========================================
   Table of Contents numbering (Sidebar TOC)
   - H2: 1. / 2. ...
   - H3: 1.1 / 1.2 ...
   ======================================== */
.toc-list {
    counter-reset: toc-h2;
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.toc-list .toc-h2 {
    counter-increment: toc-h2;
    counter-reset: toc-h3;
}

.toc-list .toc-h2 .toc-link::before {
    content: counter(toc-h2) ". ";
    color: var(--gray-500);
    font-weight: 800;
}

.toc-list .toc-h3 {
    counter-increment: toc-h3;
}

.toc-list .toc-h3 .toc-link::before {
    content: counter(toc-h2) "." counter(toc-h3) " ";
    color: var(--gray-500);
    font-weight: 800;
}

.toc-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
}

.toc-link {
    display: inline-block;
    padding: 0.4rem 0;
    color: var(--gray-800);
    text-decoration: none;
    font-size: var(--text-sm);
    line-height: 1.4;
}

.toc-link:hover {
    color: var(--primary-blue-dark);
    text-decoration: none;
}

.toc-link.active {
    color: var(--primary-blue-dark);
    font-weight: 800;
}

.toc-toggle {
    flex: 0 0 auto;
    width: 28px;
    height: 28px;
    border-radius: 999px;
    border: 1px solid var(--gray-200);
    background-color: white;
    cursor: pointer;
    position: relative;
}

.toc-toggle::before {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--gray-500);
    border-bottom: 2px solid var(--gray-500);
    transform: rotate(45deg);
    top: -2px;
}

.toc-h2.is-expanded > .toc-row .toc-toggle::before {
    transform: rotate(-135deg);
    top: 2px;
}

.toc-sublist {
    list-style: none;
    padding-left: var(--space-4);
    margin: 0 0 var(--space-2);
    border-left: 2px solid var(--gray-200);
}

/* Mobile TOC placement (after lead paragraph) */
.toc-mobile {
    display: none; /* only on small screens */
    margin: var(--space-6) 0;
    padding: var(--space-5);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    background-color: white;
    box-shadow: var(--shadow-sm);
}

.toc-mobile-title {
    margin: 0 0 var(--space-3);
    font-size: var(--text-base);
    border-bottom: 0;
    padding-bottom: 0;
    color: var(--gray-900);
}

@media (max-width: 1023px) {
    .toc-mobile {
        display: block;
    }

    /* Avoid duplicated TOC: hide sidebar TOC widget on small screens */
    .sidebar .widget-toc {
        display: none;
    }
}

p {
    margin-bottom: var(--space-6);
    line-height: var(--leading-relaxed);
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

strong,
b {
    font-weight: 700;
}

em,
i {
    font-style: italic;
}

/* ========================================
   Lists
   ======================================== */
ul,
ol {
    margin-bottom: var(--space-6);
    padding-left: var(--space-8);
}

ul li,
ol li {
    margin-bottom: var(--space-3);
    line-height: var(--leading-relaxed);
}

ul {
    list-style-type: disc;
}

ol {
    list-style-type: decimal;
}

/* ========================================
   Code Blocks
   ======================================== */
code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--gray-100);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    color: var(--gray-800);
}

pre {
    background-color: var(--gray-900);
    color: var(--gray-100);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin-bottom: var(--space-6);
    position: relative;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
    font-size: var(--text-sm);
    line-height: var(--leading-loose);
}

/* Code Copy Button */
.code-copy-button {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    background-color: var(--gray-700);
    color: var(--gray-100);
    border: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.code-copy-button:hover {
    background-color: var(--gray-600);
}

/* ========================================
   Tables
   ======================================== */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-8);
    overflow-x: auto;
    display: block;
}

thead {
    background-color: var(--gray-100);
}

th {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-weight: 700;
    border-bottom: 2px solid var(--gray-300);
}

td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--gray-200);
}

tr:hover {
    background-color: var(--gray-50);
}

/* ========================================
   Images
   ======================================== */
img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
}

figure {
    margin-bottom: var(--space-8);
}

figcaption {
    font-size: var(--text-sm);
    color: var(--gray-600);
    text-align: center;
    margin-top: var(--space-2);
}

/* ========================================
   Blockquotes
   ======================================== */
blockquote {
    border-left: 4px solid var(--primary-blue);
    padding-left: var(--space-6);
    margin: var(--space-8) 0;
    font-style: italic;
    color: var(--gray-700);
    background-color: var(--gray-50);
    padding: var(--space-6);
    border-radius: var(--radius-md);
}

/* ========================================
   Anchor jump offsets (sticky header)
   ======================================== */
.entry-content h2,
.entry-content h3 {
    scroll-margin-top: 120px; /* fallback for native hash jumps */
}

/* ========================================
   Layout
   ======================================== */
.site-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* Generic container used in front-page.php */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.site-header {
    background-color: white;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-sm);
}

/* Desktop: make header full-width so nav/search sit closer to screen edge */
@media (min-width: 1024px) {
    .site-header .site-container {
        max-width: none;
        padding-left: var(--space-6);
        padding-right: var(--space-6);
    }
}

.site-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin-top: var(--space-8);
    margin-bottom: var(--space-16);
}

@media (min-width: 1024px) {
    body.has-sidebar .site-main {
        grid-template-columns: 1fr var(--sidebar-width);
    }
}

.content-area {
    background-color: white;
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

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

/* Single: allow scrolling within sidebar so long TOC is fully reachable */
@media (min-width: 1024px) {
    body.single .sidebar {
        max-height: calc(100vh - 120px); /* 100px top + a bit of breathing room */
        overflow-y: auto;
        overscroll-behavior: contain;
        -webkit-overflow-scrolling: touch;
        padding-right: var(--space-2); /* keep content off the scrollbar */
    }
}

/* ========================================
   Home Sections
   ======================================== */
.hero-section {
    position: relative;
    overflow: hidden;
    /* Full-bleed (edge-to-edge) */
    width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    border-radius: 0;
    background: #eef2f7;
    margin-top: calc(-1 * var(--space-8)); /* cancel .content-area padding */
    padding: clamp(48px, 6vw, 88px) var(--space-6);
    margin-bottom: var(--space-10);
}

.hero-section::before {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0.25;
    background-repeat: no-repeat;
    background-position: right 12% center;
    background-size: min(780px, 75%);
    /* Subtle chart illustration (inline SVG) */
    background-image: url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='900'%20height='420'%20viewBox='0%200%20900%20420'%3E%3Cg%20fill='none'%20stroke='%2399a3b2'%20stroke-width='2'%20opacity='0.55'%3E%3Cpath%20d='M70%20320%20L170%20260%20L280%20290%20L380%20220%20L500%20240%20L630%20170%20L760%20195%20L840%20140'/%3E%3Cpath%20d='M70%20320%20L70%20350%20M170%20260%20L170%20350%20M280%20290%20L280%20350%20M380%20220%20L380%20350%20M500%20240%20L500%20350%20M630%20170%20L630%20350%20M760%20195%20L760%20350%20M840%20140%20L840%20350'/%3E%3C/g%3E%3Cg%20fill='%23c7cdd6'%20opacity='0.55'%3E%3Crect%20x='110'%20y='280'%20width='36'%20height='70'/%3E%3Crect%20x='220'%20y='300'%20width='36'%20height='50'/%3E%3Crect%20x='330'%20y='250'%20width='36'%20height='100'/%3E%3Crect%20x='450'%20y='270'%20width='36'%20height='80'/%3E%3Crect%20x='580'%20y='220'%20width='36'%20height='130'/%3E%3Crect%20x='710'%20y='240'%20width='36'%20height='110'/%3E%3Crect%20x='810'%20y='190'%20width='36'%20height='160'/%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(26px, 3.2vw, 40px);
    line-height: 1.25;
    margin-bottom: var(--space-4);
}

.hero-subtitle {
    color: var(--gray-700);
    font-size: var(--text-sm);
    margin-bottom: var(--space-6);
}

@media (max-width: 768px) {
    .hero-section {
        margin-top: calc(-1 * var(--space-4)); /* matches mobile .content-area padding */
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
}

/* Section headings on home (e.g. FEATURED ARTICLES) */
h2.section-title {
    border-bottom: 0;
    padding-bottom: 0;
    margin-top: var(--space-10);
    margin-bottom: var(--space-4);
    font-size: var(--text-xl);
    letter-spacing: 0.02em;
    text-transform: none;
    color: var(--primary-blue-dark);
    position: relative;
    padding-left: 14px;
}

/* Accent bar for section headings */
h2.section-title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.2em;
    width: 4px;
    height: 1.1em;
    background-color: var(--primary-blue);
    border-radius: 2px;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .featured-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .featured-grid {
        grid-template-columns: 1fr;
    }
}

/* Make featured thumbnails a bit shorter */
.featured-grid .card-image {
    height: 160px;
    margin-bottom: 0;
    border-radius: 0;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xs);
    color: var(--gray-500);
    margin-top: var(--space-4);
}

.latest-articles {
    margin-top: var(--space-10);
}

.article-list {
    display: flex;
    flex-direction: column;
}

.article-list-item {
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
    padding: var(--space-4) 0;
    border-top: 1px solid var(--gray-200);
}

.article-list-item:first-child {
    border-top: 0;
}

.article-thumbnail {
    flex: 0 0 96px;
}

.article-thumbnail img {
    width: 96px;
    height: 64px;
    object-fit: cover;
    margin-bottom: 0; /* override global img margin */
    border-radius: var(--radius-md);
}

.article-content {
    flex: 1 1 auto;
    min-width: 0;
}

.article-header {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    margin-bottom: var(--space-2);
}

.article-title {
    margin: 0 0 var(--space-2);
    font-size: var(--text-base);
}

.article-title a {
    color: var(--gray-900);
}

.article-title a:hover {
    color: var(--primary-blue);
    text-decoration: none;
}

.article-excerpt {
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
    color: var(--gray-600);
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--text-xs);
    color: var(--gray-500);
}

/* ========================================
   Sidebar widgets (card look)
   ======================================== */
.sidebar .widget {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-6);
}

.sidebar .widget-title {
    margin-top: 0;
    margin-bottom: var(--space-4);
    padding-left: 0;
    border-left: 0;
    font-size: var(--text-base);
    color: var(--gray-900);
}

.sidebar ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

/* Category widget: ensure bullets/markers are removed */
.sidebar .widget-categories ul,
.sidebar .widget_categories ul {
    list-style: none !important;
    padding-left: 0 !important;
    margin-left: 0 !important;
}

.sidebar .widget-categories li::marker,
.sidebar .widget_categories li::marker {
    content: "";
}

.popular-posts-list li {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: var(--space-3);
    align-items: center;
    padding: var(--space-3) 0;
    border-top: 1px solid var(--gray-200);
    margin-bottom: 0;
}

.popular-posts-list li:first-child {
    border-top: 0;
}

.popular-post-thumbnail img {
    width: 56px;
    height: 56px;
    object-fit: cover;
    margin-bottom: 0;
    border-radius: var(--radius-md);
}

.popular-post-content a {
    display: block;
    font-size: var(--text-sm);
    color: var(--gray-900);
}

.popular-post-date {
    display: block;
    margin-top: var(--space-1);
    font-size: var(--text-xs);
    color: var(--gray-500);
}

/* ========================================
   Category Latest (Front Page)
   ======================================== */
.category-posts {
    margin-top: var(--space-10);
}

.category-latest-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .category-latest-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .category-latest-grid {
        grid-template-columns: 1fr;
    }
}

.category-latest-card {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 240px;
}

.category-latest-card-link {
    display: block;
    color: inherit;
    text-decoration: none;
    height: 100%;
}

.category-latest-card-link:hover {
    text-decoration: none;
}

.category-latest-image-wrap {
    background-color: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    padding: 0;
    height: 180px;
    display: block;
    overflow: hidden;
}

.category-latest-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    margin-bottom: 0; /* override global img margin */
    border-radius: 0;
    display: block;
}

.category-latest-body {
    padding: var(--space-5);
}

.category-latest-count {
    margin: 0 0 var(--space-2);
    font-size: var(--text-xs);
    color: var(--gray-600);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.category-latest-title {
    margin: 0;
    font-size: var(--text-lg);
    line-height: var(--leading-tight);
    padding-left: 0;
    border-left: 0;
}

.category-latest-card-link:hover .category-latest-title {
    color: var(--primary-blue);
}

/* ========================================
   Home Two Column (Front Page)
   ======================================== */
.home-two-column {
    margin-top: var(--space-10);
}

.home-two-column-grid {
    display: grid;
    grid-template-columns: 7fr 3fr;
    gap: var(--space-8);
    align-items: start;
}

@media (max-width: 1024px) {
    .home-two-column-grid {
        grid-template-columns: 1fr;
    }
}

/* Latest list tweaks for front page */
.home-latest .article-list-item {
    border-top: 1px solid var(--gray-200);
    padding: var(--space-5) 0;
}

.home-latest .article-thumbnail a {
    display: block;
    width: 128px;
    height: 86px;
}

.article-thumb-placeholder {
    display: block;
    width: 128px;
    height: 86px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--gray-200), var(--gray-100));
}

.home-latest .article-thumbnail img {
    width: 128px;
    height: 86px;
}

.home-latest .article-title {
    font-size: var(--text-lg);
    line-height: var(--leading-tight);
}

.home-latest .article-footer {
    font-size: var(--text-sm);
}

/* Profile card */
.profile-card {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.profile-card--sidebar {
    border: 0;
    box-shadow: none;
    border-radius: var(--radius-lg);
}

.profile-card--sidebar .profile-card-body {
    padding: var(--space-5);
}

.profile-card--sidebar .profile-card-name {
    font-size: var(--text-lg);
}

.profile-card--sidebar .profile-card-bio {
    font-size: var(--text-sm);
}

.profile-card-image img {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 0;
    border-radius: 0;
}

.profile-card-body {
    padding: var(--space-6);
}

.profile-card-label {
    margin: 0 0 var(--space-2);
    font-size: var(--text-xs);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gray-600);
}

.profile-card-name {
    margin: 0 0 var(--space-3);
    padding-left: 0;
    border-left: 0;
    font-size: var(--text-xl);
}

.profile-card-bio {
    margin: 0 0 var(--space-4);
    color: var(--gray-600);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.profile-card-link {
    font-weight: 600;
    text-decoration: none;
}

.profile-card-link:hover {
    text-decoration: underline;
}

/* ========================================
   Header
   ======================================== */
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) 0;
}

.site-logo a {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
}

.site-logo a:hover {
    text-decoration: none;
}

.header-search {
    max-width: 360px;
    width: 100%;
}

.header-search--nav {
    display: none; /* mobile only */
}

.header-search--desktop {
    display: block; /* desktop only */
}

@media (min-width: 769px) {
    /* Desktop: align nav + search to the right as a group */
    .header-inner {
        justify-content: flex-start;
        gap: var(--space-6);
    }

    .main-navigation {
        margin-left: auto;
        transform: none;
    }

    .header-search--desktop {
        max-width: 260px;              /* smaller on desktop */
        margin-right: 0;               /* keep it to the right */
    }

    .header-search--desktop .search-field {
        padding: 0.5rem 0.65rem;
        font-size: var(--text-sm);
    }

    .header-search--desktop .search-submit {
        width: 36px;
        height: 36px;
    }

    .header-search--desktop .search-submit svg {
        width: 18px;
        height: 18px;
    }
}

.search-form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-2);
    align-items: center;
}

.search-label {
    margin: 0;
}

.search-field {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-300);
    background-color: white;
    color: var(--gray-900);
    font-size: var(--text-sm);
}

.search-field:focus {
    outline: none;
    border-color: var(--primary-blue-light);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.18);
}

.search-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-300);
    background-color: white;
    color: var(--gray-700);
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.search-submit:hover {
    border-color: var(--primary-blue-light);
    color: var(--primary-blue-dark);
    background-color: var(--gray-50);
}

.main-navigation > ul {
    display: flex;
    list-style: none;
    gap: var(--space-6);
    padding: 0;
    margin: 0;
}

/* Ensure no bullets/padding in nav (also affects sub-menus) */
.main-navigation ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-navigation a {
    color: var(--gray-700);
    font-weight: 500;
    transition: color 0.2s ease;
}

.main-navigation a:hover {
    color: var(--primary-blue);
    text-decoration: none;
}

/* Dropdown (Submenu) */
@media (min-width: 769px) {
    .main-navigation li {
        position: relative;
    }

    /* Hide submenu by default */
    .main-navigation ul ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 220px;
        background-color: white;
        border: 1px solid var(--gray-200);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        padding: var(--space-2) 0;
        margin-top: 8px;
        z-index: var(--z-dropdown);
    }

    /* Bridge the hover gap so submenu stays clickable */
    .main-navigation ul ul::before {
        content: "";
        position: absolute;
        top: -8px;
        left: 0;
        right: 0;
        height: 8px;
    }

    .main-navigation ul ul li {
        width: 100%;
    }

    .main-navigation ul ul a {
        display: block;
        padding: var(--space-2) var(--space-4);
        white-space: nowrap;
    }

    /* Show on hover / keyboard focus */
    .main-navigation li:hover > ul,
    .main-navigation li:focus-within > ul {
        display: block;
    }
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--text-2xl);
    cursor: pointer;
    color: var(--gray-700);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .main-navigation {
        display: none;
    }

    .main-navigation.active {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        box-shadow: var(--shadow-lg);
    }

    .main-navigation > ul {
        flex-direction: column;
        padding: var(--space-4);
    }

    /* Search inside opened nav (mobile) */
    .main-navigation .header-search--nav {
        display: block;
        padding: var(--space-4);
        border-bottom: 1px solid var(--gray-200);
    }

    .header-search {
        max-width: none;
    }

    .header-search--desktop {
        display: none;
    }

    /* Smaller site title on narrow screens */
    .site-logo a {
        font-size: 1.125rem; /* ~18px */
    }

    /* Mobile: show submenu as nested list */
    .main-navigation ul ul {
        display: block;
        position: static;
        min-width: auto;
        border: 0;
        box-shadow: none;
        padding: 0 0 0 var(--space-4);
        margin-top: var(--space-2);
        gap: 0;
    }

    .main-navigation ul ul a {
        padding: var(--space-2) 0;
        display: block;
    }
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-16) 0 var(--space-8);
    margin-top: var(--space-16);
}

/* Footer typography / links */
.site-footer h1,
.site-footer h2,
.site-footer h3,
.site-footer h4,
.site-footer h5,
.site-footer h6 {
    color: white;
}

.site-footer a {
    color: var(--gray-100);
    text-decoration: none;
}

.site-footer a:hover {
    color: white;
    text-decoration: underline;
}

/* Remove bullets/indent only in footer */
.site-footer ul,
.site-footer ol {
    list-style: none;
    padding-left: 0;
    margin: 0; /* override global ul/ol margin-bottom */
}

.site-footer li {
    margin-bottom: var(--space-2);
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    flex-wrap: wrap;
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid var(--gray-700);
    font-size: var(--text-sm);
    color: var(--gray-400);
    flex-direction: column; /* nav on top, copyright below */
}

.footer-navigation {
    width: 100%;
}

.footer-navigation ul {
    display: flex;
    gap: var(--space-6);
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    padding: 0;
    margin: 0;
}

.footer-navigation a {
    color: var(--gray-200);
}

.footer-navigation a:hover {
    color: white;
}

.site-info p {
    margin-bottom: 0;
}

.site-info {
    width: 100%;
    text-align: center;
}

@media (max-width: 640px) {
    .footer-navigation ul {
        gap: var(--space-4);
    }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-block;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 3px;
}

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

.btn-primary:hover {
    background-color: var(--primary-blue-dark);
    color: white; /* override global a:hover color */
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:focus-visible {
    color: white;
    text-decoration: none;
}

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-900);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
    color: var(--gray-900); /* override global a:hover color */
    text-decoration: none;
}

/* ========================================
   Contact Form 7 (wpcf7)
   ======================================== */
.wpcf7 {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    padding: clamp(20px, 3vw, 32px);
}

.wpcf7 form {
    margin: 0;
}

.wpcf7 form p {
    margin-bottom: var(--space-5);
}

.wpcf7 form p:last-of-type {
    margin-bottom: 0;
}

.wpcf7 label,
.wpcf7 form p {
    font-weight: 700;
    color: var(--gray-800);
}

.wpcf7 .wpcf7-form-control-wrap {
    display: block;
    margin-top: var(--space-2);
}

.wpcf7 .wpcf7-form-control {
    width: 100%;
    max-width: 100%;
}

.wpcf7 input[type="text"],
.wpcf7 input[type="email"],
.wpcf7 input[type="url"],
.wpcf7 input[type="tel"],
.wpcf7 select,
.wpcf7 textarea {
    appearance: none;
    width: 100%;
    padding: 0.85rem 0.95rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-300);
    background-color: white;
    color: var(--gray-900);
    font-size: var(--text-base);
    line-height: 1.4;
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.wpcf7 textarea {
    min-height: 180px;
    resize: vertical;
}

.wpcf7 input::placeholder,
.wpcf7 textarea::placeholder {
    color: var(--gray-400);
}

.wpcf7 input:focus,
.wpcf7 textarea:focus,
.wpcf7 select:focus {
    outline: none;
    border-color: var(--primary-blue-light);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.18);
}

.wpcf7 .privacy-note {
    font-weight: 500;
    color: var(--gray-600);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.wpcf7 .privacy-note a {
    font-weight: 700;
}

.wpcf7 .wpcf7-acceptance {
    margin-top: var(--space-2);
    font-weight: 600;
    color: var(--gray-700);
}

.wpcf7 .wpcf7-acceptance .wpcf7-list-item {
    margin: 0;
}

.wpcf7 .wpcf7-acceptance input[type="checkbox"] {
    width: 18px;
    height: 18px;
    vertical-align: -3px;
    margin-right: var(--space-2);
}

.wpcf7 input.wpcf7-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    width: 100%;
    padding: 0.95rem 1.25rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--primary-blue);
    background-color: var(--primary-blue);
    color: white;
    font-weight: 800;
    font-size: var(--text-base);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.wpcf7 input.wpcf7-submit:hover {
    background-color: var(--primary-blue-dark);
    border-color: var(--primary-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.wpcf7 input.wpcf7-submit:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.wpcf7 input.wpcf7-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.wpcf7 .wpcf7-spinner {
    margin: 12px auto 0;
    display: block;
}

/* Validation + response */
.wpcf7 .wpcf7-not-valid-tip {
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--error);
}

.wpcf7 .wpcf7-response-output {
    margin: var(--space-6) 0 0;
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    background-color: var(--gray-50);
    font-size: var(--text-sm);
    color: var(--gray-800);
}

.wpcf7 form.invalid .wpcf7-response-output {
    border-color: rgba(239, 68, 68, 0.35);
    background-color: rgba(254, 226, 226, 0.6);
}

.wpcf7 form.sent .wpcf7-response-output {
    border-color: rgba(16, 185, 129, 0.35);
    background-color: rgba(209, 250, 229, 0.7);
}

.wpcf7 form.failed .wpcf7-response-output,
.wpcf7 form.aborted .wpcf7-response-output {
    border-color: rgba(245, 158, 11, 0.35);
    background-color: rgba(254, 243, 199, 0.8);
}

/* ========================================
   Cards
   ======================================== */
.card {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

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

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

.card-excerpt {
    color: var(--gray-600);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

/* ========================================
   Archive / Post Grid / Post Card
   ======================================== */
.archive-page .archive-header {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
}

.archive-page .archive-title {
    margin: 0 0 var(--space-3);
    font-size: var(--text-3xl);
    line-height: var(--leading-tight);
}

.archive-page .archive-label {
    display: inline-block;
    margin-right: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--gray-600);
    letter-spacing: 0.04em;
}

.archive-page .archive-description {
    color: var(--gray-700);
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
}

.archive-page .archive-description p:last-child {
    margin-bottom: 0;
}

.archive-page .archive-count {
    margin: 0;
    color: var(--gray-600);
    font-size: var(--text-sm);
}

.post-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .post-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .post-grid {
        grid-template-columns: 1fr;
        gap: var(--space-5);
    }
}

.post-card {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--gray-300);
}

.post-card .card-thumbnail {
    position: relative;
    overflow: hidden;
    background-color: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
    aspect-ratio: 16 / 9;
}

.post-card .card-thumbnail a {
    display: block;
    width: 100%;
    height: 100%;
}

.post-card .card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    margin-bottom: 0; /* override global img margin */
    border-radius: 0;
}

.post-card .card-thumb-placeholder {
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--gray-200), var(--gray-100));
}

.post-card .card-badge {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.6rem;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 800;
    letter-spacing: 0.04em;
    color: white;
    box-shadow: var(--shadow-sm);
    background-color: var(--gray-700);
}

/* Type colors (support multiple keys) */
.post-card .badge-howto {
    background-color: var(--primary-blue);
}
.post-card .badge-trouble,
.post-card .badge-troubleshoot {
    background-color: var(--warning);
}
.post-card .badge-case,
.post-card .badge-case-study {
    background-color: var(--secondary-purple);
}
.post-card .badge-tech,
.post-card .badge-technical {
    background-color: var(--secondary-green);
}
.post-card .badge-roadmap {
    background-color: var(--primary-blue-dark);
}
.post-card .badge-summary {
    background-color: var(--gray-700);
}

.post-card .card-body {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    flex: 1 1 auto;
}

.post-card .card-meta {
    margin-top: 0;
    font-size: var(--text-xs);
}

.post-card .card-category {
    display: inline-flex;
    align-items: center;
    max-width: 70%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--primary-blue-dark);
    font-weight: 700;
}

.post-card .card-category:hover {
    color: var(--primary-blue);
    text-decoration: none;
}

.post-card .card-date {
    color: var(--gray-500);
}

/* h3 の共通装飾（左ボーダー等）をカード内では無効化 */
.post-card .card-title {
    margin: 0;
    padding-left: 0;
    border-left: 0;
    font-size: var(--text-lg);
    line-height: var(--leading-tight);
}

.post-card .card-title a {
    color: var(--gray-900);
    text-decoration: none;
}

.post-card .card-title a:hover {
    color: var(--primary-blue);
    text-decoration: none;
}

.post-card .card-excerpt {
    color: var(--gray-600);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.post-card .card-excerpt p:last-child {
    margin-bottom: 0;
}

.post-card .card-footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-3);
    padding-top: var(--space-4);
    border-top: 1px solid var(--gray-200);
}

.post-card .card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    min-width: 0;
}

.post-card .card-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-full);
    background-color: var(--gray-100);
    color: var(--gray-700);
    font-size: var(--text-xs);
    font-weight: 700;
    text-decoration: none;
    border: 1px solid var(--gray-200);
}

.post-card .card-tag:hover {
    border-color: var(--primary-blue-light);
    color: var(--primary-blue-dark);
    text-decoration: none;
}

.post-card .card-read-more {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 800;
    color: var(--primary-blue-dark);
    white-space: nowrap;
    text-decoration: none;
    align-self: flex-end;
}

.post-card .card-read-more:hover {
    color: var(--primary-blue);
    text-decoration: none;
}

.no-posts {
    padding: var(--space-10);
    border: 1px dashed var(--gray-300);
    border-radius: var(--radius-xl);
    background-color: var(--gray-50);
    text-align: center;
}

.no-posts p {
    margin-bottom: var(--space-6);
    color: var(--gray-700);
}

/* ========================================
   Recovery (404 / empty states)
   ======================================== */
.recovery {
    margin-top: var(--space-8);
    padding: var(--space-8);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    background-color: white;
    box-shadow: var(--shadow-sm);
}

.recovery-title {
    margin-top: 0;
    margin-bottom: var(--space-3);
    border-bottom: 0;
    padding-bottom: 0;
    font-size: var(--text-xl);
    color: var(--primary-blue-dark);
}

.recovery-message {
    margin: 0 0 var(--space-6);
    color: var(--gray-700);
    font-size: var(--text-sm);
}

.recovery-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.recovery-search {
    margin-bottom: var(--space-8);
    padding: var(--space-5);
    border-radius: var(--radius-xl);
    background-color: var(--gray-50);
    border: 1px solid var(--gray-200);
}

.recovery-search-title {
    margin: 0 0 var(--space-3);
    font-weight: 800;
    color: var(--gray-800);
}

.recovery-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 1024px) {
    .recovery-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.recovery-panel {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    background-color: white;
}

.recovery-panel-title {
    margin-top: 0;
    margin-bottom: var(--space-4);
    border-bottom: 0;
    padding-bottom: 0;
    font-size: var(--text-base);
    color: var(--gray-900);
}

.recovery-popular-list,
.recovery-category-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.recovery-popular-link {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: var(--space-3);
    align-items: center;
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    background-color: var(--gray-50);
    color: inherit;
    text-decoration: none;
}

.recovery-popular-link:hover {
    border-color: var(--primary-blue-light);
    background-color: white;
    text-decoration: none;
}

.recovery-popular-thumb img {
    width: 56px;
    height: 56px;
    object-fit: cover;
    margin-bottom: 0;
    border-radius: var(--radius-md);
}

.recovery-popular-thumb-placeholder {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--gray-200), var(--gray-100));
}

.recovery-popular-title {
    display: block;
    font-weight: 800;
    color: var(--gray-900);
    font-size: var(--text-sm);
    line-height: 1.35;
}

.recovery-popular-date {
    display: block;
    margin-top: var(--space-1);
    font-size: var(--text-xs);
    color: var(--gray-500);
}

.recovery-category-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    background-color: var(--gray-50);
    color: inherit;
    text-decoration: none;
}

.recovery-category-link:hover {
    border-color: var(--primary-blue-light);
    background-color: white;
    text-decoration: none;
}

.recovery-category-name {
    font-weight: 800;
    color: var(--gray-900);
    font-size: var(--text-sm);
}

.recovery-category-count {
    font-size: var(--text-xs);
    color: var(--gray-500);
    font-weight: 800;
}

.recovery-muted {
    color: var(--gray-600);
    font-size: var(--text-sm);
}

/* 404 header */
.error-404 .error-header {
    padding: var(--space-10) 0 var(--space-4);
}

.error-404 .error-code {
    font-size: 4rem;
    line-height: 1;
    font-weight: 900;
    color: var(--gray-200);
    margin: 0 0 var(--space-3);
}

.error-404 .error-title {
    margin: 0 0 var(--space-3);
    font-size: var(--text-2xl);
}

.error-404 .error-description {
    margin: 0;
    color: var(--gray-700);
    font-size: var(--text-sm);
}

@media (max-width: 640px) {
    .recovery {
        padding: var(--space-6);
    }
}

/* ========================================
   Pagination (the_posts_pagination)
   ======================================== */
.navigation.pagination {
    margin-top: var(--space-10);
}

.navigation.pagination .nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    align-items: center;
    justify-content: center;
}

.navigation.pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--space-3);
    border-radius: var(--radius-full);
    border: 1px solid var(--gray-200);
    background-color: white;
    color: var(--gray-800);
    font-weight: 700;
    text-decoration: none;
}

.navigation.pagination .page-numbers:hover {
    border-color: var(--primary-blue-light);
    color: var(--primary-blue-dark);
    text-decoration: none;
}

.navigation.pagination .page-numbers.current {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
    color: white;
}

.navigation.pagination .page-numbers.dots {
    border-color: transparent;
    background: transparent;
    min-width: auto;
    padding: 0 var(--space-2);
}

/* ========================================
   Roadmap Page
   ======================================== */
.roadmap-page .roadmap-header {
    margin-bottom: var(--space-10);
    padding-bottom: var(--space-8);
    border-bottom: 1px solid var(--gray-200);
}

.roadmap-page .roadmap-hero {
    background: linear-gradient(135deg, #eef2ff 0%, #ecfeff 45%, #ffffff 100%);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-6);
    overflow: hidden;
}

.roadmap-page .roadmap-hero-inner {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-8);
    align-items: center;
}

.roadmap-page .roadmap-hero-text {
    min-width: 0;
}

.roadmap-page .roadmap-hero-media {
    display: flex;
    justify-content: flex-end;
}

.roadmap-page .roadmap-hero-image {
    width: min(420px, 100%);
    height: auto;
    display: block;
    margin-bottom: 0; /* override global img margin */
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.roadmap-page .roadmap-title {
    margin: 0 0 var(--space-4);
}

.roadmap-page .roadmap-lead {
    margin: 0 0 var(--space-6);
    color: var(--gray-700);
    font-size: var(--text-sm);
}

.roadmap-page .roadmap-steps {
    background-color: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
}

.roadmap-page .roadmap-steps-list {
    margin: 0;
    padding-left: var(--space-8);
}

.roadmap-page .roadmap-steps-list li {
    margin-bottom: var(--space-3);
}

.roadmap-page .roadmap-steps-list li:last-child {
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .roadmap-page .roadmap-hero {
        padding: var(--space-6);
    }

    .roadmap-page .roadmap-hero-inner {
        grid-template-columns: 1fr;
    }

    .roadmap-page .roadmap-hero-media {
        justify-content: center;
    }
}

/* ========================================
   Thanks Page
   ======================================== */
.thanks-page .thanks-card {
    margin: var(--space-10) auto 0;
    max-width: 720px;
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    padding: clamp(24px, 3vw, 40px);
    text-align: center;
}

.thanks-page .thanks-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem 0.7rem;
    border-radius: var(--radius-full);
    background-color: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.25);
    color: #065f46;
    font-weight: 900;
    font-size: var(--text-xs);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin: 0 0 var(--space-4);
}

.thanks-page .thanks-title {
    margin: 0 0 var(--space-3);
    font-size: var(--text-2xl);
}

.thanks-page .thanks-message {
    margin: 0 0 var(--space-6);
    color: var(--gray-700);
}

.thanks-page .thanks-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
    margin-bottom: var(--space-6);
}

.thanks-page .thanks-note {
    margin: 0;
    color: var(--gray-500);
    font-size: var(--text-sm);
}

/* ========================================
   Badges
   ======================================== */
.badge {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary {
    background-color: var(--primary-blue-light);
    color: white;
}

.badge-success {
    background-color: var(--success);
    color: white;
}

.badge-warning {
    background-color: var(--warning);
    color: white;
}

.badge-error {
    background-color: var(--error);
    color: white;
}

/* ========================================
   Topic Clusters (Home)
   ======================================== */
.topic-clusters {
    margin-top: var(--space-12);
}

.cluster-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-6);
}

@media (max-width: 1024px) {
    .cluster-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .cluster-grid {
        grid-template-columns: 1fr;
    }
}

.cluster-card {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.cluster-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* h3 の共通装飾（左ボーダー等）をクラスタカード内では無効化 */
.cluster-title {
    margin-top: 0;
    margin-bottom: var(--space-3);
    padding-left: 0;
    border-left: 0;
    font-size: var(--text-xl);
}

.cluster-description {
    margin-bottom: var(--space-4);
    color: var(--gray-600);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.cluster-meta {
    margin-top: auto;
    font-size: var(--text-sm);
    color: var(--gray-600);
    margin-bottom: var(--space-4);
}

.cluster-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 600;
    text-decoration: none;
}

.cluster-link:hover {
    text-decoration: underline;
}

/* ========================================
   Info Boxes
   ======================================== */
.info-box {
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
    border-left: 4px solid;
}

.info-box-success {
    background-color: #d1fae5;
    border-color: var(--success);
    color: #065f46;
}

.info-box-warning {
    background-color: #fef3c7;
    border-color: var(--warning);
    color: #92400e;
}

.info-box-error {
    background-color: #fee2e2;
    border-color: var(--error);
    color: #991b1b;
}

.info-box-info {
    background-color: #dbeafe;
    border-color: var(--info);
    color: #1e40af;
}

/* ========================================
   Breadcrumbs
   ======================================== */
.breadcrumbs {
    font-size: var(--text-sm);
    color: var(--gray-600);
    margin-bottom: var(--space-6);
    padding: var(--space-3) 0;
}

.breadcrumbs a {
    color: var(--gray-600);
}

.breadcrumbs a:hover {
    color: var(--primary-blue);
}

.breadcrumbs span {
    margin: 0 var(--space-2);
}

/* ========================================
   Article Meta
   ======================================== */
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    align-items: center;
    font-size: var(--text-sm);
    color: var(--gray-600);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--gray-200);
}

.article-meta > * {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ========================================
   Article Types (single.php)
   ======================================== */

/* Howto: conclusion + steps */
.conclusion-summary {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-left: 4px solid var(--primary-blue);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    margin: var(--space-8) 0;
}

.conclusion-summary h2 {
    margin-top: 0;
    margin-bottom: var(--space-3);
    font-size: var(--text-lg);
    border-bottom: 0;
    padding-bottom: 0;
}

.howto-steps {
    margin: var(--space-10) 0;
}

.howto-steps > h2 {
    margin-top: 0;
    border-bottom: 0;
    padding-bottom: 0;
    font-size: var(--text-2xl);
}

.howto-steps-list {
    list-style: none;
    padding-left: 0;
    margin: var(--space-6) 0 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.howto-step {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: var(--space-4);
    align-items: start;
    padding: var(--space-5);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    background-color: white;
    box-shadow: var(--shadow-sm);
}

.howto-step-badge {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background-color: var(--primary-blue);
    color: white;
    display: grid;
    place-items: center;
    font-weight: 800;
}

.howto-step-title {
    margin: 0 0 var(--space-2);
    padding-left: 0;
    border-left: 0;
    font-size: var(--text-lg);
}

.howto-step-body p:last-child {
    margin-bottom: 0;
}

.howto-tips-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin: var(--space-8) 0;
}

@media (max-width: 768px) {
    .howto-tips-grid {
        grid-template-columns: 1fr;
    }
}

/* Troubleshoot: checklist + accordion */
.checklist {
    list-style: none;
    padding-left: 0;
    margin: var(--space-4) 0 var(--space-8);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.checklist li {
    position: relative;
    padding-left: 34px;
}

.checklist li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.35em;
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 2px solid var(--gray-400);
    background-color: white;
}

.checklist li::after {
    content: "";
    position: absolute;
    left: 5px;
    top: 0.58em;
    width: 8px;
    height: 4px;
    border-left: 2px solid var(--primary-blue);
    border-bottom: 2px solid var(--primary-blue);
    transform: rotate(-45deg);
    opacity: 0.6;
}

.accordion {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.accordion-item {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background-color: white;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.accordion-summary {
    cursor: pointer;
    padding: var(--space-4) var(--space-5);
    font-weight: 700;
    list-style: none;
}

.accordion-summary::-webkit-details-marker {
    display: none;
}

.accordion-summary::after {
    content: "▾";
    float: right;
    color: var(--gray-500);
}

details[open] > .accordion-summary::after {
    content: "▴";
}

.accordion-panel {
    padding: 0 var(--space-5) var(--space-5);
    color: var(--gray-700);
}

.accordion-panel p:last-child {
    margin-bottom: 0;
}

/* Case study: context + timeline + before/after */
.case-context {
    margin: var(--space-10) 0;
}

.case-context-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
    margin: var(--space-4) 0 0;
}

@media (max-width: 1024px) {
    .case-context-grid {
        grid-template-columns: 1fr;
    }
}

.case-context-item {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    background-color: white;
    box-shadow: var(--shadow-sm);
}

.case-context-item dt {
    font-size: var(--text-xs);
    color: var(--gray-500);
    margin-bottom: var(--space-2);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.case-context-item dd {
    margin: 0;
    color: var(--gray-900);
}

.timeline {
    list-style: none;
    padding-left: 0;
    margin: var(--space-6) 0 0;
    border-left: 2px solid var(--gray-200);
}

.timeline-item {
    position: relative;
    padding: 0 0 var(--space-6) var(--space-6);
}

.timeline-marker {
    position: absolute;
    left: -7px;
    top: 2px;
    width: 12px;
    height: 12px;
    border-radius: 999px;
    background-color: var(--primary-blue);
}

.timeline-heading {
    display: flex;
    gap: var(--space-3);
    align-items: baseline;
    margin-bottom: var(--space-2);
}

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

.timeline-body p:last-child {
    margin-bottom: 0;
}

.before-after-table table {
    display: table; /* override global table { display:block } for better comparison */
    width: 100%;
}

/* Technical: tech badges + resource buttons */
.tech-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.tech-stack-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
    margin-top: var(--space-3);
    margin-bottom: var(--space-5); /* 「使用技術」の下に余白 */
}

.tech-stack-label {
    font-weight: 700;
    color: var(--gray-700);
    font-size: var(--text-sm);
}

.tech-stack-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tech-badge-icon {
    font-size: 0.95em;
}

.difficulty-level {
    margin-top: var(--space-3);
    margin-bottom: var(--space-5); /* 難易度の下に余白 */
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.code-resources {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin: var(--space-6) 0;
}

/* Roadmap: overview box uses info-box styles */
.roadmap-overview h2 {
    margin-top: 0;
}

.roadmap-nav {
    margin: var(--space-6) 0 var(--space-10);
}

.roadmap-nav-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.roadmap-nav-item a,
.roadmap-nav-item span {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    border: 1px solid var(--gray-200);
    background-color: white;
    color: var(--gray-800);
    font-weight: 600;
    text-decoration: none;
}

.roadmap-nav-item a:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue-dark);
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-5);
    margin-top: var(--space-5);
}

@media (max-width: 1024px) {
    .resource-grid {
        grid-template-columns: 1fr;
    }
}

.resource-card {
    display: block;
    padding: var(--space-5);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    background-color: white;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: var(--gray-900);
}

.resource-card:hover {
    border-color: var(--primary-blue);
    text-decoration: none;
}

.resource-card-title {
    font-weight: 800;
    margin-bottom: var(--space-2);
}

.resource-card-desc {
    font-size: var(--text-sm);
    color: var(--gray-600);
}

/* Related posts (make it clearer than generic cards) */
.related-posts {
    margin-top: var(--space-10);
    padding: var(--space-6);
    background-color: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
}

.related-posts-title {
    margin-top: 0;
    margin-bottom: var(--space-4);
    border-bottom: 0;
    padding-bottom: 0;
    font-size: var(--text-xl);
    color: var(--primary-blue-dark);
}

.related-posts-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.related-posts .card {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: var(--space-4);
    align-items: start;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: none;
}

.related-posts .card:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--primary-blue-light);
}

.related-posts .card-image {
    width: 120px;
    height: 84px;
    object-fit: cover;
    border-radius: var(--radius-xl) 0 0 var(--radius-xl);
    margin-bottom: 0;
}

.related-posts .card-content {
    padding: var(--space-4);
}

.related-posts .card-title {
    margin-top: 0;
    margin-bottom: var(--space-2);
    font-size: var(--text-base);
}

.related-posts .card-excerpt {
    margin-bottom: 0;
}

@media (max-width: 640px) {
    .related-posts .card {
        grid-template-columns: 1fr;
    }
    .related-posts .card-image {
        width: 100%;
        border-radius: 0;
    }
}

/* Roadmap: make related posts roomier */
.article-roadmap .related-posts {
    padding: var(--space-8);
}

.article-roadmap .related-posts-grid {
    gap: var(--space-6);
}

.article-roadmap .related-posts .card {
    grid-template-columns: 180px 1fr;
    gap: var(--space-5);
    align-items: stretch; /* let thumbnail stretch to content height */
}

.article-roadmap .related-posts .card > a:first-child {
    display: flex; /* make image fill available height */
    height: 100%;
}

.article-roadmap .related-posts .card-image {
    width: 100%;
    height: 100%;
    min-height: 120px;
    object-fit: cover;
    border-radius: var(--radius-xl) 0 0 var(--radius-xl);
    flex: 1 1 auto;
}

.article-roadmap .related-posts .card-content {
    padding: var(--space-5);
}

.article-roadmap .related-posts .card-content .badge {
    display: inline-block;
    margin-bottom: var(--space-3); /* カテゴリの下に余白 */
}

.article-roadmap .related-posts .card-title {
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
}

.article-roadmap .related-posts .card-excerpt {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

@media (max-width: 640px) {
    .article-roadmap .related-posts .card {
        grid-template-columns: 1fr;
    }
    .article-roadmap .related-posts .card > a:first-child {
        height: auto;
    }
    .article-roadmap .related-posts .card-image {
        height: 180px;
        border-radius: 0;
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    :root {
        --text-4xl: 1.875rem; /* 30px */
        --text-3xl: 1.5rem; /* 24px */
        --text-2xl: 1.25rem; /* 20px */
    }

    .site-container {
        padding: 0 var(--space-3);
    }

    .content-area {
        padding: var(--space-4);
    }

    h2 {
        margin-top: var(--space-8);
    }

    h3 {
        margin-top: var(--space-6);
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
    text-align: center;
}

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

.mt-0 {
    margin-top: 0;
}
.mt-4 {
    margin-top: var(--space-4);
}
.mt-8 {
    margin-top: var(--space-8);
}
.mb-0 {
    margin-bottom: 0;
}
.mb-4 {
    margin-bottom: var(--space-4);
}
.mb-8 {
    margin-bottom: var(--space-8);
}

.hidden {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* 画像アイコンのスタイル */
.cluster-icon-img {
    width: 128px;
    height: 128px;
    object-fit: contain;
    margin-bottom: 0; /* グローバル img の余白を打ち消す */
}

/* SVG icons for topic clusters */
.cluster-icon-svg {
    width: 40px;
    height: 40px;
    color: var(--gray-600);
}

/* 既存の .cluster-icon のスタイルを調整 */
.cluster-icon {
    font-size: 48px; /* 絵文字の場合 */
    margin-bottom: 16px;
    display: flex;
    justify-content: space-around;
    align-items: center;
}