/*!
Theme Name: Yi I Ching Theme
Theme URI: https://example.com/yi-theme/
Author: Yi Team
Author URI: https://example.com/
Description: 用于东方文化官网的统一基础样式
Version: 1.0
Requires at least: WordPress 5.9
Tested up to: WordPress 6.0
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: LICENSE
Text Domain: yi
Tags: custom, responsive, eastern, culture, minimal

This theme, like WordPress, is licensed under the GPL.
Use it to make something cool, have fun, and share what you've learned.

Yi is based on Underscores https://underscores.me/, (C) 2012-2020 Automattic, Inc.
Underscores is distributed under the terms of the GNU GPL v2 or later.

Normalizing styles have been helped along thanks to the fine work of
Nicolas Gallagher and Jonathan Neal https://necolas.github.io/normalize.css/
*/

/*--------------------------------------------------------------
>>> TABLE OF CONTENTS:
----------------------------------------------------------------
# Generic
	- Normalize
	- Box sizing
# Base
	- Typography
	- Elements
	- Links
	- Forms
## Layouts
# Components
	- Navigation
	- Posts and pages
	- Comments
	- Widgets
	- Media
	- Captions
	- Galleries
# plugins
	- Jetpack infinite scroll
# Utilities
	- Accessibility
	- Alignments

--------------------------------------------------------------*/

/*--------------------------------------------------------------
# Generic
--------------------------------------------------------------*/

/* Normalize
--------------------------------------------- */

/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */

/* Document
	 ========================================================================== */

/**
 * 1. Correct the line height in all browsers.
 * 2. Prevent adjustments of font size after orientation changes in iOS.
 */
html {
	line-height: 1.15;
	-webkit-text-size-adjust: 100%;
}

/* Sections
	 ========================================================================== */

/**
 * Remove the margin in all browsers.
 */
body {
	margin: 0;
}

/**
 * Render the `main` element consistently in IE.
 */
main {
	display: block;
}

/**
 * Correct the font size and margin on `h1` elements within `section` and
 * `article` contexts in Chrome, Firefox, and Safari.
 */
h1 {
	font-size: 2em;
	margin: 0.67em 0;
}

/* Grouping content
	 ========================================================================== */

/**
 * 1. Add the correct box sizing in Firefox.
 * 2. Show the overflow in Edge and IE.
 */
hr {
	box-sizing: content-box;
	height: 0;
	overflow: visible;
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */
pre {
	font-family: monospace, monospace;
	font-size: 1em;
}

/* Text-level semantics
	 ========================================================================== */

/**
 * Remove the gray background on active links in IE 10.
 */
a {
	background-color: transparent;
}

/**
 * 1. Remove the bottom border in Chrome 57-
 * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
 */
abbr[title] {
	border-bottom: none;
	text-decoration: underline;
	text-decoration: underline dotted;
}

/**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */
b,
strong {
	font-weight: bolder;
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */
code,
kbd,
samp {
	font-family: monospace, monospace;
	font-size: 1em;
}

/**
 * Add the correct font size in all browsers.
 */
small {
	font-size: 80%;
}

/**
 * Prevent `sub` and `sup` elements from affecting the line height in
 * all browsers.
 */
sub,
sup {
	font-size: 75%;
	line-height: 0;
	position: relative;
	vertical-align: baseline;
}

sub {
	bottom: -0.25em;
}

sup {
	top: -0.5em;
}

/* Embedded content
	 ========================================================================== */

/**
 * Remove the border on images inside links in IE 10.
 */
img {
	border-style: none;
}

/* Forms
	 ========================================================================== */

/**
 * 1. Change the font styles in all browsers.
 * 2. Remove the margin in Firefox and Safari.
 */
button,
input,
optgroup,
select,
textarea {
	font-family: inherit;
	font-size: 100%;
	line-height: 1.15;
	margin: 0;
}

/**
 * Show the overflow in IE.
 * 1. Show the overflow in Edge.
 */
button,
input {
	overflow: visible;
}

/**
 * Remove the inheritance of text transform in Edge, Firefox, and IE.
 * 1. Remove the inheritance of text transform in Firefox.
 */
button,
select {
	text-transform: none;
}

/**
 * Correct the inability to style clickable types in iOS and Safari.
 */
button,
[type="button"],
[type="reset"],
[type="submit"] {
	-webkit-appearance: button;
}

/**
 * Remove the inner border and padding in Firefox.
 */
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
	border-style: none;
	padding: 0;
}

/**
 * Restore the focus styles unset by the previous rule.
 */
button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
	outline: 1px dotted ButtonText;
}

/**
 * Correct the padding in Firefox.
 */
fieldset {
	padding: 0.35em 0.75em 0.625em;
}

/**
 * 1. Correct the text wrapping in Edge and IE.
 * 2. Correct the color inheritance from `fieldset` elements in IE.
 * 3. Remove the padding so developers are not caught out when they zero out
 *		`fieldset` elements in all browsers.
 */
legend {
	box-sizing: border-box;
	color: inherit;
	display: table;
	max-width: 100%;
	padding: 0;
	white-space: normal;
}

/**
 * Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */
progress {
	vertical-align: baseline;
}

/**
 * Remove the default vertical scrollbar in IE 10+.
 */
textarea {
	overflow: auto;
}

/**
 * 1. Add the correct box sizing in IE 10.
 * 2. Remove the padding in IE 10.
 */
[type="checkbox"],
[type="radio"] {
	box-sizing: border-box;
	padding: 0;
}

/**
 * Correct the cursor style of increment and decrement buttons in Chrome.
 */
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
	height: auto;
}

/**
 * 1. Correct the odd appearance in Chrome and Safari.
 * 2. Correct the outline style in Safari.
 */
[type="search"] {
	-webkit-appearance: textfield;
	outline-offset: -2px;
}

/**
 * Remove the inner padding in Chrome and Safari on macOS.
 */
[type="search"]::-webkit-search-decoration {
	-webkit-appearance: none;
}

/**
 * 1. Correct the inability to style clickable types in iOS and Safari.
 * 2. Change font properties to `inherit` in Safari.
 */
::-webkit-file-upload-button {
	-webkit-appearance: button;
	font: inherit;
}

/* Interactive
	 ========================================================================== */

/*
 * Add the correct display in Edge, IE 10+, and Firefox.
 */
details {
	display: block;
}

/*
 * Add the correct display in all browsers.
 */
summary {
	display: list-item;
}

/* Misc
	 ========================================================================== */

/**
 * Add the correct display in IE 10+.
 */
template {
	display: none;
}

/**
 * Add the correct display in IE 10.
 */
[hidden] {
	display: none;
}

/* Box sizing
--------------------------------------------- */

/* Inherit box-sizing to more easily change it's value on a component level.
@link http://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/ */
*,
*::before,
*::after {
	box-sizing: inherit;
}

html {
	box-sizing: border-box;
}

/*--------------------------------------------------------------
# Base
--------------------------------------------------------------*/

/* Typography
--------------------------------------------- */
body,
button,
input,
select,
optgroup,
textarea {
	color: #404040;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
	font-size: 1rem;
	line-height: 1.5;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	clear: both;
}

p {
	margin-bottom: 1.5em;
}

dfn,
cite,
em,
i {
	font-style: italic;
}

blockquote {
	margin: 0 1.5em;
}

address {
	margin: 0 0 1.5em;
}

pre {
	background: #eee;
	font-family: "Courier 10 Pitch", courier, monospace;
	line-height: 1.6;
	margin-bottom: 1.6em;
	max-width: 100%;
	overflow: auto;
	padding: 1.6em;
}

code,
kbd,
tt,
var {
	font-family: monaco, consolas, "Andale Mono", "DejaVu Sans Mono", monospace;
}

abbr,
acronym {
	border-bottom: 1px dotted #666;
	cursor: help;
}

mark,
ins {
	background: #fff9c0;
	text-decoration: none;
}

big {
	font-size: 125%;
}

/* Elements
--------------------------------------------- */
body {
	background: #fff;
}

hr {
	background-color: #ccc;
	border: 0;
	height: 1px;
	margin-bottom: 1.5em;
}

ul,
ol {
	margin: 0 0 1.5em 3em;
}

ul {
	list-style: disc;
}

ol {
	list-style: decimal;
}

li > ul,
li > ol {
	margin-bottom: 0;
	margin-left: 1.5em;
}

dt {
	font-weight: 700;
}

dd {
	margin: 0 1.5em 1.5em;
}

/* Make sure embeds and iframes fit their containers. */
embed,
iframe,
object {
	max-width: 100%;
}

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

figure {
	margin: 1em 0;
}

table {
	margin: 0 0 1.5em;
	width: 100%;
}

/* Links
--------------------------------------------- */
a {
	color: #4169e1;
}

a:visited {
	color: #800080;
}

a:hover,
a:focus,
a:active {
	color: #191970;
}

a:focus {
	outline: thin dotted;
}

a:hover,
a:active {
	outline: 0;
}

/* Forms
--------------------------------------------- */
button,
input[type="button"],
input[type="reset"],
input[type="submit"] {
	border: 1px solid;
	border-color: #ccc #ccc #bbb;
	border-radius: 3px;
	background: #e6e6e6;
	color: rgba(0, 0, 0, 0.8);
	line-height: 1;
	padding: 0.6em 1em 0.4em;
}

button:hover,
input[type="button"]:hover,
input[type="reset"]:hover,
input[type="submit"]:hover {
	border-color: #ccc #bbb #aaa;
}

button:active,
button:focus,
input[type="button"]:active,
input[type="button"]:focus,
input[type="reset"]:active,
input[type="reset"]:focus,
input[type="submit"]:active,
input[type="submit"]:focus {
	border-color: #aaa #bbb #bbb;
}

input[type="text"],
input[type="email"],
input[type="url"],
input[type="password"],
input[type="search"],
input[type="number"],
input[type="tel"],
input[type="range"],
input[type="date"],
input[type="month"],
input[type="week"],
input[type="time"],
input[type="datetime"],
input[type="datetime-local"],
input[type="color"],
textarea {
	color: #666;
	border: 1px solid #ccc;
	border-radius: 3px;
	padding: 3px;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="url"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
input[type="number"]:focus,
input[type="tel"]:focus,
input[type="range"]:focus,
input[type="date"]:focus,
input[type="month"]:focus,
input[type="week"]:focus,
input[type="time"]:focus,
input[type="datetime"]:focus,
input[type="datetime-local"]:focus,
input[type="color"]:focus,
textarea:focus {
	color: #111;
}

select {
	border: 1px solid #ccc;
}

textarea {
	width: 100%;
}

/*--------------------------------------------------------------
# Layouts
--------------------------------------------------------------*/

/*--------------------------------------------------------------
# Components
--------------------------------------------------------------*/

/* Navigation
--------------------------------------------- */
.main-navigation {
	display: block;
	width: 100%;
}

.main-navigation ul {
	display: none;
	list-style: none;
	margin: 0;
	padding-left: 0;
}

.main-navigation ul ul {
	box-shadow: 0 3px 3px rgba(0, 0, 0, 0.2);
	float: left;
	position: absolute;
	top: 100%;
	left: -999em;
	z-index: 99999;
}

.main-navigation ul ul ul {
	left: -999em;
	top: 0;
}

.main-navigation ul ul li:hover > ul,
.main-navigation ul ul li.focus > ul {
	display: block;
	left: auto;
}

.main-navigation ul ul a {
	width: 200px;
}

.main-navigation ul li:hover > ul,
.main-navigation ul li.focus > ul {
	left: auto;
}

.main-navigation li {
	position: relative;
}

.main-navigation a {
	display: block;
	text-decoration: none;
}

/* Small menu. */
.menu-toggle,
.main-navigation.toggled ul {
	display: block;
}

@media screen and (min-width: 37.5em) {

	.menu-toggle {
		display: none;
	}

	.main-navigation ul {
		display: flex;
	}
}

.site-main .comment-navigation,
.site-main
.posts-navigation,
.site-main
.post-navigation {
	margin: 0 0 1.5em;
}

.comment-navigation .nav-links,
.posts-navigation .nav-links,
.post-navigation .nav-links {
	display: flex;
}

.comment-navigation .nav-previous,
.posts-navigation .nav-previous,
.post-navigation .nav-previous {
	flex: 1 0 50%;
}

.comment-navigation .nav-next,
.posts-navigation .nav-next,
.post-navigation .nav-next {
	text-align: end;
	flex: 1 0 50%;
}

/* Posts and pages
--------------------------------------------- */
.sticky {
	display: block;
}

.post,
.page {
	margin: 0 0 1.5em;
}

.updated:not(.published) {
	display: none;
}

.page-content,
.entry-content,
.entry-summary {
	margin: 1.5em 0 0;
}

.page-links {
	clear: both;
	margin: 0 0 1.5em;
}

/* Comments
--------------------------------------------- */
.comment-content a {
	word-wrap: break-word;
}

.bypostauthor {
	display: block;
}

/* Widgets
--------------------------------------------- */
.widget {
	margin: 0 0 1.5em;
}

.widget select {
	max-width: 100%;
}

/* Media
--------------------------------------------- */
.page-content .wp-smiley,
.entry-content .wp-smiley,
.comment-content .wp-smiley {
	border: none;
	margin-bottom: 0;
	margin-top: 0;
	padding: 0;
}

/* Make sure logo link wraps around logo image. */
.custom-logo-link {
	display: inline-block;
}

/* Captions
--------------------------------------------- */
.wp-caption {
	margin-bottom: 1.5em;
	max-width: 100%;
}

.wp-caption img[class*="wp-image-"] {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

.wp-caption .wp-caption-text {
	margin: 0.8075em 0;
}

.wp-caption-text {
	text-align: center;
}

/* Galleries
--------------------------------------------- */
.gallery {
	margin-bottom: 1.5em;
	display: grid;
	grid-gap: 1.5em;
}

.gallery-item {
	display: inline-block;
	text-align: center;
	width: 100%;
}

.gallery-columns-2 {
	grid-template-columns: repeat(2, 1fr);
}

.gallery-columns-3 {
	grid-template-columns: repeat(3, 1fr);
}

.gallery-columns-4 {
	grid-template-columns: repeat(4, 1fr);
}

.gallery-columns-5 {
	grid-template-columns: repeat(5, 1fr);
}

.gallery-columns-6 {
	grid-template-columns: repeat(6, 1fr);
}

.gallery-columns-7 {
	grid-template-columns: repeat(7, 1fr);
}

.gallery-columns-8 {
	grid-template-columns: repeat(8, 1fr);
}

.gallery-columns-9 {
	grid-template-columns: repeat(9, 1fr);
}

.gallery-caption {
	display: block;
}

/*--------------------------------------------------------------
# Plugins
--------------------------------------------------------------*/

/* Jetpack infinite scroll
--------------------------------------------- */

/* Hide the Posts Navigation and the Footer when Infinite Scroll is in use. */
.infinite-scroll .posts-navigation,
.infinite-scroll.neverending .site-footer {
	display: none;
}

/* Re-display the Theme Footer when Infinite Scroll has reached its end. */
.infinity-end.neverending .site-footer {
	display: block;
}

/*--------------------------------------------------------------
# Utilities
--------------------------------------------------------------*/

/* Accessibility
--------------------------------------------- */

/* Text meant only for screen readers. */
.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 !important;
	width: 1px;
	word-wrap: normal !important;
}

.screen-reader-text:focus {
	background-color: #f1f1f1;
	border-radius: 3px;
	box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
	clip: auto !important;
	clip-path: none;
	color: #21759b;
	display: block;
	font-size: 0.875rem;
	font-weight: 700;
	height: auto;
	left: 5px;
	line-height: normal;
	padding: 15px 23px 14px;
	text-decoration: none;
	top: 5px;
	width: auto;
	z-index: 100000;
}

/* Do not show the outline on the skip link target. */
#primary[tabindex="-1"]:focus {
	outline: 0;
}

/* Alignments
--------------------------------------------- */
.alignleft {

	/*rtl:ignore*/
	float: left;

	/*rtl:ignore*/
	margin-right: 1.5em;
	margin-bottom: 1.5em;
}

.alignright {

	/*rtl:ignore*/
	float: right;

	/*rtl:ignore*/
	margin-left: 1.5em;
	margin-bottom: 1.5em;
}

.aligncenter {
	clear: both;
	display: block;
	margin-left: auto;
	margin-right: auto;
	margin-bottom: 1.5em;
}

/* ====== 1. CSS 变量定义 ====== */
:root {
    /* 主色系 */
    --color-primary: #c83321; /* 朱砂红 */
    --color-primary-light: #e05242;
    --color-primary-dark: #9e2416;
    --color-gold: #d4af37; /* 金色 */
    --color-gold-light: #e9c767;
    --color-gold-dark: #a88a29;
    --color-green: #2c5545; /* 墨绿 */
    --color-green-light: #3e7862;
    --color-green-dark: #1c372d;
    
    /* 背景色 */
    --color-bg-main: #f9f5f0; /* 浅米白 */
    --color-bg-secondary: #f0e9e1;
    --color-bg-dark: #483c32; /* 暗棕 */
    --color-bg-light: #ffffff;
    
    /* 文本色 */
    --color-text-heading: #1a1a1a; /* 标题 */
    --color-text-body: #333333; /* 正文 */
    --color-text-muted: #6c757d; /* 灰色注释 */
    --color-text-light: #ffffff;
    
    /* 字体系列 */
    --font-primary: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-secondary: 'Noto Serif', 'Times New Roman', serif;
    
    /* 字体大小 */
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-xxl: 1.5rem;
    --font-size-xxxl: 2rem;
    --font-size-xxxxl: 2.5rem;
    
    /* 字重 */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    
    /* 间距单位 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    --spacing-xxxl: 4rem;
    
    /* 边框、圆角 */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-width: 1px;
    --border-width-lg: 2px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 容器宽度 */
    --container-max-width: 1200px;
    --container-padding: 1rem;
}

/* ====== 2. 全局基础样式 ====== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-body);
    background-color: var(--color-bg-main);
    overflow-x: hidden;
}

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

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

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

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    color: var(--color-text-heading);
    font-weight: var(--font-weight-bold);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-xxxxl);
}

h2 {
    font-size: var(--font-size-xxxl);
}

h3 {
    font-size: var(--font-size-xxl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 段落样式 */
p {
    margin-bottom: var(--spacing-md);
}

/* 英文引用、古文使用衬线字体 */
blockquote, .quote-en, .ancient-text {
    font-family: var(--font-secondary);
    font-style: italic;
}

/* 列表样式 */
ul, ol {
    margin: 0 0 var(--spacing-md) var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
}

/* 表格样式 */
table {
    width: 100%;
    margin-bottom: var(--spacing-lg);
    border-collapse: collapse;
}

th, td {
    padding: var(--spacing-sm);
    border: var(--border-width) solid #e0e0e0;
    text-align: left;
}

th {
    background-color: var(--color-bg-secondary);
    font-weight: var(--font-weight-bold);
}

/* ====== 3. 容器和布局 ====== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-xxl) 0;
}

.section-sm {
    padding: var(--spacing-lg) 0;
}

.section-lg {
    padding: var(--spacing-xxxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--color-primary);
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-sm);
}

.section-divider {
    height: 1px;
    background-color: rgba(0, 0, 0, 0.1);
    margin: var(--spacing-xl) 0;
}

/* 网格布局 */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.col {
    flex: 1 0 0%;
    padding: 0 15px;
}

.col-full {
    flex: 0 0 100%;
    max-width: 100%;
    padding: 0 15px;
}

.col-half {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 0 15px;
}

.col-third {
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
    padding: 0 15px;
}

.col-two-thirds {
    flex: 0 0 66.666667%;
    max-width: 66.666667%;
    padding: 0 15px;
}

.col-quarter {
    flex: 0 0 25%;
    max-width: 25%;
    padding: 0 15px;
}

/* ====== 4. 按钮样式 ====== */
.btn {
    display: inline-block;
    font-weight: var(--font-weight-medium);
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    line-height: 1.5;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.btn:focus, .btn:active {
    outline: none;
}

.btn-primary {
    color: var(--color-text-light);
    background-color: var(--color-primary);
    border: var(--border-width) solid var(--color-primary);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-text-light);
    text-decoration: none;
}

.btn-secondary {
    color: var(--color-text-body);
    background-color: transparent;
    border: var(--border-width) solid var(--color-text-body);
}

.btn-secondary:hover, .btn-secondary:focus {
    background-color: var(--color-text-body);
    color: var(--color-text-light);
    text-decoration: none;
}

.btn-gold {
    color: var(--color-text-light);
    background-color: var(--color-gold);
    border: var(--border-width) solid var(--color-gold);
}

.btn-gold:hover, .btn-gold:focus {
    background-color: var(--color-gold-dark);
    border-color: var(--color-gold-dark);
    color: var(--color-text-light);
    text-decoration: none;
}

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

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

.btn-round {
    border-radius: 50px;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ====== 5. 表单样式 ====== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: var(--font-weight-medium);
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text-body);
    background-color: var(--color-bg-light);
    background-clip: padding-box;
    border: var(--border-width) solid #ced4da;
    border-radius: var(--border-radius-sm);
    transition: border-color var(--transition-fast);
}

.form-control:focus {
    color: var(--color-text-body);
    background-color: var(--color-bg-light);
    border-color: var(--color-primary-light);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(200, 51, 33, 0.25);
}

.form-control::placeholder {
    color: var(--color-text-muted);
    opacity: 1;
}

textarea.form-control {
    height: auto;
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

.form-check {
    position: relative;
    display: block;
    padding-left: 1.25rem;
}

.form-check-input {
    position: absolute;
    margin-top: 0.3rem;
    margin-left: -1.25rem;
}

.form-check-label {
    margin-bottom: 0;
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.btn-submit {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border: none;
    cursor: pointer;
}

.btn-submit:hover {
    background-color: var(--color-primary-dark);
}

/* 表单验证样式 */
.is-valid {
    border-color: #28a745;
}

.is-invalid {
    border-color: #dc3545;
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: #dc3545;
}

.was-validated .form-control:invalid ~ .invalid-feedback,
.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

/* ====== 6. 辅助类 ====== */
/* 文本对齐 */
.text-center {
    text-align: center;
}

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

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

/* 文本颜色 */
.text-primary {
    color: var(--color-primary);
}

.text-muted {
    color: var(--color-text-muted);
}

.text-light {
    color: var(--color-text-light);
}

.text-dark {
    color: var(--color-text-heading);
}

.text-gold {
    color: var(--color-gold);
}

.text-green {
    color: var(--color-green);
}

.text-danger {
    color: #dc3545;
}

.text-success {
    color: #28a745;
}

/* 背景颜色 */
.bg-primary {
    background-color: var(--color-primary);
}

.bg-light {
    background-color: var(--color-bg-light);
}

.bg-secondary {
    background-color: var(--color-bg-secondary);
}

.bg-dark {
    background-color: var(--color-bg-dark);
}

.bg-gold {
    background-color: var(--color-gold);
}

.bg-green {
    background-color: var(--color-green);
}

/* 边距和间距 */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: var(--spacing-xs); }
.pt-2 { padding-top: var(--spacing-sm); }
.pt-3 { padding-top: var(--spacing-md); }
.pt-4 { padding-top: var(--spacing-lg); }
.pt-5 { padding-top: var(--spacing-xl); }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: var(--spacing-xs); }
.pb-2 { padding-bottom: var(--spacing-sm); }
.pb-3 { padding-bottom: var(--spacing-md); }
.pb-4 { padding-bottom: var(--spacing-lg); }
.pb-5 { padding-bottom: var(--spacing-xl); }

/* 显示与隐藏 */
.d-none {
    display: none !important;
}

.d-block {
    display: block !important;
}

.d-flex {
    display: flex !important;
}

.d-inline-block {
    display: inline-block !important;
}

/* Flex 辅助类 */
.flex-column {
    flex-direction: column !important;
}

.justify-content-start {
    justify-content: flex-start !important;
}

.justify-content-center {
    justify-content: center !important;
}

.justify-content-end {
    justify-content: flex-end !important;
}

.justify-content-between {
    justify-content: space-between !important;
}

.align-items-start {
    align-items: flex-start !important;
}

.align-items-center {
    align-items: center !important;
}

.align-items-end {
    align-items: flex-end !important;
}

/* 其他辅助类 */
.shadow-sm {
    box-shadow: var(--shadow-sm);
}

.shadow {
    box-shadow: var(--shadow-md);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

.rounded {
    border-radius: var(--border-radius-md);
}

.rounded-sm {
    border-radius: var(--border-radius-sm);
}

.rounded-lg {
    border-radius: var(--border-radius-lg);
}

.rounded-circle {
    border-radius: 50%;
}

.overflow-hidden {
    overflow: hidden;
}

.position-relative {
    position: relative;
}

.position-absolute {
    position: absolute;
}

.w-100 {
    width: 100%;
}

.h-100 {
    height: 100%;
}

.highlight {
    background-color: rgba(212, 175, 55, 0.2);
    padding: 2px 5px;
    border-radius: var(--border-radius-sm);
}

/* ====== 7. 可访问性样式 ====== */
/* 仅供屏幕阅读器访问 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* 焦点可见性 */
.focus-visible:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ====== 8. 响应式断点 ====== */
/* 仅定义断点，具体页面内容在各页面CSS文件中实现 */
/* Extra small devices (phones, 576px and down) */
@media (max-width: 576px) {
    html {
        font-size: 14px;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .col-half, .col-third, .col-quarter, .col-two-thirds {
        flex: 0 0 100%;
        max-width: 100%;
    }
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 768px) {
    .col-third, .col-quarter {
        flex: 0 0 50%;
        max-width: 50%;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 992px) {
    .container {
        max-width: 720px;
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1200px) {
    .container {
        max-width: 960px;
    }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        max-width: var(--container-max-width);
    }
}