/* ============================================================
   KC漫画 - 太空漫游主题
   深空蓝 · 宇航白 · 浅蓝 · 暖橙
   ============================================================ */
:root{
  --space:#0C1626;          /* 深空底 */
  --space-2:#13233E;       /* 深空卡 */
  --space-3:#1B3152;       /* 深空亮面 */
  --cloud:#F2F7FC;         /* 宇航白 */
  --sky:#7EC8E3;           /* 浅蓝 */
  --sky-deep:#3FA9C9;
  --orange:#FF9F43;        /* 暖橙 */
  --cyan:#4FD1C5;          /* 荧光青 */
  --ink:#16243C;
  --line:rgba(22,36,60,.12);
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --shadow:0 14px 34px rgba(12,22,38,.14);
  --glow:0 0 30px rgba(127,200,227,.25);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:auto;scroll-padding-top:78px}
body{
  font-family:var(--sans);
  background:var(--cloud);
  color:var(--ink);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

.skip-link{
  position:fixed;left:-9999px;top:0;z-index:2000;
  background:var(--orange);color:#fff;padding:10px 18px;border-radius:0 0 8px 0;
}
.skip-link:focus{left:0}

/* ---------------- 顶栏 ---------------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(12,22,38,.9);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(127,200,227,.18);
}
.header-inner{
  max-width:1180px;margin:0 auto;padding:12px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{width:42px;height:42px;border-radius:50%;border:2px solid rgba(127,200,227,.4)}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text strong{
  font-size:21px;font-weight:900;color:#fff;letter-spacing:1px;
}
.brand-text small{font-size:10px;color:rgba(255,255,255,.55);letter-spacing:3px;text-transform:uppercase}
.main-nav{display:flex;align-items:center;gap:26px}
.nav-link{
  font-size:15px;font-weight:500;color:rgba(255,255,255,.82);
  padding:6px 2px;position:relative;transition:color .2s;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;
  background:var(--orange);transition:right .25s;
}
.nav-link:hover{color:#fff}
.nav-link:hover::after{right:0}
.nav-link.active{color:#fff}
.nav-link.active::after{right:0}
.nav-cta{
  color:#fff;background:linear-gradient(120deg,var(--orange),#FF6B6B);
  padding:9px 22px;border-radius:999px;font-weight:700;
  box-shadow:0 8px 22px rgba(255,159,67,.35);transition:transform .2s,filter .2s;
}
.nav-cta::after{display:none}
.nav-cta:hover{filter:brightness(1.08);transform:translateY(-1px)}
.menu-toggle{display:none;background:none;border:0;padding:8px}
.menu-toggle span{
  display:block;width:22px;height:2px;background:#fff;margin:5px 0;
  transition:transform .25s,opacity .25s;
}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------------- Hero ---------------- */
.hero{
  position:relative;
  background:
    radial-gradient(circle at 80% 15%, rgba(127,200,227,.16), transparent 46%),
    radial-gradient(circle at 10% 85%, rgba(79,209,197,.10), transparent 40%),
    var(--space);
  color:#fff;overflow:hidden;
}
.hero-stars{
  position:absolute;inset:0;pointer-events:none;opacity:.7;
  background-image:
    radial-gradient(1.5px 1.5px at 12% 22%, #fff, transparent),
    radial-gradient(1px 1px at 28% 68%, #cfe9ff, transparent),
    radial-gradient(1.5px 1.5px at 42% 18%, #fff, transparent),
    radial-gradient(1px 1px at 58% 76%, #cfe9ff, transparent),
    radial-gradient(1.5px 1.5px at 72% 30%, #fff, transparent),
    radial-gradient(1px 1px at 86% 62%, #cfe9ff, transparent),
    radial-gradient(1px 1px at 18% 48%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 64% 8%, #fff, transparent),
    radial-gradient(1px 1px at 92% 42%, #cfe9ff, transparent),
    radial-gradient(1px 1px at 34% 88%, #fff, transparent);
  background-size:100% 100%;
}
.hero-inner{
  max-width:1180px;margin:0 auto;padding:70px 24px 78px;
  display:grid;grid-template-columns:1.05fr 1fr;gap:44px;align-items:center;
  position:relative;z-index:1;
}
.hero-eyebrow{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:3px;
  color:var(--sky);background:rgba(127,200,227,.1);
  border:1px solid rgba(127,200,227,.35);
  padding:6px 16px;border-radius:999px;margin-bottom:18px;
}
.hero-title{
  font-size:clamp(46px,6.6vw,76px);font-weight:900;line-height:1.06;letter-spacing:1px;
}
.hero-title .hl{
  background:linear-gradient(120deg,var(--sky),var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{
  margin:20px 0 30px;font-size:17px;color:rgba(255,255,255,.78);max-width:31em;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 28px;border-radius:999px;font-size:16px;font-weight:700;
  transition:transform .2s,box-shadow .2s,background .2s;border:0;
}
.btn svg{flex:none}
.btn-primary{
  background:linear-gradient(120deg,var(--orange),#FF6B6B);color:#fff;
  box-shadow:0 10px 28px rgba(255,159,67,.4);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(255,159,67,.5)}
.btn-ghost{
  background:rgba(255,255,255,.08);color:#fff;border:1.5px solid rgba(255,255,255,.28);
}
.btn-ghost:hover{border-color:var(--sky);color:var(--sky)}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,auto);gap:10px;
  margin-top:42px;padding-top:30px;border-top:1px dashed rgba(255,255,255,.2);
  justify-content:start;
}
.hero-stats>div{text-align:left}
.hero-stats dt{font-size:12px;color:rgba(255,255,255,.6)}
.hero-stats dd{
  font-size:28px;font-weight:900;color:#fff;margin-top:2px;
  font-variant-numeric:tabular-nums;
}
.hero-stats dd::after{content:"";display:block;width:22px;height:3px;background:var(--orange);border-radius:2px;margin-top:4px}
.hero-art{position:relative}
.hero-art::before{
  content:"";position:absolute;inset:-12px;border-radius:50%;
  border:1.5px dashed rgba(127,200,227,.35);animation:spin 36s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.hero-art-main{
  width:100%;border-radius:24px;box-shadow:0 20px 60px rgba(0,0,0,.45), var(--glow);
  border:3px solid rgba(127,200,227,.35);
  aspect-ratio:16/9;object-fit:cover;
}
.hero-sticker{
  position:absolute;top:-12px;right:-6px;
  background:var(--orange);color:#fff;font-size:14px;font-weight:700;
  padding:9px 16px;border-radius:999px;box-shadow:0 8px 20px rgba(255,159,67,.5);
  transform:rotate(3deg);letter-spacing:1px;
}

/* ---------------- 通用 section ---------------- */
.section-block{padding:76px 24px}
.section-block>*{max-width:1180px;margin-left:auto;margin-right:auto}
.section-head{margin-bottom:38px}
.section-head .kicker{
  display:block;font-size:12px;font-weight:700;letter-spacing:4px;
  color:var(--sky-deep);margin-bottom:8px;
}
.section-head h2{
  font-size:clamp(28px,3.6vw,38px);font-weight:900;letter-spacing:1px;
}
.section-desc{margin-top:10px;color:#5b6b83;font-size:15px;max-width:34em}

/* ---------------- 星际榜单 ---------------- */
.rank{background:var(--space);color:#fff}
.rank .section-head .kicker{color:var(--sky)}
.rank .section-desc{color:rgba(255,255,255,.6)}
.rank-list{list-style:none;display:flex;flex-direction:column;gap:14px}
.rank-item{
  display:flex;align-items:center;gap:20px;
  background:linear-gradient(90deg,rgba(127,200,227,.1),rgba(12,22,38,0));
  border:1px solid rgba(127,200,227,.16);border-radius:16px;
  padding:13px 20px;transition:transform .2s,border-color .2s,background .2s;
}
.rank-item:hover{
  transform:translateX(6px);border-color:rgba(255,159,67,.45);
  background:linear-gradient(90deg,rgba(127,200,227,.16),rgba(12,22,38,0));
}
.rank-num{
  font-size:34px;font-weight:900;font-style:italic;
  color:var(--space-3);-webkit-text-stroke:1.5px var(--sky);
  min-width:60px;text-align:center;line-height:1;
}
.rank-item:first-child .rank-num{-webkit-text-stroke:1.5px var(--orange);color:rgba(255,159,67,.15);text-shadow:0 0 18px rgba(255,159,67,.45)}
.rank-cover{
  width:54px;height:72px;border-radius:8px;overflow:hidden;flex:none;
  border:1px solid rgba(127,200,227,.3);
}
.rank-cover img{width:100%;height:100%;object-fit:cover;object-position:center 38%}
.rank-info{flex:1;min-width:0}
.rank-info h3{
  font-size:18px;font-weight:800;color:#fff;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.rank-info p{font-size:13px;color:rgba(255,255,255,.55);margin:2px 0 8px}
.rank-bar{
  height:6px;border-radius:4px;background:rgba(255,255,255,.1);overflow:hidden;max-width:420px;
}
.rank-bar i{
  display:block;height:100%;border-radius:4px;
  background:linear-gradient(90deg,var(--sky),var(--cyan));
}
.rank-tag{font-size:12.5px;font-weight:700;flex:none;color:var(--sky)}
.rank-tag.first{color:var(--orange)}

/* ---------------- 漫游指南 ---------------- */
.guide{background:var(--cloud)}
.guide-steps{
  list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step;
}
.guide-step{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:30px 24px 26px;box-shadow:var(--shadow);
  transition:transform .25s;
}
.guide-step:hover{transform:translateY(-6px)}
.guide-step::before{
  content:"";position:absolute;top:36px;right:-14px;width:22px;height:2px;
  background:var(--sky);opacity:.6;
}
.guide-step:last-child::before{display:none}
.guide-no{
  display:inline-block;font-size:13px;font-weight:900;letter-spacing:2px;
  color:#fff;background:linear-gradient(120deg,var(--sky-deep),var(--sky));
  padding:5px 12px;border-radius:8px;margin-bottom:16px;
}
.guide-step h3{font-size:18px;font-weight:800;margin-bottom:8px}
.guide-step p{font-size:14px;color:#5b6b83}

/* ---------------- 能量补给 ---------------- */
.power{background:var(--space);color:#fff}
.power .section-head .kicker{color:var(--cyan)}
.power .section-desc{color:rgba(255,255,255,.6)}
.power-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.power-card{
  background:linear-gradient(160deg,var(--space-3),var(--space-2));
  border:1px solid rgba(127,200,227,.18);border-radius:16px;
  padding:30px 24px;text-align:left;
  transition:transform .25s,border-color .25s;
}
.power-card:hover{transform:translateY(-6px);border-color:rgba(79,209,197,.5)}
.power-card svg{color:var(--cyan);margin-bottom:16px}
.power-card h3{font-size:18px;font-weight:800;color:#fff;margin-bottom:8px}
.power-card p{font-size:14px;color:rgba(255,255,255,.62)}

/* ---------------- 异界入口 ---------------- */
.portal{background:var(--cloud)}
.portal-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:22px;
}
.portal-card{
  position:relative;aspect-ratio:3/3.4;border-radius:18px;overflow:hidden;
  border:2px solid #fff;box-shadow:var(--shadow);display:block;
}
.portal-card img{
  width:100%;height:100%;object-fit:cover;object-position:center 40%;
  transition:transform .5s;
}
.portal-card:hover img{transform:scale(1.06)}
.portal-card::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(12,22,38,0) 45%,rgba(12,22,38,.72) 100%);
}
.portal-name{
  position:absolute;left:16px;bottom:16px;z-index:2;color:#fff;
  font-size:17px;font-weight:800;letter-spacing:2px;
  padding:6px 14px;border-radius:999px;
  background:var(--accent);box-shadow:0 6px 16px rgba(12,22,38,.4);
}

/* ---------------- 下载区 ---------------- */
.download{
  background:
    radial-gradient(circle at 20% 30%, rgba(79,209,197,.12), transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(255,159,67,.14), transparent 42%),
    var(--space);
  color:#fff;position:relative;overflow:hidden;
}
.download-inner{
  max-width:1180px;margin:0 auto;padding:72px 24px;
  display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:center;
  position:relative;z-index:1;
}
.download h2{
  font-size:clamp(28px,3.6vw,42px);font-weight:900;letter-spacing:1px;margin-bottom:12px;
}
.download-copy>p{font-size:16px;opacity:.82;margin-bottom:26px;max-width:30em}
.btn-download{
  background:linear-gradient(120deg,var(--orange),#FF6B6B);color:#fff;
  font-size:18px;padding:15px 38px;
  box-shadow:0 14px 34px rgba(255,159,67,.42);
}
.btn-download:hover{transform:translateY(-2px)}
.download-tip{font-size:13px;opacity:.55;margin-top:16px !important;margin-bottom:0 !important}
.download-collage{
  display:grid;grid-template-columns:1fr 1fr;gap:14px;
}
.download-collage img{
  width:100%;aspect-ratio:3/4;object-fit:cover;object-position:center 40%;
  border-radius:14px;border:3px solid rgba(127,200,227,.3);
  box-shadow:var(--glow);
}
.download-collage img:nth-child(1){transform:rotate(-3deg)}
.download-collage img:nth-child(2){transform:rotate(2deg) translateY(10px)}
.download-collage img:nth-child(3){transform:rotate(2deg) translateY(-6px)}
.download-collage img:nth-child(4){transform:rotate(-2deg)}

/* ---------------- FAQ ---------------- */
.faq{background:var(--cloud)}
.faq-list{max-width:820px;display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow);overflow:hidden;
}
.faq-item summary{
  list-style:none;display:flex;justify-content:space-between;align-items:center;
  padding:18px 22px;font-weight:700;cursor:pointer;font-size:16.5px;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-ico{
  width:22px;height:22px;border-radius:50%;flex:none;position:relative;
  background:rgba(63,169,201,.12);transition:background .2s,transform .3s;
}
.faq-ico::before,.faq-ico::after{
  content:"";position:absolute;background:var(--sky-deep);border-radius:2px;
}
.faq-ico::before{left:6px;right:6px;top:10px;height:2px}
.faq-ico::after{top:6px;bottom:6px;left:10px;width:2px}
.faq-item[open] summary .faq-ico{transform:rotate(45deg);background:rgba(63,169,201,.2)}
.faq-item[open] summary{color:var(--sky-deep)}
.faq-item p{padding:0 22px 20px;font-size:14.5px;color:#5b6b83;max-width:60em}

/* ---------------- 页脚 ---------------- */
.site-footer{background:#081120;color:rgba(242,247,252,.8)}
.footer-inner{
  max-width:1180px;margin:0 auto;padding:52px 24px 36px;
  display:grid;grid-template-columns:1.2fr 1fr;gap:44px;
}
.footer-brand{display:flex;gap:14px;align-items:flex-start}
.footer-logo{width:52px;height:52px;border-radius:50%;border:2px solid rgba(127,200,227,.35)}
.footer-name{font-size:20px;font-weight:900;color:#fff;margin-bottom:6px;letter-spacing:1px}
.footer-desc{font-size:13.5px;opacity:.7;max-width:26em}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.footer-col h4{font-size:14px;color:#fff;margin-bottom:12px;font-weight:700}
.footer-col a{display:block;font-size:13.5px;opacity:.72;margin-bottom:8px;transition:opacity .2s}
.footer-col a:hover{opacity:1;color:var(--sky)}
.footer-col p{font-size:13.5px;opacity:.72;margin-bottom:8px}
.footer-bottom{
  border-top:1px solid rgba(127,200,227,.12);padding:18px 24px;text-align:center;
}
.footer-bottom p{font-size:12.5px;opacity:.5}

/* ---------------- 回到顶部 ---------------- */
.back-top{
  position:fixed;right:22px;bottom:26px;z-index:90;
  width:46px;height:46px;border-radius:50%;border:0;
  background:linear-gradient(120deg,var(--orange),#FF6B6B);color:#fff;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 26px rgba(255,159,67,.45);
  opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;
}
.back-top.show{opacity:1;pointer-events:auto}
.back-top:hover{transform:translateY(-3px)}

/* ---------------- 响应式 ---------------- */
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:38px;padding:52px 24px 60px}
  .hero-art{max-width:560px}
  .hero-stats{justify-content:space-between}
  .guide-steps{grid-template-columns:repeat(2,1fr)}
  .guide-step::before{display:none}
  .power-grid{grid-template-columns:repeat(2,1fr)}
  .portal-grid{grid-template-columns:repeat(2,1fr)}
  .download-inner{grid-template-columns:1fr;gap:34px}
  .download-collage{max-width:420px}
  .footer-inner{grid-template-columns:1fr;gap:32px}
  .footer-links{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:640px){
  html{scroll-padding-top:62px}
  .header-inner{padding:10px 16px}
  .main-nav{
    position:fixed;inset:0 0 auto 0;top:0;padding:84px 24px 28px;
    background:var(--space);flex-direction:column;align-items:stretch;gap:6px;
    transform:translateY(-105%);transition:transform .3s;z-index:150;
    box-shadow:0 20px 40px rgba(0,0,0,.3);
  }
  .main-nav.open{transform:translateY(0)}
  .nav-link{padding:12px 4px;font-size:16px;border-bottom:1px solid rgba(127,200,227,.14);color:#fff}
  .nav-cta{text-align:center;margin-top:10px;border-bottom:0}
  .menu-toggle{display:block;z-index:200;position:relative}
  .hero-title{font-size:46px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:16px}
  .hero-stats>div{text-align:center}
  .hero-stats dd::after{margin-left:auto;margin-right:auto}
  .section-block{padding:56px 16px}
  .guide-steps{grid-template-columns:1fr}
  .power-grid{grid-template-columns:1fr}
  .portal-grid{grid-template-columns:1fr}
  .rank-item{gap:12px;padding:12px 14px;flex-wrap:wrap}
  .rank-num{min-width:44px;font-size:28px}
  .rank-tag{width:100%;padding-left:76px}
  .download-collage{max-width:320px}
  .footer-links{grid-template-columns:1fr;gap:24px}
  .footer-bottom p{font-size:11.5px}
  .back-top{right:16px;bottom:20px}
}