/* ============================================================
   微微健康网 — Design System v1.0
   Design: Premium Chinese Medicine & Health Science
   Breakpoints: 1920px (xl) / 1440px (lg) / 1280px (md) / 768px (sm) / 480px (xs)
   ============================================================ */

/* ----------------------------------------------------------
   1. CSS Variables (Design Tokens)
   ---------------------------------------------------------- */
:root {

  /* -- Colors -- */
  /* Primary Colors */
  --color-primary: #1a1a1a;
  --color-primary-light: #c9ae7e;
  --color-primary-dark: #c9ae7e;
  --color-primary-pale: #E8F5E8;
  --color-accent: #5CB85C;
  
  /* Text Colors */
  --color-text-primary: #2C2C2C;
  --color-text-secondary: #666666;
  --color-text-muted: #999999;
  --color-text-on-primary: #FFFFFF;
  --color-text-nav: #efebe2;
  
  /* Background Colors */
  --color-bg: #f4f1ec;
  --color-bg-white: #FFFFFF;
  --color-bg-card: #FFFFFF;
  --color-bg-footer: #2C2C2C;
  --color-bg-nav: #faf7f0;
  
  /* Border Colors */
  --color-border: #E8E6E1;
  --color-border-light: #F0EFEA;
  --color-border-nav: #ececec;
  --color-divider: #EEECE7;
  
  /* Tag Colors */
  --color-tag-bg: #F0F7F0;
  --color-tag-text: #4A8B4A;
  --color-tag-border: #c9b896;
  --color-tag-border-hover: #a69478;
  
  /* Shadow Colors */
  --color-shadow: rgba(0, 0, 0, 0.06);
  --color-shadow-hover: rgba(0, 0, 0, 0.10);
  
  /* -- Typography -- */
  --font-family-base: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", 
                      "Noto Sans SC", -apple-system, BlinkMacSystemFont, 
                      "Segoe UI", system-ui, sans-serif;
  --font-family-heading: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                          "Noto Serif SC", "STSong", serif;
  --font-family-mono: "SF Mono", "Fira Code", "Consolas", monospace;
  
  --font-size-hero: 2rem;       /* 32px */
  --font-size-h1: 1.75rem;      /* 28px */
  --font-size-h2: 1.5rem;       /* 24px */
  --font-size-h3: 1.25rem;      /* 20px */
  --font-size-h4: 1.125rem;     /* 18px */
  --font-size-body: 1rem;       /* 16px */
  --font-size-small: 0.875rem;  /* 14px */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-tag: 1.875rem;    /* 30px */
  
  --line-height-heading: 1.4;
  --line-height-body: 1.8;
  --line-height-tight: 1.25;
  
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* -- Spacing -- */
  --space-page-desktop: 80px;
  --space-page-tablet: 40px;
  --space-page-mobile: 16px;
  --space-section: 60px;
  --space-card-gap: 24px;
  --space-card-gap-mobile: 16px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  
  /* -- Layout -- */
  --max-width: 1200px;
  --nav-height: 80px;
  
  /* -- Border Radius -- */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  
  /* -- Shadows -- */
  --shadow-sm: 0 1px 3px var(--color-shadow);
  --shadow-md: 0 4px 12px var(--color-shadow);
  --shadow-lg: 0 8px 24px var(--color-shadow);
  --shadow-hover: 0 8px 30px var(--color-shadow-hover);
  
  /* -- Transitions -- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-smooth: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  
  /* -- Z-Index -- */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
}

/* ----------------------------------------------------------
   2. Reset & Base
   ---------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
}

input, textarea {
  font: inherit;
  color: inherit;
  border: none;
  outline: none;
}

::selection {
  background-color: var(--color-primary-pale);
  color: var(--color-primary-dark);
}

/* ----------------------------------------------------------
   3. Typography Utilities
   ---------------------------------------------------------- */
.hero-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
}

.h1, .section-heading {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
}

.h2 {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-heading);
}

.h3 {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-heading);
}

.h4 {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-heading);
}

.text-body {
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-secondary);
}

.text-small {
  font-size: var(--font-size-small);
  line-height: 1.6;
  color: var(--color-text-muted);
}

.text-xs {
  font-size: var(--font-size-xs);
  line-height: 1.5;
  color: var(--color-text-muted);
}

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

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

/* ----------------------------------------------------------
   4. Layout Utilities
   ---------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-page-desktop);
}

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

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.section-header__title {
  display: flex;
  align-items: center;
  gap: var(--space-md);
   background-image: url("https://img.vivijk.com/images/leaf.png");
  /* 核心：水平居中、垂直靠顶部 */
  background-position: left top;
  /* 禁止重复平铺 */
  background-repeat: no-repeat;
  padding-left: 36px;
}


.section-header__title h2 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-semibold);
}

.section-header__title span {
  color: var(--color-primary-light);
  padding-top: 20px;
}
.section-header__tag {
  display: flex;
  align-items: center;
  gap: 16px;
}
.section-header__tag-item {
  font-size: var(--font-size-tag, 1.875rem);
  width: 80px;
  height: 40px;
  padding-left: 10px;
  overflow: hidden;
  color: var(--color-primary);
  text-align: center;
  border: 1.4px solid var(--color-tag-border);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.section-header__tag-item:hover {
  background-color: rgba(201, 184, 150, 0.1);
  border-color: var(--color-tag-border-hover);
}

.section-header__more {
  font-size: 20px;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.section-header__more:hover {
  color: var(--color-primary-light);
}

.section-header__more .arrow {
  transition: transform var(--transition-fast);
  color: var(--color-primary-light);
}

.section-header__more:hover .arrow {
  transform: translateX(3px);
}

/* ----------------------------------------------------------
   5. Grid Systems
   ---------------------------------------------------------- */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-card-gap);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-card-gap);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-card-gap);
}

.grid-main {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-xl);
}

/* ----------------------------------------------------------
   6. Navigation
   ---------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-sticky);
  transition: background-color var(--transition-smooth),
              box-shadow var(--transition-smooth),
              backdrop-filter var(--transition-smooth);
  background-color: var(--color-bg-nav);
  border-bottom: 1px solid var(--color-border-nav); 
}

.nav--scrolled {
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow: 0 1px 0 var(--color-border-light),
              0 4px 20px rgba(0, 0, 0, 0.04);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-page-desktop);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-dark);
  flex-shrink: 0;
}

.nav--scrolled .nav__logo {
  color: var(--color-primary-dark);
}

.nav__logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  font-weight: var(--font-weight-bold);
}

/* Nav Links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  /* font-size: var(--font-size-body); */
  font-size: 20px;
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  position: relative;
  top:0;
  padding: var(--space-xs);
  transition: color var(--transition-fast);
  border-bottom: 2px solid transparent;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: width var(--transition-smooth);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary-dark);
  border-color:  var(--color-accent);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

/* Search Box */
.nav__search {
  display: flex;
  align-items: center;
  width: 326px;
  height: 44px;
  background-color: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-full);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: box-shadow var(--transition-fast);
}

.nav__search:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.nav__search-input {
  flex: 1;
  height: 100%;
  padding: 0 var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-nav);
  background: transparent;
  border: none;
  outline: none;
}

.nav__search-input::placeholder {
  color: rgba(239, 235, 226, 0.6);
}

.nav__search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 100%;
  background-color: rgba(239, 235, 226, 0.15);
  color: var(--color-text-nav);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.nav__search-btn:hover {
  background-color: rgba(239, 235, 226, 0.25);
}

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: calc(var(--z-sticky) + 1);
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-smooth),
              opacity var(--transition-fast);
}

.nav--mobile-open .nav__toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav--mobile-open .nav__toggle span:nth-child(2) {
  opacity: 0;
}

.nav--mobile-open .nav__toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.nav__mobile-menu {
  display: none;
}

.section--era-health {
  background: var(--color-bg);
}

/* ----------------------------------------------------------
   7. Hero Split Layout (左图右文)
   ---------------------------------------------------------- */
.hero-split {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  background: var(--color-bg);  
}

.hero-split__inner {
  display: grid;
  grid-template-columns: 3fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  background: #fff;
  border-radius: var(--radius-md);
  padding:20px;
  border: 1px solid var(--color-border-light);
  position: relative;
}

/* Left Carousel */
.hero-split__carousel {
  aspect-ratio: 5 / 3;
  background: #fff;
}

.hero-split__slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero-split__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 500ms ease;
  pointer-events: none;
}

.hero-split__slide--active {
  opacity: 1;
  pointer-events: auto;
}

.hero-split__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.hero-split__dots {
  position: absolute;
  bottom: 5%;
  right: 5%;
  transform: translateX(-50%);
  display: flex;
  gap: 9px;
  z-index: 10;
}

.hero-split__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #efebe2;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  padding: 0;
}

.hero-split__dot--active {
  background: #9cb990;
  transform: scale(1.3);
}

/* Right Content */
.hero-split__content {
  padding: var(--space-xl) var(--space-xl) var(--space-xl) 0;
}

.hero-split__tag {
  display: inline-block;
  background: var(--color-primary-pale);
  color: var(--color-primary-dark);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.hero-split__title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.hero-split__desc {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.hero-split__arrows {
  display: flex;
  gap: var(--space-sm);
}

.hero-split__arrow {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.hero-split__arrow:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

/* ----------------------------------------------------------
   8. Cards
   ---------------------------------------------------------- */
.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-bounce),
              box-shadow var(--transition-smooth);
  cursor: pointer;
  border: 1px solid var(--color-border-light);
}

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

.card__image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--color-border-light);
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

.card:hover .card__image img {
  transform: scale(1.05);
}

.card__image-tag {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.card__body {
  padding: var(--space-md);
}

.card__title {
  /*  font-size: var(--font-size-h4); */
  font-size: var(--font-size-medium);
  /*font-weight: var(--font-weight-semibold);*/
  font-weight:200;
  color: var(--color-text-primary);
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-fast);
}

.card:hover .card__title {
  color: var(--color-primary-dark);
}

.card__desc {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--color-primary-light);
}

.card__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Card Horizontal (for sidebars) */
.card-horizontal {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  border: 1px solid var(--color-border-light);
}

.card-horizontal:hover {
  background-color: var(--color-primary-pale);
}

.card-horizontal__image {
  width: 120px;
  height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background-color: var(--color-border-light);
}

.card-horizontal__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-horizontal__body {
  flex: 1;
  min-width: 0;
}

.card-horizontal__title {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-xs);
}

.card-horizontal__date {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Card Large (时代健康 featured) */
.card-featured {
  position: relative;
  grid-column: span 2;
  grid-row: span 2;
}

.card-featured .card__image {
  aspect-ratio: 16 / 9;
}

/*
.card-featured .card__title {
  font-size: var(--font-size-h3);
}
*/

/* Card Simple (image + title only, no desc) */
.card--simple .card__body {
  padding: var(--space-sm) var(--space-md);
}

.card--simple .card__title {

  font-weight: var(--font-weight-medium);
  -webkit-line-clamp: 2;
}

/* Card stats overlay on image */
.card__image-stats {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 8px 10px;
  background: linear-gradient(transparent, rgba(0,0,0,0.5));
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.9);
}

.card__image-stat {
  display: flex;
  align-items: center;
  gap: 3px;
}

/* ============================================================
   9. Homepage Specific Styles
   ============================================================ */

/* Featured Grid (时代健康) */
.featured-grid {
  display: grid;
  grid-template-columns: 656px 24px 240px 24px 240px;
  grid-template-rows: auto auto;
  gap: 0;
}

.featured-grid .card:first-child {
  grid-row: span 2;
  grid-column: 1;
}

.featured-grid .card:first-child .card__image {
  width: 656px;
  height: 442px;
  aspect-ratio: auto;
}

.featured-grid .card:nth-child(2) {
  grid-column: 3;
  height: 280px;
  margin-bottom: var(--space-md);
  display: flex;
  flex-direction: column;
}

.featured-grid .card:nth-child(3) {
  grid-column: 5;
  height: 280px;
  margin-bottom: var(--space-md);
  display: flex;
  flex-direction: column;
}

.featured-grid .card:nth-child(2) .card__image,
.featured-grid .card:nth-child(3) .card__image {
  flex: 1;
  aspect-ratio: auto;
  min-height: 0;
}

.featured-grid .card:nth-child(2) .card__body,
.featured-grid .card:nth-child(3) .card__body {
  padding: var(--space-sm) var(--space-md);
  flex-shrink: 0;
}

.featured-grid .card:nth-child(4) {
  grid-column: 3 / span 3;
  grid-row: 2;
}

/* Text List within cards */
.card__body--text-list {
  padding: var(--space-sm) var(--space-md);
}

.text-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-border-light);
  transition: all var(--transition-fast);
}

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

.text-list-item:hover .text-list-item__text {
  color: var(--color-primary-dark);
}

.text-list-item__dot {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.card__body--text-list-row {
  flex-wrap: wrap;
  gap: var(--space-md);
  display: block;
  width: 100%;
  padding: 20px;

}

.text-list-item {
  display: block;
  width: 100%;
  padding: 8px 0;
  align-items: center;
  padding: 0;
  border-bottom: none;
}

.text-list-item__text {
  font-size: 20px;
  color: var(--color-text-secondary);
  line-height: 2.5;
  transition: color var(--transition-fast);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.sidebar__block {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border-light);
}

.sidebar__block-title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.sidebar__block-title::before {
  content: '';
  width: 3px;
  height: 18px;
  background: var(--color-primary);
  border-radius: 2px;
}

.sidebar__list-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--transition-fast);
}

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

.sidebar__list-item:hover .sidebar__list-title {
  color: var(--color-primary-dark);
}

.sidebar__list-rank {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  min-width: 28px;
  text-align: center;
  line-height: 1;
}

.sidebar__list-item:nth-child(-n+3) .sidebar__list-rank {
  color: var(--color-primary);
}

.sidebar__list-content {
  flex: 1;
  min-width: 0;
}

.sidebar__list-title {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-fast);
}

.sidebar__list-views {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* Tags Cloud */
.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  font-size: var(--font-size-small);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: var(--color-primary);
  color: var(--color-text-on-primary);
}

/* Section Sub-Tabs (健康新义 生活观/饮食观/运动观/审美观) */
.section-subtabs {
  display: flex;
  gap: var(--space-sm);
}

.section-subtab {
  padding: 5px 16px;
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  cursor: pointer;
  background: transparent;
}

.section-subtab:hover {
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

.section-subtab--active {
  color: var(--color-primary-dark);
  background: var(--color-primary-pale);
  font-weight: var(--font-weight-medium);
}

/* CTA Knowledge Banner */
.cta-banner {
  background: var(--color-primary-pale);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  background: var(--color-primary);
  opacity: 0.04;
  border-radius: 50%;
}

.cta-banner__title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-xl);
  position: relative;
}

.cta-banner__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  text-align: left;
  position: relative;
}

/* 4-col variant for article page */
.cta-banner__cols--4 {
  grid-template-columns: repeat(4, 1fr);
}

.cta-banner__col {
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.cta-banner__col-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.cta-banner__col-title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.cta-banner__col-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================================
   10. Category Page (二级分类页)
   ============================================================ */

/* Category Intro (顶部图文区) */
.category-intro {
  margin-bottom: var(--space-xl);
}

.category-intro__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
}

.category-intro__image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.category-intro__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.category-intro__content {
  padding: var(--space-xl) var(--space-xl) var(--space-xl) 0;
}

.category-intro__title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.category-intro__desc {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.category-intro__stats {
  display: flex;
  gap: var(--space-lg);
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

/* Category Tabs */
.category-tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.category-tab {
  padding: 8px 30px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-medium);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.category-tab:hover {
  border-color: var(--color-primary-light);
  color: var(--color-text-on-primary);
  background: #77a06a;
}

.category-tab--active {
  background: #77a06a;
  color: var(--color-text-on-primary);
  border-color: #77a06a;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
}

.pagination__btn {
  min-width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-fast);
}

.pagination__btn:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
}

.pagination__btn--active {
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  border-color: var(--color-primary);
}

.pagination__btn--disabled {
  opacity: 0.4;
  pointer-events: none;
}

.pagination__ellipsis {
  min-width: 38px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

/* ============================================================
   11. Article Detail Page (内容页)
   ============================================================ */

.article-page {
  padding-top: calc(var(--nav-height) + var(--space-xl));
}

.article-main {
  max-width: 800px;
  margin: 0 auto;
}

/* Article Header */
.article-header {
  margin-bottom: var(--space-xl);
}

.article-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.article-header__category {
  display: inline-block;
  padding: 4px 14px;
  background: var(--color-primary-pale);
  color: var(--color-primary-dark);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
}

.article-header__title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.article-header__meta {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.article-header__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Author Info */
.article-header__author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
}

.article-author__avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.article-author__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-author__info {
  flex: 1;
  min-width: 0;
}

.article-author__name {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.article-author__bio {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.article-author__follow {
  flex-shrink: 0;
  padding: 6px 18px;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background: var(--color-primary-pale);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.article-author__follow:hover {
  background: var(--color-primary);
  color: var(--color-text-on-primary);
}

/* Share Buttons */
.article-header__share {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

.article-header__share-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-right: var(--space-xs);
}

.article-share-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.article-share-btn--wechat { background: #07C160; color: #fff; }
.article-share-btn--weibo { background: #E6162D; color: #fff; }
.article-share-btn--qq { background: #12B7F5; color: #fff; }
.article-share-btn--link { background: var(--color-bg); color: var(--color-text-secondary); border: 1px solid var(--color-border); }

.article-share-btn:hover {
  transform: scale(1.1);
  opacity: 0.9;
}

/* Article Content */
.article-content {
  font-size: var(--font-size-h4);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
}

.article-content p {
  margin-bottom: 1.5em;
}

.article-content h2 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  margin: 2em 0 0.8em;
  line-height: var(--line-height-heading);
}

.article-content h3 {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
  margin: 1.5em 0 0.6em;
  line-height: var(--line-height-heading);
}

.article-content img {
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
  max-width: 100%;
}

.article-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  background: var(--color-primary-pale);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.article-content ul,
.article-content ol {
  padding-left: 1.5em;
  margin-bottom: 1.5em;
}

.article-content ul li {
  list-style: disc;
  margin-bottom: 0.5em;
  line-height: 1.8;
}

.article-content ol li {
  list-style: decimal;
  margin-bottom: 0.5em;
  line-height: 1.8;
}

/* Article Interaction */
.article-interaction {
  margin-top: var(--space-2xl);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.article-interaction__title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.article-interaction__actions {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.article-like-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.article-like-btn:hover {
  border-color: #E6162D;
  color: #E6162D;
}

/* Comments Placeholder */
.comments-placeholder {
  min-height: 160px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  text-align: center;
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border);
}

/* Prev/Next Navigation */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
}

.article-nav__item {
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.article-nav__item:hover {
  border-color: var(--color-primary-light);
  background: var(--color-primary-pale);
}

.article-nav__item--next {
  text-align: right;
}

.article-nav__label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.article-nav__title {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-nav__item:hover .article-nav__title {
  color: var(--color-primary-dark);
}

/* Related Articles Section */
.related-articles-section {
  padding-top: var(--space-2xl);
}

/* ============================================================
   12. Search Page
   ============================================================ */

.search-page {
  padding-top: calc(var(--nav-height) + var(--space-xl));
}

.search-header {
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: var(--space-xl);
}

/* Search Box */
.search-box {
  margin: 0;
}

.search-box__input-wrapper {
  display: flex;
  align-items: center;
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 0 var(--space-lg);
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
}

.search-box__input-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-pale);
}

.search-box__icon {
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.search-box__input {
  flex: 1;
  padding: 14px var(--space-md);
  font-size: var(--font-size-body);
  background: transparent;
}

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

/* Search Layout (left results + right sidebar) */
.search-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-xl);
}

.search-results-main {
  min-width: 0;
}

/* Filter Tabs */
.search-filter-tabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.search-filter-tabs__main {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border-light);
}

.search-filter-tab {
  padding: 8px 20px;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition-fast);
}

.search-filter-tab:hover {
  color: var(--color-primary);
}

.search-filter-tab--active {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
}

.search-filter-tabs__sub {
  display: flex;
  gap: var(--space-sm);
}

.search-subtab {
  padding: 4px 14px;
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.search-subtab:hover {
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

.search-subtab--active {
  color: var(--color-primary-dark);
  background: var(--color-primary-pale);
  font-weight: var(--font-weight-medium);
}

/* Search Result Card (thumb left + content right) */
.search-results-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.search-result-card {
  border-bottom: 1px solid var(--color-border-light);
}

.search-result-card:last-child {
  border-bottom: none;
}

.search-result-card__link {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  transition: background-color var(--transition-fast);
}

.search-result-card__link:hover {
  background-color: rgba(0,0,0,0.01);
}

.search-result-card__thumb {
  width: 200px;
  height: 125px;
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-border-light);
}

.search-result-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.search-result-card__content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.search-result-card__tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  color: var(--color-primary-dark);
  background: var(--color-primary-pale);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  width: fit-content;
}

.search-result-card__title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.search-result-card__excerpt {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
  margin-bottom: var(--space-sm);
}

.search-result-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.search-result-card__author {
  display: flex;
  align-items: center;
  gap: 4px;
}

.search-result-card__avatar {
  width: 18px;
  height: 18px;
  border-radius: 50%;
}

/* Search Sidebar */
.search-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.search-sidebar__block {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border-light);
}

.search-sidebar__title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
}

/* Hot Tags */
.search-hot-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.search-hot-tag {
  padding: 6px 14px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.search-hot-tag:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

/* Recommend List */
.search-recommend-list {
  display: flex;
  flex-direction: column;
}

.search-recommend-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--transition-fast);
}

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

.search-recommend-item__rank {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  min-width: 20px;
  text-align: center;
  line-height: 1;
  flex-shrink: 0;
}

.search-recommend-item:nth-child(-n+3) .search-recommend-item__rank {
  color: var(--color-primary);
}

.search-recommend-item__thumb {
  width: 60px;
  height: 45px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-border-light);
}

.search-recommend-item__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.search-recommend-item__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.search-recommend-item:hover .search-recommend-item__title {
  color: var(--color-primary-dark);
}

/* PageFind UI overrides */
.pagefind-ui {
  width: 100%;
}

.pagefind-ui__search-input {
  width: 100%;
  padding: 14px var(--space-lg) !important;
  font-size: var(--font-size-body) !important;
  border: 2px solid var(--color-border) !important;
  border-radius: var(--radius-xl) !important;
  background: var(--color-bg-card) !important;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast) !important;
}

.pagefind-ui__search-input:focus {
  border-color: var(--color-primary) !important;
  box-shadow: 0 0 0 4px var(--color-primary-pale) !important;
}

/* ============================================================
   13. Footer
   ============================================================ */

.footer {
  background: var(--color-bg-footer);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: var(--space-3xl);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-page-desktop);
}

.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__brand-name {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-on-primary);
  margin-bottom: var(--space-md);
}

.footer__brand-desc {
  font-size: var(--font-size-small);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
}

.footer__col-title {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-on-primary);
  margin-bottom: var(--space-lg);
}

.footer__col-link {
  display: block;
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, 0.6);
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.footer__col-link:hover {
  color: var(--color-primary-light);
}

.footer__qrcode {
  width: 100px;
  height: 100px;
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: var(--space-sm);
}

.footer__qrcode img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.footer__qrcode-text {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

.footer__bottom {
  padding-top: var(--space-lg);
  text-align: center;
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.4);
}

/* ----------------------------------------------------------
   14. Utility Classes
   ---------------------------------------------------------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }
.mt-5 { margin-top: var(--space-2xl); }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ----------------------------------------------------------
   15. Responsive — Desktop (≤ 1280px)
   ---------------------------------------------------------- */
@media (max-width: 1280px) {
  :root {
    --font-size-hero: 1.75rem;      /* 28px */
    --font-size-h1: 1.5rem;         /* 24px */
    --font-size-h2: 1.375rem;       /* 22px */
    --font-size-h3: 1.125rem;       /* 18px */
    --font-size-h4: 1rem;           /* 16px */
    --font-size-tag: 1.5rem;         /* 24px */
    --max-width: 1100px;
  }
  
  .container {
    padding: 0 var(--space-page-tablet);
  }
  
  .nav__inner {
    padding: 0 var(--space-page-tablet);
  }
  
  .hero-split__inner {
    grid-template-columns: 1.1fr 1fr;
    gap: var(--space-xl);
  }
  
  .hero-split__content {
    padding: var(--space-xl) var(--space-xl) var(--space-xl) 0;
  }
  
  .hero-split__carousel {
    aspect-ratio: 16 / 9;
  }
  
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid-main {
    grid-template-columns: 1fr 260px;
  }
  
  .featured-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-card-gap);
  }
  
  .featured-grid .card:first-child {
    grid-column: span 2;
    grid-row: auto;
  }
  
  .featured-grid .card:first-child .card__image {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 10;
  }
  
  .featured-grid .card:nth-child(2),
  .featured-grid .card:nth-child(3) {
    grid-column: auto;
    grid-row: auto;
    height: auto;
    margin-bottom: 0;
  }
  
  .featured-grid .card:nth-child(2) .card__image,
  .featured-grid .card:nth-child(3) .card__image {
    aspect-ratio: 16 / 9;
  }
  
  .featured-grid .card:nth-child(4) {
    grid-column: span 2;
    grid-row: auto;
  }
  
  .footer__top {
    grid-template-columns: 1fr 1fr;
  }
  
  .cta-banner__cols,
  .cta-banner__cols--4 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
  
  .cta-banner__col {
    padding: var(--space-md);
  }
}

/* ----------------------------------------------------------
   16. Responsive — Tablet (≤ 768px)
   ---------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --font-size-hero: 1.5rem;        /* 24px */
    --font-size-h1: 1.375rem;        /* 22px */
    --font-size-h2: 1.125rem;        /* 18px */
    --font-size-h3: 1rem;            /* 16px */
    --font-size-h4: 0.9375rem;       /* 15px */
    --font-size-body: 0.9375rem;      /* 15px */
    --font-size-tag: 1.25rem;         /* 20px */
    --max-width: 700px;
    --space-section: 48px;
    --space-card-gap: 16px;
  }
  
  .container {
    padding: 0 var(--space-page-tablet);
  }
  
  .nav__inner {
    padding: 0 var(--space-page-tablet);
  }
  
  .nav__toggle {
    display: flex;
  }
  
  .nav__links {
    display: none;
  }
  
  .nav__mobile-menu {
    display: block;
    position: fixed;
    top: var(--nav-height);
    left: 100%;
    width: 100%;
    height: calc(100vh - var(--nav-height));
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--space-xl) var(--space-page-mobile);
    z-index: var(--z-overlay);
    transition: left var(--transition-smooth);
    overflow-y: auto;
  }
  
  .nav--mobile-open .nav__mobile-menu {
    left: 0;
  }
  
  .nav__mobile-link {
    display: block;
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-medium);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-primary);
  }
  
  .nav__mobile-link:hover,
  .nav__mobile-link--active {
    color: var(--color-accent);
  }
  
  .hero-split {
    padding-top: calc(var(--nav-height) + var(--space-lg));
    padding-bottom: var(--space-lg);
    min-height: auto;
  }
  
  .hero-split__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .hero-split__content {
    padding: 0 var(--space-lg) var(--space-lg);
  }
  
  .hero-split__desc {
    display: none;
  }
  
  .hero-split__title {
    font-size: var(--font-size-h3);
  }
  
  .hero-split__carousel {
    aspect-ratio: 16 / 9;
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .grid-main {
    grid-template-columns: 1fr;
  }
  
  .featured-grid {
    grid-template-columns: 1fr;
    gap: var(--space-card-gap);
  }
  
  .featured-grid .card:first-child {
    grid-column: span 1;
    grid-row: auto;
  }
  
  .featured-grid .card:first-child .card__image {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 10;
  }
  
  .featured-grid .card:nth-child(2),
  .featured-grid .card:nth-child(3) {
    grid-column: auto;
    grid-row: auto;
    height: auto;
    margin-bottom: 0;
  }
  
  .featured-grid .card:nth-child(2) .card__image,
  .featured-grid .card:nth-child(3) .card__image {
    aspect-ratio: 16 / 9;
  }
  
  .featured-grid .card:nth-child(4) {
    grid-column: span 1;
    grid-row: auto;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  
  .category-intro__inner {
    grid-template-columns: 1fr;
    gap: 0;
  }
  
  .category-intro__content {
    padding: var(--space-lg);
  }
  
  .search-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .search-filter-tabs {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .search-result-card__thumb {
    width: 150px;
    height: 100px;
  }

  .section-header__title {
    flex-wrap: wrap;
  }
  
  .section-subtabs {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }
  
  .section-subtab {
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  .card-horizontal__image {
    width: 100px;
    height: 66px;
  }
  
  .article-header__title {
    font-size: var(--font-size-h2);
  }
  
  .article-main {
    max-width: 100%;
  }
  
  .article-nav {
    grid-template-columns: 1fr;
  }
  
  .category-tabs {
    gap: 6px;
  }
  
  .category-tab {
    padding: 6px 14px;
    font-size: var(--font-size-xs);
  }
  
  .search-box__input-wrapper {
    padding: 0 var(--space-md);
  }
  
  .search-box__input {
    padding: 12px var(--space-sm);
  }
  
  .search-filters {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: var(--space-sm);
  }
  
  .search-filter {
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  .footer__top {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
  
  .footer__inner {
    padding: 0 var(--space-page-tablet);
  }
  
  .pagination {
    gap: 2px;
  }
  
  .pagination__btn {
    min-width: 32px;
    height: 32px;
    font-size: var(--font-size-xs);
  }
  
  .search-page {
    padding-top: calc(var(--nav-height) + var(--space-md));
  }
  
  .search-filter-tabs__sub {
    overflow-x: auto;
    padding-bottom: 4px;
    width: 100%;
  }
  
  .search-subtab {
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  .search-result-card__link {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .search-result-card__thumb {
    width: 100%;
    height: 180px;
  }
  
  .cta-banner {
    padding: var(--space-xl) var(--space-md);
  }
  
  .cta-banner__cols,
  .cta-banner__cols--4 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
  
  .cta-banner__title {
    font-size: var(--font-size-h3);
  }
}

/* ----------------------------------------------------------
   17. Responsive — Mobile (≤ 480px)
   ---------------------------------------------------------- */
@media (max-width: 480px) {
  :root {
    --font-size-hero: 1.25rem;       /* 20px */
    --font-size-h1: 1.25rem;         /* 20px */
    --font-size-h2: 1.0625rem;       /* 17px */
    --font-size-h3: 0.9375rem;       /* 15px */
    --font-size-h4: 0.875rem;        /* 14px */
    --font-size-body: 0.875rem;       /* 14px */
    --font-size-small: 0.8125rem;     /* 13px */
    --font-size-xs: 0.75rem;          /* 12px */
    --font-size-tag: 1rem;            /* 16px */
    --max-width: 440px;
    --space-section: 40px;
    --space-card-gap: 12px;
    --space-page-tablet: 16px;
  }
  
  .container {
    padding: 0 var(--space-page-mobile);
  }
  
  .nav__inner {
    padding: 0 var(--space-page-mobile);
  }
  
  .hero-split {
    padding-top: calc(var(--nav-height) + var(--space-md));
    padding-bottom: var(--space-md);
    min-height: auto;
    background-image: none;
  }
  
  .hero-split__content {
    padding: 0 var(--space-md) var(--space-md);
  }
  
  .hero-split__title {
    font-size: var(--font-size-h2);
  }
  
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .featured-grid {
    grid-template-columns: 1fr;
  }
  
  .featured-grid .card:first-child {
    grid-column: auto;
    grid-row: auto;
  }
  
  .hero-split__dots {
    right: 50%;
    transform: translateX(50%);
  }
  
  .search-result-card__thumb {
    width: 120px;
    height: 80px;
  }
  
  .footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .footer__inner {
    padding: 0 var(--space-page-mobile);
  }
  
  .cta-banner__cols,
  .cta-banner__cols--4 {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .article-header__meta {
    flex-wrap: wrap;
    gap: var(--space-md);
  }
  
  .article-header__author {
    flex-direction: column;
    text-align: center;
  }
  
  .article-author__follow {
    width: 100%;
  }
}

/* ----------------------------------------------------------
   18. Large Desktop (≥ 1440px)
   ---------------------------------------------------------- */
@media (min-width: 1440px) {
  :root {
    --max-width: 1280px;
    --font-size-hero: 2.25rem;      /* 36px */
    --font-size-h1: 2rem;           /* 32px */
    --font-size-h2: 2.3rem;         /* 37px */
    --font-size-h3: 1.375rem;       /* 22px */
    --font-size-h4: 1.125rem;       /* 18px */
    --space-section: 72px;
    --space-page-desktop: 80px;
  }

  .hero-split__carousel {
    aspect-ratio: 16 / 10;
  }

  .article-main {
    max-width: 860px;
  }
  .hero-split__slides {
    left:-50px;
  }

  .grid-main {
    grid-template-columns: 1fr 320px;
  }

  .nav__inner {
    padding: 0 var(--space-page-desktop);
  }

  .container {
    padding: 0 var(--space-page-desktop);
  }

  .footer__inner {
    padding: 0 var(--space-page-desktop);
  }

  .footer__top {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

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

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

/* ----------------------------------------------------------
   19. Extra Large Desktop (≥ 1920px / 1080p)
   ---------------------------------------------------------- */
@media (min-width: 1920px) {
  :root {
    --max-width: 1400px;
    --font-size-hero: 2.5rem;       /* 40px */
    --font-size-h1: 2.25rem;        /* 36px */
    --font-size-h2: 2.5rem;         /* 40px */
    --font-size-h3: 1.5rem;         /* 24px */
    --font-size-h4: 1.25rem;        /* 20px */
    --space-section: 30px;
    --space-page-desktop: 100px;
  }

  .hero-split__carousel {
    aspect-ratio: 16 / 9;
  }

  .article-main {
    max-width: 880px;
  }
  .hero-split__slides {
    left:-50px;
  }

  .grid-main {
    grid-template-columns: 1fr 360px;
  }

  .nav__inner {
    padding: 0 var(--space-page-desktop);
  }

  .container {
    padding: 0 var(--space-page-desktop);
  }

  .footer__inner {
    padding: 0 var(--space-page-desktop);
  }
  .section--era-health {
  /* 分辨率不够的时候 需要取消 */
     /* 背景图路径替换成你的图片 */
  background-image: url("https://img.vivijk.com/images/main_bg.jpg");
  /* 核心：水平居中、垂直靠顶部 */
  background-position: center -800px;
  /* 禁止重复平铺 */
  background-repeat: no-repeat;
}

/* ----------------------------------------------------------
   7. Hero Split Layout (左图右文)
   ---------------------------------------------------------- */
.hero-split {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  /* 分辨率不够的时候 需要取消 */
     /* 背景图路径替换成你的图片 */
  background-image: url("https://img.vivijk.com/images/main_bg.jpg");
  /* 核心：水平居中、垂直靠顶部 */
  background-position: center top;
  /* 禁止重复平铺 */
  background-repeat: no-repeat;
  min-height:800px;
  
}
}

/* ----------------------------------------------------------
   20. Animations
   ---------------------------------------------------------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-in {
  animation: fadeIn 0.4s ease forwards;
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  animation: fadeInUp 0.5s ease forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0.05s; }
.stagger-children > *:nth-child(2) { animation-delay: 0.10s; }
.stagger-children > *:nth-child(3) { animation-delay: 0.15s; }
.stagger-children > *:nth-child(4) { animation-delay: 0.20s; }
.stagger-children > *:nth-child(5) { animation-delay: 0.25s; }
.stagger-children > *:nth-child(6) { animation-delay: 0.30s; }
.stagger-children > *:nth-child(7) { animation-delay: 0.35s; }
.stagger-children > *:nth-child(8) { animation-delay: 0.40s; }

/* ----------------------------------------------------------
   21. Print Styles
   ---------------------------------------------------------- */
@media print {
  .nav,
  .footer,
  .hero-split,
  .comments-section {
    display: none;
  }
  
  body {
    background: #fff;
    color: #000;
  }
  
  .article {
    max-width: 100%;
  }
  
  a {
    text-decoration: underline;
  }
}