/* ==========================================================================
   乐优赛场 · 共享外壳样式 /assets/site.css
   色彩分工：墨绿承载空间，荧光青承载数据与交互，琥珀橙承载结论与快捷入口
   ========================================================================== */

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

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

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, hr {
  margin: 0;
  padding: 0;
}
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; }

:root {
  /* 色彩体系 */
  --ink-900: #05130F;
  --ink-800: #0B1F19;
  --ink-700: #12332A;
  --cyan: #1FE3C0;
  --cyan-bright: #6BF5DC;
  --amber: #FFB020;
  --amber-soft: #FFD98A;
  --text: #E9F4F0;
  --text-dim: #9DBAB2;
  --line: #2C4A42;
  --line-soft: rgba(44, 74, 66, .6);

  /* 尺寸与节奏 */
  --shell-w: 1240px;
  --shell: min(var(--shell-w), 100% - 40px);
  --header-space: 122px;
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 18px;
  --radius-pill: 999px;

  /* 字体 */
  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  /* 动效 */
  --ease: 180ms cubic-bezier(.22, .61, .36, 1);
  --ease-slow: 240ms cubic-bezier(.22, .61, .36, 1);
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(820px 440px at 90% -12%, rgba(31, 227, 192, .10), transparent 70%),
    radial-gradient(640px 400px at 2% 4%, rgba(255, 176, 32, .055), transparent 72%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: .01em;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}
a:hover { color: var(--cyan-bright); }

::selection {
  background: rgba(31, 227, 192, .3);
  color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--cyan-bright);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 跳过链接 ---------- */
.ly-skip {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 90;
  transform: translate(-50%, -220%);
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: #04120E;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  transition: transform var(--ease);
}
.ly-skip:focus,
.ly-skip:focus-visible {
  transform: translate(-50%, 0);
  color: #04120E;
  outline-offset: 4px;
}

/* ---------- 通用容器 ---------- */
.ly-shell {
  width: var(--shell);
  margin-inline: auto;
}

.ly-main {
  display: block;
  padding-top: var(--header-space);
}

.ly-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.ly-panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  padding: clamp(22px, 3.4vw, 40px);
  box-shadow: 0 22px 46px -38px rgba(0, 0, 0, .95);
}

.ly-rule {
  position: relative;
  height: 1px;
  border: 0;
  background: var(--line);
}
.ly-rule::after {
  content: "";
  position: absolute;
  left: 0;
  top: -2px;
  width: 58px;
  height: 5px;
  background: var(--cyan);
  transform: skewX(-24deg);
}

/* ---------- 章节头 ---------- */
.ly-sechead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: 28px;
}
.ly-sechead__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--amber);
}
.ly-sechead__title {
  font-size: clamp(26px, 3.4vw, 44px);
  color: var(--text);
}
.ly-sechead__sub {
  margin-left: auto;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 文本 ---------- */
.ly-lead {
  max-width: 42ch;
  font-size: clamp(16px, 1.3vw, 19px);
  line-height: 1.85;
  color: var(--text-dim);
}

.ly-mark {
  color: var(--text);
  font-weight: 700;
  padding: 0 2px;
  background-image: linear-gradient(transparent 62%, rgba(255, 176, 32, .42) 62%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

/* ---------- 数字 ---------- */
.ly-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: -.02em;
}
.ly-num--xl {
  display: block;
  font-size: clamp(56px, 9vw, 88px);
  line-height: .92;
  color: var(--amber);
}

/* ---------- 标签胶囊 ---------- */
.ly-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(18, 51, 42, .5);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--text-dim);
}
.ly-tag--cyan {
  border-color: rgba(31, 227, 192, .42);
  background: rgba(31, 227, 192, .08);
  color: var(--cyan);
}
.ly-tag--amber {
  border-color: rgba(255, 176, 32, .5);
  background: rgba(255, 176, 32, .1);
  color: var(--amber-soft);
}

/* ---------- 按钮 ---------- */
.ly-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .05em;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease), background-color 200ms cubic-bezier(.22, .61, .36, 1);
}
.ly-btn:hover {
  border-color: var(--cyan);
  background: rgba(31, 227, 192, .08);
  color: var(--cyan-bright);
}
.ly-btn--solid {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04120E;
}
.ly-btn--solid:hover {
  background: var(--cyan-bright);
  border-color: var(--cyan-bright);
  color: #04120E;
}
.ly-btn--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: #1A1204;
}
.ly-btn--amber:hover {
  background: var(--amber-soft);
  border-color: var(--amber-soft);
  color: #1A1204;
}

/* ---------- 面包屑 ---------- */
.ly-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--text-dim);
}
.ly-crumb a { color: var(--text-dim); }
.ly-crumb a:hover { color: var(--cyan-bright); }
.ly-crumb__sep { color: var(--line); }
.ly-crumb [aria-current="page"] { color: var(--text); }

/* ---------- 图片容器基础规则 ---------- */
.ly-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-800);
}
.ly-media > img,
.ly-media > picture,
.ly-media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ly-media--wide { aspect-ratio: 21 / 9; }
.ly-media--tall { aspect-ratio: 4 / 5; }
.ly-media--square { aspect-ratio: 1 / 1; }
.ly-media__cap {
  position: absolute;
  inset: auto 0 0 0;
  padding: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
  background: linear-gradient(180deg, rgba(5, 19, 15, 0), rgba(5, 19, 15, .92));
}

/* ---------- 折叠面板 ---------- */
.ly-fold {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-800);
  overflow: hidden;
}
.ly-fold + .ly-fold { margin-top: 10px; }
.ly-fold summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--text);
  transition: background-color var(--ease), color var(--ease);
}
.ly-fold summary::-webkit-details-marker { display: none; }
.ly-fold summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
}
.ly-fold[open] summary::after { content: "–"; }
.ly-fold summary:hover { background: rgba(31, 227, 192, .06); }
.ly-fold[open] summary { border-bottom: 1px solid var(--line); }
.ly-fold__body {
  padding: 18px 20px 22px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
  transition: opacity var(--ease-slow);
}

/* ---------- 入场确认 ---------- */
[data-reveal] {
  transition: opacity 360ms ease, transform 360ms ease;
}
html[data-motion="on"] [data-reveal]:not(.is-in) {
  opacity: 0;
  transform: translateY(4px);
}

/* ==========================================================================
   悬浮头部
   ========================================================================== */
.ly-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding: 16px 0 10px;
  font-size: 14px;
}
.ly-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 19, 15, .92), rgba(5, 19, 15, .5) 58%, rgba(5, 19, 15, 0));
}

.ly-header__rail {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* 品牌浮岛 */
.ly-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 9px 20px 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(18, 51, 42, .74);
  color: var(--text);
  transition: border-color var(--ease), background-color var(--ease);
}
.ly-brand:hover {
  border-color: var(--cyan);
  background: rgba(18, 51, 42, .95);
  color: var(--text);
}
.ly-brand__mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 22px;
}
.ly-brand__mark span {
  display: block;
  width: 4px;
  border-radius: 2px;
  background: var(--cyan);
}
.ly-brand__mark span:nth-child(1) { height: 10px; opacity: .5; }
.ly-brand__mark span:nth-child(2) { height: 16px; opacity: .8; }
.ly-brand__mark span:nth-child(3) { height: 22px; background: var(--amber); }
.ly-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.ly-brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .08em;
}
.ly-brand__claim {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--text-dim);
}

/* 移动导航按钮 */
.ly-navtoggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(18, 51, 42, .82);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .08em;
  cursor: pointer;
  transition: border-color var(--ease), background-color var(--ease);
}
.ly-navtoggle:hover {
  border-color: var(--cyan);
  background: rgba(31, 227, 192, .1);
}
.ly-navtoggle__icon {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}
.ly-navtoggle__icon span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform var(--ease), opacity var(--ease);
}
.ly-navtoggle[aria-expanded="true"] .ly-navtoggle__icon span:first-child {
  transform: translateY(3px) rotate(45deg);
}
.ly-navtoggle[aria-expanded="true"] .ly-navtoggle__icon span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

/* 导航胶囊 */
.ly-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(11, 31, 25, .8);
}
.ly-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.ly-nav__list a {
  display: block;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--text-dim);
  font-size: 14px;
  letter-spacing: .04em;
  white-space: nowrap;
  transition: color var(--ease), background-color var(--ease), border-color var(--ease);
}
.ly-nav__list a:hover {
  color: var(--text);
  background: rgba(31, 227, 192, .1);
}
.ly-nav__list a[aria-current="page"] {
  color: var(--cyan-bright);
  background: rgba(31, 227, 192, .12);
  border-color: rgba(31, 227, 192, .42);
}
.ly-nav__cue {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 6px;
  padding: 9px 18px;
  border: 1px solid var(--amber);
  border-radius: var(--radius-pill);
  background: var(--amber);
  color: #1A1204;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: background-color 200ms cubic-bezier(.22, .61, .36, 1), border-color var(--ease);
}
.ly-nav__cue::after {
  content: "›";
  font-family: var(--font-mono);
  font-size: 15px;
}
.ly-nav__cue:hover {
  background: var(--amber-soft);
  border-color: var(--amber-soft);
  color: #1A1204;
}

/* 收缩态 */
.ly-header[data-condensed="true"] { padding-top: 10px; }
.ly-header[data-condensed="true"] .ly-brand__claim { display: none; }
.ly-header[data-condensed="true"] .ly-brand { padding: 8px 18px 8px 12px; }
.ly-header[data-condensed="true"] .ly-nav__list a { padding: 7px 11px; font-size: 13px; }
.ly-header[data-condensed="true"] .ly-nav__cue { padding: 8px 15px; font-size: 13px; }

/* 滚动进度 */
.ly-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  height: 2px;
  pointer-events: none;
  background: rgba(44, 74, 66, .5);
}
.ly-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

/* ==========================================================================
   页脚
   ========================================================================== */
.ly-footer {
  margin-top: 120px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 31, 25, .5), rgba(5, 19, 15, .96));
  font-size: 14px;
  color: var(--text-dim);
}
.ly-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.1fr 1.3fr;
  gap: 40px;
  padding-top: 72px;
  padding-bottom: 56px;
}
.ly-footer__col { min-width: 0; }

.ly-footer__brand {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: .1em;
  color: var(--text);
  line-height: 1.2;
}
.ly-footer__note {
  margin-top: 12px;
  max-width: 30ch;
  line-height: 1.8;
  color: var(--text-dim);
}
.ly-footer__meta {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--cyan);
}

.ly-footer__title {
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .24em;
  color: var(--amber-soft);
}

.ly-footer__list {
  display: grid;
  gap: 10px;
}
.ly-footer__list a {
  color: var(--text-dim);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.ly-footer__list a:hover {
  color: var(--cyan-bright);
  border-bottom-color: var(--cyan);
}

.ly-footer__contact {
  display: grid;
  gap: 12px;
}
.ly-footer__contact li {
  display: grid;
  gap: 3px;
}
.ly-footer__k {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--text-dim);
  opacity: .8;
}
.ly-footer__v {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
  word-break: break-word;
}
.ly-footer__hint {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* 通勤摘要条 */
.ly-footer__ticker {
  border-top: 1px solid var(--line);
  background: rgba(18, 51, 42, .5);
}
.ly-footer__tickerinner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  padding-top: 16px;
  padding-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-dim);
}
.ly-tick {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
}
.ly-tick b {
  font-size: 16px;
  font-weight: 600;
  color: var(--amber);
}
.ly-tick--end { margin-left: auto; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .ly-nav__list a { padding: 8px 11px; font-size: 13px; }
  .ly-nav__cue { padding: 9px 15px; font-size: 13px; }
  .ly-footer__grid { grid-template-columns: 1.3fr 1fr 1fr; }
  .ly-footer__col:last-child { grid-column: 1 / -1; }
  .ly-footer__contact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  :root { --header-space: 108px; }

  .ly-navtoggle { display: inline-flex; }

  .ly-nav {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    width: min(300px, calc(100vw - 40px));
    padding: 14px;
    border-radius: 20px;
    background: rgba(11, 31, 25, .98);
    box-shadow: 0 26px 60px rgba(0, 0, 0, .55);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
  }
  .ly-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .ly-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .ly-nav__list a {
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 15px;
  }
  .ly-nav__cue {
    justify-content: center;
    margin: 10px 0 0;
    padding: 12px 18px;
    border-radius: 12px;
    font-size: 15px;
  }

  .ly-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .ly-footer { margin-top: 88px; }
  .ly-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding-top: 56px;
    padding-bottom: 40px;
  }
  .ly-footer__col:first-child { grid-column: 1 / -1; }
  .ly-footer__col:last-child { grid-column: 1 / -1; }
  .ly-footer__contact { grid-template-columns: 1fr; }
  .ly-sechead__sub { margin-left: 0; }
}

@media (max-width: 640px) {
  :root { --shell: min(var(--shell-w), 100% - 28px); }

  body { font-size: 16px; line-height: 1.8; }

  .ly-header { padding-top: 12px; }
  .ly-brand { padding: 8px 16px 8px 12px; }
  .ly-brand__name { font-size: 17px; }
  .ly-brand__claim { display: none; }
  .ly-navtoggle__text { display: none; }

  .ly-footer__grid { grid-template-columns: 1fr; }
  .ly-footer__brand { font-size: 22px; }
  .ly-footer__tickerinner { gap: 8px 18px; }
  .ly-tick--end {
    margin-left: 0;
    width: 100%;
    padding-top: 8px;
    border-top: 1px solid var(--line-soft);
  }
  .ly-media--wide { aspect-ratio: 16 / 9; }
}

/* ==========================================================================
   动效降级
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html[data-motion="on"] [data-reveal]:not(.is-in) {
    opacity: 1;
    transform: none;
  }
}