/* ==========================================================================
   海豚看台 · dolphin-haitun.com.cn
   共享样式表 /assets/site.css
   涵盖：reset、令牌、中文排版、头部、页脚、通用按钮、面包屑、容器、
         网格、基础组件、媒体容器、响应式与可达性
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --deep:#061A33;
  --trench:#0B2A4A;
  --surge:#17E0C8;
  --volt:#2F7BFF;
  --jump:#FF7A29;
  --coral:#FF6B8A;
  --turf:#34C77B;
  --paper:#F7FBFE;
  --mist:#9FB3C8;
  --gray:#6C8299;

  --line:rgba(159,179,200,.18);
  --line-soft:rgba(159,179,200,.10);
  --line-strong:rgba(159,179,200,.36);

  --shadow-1:0 1px 0 rgba(255,255,255,.04), 0 10px 26px rgba(0,0,0,.30);
  --shadow-2:0 2px 0 rgba(255,255,255,.05), 0 20px 46px rgba(0,0,0,.46);
  --glow-surge:0 10px 28px rgba(23,224,200,.26);
  --glow-jump:0 10px 28px rgba(255,122,41,.28);

  --r-s:4px;
  --r-m:12px;
  --r-l:22px;

  --font-sans:"Inter","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --fs-1:12px;
  --fs-2:14px;
  --fs-3:16px;
  --fs-4:20px;
  --fs-5:28px;
  --fs-6:40px;
  --fs-7:64px;
  --fs-8:96px;

  --rail:236px;
  --bar:58px;
  --maxw:1200px;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after{ box-sizing:border-box; }

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

body{
  margin:0;
  background-color:var(--deep);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:var(--fs-3);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* 背景等高线 + 洋流光晕：极慢位移，纯装饰 */
body::before{
  content:"";
  position:fixed;
  inset:-22% -12% -12% -12%;
  z-index:0;
  pointer-events:none;
  background-image:
    repeating-radial-gradient(circle at 76% -6%, rgba(159,179,200,.13) 0 1px, transparent 1px 54px),
    radial-gradient(70% 55% at 84% 2%, rgba(47,123,255,.18), transparent 62%),
    radial-gradient(62% 50% at 2% 98%, rgba(23,224,200,.11), transparent 64%);
  animation:contour-drift 24s ease-in-out infinite alternate;
}

@keyframes contour-drift{
  from{ transform:translate3d(0,0,0) scale(1); }
  to{ transform:translate3d(-1.6%,1.4%,0) scale(1.035); }
}

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

button{ font:inherit; }

a{ color:inherit; }

::selection{
  background:rgba(23,224,200,.28);
  color:var(--paper);
}

/* ---------- 3. 中文排版基线 ---------- */
h1,
h2,
h3,
h4,
h5{
  margin:0;
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.005em;
}

p{ margin:0; }

ul,
ol{ margin:0; padding:0; }

.display-1{
  font-size:clamp(42px,10vw,var(--fs-8));
  font-weight:900;
  line-height:.94;
  letter-spacing:-.03em;
}

.display-2{
  font-size:clamp(28px,5.4vw,var(--fs-7));
  font-weight:900;
  line-height:1.02;
  letter-spacing:-.025em;
}

.heading{
  font-size:clamp(20px,3vw,var(--fs-5));
  font-weight:800;
  line-height:1.24;
}

.lead{
  font-size:clamp(15px,2.2vw,18px);
  line-height:1.8;
  color:var(--mist);
  max-width:720px;
}

.prose{
  max-width:720px;
  font-size:17px;
  line-height:1.75;
  color:var(--mist);
}

.prose p{ margin:0 0 1.1em; }
.prose p:last-child{ margin-bottom:0; }

.prose a{
  color:var(--surge);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
}

.prose strong{ color:var(--paper); font-weight:700; }

.data-num{
  font-family:var(--font-mono);
  font-weight:600;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.02em;
}

.en-dim{ opacity:.82; letter-spacing:.04em; }

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--surge);
}

.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:var(--surge);
  opacity:.7;
}

.link-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:var(--fs-2);
  font-weight:700;
  color:var(--surge);
  text-decoration:none;
  border-bottom:1px solid rgba(23,224,200,.35);
  padding-bottom:2px;
  transition:gap .18s ease, border-color .18s ease;
}

.link-more::after{
  content:"\2192";
  font-family:var(--font-mono);
}

.link-more:hover{
  gap:11px;
  border-color:var(--surge);
}

/* ---------- 4. 可达性与焦点 ---------- */
:focus-visible{
  outline:2px solid var(--surge);
  outline-offset:2px;
  border-radius:2px;
}

a:focus-visible,
button:focus-visible{
  outline:2px solid var(--surge);
  outline-offset:2px;
}

.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:400;
  transform:translateY(-180%);
  display:inline-block;
  padding:10px 18px;
  background:var(--surge);
  color:var(--deep);
  font-size:var(--fs-2);
  font-weight:700;
  text-decoration:none;
  border-radius:var(--r-s);
  transition:transform .18s ease;
}

.skip-link:focus,
.skip-link:focus-visible{
  transform:translateY(0);
}

/* ---------- 5. 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 20px;
}

#main-content{
  position:relative;
  z-index:1;
  padding-top:var(--bar);
}

.section{
  position:relative;
  padding:56px 0;
}

.section--trench{
  background:var(--trench);
  border-top:.5px solid var(--line);
  border-bottom:.5px solid var(--line);
}

.section--paper{
  background:var(--paper);
  color:var(--deep);
}

.section--paper .lead,
.section--paper .prose{ color:var(--gray); }

.section--paper .heading,
.section--paper .display-1,
.section--paper .display-2{ color:var(--deep); }

.page-head{
  position:relative;
  padding:34px 0 26px;
  border-bottom:.5px solid var(--line);
  overflow:hidden;
}

.page-head::after{
  content:"";
  position:absolute;
  right:-90px;
  top:-120px;
  width:280px;
  height:280px;
  border:.5px solid var(--line-strong);
  border-radius:50%;
  pointer-events:none;
}

.page-head__title{
  margin-top:14px;
  font-size:clamp(30px,5vw,var(--fs-7));
  font-weight:900;
  line-height:1.02;
  letter-spacing:-.025em;
}

.breather{
  padding:42px 0;
  border-top:.5px solid var(--line);
  border-bottom:.5px solid var(--line);
  background:linear-gradient(90deg, rgba(23,224,200,.07), rgba(47,123,255,.05) 58%, transparent);
}

.breather__line{
  margin:0;
  font-size:clamp(18px,2.6vw,26px);
  font-weight:800;
  line-height:1.4;
  color:var(--paper);
  letter-spacing:-.01em;
}

.rule-slash{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg, var(--surge), rgba(47,123,255,.5) 45%, transparent);
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb{
  display:block;
  padding:18px 0 0;
}

.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:var(--fs-1);
  color:var(--mist);
}

.breadcrumb li + li::before{
  content:"/";
  margin-right:8px;
  color:var(--gray);
  opacity:.7;
}

.breadcrumb a{
  color:var(--mist);
  text-decoration:none;
  transition:color .18s ease;
}

.breadcrumb a:hover{ color:var(--surge); }

.breadcrumb [aria-current="page"]{ color:var(--surge); }

/* ---------- 7. 头部：桌面左缘坐标索引 / 移动顶部细带 + 底部抽屉 ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:120;
  display:flex;
  flex-direction:column;
  --tide:0%;
  background:linear-gradient(180deg, rgba(6,26,51,.94) 0%, rgba(6,26,51,.66) 68%, rgba(6,26,51,0) 100%);
  border-bottom:.5px solid transparent;
  transition:background .3s ease, border-color .3s ease;
}

.site-header[data-state="solid"]{
  background:rgba(6,26,51,.985);
  border-bottom-color:var(--line);
}

.header-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-height:var(--bar);
  padding:0 16px;
  position:relative;
  z-index:2;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  text-decoration:none;
  color:var(--paper);
  min-width:0;
}

.brand-mark{
  width:28px;
  height:22px;
  flex:none;
  color:var(--surge);
  display:block;
}

.brand-name{
  font-size:17px;
  font-weight:900;
  letter-spacing:.02em;
  white-space:nowrap;
}

.brand-sub{
  display:none;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--mist);
  opacity:.55;
}

.season-chip{
  display:none;
  align-items:center;
  gap:8px;
  margin:0;
  padding:5px 12px;
  border:.5px solid var(--line-strong);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  color:var(--mist);
  white-space:nowrap;
}

.season-dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--jump);
  box-shadow:0 0 0 3px rgba(255,122,41,.2);
  flex:none;
}

.season-value{
  font-weight:600;
  color:var(--surge);
  letter-spacing:-.01em;
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:8px 13px;
  background:rgba(11,42,74,.78);
  color:var(--paper);
  border:.5px solid var(--line-strong);
  border-radius:999px;
  font-size:13px;
  font-weight:700;
  cursor:pointer;
  transition:border-color .2s ease, color .2s ease, transform .2s ease;
}

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

.nav-toggle-bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  width:15px;
  flex:none;
}

.nav-toggle-bars i{
  display:block;
  height:1.5px;
  width:100%;
  background:var(--surge);
  border-radius:2px;
  transition:transform .22s ease, opacity .22s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){
  transform:translateY(4.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){
  opacity:0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){
  transform:translateY(-4.5px) rotate(-45deg);
}

.nav-toggle-text{ white-space:nowrap; }

.site-nav{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:130;
  max-height:78vh;
  overflow-y:auto;
  padding:20px 16px 30px;
  background:rgba(6,26,51,.99);
  border-top:.5px solid var(--line-strong);
  border-radius:18px 18px 0 0;
  box-shadow:0 -22px 60px rgba(0,0,0,.55);
  transform:translateY(102%);
  visibility:hidden;
  transition:transform .34s cubic-bezier(.22,.72,.28,1), visibility .34s linear;
}

.site-nav[data-open]{
  transform:translateY(0);
  visibility:visible;
}

.nav-caption{
  margin:0;
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--mist);
  opacity:.62;
}

.nav-list{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
  list-style:none;
  margin:14px 0 0;
  padding:0;
}

.nav-item{ display:block; }

.nav-link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:12px 13px;
  background:rgba(11,42,74,.62);
  border:.5px solid var(--line);
  border-radius:var(--r-m);
  color:var(--paper);
  text-decoration:none;
  font-size:15px;
  font-weight:600;
  transition:background .2s ease, border-color .2s ease, color .2s ease, transform .2s ease;
}

.nav-link:hover{
  border-color:var(--line-strong);
  transform:translateY(-2px);
}

.nav-num{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--surge);
  opacity:.85;
  flex:none;
}

.nav-text{
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.nav-link[aria-current="page"]{
  background:rgba(23,224,200,.12);
  border-color:rgba(23,224,200,.5);
  color:var(--surge);
}

.nav-link[aria-current="page"] .nav-num{ color:var(--jump); opacity:1; }

.nav-foot{
  margin:16px 0 0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--gray);
}

.scroll-tide{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  background:rgba(159,179,200,.14);
  overflow:hidden;
  pointer-events:none;
  z-index:1;
}

.scroll-tide::after{
  content:"";
  display:block;
  height:100%;
  width:var(--tide,0%);
  background:linear-gradient(90deg, var(--volt), var(--surge));
  transition:width .1s linear;
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:72px;
  background:linear-gradient(180deg, var(--deep) 0%, #040F1F 100%);
  border-top:.5px solid var(--line);
  color:var(--mist);
}

.footer-coast{
  position:relative;
  height:58px;
  overflow:hidden;
  border-bottom:.5px solid var(--line-soft);
  background:
    radial-gradient(120% 160% at 0% 100%, rgba(23,224,200,.16), transparent 62%),
    radial-gradient(120% 160% at 100% 100%, rgba(47,123,255,.18), transparent 62%);
}

.footer-coast::after{
  content:"";
  position:absolute;
  left:-8%;
  right:-8%;
  bottom:-52px;
  height:86px;
  border-radius:50% 50% 0 0 / 74px 74px 0 0;
  background:linear-gradient(180deg, rgba(23,224,200,.2), rgba(23,224,200,0));
}

.footer-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:42px 20px 26px;
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
}

.footer-brand{ display:block; }

.brand--footer .brand-mark{
  width:32px;
  height:25px;
}

.brand--footer .brand-name{ font-size:18px; }

.footer-note{
  margin:14px 0 0;
  max-width:340px;
  font-size:var(--fs-2);
  line-height:1.8;
  color:var(--mist);
}

.footer-nav{
  display:grid;
  grid-template-columns:1fr;
  gap:26px;
}

.footer-title{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--paper);
  opacity:.72;
}

.footer-col ul{
  list-style:none;
  display:grid;
  gap:9px;
  margin:0;
  padding:0;
}

.footer-col a{
  font-size:var(--fs-2);
  color:var(--mist);
  text-decoration:none;
  transition:color .18s ease;
}

.footer-col a:hover{ color:var(--surge); }

.footer-contact li{
  font-size:var(--fs-2);
  line-height:1.75;
  color:var(--mist);
}

.footer-base{
  max-width:var(--maxw);
  margin:0 auto;
  padding:16px 20px 30px;
  border-top:.5px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  gap:12px 22px;
  align-items:center;
  justify-content:space-between;
}

.footer-legal{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--gray);
}

.footer-links{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  margin:0;
  padding:0;
}

.footer-links a{
  font-size:12px;
  color:var(--mist);
  text-decoration:none;
  transition:color .18s ease;
}

.footer-links a:hover{ color:var(--surge); }

/* ---------- 9. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:.5px solid transparent;
  border-radius:999px;
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
}

.btn--jump{
  background:var(--jump);
  color:#061A33;
}

.btn--jump:hover{
  transform:translateY(-2px);
  box-shadow:var(--glow-jump);
}

.btn--surge{
  background:var(--surge);
  color:var(--deep);
}

.btn--surge:hover{
  transform:translateY(-2px);
  box-shadow:var(--glow-surge);
}

.btn--ghost{
  background:transparent;
  color:var(--paper);
  border-color:var(--line-strong);
}

.btn--ghost:hover{
  transform:translateY(-2px);
  border-color:var(--surge);
  color:var(--surge);
}

/* ---------- 10. 网格与卡片 ---------- */
.grid{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
}

.card{
  position:relative;
  padding:22px;
  background:rgba(11,42,74,.62);
  border:.5px solid var(--line);
  border-radius:var(--r-m);
  box-shadow:var(--shadow-1);
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-2);
  border-color:var(--line-strong);
}

.card__label{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--surge);
}

.section--paper .card{
  background:rgba(255,255,255,.72);
  border-color:rgba(6,26,51,.1);
  box-shadow:0 1px 0 rgba(6,26,51,.03), 0 12px 28px rgba(6,26,51,.08);
}

/* ---------- 11. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 11px;
  border:.5px solid var(--line-strong);
  border-radius:999px;
  background:rgba(11,42,74,.5);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  white-space:nowrap;
}

.tag--surge{ color:var(--surge); border-color:rgba(23,224,200,.4); background:rgba(23,224,200,.08); }
.tag--jump{ color:var(--jump); border-color:rgba(255,122,41,.4); background:rgba(255,122,41,.08); }
.tag--coral{ color:var(--coral); border-color:rgba(255,107,138,.42); background:rgba(255,107,138,.08); }
.tag--turf{ color:var(--turf); border-color:rgba(52,199,123,.42); background:rgba(52,199,123,.08); }

/* ---------- 12. 潮汐条带 ---------- */
.tide-row{
  display:flex;
  align-items:center;
  gap:12px;
  padding:10px 0;
  border-bottom:.5px solid var(--line);
}

.tide-row__label{
  flex:0 0 88px;
  font-size:13px;
  color:var(--mist);
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.tide-row__track{
  flex:1 1 auto;
  height:8px;
  border-radius:999px;
  background:rgba(159,179,200,.14);
  overflow:hidden;
}

.tide-row__fill{
  display:block;
  width:var(--w,0%);
  height:100%;
  border-radius:999px;
  background:linear-gradient(90deg, var(--volt), var(--surge));
  transition:width .6s cubic-bezier(.22,.72,.28,1);
}

.tide-row--jump .tide-row__fill{
  background:linear-gradient(90deg, var(--jump), var(--coral));
}

.tide-row--turf .tide-row__fill{
  background:linear-gradient(90deg, var(--turf), var(--surge));
}

/* ---------- 13. 图例 ---------- */
.legend{
  display:flex;
  flex-wrap:wrap;
  gap:8px 18px;
  list-style:none;
  margin:0;
  padding:0;
}

.legend__item{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-size:13px;
  color:var(--mist);
}

.legend__swatch{
  width:10px;
  height:10px;
  flex:none;
  border-radius:3px;
  background:var(--c, var(--surge));
}

/* ---------- 14. 数据表 ---------- */
.table-scroll{
  width:100%;
  overflow-x:auto;
  border:.5px solid var(--line);
  border-radius:var(--r-m);
  background:rgba(11,42,74,.5);
  -webkit-overflow-scrolling:touch;
}

table.data{
  width:100%;
  min-width:640px;
  border-collapse:collapse;
  font-size:var(--fs-2);
}

table.data caption{
  padding:12px 14px;
  text-align:left;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
  border-bottom:.5px solid var(--line);
}

table.data th{
  padding:12px 14px;
  text-align:left;
  white-space:nowrap;
  background:rgba(6,26,51,.66);
  border-bottom:.5px solid var(--line-strong);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--surge);
}

table.data td{
  padding:11px 14px;
  border-bottom:.5px solid var(--line);
  color:var(--mist);
}

table.data tbody tr:last-child td{ border-bottom:0; }

table.data tbody tr:hover td{
  background:rgba(23,224,200,.05);
  color:var(--paper);
}

table.data td .data-num{ color:var(--paper); }

/* ---------- 15. 媒体容器（页面阶段放图占位） ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border:.5px solid var(--line);
  border-radius:var(--r-m);
  isolation:isolate;
  background-color:var(--trench);
  background-image:
    radial-gradient(90% 80% at 78% 6%, rgba(47,123,255,.18), transparent 62%),
    repeating-linear-gradient(135deg, rgba(159,179,200,.07) 0 1px, transparent 1px 14px);
}

.media > img,
.media > video,
.media > svg{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}

.media--16x9{ aspect-ratio:16 / 9; }
.media--4x3{ aspect-ratio:4 / 3; }
.media--1x1{ aspect-ratio:1 / 1; }
.media--tall{ aspect-ratio:3 / 4; }
.media--poster{ aspect-ratio:21 / 9; }

.media__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:26px 16px 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--paper);
  background:linear-gradient(180deg, transparent, rgba(6,26,51,.9));
}

/* ---------- 16. 显现动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s ease, transform .6s ease;
}

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

/* ---------- 17. 平板 ---------- */
@media (min-width:640px){
  .wrap{ padding:0 32px; }

  .grid{ gap:18px; }
  .grid--2{ grid-template-columns:repeat(2, minmax(0,1fr)); }

  .season-chip{ display:inline-flex; }
  .footer-nav{ grid-template-columns:repeat(3, minmax(0,1fr)); }
}

@media (min-width:768px){
  .section{ padding:72px 0; }

  .breadcrumb{ padding-top:22px; }
}

@media (min-width:900px){
  .grid{ gap:20px; }
  .grid--3{ grid-template-columns:repeat(3, minmax(0,1fr)); }
  .grid--4{ grid-template-columns:repeat(2, minmax(0,1fr)); }

  .footer-inner{
    grid-template-columns:1.05fr 2.2fr;
    gap:36px;
    padding:52px 32px 30px;
  }

  .footer-base{ padding:18px 32px 34px; }
}

/* ---------- 18. 桌面：左缘潮汐索引 ---------- */
@media (min-width:1080px){
  body{ padding-left:var(--rail); }

  #main-content{ padding-top:0; }

  .site-header{
    right:auto;
    bottom:0;
    width:var(--rail);
    padding:34px 22px 26px;
    background:rgba(6,26,51,.72);
    border-right:.5px solid var(--line);
    border-bottom:0;
    transition:background .3s ease, border-color .3s ease;
  }

  .site-header[data-state="solid"]{
    background:rgba(6,26,51,.985);
    border-right-color:var(--line-strong);
    border-bottom-color:transparent;
  }

  .header-bar{
    flex-direction:column;
    align-items:flex-start;
    gap:18px;
    min-height:0;
    padding:0;
  }

  .brand-sub{ display:inline-block; }

  .season-chip{
    display:inline-flex;
    margin-top:2px;
  }

  .nav-toggle{ display:none; }

  .site-nav{
    position:static;
    transform:none;
    visibility:visible;
    max-height:none;
    overflow:visible;
    padding:0;
    margin-top:30px;
    background:transparent;
    border:0;
    border-radius:0;
    box-shadow:none;
  }

  .nav-caption{ font-size:10px; }

  .nav-list{
    grid-template-columns:1fr;
    gap:2px;
    margin-top:12px;
  }

  .nav-link{
    gap:12px;
    padding:8px 10px;
    background:transparent;
    border:0;
    border-left:2px solid transparent;
    border-radius:0;
    color:var(--mist);
    font-size:var(--fs-2);
    font-weight:600;
  }

  .nav-link:hover{
    transform:none;
    color:var(--paper);
    border-left-color:var(--volt);
    background:rgba(47,123,255,.08);
  }

  .nav-link[aria-current="page"]{
    color:var(--surge);
    border-left-color:var(--surge);
    background:rgba(23,224,200,.07);
  }

  .nav-foot{
    margin-top:22px;
    max-width:170px;
    line-height:1.7;
  }

  .scroll-tide{
    left:auto;
    right:0;
    top:0;
    bottom:0;
    width:2px;
    height:100%;
  }

  .scroll-tide::after{
    width:100%;
    height:var(--tide,0%);
    background:linear-gradient(180deg, var(--volt), var(--surge));
    transition:height .1s linear;
  }

  .grid--4{ grid-template-columns:repeat(4, minmax(0,1fr)); }

  .footer-inner{ padding-left:32px; padding-right:32px; }
}

/* ---------- 19. 大屏舒适度 ---------- */
@media (min-width:1320px){
  :root{ --rail:252px; }
}

/* ---------- 20. 缩减动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }

  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }

  body::before{ animation:none; }

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

  .tide-row__fill{ width:var(--w,0%); }
}