:root{
  --bg: #0a0a0a;
  --fg: #f6f6f6;
  --muted: rgba(246,246,246,.7);
  --muted2: rgba(246,246,246,.5);
  --line: rgba(246,246,246,.18);

  --panel: rgba(0,0,0,.30);
  --panel2: rgba(255,255,255,.08);

  --radius: 18px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);

  --max: 1160px;

  /* “右侧多留白”的关键：内容区宽度 + 右侧空列比例 */
  --left-col: 74%;
  --right-col: 26%;

  --header-h: 64px;
}

/* Base */
*{ box-sizing: border-box; }
html,body{ height: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: .2px;
  overflow-x: hidden;
}
a{ color: inherit; text-decoration: none; }
button{ font: inherit; color: inherit; background: transparent; border: none; cursor: pointer; }
:focus-visible{ outline: 2px solid rgba(255,255,255,.6); outline-offset: 3px; border-radius: 10px; }

.site-main{ padding-top: var(--header-h); }

/* Header */
.site-header{
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  background: linear-gradient(to bottom, rgba(0,0,0,.55), rgba(0,0,0,.05));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.header-inner{
  max-width: calc(var(--max) + 80px);
  height: 100%;
  margin: 0 auto;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand{
  display: inline-flex;
  gap: 10px;
  align-items: center;
  font-weight: 700;
  letter-spacing: .9px;
}
.brand-mark{
  width: 22px; height: 22px;
  display: grid; place-items: center;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px;
  font-size: 12px;
}
.brand-name{ font-size: 13px; opacity: .92; }

.nav{
  display: flex;
  align-items: center;
  gap: 18px;
}
.nav-link{
  font-size: 13px;
  opacity: .86;
  padding: 10px 10px;
  border-radius: 12px;
}
.nav-link:hover{ opacity: 1; background: rgba(255,255,255,.06); }
.nav-login{
  border: 1px solid rgba(255,255,255,.22);
  padding: 9px 12px;
}

/* Language dropdown */
.lang{ position: relative; }
.lang-btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  opacity: .86;
  padding: 10px 10px;
  border-radius: 12px;
}
.lang-btn:hover{ opacity: 1; background: rgba(255,255,255,.06); }
.lang-pill{
  font-size: 12px;
  border: 1px solid rgba(255,255,255,.22);
  padding: 2px 8px;
  border-radius: 999px;
  opacity: .9;
}
.lang-menu{
  position: absolute;
  top: 48px; right: 0;
  width: 180px;
  background: rgba(10,10,10,.85);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  padding: 8px;
  box-shadow: var(--shadow);
  display: none;
}
.lang-menu.open{ display: block; }
.lang-item{
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 13px;
  opacity: .9;
}
.lang-item:hover{ background: rgba(255,255,255,.08); }

/* Mobile */
.hamburger{ display: none; width: 44px; height: 44px; border-radius: 14px; }
.hamburger:hover{ background: rgba(255,255,255,.06); }
.hamburger span{
  display: block;
  width: 18px; height: 2px;
  margin: 5px auto;
  background: rgba(255,255,255,.85);
  border-radius: 2px;
}
.mobile-menu{
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 0; right: 0;
  background: rgba(10,10,10,.92);
  border-bottom: 1px solid rgba(255,255,255,.10);
  padding: 14px 18px 18px;
}
.mobile-menu.open{ display: block; }
.mobile-link{
  display: block;
  padding: 12px 10px;
  border-radius: 14px;
  opacity: .92;
}
.mobile-link:hover{ background: rgba(255,255,255,.06); }
.mobile-lang{ padding: 10px; }
.mobile-lang-title{ font-size: 12px; opacity: .7; margin-bottom: 10px; }
.mobile-lang-actions{ display: flex; gap: 10px; }
.mobile-lang-btn{
  border: 1px solid rgba(255,255,255,.22);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  opacity: .9;
}

/* Right floating buttons */
.float-right{
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn{
  position: relative;
  width: 46px; height: 46px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.14);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 24px rgba(0,0,0,.35);
}
.float-btn:hover{ background: rgba(255,255,255,.12); }
.float-icon{ font-size: 12px; font-weight: 700; opacity: .92; }
.float-tip{
  position: absolute;
  right: 54px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(10,10,10,.88);
  border: 1px solid rgba(255,255,255,.14);
  padding: 8px 10px;
  border-radius: 12px;
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity .18s ease;
}
.float-btn:hover .float-tip{ opacity: 1; }

/* Sticky bottom-center overlay */
.sticky-overlay{
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 11vh; /* “中间偏底部” */
  z-index: 950;
  width: min(760px, calc(100% - 34px));
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.sticky-overlay.show{
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.overlay-inner{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border-radius: 999px;
  background: rgba(10,10,10,.62);
  border: 1px solid rgba(255,255,255,.16);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}
.overlay-title{
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .6px;
}
.overlay-sub{
  font-size: 12px;
  opacity: .72;
  margin-top: 2px;
}
.overlay-right{
  display: flex;
  align-items: center;
  gap: 12px;
}
.overlay-progress{
  font-size: 12px;
  opacity: .85;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.14);
}
.overlay-cta{
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.22);
  background: rgba(255,255,255,.06);
  font-size: 13px;
}
.overlay-cta:hover{ background: rgba(255,255,255,.10); }

/* HERO */
.hero{
  min-height: calc(100vh - var(--header-h));
  display: grid;
  align-items: center;
  position: relative;
  background: #111;
  isolation: isolate;
}
.hero::before{
  content:"";
  position: absolute;
  inset: 0;
  background-image: var(--bgimg);
  background-size: cover;
  background-position: center;
  filter: saturate(1.05) contrast(1.02);
  z-index: -2;
}
.hero::after{
  content:"";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0,0,0,.62) 0%, rgba(0,0,0,.35) 55%, rgba(0,0,0,.18) 100%);
  z-index: -1;
}
.hero-grid{
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 70px 22px 50px;
  width: 100%;
  display: grid;
  grid-template-columns: var(--left-col) var(--right-col); /* 右侧留白 */
  gap: 0;
  align-items: center;
}
.hero-copy{
  max-width: 720px;
}
.hero-title{
  font-size: clamp(34px, 4.4vw, 64px);
  line-height: 1.02;
  margin: 0 0 14px;
  letter-spacing: .6px;
}
.hero-subtitle{
  margin: 0 0 22px;
  font-size: clamp(14px, 1.5vw, 18px);
  color: var(--muted);
  max-width: 540px;
}
.hero-actions{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.18);
  font-size: 13px;
  letter-spacing: .2px;
}
.btn-primary{
  background: rgba(255,255,255,.10);
}
.btn-primary:hover{ background: rgba(255,255,255,.16); }
.btn-ghost{
  background: transparent;
}
.btn-ghost:hover{ background: rgba(255,255,255,.06); }

.hero-hint{
  position: absolute;
  left: 22px;
  bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  opacity: .78;
}
.hint-dot{
  width: 28px;
  height: 1px;
  background: rgba(255,255,255,.55);
  position: relative;
}
.hint-dot::after{
  content:"";
  position: absolute;
  right: 0;
  top: -3px;
  width: 6px;
  height: 6px;
  border: 1px solid rgba(255,255,255,.7);
  border-radius: 999px;
}

/* Ads strip */
.ads-strip{
  padding: 26px 0;
  border-top: 1px solid rgba(255,255,255,.06);
  border-bottom: 1px solid rgba(255,255,255,.06);
  background: rgba(255,255,255,.03);
}
.ads-inner{
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 0 22px;
  display: grid;
  gap: 8px;
}
.ads-title{ font-weight: 700; letter-spacing: .6px; }
.ads-desc{ color: var(--muted); font-size: 13px; }
.ads-link{ font-size: 13px; opacity: .9; }
.ads-link:hover{ opacity: 1; text-decoration: underline; }

/* Slides container */
.slides-wrap{
  position: relative;
  background: #0b0b0b;
}
.slides{
  height: 100vh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  overscroll-behavior: contain;
  scrollbar-width: none;
}
.slides::-webkit-scrollbar{ width: 0; height: 0; }

.slide{
  min-height: 100vh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  position: relative;
  display: grid;
  align-items: center;
  isolation: isolate;
}
.slide::before{
  content:"";
  position: absolute;
  inset: 0;
  background-image: var(--bgimg);
  background-size: cover;
  background-position: center;
  z-index: -2;
}
.slide::after{
  content:"";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0,0,0,.62) 0%, rgba(0,0,0,.38) 58%, rgba(0,0,0,.14) 100%);
  z-index: -1;
}

.slide-grid{
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 70px 22px 50px;
  width: 100%;
  display: grid;
  grid-template-columns: var(--left-col) var(--right-col); /* 右侧留白 */
  gap: 0;
  align-items: center;
}
.slide-copy{
  max-width: 680px;
  transform: translateY(6px);
  opacity: 0;
  transition: transform .6s ease, opacity .6s ease;
}
.slide.is-active .slide-copy{
  transform: translateY(0);
  opacity: 1;
}
.slide-kicker{
  font-size: 12px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  opacity: .72;
  margin-bottom: 10px;
}
.slide-title{
  margin: 0 0 12px;
  font-size: clamp(26px, 3.1vw, 44px);
  line-height: 1.06;
  letter-spacing: .5px;
}
.slide-text{
  margin: 0;
  color: var(--muted);
  font-size: clamp(13px, 1.4vw, 16px);
  max-width: 520px;
}

/* Login strip */
.login-strip{
  padding: 70px 0;
  border-top: 1px solid rgba(255,255,255,.06);
  background: rgba(255,255,255,.02);
}
.login-inner{
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 0 22px;
}
.login-title{ margin: 0 0 8px; letter-spacing: .5px; }
.login-desc{ margin: 0 0 18px; color: var(--muted); }

/* Footer */
.site-footer{
  border-top: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.02);
}
.footer-inner{
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 40px 22px 26px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 18px;
}
.footer-head{
  font-weight: 700;
  letter-spacing: .6px;
  margin-bottom: 10px;
}
.footer-text{ color: var(--muted); font-size: 13px; max-width: 320px; }
.footer-link{
  display: block;
  padding: 6px 0;
  color: rgba(255,255,255,.80);
  font-size: 13px;
}
.footer-link:hover{ text-decoration: underline; }
.footer-mini{ margin-top: 10px; font-size: 12px; color: var(--muted2); }

.footer-bottom{
  max-width: calc(var(--max) + 80px);
  margin: 0 auto;
  padding: 14px 22px 26px;
  color: var(--muted2);
  font-size: 12px;
  border-top: 1px solid rgba(255,255,255,.06);
}

/* Responsive */
@media (max-width: 980px){
  :root{
    --left-col: 100%;
    --right-col: 0%;
  }
  .hero-grid, .slide-grid{ grid-template-columns: 1fr; }
  .hero-whitespace, .slide-whitespace{ display: none; }
  .footer-inner{ grid-template-columns: 1fr 1fr; }
  .float-right{ right: 12px; }
}

@media (max-width: 760px){
  .nav-link, .lang{ display: none; }
  .hamburger{ display: inline-flex; align-items: center; justify-content: center; }
  .overlay-inner{ border-radius: 18px; }
  .overlay-sub{ display: none; } /* 手机上更干净 */
  .float-tip{ display: none; }
  .footer-inner{ grid-template-columns: 1fr; }
}