:root {
  /* 颜色变量 - 主色系 */
  --color-primary: #c03027;
  --color-primary-dark: #a02820;
  --color-primary-light: #d84339;
  
  /* 颜色变量 - 中性色系 */
  --color-dark: #222222;
  --color-dark-medium: #333333;
  --color-dark-light: #555555;
  --color-gray: #777777;
  --color-gray-light: #999999;
  --color-gray-lighter: #cccccc;
  --color-gray-lightest: #f5f5f5;
  --color-white: #ffffff;
  
  /* 颜色变量 - 功能色 */
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-danger: #dc3545;
  --color-info: #17a2b8;
  
  /* 颜色变量 - 背景色 */
  --bg-primary: var(--color-white);
  --bg-secondary: var(--color-gray-lightest);
  --bg-dark: var(--color-dark);
  
  /* 排版变量 */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-heading: var(--font-family-base);
  --font-family-body: var(--font-family-base);
  
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-md: 18px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;
  --font-size-xxl: 32px;
  --font-size-xxxl: 40px;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.2;
  --line-height-base: 1.5;
  --line-height-relaxed: 1.8;
  
  /* 间距变量 */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 20px;
  --space-xl: 24px;
  --space-xxl: 32px;
  --space-xxxl: 40px;
  
  /* 断点变量 - 桌面优先 */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  
  /* 容器变量 */
  --container-max-width: 1200px;
  --container-padding: var(--space-md);
  
  /* 层级变量 */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  
  /* 效果变量 */
  --border-radius-sm: 4px;
  --border-radius-md: 6px;
  --border-radius-lg: 8px;
  --border-radius-circle: 50%;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.12);
  
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.2s ease-in-out;
}


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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-base);
  color: var(--color-dark-medium);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


ul,
ol {
  list-style: none;
}


a {
  text-decoration: none;
  color: inherit;
  background-color: transparent;
}


h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-dark);
}

p {
  margin-bottom: var(--space-md);
}


img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}


button,
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible),
input:focus:not(:focus-visible) {
  outline: none;
}


table {
  border-collapse: collapse;
  border-spacing: 0;
}


blockquote,
figure {
  margin: 0;
}


time {
  font-style: normal;
}


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


header,
footer,
nav,
main,
section,
article,
aside {
  display: block;
}


.section {
  padding-top: var(--space-xxl);
  padding-bottom: var(--space-xxl);
}


h1 { font-size: var(--font-size-xxxl); }
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-md); }
h6 { font-size: var(--font-size-base); }


.text-primary { color: var(--color-primary); }
.text-dark { color: var(--color-dark); }
.text-gray { color: var(--color-gray); }
.text-white { color: var(--color-white); }




.u-show { display: block; }
.u-show-inline { display: inline; }
.u-show-inline-block { display: inline-block; }
.u-hide { display: none; }


@media (max-width: 991px) {
  .u-hide-mobile { display: none !important; }
}


@media (max-width: 991px) {
  .u-show-mobile { display: block !important; }
  .u-show-mobile-inline { display: inline !important; }
  .u-show-mobile-inline-block { display: inline-block !important; }
}


@media (min-width: 768px) and (max-width: 991px) {
  .u-show-tablet { display: block !important; }
  .u-hide-tablet { display: none !important; }
}


@media (min-width: 992px) {
  .u-show-desktop { display: block !important; }
  .u-hide-desktop { display: none !important; }
}


.u-text-left { text-align: left; }
.u-text-center { text-align: center; }
.u-text-right { text-align: right; }


@media (max-width: 767px) {
  .u-text-center-mobile { text-align: center; }
  .u-text-left-mobile { text-align: left; }
}


.u-mt-xs { margin-top: var(--space-xs); }
.u-mt-sm { margin-top: var(--space-sm); }
.u-mt-md { margin-top: var(--space-md); }
.u-mt-lg { margin-top: var(--space-lg); }
.u-mt-xl { margin-top: var(--space-xl); }

.u-mb-xs { margin-bottom: var(--space-xs); }
.u-mb-sm { margin-bottom: var(--space-sm); }
.u-mb-md { margin-bottom: var(--space-md); }
.u-mb-lg { margin-bottom: var(--space-lg); }
.u-mb-xl { margin-bottom: var(--space-xl); }

.u-pt-xs { padding-top: var(--space-xs); }
.u-pt-sm { padding-top: var(--space-sm); }
.u-pt-md { padding-top: var(--space-md); }
.u-pt-lg { padding-top: var(--space-lg); }
.u-pt-xl { padding-top: var(--space-xl); }

.u-pb-xs { padding-bottom: var(--space-xs); }
.u-pb-sm { padding-bottom: var(--space-sm); }
.u-pb-md { padding-bottom: var(--space-md); }
.u-pb-lg { padding-bottom: var(--space-lg); }
.u-pb-xl { padding-bottom: var(--space-xl); }


.u-clearfix::after {
  content: "";
  display: table;
  clear: both;
}


.u-flex { display: flex; }
.u-flex-wrap { flex-wrap: wrap; }
.u-flex-nowrap { flex-wrap: nowrap; }
.u-flex-center { justify-content: center; }
.u-flex-between { justify-content: space-between; }
.u-flex-start { justify-content: flex-start; }
.u-flex-end { justify-content: flex-end; }
.u-align-center { align-items: center; }
.u-align-start { align-items: flex-start; }
.u-align-end { align-items: flex-end; }


@media (max-width: 767px) {
  .u-flex-mobile-column { flex-direction: column; }
  .u-flex-mobile-wrap { flex-wrap: wrap; }
}


.u-width-full { width: 100%; }
.u-width-auto { width: auto; }


img[data-src] {
  opacity: 0;
  transition: opacity var(--transition-base);
}

img.loaded,
img[data-src].loaded {
  opacity: 1;
}


img {
  transition: all var(--transition-base);
  will-change: transform;
}

img:hover {
  transform: scale(1.02);
  filter: brightness(1.1) contrast(1.05);
  border-radius: var(--border-radius-sm);
}


.card img:hover,
.article img:hover {
  transform: scale(1.01);
}


.header img:hover,
.navbar img:hover {
  transform: scale(1.01);
}


.carousel img:hover {
  transform: scale(1.01);
}

.line-clamp-1,
.line-clamp-1[class] {
  display: -webkit-box !important;
  -webkit-line-clamp: 1 !important;
  -webkit-box-orient: vertical !important;
  overflow: hidden !important;
  min-width: 0;
  word-break: break-word;
}

.line-clamp-2 {
  display: -webkit-box !important;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-width: 0;
  word-break: break-word;
}

.line-clamp-3 {
  display: -webkit-box !important;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-width: 0;
  word-break: break-word;
}

.line-clamp-4 {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}