/* ========== 1. 变量与重置 ========== */
:root {
  --lt-cream: #FAF3E8;
  --lt-ink: #1F1A17;
  --lt-gold: #F5C518;
  --lt-flame: #FF5E0A;
  --lt-night: #0D0D0D;
  --lt-blue: #00E5FF;
  --lt-red: #C9302C;
  --lt-green: #7AE0A0;

  --lt-font-title: "站酷庆科黄油体", Impact, "黑体", "Microsoft YaHei", sans-serif;
  --lt-font-body: "思源黑体", "Noto Sans SC", "微软雅黑", "PingFang SC", sans-serif;
  --lt-font-mono: "Cascadia Mono", "SF Mono", Consolas, "Liberation Mono", monospace;

  --lt-border: 3px solid var(--lt-ink);
  --lt-shadow: 6px 6px 0 var(--lt-ink);
  --lt-shadow-sm: 3px 3px 0 var(--lt-ink);
  --lt-container-w: 1240px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  font-family: var(--lt-font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--lt-ink);
  background-color: var(--lt-cream);
  background-image:
    linear-gradient(rgba(31, 26, 23, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 26, 23, 0.035) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--lt-font-title);
  line-height: 1.25;
  color: var(--lt-ink);
  margin-bottom: 0.5em;
}

p, ul, ol, dl {
  margin-bottom: 1em;
}

a {
  color: var(--lt-flame);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover {
  color: var(--lt-ink);
  border-bottom-color: var(--lt-gold);
}

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

/* ========== 2. 布局工具 ========== */
.lt-container {
  width: 100%;
  max-width: var(--lt-container-w);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ========== 3. 跳跃链接 ========== */
.lt-skips {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 3000;
  display: inline-block;
  padding: 10px 24px;
  background: var(--lt-gold);
  color: var(--lt-night);
  font-weight: 700;
  font-size: 14px;
  border: 2px solid var(--lt-ink);
  border-radius: 0 0 8px 0;
}

.lt-skips:focus {
  left: 0;
  outline: none;
}

/* ========== 4. 滚动进度条 ========== */
.lt-scrollbar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2000;
  width: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--lt-gold), var(--lt-flame));
  box-shadow: 0 0 8px rgba(245, 197, 24, 0.6);
  pointer-events: none;
}

/* ========== 5. 头部胶囊 ========== */
.lt-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 12px 16px;
  pointer-events: none;
}

.lt-header__inner {
  position: relative;
  pointer-events: auto;
  max-width: calc(var(--lt-container-w) + 32px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 10px 8px 14px;
  background: var(--lt-night);
  border: 2px solid var(--lt-ink);
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(245, 197, 24, 0.55), 5px 5px 0 rgba(13, 13, 13, 0.28);
}

/* ========== 6. 品牌标识 ========== */
.lt-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--lt-cream);
  border-bottom: none;
}

.lt-logo:hover {
  color: var(--lt-cream);
}

.lt-logo__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--lt-gold);
  color: var(--lt-night);
  font-family: var(--lt-font-title);
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  transform: rotate(-8deg);
  border: 2px solid var(--lt-ink);
  box-shadow: 3px 3px 0 var(--lt-flame);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.lt-logo:hover .lt-logo__mark {
  transform: rotate(0deg) scale(1.04);
  box-shadow: 4px 4px 0 var(--lt-gold);
}

.lt-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.lt-logo__name {
  font-family: var(--lt-font-title);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--lt-gold);
  white-space: nowrap;
}

.lt-logo__sub {
  font-family: var(--lt-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(250, 243, 232, 0.65);
  white-space: nowrap;
}

/* ========== 7. 主导航 ========== */
.lt-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
  margin-left: auto;
  flex-wrap: wrap;
}

.lt-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 13px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  color: rgba(250, 243, 232, 0.88);
  border: 2px solid transparent;
  border-radius: 999px;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.lt-nav__link::before {
  content: attr(data-index);
  font-family: var(--lt-font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--lt-gold);
  transition: color 0.2s ease;
}

.lt-nav__link:hover {
  color: var(--lt-gold);
  background: rgba(245, 197, 24, 0.1);
  border-bottom-color: transparent;
}

.lt-nav__link[aria-current="page"] {
  background: var(--lt-gold);
  color: var(--lt-night);
  border-color: var(--lt-gold);
  box-shadow: 0 2px 0 rgba(13, 13, 13, 0.25);
}

.lt-nav__link[aria-current="page"]::before {
  color: var(--lt-night);
}

/* ========== 8. 移动端导航按钮 ========== */
.lt-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex-shrink: 0;
  width: auto;
  padding: 8px 16px 8px 14px;
  background: var(--lt-night);
  border: 2px solid var(--lt-gold);
  border-radius: 999px;
  cursor: pointer;
  font-family: var(--lt-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lt-gold);
  transition: background 0.2s ease, color 0.2s ease;
}

.lt-nav-toggle__icon {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.lt-nav-toggle__line {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--lt-gold);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.2s ease;
}

.lt-nav-toggle__label {
  font-size: 12px;
  line-height: 1;
}

.lt-nav-toggle:hover,
.lt-nav-toggle[aria-expanded="true"] {
  background: var(--lt-gold);
  color: var(--lt-night);
}

.lt-nav-toggle:hover .lt-nav-toggle__line,
.lt-nav-toggle[aria-expanded="true"] .lt-nav-toggle__line {
  background: var(--lt-night);
}

.lt-nav-toggle[aria-expanded="true"] .lt-nav-toggle__line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.lt-nav-toggle[aria-expanded="true"] .lt-nav-toggle__line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ========== 9. 通用按钮 ========== */
.lt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 30px;
  background: var(--lt-gold);
  color: var(--lt-night);
  font-family: var(--lt-font-body);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  border: 3px solid var(--lt-ink);
  border-radius: 999px;
  box-shadow: 4px 4px 0 var(--lt-ink);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  text-align: center;
}

.lt-btn:hover {
  background: var(--lt-flame);
  color: var(--lt-cream);
  border-color: var(--lt-ink);
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--lt-ink);
}

.lt-btn--ghost {
  background: transparent;
  color: var(--lt-gold);
  border-color: var(--lt-gold);
  box-shadow: none;
}

.lt-btn--ghost:hover {
  background: var(--lt-gold);
  color: var(--lt-night);
  box-shadow: 4px 4px 0 rgba(13, 13, 13, 0.25);
}

/* ========== 10. 面包屑 ========== */
.lt-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  font-family: var(--lt-font-mono);
  font-size: 13px;
  color: var(--lt-ink);
}

.lt-breadcrumb__link {
  color: var(--lt-ink);
  border-bottom: 2px solid transparent;
}

.lt-breadcrumb__link:hover {
  color: var(--lt-flame);
  border-bottom-color: var(--lt-flame);
}

.lt-breadcrumb__sep {
  opacity: 0.45;
  font-size: 12px;
}

.lt-breadcrumb [aria-current="page"] {
  color: var(--lt-flame);
  font-weight: 700;
}

/* ========== 11. 图片容器 ========== */
.lt-media {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(rgba(31, 26, 23, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 26, 23, 0.05) 1px, transparent 1px),
    #E8DCC8;
  background-size: 20px 20px;
  border: 3px solid var(--lt-ink);
  box-shadow: var(--lt-shadow-sm);
}

.lt-media--169 { aspect-ratio: 16 / 9; }
.lt-media--43 { aspect-ratio: 4 / 3; }
.lt-media--11 { aspect-ratio: 1 / 1; }

.lt-media > img,
.lt-media > video,
.lt-media > [data-media] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.lt-media__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--lt-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: rgba(31, 26, 23, 0.5);
  background: transparent;
}

/* ========== 12. 等宽索引标签 ========== */
.lt-index-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--lt-font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lt-flame);
  margin-bottom: 14px;
}

.lt-index-tag::before {
  content: "//";
  color: var(--lt-ink);
  font-weight: 700;
}

/* ========== 13. Bento 网格 ========== */
.lt-grid-bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.lt-grid-bento > * {
  min-width: 0;
}

/* ========== 14. 主内容区 ========== */
#main-content {
  min-height: 45vh;
  display: block;
}

#main-content:focus {
  outline: none;
}

/* ========== 15. 页脚 ========== */
.lt-foot {
  position: relative;
  background: var(--lt-night);
  background-image:
    linear-gradient(rgba(250, 243, 232, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(250, 243, 232, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  color: rgba(250, 243, 232, 0.82);
  margin-top: 72px;
  padding-top: 0;
}

.lt-foot__stripe {
  height: 5px;
  background: linear-gradient(90deg, var(--lt-gold) 0%, var(--lt-flame) 55%, transparent 100%);
}

.lt-foot__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding: 52px 0 36px;
}

.lt-foot__logotext {
  font-family: var(--lt-font-title);
  font-size: 32px;
  font-weight: 700;
  color: var(--lt-gold);
  letter-spacing: 0.06em;
  line-height: 1.2;
}

.lt-foot__lead {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: rgba(250, 243, 232, 0.6);
  margin-top: 2px;
  font-family: var(--lt-font-mono);
}

.lt-foot__trust {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(250, 243, 232, 0.72);
  margin-top: 16px;
  max-width: 420px;
}

.lt-foot__legend {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
}

.lt-foot__swatch {
  width: 24px;
  height: 24px;
  border: 2px solid rgba(250, 243, 232, 0.4);
  border-radius: 4px;
  box-shadow: 0 0 0 1px rgba(13, 13, 13, 0.6);
}

.lt-foot__swatch--gold { background: var(--lt-gold); }
.lt-foot__swatch--flame { background: var(--lt-flame); }
.lt-foot__swatch--blue { background: var(--lt-blue); }
.lt-foot__swatch--cream { background: var(--lt-cream); }

.lt-foot__legendtext {
  font-family: var(--lt-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(250, 243, 232, 0.5);
}

.lt-foot__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--lt-cream);
  letter-spacing: 0.06em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(245, 197, 24, 0.4);
  display: flex;
  align-items: center;
  gap: 8px;
}

.lt-foot__num {
  font-family: var(--lt-font-mono);
  font-size: 12px;
  color: var(--lt-gold);
  letter-spacing: 0.1em;
}

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

.lt-foot__list li {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(250, 243, 232, 0.75);
}

.lt-foot__list a {
  color: rgba(250, 243, 232, 0.75);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, padding-left 0.2s ease;
}

.lt-foot__list a:hover {
  color: var(--lt-gold);
  border-bottom-color: var(--lt-flame);
  padding-left: 6px;
}

.lt-foot__label {
  display: block;
  font-family: var(--lt-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(245, 197, 24, 0.6);
  text-transform: uppercase;
  margin-bottom: 2px;
}

.lt-foot__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 20px 0 22px;
  border-top: 1px solid rgba(250, 243, 232, 0.12);
  font-family: var(--lt-font-mono);
  font-size: 12px;
  color: rgba(250, 243, 232, 0.55);
}

.lt-foot__copy,
.lt-foot__icp {
  margin: 0;
}

/* ========== 16. 焦点可见 ========== */
:focus-visible {
  outline: 3px solid var(--lt-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

.lt-nav__link:focus-visible {
  outline-color: var(--lt-blue);
  outline-offset: 2px;
}

.lt-nav-toggle:focus-visible {
  outline: 3px solid var(--lt-blue);
  outline-offset: 2px;
}

.lt-btn:focus-visible {
  outline-color: var(--lt-blue);
  outline-offset: 3px;
}

/* ========== 17. 响应式 ========== */
@media (max-width: 1024px) {
  .lt-foot__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .lt-nav__link {
    padding: 6px 10px;
    font-size: 14px;
  }

  .lt-nav__link::before {
    font-size: 10px;
  }
}

@media (max-width: 900px) {
  .lt-header {
    padding: 8px 12px;
  }

  .lt-header__inner {
    border-radius: 20px;
    padding: 8px 8px 8px 12px;
    box-shadow: 0 0 0 1px rgba(245, 197, 24, 0.5), 4px 4px 0 rgba(13, 13, 13, 0.22);
  }

  .lt-logo__mark {
    width: 38px;
    height: 38px;
    font-size: 22px;
  }

  .lt-logo__name {
    font-size: 18px;
  }

  .lt-logo__sub {
    font-size: 10px;
  }

  .lt-nav-toggle {
    display: inline-flex;
  }

  .lt-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin-left: 0;
    padding: 14px;
    background: var(--lt-night);
    border: 2px solid var(--lt-gold);
    border-radius: 16px;
    box-shadow: 6px 6px 0 rgba(13, 13, 13, 0.45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }

  .lt-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .lt-nav__link {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 10px;
    justify-content: flex-start;
    border: 1px solid transparent;
  }

  .lt-nav__link::before {
    width: 2.2em;
  }

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

@media (max-width: 640px) {
  .lt-foot__grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 0 28px;
  }

  .lt-foot__trust {
    max-width: 100%;
  }

  .lt-foot__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .lt-grid-bento {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .lt-btn {
    padding: 12px 24px;
    font-size: 15px;
  }
}

/* ========== 18. 减少动效偏好 ========== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .lt-scrollbar {
    display: none;
  }

  .lt-logo__mark {
    transform: rotate(0deg);
  }

  .lt-logo:hover .lt-logo__mark {
    transform: none;
  }

  .lt-nav {
    transition: none;
  }
}