/*
Theme Name: Flavor Starter
Theme URI: https://example.com/flavor-starter
Author: Your Name
Author URI: https://example.com
Description: 一个现代化的 WordPress 个人博客主题，参考 Begin 主题风格设计。支持博客和杂志布局、文章统计、用户系统、响应式设计和 SEO 优化。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: flavor-starter
Tags: blog, one-column, two-columns, right-sidebar, custom-colors, custom-menu, custom-logo, featured-images, footer-widgets, full-width-template, post-formats, sticky-post, theme-options, threaded-comments, translation-ready

Flavor Starter 是一个功能丰富的现代化 WordPress 主题，专为个人博客设计。
*/

/* ==========================================================================
   CSS 变量和基础设置
   ========================================================================== */

:root {
    /* 主题色彩 */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-accent: #f59e0b;
    
    /* 文本颜色 */
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;
    
    /* 背景颜色 */
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #1e293b;
    
    /* 边框颜色 */
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-serif: Georgia, "Times New Roman", serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", monospace;
    
    /* 字体大小 */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    
    /* 布局 */
    --container-max: 1200px;
    --sidebar-width: 300px;
}

/* ==========================================================================
   重置和基础样式
   ========================================================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-md);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin: 0 0 var(--spacing-md);
}

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;
}

ul, ol {
    margin: 0 0 var(--spacing-md);
    padding-left: var(--spacing-xl);
}

/* ==========================================================================
   布局容器
   ========================================================================== */

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

.site-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-content {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* ==========================================================================
   主布局 - CSS Grid
   ========================================================================== */

.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .main-layout {
        grid-template-columns: 1fr var(--sidebar-width);
    }
}

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

.sidebar {
    display: none;
}

@media (min-width: 768px) {
    .sidebar {
        display: block;
    }
}

/* ==========================================================================
   网站头部
   ========================================================================== */

.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

/* 网站品牌 */
.site-branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.site-logo img {
    max-height: 50px;
    width: auto;
}

.site-identity {
    display: flex;
    flex-direction: column;
}

.site-title {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: 700;
    line-height: 1.2;
}

.site-title a {
    color: var(--color-text);
}

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

.site-description {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ==========================================================================
   主导航菜单
   ========================================================================== */

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

/* 菜单切换按钮 - 移动端 */
.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    background: var(--color-bg-alt);
}

.menu-toggle-icon {
    position: relative;
    width: 20px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

.menu-toggle-icon::before,
.menu-toggle-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

.menu-toggle-icon::before {
    top: -6px;
}

.menu-toggle-icon::after {
    bottom: -6px;
}

/* 菜单打开状态 */
.menu-toggle[aria-expanded="true"] .menu-toggle-icon {
    background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-icon::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* 主菜单 */
.primary-menu {
    display: none;
    list-style: none;
    margin: 0;
    padding: 0;
}

.primary-menu.menu-open,
.main-navigation.toggled .primary-menu {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md);
}

.primary-menu li {
    margin: 0;
    padding: 0;
}

.primary-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

/* 子菜单 */
.primary-menu .sub-menu {
    list-style: none;
    margin: 0;
    padding: 0 0 0 var(--spacing-md);
}

.primary-menu .sub-menu a {
    font-size: var(--font-size-sm);
    font-weight: 400;
}

/* 桌面端导航 */
@media (min-width: 768px) {
    .menu-toggle {
        display: none;
    }
    
    .primary-menu {
        display: flex;
        align-items: center;
        gap: var(--spacing-xs);
    }
    
    .primary-menu a {
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: var(--radius-md);
    }
    
    .primary-menu a:hover,
    .primary-menu .current-menu-item > a {
        background: var(--color-bg-alt);
    }
    
    /* 桌面端子菜单 */
    .primary-menu li {
        position: relative;
    }
    
    .primary-menu .sub-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 200px;
        padding: var(--spacing-sm) 0;
        background: var(--color-bg);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        z-index: 100;
    }
    
    .primary-menu li:hover > .sub-menu {
        display: block;
    }
    
    .primary-menu .sub-menu a {
        padding: var(--spacing-sm) var(--spacing-lg);
        border-radius: 0;
    }
    
    .primary-menu .sub-menu a:hover {
        background: var(--color-bg-alt);
    }
}

/* ==========================================================================
   头部操作区
   ========================================================================== */

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

.btn-login {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    background: transparent;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-login:hover {
    color: #fff;
    background: var(--color-primary);
}

.user-menu {
    display: flex;
    align-items: center;
}

.user-avatar img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

/* ==========================================================================
   网站页脚
   ========================================================================== */

.site-footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-2xl) 0;
    margin-top: auto;
}

.footer-widgets {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
    .footer-widgets {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-widgets .widget {
    background: transparent;
    padding: 0;
    box-shadow: none;
}

.footer-widgets .widget-title {
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

.footer-widgets .widget a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-widgets .widget a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.site-info {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.site-info a {
    color: rgba(255, 255, 255, 0.8);
}

.site-info a:hover {
    color: #fff;
}

/* ==========================================================================
   辅助类
   ========================================================================== */

.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    word-wrap: normal !important;
}

.screen-reader-text:focus {
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    clip: auto !important;
    clip-path: none;
    color: var(--color-text);
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    height: auto;
    left: var(--spacing-sm);
    line-height: normal;
    padding: var(--spacing-md) var(--spacing-lg);
    text-decoration: none;
    top: var(--spacing-sm);
    width: auto;
    z-index: 100000;
}

.skip-link {
    position: fixed;
    top: -100px;
    left: var(--spacing-md);
    z-index: 9999;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-md);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-md);
}

/* ==========================================================================
   页脚小工具网格
   ========================================================================== */

.footer-widgets-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .footer-widgets-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-widget-area .widget {
    background: transparent;
    padding: 0;
    box-shadow: none;
}

.footer-widget-area .widget-title {
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

.footer-widget-area .widget a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-widget-area .widget a:hover {
    color: #fff;
}

.footer-widget-area .widget li {
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

/* 页脚底部 */
.footer-bottom-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

@media (min-width: 768px) {
    .footer-bottom-inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.copyright p {
    margin: 0;
}

/* 页脚导航 */
.footer-navigation .footer-menu {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-navigation .footer-menu a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer-navigation .footer-menu a:hover {
    color: #fff;
}

/* 社交媒体导航 */
.social-navigation .social-menu {
    display: flex;
    gap: var(--spacing-sm);
    list-style: none;
    margin: 0;
    padding: 0;
}

.social-navigation .social-menu a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-fast);
}

.social-navigation .social-menu a:hover {
    background: var(--color-primary);
    color: #fff;
}