:root {
    /* Light Mode (Default) */
    --text-color: #333;
    --bg-color: #fcfcfc;
    --header-bg: #fff;
    --header-text: #333;
    --accent-color: #0056b3;
    --border-color: #eaeaea;
    --card-bg: #fff;
    --font-main: 'Noto Sans JP', sans-serif;
    --input-bg: #fff;
    --input-border: #ddd;
    --header-offset: 100px;
    --footer-bg: #f7f9fc;
    --footer-text: #233042;
    --footer-subtext: #5e6b7d;
    --footer-border: #dbe2ec;
    --footer-chip-bg: #ffffff;
}

[data-theme="dark"] {
    /* Dark Mode */
    --text-color: #e0e0e0;
    --bg-color: #121212;
    --header-bg: #1e1e1e;
    --header-text: #e0e0e0;
    --accent-color: #4dabf7;
    --border-color: #333;
    --card-bg: #1e1e1e;
    --input-bg: #2d2d2d;
    --input-border: #444;
    --footer-bg: #171b20;
    --footer-text: #e7edf5;
    --footer-subtext: #9ca8b8;
    --footer-border: #2a323d;
    --footer-chip-bg: #1f2630;
}

body {
    font-family: var(--font-main);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.8;
    margin: 0;
    padding: calc(var(--header-offset) + 16px) 0 0 0;
    transition: background-color 0.3s, color 0.3s;
}

#reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--accent-color);
    z-index: 10000; /* Above header and overlays */
    transition: width 0.1s ease-out;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

a { color: var(--text-color); text-decoration: none; transition: 0.3s; }
a:hover { color: var(--accent-color); }

/* Header */
.site-header {
    background-color: var(--header-bg);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000; /* Higher z-index for fixed header */
    transition: background-color 0.3s;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    will-change: transform;
    backface-visibility: hidden;
}
.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo a { 
    font-size: 1.5rem; 
    font-weight: 700; 
    letter-spacing: 0.05em;
    color: var(--header-text);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}
.header-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--header-text);
    padding: 5px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
}
.header-btn:hover { opacity: 0.7; }

/* Admin Nav in Header */
.admin-nav {
    display: flex;
    font-size: 0.85rem;
}

/* Overlay & Drawer Menu */
.overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1200;
    backdrop-filter: blur(2px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.overlay.active {
    opacity: 1;
    visibility: visible;
}
.menu-drawer {
    position: fixed;
    top: 0; right: 0;
    width: 280px; height: 100%;
    background: var(--card-bg);
    box-shadow: -2px 0 10px rgba(0,0,0,0.1);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1201;
    display: flex;
    flex-direction: column;
}
.overlay.active .menu-drawer {
    transform: translateX(0);
}
.drawer-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}
.drawer-header h3 { margin: 0; font-size: 1.2rem; }
.close-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text-color);
    cursor: pointer;
    line-height: 1;
}
.drawer-nav {
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 10px;
}
.drawer-nav a {
    padding: 12px 15px;
    border-radius: 8px;
    font-size: 1rem;
    border: 1px solid transparent;
}
.drawer-nav a:hover {
    background: rgba(0,0,0,0.05);
    color: var(--accent-color);
}
[data-theme="dark"] .drawer-nav a:hover {
    background: rgba(255,255,255,0.05);
}

.admin-drawer-link {
    background: var(--accent-color) !important;
    color: #fff !important;
    font-weight: 700;
}
.admin-drawer-link:hover {
    opacity: 0.9;
}
.logout-drawer-link {
    border: 1px solid var(--border-color) !important;
    color: var(--text-color);
    opacity: 0.8;
}
.drawer-divider {
    margin: 10px 0;
    border: 0;
    border-top: 1px solid var(--border-color);
    opacity: 0.5;
}

/* Site Navigation (Old style removed) */
.site-nav { display: none; }

/* Search Overlay */
#search-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 1100;
    justify-content: center;
    align-items: flex-start;
    padding-top: 100px;
}
.search-box {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    display: flex;
    gap: 10px;
}
.search-input {
    flex: 1;
    padding: 10px;
    font-size: 1.1rem;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-color);
}

/* Posts */
.post-preview { margin-bottom: 50px; }
.post-title { font-size: 1.8rem; margin-bottom: 10px; font-weight: 700; }
.post-meta { font-size: 0.85rem; color: #888; margin-bottom: 15px; display: block; }
.post-snippet { font-size: 1rem; color: inherit; opacity: 0.8; }
.read-more { display: inline-block; margin-top: 10px; font-size: 0.9rem; font-weight: 700; border-bottom: 1px solid var(--text-color); }

/* Static Pages */
.static-page .page-title {
    font-size: 1.8rem;
    margin-bottom: 20px;
}
.page-body ul {
    padding-left: 20px;
}
.simple-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.simple-list li {
    margin-bottom: 10px;
}
.muted {
    color: #888;
    font-size: 0.85rem;
    margin-left: 6px;
}
.contact-form {
    margin: 20px 0;
    padding: 20px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 8px;
}

/* Taxonomy select */
.taxonomy-section {
    margin-top: 50px;
    padding: 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}
.taxonomy-title {
    margin: 0 0 12px;
    font-size: 1.1rem;
}
.taxonomy-select select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-color);
    border-radius: 4px;
    font-size: 1rem;
}

/* Single Post */
.post-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    margin-bottom: 18px;
}
.post-pdf-button {
    letter-spacing: 0.02em;
}
#post-pdf-target {
    display: block;
}
.post-header {
    margin-bottom: 30px;
    text-align: center;
}
.post-header .post-title {
    font-size: 2.2rem;
    line-height: 1.25;
    margin: 0 0 10px;
    font-weight: 700;
}
.post-meta-inline {
    margin-bottom: 15px;
}
.post-meta-updated {
    color: #999;
    margin-left: 10px;
}
.post-taxonomy {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    font-size: 0.9rem;
}
.category-label {
    background: #eee;
    padding: 4px 10px;
    border-radius: 4px;
    color: #333;
    text-decoration: none;
}
.tags-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}
.tag-label {
    color: var(--accent-color);
    text-decoration: none;
}
.post-history-link {
    margin-top: 15px;
    font-size: 0.9rem;
}
.post-history-link a {
    color: #666;
    text-decoration: underline;
}
.ai-content-notice {
    margin: 15px auto 0;
    max-width: 520px;
    text-align: left;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 12px;
    background: rgba(0,0,0,0.02);
    break-inside: avoid;
    page-break-inside: avoid;
}
.ai-content-notice summary {
    cursor: pointer;
    font-weight: 700;
}
.ai-content-notice-body {
    margin-top: 8px;
    font-size: 0.9rem;
    color: #666;
}
.post-thumbnail {
    margin-bottom: 40px;
    text-align: center;
    break-inside: avoid;
    page-break-inside: avoid;
}
.post-thumbnail img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.post-content img { max-width: 100%; height: auto; border-radius: 4px; margin: 20px 0; }
.post-content h2 { margin-top: 40px; font-size: 1.5rem; border-left: 4px solid var(--accent-color); padding-left: 15px; }
.post-content p { margin-bottom: 1.5em; }
.post-content {
    overflow-wrap: anywhere;
    word-break: break-word;
}
.post-content pre,
.post-content table {
    max-width: 100%;
    overflow-x: auto;
}
.google-hashtags {
    margin-top: 40px;
    padding: 20px;
    background: rgba(0,0,0,0.02);
    border-radius: 8px;
    break-inside: avoid;
    page-break-inside: avoid;
}
.google-hashtags-label {
    margin-bottom: 10px;
    font-weight: bold;
    font-size: 0.8rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.google-hashtags-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.google-hashtags-list a {
    text-decoration: none;
    color: #4285F4;
    font-weight: bold;
}

/* Form & Inputs */
.form-group { margin-bottom: 20px; }
input[type="text"], input[type="password"], input[type="url"], textarea, select {
    width: 100%; padding: 12px; 
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    border-radius: 4px; font-size: 1rem;
    box-sizing: border-box;
}
.btn {
    display: inline-block; padding: 8px 16px; background: var(--text-color); color: var(--bg-color);
    border: 1px solid var(--text-color); border-radius: 6px; cursor: pointer; font-size: 0.9rem; text-decoration: none;
    transition: all 0.2s ease;
    font-weight: 500;
    line-height: 1.4;
}
.btn:hover { 
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.btn:active {
    transform: translateY(0);
}

/* Button Variations */
.btn-primary { 
    background: var(--accent-color); 
    border-color: var(--accent-color); 
    color: #fff; 
}
.btn-danger { 
    background: #d9534f; 
    border-color: #d9534f; 
    color: #fff; 
}
.btn-outline { 
    background: transparent; 
    border-color: var(--border-color); 
    color: var(--text-color); 
}
.btn-outline:hover {
    background: var(--border-color);
    color: var(--text-color);
}
.btn-info {
    background: #17a2b8;
    border-color: #17a2b8;
    color: #fff;
}
.btn-secondary {
    background: #6c757d;
    border-color: #6c757d;
    color: #fff;
}
.btn-sm {
    padding: 4px 10px;
    font-size: 0.8rem;
}

/* Toggle Switch Styles */
.custom-checkbox-container {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none;
    font-size: 0.9rem;
    font-weight: 500;
}
.custom-checkbox-container input {
    display: none !important;
}
.checkmark {
    width: 36px;
    height: 20px;
    background-color: #ccc;
    border-radius: 20px;
    display: inline-block;
    position: relative;
    transition: background-color 0.3s;
    flex-shrink: 0;
    border: none; /* Remove border for switch look */
}
.custom-checkbox-container input:checked ~ .checkmark {
    background-color: var(--accent-color);
}
.checkmark:after {
    content: "";
    position: absolute;
    display: block !important;
    left: 2px;
    top: 2px;
    width: 16px;
    height: 16px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    /* Reset checkmark icon properties */
    border: none;
    transform: none;
}
.custom-checkbox-container input:checked ~ .checkmark:after {
    transform: translateX(16px);
}

/* Profile & Diff (Dark Mode adjustments) */
.author-profile {
    margin-top: 50px;
    padding: 25px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 25px;
    break-inside: avoid;
    page-break-inside: avoid;
}
.author-info h3 { color: var(--text-color); }
.author-info p { color: inherit; opacity: 0.8; }

table.diff {
    table-layout: auto !important;
    width: 100% !important;
    color: #333; /* Diff content always light logic or needs adjustment */
}
/* Dark mode diff overrides */
[data-theme="dark"] table.diff {
    color: #ccc;
}
[data-theme="dark"] table.diff th {
    background-color: #333;
    color: #eee;
    border-bottom-color: #444;
}
[data-theme="dark"] table.diff td {
    border-color: #444;
}
[data-theme="dark"] .diff_add { background-color: #1e3a23; color: #e6ffec; }
[data-theme="dark"] .diff_chg { background-color: #4b4b00; color: #fffbdd; }
[data-theme="dark"] .diff_sub { background-color: #4b1e1e; color: #ffebe9; }

/* Editor area needs to be white always for Quill? Or dark? */
/* Quill supports dark mode but needs CSS. For simplicity, keep editor white in admin */
#editor-container { background: #fff; color: #000; }

.flash-messages .flash { background: var(--card-bg); border: 1px solid var(--border-color); }

/* Footer */
.site-footer {
    margin-top: 60px;
    padding: 22px 0 18px;
    border-top: 1px solid var(--footer-border);
    background: var(--footer-bg);
    color: var(--footer-text);
}
.footer-primary-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}
.footer-primary-links a {
    font-size: 0.92rem;
    text-decoration: none;
}
.footer-primary-links a:hover {
    text-decoration: underline;
    text-underline-offset: 2px;
}
.footer-details {
    margin-top: 12px;
    border-top: 1px solid var(--footer-border);
    padding-top: 10px;
}
.footer-details summary {
    cursor: pointer;
    color: var(--footer-subtext);
    font-size: 0.86rem;
    list-style: none;
}
.footer-details summary::-webkit-details-marker {
    display: none;
}
.footer-details summary::before {
    content: "+ ";
}
.footer-details[open] summary::before {
    content: "- ";
}
.footer-main {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-top: 10px;
}

@keyframes footerFadeIn {
    0% {
        opacity: 0;
        transform: translateY(-10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}
.footer-column {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
}
.footer-column h4 {
    margin: 0 0 6px;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}
.footer-column ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.footer-column li {
    margin-bottom: 4px;
}
.footer-nav-list li {
    margin: 0;
}
.footer-nav-list a {
    display: block;
    padding: 4px 0;
    border-radius: 0;
    border: 0;
    font-size: 0.88rem;
    line-height: 1.5;
}
.footer-nav-list a:hover {
    background: transparent;
    text-decoration: underline;
    text-underline-offset: 2px;
}
.footer-bottom {
    padding-top: 10px;
}
.copyright {
    margin: 0;
    font-size: 0.8rem;
    color: var(--footer-subtext);
}
.site-footer a {
    color: var(--footer-text);
}
.site-footer a:hover {
    color: var(--accent-color);
}
.footer-trust {
    border: 0;
}
.footer-trust-list li {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: baseline;
    line-height: 1.45;
}
.trust-label {
    color: var(--footer-subtext);
    font-size: 0.77rem;
    white-space: nowrap;
}
.trust-label::after {
    content: "：";
}
.trust-value {
    text-align: right;
    font-size: 0.86rem;
}
.footer-policy-links {
    margin-top: 6px;
    display: flex;
    flex-wrap: wrap;
    gap: 0;
}
.footer-policy-links a {
    font-size: 0.84rem;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
}
.footer-policy-links a + a::before {
    content: " / ";
    color: var(--footer-subtext);
}
.footer-column + .footer-column {
    padding-top: 10px;
    border-top: 1px solid var(--footer-border);
}

/* Body Adjustment */
html, body {
    overflow-x: hidden;
    max-width: 100%;
    width: 100%;
}

/* Twemoji */
img.emoji {
    height: 1.2em;
    width: 1.2em;
    margin: 0 .05em 0 .1em;
    vertical-align: -0.1em;
}

/* === Pagination Animation === */
.fade-in {
    animation: fadeIn 0.5s ease-in-out forwards;
    opacity: 0;
}

.fade-out {
    animation: fadeOut 0.3s ease-in-out forwards;
    opacity: 1;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-20px); }
}

.pagination-controls button {
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}
.pagination-controls button:hover {
    background-color: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

/* === Mobile Optimization (Unified) === */
@media (max-width: 600px) {
    body {
        padding-top: calc(var(--header-offset) + 12px);
    }
    .container {
        padding: 0 14px;
    }
    .admin-nav {
        display: none;
    }
    
    /* Header optimization */
    .site-header {
        padding: 8px 0;
    }
    .site-header .container {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 10px;
    }
    .logo {
        width: auto;
        flex-shrink: 1;
        min-width: 0;
    }
    .logo a {
        font-size: 1.2rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        display: block;
    }
    .header-actions {
        width: auto;
        justify-content: flex-end;
        gap: 12px;
        padding-top: 0;
        border-top: none;
        flex-shrink: 0;
    }
    .header-btn svg {
        width: 20px; height: 20px;
    }

    /* Footer adjustments */
    .footer-primary-links {
        gap: 10px 14px;
    }
    .footer-main {
        grid-template-columns: 1fr;
        gap: 10px;
        margin-top: 8px;
    }
    .footer-trust-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        margin-bottom: 6px;
    }
    .trust-value {
        text-align: left;
        font-size: 0.9rem;
    }
    .trust-label::after {
        content: "";
    }
    .footer-bottom {
        padding-top: 12px;
    }

    /* Profile adjustment */
    .author-profile {
        flex-direction: column;
        text-align: center;
        padding: 20px;
        gap: 15px;
    }
    .author-avatar {
        margin: 0 auto;
    }
    .author-links {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    /* Post content image adjustment */
.post-content img {
        max-width: 100%;
        height: auto;
    }
    
    /* Form input adjustment */
    input, textarea {
        font-size: 16px; /* Prevent iOS zoom */
    }
    
    /* Table scroll adjustment */
    .diff-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

@media print {
    .site-header,
    .site-footer,
    .no-pdf,
    #reading-progress-bar {
        display: none !important;
    }

    body {
        padding-top: 0 !important;
        background: #fff !important;
    }

    .container {
        max-width: none;
        padding: 0;
    }

    #post-pdf-target {
        margin: 0;
    }
}