/* ===========================================================
   完美体育 · 共享样式表  /assets/site.css
   设计语言：技术蓝图网格 · 切角资料卡 · 蓝色底 + 橙色信号 + 荧光轨迹
   =========================================================== */

:root {
  --bp-900: #05121F;
  --bp-800: #0A1D33;
  --bp-700: #10294D;
  --navy-line: #1D3E6B;
  --orange: #FF6B1A;
  --orange-soft: #FF9A57;
  --lime: #C7FF4F;
  --paper: #F2F6FB;
  --ink: #16202E;
  --mist: #9FB3C8;
  --slate: #56657A;
  --white: #FFFFFF;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, "Courier New", monospace;

  --cut: 12px;
  --maxw: 1360px;
  --pad: clamp(16px, 4vw, 40px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --grid-step: 32px;
}

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

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

body {
  margin: 0;
  background-color: var(--bp-900);
  background-image:
    linear-gradient(to right, rgba(29, 62, 107, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 62, 107, 0.22) 1px, transparent 1px);
  background-size: var(--grid-step) var(--grid-step);
  color: var(--white);
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

@media (min-width: 1024px) {
  body { font-size: 17px; }
}

h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; }
table { border-collapse: collapse; width: 100%; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 1px;
}

::selection {
  background: var(--orange);
  color: var(--bp-900);
}

#main-content { scroll-margin-top: 132px; }

/* ---------- 排版工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.04em;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

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

.g-4  { grid-column: span 4; }
.g-5  { grid-column: span 5; }
.g-6  { grid-column: span 6; }
.g-7  { grid-column: span 7; }
.g-8  { grid-column: span 8; }
.g-9  { grid-column: span 9; }
.g-11 { grid-column: span 11; }
.g-12 { grid-column: span 12; }
.g-16 { grid-column: span 16; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 300;
  padding: 11px 18px;
  background: var(--orange);
  color: #06121F;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 14px; }

/* ===========================================================
   页头：双层档案脊
   =========================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(5, 18, 31, 0.95);
  border-bottom: 1px solid var(--navy-line);
}

.site-header::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--orange) 0%,
    var(--orange) 14%,
    var(--navy-line) 14%,
    var(--navy-line) 100%
  );
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: var(--scroll-progress, 0%);
  background: linear-gradient(90deg, var(--orange), var(--lime));
  pointer-events: none;
  z-index: 2;
  transition: width 0.1s linear;
}

.header-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.header-top {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.4vw, 32px);
  min-height: 62px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--white);
  flex: 0 0 auto;
}

.brand-mark__name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.07em;
}

.brand-mark__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--orange);
  border-left: 2px solid var(--orange);
  padding-left: 9px;
}

.header-tagline {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  flex: 0 1 auto;
}

.header-marker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
  flex: 0 0 auto;
}

.marker-dot {
  width: 6px;
  height: 6px;
  background: var(--lime);
  box-shadow: 0 0 8px rgba(199, 255, 79, 0.7);
  flex: 0 0 auto;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--navy-line);
  color: var(--white);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.nav-toggle:hover { border-color: var(--orange); }
.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}
.nav-toggle__icon {
  width: 16px;
  height: 12px;
  background-image:
    linear-gradient(var(--orange), var(--orange)),
    linear-gradient(var(--orange), var(--orange)),
    linear-gradient(var(--orange), var(--orange));
  background-repeat: no-repeat;
  background-size: 100% 2px, 100% 2px, 64% 2px;
  background-position: 0 0, 0 5px, 0 10px;
  transition: background-size 0.24s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon {
  background-size: 100% 2px, 100% 2px, 100% 2px;
}

/* 下层栏目索引 */
.site-nav { display: block; }

.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 44px);
  min-height: 46px;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 13px 0;
  color: var(--mist);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 7px;
  height: 2px;
  background: var(--orange);
  transition: right 0.3s var(--ease);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
  transition: color 0.22s var(--ease);
}

.site-nav__link:hover { color: var(--white); }
.site-nav__link:hover::after { right: 0; }
.site-nav__link:hover .site-nav__index { color: var(--orange-soft); }

.site-nav__link[aria-current="page"] { color: var(--white); }
.site-nav__link[aria-current="page"]::after { right: 0; }
.site-nav__link[aria-current="page"] .site-nav__index { color: var(--orange); }

/* ===========================================================
   页脚：档案柜底层
   =========================================================== */
.site-footer {
  margin-top: clamp(56px, 8vw, 104px);
  padding: clamp(40px, 6vw, 72px) 0 28px;
  background:
    linear-gradient(180deg, rgba(16, 41, 77, 0.55), rgba(3, 11, 20, 0) 240px),
    #030B14;
  border-top: 1px solid var(--navy-line);
  color: var(--mist);
  font-size: 14px;
}

.footer-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.footer-head {
  display: grid;
  grid-template-columns: minmax(240px, 5fr) 7fr;
  gap: clamp(28px, 5vw, 64px);
  padding-bottom: 34px;
  border-bottom: 1px solid var(--navy-line);
}

.footer-brand__name {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--white);
  margin-bottom: 8px;
}

.footer-brand__line {
  font-size: 13px;
  line-height: 1.9;
  color: var(--slate);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--navy-line);
}

.footer-list__item { margin-bottom: 4px; }

.footer-list__link {
  display: inline-block;
  padding: 4px 0;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease), padding-left 0.24s var(--ease);
}
.footer-list__link:hover {
  color: var(--orange);
  padding-left: 6px;
}

.footer-contact {
  padding: 24px 0;
  border-bottom: 1px solid var(--navy-line);
}

.footer-contact__line {
  font-size: 13px;
  line-height: 2;
  color: var(--mist);
}

.footer-contact__line .mono {
  color: var(--white);
  font-size: 12.5px;
}

.footer-contact__note {
  margin-top: 6px;
  font-size: 12px;
  color: var(--slate);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px 32px;
  padding-top: 22px;
}

.footer-bottom__line {
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 62ch;
}

.footer-bottom__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
  white-space: nowrap;
}
.footer-bottom__meta .mono { color: var(--slate); }

/* ===========================================================
   通用组件
   =========================================================== */
.section-head {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: clamp(14px, 2vw, 28px);
  align-items: start;
  padding-top: 18px;
  margin-bottom: clamp(24px, 3vw, 42px);
  border-top: 1px solid var(--navy-line);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
  padding-top: 6px;
}

.section-head__title {
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
}

.section-head__note {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
}

/* 切角面板 */
.panel {
  position: relative;
  background: var(--bp-800);
  padding: clamp(18px, 2.4vw, 28px);
  box-shadow: inset 0 0 0 1px var(--navy-line);
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

.panel--flat { background: var(--bp-700); }

.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.panel__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
  border: 1px solid rgba(255, 107, 26, 0.42);
  padding: 3px 9px;
}

.panel__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

/* 数字指标 */
.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  font-weight: 500;
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.stat__unit {
  font-size: 0.42em;
  letter-spacing: 0.12em;
  color: var(--mist);
  margin-left: 0.35em;
}

.stat__label {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.stat--lime .stat__value { color: var(--lime); }
.stat--plain .stat__value { color: var(--white); }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--navy-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  white-space: nowrap;
}

.tag--hot {
  border-color: rgba(199, 255, 79, 0.6);
  color: var(--lime);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid var(--navy-line);
  background: transparent;
  color: var(--white);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease), color 0.24s var(--ease);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #06121F;
  font-weight: 700;
}
.btn--primary:hover {
  background: var(--orange-soft);
  border-color: var(--orange-soft);
}

.btn--ghost:hover {
  border-color: var(--orange);
  color: var(--orange);
}

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

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.breadcrumb__item::after {
  content: "/";
  margin-left: 10px;
  color: var(--navy-line);
}
.breadcrumb__item:last-child::after { content: none; }

.breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.breadcrumb__link:hover { color: var(--orange); }

/* 浅色长文分区 */
.prose {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(28px, 5vw, 64px) 0;
}

.prose h2 {
  font-size: clamp(1.3rem, 2.4vw, 1.85rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}

.prose h3 {
  font-size: 1.08rem;
  font-weight: 600;
  margin: 30px 0 10px;
}

.prose p {
  max-width: 42em;
  font-size: 16.5px;
  line-height: 1.85;
  color: #22303F;
  margin-bottom: 16px;
}

.prose ul,
.prose ol {
  max-width: 42em;
  margin: 0 0 18px;
  padding-left: 1.2em;
  list-style: disc;
  color: #22303F;
}
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 8px; line-height: 1.85; }

.prose .mono { color: var(--slate); }

.prose__note {
  display: block;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid #D2DCE9;
  font-size: 13px;
  line-height: 1.9;
  color: var(--slate);
  max-width: 52em;
}

/* 图片容器 */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--bp-700);
  border: 1px solid var(--navy-line);
  aspect-ratio: 16 / 9;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame--empty::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(29, 62, 107, 0.55) 0,
    rgba(29, 62, 107, 0.55) 1px,
    transparent 1px,
    transparent 12px
  );
}

.media-frame__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

/* 显现动效协议 */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 0.42s var(--ease),
    transform 0.42s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

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

/* ===========================================================
   响应式
   =========================================================== */
@media (max-width: 1024px) {
  .footer-head { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .header-top {
    flex-wrap: wrap;
    align-items: center;
    gap: 2px 12px;
    min-height: 0;
    padding: 11px 0 12px;
  }

  .brand-mark { order: 1; }

  .nav-toggle { display: inline-flex; order: 2; margin-left: auto; }

  .header-tagline {
    order: 3;
    flex-basis: 100%;
    font-size: 11.5px;
    letter-spacing: 0.04em;
  }

  .header-marker { display: none; }

  .site-nav { display: none; }

  .site-nav[data-open] {
    display: block;
    padding-bottom: 6px;
  }

  .site-nav[data-open] .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    min-height: 0;
    border-top: 1px solid var(--navy-line);
  }

  .site-nav[data-open] .site-nav__link {
    width: 100%;
    padding: 15px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--navy-line);
  }

  .site-nav[data-open] .site-nav__link::after {
    bottom: 0;
    height: 1px;
  }

  #main-content { scroll-margin-top: 108px; }

  .g-4, .g-5, .g-6, .g-7, .g-8, .g-9, .g-11, .g-12, .g-16 {
    grid-column: 1 / -1;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .section-head__index { padding-top: 0; }
}

@media (max-width: 640px) {
  .footer-nav { grid-template-columns: 1fr 1fr; gap: 22px; }

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

  .footer-bottom__meta { white-space: normal; }

  .footer-contact__line { font-size: 12.5px; }
}

@media (max-width: 420px) {
  .footer-nav { grid-template-columns: 1fr; }
  .brand-mark__sub { display: none; }
}

/* ===========================================================
   动效降级
   =========================================================== */
@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;
  }

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

  .site-header::after { transition: none; }
  .media-frame img { transition: none; }
}