/* ===========================================================
   NASA-STYLE · m-nasa.css（手机端独立版）
   =========================================================== */
:root{
  --b:#000;--w:#fff;--paper:#f6f6f6;--ink:#2d2d2d;--gray:#58585b;--gray2:#b9b9bb;
  --line:#d1d1d1;--red:#f64137;--blue:#288bff;--navy:#0b3d91;
  --nav:56px;--safe-t:env(safe-area-inset-top,0px);--safe-b:env(safe-area-inset-bottom,0px);
  --pad:16px;
  --font:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--w);color:var(--ink);font-size:16px;line-height:1.6;overflow-x:hidden}
img,svg,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
::selection{background:var(--red);color:#fff}

/* 顶栏 */
.mn-nav{position:fixed;top:0;left:0;right:0;z-index:90;height:calc(var(--nav) + var(--safe-t));
  padding:var(--safe-t) var(--pad) 0;display:flex;align-items:center;gap:12px;
  background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.mn-logo{display:flex;align-items:center;gap:9px;flex:1;min-width:0}
.mn-logo i{width:34px;height:34px;border-radius:50%;background:var(--navy);display:grid;place-items:center;flex-shrink:0;
  box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.9)}
.mn-logo i svg{width:19px;height:19px}
.mn-logo b{font-size:13.5px;font-weight:800;letter-spacing:.02em;display:block;line-height:1.1}
.mn-logo span{font-size:7.5px;letter-spacing:.24em;color:var(--gray);font-weight:700;display:block;margin-top:2px}
.mn-burger{width:40px;height:40px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:4px}
.mn-burger i{width:19px;height:2px;background:#000;transition:.28s}
.mn-nav.open .mn-burger i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.mn-nav.open .mn-burger i:nth-child(2){opacity:0}
.mn-nav.open .mn-burger i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.mn-menu{position:fixed;top:calc(var(--nav) + var(--safe-t));left:0;right:0;bottom:0;z-index:89;
  background:#fff;display:none;overflow:auto;padding:8px 0 calc(20px + var(--safe-b))}
.mn-menu.open{display:block}
.mn-menu a{display:block;padding:15px var(--pad);font-size:17px;font-weight:600;border-bottom:1px solid var(--line)}
.mn-menu a.on{color:var(--red)}

/* hero */
.mn-hero{position:relative;min-height:74svh;padding:calc(var(--nav) + var(--safe-t) + 40px) var(--pad) 30px;
  display:flex;flex-direction:column;justify-content:flex-end;background:#000;color:#fff;overflow:hidden}
.mn-hero canvas{position:absolute;inset:0;width:100%;height:100%}
.mn-hero-g{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.55),rgba(0,0,0,.1) 35%,rgba(0,0,0,.92))}
.mn-hero-in{position:relative;z-index:2}
.mn-tag{display:inline-flex;align-items:center;gap:7px;font-size:9.5px;letter-spacing:.2em;font-weight:700;margin-bottom:14px}
.mn-tag b{background:var(--red);padding:4px 8px;border-radius:2px}
.mn-hero h1{font-size:clamp(30px,8.6vw,40px);line-height:1.08;font-weight:800;letter-spacing:-.02em}
.mn-hero p{margin-top:14px;font-size:13.5px;color:#dfdfdf;line-height:1.8}
.mn-cta{display:flex;gap:9px;margin-top:20px}
.mn-btn{flex:1;height:46px;display:flex;align-items:center;justify-content:center;gap:7px;border-radius:3px;
  font-size:12.5px;font-weight:700;letter-spacing:.06em}
.mn-btn.red{background:var(--red);color:#fff}
.mn-btn.ghost{border:1px solid rgba(255,255,255,.6);color:#fff}
.mn-btn svg{width:14px;height:14px}

/* 区块 */
.mn-sec{padding:34px 0}
.mn-sec.paper{background:var(--paper)}
.mn-sec.dark{background:#0a0a0a;color:#fff}
.mn-wrap{padding:0 var(--pad)}
.mn-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:18px}
.mn-head h2{font-size:22px;font-weight:800;letter-spacing:-.01em;line-height:1.15}
.mn-head .sub{font-size:11.5px;color:var(--gray);margin-top:6px;line-height:1.6}
.mn-sec.dark .mn-head .sub{color:var(--gray2)}
.mn-more{font-size:10.5px;font-weight:700;letter-spacing:.1em;color:var(--red);white-space:nowrap}

/* 卡片 */
.mn-cards{display:flex;flex-direction:column;gap:20px}
.mn-card{display:block}
.mn-card-m{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:2px;background:#111}
.mn-card-m .ph{position:absolute;inset:0}
.mn-card-tag{position:absolute;left:0;top:0;background:var(--red);color:#fff;font-size:9.5px;font-weight:700;
  letter-spacing:.14em;padding:4px 8px}
.mn-card h3{font-size:18px;font-weight:700;margin-top:11px;line-height:1.3;letter-spacing:-.01em}
.mn-card p{font-size:12.5px;color:var(--gray);line-height:1.7;margin-top:6px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.mn-card time{display:block;margin-top:7px;font-size:10.5px;letter-spacing:.08em;color:var(--gray);text-transform:uppercase}

/* 版块磁贴 */
.mn-tiles{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.mn-tile{position:relative;aspect-ratio:1/1;overflow:hidden;border-radius:2px;background:#111;color:#fff}
.mn-tile .ph{position:absolute;inset:0}
.mn-tile::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(0,0,0,.8))}
.mn-tile-in{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:11px}
.mn-tile-in span{font-size:8.5px;letter-spacing:.18em;color:var(--red);font-weight:700}
.mn-tile-in h3{font-size:15px;font-weight:700;margin-top:3px}
.mn-tile-in p{font-size:10px;color:#c9c9c9;margin-top:2px}

/* 数字 */
.mn-stats{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line)}
.mn-stat{background:#fff;padding:18px 16px}
.mn-stat b{display:block;font-size:28px;font-weight:800;letter-spacing:-.02em;line-height:1}
.mn-stat b small{font-size:11px;color:var(--red);margin-left:3px}
.mn-stat span{display:block;margin-top:7px;font-size:9.5px;letter-spacing:.14em;color:var(--gray)}

/* 订阅 */
.mn-letter{background:var(--navy);color:#fff;padding:30px var(--pad)}
.mn-letter h2{font-size:20px;font-weight:800;line-height:1.3}
.mn-letter p{font-size:12px;color:#c6d4ee;margin-top:8px;line-height:1.7}
.mn-letter form{margin-top:16px;display:flex;flex-direction:column;gap:9px}
.mn-letter input{height:46px;padding:0 14px;border:1px solid rgba(255,255,255,.4);background:rgba(255,255,255,.1);
  color:#fff;font-size:14px;border-radius:2px;outline:none}
.mn-letter input::placeholder{color:rgba(255,255,255,.65)}
.mn-letter .mn-btn{background:var(--red);color:#fff}

/* 页脚 */
.mn-foot{background:#000;color:#fff;padding:28px var(--pad) calc(28px + var(--safe-b))}
.mn-foot .cols{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding-bottom:20px;border-bottom:1px solid rgba(255,255,255,.18)}
.mn-foot h5{font-size:10px;letter-spacing:.18em;margin-bottom:9px;font-weight:700}
.mn-foot a{display:block;padding:5px 0;font-size:12.5px;color:#a9a9a9}
.mn-foot .bot{margin-top:16px;font-size:10px;color:#7d7d7d;line-height:1.8}

/* 板块页 hero */
.mn-shero{position:relative;min-height:56svh;padding:calc(var(--nav) + var(--safe-t) + 34px) var(--pad) 26px;
  display:flex;flex-direction:column;justify-content:flex-end;background:#000;color:#fff;overflow:hidden}
.mn-shero canvas{position:absolute;inset:0;width:100%;height:100%}
.mn-shero-g{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.55),rgba(0,0,0,.15) 38%,rgba(0,0,0,.9))}
.mn-shero-in{position:relative;z-index:2}
.mn-crumb{display:flex;gap:7px;align-items:center;font-size:10px;letter-spacing:.08em;color:#c9c9c9;margin-bottom:12px}
.mn-crumb i{width:10px;height:1px;background:#7a7a7a}
.mn-shero .en{display:block;font-size:9.5px;letter-spacing:.26em;color:var(--red);font-weight:700;margin-bottom:9px}
.mn-shero h1{font-size:clamp(28px,8vw,36px);font-weight:800;letter-spacing:-.02em;line-height:1.06}
.mn-shero p{margin-top:12px;font-size:12.5px;color:#e0e0e0;line-height:1.8}
.mn-chips{display:flex;gap:7px;overflow-x:auto;margin-top:14px;padding-bottom:3px;scrollbar-width:none}
.mn-chips::-webkit-scrollbar{display:none}
.mn-chip{flex-shrink:0;border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:5px 10px;
  font-size:10.5px;color:#efefef;white-space:nowrap}
.mn-chip b{color:#fff}

/* 文章页 */
.mn-ahero{position:relative;min-height:52svh;padding:calc(var(--nav) + var(--safe-t) + 34px) var(--pad) 24px;
  display:flex;flex-direction:column;justify-content:flex-end;background:#000;color:#fff;overflow:hidden}
.mn-ahero canvas{position:absolute;inset:0;width:100%;height:100%}
.mn-ahero-g{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.5),rgba(0,0,0,.15) 35%,rgba(0,0,0,.9))}
.mn-ahero-in{position:relative;z-index:2}
.mn-ahero h1{font-size:clamp(26px,7.6vw,34px);font-weight:800;line-height:1.1;letter-spacing:-.02em}
.mn-ameta{display:flex;gap:14px;flex-wrap:wrap;margin-top:12px;font-size:9.5px;letter-spacing:.12em;color:#cfcfcf}
.mn-ameta b{color:#fff}
.mn-abody{max-width:680px;margin:0 auto;padding:26px var(--pad) 34px}
.mn-lead{font-size:16px;line-height:1.75;font-weight:500;color:#2d2d2d;border-left:4px solid var(--red);padding-left:14px}
.mn-asec{margin-top:26px}
.mn-asec h2{font-size:18px;font-weight:800;margin-bottom:10px;display:flex;gap:6px}
.mn-asec h2 i{color:var(--red);font-style:normal}
.mn-asec p{font-size:14.5px;line-height:1.85;color:#3a3a3a;margin-bottom:11px}
.mn-asec p b{color:#000}
.mn-fig{margin:22px 0;border-radius:2px;overflow:hidden;border:1px solid var(--line)}
.mn-fig .box{position:relative;aspect-ratio:16/9;background:#111}
.mn-fig canvas{position:absolute;inset:0;width:100%;height:100%}
.mn-fig figcaption{padding:8px 10px;font-size:10.5px;color:var(--gray);background:#fff}
.mn-pts{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line)}
.mn-pts div{background:#fff;padding:13px 14px}
.mn-pts b{display:block;font-size:14px;font-weight:700;margin-bottom:4px}
.mn-pts span{font-size:12.5px;color:var(--gray);line-height:1.7}
.mn-mrow{border-bottom:1px solid var(--line);padding:13px 0}
.mn-mrow em{display:block;font-style:normal;font-size:24px;font-weight:800;letter-spacing:-.02em;line-height:1.1}
.mn-mrow b{display:block;font-size:12.5px;font-weight:600;margin-top:3px}
.mn-mrow span{display:block;font-size:11.5px;color:var(--gray);margin-top:3px;line-height:1.6}
.mn-tl{border-left:2px solid var(--line);padding-left:16px}
.mn-tl .it{position:relative;padding-bottom:18px}
.mn-tl .it::before{content:"";position:absolute;left:-22px;top:5px;width:8px;height:8px;border-radius:50%;
  background:#fff;border:2px solid var(--red)}
.mn-tl b{font-size:10px;letter-spacing:.16em;color:var(--red)}
.mn-tl h4{font-size:14.5px;font-weight:700;margin:3px 0 2px}
.mn-tl p{font-size:12.5px;color:var(--gray);line-height:1.7;margin:0}
.mn-next{display:flex;flex-direction:column;gap:9px;margin-top:24px}
.mn-next a{display:flex;flex-direction:column;gap:3px;padding:13px 14px;border:1px solid var(--line);background:var(--paper)}
.mn-next span{font-size:9.5px;letter-spacing:.14em;color:var(--gray)}
.mn-next b{font-size:14px;font-weight:700}

@media (min-width:640px){
  .mn-wrap,.mn-abody{max-width:620px;margin:0 auto}
  .mn-hero-in,.mn-shero-in,.mn-ahero-in{max-width:620px;margin:0 auto;width:100%}
}