/* =========================================
   爱游戏官网 — 共享样式 /assets/site.css
   ========================================= */

:root {
  --color-primary: #0B1D3A;
  --color-primary-dark: #060E1A;
  --color-primary-light: #1B3A5C;
  --color-secondary: #6E6E6A;
  --color-accent-moss: #5A7D6A;
  --color-accent-terracotta: #C67D5C;
  --color-background: #F5F0E6;
  --color-background-alt: #EDE6D9;
  --color-text-light: #F5F0E6;
  --color-text-dark: #0B1D3A;
  --color-highlight: #E0A458;
  --color-neon: #C8F135;

  --font-display: "Archivo Black", "Arial Black", "PingFang SC Heavy", "Noto Sans SC", sans-serif;
  --font-heading: "Roboto Condensed", "Arial Narrow", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", "Consolas", monospace;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --container-max: 1280px;
  --header-h: 88px;
}

/* 1. Reset 与基础排版 */

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-dark);
  background: var(--color-background);
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  line-height: 1.2;
}

p { margin: 0 0 1em; }

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

ul, ol { padding-left: 1.25em; }

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

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

:focus-visible {
  outline: 3px solid var(--color-neon);
  outline-offset: 2px;
}

/* 2. 容器与章节节奏 */

.container {
  width: min(100% - 48px, var(--container-max));
  margin-inline: auto;
}

.section {
  padding-block: clamp(56px, 9vw, 104px);
}

.section-alt {
  background: var(--color-background-alt);
}

.section-dark {
  background: var(--color-primary);
  color: var(--color-text-light);
}

.section-narrow .container {
  max-width: 780px;
}

.section-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(28px, 5vw, 56px);
}

.section-header-left {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 48rem;
}

.section-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--color-secondary);
  white-space: nowrap;
}

.section-header-right a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.section-kicker {
  font-family: var(--font-heading);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--color-secondary);
}

.section-index {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--color-accent-terracotta);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.2vw, 4rem);
  line-height: .95;
  letter-spacing: -.02em;
  text-transform: uppercase;
  margin: 0;
}

.section-dark .section-kicker { color: var(--color-neon); }
.section-dark .section-index { color: var(--color-highlight); }
.section-dark .section-title { color: var(--color-text-light); }

/* 3. 头部框架 */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  color: var(--color-text-light);
  border-bottom: 4px solid var(--color-neon);
}

.scroll-progress {
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 4px;
  background: rgba(245, 240, 230, .15);
  z-index: 3;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--color-neon);
  box-shadow: 0 0 10px rgba(200, 241, 53, .6);
}

.header-topline {
  background: var(--color-primary-dark);
  border-bottom: 1px solid rgba(245, 240, 230, .2);
}

.header-topline-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 36px;
  font-size: .75rem;
  letter-spacing: .06em;
}

.topline-index {
  font-family: var(--font-mono);
  color: var(--color-highlight);
}

.topline-tag {
  font-family: var(--font-heading);
  color: rgba(245, 240, 230, .65);
  text-transform: uppercase;
  letter-spacing: .14em;
}

.topline-link {
  color: var(--color-neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

.topline-link:hover { border-bottom-color: var(--color-neon); }

.header-main {
  background: linear-gradient(100deg, var(--color-primary-dark), var(--color-primary));
}

.header-main-inner {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.2vw, 32px);
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-neon);
  color: var(--color-primary-dark);
  border: 2px solid var(--color-primary-dark);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .04em;
  padding: .2rem .55rem;
  transform: skewX(-8deg);
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: .05em;
  color: var(--color-text-light);
  white-space: nowrap;
}

.brand-text em {
  font-style: normal;
  color: var(--color-highlight);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 32px);
  margin-inline: auto;
}

.nav-link {
  position: relative;
  color: rgba(245, 240, 230, .85);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding-block: .6rem;
  border-bottom: 2px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.nav-link::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 5px;
  height: 5px;
  background: var(--color-neon);
  transform: translateY(-50%) rotate(45deg);
  opacity: 0;
  transition: opacity .2s ease;
}

.nav-link:hover {
  color: var(--color-neon);
  border-bottom-color: var(--color-neon);
}

.nav-link:hover::before { opacity: 1; }

.nav-link[aria-current="page"] {
  color: var(--color-neon);
  border-bottom-color: var(--color-accent-terracotta);
}

.nav-link[aria-current="page"]::before { opacity: 1; }

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.header-tools::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-neon);
  transform: skewX(-45deg);
  opacity: .7;
}

.tool-link {
  padding: .5rem .4rem;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(245, 240, 230, .8);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.tool-link:hover {
  color: var(--color-neon);
  border-bottom-color: var(--color-neon);
}

.btn-header-member {
  background: var(--color-accent-terracotta);
  border-color: var(--color-primary-dark);
  color: #fff;
  font-size: .75rem;
  padding: .55rem 1.1rem;
  box-shadow: 3px 3px 0 rgba(6, 14, 26, .8);
}

.btn-header-member:hover {
  box-shadow: 5px 5px 0 rgba(6, 14, 26, .85);
  background: var(--color-highlight);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: transparent;
  border: 1px solid rgba(245, 240, 230, .4);
  cursor: pointer;
  padding: 0;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-light);
  transition: transform .25s ease, opacity .2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) { opacity: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 4. 移动端导航 */

@media (max-width: 1023.5px) {
  .header-main-inner { gap: 12px; }

  .site-nav {
    position: fixed;
    inset: 0;
    margin: 0;
    padding: 100px 40px 40px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-primary-dark);
    transform: translateX(100%);
    transition: transform .3s cubic-bezier(.2, .8, .2, 1), visibility .3s;
    visibility: hidden;
    overflow-y: auto;
    z-index: 190;
  }

  .site-nav[data-open] {
    transform: none;
    visibility: visible;
  }

  .site-nav .nav-link {
    font-size: 1.1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(245, 240, 230, .25);
    width: 100%;
  }

  .site-nav .nav-link::before {
    left: auto;
    right: 0;
  }

  .header-tools::before { display: none; }

  .tool-link {
    border: 1px solid rgba(245, 240, 230, .28);
    padding: .45rem .8rem;
  }

  .btn-header-member { padding: .45rem .8rem; }
  .nav-toggle { display: inline-flex; }
  .topline-tag { display: none; }
}

/* 5. 页脚 */

.site-footer {
  background: var(--color-primary-dark);
  color: var(--color-text-light);
  border-top: 4px solid var(--color-neon);
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: clamp(24px, 4vw, 64px);
  padding-block: 64px 48px;
}

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

.footer-manifesto {
  margin: 16px 0 20px;
  max-width: 36em;
  font-size: .95rem;
  line-height: 1.8;
  color: rgba(245, 240, 230, .7);
}

.footer-index {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--color-neon);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(245, 240, 230, .25);
  font-family: var(--font-heading);
  font-size: .875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-highlight);
}

.footer-col-index {
  font-family: var(--font-mono);
  color: var(--color-neon);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  color: rgba(245, 240, 230, .75);
  text-decoration: none;
  font-size: .9rem;
  transition: color .2s ease, padding-left .2s ease;
}

.footer-link:hover {
  color: var(--color-neon);
  padding-left: 4px;
}

.footer-contact-col { gap: 8px; }

.footer-contact-line {
  display: block;
  line-height: 1.6;
}

.footer-base {
  border-top: 1px solid rgba(245, 240, 230, .18);
  padding-block: 16px;
}

.footer-base-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 16px;
  font-size: .8rem;
  letter-spacing: .04em;
  color: rgba(245, 240, 230, .6);
}

.footer-base-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-base-link:hover {
  color: var(--color-neon);
}

.footer-icp { font-family: var(--font-mono); }
.footer-base-sep { opacity: .5; }

.footer-feedback {
  position: relative;
  margin-left: auto;
}

.footer-feedback-toggle {
  border: 1px solid rgba(245, 240, 230, .4);
  background: rgba(245, 240, 230, .06);
  color: var(--color-text-light);
  padding: .5rem 1.25rem;
  cursor: pointer;
  font-size: .8rem;
  letter-spacing: .06em;
  transition: border-color .2s ease, background .2s ease, color .2s ease;
}

.footer-feedback-toggle:hover {
  background: rgba(200, 241, 53, .15);
  border-color: var(--color-neon);
  color: var(--color-neon);
}

.footer-feedback-panel {
  position: absolute;
  right: 0;
  bottom: calc(100% + 12px);
  width: 280px;
  max-width: calc(100vw - 40px);
  background: var(--color-background);
  color: var(--color-text-dark);
  border: 2px solid var(--color-primary);
  box-shadow: 8px 8px 0 rgba(6, 14, 26, .85);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 30;
}

.footer-feedback-panel[hidden] { display: none; }

.feedback-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: .9rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 10px;
}

.feedback-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.feedback-label {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-secondary);
}

.feedback-demo {
  display: block;
  padding: 8px 0;
  border-bottom: 2px dotted var(--color-secondary);
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--color-text-dark);
}

.btn-feedback-send {
  font-size: .75rem;
  padding: .6rem 1rem;
}

.feedback-tip {
  margin: 0;
  font-size: .8rem;
  color: var(--color-accent-moss);
}

.feedback-tip[hidden] { display: none; }

/* 6. 按钮系统 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font-family: var(--font-heading);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-primary);
  background: transparent;
  border: 2px solid var(--color-primary);
  padding: .75rem 1.5rem;
  cursor: pointer;
  transition: all .2s ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--color-primary);
}

.btn-primary {
  background: var(--color-accent-terracotta);
  color: #fff;
  border-color: var(--color-primary-dark);
}

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

.btn-neon {
  background: var(--color-neon);
  color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

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

.btn-outline { border-color: currentColor; }

/* 7. 面包屑、页面标题与导语 */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  font-size: .8125rem;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  opacity: .5;
}

.breadcrumb a {
  color: var(--color-secondary);
  text-decoration: none;
}

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

.page-hero {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding-block: clamp(56px, 10vw, 120px);
  overflow: hidden;
  position: relative;
}

.page-hero .container { position: relative; z-index: 1; }

.page-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 64px;
  background: var(--color-primary-dark);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 16% 100%);
  opacity: .6;
}

.page-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7.5vw, 5.6rem);
  line-height: .92;
  letter-spacing: -.02em;
  text-transform: uppercase;
}

.page-title .text-outline {
  -webkit-text-stroke: 2px currentColor;
  color: transparent;
}

.page-hero-sub {
  margin: 1.25rem 0 0;
  max-width: 56ch;
  font-size: 1.05rem;
  line-height: 1.8;
  color: rgba(245, 240, 230, .82);
}

.page-hero .breadcrumb a { color: rgba(245, 240, 230, .6); }
.page-hero .breadcrumb a:hover { color: var(--color-neon); }

.lead {
  font-size: 1.125rem;
  line-height: 1.85;
  color: var(--color-text-dark);
  max-width: 62ch;
}

/* 8. 网格系统 */

.grid {
  display: grid;
  gap: 24px;
}

.grid-gap-lg { gap: 40px; }

.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-6 { grid-column: span 6; }
.col-span-8 { grid-column: span 8; }
.col-span-12 { grid-column: span 12; }

@media (max-width: 1023.5px) {
  .grid-cols-3, .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cols-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-span-3, .col-span-4, .col-span-6, .col-span-8 { grid-column: span 6; }
}

@media (max-width: 639.5px) {
  .grid-cols-2, .grid-cols-3, .grid-cols-4, .grid-cols-12 { grid-template-columns: 1fr; }
  .col-span-3, .col-span-4, .col-span-6, .col-span-8, .col-span-12 { grid-column: span 12; }
}

/* 9. 卡片 */

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--color-background);
  border: 2px solid var(--color-primary);
  padding: 24px;
  box-shadow: 6px 6px 0 rgba(11, 29, 58, .9);
}

.card-dark {
  background: var(--color-primary);
  color: var(--color-text-light);
  box-shadow: 6px 6px 0 rgba(6, 14, 26, .9);
}

.card-flat { box-shadow: none; }

.card-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  line-height: 1.25;
  text-transform: uppercase;
  letter-spacing: .04em;
  margin: 0;
}

.card-body {
  font-size: .95rem;
  line-height: 1.7;
  color: inherit;
}

.card-link {
  color: inherit;
  text-decoration: none;
}

.card-link .card-title { transition: color .2s ease; }

.card-link:hover .card-title { color: var(--color-accent-terracotta); }

/* 10. 数据数字 */

.data-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--color-accent-terracotta);
}

.data-num small {
  display: block;
  margin-top: .5rem;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--color-secondary);
}

.data-num[data-color="neon"] { color: var(--color-neon); }
.data-num[data-color="moss"] { color: var(--color-accent-moss); }

/* 11. 图片容器 */

.image-frame {
  display: block;
  position: relative;
  overflow: hidden;
  background: var(--color-background-alt);
  border: 2px solid var(--color-primary);
  box-shadow: 8px 8px 0 rgba(11, 29, 58, .85);
}

.image-frame:empty::after {
  content: "IMAGE — 图片位";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--color-secondary);
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}

.image-frame:hover img { transform: scale(1.03); }

.image-frame-ratio-16-9 { aspect-ratio: 16 / 9; }
.image-frame-ratio-4-3 { aspect-ratio: 4 / 3; }
.image-frame-ratio-1-1 { aspect-ratio: 1 / 1; }

.image-frame-carve {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), 0 100%);
}

/* 12. 专题研究板 */

.research-board {
  border: 2px solid var(--color-primary);
  box-shadow: 8px 8px 0 rgba(11, 29, 58, .9);
  background: var(--color-background);
}

.research-board-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: .65rem 1.25rem;
  background: var(--color-primary);
  color: var(--color-text-light);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .8rem;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.research-board-index {
  font-family: var(--font-mono);
  color: var(--color-neon);
}

.research-board-body { padding: 1.25rem; }

/* 13. 表格、列表与导引线 */

.table-data-wrap {
  overflow-x: auto;
  border: 2px solid var(--color-primary);
  box-shadow: 6px 6px 0 rgba(11, 29, 58, .85);
  background: var(--color-background);
}

.table-data {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  background: var(--color-background);
}

.table-data th,
.table-data td {
  padding: .8rem 1rem;
  border-bottom: 1px solid var(--color-secondary);
  text-align: left;
  vertical-align: top;
}

.table-data thead th {
  background: var(--color-primary);
  color: var(--color-text-light);
  font-family: var(--font-heading);
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.table-data tbody tr:hover td { background: var(--color-background-alt); }

.list-line {
  list-style: none;
  margin: 0;
  padding: 0;
}

.list-line li {
  border-bottom: 1px solid var(--color-secondary);
  padding: .65rem 0;
}

.dotted-leader {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: .9rem;
  color: var(--color-text-dark);
}

.dotted-leader .leader-line {
  flex: 1;
  border-bottom: 2px dotted var(--color-secondary);
}

.dotted-leader .leader-value {
  font-family: var(--font-mono);
  font-weight: 700;
}

/* 14. 斜切分隔 */

.divider-slant {
  display: block;
  width: 100%;
  height: 56px;
  background: var(--color-primary);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 58%);
}

.divider-slant.alt {
  background: var(--color-background-alt);
  height: 32px;
}

/* 15. 滚动显现 */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .55s ease, transform .55s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* 16. 主内容与页脚反馈区 */

.main-content {
  background: var(--color-background);
  min-height: 65vh;
}

/* 17. 响应式补充 */

@media (max-width: 920px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .footer-feedback { margin-left: 0; }
  .footer-feedback-panel { right: 8px; }
}

@media (max-width: 639.5px) {
  .container { width: min(100% - 32px, var(--container-max)); }
  .header-main-inner { height: 72px; }
  .brand-text { font-size: 1.05rem; }
  .tool-link { font-size: .7rem; }
  .breadcrumb { font-size: .75rem; }
}

/* 18. 降低动态偏好 */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav { transition: none; }
}