/*
Theme Name: Timeline - 时间线新闻主题
Theme URI: https://www.fasto.cc.cd
Author: John Max
Author URI: https://www.fasto.cc.cd
Description: 一款专注于记录社会热点新闻的时间线主题，支持用户投稿、三级用户权限系统，以时间线方式展示新闻事件。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: timeline
*/

/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    --color-primary: #1a56db;
    --color-primary-dark: #1e40af;
    --color-secondary: #374151;
    --color-accent: #f59e0b;
    --color-light: #f9fafb;
    --color-dark: #111827;
    --color-white: #ffffff;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    --container-width: 1200px;
    --content-width: 800px;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
}

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

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

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-light);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.75;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

/* ============================================
   Layout
   ============================================ */
.wp-site-blocks {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-content {
    flex: 1;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.content-narrow {
    max-width: var(--content-width);
    margin: 0 auto;
}

/* ============================================
   Header
   ============================================ */
.site-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: var(--container-width);
    margin: 0 auto;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.site-logo .logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: bold;
}

.main-navigation {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-menu a {
    color: var(--color-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-fast);
}

.nav-menu a:hover::after,
.nav-menu .current-menu-item a::after {
    width: 100%;
}

.nav-menu a:hover,
.nav-menu .current-menu-item a {
    color: var(--color-primary);
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-secondary);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background: var(--color-gray-100);
    color: var(--color-dark);
}

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

.btn-accent:hover {
    background: #d97706;
    color: var(--color-white);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

/* ============================================
   Timeline Layout
   ============================================ */
.timeline-container {
    position: relative;
    padding: var(--spacing-2xl) 0;
}

.timeline-container::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-gray-200);
}

.timeline-date-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.timeline-date-header .date-label {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: calc(50% + var(--spacing-xl));
    position: relative;
    margin-bottom: var(--spacing-2xl);
}

.timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: 0;
    padding-left: calc(50% + var(--spacing-xl));
}

.timeline-item::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--color-white);
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    top: var(--spacing-lg);
    right: calc(50% - 8px);
    z-index: 1;
}

.timeline-item:nth-child(even)::before {
    right: auto;
    left: calc(50% - 8px);
}

.timeline-item:hover::before {
    background: var(--color-primary);
    transform: scale(1.2);
    transition: all var(--transition-fast);
}

.timeline-content {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    max-width: 500px;
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.timeline-content .entry-thumbnail {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.timeline-content .entry-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.timeline-content:hover .entry-thumbnail img {
    transform: scale(1.05);
}

.timeline-content .entry-body {
    padding: var(--spacing-lg);
}

.timeline-content .entry-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.timeline-content .entry-meta .entry-date {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.timeline-content .entry-meta .entry-category {
    background: var(--color-gray-100);
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.timeline-content .entry-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.timeline-content .entry-title a {
    color: var(--color-dark);
}

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

.timeline-content .entry-excerpt {
    color: var(--color-gray-600);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* ============================================
   Cards & Grid
   ============================================ */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.post-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.post-card .card-thumbnail {
    height: 180px;
    overflow: hidden;
}

.post-card .card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.post-card:hover .card-thumbnail img {
    transform: scale(1.05);
}

.post-card .card-body {
    padding: var(--spacing-lg);
}

.post-card .card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

.post-card .card-title {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.post-card .card-title a {
    color: var(--color-dark);
}

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

.post-card .card-excerpt {
    color: var(--color-gray-600);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ============================================
   Date Navigator
   ============================================ */
.date-navigator {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
}

.date-navigator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.date-navigator-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-dark);
}

.date-navigator-nav {
    display: flex;
    gap: var(--spacing-sm);
}

.date-picker-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-xs);
}

.date-picker-day {
    text-align: center;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
}

.date-picker-day:hover {
    background: var(--color-gray-100);
}

.date-picker-day.is-today {
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 600;
}

.date-picker-day.has-events {
    position: relative;
}

.date-picker-day.has-events::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

.date-picker-day.is-selected {
    background: var(--color-gray-200);
    font-weight: 600;
}

/* ============================================
   Single Post
   ============================================ */
.single-header {
    background: var(--color-white);
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-2xl);
}

.single-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

.single-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    color: var(--color-gray-500);
    font-size: 0.9375rem;
}

.single-meta .meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.single-content {
    font-size: 1.0625rem;
    line-height: 1.8;
}

.single-content p {
    margin-bottom: var(--spacing-lg);
}

.single-content h2 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
}

.single-content img {
    border-radius: var(--radius-md);
    margin: var(--spacing-xl) 0;
}

.single-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    font-style: italic;
    color: var(--color-gray-600);
}

/* ============================================
   Submission Form
   ============================================ */
.submission-form {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    max-width: 700px;
    margin: var(--spacing-2xl) auto;
}

.submission-form .form-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

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

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--color-dark);
}

.form-label .required {
    color: var(--color-error);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-body);
    transition: all var(--transition-fast);
    background: var(--color-white);
}

.form-input