/* =========================================================
   亚体育主站 · 共享站点样式 /assets/site.css
   深墨绿底座 + 技术蓝图网格 + 玻璃层 / 实色层并置
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--sy-header-h, 72px) + 16px);
}

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

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

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

button { font: inherit; color: inherit; }

:root {
  /* 色彩 */
  --sy-ink: #061A15;
  --sy-charcoal: #0A0D0C;
  --sy-glass: #12352D;
  --sy-steel: #26312E;
  --sy-silver: #AEB8B3;
  --sy-lime: #B8FF3F;
  --sy-orange: #FF5A1F;
  --sy-paper: #F3F0E7;
  --sy-mint: #D9F7E4;

  --sy-line: rgba(174, 184, 179, 0.22);
  --sy-line-strong: rgba(174, 184, 179, 0.42);
  --sy-on-dark: rgba(243, 240, 231, 0.82);
  --sy-on-dark-soft: rgba(174, 184, 179, 0.78);

  /* 字体 */
  --sy-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --sy-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --sy-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 尺寸 */
  --sy-w: 1320px;
  --sy-gutter: clamp(18px, 4vw, 56px);
  --sy-header-h: 72px;
  --sy-radius: 2px;
  --sy-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (max-width: 600px) {
  :root { --sy-header-h: 64px; }
}

/* ---------- 基础排版 ---------- */
body {
  min-height: 100%;
  padding-top: var(--sy-header-h);
  background-color: var(--sy-ink);
  background-image:
    linear-gradient(180deg, #061A15 0%, #061A15 62%, #05130F 100%);
  color: var(--sy-paper);
  font-family: var(--sy-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
}

body.sy-nav-open { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--sy-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--sy-paper);
}

p { text-wrap: pretty; }

a { color: inherit; }

:where(a, button, [tabindex], summary):focus-visible {
  outline: 2px solid var(--sy-lime);
  outline-offset: 3px;
  border-radius: var(--sy-radius);
}

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

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 12px;
  z-index: 400;
  display: inline-block;
  padding: 12px 18px;
  background: var(--sy-lime);
  color: var(--sy-charcoal);
  font: 600 14px/1 var(--sy-body);
  text-decoration: none;
  border-radius: var(--sy-radius);
  transition: top 0.2s var(--sy-ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 头部 ---------- */
.sy-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  height: var(--sy-header-h);
  background: linear-gradient(180deg, rgba(6, 26, 21, 0.82) 0%, rgba(6, 26, 21, 0.16) 78%, rgba(6, 26, 21, 0) 100%);
  border-bottom: 1px solid transparent;
  transition: background 0.28s var(--sy-ease),
              border-color 0.28s var(--sy-ease),
              backdrop-filter 0.28s var(--sy-ease);
}

.sy-header[data-scrolled="true"] {
  background: rgba(10, 13, 12, 0.94);
  border-bottom-color: var(--sy-line);
  backdrop-filter: blur(12px) saturate(1.1);
  -webkit-backdrop-filter: blur(12px) saturate(1.1);
}

.sy-header__inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  width: 100%;
  max-width: var(--sy-w);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--sy-gutter);
}

/* 品牌 */
.sy-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--sy-paper);
}

.sy-brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border: 1.5px solid var(--sy-lime);
  border-radius: var(--sy-radius);
  background:
    linear-gradient(135deg, rgba(184, 255, 63, 0.18), rgba(18, 53, 45, 0.1));
  transition: transform 0.25s var(--sy-ease), box-shadow 0.25s var(--sy-ease);
}

.sy-brand__mark::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(174, 184, 179, 0.7);
  border-radius: 1px;
}

.sy-brand__mark::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 8px;
  height: 8px;
  background: var(--sy-orange);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.sy-brand__mark--lg { width: 36px; height: 36px; }
.sy-brand__mark--lg::before { inset: 7px; }
.sy-brand__mark--lg::after { width: 11px; height: 11px; }

.sy-brand:hover .sy-brand__mark {
  transform: translateY(-1px);
  box-shadow: 0 0 0 3px rgba(184, 255, 63, 0.16);
}

.sy-brand__text {
  display: grid;
  gap: 2px;
}

.sy-brand__name {
  font-family: var(--sy-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--sy-paper);
}

.sy-brand__tag {
  font: 500 10px/1 var(--sy-mono);
  letter-spacing: 0.16em;
  color: var(--sy-on-dark-soft);
  text-transform: uppercase;
  white-space: nowrap;
}

/* 主导航 */
.sy-nav {
  display: flex;
  justify-content: center;
  min-width: 0;
}

.sy-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.9vw, 12px);
}

.sy-nav__item { position: relative; }

.sy-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 9px 10px 10px;
  color: var(--sy-on-dark);
  font-size: 14px;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--sy-ease);
}

.sy-nav__index {
  font: 500 10px/1 var(--sy-mono);
  letter-spacing: 0.16em;
  color: rgba(174, 184, 179, 0.66);
  transition: color 0.2s var(--sy-ease);
}

.sy-nav__label { display: inline-block; }

.sy-nav__link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 2px;
  background: var(--sy-lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--sy-ease);
}

.sy-nav__link:hover { color: var(--sy-paper); }
.sy-nav__link:hover .sy-nav__index { color: var(--sy-lime); }
.sy-nav__link:hover::after { transform: scaleX(1); background: rgba(174, 184, 179, 0.55); }

.sy-nav__link[aria-current="page"] { color: var(--sy-lime); }
.sy-nav__link[aria-current="page"] .sy-nav__index { color: var(--sy-lime); }
.sy-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--sy-lime);
}

/* 移动索引层底部入口（桌面隐藏） */
.sy-nav__foot { display: none; }

/* 头部操作区 */
.sy-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 按钮 */
.sy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--sy-radius);
  font-family: var(--sy-body);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s var(--sy-ease),
              color 0.2s var(--sy-ease),
              border-color 0.2s var(--sy-ease),
              box-shadow 0.2s var(--sy-ease),
              transform 0.2s var(--sy-ease);
}

.sy-btn--accent {
  background: var(--sy-lime);
  border-color: var(--sy-lime);
  color: var(--sy-charcoal);
}
.sy-btn--accent:hover {
  background: #c6ff60;
  border-color: #c6ff60;
  box-shadow: 0 0 0 4px rgba(184, 255, 63, 0.16);
}

.sy-btn--ghost {
  background: rgba(18, 53, 45, 0.42);
  border-color: rgba(174, 184, 179, 0.34);
  color: var(--sy-paper);
}
.sy-btn--ghost:hover {
  border-color: var(--sy-lime);
  color: var(--sy-lime);
  background: rgba(18, 53, 45, 0.66);
}

.sy-btn--sm {
  padding: 9px 13px;
  font-size: 13px;
}

/* 移动索引开关 */
.sy-nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  background: rgba(18, 53, 45, 0.5);
  border: 1px solid rgba(174, 184, 179, 0.34);
  border-radius: var(--sy-radius);
  color: var(--sy-paper);
  cursor: pointer;
  transition: border-color 0.2s var(--sy-ease), color 0.2s var(--sy-ease);
}

.sy-nav-toggle:hover { border-color: var(--sy-lime); color: var(--sy-lime); }

.sy-nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.sy-nav-toggle__bars > span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.22s var(--sy-ease), opacity 0.22s var(--sy-ease);
}

.sy-nav-toggle__label {
  font: 500 11px/1 var(--sy-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.sy-header[data-open="true"] .sy-nav-toggle {
  border-color: var(--sy-lime);
  color: var(--sy-lime);
}
.sy-header[data-open="true"] .sy-nav-toggle__bars > span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.sy-header[data-open="true"] .sy-nav-toggle__bars > span:nth-child(2) {
  opacity: 0;
}
.sy-header[data-open="true"] .sy-nav-toggle__bars > span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* 阅读进度 */
.sy-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(174, 184, 179, 0.14);
  overflow: hidden;
}

.sy-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--sy-lime) 0%, var(--sy-lime) 62%, var(--sy-orange) 100%);
  transition: width 0.12s linear;
}

/* ---------- 页脚 ---------- */
.sy-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--sy-charcoal);
  border-top: 1px solid var(--sy-line-strong);
  color: var(--sy-silver);
  overflow: hidden;
}

.sy-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(174, 184, 179, 0.16) 1px, transparent 1px),
    linear-gradient(180deg, rgba(174, 184, 179, 0.16) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.32;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 60%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 60%, transparent 100%);
}

.sy-footer > .sy-container { position: relative; z-index: 1; }

.sy-footer__top {
  display: grid;
  grid-template-columns: minmax(200px, 0.95fr) minmax(0, 1.65fr);
  gap: clamp(24px, 4vw, 64px);
  padding-block: clamp(34px, 5vw, 62px) clamp(24px, 3vw, 36px);
}

.sy-footer__brand {
  display: grid;
  gap: 12px;
  align-content: start;
}

.sy-footer__brand-line {
  font-family: var(--sy-display);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--sy-paper);
}

.sy-footer__brand-note {
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(174, 184, 179, 0.8);
}

.sy-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 40px);
}

.sy-footer__col { min-width: 0; }

.sy-footer__col-title {
  margin-bottom: 14px;
  font-family: var(--sy-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sy-lime);
}

.sy-footer__links {
  display: grid;
  gap: 9px;
}

.sy-footer__link {
  display: inline-block;
  padding: 2px 0;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(243, 240, 231, 0.8);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--sy-ease),
              border-color 0.2s var(--sy-ease),
              padding-left 0.2s var(--sy-ease);
}

.sy-footer__link:hover {
  color: var(--sy-lime);
  border-bottom-color: rgba(184, 255, 63, 0.5);
  padding-left: 4px;
}

.sy-footer__contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 32px);
  padding-block: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--sy-line);
  border-bottom: 1px solid var(--sy-line);
}

.sy-contact-item {
  display: grid;
  gap: 6px;
  align-content: start;
}

.sy-contact-item__label {
  font-family: var(--sy-mono);
  font-size: 10px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(174, 184, 179, 0.72);
}

.sy-contact-item__value {
  font-size: 14px;
  line-height: 1.6;
  color: var(--sy-paper);
  word-break: break-word;
}

.sy-footer__service {
  padding-top: 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(174, 184, 179, 0.72);
}

.sy-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: clamp(16px, 2.4vw, 26px);
}

.sy-footer__legal {
  font-family: var(--sy-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: rgba(174, 184, 179, 0.74);
}

.sy-footer__copy {
  font-size: 12px;
  line-height: 1.6;
  color: rgba(174, 184, 179, 0.68);
}

/* ---------- 通用布局 ---------- */
.sy-container {
  width: 100%;
  max-width: var(--sy-w);
  margin-inline: auto;
  padding-inline: var(--sy-gutter);
}

.sy-hero-bleed { margin-top: calc(var(--sy-header-h) * -1); }

.sy-section {
  position: relative;
  padding-block: clamp(42px, 6vw, 88px);
}

.sy-section__num {
  display: inline-block;
  font-family: var(--sy-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.16em;
  color: var(--sy-lime);
}

.sy-section__title {
  margin-top: 12px;
  font-family: var(--sy-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 40px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--sy-paper);
}

.sy-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--sy-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--sy-lime);
}
.sy-eyebrow::before {
  content: "";
  width: 20px;
  height: 1px;
  background: currentColor;
}

.sy-display {
  font-family: var(--sy-display);
  font-weight: 800;
  font-size: clamp(33px, 6vw, 64px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--sy-paper);
}

.sy-lead {
  max-width: 62ch;
  font-size: clamp(16px, 1.4vw, 20px);
  line-height: 1.72;
  color: var(--sy-on-dark);
}

.sy-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 1.7vw, 24px);
}

/* ---------- 卡片与面板 ---------- */
.sy-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: rgba(18, 53, 45, 0.5);
  border: 1px solid var(--sy-line);
  border-radius: var(--sy-radius);
  transition: transform 0.24s var(--sy-ease),
              border-color 0.24s var(--sy-ease),
              box-shadow 0.24s var(--sy-ease);
}

.sy-card:hover {
  transform: translateY(-3px);
  border-color: rgba(184, 255, 63, 0.42);
  box-shadow: 0 14px 30px -18px rgba(0, 0, 0, 0.9),
              inset 0 0 0 1px rgba(184, 255, 63, 0.1);
}

.sy-card--glass {
  background: linear-gradient(152deg, rgba(18, 53, 45, 0.78) 0%, rgba(10, 13, 12, 0.66) 100%);
  backdrop-filter: blur(9px);
  -webkit-backdrop-filter: blur(9px);
}

.sy-panel {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: linear-gradient(160deg, rgba(18, 53, 45, 0.84) 0%, rgba(10, 13, 12, 0.92) 100%);
  border: 1px solid var(--sy-line);
  border-radius: var(--sy-radius);
}

/* ---------- 标签 ---------- */
.sy-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 9px;
  border: 1px solid rgba(174, 184, 179, 0.34);
  border-radius: var(--sy-radius);
  font-family: var(--sy-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sy-silver);
}

.sy-tag--lime {
  border-color: rgba(184, 255, 63, 0.5);
  background: rgba(184, 255, 63, 0.09);
  color: var(--sy-lime);
}

.sy-tag--orange {
  border-color: rgba(255, 90, 31, 0.52);
  background: rgba(255, 90, 31, 0.1);
  color: var(--sy-orange);
}

/* ---------- 图片容器（页面阶段放入 img.sy-media__img） ---------- */
.sy-media {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, #0B2521 0%, #12352D 62%, #0D2A24 100%);
  border: 1px solid var(--sy-line);
  border-radius: var(--sy-radius);
}

.sy-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(174, 184, 179, 0.22) 1px, transparent 1px),
    linear-gradient(180deg, rgba(174, 184, 179, 0.22) 1px, transparent 1px);
  background-size: 30px 30px;
  mix-blend-mode: screen;
  opacity: 0.3;
}

.sy-media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.sy-media--16x9 { aspect-ratio: 16 / 9; }
.sy-media--4x5 { aspect-ratio: 4 / 5; }
.sy-media--1x1 { aspect-ratio: 1 / 1; }

/* ---------- 面包屑 ---------- */
.sy-breadcrumb { padding-top: clamp(16px, 2.4vw, 28px); }

.sy-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
  font-family: var(--sy-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(174, 184, 179, 0.78);
}

.sy-breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.sy-breadcrumb__item + .sy-breadcrumb__item::before {
  content: "/";
  color: rgba(174, 184, 179, 0.45);
}

.sy-breadcrumb__link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--sy-ease), border-color 0.2s var(--sy-ease);
}

.sy-breadcrumb__link:hover {
  color: var(--sy-lime);
  border-bottom-color: var(--sy-lime);
}

/* ---------- 浅色阅读区 ---------- */
.sy-sheet {
  padding-block: clamp(30px, 4.4vw, 64px);
  background: var(--sy-paper);
  color: #121A16;
}

.sy-sheet h2,
.sy-sheet h3 { color: #0B231B; }

.sy-sheet a {
  color: #0F3A2E;
  text-decoration: underline;
  text-decoration-color: rgba(15, 58, 46, 0.4);
  text-underline-offset: 3px;
}
.sy-sheet a:hover { color: #B44A14; }

/* ---------- 显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.45s var(--sy-ease), transform 0.45s var(--sy-ease);
}

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

/* ---------- 响应式：平板与手机 ---------- */
@media (max-width: 1180px) {
  .sy-nav__link { padding-inline: 7px; font-size: 13.5px; }
  .sy-brand__tag { display: none; }
}

@media (max-width: 1000px) {
  .sy-nav-toggle { display: inline-flex; }
  .sy-header__actions .sy-btn { display: none; }

  .sy-nav {
    position: fixed;
    top: var(--sy-header-h);
    left: 0;
    right: 0;
    bottom: 0;
    display: block;
    padding: clamp(16px, 4vw, 28px) var(--sy-gutter) calc(var(--sy-header-h) + 28px);
    overflow-y: auto;
    background:
      radial-gradient(120% 80% at 100% 0%, rgba(18, 53, 45, 0.96) 0%, rgba(6, 26, 21, 0.99) 62%);
    border-top: 1px solid var(--sy-line);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.24s var(--sy-ease),
                transform 0.24s var(--sy-ease),
                visibility 0.24s var(--sy-ease);
  }

  .sy-header[data-open="true"] .sy-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

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

  .sy-nav__item { border-bottom: 1px solid rgba(174, 184, 179, 0.16); }

  .sy-nav__link {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
    padding: 16px 2px;
    font-family: var(--sy-display);
    font-weight: 800;
    font-size: clamp(19px, 5vw, 25px);
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--sy-paper);
    white-space: normal;
  }

  .sy-nav__index { font-size: 11px; color: rgba(184, 255, 63, 0.85); }
  .sy-nav__link::after { display: none; }
  .sy-nav__link[aria-current="page"] { color: var(--sy-lime); }

  .sy-nav__foot {
    display: grid;
    gap: 10px;
    margin-top: clamp(20px, 4vw, 32px);
    padding-top: 18px;
    border-top: 1px dashed rgba(174, 184, 179, 0.26);
  }

  .sy-nav__foot-label {
    font-family: var(--sy-mono);
    font-size: 10px;
    font-weight: 500;
    line-height: 1;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(174, 184, 179, 0.78);
  }

  .sy-nav__foot-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
    background: rgba(18, 53, 45, 0.55);
    border: 1px solid rgba(174, 184, 179, 0.26);
    border-radius: var(--sy-radius);
    color: var(--sy-paper);
    font-size: 14px;
    text-decoration: none;
    transition: border-color 0.2s var(--sy-ease), color 0.2s var(--sy-ease);
  }

  .sy-nav__foot-link::after {
    content: "→";
    font-family: var(--sy-mono);
    color: var(--sy-lime);
  }

  .sy-nav__foot-link:hover {
    border-color: var(--sy-lime);
    color: var(--sy-lime);
  }

  .sy-footer__top { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .sy-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .sy-footer__nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sy-footer__contact { grid-template-columns: 1fr 1fr; }
  .sy-footer__contact > .sy-contact-item:last-child { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  body { font-size: 15.5px; }

  .sy-brand__name { font-size: 15.5px; }
  .sy-brand__mark { width: 23px; height: 23px; }
  .sy-brand__mark::before { inset: 4px; }

  .sy-footer__nav { grid-template-columns: 1fr 1fr; gap: 20px 18px; }
  .sy-footer__contact { grid-template-columns: 1fr; }
  .sy-footer__contact > .sy-contact-item:last-child { grid-column: auto; }
  .sy-footer__meta { justify-content: flex-start; }
}

/* ---------- 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;
    scroll-behavior: auto !important;
  }

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

  .sy-card:hover { transform: none; }
  .sy-progress__bar { transition: none; }
}

/* ---------- 打印 ---------- */
@media print {
  .sy-header,
  .sy-progress,
  .skip-link,
  .sy-footer__nav,
  .sy-footer::before { display: none !important; }
  body { padding-top: 0; background: #fff; color: #000; }
  .sy-footer { background: #fff; color: #000; border-top: 1px solid #000; }
  .sy-footer__brand-line,
  .sy-contact-item__value { color: #000; }
}