/* ============================================================
   乐鱼主站 · /assets/site.css
   深海数据台：深海基底 / 海沟蓝分区 / 乐鱼橙强调 / 电光青呼应
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:9.5rem}
body,h1,h2,h3,h4,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
::selection{background:rgba(255,107,44,.85);color:#08131d}

:root{
  --deep:#061826;
  --trench:#0B2B45;
  --orange:#FF6B2C;
  --cyan:#35E0D0;
  --red:#E23A3A;
  --yellow:#F4C542;
  --ice:#EAF6FF;
  --mist:#8FB3C7;
  --canvas:#F2F7FA;
  --ink:#0B1F2E;

  --hair:rgba(143,179,199,.20);
  --hair-strong:rgba(143,179,199,.40);
  --glass:rgba(11,43,69,.55);

  --r-sm:10px;
  --r-md:18px;
  --r-lg:26px;
  --r-xl:36px;
  --r-pill:999px;

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","Noto Sans Mono CJK SC",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell-max:1240px;
  --gutter:clamp(1rem,4vw,3.5rem);
  --ease:cubic-bezier(.22,.72,.28,1);
}

@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--ice);
  background-color:var(--deep);
  background-image:
    radial-gradient(90rem 40rem at 10% -12%, rgba(53,224,208,.10), transparent 62%),
    radial-gradient(70rem 34rem at 92% 2%, rgba(255,107,44,.075), transparent 64%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.12;letter-spacing:-.015em;color:#fff}
h1{font-size:clamp(2.8rem,7vw,6rem)}
h2{font-size:clamp(1.8rem,4vw,3.2rem)}
h3{font-size:clamp(1.15rem,2.2vw,1.5rem);line-height:1.32}
h4{font-size:1.05rem;letter-spacing:.01em}
p{font-size:1rem}
strong{font-weight:700;color:#fff}

.shell{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

.skip-link{
  position:absolute;left:50%;top:.4rem;z-index:300;
  transform:translate(-50%,-180%);
  padding:.7rem 1.35rem;border-radius:var(--r-pill);
  background:var(--orange);color:#08131d;font-weight:700;font-size:.9rem;
  letter-spacing:.06em;white-space:nowrap;
  transition:transform .22s var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0)}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  color:var(--ice);
  background:
    radial-gradient(120% 220% at 50% -150%, rgba(53,224,208,.20), transparent 62%),
    linear-gradient(180deg, rgba(6,24,38,.97), rgba(6,24,38,.88));
  border-bottom:1px solid var(--hair);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(53,224,208,.72),rgba(255,107,44,.5),transparent);
  opacity:.75;pointer-events:none;
}

.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:1rem;
  padding-block:clamp(.85rem,1.8vw,1.35rem);
}

.brand{
  grid-column:2;grid-row:1;justify-self:center;
  display:inline-flex;align-items:center;gap:.7rem;
  color:var(--ice);
}
.brand__mark{
  display:grid;place-items:center;
  width:2.35rem;height:2.35rem;flex:0 0 auto;
  border-radius:14px;
  font-family:var(--font-display);font-weight:800;font-size:1.05rem;color:#08131d;
  background:linear-gradient(135deg,var(--cyan),var(--orange) 78%);
  box-shadow:0 10px 26px -12px rgba(53,224,208,.9);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{
  font-family:var(--font-display);
  font-size:1.32rem;font-weight:800;letter-spacing:.14em;color:#fff;
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:.66rem;letter-spacing:.2em;color:var(--mist);margin-top:.22rem;
}

.fee-rail{
  grid-column:3;grid-row:1;justify-self:end;
  display:flex;flex-wrap:wrap;gap:.5rem;justify-content:flex-end;
}
.fee-pill{
  display:inline-flex;align-items:baseline;gap:.3rem;
  padding:.42rem .8rem;border-radius:var(--r-pill);
  border:1px solid rgba(53,224,208,.38);
  background:linear-gradient(135deg, rgba(53,224,208,.14), rgba(11,43,69,.35));
  font-size:.78rem;letter-spacing:.05em;color:var(--ice);
  white-space:nowrap;
  transition:transform .2s var(--ease), border-color .2s, background .2s;
}
.fee-pill--alt{
  border-color:rgba(255,107,44,.45);
  background:linear-gradient(135deg, rgba(255,107,44,.16), rgba(11,43,69,.35));
}
.fee-pill:hover,.fee-pill:focus-visible{
  transform:translateY(-2px);
  border-color:var(--cyan);
  background:linear-gradient(135deg, rgba(53,224,208,.24), rgba(11,43,69,.5));
}
.fee-pill__label{color:var(--mist);font-size:.72rem;letter-spacing:.08em}
.fee-pill__num{
  font-family:var(--font-mono);font-weight:700;font-size:.98rem;color:var(--orange);
  font-variant-numeric:tabular-nums;
}
.fee-pill--alt .fee-pill__num{color:var(--cyan)}
.fee-pill__unit{font-family:var(--font-mono);font-size:.68rem;color:var(--mist)}

.nav-toggle{
  grid-column:3;grid-row:1;justify-self:end;
  display:none;align-items:center;gap:.45rem;
  padding:.5rem .8rem;border-radius:var(--r-pill);
  border:1px solid var(--hair-strong);
  color:var(--ice);font-size:.76rem;letter-spacing:.14em;
  transition:border-color .2s, background .2s;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--cyan);background:rgba(53,224,208,.1)}
.nav-toggle__icon{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:18px}
.nav-toggle__icon i{
  display:block;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:transform .3s var(--ease), opacity .2s linear;
}
.nav-toggle__text{font-family:var(--font-mono);font-size:.72rem}
.site-header[data-open] .nav-toggle__icon i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__icon i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__icon i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.nav-band{position:relative}
.site-nav__list{
  display:flex;flex-wrap:wrap;justify-content:center;
  gap:clamp(.3rem,1.8vw,1.9rem);
  padding-block:.45rem;
}
.site-nav__item{display:block}
.site-nav__link{
  position:relative;display:inline-block;
  padding:.55rem .3rem;
  font-size:.94rem;letter-spacing:.1em;color:var(--mist);
  transition:color .2s linear;
}
.site-nav__link::after{
  content:"";position:absolute;left:50%;right:50%;bottom:.18rem;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:left .28s var(--ease), right .28s var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--ice)}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after,
.site-nav__link[aria-current="page"]::after{left:.32rem;right:.32rem}
.site-nav__link[aria-current="page"]{color:#fff;font-weight:700}

.scroll-rail{
  position:absolute;left:0;right:0;bottom:0;height:2px;z-index:2;
  background:rgba(143,179,199,.11);pointer-events:none;
}
.scroll-rail__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:width .12s linear;
}

@media (min-width:900px){
  .nav-band{
    border-top:1px solid rgba(143,179,199,.12);
    background:linear-gradient(180deg, rgba(11,43,69,.34), transparent);
  }
}

@media (max-width:899px){
  .nav-toggle{display:inline-flex}
  .nav-band{
    position:absolute;left:0;right:0;top:100%;
    visibility:hidden;max-height:0;overflow:hidden;
    background:linear-gradient(180deg,#0A2438,#061826 88%);
    border-bottom:1px solid var(--hair);
    box-shadow:0 30px 70px rgba(0,0,0,.6);
    transition:max-height .42s var(--ease), visibility .42s linear;
  }
  .site-header[data-open] .nav-band{
    visibility:visible;
    max-height:min(72vh,34rem);
    overflow-y:auto;
  }
  .nav-band .shell{padding-block:.4rem 1.2rem}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:.1rem;padding-block:0}
  .site-nav__link{
    display:block;padding:.85rem 1rem;border-radius:14px;
    font-size:1rem;letter-spacing:.06em;
    border-bottom:1px solid rgba(143,179,199,.12);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    background:linear-gradient(90deg, rgba(53,224,208,.16), rgba(255,107,44,.07));
    color:#fff;
  }
}

@media (max-width:640px){
  .masthead{
    grid-template-columns:1fr auto 1fr;
    row-gap:.6rem;
    padding-block:.7rem .55rem;
  }
  .brand{gap:.55rem}
  .brand__mark{width:2rem;height:2rem;border-radius:12px;font-size:.92rem}
  .brand__name{font-size:1.1rem;letter-spacing:.1em}
  .brand__tag{font-size:.58rem;letter-spacing:.14em}
  .fee-rail{
    grid-column:1 / -1;grid-row:2;justify-self:stretch;
    justify-content:flex-start;
    overflow-x:auto;padding-bottom:.15rem;
    scrollbar-width:none;
  }
  .fee-rail::-webkit-scrollbar{display:none}
  .fee-pill{flex:0 0 auto}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(3rem,8vw,7rem);
  color:var(--mist);
  background:
    radial-gradient(60rem 26rem at 6% -12%, rgba(53,224,208,.15), transparent 62%),
    radial-gradient(52rem 22rem at 94% -4%, rgba(255,107,44,.13), transparent 66%),
    linear-gradient(180deg,#0B2B45 0%,#08202F 52%,#061826 100%);
  border-top:1px solid rgba(53,224,208,.24);
}
.site-footer::before{
  content:"";position:absolute;left:-12%;right:-12%;bottom:-42%;height:72%;
  background:repeating-radial-gradient(circle at 50% 100%,
    rgba(53,224,208,.11) 0 1px, transparent 1px 46px);
  opacity:.55;pointer-events:none;
}
.site-footer .shell{position:relative;z-index:1}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.65fr) repeat(3,minmax(0,.8fr));
  gap:clamp(1.6rem,4vw,3.5rem);
  padding-block:clamp(2.6rem,6vw,4.6rem) clamp(1.8rem,4vw,3rem);
}

.footer-brand__logo{
  display:inline-block;
  font-family:var(--font-display);font-weight:800;
  font-size:1.5rem;letter-spacing:.16em;color:#fff;
}
.footer-brand__tag{
  margin-top:.5rem;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.2em;color:var(--cyan);
}
.footer-contact{margin-top:1.4rem;display:grid;gap:.65rem;max-width:24rem}
.footer-contact__item{
  display:grid;grid-template-columns:4.6rem 1fr;gap:.7rem;
  font-size:.86rem;line-height:1.6;
}
.footer-contact__label{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;
  color:rgba(143,179,199,.72);padding-top:.16rem;
}
.footer-contact__value{color:rgba(234,246,255,.9);word-break:break-word}

.footer-col__title{
  font-family:var(--font-mono);
  font-size:.72rem;font-weight:600;letter-spacing:.22em;
  color:var(--cyan);text-transform:uppercase;
  padding-bottom:.75rem;margin-bottom:.35rem;
  border-bottom:1px solid var(--hair);
}
.footer-links{display:grid;gap:.1rem}
.footer-link{
  display:inline-block;padding:.34rem 0;
  font-size:.92rem;color:rgba(234,246,255,.82);
  transition:color .2s linear, transform .2s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--orange);transform:translateX(3px)}

.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;
  gap:.8rem 1.5rem;
  padding-block:1.35rem 1.6rem;
  border-top:1px solid var(--hair);
}
.footer-legal{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.05em;
  color:rgba(143,179,199,.85);
}
.footer-note{font-size:.8rem;color:rgba(143,179,199,.7)}

@media (max-width:900px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr;gap:1.8rem}
  .footer-contact__item{grid-template-columns:1fr;gap:.1rem}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* ---------- 通用布局与文字建筑 ---------- */
.section{padding-block:clamp(2.6rem,6.5vw,6rem);position:relative}
.section--canvas{
  background:var(--canvas);
  color:var(--ink);
}
.section--canvas h1,.section--canvas h2,.section--canvas h3,.section--canvas h4{color:var(--ink)}
.section--canvas .eyebrow{color:#0C7C74}
.section--canvas .prose{color:#294559}
.section--canvas .prose strong{color:var(--ink)}

.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--font-mono);
  font-size:.74rem;letter-spacing:.24em;text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";width:1.6rem;height:1px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}
.section-title{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(1.8rem,4vw,3.2rem);line-height:1.1;
  letter-spacing:-.015em;margin:.7rem 0 .8rem;
}

.prose{max-width:38em;font-size:1.05rem;line-height:1.8;color:rgba(234,246,255,.86)}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(1.4rem,2.6vw,2rem);margin-top:1.9em}
.prose h3{font-size:1.18rem;margin-top:1.6em;color:#fff}
.prose ul,.prose ol{display:grid;gap:.55em;padding-left:1.15rem}
.prose ul li{list-style:none;position:relative;padding-left:1rem}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.78em;
  width:.42rem;height:.42rem;border-radius:2px;
  background:linear-gradient(135deg,var(--cyan),var(--orange));
}
.prose ol{counter-reset:prose}
.prose ol li{list-style:decimal;padding-left:.2rem}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--orange)}

.breadcrumb{padding-top:clamp(1rem,3vw,2rem)}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;gap:.4rem;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;
  color:var(--mist);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.4rem}
.breadcrumb__item + .breadcrumb__item::before{content:"／";color:rgba(143,179,199,.45)}
.breadcrumb__link{color:var(--mist);transition:color .2s linear}
.breadcrumb__link:hover,.breadcrumb__link:focus-visible{color:var(--cyan)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.82rem 1.55rem;border-radius:var(--r-pill);
  font-family:var(--font-body);font-size:.94rem;font-weight:700;letter-spacing:.04em;
  border:1px solid transparent;
  transition:transform .2s var(--ease), box-shadow .2s, background .2s, border-color .2s, color .2s;
}
.btn:hover,.btn:focus-visible{transform:translateY(-2px)}
.btn--primary{
  background:linear-gradient(120deg,var(--orange),#FF8F52);
  color:#0A1520;
  box-shadow:0 16px 34px -18px rgba(255,107,44,.95);
}
.btn--primary:hover{box-shadow:0 20px 40px -18px rgba(255,107,44,1)}
.btn--ghost{
  border-color:var(--hair-strong);
  color:var(--ice);
  background:rgba(255,255,255,.03);
}
.btn--ghost:hover{border-color:var(--cyan);background:rgba(53,224,208,.1)}
.btn--quiet{
  border-color:rgba(11,43,69,.22);
  color:var(--ink);
  background:#fff;
}
.btn--quiet:hover{border-color:var(--ink)}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(1rem,3vw,2rem)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

@media (max-width:900px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9{grid-column:span 6}
}
@media (max-width:560px){
  .grid--12{grid-template-columns:1fr}
  .grid--12 > *{grid-column:1 / -1}
}

/* ---------- 面板 / 胶囊 / 数据 ---------- */
.panel{
  border-radius:var(--r-lg);
  padding:clamp(1.2rem,3vw,2.2rem);
  background:linear-gradient(160deg, rgba(11,43,69,.9), rgba(6,24,38,.94));
  border:1px solid var(--hair);
}
.panel--light{
  background:var(--canvas);
  color:var(--ink);
  border-color:rgba(11,43,69,.12);
}
.panel--light h3,.panel--light h4{color:var(--ink)}

.pill{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.26rem .78rem;border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:.72rem;font-weight:600;letter-spacing:.1em;
  border:1px solid currentColor;color:var(--mist);
}
.pill--orange{color:var(--orange);background:rgba(255,107,44,.12)}
.pill--cyan{color:var(--cyan);background:rgba(53,224,208,.12)}
.pill--red{color:var(--red);background:rgba(226,58,58,.14)}
.pill--yellow{color:var(--yellow);background:rgba(244,197,66,.14)}

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

.rule-diag{
  height:1px;border:0;
  background:linear-gradient(90deg,transparent,rgba(53,224,208,.55),rgba(255,107,44,.4),transparent);
  transform:rotate(-1.2deg);transform-origin:left center;
  margin-block:clamp(1.5rem,4vw,3rem);
}

/* ---------- 图片容器基础规则（页面阶段放置占位图） ---------- */
.media-frame{
  position:relative;isolation:isolate;overflow:hidden;
  border-radius:var(--r-lg);
  border:1px solid var(--hair);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(53,224,208,.22), transparent 58%),
    linear-gradient(150deg,#12405F,#061826 76%);
  aspect-ratio:16 / 9;
}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame__img{width:100%;height:100%;object-fit:cover;opacity:.94}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:
    repeating-linear-gradient(115deg, rgba(53,224,208,.10) 0 1px, transparent 1px 26px),
    linear-gradient(180deg, transparent 42%, rgba(6,24,38,.82));
}
.media-frame__caption{
  position:absolute;z-index:2;left:1rem;right:1rem;bottom:.95rem;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;
  text-transform:uppercase;color:rgba(234,246,255,.84);
}

/* ---------- 滚动显现 / 返回顶部 ---------- */
[data-reveal]{transition:opacity .7s var(--ease), transform .7s var(--ease)}
html[data-reveal-ready] [data-reveal]{opacity:0;transform:translateY(18px)}
html[data-reveal-ready] [data-reveal].is-in{opacity:1;transform:none}

.to-top{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:70;
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.62rem .95rem;border-radius:var(--r-pill);
  border:1px solid rgba(53,224,208,.42);
  background:rgba(6,24,38,.9);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  color:var(--ice);font-size:.78rem;letter-spacing:.1em;
  opacity:0;transform:translateY(14px);pointer-events:none;
  transition:opacity .28s linear, transform .28s var(--ease), border-color .2s;
}
.to-top.is-on{opacity:1;transform:none;pointer-events:auto}
.to-top:hover,.to-top:focus-visible{border-color:var(--orange);color:var(--orange)}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html[data-reveal-ready] [data-reveal]{opacity:1;transform:none}
  .to-top{transform:none}
}