/*
Theme Name: Readhub Theme
Theme URI: https://github.com/dongqingzimu/readhub-theme
Author: Antigravity
Author URI: https://gemini.google.com/
Description: A minimalist, clean, and fast WordPress theme designed after the Readhub style. Features custom logo, menus, sidebars, related posts, and a daily newspaper page template. Fully compatible with WordPress 7.0 and modern 6.x releases.
Version: 1.0.0
Requires at least: 5.6
Tested up to: 7.0
Requires PHP: 7.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: readhub
*/

/* ==========================================================================
   1. Theme Variables & Base Reset
   ========================================================================== */
:root {
    --primary-color: #2463e2;
    --primary-hover: #1d4ed8;
    --bg-color: #ffffff;
    --bg-secondary: #f4f5f6;
    --text-primary: #1e1f20;
    --text-secondary: #86909c;
    --text-body: #4e5969;
    --border-color: #ebebeb;
    --border-light: #f0f0f2;
    --border-radius: 4px;
    --max-width: 1120px;
    --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --transition-speed: 0.2s;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-body);
    font-size: 14px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ==========================================================================
   2. Layout & Typography
   ========================================================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

.site-main {
    padding: 24px 0 60px 0;
}

.layout-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 48px;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.4;
}

/* ==========================================================================
   3. Header & Navigation
   ========================================================================== */
.site-header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 60px;
}

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

.site-branding {
    display: flex;
    align-items: center;
}

.site-branding a {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.site-branding img.custom-logo {
    max-height: 28px;
    width: auto;
}

.main-navigation {
    display: flex;
    align-items: center;
    height: 100%;
    margin-left: 40px;
    flex-grow: 1;
}

.main-navigation ul {
    list-style: none;
    display: flex;
    gap: 24px;
    align-items: center;
    height: 100%;
}

.main-navigation li {
    display: inline-block;
}

.main-navigation a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-body);
    padding: 8px 0;
    position: relative;
}

.main-navigation a:hover,
.main-navigation .current-menu-item > a,
.main-navigation .current_page_item > a {
    color: var(--primary-color);
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Search Bar in Header */
.header-search-form {
    position: relative;
    display: flex;
    align-items: center;
}

.header-search-form input[type="search"] {
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 6px 12px 6px 32px;
    font-size: 13px;
    outline: none;
    width: 160px;
    transition: width var(--transition-speed) ease, border-color var(--transition-speed) ease;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.header-search-form input[type="search"]:focus {
    width: 220px;
    border-color: var(--primary-color);
    background-color: var(--bg-color);
}

.header-search-form .search-submit-icon {
    position: absolute;
    left: 10px;
    color: var(--text-secondary);
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-search-form .search-submit-icon svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

.btn-login {
    font-size: 14px;
    color: var(--text-body);
    font-weight: 500;
    padding: 6px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

.btn-login:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(36, 99, 226, 0.04);
}

/* ==========================================================================
   4. Post Lists (Index / Archive)
   ========================================================================== */
.post-list {
    display: flex;
    flex-direction: column;
}

.post-item {
    padding: 24px 0;
    border-bottom: 1px solid var(--border-light);
}

.post-item:first-child {
    padding-top: 0;
}

.post-item:last-child {
    border-bottom: none;
}

.post-item-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.5;
}

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

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

.post-item-excerpt {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.7;
    margin-bottom: 12px;
    word-break: break-all;
}

.post-item-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--text-secondary);
}

.post-item-meta .meta-cat {
    color: var(--primary-color);
    font-weight: 500;
}

/* ==========================================================================
   5. Single Post Page Style
   ========================================================================== */
.article-container {
    padding-bottom: 40px;
}

.article-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 12px;
}

.article-meta {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.article-meta .meta-cat {
    color: var(--primary-color);
    font-weight: 500;
}

.article-content {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 40px;
}

.article-content p {
    margin-bottom: 20px;
}

/* Related News Links (相关报道) */
.related-links-section {
    border-top: 1px solid var(--border-light);
    padding-top: 24px;
    margin-bottom: 40px;
}

.related-links-title {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 16px;
}

.related-links-list {
    list-style: none;
}

.related-link-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 14px;
}

.related-link-icon {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    margin-top: 4px;
    flex-shrink: 0;
}

.related-link-icon svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

.related-link-text {
    color: var(--text-body);
    line-height: 1.5;
}

.related-link-text a:hover {
    color: var(--primary-color);
}

.related-link-source {
    color: var(--text-secondary);
    margin-left: 8px;
    font-size: 12px;
}

.related-link-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    margin-top: 10px;
    background: none;
    border: none;
    padding: 0;
}

.related-link-more-btn:hover {
    color: var(--primary-color);
}

.related-link-more-btn svg {
    width: 12px;
    height: 12px;
    fill: currentColor;
    transition: transform var(--transition-speed) ease;
}

.related-link-more-btn.expanded svg {
    transform: rotate(180deg);
}

.related-link-item.hidden-link {
    display: none;
}

/* Topic Timeline (话题追踪) */
.topic-timeline-section {
    border-top: 1px solid var(--border-light);
    padding-top: 24px;
}

.timeline-section-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    cursor: pointer;
}

.timeline-section-title svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.timeline-section-title .toggle-icon {
    margin-left: auto;
    color: var(--text-secondary);
    transition: transform var(--transition-speed) ease;
}

.timeline-section-title.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.timeline-list-wrapper {
    transition: max-height var(--transition-speed) ease, opacity var(--transition-speed) ease;
    overflow: hidden;
}

.timeline-section-title.collapsed + .timeline-list-wrapper {
    max-height: 0;
    opacity: 0;
    padding: 0;
}

.timeline-list {
    position: relative;
    padding-left: 20px;
    list-style: none;
}

.timeline-list::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 24px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -20px;
    top: 6px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: 2px solid var(--bg-color);
    box-sizing: content-box;
    z-index: 1;
}

.timeline-content {
    display: flex;
    gap: 16px;
    font-size: 14px;
    line-height: 1.5;
}

.timeline-date {
    color: var(--text-secondary);
    font-family: monospace, sans-serif;
    flex-shrink: 0;
    width: 80px;
}

.timeline-title {
    color: var(--text-body);
    font-weight: 500;
}

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

/* ==========================================================================
   6. Sidebar & Widget Styling
   ========================================================================== */
.sidebar-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.widget {
    background-color: var(--bg-color);
    margin-bottom: 10px;
}

.widget-title {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid transparent;
}

/* 24小时热榜 (Trending Widget Style) */
.widget_trending_posts ul {
    list-style: none;
    counter-reset: hot-counter;
}

.widget_trending_posts li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 14px;
    font-size: 13px;
    line-height: 1.5;
}

.widget_trending_posts li::before {
    counter-increment: hot-counter;
    content: counter(hot-counter);
    position: absolute;
    left: 0;
    top: 1px;
    font-weight: 700;
    font-size: 13px;
    color: var(--text-secondary);
    width: 16px;
    text-align: left;
}

.widget_trending_posts li:nth-child(1)::before,
.widget_trending_posts li:nth-child(2)::before,
.widget_trending_posts li:nth-child(3)::before {
    color: #f53f3f; /* Vibrant red for top 3 hot posts */
}

.widget_trending_posts li a {
    color: var(--text-primary);
    font-weight: 500;
}

.widget_trending_posts li a:hover {
    color: var(--primary-color);
}

.widget-more-link {
    display: block;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 8px;
    font-size: 13px;
    color: var(--text-body);
    font-weight: 500;
    margin-top: 20px;
    background-color: var(--bg-color);
    transition: all var(--transition-speed) ease;
}

.widget-more-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Sponsor Widget Card */
.widget_sponsor_card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sponsor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-secondary);
}

.sponsor-join {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--primary-color);
}

.sponsor-item-card {
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    min-height: 80px;
    transition: border-color var(--transition-speed) ease;
}

.sponsor-item-card:hover {
    border-color: var(--primary-color);
}

.sponsor-item-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sponsor-item-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.sponsor-item-desc {
    color: var(--text-secondary);
    font-size: 12px;
}

.sponsor-item-logo {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.sponsor-item-logo.rect {
    width: 60px;
    height: auto;
    border-radius: 0;
}

/* QR Code widgets */
.widget_qrcode_card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.qrcode-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.qrcode-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.qrcode-desc {
    color: var(--text-secondary);
    font-size: 12px;
}

.qrcode-image {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
}

/* Industry tags widget */
.widget_industry_tags ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.widget_industry_tags li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    padding: 6px 0;
}

.tag-name {
    color: var(--text-primary);
    font-weight: 500;
}

.tag-subscribe {
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: color var(--transition-speed) ease;
}

.tag-subscribe:hover {
    color: var(--primary-color);
}

/* General fallback widget list items */
.widget ul {
    list-style: none;
}

.widget li {
    padding: 8px 0;
    border-bottom: 1px dashed var(--border-light);
    font-size: 13.5px;
}

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

.widget li a {
    color: var(--text-body);
}

.widget li a:hover {
    color: var(--primary-color);
}

/* ==========================================================================
   7. Daily Newspaper Page (每日早报)
   ========================================================================== */
.daily-body-bg {
    background-color: var(--bg-secondary) !important;
}

.daily-page-container {
    max-width: 720px;
    margin: 40px auto 60px auto;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 40px 48px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.daily-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 24px;
}

.daily-header-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.daily-header-date {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.daily-header-date .date-number {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
    font-family: monospace, sans-serif;
}

.daily-divider {
    border-top: 3px double var(--primary-color);
    border-bottom: 1px solid var(--border-color);
    padding-top: 4px;
    margin-bottom: 32px;
}

.daily-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.daily-item {
    display: flex;
    flex-direction: column;
}

.daily-item-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    line-height: 1.5;
}

.daily-item-number {
    color: var(--primary-color);
    font-family: monospace, sans-serif;
    font-size: 17px;
    font-weight: 700;
    flex-shrink: 0;
}

.daily-item-title-text a:hover {
    color: var(--primary-color);
}

.daily-item-content {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.75;
    padding-left: 32px; /* indentation aligned under title text */
}

.daily-item-content a {
    color: var(--primary-color);
    border-bottom: 1px solid rgba(36, 99, 226, 0.2);
    padding-bottom: 1px;
}

.daily-item-content a:hover {
    border-bottom-color: var(--primary-color);
}

/* ==========================================================================
   8. Floating Right Action Toolbar
   ========================================================================== */
.floating-toolbar {
    position: fixed;
    right: 40px;
    bottom: 120px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 90;
}

.floating-btn {
    width: 40px;
    height: 40px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-speed) ease;
}

.floating-btn:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(36, 99, 226, 0.1);
    transform: translateY(-2px);
}

.floating-btn svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* ==========================================================================
   9. Footer & Utilities
   ========================================================================== */
.site-footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
    padding: 30px 0;
    color: var(--text-secondary);
    font-size: 13px;
    text-align: center;
}

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

/* Navigation inside Footer */
.footer-navigation ul {
    list-style: none;
    display: flex;
    gap: 16px;
}

.footer-navigation a {
    color: var(--text-secondary);
}

.footer-navigation a:hover {
    color: var(--primary-color);
}

.scroll-top-btn {
    display: none; /* Managed dynamically via JavaScript or basic anchor */
}

/* Comments Style */
.comments-area {
    margin-top: 40px;
    border-top: 1px solid var(--border-light);
    padding-top: 24px;
}

.comment-list {
    list-style: none;
    margin-bottom: 30px;
}

.comment-body {
    padding: 16px 0;
    border-bottom: 1px dashed var(--border-light);
}

.comment-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.comment-content {
    font-size: 14px;
    color: var(--text-primary);
}

.comment-respond {
    margin-top: 20px;
}

.comment-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.comment-form textarea,
.comment-form input[type="text"],
.comment-form input[type="email"] {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 10px;
    font-size: 14px;
    outline: none;
    font-family: inherit;
}

.comment-form textarea:focus,
.comment-form input[type="text"]:focus,
.comment-form input[type="email"]:focus {
    border-color: var(--primary-color);
}

.comment-form .submit {
    align-self: flex-start;
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 8px 20px;
    font-weight: 500;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-speed) ease;
}

.comment-form .submit:hover {
    background-color: var(--primary-hover);
}

/* ==========================================================================
   10. Responsive Media Queries
   ========================================================================== */
@media screen and (max-width: 992px) {
    .layout-grid {
        gap: 32px;
    }
}

@media screen and (max-width: 768px) {
    .layout-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .sidebar-container {
        border-top: 1px solid var(--border-color);
        padding-top: 30px;
    }
    
    .main-navigation {
        display: none; /* Standard mobile menu toggle can be implemented, or vertical stack */
    }
    
    .floating-toolbar {
        right: 20px;
        bottom: 80px;
    }
    
    .daily-page-container {
        padding: 30px 20px;
        margin: 20px 10px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .footer-navigation ul {
        justify-content: center;
    }
}