/* ==========================================================================
   亚新综合体育 · 全站共享样式 /assets/site.css
   ========================================================================== */

/* ---- 1. CSS 变量 ---- */
:root {
  --deep-blue: #0A1B3D;
  --deep-blue-light: #1C3D6B;
  --gold: #D4AF37;
  --gold-light: #E6C86B;
  --emerald: #00B386;
  --orange: #FF6B35;
  --light-bg: #F5F7FA;
  --dark-text: #1E2A3A;
  --gray-text: #5A6B7B;
  --white: #FFFFFF;
  --border-color: #E8ECF0;

  --font-display: 'Archivo Black', 'Source Han Sans Heavy', '思源黑体', 'Noto Sans CJK SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Source Han Sans SC', '思源黑体', 'Noto Sans CJK SC', 'Microsoft YaHei', sans-serif;

  --font-size-h1: clamp(2.5rem, 5vw, 4rem);
  --font-size-h2: clamp(1.75rem, 3vw, 2.375rem);
  --font-size-h3: clamp(1.375rem, 2vw, 1.5rem);

  --line-height-heading: 1.2;
  --line-height-body: 1.6;

  --container-width: 1280px;
  --container-wide: 1440px;
  --container-narrow: 860px;
  --container-pad: clamp(1rem, 3vw, 2rem);

  --header-h: 76px;

  --transition-fast: 0.2s ease;
  --transition-slow: 0.4s ease;
  --shadow-card: 0 4px 20px rgba(10, 27, 61, 0.08);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--line-height-body);
  color: var(--dark-text);
  background: var(--light-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.no-scroll {
  overflow: hidden;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: var(--line-height-heading);
  color: var(--deep-blue);
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

::selection {
  background: var(--gold);
  color: var(--deep-blue);
}

/* ---- 3. 布局容器 ---- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

main {
  display: block;
  overflow: clip;
}

/* ---- 4. 通用按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  color: var(--deep-blue);
  background: var(--gold);
  border: 2px solid var(--gold);
  clip-path: polygon(14px 0, 100% 0, calc(100% - 14px) 100%, 0 100%);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
}

.btn:hover {
  background: var(--gold-light);
  border-color: var(--gold-light);
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.35);
}

.btn--outline {
  background: transparent;
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: none;
}

.btn--outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #FFFFFF;
  box-shadow: none;
}

.btn--small {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

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

/* ---- 5. 头部 ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: linear-gradient(180deg, rgba(10, 27, 61, 0.92) 0%, rgba(10, 27, 61, 0.62) 55%, transparent 100%);
  transition: background var(--transition-slow), box-shadow var(--transition-slow);
}

.site-header.is-scrolled {
  background: var(--deep-blue);
  box-shadow: 0 4px 20px rgba(10, 27, 61, 0.25);
}

.site-header__inner {
  max-width: var(--container-width);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 2.5vw, 2rem);
}

/* 跳过链接 */
.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 3000;
  background: var(--gold);
  color: var(--deep-blue);
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

/* 阅读进度条 */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1500;
  pointer-events: none;
}

.reading-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gold), var(--orange));
  transition: width 0.1s linear;
}

/* 品牌 */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #FFFFFF;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  height: 2.25rem;
  padding: 0 0.5rem;
  background: var(--gold);
  color: var(--deep-blue);
  font-size: 0.875rem;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.site-brand__text {
  font-size: 1.125rem;
}

/* 导航 */
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  display: inline-block;
  padding: 0.5rem 0.875rem;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: #FFFFFF;
  background: rgba(212, 175, 55, 0.15);
}

.site-nav__link[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 头部 CTA */
.site-header__cta {
  flex-shrink: 0;
}

/* 移动端切换按钮 */
.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0.5rem;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 4px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.site-header__toggle:hover {
  border-color: var(--gold);
  background: rgba(212, 175, 55, 0.12);
}

.site-header__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: #FFFFFF;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:first-child {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:last-child {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端断点 */
@media (max-width: 767px) {
  .site-header {
    background: rgba(10, 27, 61, 0.88);
  }

  .site-header.is-scrolled {
    background: var(--deep-blue);
  }

  .site-header__cta {
    display: none;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 990;
    background: var(--deep-blue);
    padding: 2rem var(--container-pad);
    transform: translateX(100%);
    transition: transform 0.35s ease;
    overflow-y: auto;
  }

  .site-nav[data-open="true"] {
    transform: translateX(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 1rem 0.5rem;
    font-size: 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    border-left: 4px solid transparent;
  }

  .site-nav__link[aria-current="page"] {
    border-left-color: var(--gold);
    background: rgba(212, 175, 55, 0.1);
  }
}

/* ---- 6. 页脚 ---- */
.site-footer {
  background: var(--deep-blue);
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9375rem;
  padding-top: clamp(3rem, 6vw, 5rem);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 0 var(--container-pad) clamp(2.5rem, 5vw, 4rem);
}

@media (min-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .site-footer__inner {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
  }
}

.site-footer__brand-name {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.site-footer__brand-name::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 24px;
  background: var(--gold);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  flex-shrink: 0;
}

.site-footer__blurb {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 1rem;
  max-width: 42ch;
}

.site-footer__trust {
  font-size: 0.875rem;
  color: var(--gold-light);
  border-left: 3px solid var(--gold);
  padding-left: 1rem;
  margin-top: 1rem;
  max-width: 48ch;
  line-height: 1.6;
}

.site-footer__heading {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.25rem;
}

.site-footer__list {
  display: grid;
  gap: 0.625rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer__list a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.site-footer__list a:hover {
  color: var(--gold-light);
  padding-left: 4px;
}

.site-footer__col--contact .site-footer__list {
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.25rem 0;
}

.site-footer__bottom-inner {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.875rem;
}

/* ---- 7. 面包屑 ---- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--gray-text);
  margin-bottom: 2rem;
}

.breadcrumb__list {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb__link {
  color: var(--gray-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb__link:hover {
  color: var(--deep-blue);
}

.breadcrumb__separator::before {
  content: '/';
  color: #B8C0C8;
  margin: 0 0.25rem;
}

.breadcrumb__current {
  color: var(--deep-blue);
  font-weight: 600;
}

/* ---- 8. 网格与分屏 ---- */
.grid {
  display: grid;
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

.grid--2,
.grid--3,
.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

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

.split-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}

@media (min-width: 1024px) {
  .split-layout {
    grid-template-columns: minmax(220px, 280px) 1fr;
    align-items: start;
  }

  .split-layout__aside {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }
}

/* ---- 9. 页面首屏 ---- */
.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep-blue);
  padding: calc(var(--header-h) + clamp(2.5rem, 6vw, 5rem)) 0 clamp(2.5rem, 6vw, 5rem);
  color: #FFFFFF;
}

.page-hero::after {
  content: '';
  position: absolute;
  right: -100px;
  bottom: -140px;
  width: 320px;
  height: 320px;
  background: var(--gold);
  opacity: 0.16;
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  transform: rotate(18deg);
  pointer-events: none;
}

.page-hero__title {
  color: #FFFFFF;
  font-size: var(--font-size-h1);
  max-width: 22ch;
  position: relative;
  z-index: 1;
}

/* ---- 10. 主题带 ---- */
.topic-band {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  position: relative;
}

.topic-band::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--gold), transparent);
  transform: skewX(-20deg);
  transform-origin: left;
}

.topic-band--blue {
  background: var(--deep-blue);
  color: #FFFFFF;
}

.topic-band--blue h1,
.topic-band--blue h2,
.topic-band--blue h3 {
  color: #FFFFFF;
}

.topic-band--gold {
  background: var(--gold);
  color: var(--deep-blue);
}

.topic-band--gold h1,
.topic-band--gold h2,
.topic-band--gold h3 {
  color: var(--deep-blue);
}

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

/* ---- 11. 编辑标题 ---- */
.section-heading {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-heading__number {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3rem;
  line-height: 1;
  color: var(--gold);
  white-space: nowrap;
}

.section-heading__text {
  margin: 0;
  font-size: var(--font-size-h2);
}

/* ---- 12. 编辑部目录 ---- */
.editorial-index {
  margin: 0;
  padding: 0;
  list-style: none;
}

.editorial-index__item {
  margin-bottom: 0.25rem;
}

.editorial-index__link {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.625rem 0.75rem;
  text-decoration: none;
  color: var(--deep-blue);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: background var(--transition-fast), color var(--transition-fast), padding-left var(--transition-fast);
}

.editorial-index__link:hover {
  background: var(--light-bg);
  padding-left: 1rem;
}

.editorial-index__link.is-active {
  background: var(--deep-blue);
  color: #FFFFFF;
}

.editorial-index__num {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 900;
  color: var(--gold);
}

/* ---- 13. 正文组件 ---- */
.lede {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.7;
  color: var(--deep-blue);
  font-weight: 500;
  border-left: 4px solid var(--gold);
  padding-left: 1.5rem;
  margin-bottom: 2rem;
}

.rich-text {
  font-size: 1.0625rem;
  line-height: 1.8;
}

.rich-text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  color: var(--deep-blue);
  margin-top: 3rem;
  margin-bottom: 1rem;
}

.rich-text h3 {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2vw, 1.625rem);
  color: var(--deep-blue);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.rich-text p {
  margin-bottom: 1.25rem;
}

.rich-text ul,
.rich-text ol {
  padding-left: 1.25rem;
  margin-bottom: 1.25rem;
}

.rich-text ul {
  list-style: disc;
}

.rich-text ol {
  list-style: decimal;
}

.side-note {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: 1.25rem 1.5rem 1.25rem 1rem;
  background: var(--gold-light);
  color: var(--deep-blue);
  font-size: 0.875rem;
  line-height: 1.6;
  clip-path: polygon(16px 0, 100% 0, 100% 100%, 0 100%);
  margin: 1.5rem 0;
}

.side-note strong {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  background: var(--deep-blue);
  padding: 0.125rem 0.5rem;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  align-self: flex-start;
  margin-bottom: 0.375rem;
}

/* ---- 14. 切角面板 ---- */
.clipped-panel {
  position: relative;
  background: var(--deep-blue);
  color: #FFFFFF;
  padding: clamp(1.5rem, 3vw, 2.5rem);
  clip-path: polygon(32px 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%, 0 32px);
}

.clipped-panel--gold {
  background: var(--gold);
  color: var(--deep-blue);
}

.clipped-panel--light {
  background: var(--light-bg);
  color: var(--dark-text);
  border: 1px solid var(--border-color);
}

/* ---- 15. 数据卡片 ---- */
.data-card {
  position: relative;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  transition: box-shadow var(--transition-slow), transform var(--transition-slow);
}

.data-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 4px;
  background: var(--gold);
  transform: skewX(-20deg);
  transform-origin: left;
}

.data-card--emerald::before {
  background: var(--emerald);
}

.data-card--orange::before {
  background: var(--orange);
}

.data-card:hover {
  box-shadow: 0 12px 32px rgba(10, 27, 61, 0.12);
  transform: translateY(-4px);
}

/* ---- 16. 数据统计 ---- */
.stat {
  padding: 1.25rem 0;
}

.stat__label {
  font-size: 0.75rem;
  color: var(--gray-text);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
}

.stat__value {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--deep-blue);
  line-height: 1.2;
  margin-top: 0.25rem;
}

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

.stat__value--emerald {
  color: var(--emerald);
}

.stat__value--orange {
  color: var(--orange);
}

/* ---- 17. 标签 ---- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(212, 175, 55, 0.15);
  color: var(--gold);
  border: 1px solid rgba(212, 175, 55, 0.3);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.tag--emerald {
  background: rgba(0, 179, 134, 0.12);
  color: var(--emerald);
  border-color: rgba(0, 179, 134, 0.25);
}

.tag--orange {
  background: rgba(255, 107, 53, 0.12);
  color: var(--orange);
  border-color: rgba(255, 107, 53, 0.25);
}

/* ---- 18. 媒体容器 ---- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  background: var(--deep-blue-light);
}

.media--ratio-16x9 {
  aspect-ratio: 16 / 9;
}

.media--ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.media--ratio-3x4 {
  aspect-ratio: 3 / 4;
}

.media--ratio-1x1 {
  aspect-ratio: 1 / 1;
}

.media--ratio-21x9 {
  aspect-ratio: 21 / 9;
}

.media > img,
.media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.media__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(10, 27, 61, 0.72) 100%);
}

/* ---- 19. 装饰 ---- */
.speed-line {
  display: block;
  height: 4px;
  width: 120px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-light) 60%, transparent 100%);
  transform: skewX(-20deg);
  margin: 1.5rem 0;
}

/* ---- 20. 滚动揭示 ---- */
[data-reveal] {
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

[data-reveal].is-pre-reveal {
  opacity: 0;
  transform: translateY(24px);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---- 21. 辅助功能与减少动效 ---- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .reading-progress__bar {
    transition: none;
  }

  .site-nav {
    transition: none;
  }
}

@media (max-width: 767px) {
  .site-header__toggle-bar:nth-child(n) {
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
}

/* ---- 22. 深色背景上的通用文本颜色辅助 ---- */
.text-white {
  color: #FFFFFF;
}

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

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

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

.text-muted-light {
  color: rgba(255, 255, 255, 0.7);
}

/* ---- 23. 卡片组间距 ---- */
.stack {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.stack--lg {
  gap: clamp(2rem, 5vw, 4rem);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }