/* ==========================================================================
   海鸥赛场 · seagull-sports-haiou.com.cn
   共享站点样式 /assets/site.css
   顺序：变量 → 重置 → 中文排版 → 通用组件 → 头部 → 页脚 → 响应式 → 动效偏好
   ========================================================================== */

:root{
  --sg-white:#F7FAFC;
  --sg-mist:#E8F1F7;
  --sg-deep:#0B2A4A;
  --sg-tide:#164A73;
  --sg-sea:#2B7FB8;
  --sg-lime:#2FE3B0;
  --sg-coral:#D94F32;
  --sg-salt:#5E7183;
  --sg-glass:#A9C9DE;
  --sg-night:#061A2E;

  --sg-font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --sg-font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --sg-font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --sg-container:1280px;
  --sg-gutter:24px;
  --sg-radius-s:8px;
  --sg-radius-m:14px;
  --sg-radius-l:22px;

  --sg-shadow-s:0 2px 10px -4px rgba(6,26,46,.25);
  --sg-shadow-m:0 22px 48px -34px rgba(6,26,46,.8);
  --sg-hairline:1px solid rgba(169,201,222,.6);
  --sg-ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--sg-font-sans);
  font-size:1rem;
  line-height:1.7;
  color:var(--sg-deep);
  background:var(--sg-white);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:var(--sg-tide);text-decoration:none;transition:color .2s var(--sg-ease)}
a:hover{color:var(--sg-sea)}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,picture,svg,video{max-width:100%;display:block}
:focus-visible{outline:2px solid var(--sg-coral);outline-offset:3px;border-radius:4px}

/* ---------- 中文排版层级 ---------- */
h1,h2,h3,h4{font-weight:800;letter-spacing:-.012em;line-height:1.15;color:var(--sg-deep);text-wrap:balance}
h1,h2{font-family:var(--sg-font-display)}
h1{font-size:clamp(2.5rem,5.4vw,5.25rem);line-height:1.05;letter-spacing:-.02em}
h2{font-size:clamp(1.75rem,3vw,2.6rem)}
h3{font-family:var(--sg-font-sans);font-size:clamp(1.15rem,1.6vw,1.5rem);line-height:1.35}
h4{font-family:var(--sg-font-sans);font-size:1.05rem;line-height:1.4}
p{text-wrap:pretty}

/* ---------- 布局通用 ---------- */
.sg-container{width:100%;max-width:var(--sg-container);margin-inline:auto;padding-inline:var(--sg-gutter)}
.sg-section{padding-block:clamp(48px,7vw,104px)}
.sg-section--tight{padding-block:clamp(28px,4vw,52px)}
.sg-section--mist{background:var(--sg-mist)}
.sg-section--night{background:var(--sg-night);color:var(--sg-white)}
.sg-section--night h2,.sg-section--night h3,.sg-section--night h4{color:var(--sg-white)}

.sg-stack{display:flex;flex-direction:column;gap:var(--sg-gap,16px)}
.sg-cluster{display:flex;flex-wrap:wrap;align-items:center;gap:var(--sg-gap,12px)}

.sg-grid{display:grid;gap:clamp(16px,2vw,28px)}
.sg-grid--split{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.sg-grid--split-rev{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.sg-grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}
.sg-grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr))}

.sg-rule{height:1px;border:0;background:linear-gradient(90deg,transparent,rgba(169,201,222,.95),transparent)}

/* ---------- 章节小标 ---------- */
.sg-eyebrow{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--sg-font-mono);font-size:.72rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--sg-tide);
}
.sg-eyebrow::before{
  content:"";width:28px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--sg-sea),var(--sg-lime));
}
.sg-section--night .sg-eyebrow{color:var(--sg-lime)}

/* ---------- 按钮 ---------- */
.sg-btn{
  display:inline-flex;align-items:center;gap:.55em;
  padding:.72em 1.3em;border-radius:999px;border:1px solid transparent;
  font-size:.95rem;font-weight:700;line-height:1.25;
  transition:transform .2s var(--sg-ease),background-color .2s var(--sg-ease),color .2s var(--sg-ease),border-color .2s var(--sg-ease),box-shadow .2s var(--sg-ease);
}
.sg-btn:hover{transform:translateY(-2px)}
.sg-btn--primary{background:var(--sg-deep);color:var(--sg-white)}
.sg-btn--primary:hover{background:var(--sg-tide);color:var(--sg-white)}
.sg-btn--coral{background:var(--sg-coral);color:var(--sg-white);box-shadow:0 16px 28px -20px rgba(217,79,50,.95)}
.sg-btn--coral:hover{background:#c8432a;color:var(--sg-white)}
.sg-btn--ghost{background:transparent;color:var(--sg-tide);border-color:rgba(22,74,115,.35)}
.sg-btn--ghost:hover{background:rgba(43,127,184,.1);color:var(--sg-deep);border-color:var(--sg-sea)}
.sg-btn--lime{background:var(--sg-lime);color:var(--sg-night)}
.sg-btn--lime:hover{background:#25c99b;color:var(--sg-night)}

/* ---------- 面包屑 ---------- */
.sg-breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5em;
  font-family:var(--sg-font-mono);font-size:.78rem;letter-spacing:.04em;color:var(--sg-salt);
}
.sg-breadcrumb a{color:var(--sg-tide);text-decoration:underline;text-decoration-color:rgba(43,127,184,.45);text-underline-offset:3px}
.sg-breadcrumb a:hover{color:var(--sg-sea)}
.sg-breadcrumb__sep{opacity:.55}
.sg-section--night .sg-breadcrumb{color:rgba(247,250,252,.7)}

/* ---------- 长文 ---------- */
.sg-prose{max-width:38em;font-size:1.0625rem;line-height:1.85;color:var(--sg-deep)}
.sg-prose > * + *{margin-top:1.1em}
.sg-prose h2{margin-top:2.1em;font-size:clamp(1.5rem,2.4vw,2rem)}
.sg-prose h3{margin-top:1.8em}
.sg-prose ul{display:flex;flex-direction:column;gap:.5em}
.sg-prose ul li{position:relative;padding-left:1.35em}
.sg-prose ul li::before{
  content:"";position:absolute;left:0;top:.68em;
  width:8px;height:2px;border-radius:2px;background:var(--sg-sea);
}
.sg-prose a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(43,127,184,.45)}
.sg-prose strong{font-weight:700}
.sg-section--night .sg-prose{color:rgba(247,250,252,.88)}

/* ---------- 卡片 ---------- */
.sg-card{
  position:relative;
  padding:clamp(18px,2vw,28px);
  background:var(--sg-white);
  border:1px solid rgba(169,201,222,.75);
  border-radius:var(--sg-radius-m);
  transition:transform .22s var(--sg-ease),border-color .22s var(--sg-ease),box-shadow .22s var(--sg-ease);
}
.sg-card:hover{transform:translateY(-3px);border-color:var(--sg-sea);box-shadow:var(--sg-shadow-m)}
.sg-card__title{font-family:var(--sg-font-sans);font-size:1.1rem;font-weight:700;line-height:1.4}
.sg-card__meta{font-family:var(--sg-font-mono);font-size:.76rem;letter-spacing:.08em;color:var(--sg-salt)}
.sg-card--glass{
  background:linear-gradient(180deg,rgba(6,26,46,.62),rgba(11,42,74,.5));
  border-color:rgba(169,201,222,.32);
  color:var(--sg-white);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
}
.sg-card--glass .sg-card__title{color:var(--sg-white)}
.sg-card--glass .sg-card__meta{color:rgba(247,250,252,.7)}

/* ---------- 数据与标签 ---------- */
.sg-data{font-family:var(--sg-font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.sg-data--lime{color:var(--sg-lime)}
.sg-data--coral{color:var(--sg-coral)}
.sg-section--night .sg-data--coral{color:#ff8168}

.sg-tag{
  display:inline-flex;align-items:center;gap:.45em;
  padding:.2em .7em;border-radius:999px;
  font-family:var(--sg-font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--sg-tide);background:rgba(43,127,184,.12);border:1px solid rgba(43,127,184,.3);
}
.sg-tag--coral{color:#a83620;background:rgba(217,79,50,.12);border-color:rgba(217,79,50,.35)}
.sg-tag--lime{color:var(--sg-tide);background:rgba(47,227,176,.18);border-color:rgba(47,227,176,.5)}
.sg-section--night .sg-tag{color:var(--sg-lime);background:rgba(47,227,176,.14);border-color:rgba(47,227,176,.4)}

/* ---------- 图片容器基础 ---------- */
.sg-media{
  position:relative;isolation:isolate;overflow:hidden;
  border-radius:var(--sg-radius-m);
  aspect-ratio:16 / 9;
  background:
    linear-gradient(135deg,rgba(43,127,184,.28),rgba(47,227,176,.16) 48%,rgba(11,42,74,.24));
}
.sg-media::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(247,250,252,.22) 0 1px,transparent 1px 26px);
  opacity:.55;
}
.sg-media img,.sg-media video{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.sg-media__label{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:.45em .85em;border-top-right-radius:10px;
  font-family:var(--sg-font-mono);font-size:.72rem;letter-spacing:.1em;
  color:var(--sg-white);background:rgba(6,26,46,.78);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.sg-media--wide{aspect-ratio:21 / 9}
.sg-media--tall{aspect-ratio:4 / 5}
.sg-media--square{aspect-ratio:1 / 1}

/* ==========================================================================
   头部：悬浮玻璃铭牌 → 靠岸实色阅读态
   ========================================================================== */
.sg-header{
  position:sticky;top:0;z-index:120;
  padding:12px 0 0;
  color:var(--sg-white);
  --sg-nav-accent:var(--sg-lime);
  transition:color .28s var(--sg-ease);
}
.sg-header[data-nav-state="docked"]{color:var(--sg-deep);--sg-nav-accent:var(--sg-sea)}

.sg-skip{
  position:fixed;top:8px;left:50%;z-index:200;
  transform:translate(-50%,-180%);
  padding:.68em 1.25em;border-radius:999px;
  background:var(--sg-night);color:var(--sg-white);
  font-size:.9rem;font-weight:700;letter-spacing:.02em;
  box-shadow:0 18px 34px -22px rgba(6,26,46,.95);
  transition:transform .2s var(--sg-ease);
}
.sg-skip:focus-visible{transform:translate(-50%,0);outline-color:var(--sg-lime)}

.sg-header__progress{
  position:fixed;top:0;left:0;right:0;z-index:130;height:3px;
  background:rgba(11,42,74,.12);pointer-events:none;
}
.sg-header__progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--sg-sea),var(--sg-lime));
  transition:width .12s linear;
}

.sg-header__shell{
  position:relative;
  width:min(calc(100% - 40px),1320px);
  margin-inline:auto;
  border-radius:var(--sg-radius-l);
  border:1px solid rgba(169,201,222,.26);
  background:linear-gradient(180deg,rgba(6,26,46,.8),rgba(6,26,46,.58));
  -webkit-backdrop-filter:blur(18px) saturate(150%);
  backdrop-filter:blur(18px) saturate(150%);
  box-shadow:0 26px 60px -46px rgba(6,26,46,.95);
  transition:background-color .3s var(--sg-ease),background .3s var(--sg-ease),border-color .3s var(--sg-ease),box-shadow .3s var(--sg-ease);
}
.sg-header[data-nav-state="docked"] .sg-header__shell{
  background:linear-gradient(180deg,rgba(247,250,252,.97),rgba(232,241,247,.94));
  border-color:rgba(169,201,222,.85);
  box-shadow:0 20px 44px -34px rgba(11,42,74,.6);
}

.sg-header__inner{
  display:flex;align-items:center;gap:clamp(10px,1.6vw,26px);
  min-height:64px;padding:10px clamp(12px,1.6vw,22px);
}

.sg-brand{display:inline-flex;align-items:center;gap:12px;flex:none;color:inherit;text-decoration:none}
.sg-brand:hover{color:inherit}
.sg-brand__mark{
  width:38px;height:38px;flex:none;
  background:linear-gradient(155deg,var(--sg-lime),var(--sg-sea) 72%);
  clip-path:polygon(0 58%,25% 26%,50% 58%,75% 26%,100% 58%,100% 100%,0 100%);
  filter:drop-shadow(0 6px 10px rgba(47,227,176,.28));
}
.sg-brand__text{display:flex;flex-direction:column;line-height:1.15}
.sg-brand__label{
  font-family:var(--sg-font-display);font-weight:800;
  font-size:1.18rem;letter-spacing:.04em;color:inherit;
}
.sg-brand__sublabel{
  font-family:var(--sg-font-mono);font-size:.66rem;letter-spacing:.1em;
  color:inherit;opacity:.72;white-space:nowrap;
}

.sg-nav{flex:1 1 auto;display:flex;justify-content:center;min-width:0}
.sg-nav__list{display:flex;align-items:stretch;gap:clamp(2px,.8vw,12px)}
.sg-nav__item{display:flex}
.sg-nav__link{
  position:relative;display:inline-flex;flex-direction:column;align-items:flex-start;gap:2px;
  padding:6px 10px;border-radius:10px;
  color:inherit;font-size:.94rem;font-weight:600;letter-spacing:.01em;white-space:nowrap;
  transition:color .2s var(--sg-ease),background-color .2s var(--sg-ease);
}
.sg-nav__link:hover{background:rgba(169,201,222,.16)}
.sg-nav__index{
  font-family:var(--sg-font-mono);font-size:.6rem;line-height:1;
  letter-spacing:.12em;opacity:.6;
}
.sg-nav__link::after{
  content:"";position:absolute;left:10px;right:10px;bottom:2px;height:2px;border-radius:2px;
  background:var(--sg-nav-accent);transform:scaleX(0);transform-origin:left;
  transition:transform .24s var(--sg-ease);
}
.sg-nav__link:hover::after,.sg-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.sg-nav__link[aria-current="page"]{color:var(--sg-nav-accent)}
.sg-nav__link[aria-current="page"] .sg-nav__index{opacity:1}

.sg-header__actions{display:flex;align-items:center;gap:6px;flex:none;margin-left:auto}
.sg-tool{
  display:inline-flex;align-items:center;gap:.45em;
  padding:8px 10px;border-radius:999px;border:1px solid transparent;
  color:inherit;font-size:.82rem;font-weight:600;white-space:nowrap;
  transition:background-color .2s var(--sg-ease),border-color .2s var(--sg-ease),transform .2s var(--sg-ease);
}
.sg-tool::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--sg-nav-accent);flex:none;
}
.sg-tool:hover{
  transform:translateY(-1px);color:inherit;background:rgba(169,201,222,.18);
  border-color:rgba(169,201,222,.55);
}
.sg-header__cta{
  display:inline-flex;align-items:center;gap:.4em;
  padding:9px 16px;border-radius:999px;
  background:var(--sg-coral);color:var(--sg-white);
  font-size:.84rem;font-weight:700;white-space:nowrap;
  box-shadow:0 14px 26px -18px rgba(217,79,50,.95);
  transition:transform .2s var(--sg-ease),background-color .2s var(--sg-ease);
}
.sg-header__cta:hover{transform:translateY(-2px);background:#c8432a;color:var(--sg-white)}

.sg-nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;
  border:1px solid rgba(169,201,222,.45);
  color:inherit;font-size:.84rem;font-weight:700;white-space:nowrap;
  transition:background-color .2s var(--sg-ease),border-color .2s var(--sg-ease);
}
.sg-nav-toggle:hover{background:rgba(169,201,222,.18)}
.sg-nav-toggle__bars{position:relative;width:16px;height:2px;border-radius:2px;background:currentColor;transition:background-color .2s var(--sg-ease)}
.sg-nav-toggle__bars::before,
.sg-nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:currentColor;transition:transform .24s var(--sg-ease),top .24s var(--sg-ease);
}
.sg-nav-toggle__bars::before{top:-5px}
.sg-nav-toggle__bars::after{top:5px}
.sg-nav-toggle__label{line-height:1}
.sg-header[data-open="true"] .sg-nav-toggle__bars{background:transparent}
.sg-header[data-open="true"] .sg-nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.sg-header[data-open="true"] .sg-nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

/* 移动端底部快捷轨（默认隐藏） */
.sg-quickrail{display:none}
.sg-quickrail__link{color:var(--sg-white)}
.sg-quickrail__key{font-family:var(--sg-font-mono)}
.sg-quickrail__link[aria-current="page"]{background:rgba(47,227,176,.18)}

/* ==========================================================================
   页脚：夜潮蓝数据甲板
   ========================================================================== */
.sg-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,8vw,96px);
  color:rgba(247,250,252,.86);
  background:
    radial-gradient(120% 82% at 10% 0%,rgba(43,127,184,.4),transparent 62%),
    radial-gradient(90% 70% at 94% 10%,rgba(47,227,176,.16),transparent 64%),
    var(--sg-night);
}
.sg-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(47,227,176,.85),rgba(169,201,222,.35),transparent);
}
.sg-footer__inner{
  display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(28px,4vw,64px);
  padding-block:clamp(40px,6vw,76px);
}
.sg-footer__brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.sg-brand--footer .sg-brand__label{font-size:1.35rem}
.sg-brand--footer .sg-brand__sublabel{opacity:.6}
.sg-footer__pitch{
  font-family:var(--sg-font-display);font-size:1.1rem;line-height:1.6;
  color:var(--sg-white);max-width:22em;
}
.sg-footer__note{font-size:.85rem;line-height:1.7;color:rgba(247,250,252,.62);max-width:26em}
.sg-footer__grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px)}
.sg-footer__col{min-width:0}
.sg-footer__col--contact{grid-column:auto}
.sg-footer__title{
  font-family:var(--sg-font-mono);font-size:.72rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--sg-lime);
  margin-bottom:16px;
}
.sg-footer__list{display:flex;flex-direction:column;gap:10px}
.sg-footer__link{
  display:inline-flex;align-items:center;gap:9px;
  color:rgba(247,250,252,.88);font-size:.95rem;
  transition:color .2s var(--sg-ease),transform .2s var(--sg-ease);
}
.sg-footer__link::before{
  content:"";width:6px;height:6px;flex:none;border-radius:50%;
  border:1px solid rgba(169,201,222,.65);
  transition:background-color .2s var(--sg-ease),border-color .2s var(--sg-ease);
}
.sg-footer__link:hover{color:var(--sg-white);transform:translateX(3px)}
.sg-footer__link:hover::before{background:var(--sg-lime);border-color:var(--sg-lime)}
.sg-footer__contact li{display:grid;gap:3px}
.sg-footer__contact-key{
  font-family:var(--sg-font-mono);font-size:.68rem;letter-spacing:.16em;
  text-transform:uppercase;color:rgba(47,227,176,.85);
}
.sg-footer__contact-value{
  color:rgba(247,250,252,.9);font-size:.9rem;line-height:1.55;
  overflow-wrap:anywhere;word-break:break-word;
}
.sg-footer__baseline{
  border-top:1px solid rgba(169,201,222,.22);
  background:rgba(6,26,46,.55);
}
.sg-footer__baseline-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;padding-block:18px;
}
.sg-footer__legal{font-family:var(--sg-font-mono);font-size:.78rem;letter-spacing:.04em;color:rgba(247,250,252,.72)}
.sg-footer__legalnav{display:flex;flex-wrap:wrap;gap:6px 20px;font-size:.82rem}
.sg-footer__legalnav a{
  color:rgba(247,250,252,.82);text-decoration:underline;
  text-underline-offset:4px;text-decoration-color:rgba(47,227,176,.45);
}
.sg-footer__legalnav a:hover{color:var(--sg-lime);text-decoration-color:var(--sg-lime)}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1279px){
  .sg-tool{display:none}
}

@media (max-width:1079px){
  .sg-header{padding-top:8px}
  .sg-header__shell{width:calc(100% - 20px);border-radius:16px}
  .sg-header__inner{min-height:60px;gap:10px}
  .sg-nav-toggle{display:inline-flex}
  .sg-nav{
    position:absolute;top:calc(100% + 10px);left:0;right:0;
    display:none;flex-direction:column;min-width:0;
    padding:14px;border-radius:var(--sg-radius-l);
    background:linear-gradient(180deg,rgba(6,26,46,.98),rgba(11,42,74,.98));
    border:1px solid rgba(169,201,222,.3);
    box-shadow:0 34px 70px -42px rgba(6,26,46,.95);
    -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
    --sg-nav-accent:var(--sg-lime);
  }
  .sg-header[data-open="true"] .sg-nav{display:block}
  .sg-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .sg-nav__item{display:block}
  .sg-nav__link{
    flex-direction:row;align-items:baseline;gap:10px;
    padding:12px 12px;border-radius:12px;
    color:var(--sg-white);font-size:1rem;
  }
  .sg-nav__link::after{left:12px;right:12px;bottom:6px}
  .sg-nav__index{font-size:.66rem;opacity:.5}
  body.sg-nav-open{overflow:hidden}
}

@media (max-width:900px){
  .sg-grid--split,.sg-grid--split-rev,.sg-grid--halves,.sg-grid--thirds{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:1023px){
  .sg-footer__inner{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:720px){
  :root{--sg-gutter:18px}
  .sg-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sg-footer__col--contact{grid-column:1 / -1}
  .sg-footer__baseline-inner{flex-direction:column;align-items:flex-start}
  .sg-quickrail{
    position:fixed;left:50%;bottom:10px;z-index:110;
    transform:translateX(-50%);
    display:flex;gap:4px;width:calc(100% - 24px);max-width:420px;
    padding:6px;border-radius:999px;
    background:rgba(6,26,46,.93);
    border:1px solid rgba(169,201,222,.3);
    box-shadow:0 22px 46px -28px rgba(6,26,46,.95);
    -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  }
  .sg-quickrail__link{
    flex:1 1 0;display:flex;flex-direction:column;align-items:center;gap:1px;
    padding:7px 4px;border-radius:999px;
    font-size:.78rem;font-weight:700;line-height:1.3;text-align:center;
    transition:background-color .2s var(--sg-ease);
  }
  .sg-quickrail__key{font-size:.58rem;letter-spacing:.16em;color:var(--sg-lime);opacity:.85}
  .sg-quickrail__link:hover{background:rgba(169,201,222,.18);color:var(--sg-white)}
  body{padding-bottom:78px}
}

@media (max-width:600px){
  .sg-brand__sublabel{display:none}
  .sg-brand__label{font-size:1.05rem}
  .sg-brand__mark{width:32px;height:32px}
  .sg-header__cta{padding:8px 13px;font-size:.8rem}
  .sg-footer__grid{grid-template-columns:minmax(0,1fr)}
  .sg-footer__col--contact{grid-column:auto}
}

@media (max-width:479px){
  .sg-header__cta{display:none}
  .sg-nav-toggle__label{display:none}
  .sg-nav-toggle{padding:9px 11px}
}

/* ==========================================================================
   动效偏好与显现钩子
   ========================================================================== */
.sg-js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .55s var(--sg-ease),transform .55s var(--sg-ease);
}
.sg-js [data-reveal].is-visible{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .sg-btn:hover,.sg-card:hover,.sg-tool:hover,.sg-header__cta:hover,.sg-footer__link:hover{transform:none}
  .sg-js [data-reveal]{opacity:1;transform:none}
  .sg-header__progress-bar{transition:none}
}