/* ==========================================================================
   乐思赛场 · 共享样式表  /assets/site.css
   深蓝夜空 × 荧光绿 · 粗边框硬阴影 · 侧轴导览
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ol, ul {
  margin: 0;
}

ol,
ul { padding: 0; list-style: none; }

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

button,
input,
select,
textarea { font: inherit; color: inherit; margin: 0; }

button { background: none; border: 0; cursor: pointer; }

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

table { border-collapse: collapse; border-spacing: 0; width: 100%; }

hr { border: 0; margin: 0; }

[hidden] { display: none !important; }

/* --------------------------------------------------------------------------
   2. 设计令牌
   -------------------------------------------------------------------------- */
:root {
  /* 色彩 */
  --night:  #0A1730;
  --indigo: #14294A;
  --lime:   #35F0A2;
  --cyan:   #24D6E8;
  --orange: #FF8A3C;
  --violet: #7C5CFF;
  --mist:   #F4F6F9;
  --paper:  #E4E9F0;
  --ink:    #0D1526;
  --white:  #F7FAFF;
  --gray:   #8FA3B8;

  /* 字体族 */
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-cond: "Archivo Narrow", "Oswald", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-body: Inter, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* 排版阶梯 1.25 */
  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-16: 1rem;
  --fs-20: 1.25rem;
  --fs-25: 1.5625rem;
  --fs-31: 1.9375rem;
  --fs-39: 2.4375rem;
  --fs-49: 3.0625rem;
  --fs-61: 3.8125rem;

  /* 尺度 */
  --rail-w: 88px;
  --rail-h: 52px;
  --wrap: 1280px;
  --narrow: 720px;
  --edge: clamp(20px, 4vw, 40px);
  --section-y: clamp(72px, 9vw, 144px);

  /* 边框与阴影 */
  --bw: 3px;
  --shadow-hard: 8px 8px 0 var(--ink);
  --shadow-hard-sm: 4px 4px 0 var(--ink);

  /* 缓动 */
  --ease: cubic-bezier(.2, .7, .3, 1);
  --dur: .18s;
}

/* --------------------------------------------------------------------------
   3. 中文排版基底
   -------------------------------------------------------------------------- */
html { font-size: 100%; }

body {
  min-height: 100vh;
  background: var(--night);
  color: var(--white);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

p { text-wrap: pretty; }
h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.005em;
}

h1 { font-family: var(--font-serif); font-weight: 800; font-size: clamp(34px, 5vw, 61px); line-height: 1.08; letter-spacing: -0.01em; }
h2 { font-family: var(--font-serif); font-weight: 800; font-size: clamp(26px, 3.4vw, 39px); line-height: 1.15; letter-spacing: -0.005em; }
h3 { font-family: var(--font-cond); font-weight: 700; font-size: clamp(20px, 2vw, 25px); letter-spacing: 0.02em; }
h4 { font-family: var(--font-cond); font-weight: 700; font-size: var(--fs-20); letter-spacing: 0.02em; }

strong { font-weight: 700; color: var(--lime); }

.num,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.01em;
}

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

::selection {
  background: var(--lime);
  color: var(--ink);
}

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
  border-radius: 0;
}

/* --------------------------------------------------------------------------
   4. 阅读进度条
   -------------------------------------------------------------------------- */
.scroll-meter {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 95;
  pointer-events: none;
  background: rgba(228, 233, 240, 0.08);
}

.scroll-meter__fill {
  display: block;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lime) 0%, var(--cyan) 55%, var(--violet) 100%);
  will-change: transform;
}

/* --------------------------------------------------------------------------
   5. 跳过导航
   -------------------------------------------------------------------------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 12px;
  z-index: 120;
  padding: 12px 20px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.06em;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard-sm);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: 14px;
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   6. 轮次导览轴（移动端：底部数据条）
   -------------------------------------------------------------------------- */
.rail {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 80;
  height: var(--rail-h);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 16px;
  background: var(--indigo);
  border-top: 2px solid var(--lime);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.rail::-webkit-scrollbar { display: none; }

.rail__cap {
  flex: none;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  color: var(--lime);
  white-space: nowrap;
}

.rail__list {
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
}

.rail__node {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  background: var(--night);
  color: var(--gray);
  border: 2px solid rgba(247, 250, 255, 0.14);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.rail__node--live {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--ink);
  box-shadow: 0 0 0 2px rgba(53, 240, 162, 0.28);
}

.rail__range {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gray);
  white-space: nowrap;
  padding-left: 6px;
  border-left: 1px solid rgba(143, 163, 184, 0.35);
}

/* --------------------------------------------------------------------------
   7. 页头
   -------------------------------------------------------------------------- */
.site-header {
  position: relative;
  z-index: 60;
  background: var(--night);
  color: var(--white);
  border-bottom: 3px solid var(--indigo);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--lime) 0%, var(--cyan) 45%, var(--violet) 100%);
  opacity: 0.85;
}

.header-inner {
  width: min(100% - (var(--edge) * 2), var(--wrap));
  margin-inline: auto;
}

.header-top {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: clamp(22px, 3vw, 34px) 0 16px;
}

.masthead {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.masthead__brand {
  position: relative;
  display: block;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--white);
  padding-bottom: 10px;
}

.masthead__brand::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--lime) 0%, var(--cyan) 55%, var(--violet) 100%);
}

.masthead:hover .masthead__brand,
.masthead:focus-visible .masthead__brand {
  color: var(--lime);
}

.masthead__sub {
  display: block;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  text-indent: 0.24em;
  color: var(--gray);
  white-space: nowrap;
}

.header-nav-row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 12px 0 14px;
  border-top: 1px solid var(--indigo);
}

/* 导航 */
.primary-nav {
  grid-column: 2;
  justify-self: center;
  min-width: 0;
}

.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 2px 2px;
}

.primary-nav__list > li { display: block; }

.primary-nav__list a {
  display: block;
  padding: 10px 15px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper);
  border: 2px solid transparent;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.primary-nav__list a:hover {
  color: var(--lime);
  border-color: var(--indigo);
  background: var(--indigo);
}

.primary-nav__list a[aria-current="page"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--ink);
}

/* 汉堡按钮 */
.nav-toggle {
  grid-column: 1;
  justify-self: start;
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--indigo);
  color: var(--white);
  border: 2px solid var(--lime);
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
}

.nav-toggle:hover { background: var(--lime); color: var(--ink); }

.site-header[data-open] .nav-toggle {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--ink);
}

/* 页头 CTA */
.header-cta {
  grid-column: 3;
  justify-self: end;
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   8. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  background: var(--night);
  color: var(--white);
  border-top: 3px solid var(--lime);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 0;
  right: 0;
  height: 5px;
  pointer-events: none;
  background: repeating-linear-gradient(
    90deg,
    var(--lime) 0 18px,
    transparent 18px 42px
  );
  opacity: 0.3;
}

.footer__inner {
  width: min(100% - (var(--edge) * 2), var(--wrap));
  margin-inline: auto;
  padding: clamp(52px, 7vw, 88px) 0 26px;
}

.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.9fr) minmax(0, 1.3fr);
  gap: clamp(32px, 4vw, 56px);
  padding-bottom: 44px;
  border-bottom: 1px solid var(--indigo);
}

.footer__brand { min-width: 0; }

.footer__name {
  display: inline-block;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--white);
  transition: color var(--dur) var(--ease);
}

.footer__name:hover { color: var(--lime); }

.footer__line {
  margin-top: 12px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.05em;
  color: var(--lime);
}

.footer__note {
  margin-top: 14px;
  max-width: 32ch;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--gray);
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  min-width: 0;
}

.footer__col-title {
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--indigo);
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--orange);
}

.footer__list {
  display: grid;
  gap: 2px;
}

.footer__list a {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: var(--paper);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer__list a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.footer__contact { min-width: 0; }

.footer__contact-list {
  display: grid;
  gap: 14px;
}

.footer__contact-item { min-width: 0; }

.footer__contact-item dt {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.footer__contact-item dd {
  margin: 3px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
  overflow-wrap: anywhere;
}

.footer__contact-item dd .num { font-size: var(--fs-14); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 24px;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--gray);
}

.footer__legal { font-family: var(--font-mono); }

.footer__copy .num { color: var(--gray); }

/* --------------------------------------------------------------------------
   9. 通用按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-align: center;
  border: 2px solid var(--ink);
  background: var(--mist);
  color: var(--ink);
  box-shadow: var(--shadow-hard-sm);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--ink);
}

.btn--primary {
  background: var(--lime);
  color: var(--ink);
}

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

.btn--outline {
  background: transparent;
  color: var(--ink);
}

.btn--ghost {
  background: transparent;
  color: var(---white, #F7FAFF);
  border-color: var(--lime);
  box-shadow: 4px 4px 0 rgba(53, 240, 162, 0.3);
}

.btn--ghost:hover {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--ink);
  box-shadow: 6px 6px 0 rgba(53, 240, 162, 0.45);
}

/* 深色页头内的 CTA 阴影提亮 */
.header-cta { box-shadow: 4px 4px 0 rgba(53, 240, 162, 0.32); }
.header-cta:hover { box-shadow: 6px 6px 0 rgba(53, 240, 162, 0.5); }

/* --------------------------------------------------------------------------
   10. 布局容器
   -------------------------------------------------------------------------- */
.wrap {
  width: min(100% - (var(--edge) * 2), var(--wrap));
  margin-inline: auto;
}

.wrap--narrow {
  width: min(100% - (var(--edge) * 2), var(--narrow));
  margin-inline: auto;
}

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

.section--tight {
  padding-top: clamp(44px, 5vw, 80px);
  padding-bottom: clamp(44px, 5vw, 80px);
}

/* --------------------------------------------------------------------------
   11. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumb {
  padding: 18px 0 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.breadcrumb li { display: flex; align-items: center; gap: 8px; }

.breadcrumb li + li::before {
  content: "/";
  color: var(--orange);
  opacity: 0.85;
}

.breadcrumb a {
  color: inherit;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* --------------------------------------------------------------------------
   12. 响应式图片容器（供页面阶段使用）
   -------------------------------------------------------------------------- */
.frame {
  position: relative;
  display: block;
  overflow: hidden;
  margin: 0;
  background: var(--indigo);
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.frame > img,
.frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.frame--16x9 { aspect-ratio: 16 / 9; }
.frame--4x3  { aspect-ratio: 4 / 3; }
.frame--1x1  { aspect-ratio: 1 / 1; }
.frame--3x4  { aspect-ratio: 3 / 4; }
.frame--21x9 { aspect-ratio: 21 / 9; }

.frame--night {
  border-color: var(--lime);
  box-shadow: 8px 8px 0 rgba(53, 240, 162, 0.22);
}

.frame__caption {
  margin-top: 12px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--gray);
}

/* 扫描线纹理层 */
.frame__scan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(53, 240, 162, 0.06) 0 1px,
    transparent 1px 4px
  );
  mix-blend-mode: screen;
}

/* --------------------------------------------------------------------------
   13. 浅色长文分区辅助
   -------------------------------------------------------------------------- */
.on-light {
  background: var(--mist);
  color: var(--ink);
}

.on-light h1,
.on-light h2,
.on-light h3,
.on-light h4 { color: var(--ink); }

.on-light a { color: var(--ink); }

.on-light strong { color: var(--ink); }

/* --------------------------------------------------------------------------
   14. 响应式
   -------------------------------------------------------------------------- */

/* 移动端：底部数据条让位 */
@media (max-width: 1023px) {
  body { padding-bottom: var(--rail-h); }
}

/* 平板与手机：导航折叠 */
@media (max-width: 900px) {

  .header-nav-row {
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 10px;
    padding: 12px 0 14px;
  }

  .nav-toggle {
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
    display: inline-flex;
  }

  .header-cta {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
    padding: 10px 16px;
    font-size: var(--fs-14);
  }

  .primary-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: stretch;
    display: none;
    width: 100%;
    margin-top: 6px;
    border-top: 1px solid var(--indigo);
  }

  .site-header[data-open] .primary-nav { display: block; }

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

  .primary-nav__list a {
    padding: 14px 12px;
    border-bottom: 1px solid var(--indigo);
    border-left: 3px solid transparent;
  }

  .primary-nav__list a:hover,
  .primary-nav__list a:focus-visible {
    border-left-color: var(--lime);
    background: var(--indigo);
  }

  .primary-nav__list a[aria-current="page"] {
    border-left-color: var(--ink);
  }

  .masthead__sub {
    font-size: 11px;
    letter-spacing: 0.16em;
    text-indent: 0.16em;
    white-space: normal;
  }

  .footer__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .footer__brand { grid-column: 1 / -1; }
}

/* 桌面：左侧固定轮次轴 */
@media (min-width: 1024px) {

  body { padding-left: var(--rail-w); }

  .scroll-meter { left: var(--rail-w); }

  .skip-link { left: calc(var(--rail-w) + 12px); }

  .rail {
    top: 0;
    bottom: 0;
    right: auto;
    width: var(--rail-w);
    height: auto;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 26px;
    padding: 32px 0;
    border-top: 0;
    border-right: 3px solid var(--ink);
    overflow: visible;
  }

  .rail__cap {
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
    font-size: 11px;
  }

  .rail__list {
    flex-direction: column;
    gap: 20px;
  }

  .rail__list::before {
    content: "";
    position: absolute;
    top: -12px;
    bottom: -12px;
    left: 50%;
    width: 2px;
    margin-left: -1px;
    background: var(--night);
  }

  .rail__node {
    position: relative;
    z-index: 1;
    width: 34px;
    height: 34px;
    font-size: var(--fs-12);
  }

  .rail__range {
    writing-mode: vertical-rl;
    letter-spacing: 0.16em;
    padding-left: 0;
    padding-top: 6px;
    border-left: 0;
    border-top: 1px solid rgba(143, 163, 184, 0.35);
    font-size: 11px;
  }
}

/* 手机：页脚单列 */
@media (max-width: 620px) {

  .header-top { padding-top: 20px; }

  .masthead__brand {
    font-size: clamp(30px, 10vw, 42px);
  }

  .nav-toggle__text { display: none; }

  .nav-toggle { padding: 10px 12px; }

  .footer__grid { grid-template-columns: minmax(0, 1fr); }

  .footer__nav { grid-template-columns: minmax(0, 1fr); gap: 26px; }

  .footer__bottom { flex-direction: column; align-items: flex-start; }

  .btn { padding: 12px 18px; }
}

/* --------------------------------------------------------------------------
   15. 降级与无障碍
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .btn:active { transform: none; }
}