/* ============================================================
   jmmanhuer.cn · JM天堂 深夜藏书阁
   骨架E：吸顶极简细导航(带淡投影) + 窄栏居中叙事(720px)
         + 门形hero(拱门内三图) + 走廊分隔条 + 三闸机下载 + 灯下弹幕纵列
   配色：深蓝黑 #0d1420 / 霓虹橙红 #ff5a2b(logo主色) / 亮橙 #ffa14e / 天蓝 #6cc3e8 / 月白 #f2f6fa
   ============================================================ */
:root{
  --night:#0d1420;
  --night2:#141d2c;
  --neon:#ff5a2b;
  --neon2:#ffa14e;
  --sky:#6cc3e8;
  --moon:#f2f6fa;
  --moon2:rgba(242,246,250,.72);
  --muted:rgba(242,246,250,.5);
  --line:rgba(242,246,250,.12);
  --sans:'Noto Sans SC',sans-serif;
  --serif:'Noto Serif SC',serif;
  --en:'Cinzel',serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--night);color:var(--moon);line-height:1.8;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;border:0;background:none;cursor:pointer}

/* ---------- 吸顶极简细导航（带淡投影） ---------- */
.topline{position:sticky;top:0;z-index:950;display:flex;align-items:center;gap:28px;background:rgba(13,20,32,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);box-shadow:0 4px 16px rgba(0,0,0,.35);padding:12px 30px}
.tl-brand{display:flex;align-items:center;gap:10px;flex:none}
.tl-brand img{width:34px;height:34px;border-radius:50%;box-shadow:0 0 0 2px rgba(255,90,43,.55),0 0 14px rgba(255,90,43,.4)}
.tl-brand span{font-family:var(--serif);font-weight:900;font-size:19px;color:var(--moon);letter-spacing:.08em}
.tl-brand i{font-style:normal;color:var(--neon)}
.tl-nav{display:flex;gap:24px;margin-left:auto}
.tl-nav a{font-size:14.5px;color:var(--moon2);padding:5px 2px;border-bottom:2px solid transparent;transition:.25s}
.tl-nav a:hover{color:var(--neon2);border-bottom-color:var(--neon)}
.tl-cta{background:var(--neon);color:#fff;font-weight:700;font-size:14px;padding:10px 22px;border-radius:999px;box-shadow:0 0 18px rgba(255,90,43,.45);transition:.25s;flex:none}
.tl-cta:hover{background:#e04a1e;transform:translateY(-2px)}
.tl-toggle{display:none;flex-direction:column;gap:5px;padding:8px;margin-left:auto}
.tl-toggle span{width:22px;height:2px;background:var(--moon);border-radius:2px}
.m-menu{display:none;position:sticky;top:59px;z-index:940;background:var(--night2);border-bottom:1px solid var(--line);box-shadow:0 10px 24px rgba(0,0,0,.4)}
.m-menu a{display:block;padding:14px 24px;color:var(--moon2);border-bottom:1px dashed var(--line)}
.m-menu .m-cta{color:var(--neon2);font-weight:700;border-bottom:0}

/* ---------- hero：窄栏居中 门形 ---------- */
.hero{max-width:760px;margin:0 auto;padding:78px 22px 50px;text-align:center}
.g-kicker{font-family:var(--en);font-weight:700;font-size:13px;letter-spacing:.34em;color:var(--sky);margin-bottom:20px}
.g-title{font-family:var(--serif);font-weight:900;font-size:clamp(56px,9vw,96px);line-height:1.1;letter-spacing:.06em;text-shadow:0 0 34px rgba(255,90,43,.35)}
.g-title span{color:var(--neon)}
.g-sub{margin-top:14px;font-size:clamp(14px,1.8vw,17px);font-weight:700;letter-spacing:.3em;color:var(--sky)}
.g-slogan{margin-top:24px;font-family:var(--serif);font-weight:900;font-size:clamp(18px,2.3vw,24px);color:var(--moon)}
.g-lead{margin:14px auto 0;font-size:15px;color:var(--moon2);max-width:58ch}
.g-cta{margin-top:30px;display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.btn-main{display:inline-block;background:var(--neon);color:#fff;font-weight:700;font-size:16px;padding:15px 36px;border-radius:999px;box-shadow:0 0 26px rgba(255,90,43,.5);transition:.25s}
.btn-main:hover{background:#e04a1e;transform:translateY(-2px)}
.btn-ghost{display:inline-block;border:1.5px solid rgba(242,246,250,.45);color:var(--moon);font-weight:700;font-size:15px;padding:14px 30px;border-radius:999px;transition:.25s}
.btn-ghost:hover{border-color:var(--sky);color:var(--sky)}
.g-note{margin-top:14px;font-size:12.5px;color:var(--muted);letter-spacing:.06em}

/* 门形：拱门框 + 三图 */
.door{margin:44px auto 0;position:relative;width:100%;max-width:620px;padding:34px 34px 0}
.door-arch{position:absolute;inset:0;bottom:26px;border:3px solid rgba(255,90,43,.65);border-bottom:0;border-radius:310px 310px 0 0;box-shadow:0 0 30px rgba(255,90,43,.25) inset,0 0 24px rgba(255,90,43,.18)}
.door-shots{position:relative;display:flex;justify-content:center;align-items:flex-end;gap:16px;padding-bottom:26px}
.door-shots img{border:3px solid #fff;border-radius:10px;box-shadow:0 18px 40px rgba(0,0,0,.5)}
.d-s1{width:240px;transform:translateY(-14px)}
.d-s2{width:320px;z-index:2}
.d-s3{width:240px;transform:translateY(-14px)}
.g-stats{margin-top:34px;display:flex;justify-content:space-around;border:1px solid var(--line);border-radius:14px;background:var(--night2);padding:22px 14px}
.g-stats li{text-align:center}
.g-stats span,.g-stats b{display:block;font-family:var(--en);font-weight:700;font-size:30px;color:var(--neon2);line-height:1.2}
.g-stats i{font-style:normal;font-size:12.5px;letter-spacing:.18em;color:var(--muted)}

/* ---------- 走廊分隔条 ---------- */
.corridor{display:flex;justify-content:center;gap:22px;padding:34px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.corridor span{width:8px;height:8px;border-radius:50%;background:var(--neon);box-shadow:0 0 12px rgba(255,90,43,.7);opacity:.85}
.corridor span:nth-child(even){background:var(--sky);box-shadow:0 0 12px rgba(108,195,232,.7)}
.corridor span:nth-child(3n){opacity:.5}

/* ---------- 分节：窄栏 ---------- */
.sec{max-width:760px;margin:0 auto;padding:74px 22px}
.sec-head{margin-bottom:38px;text-align:center}
.sec-en{font-family:var(--en);font-weight:700;font-size:12.5px;letter-spacing:.3em;color:var(--sky);margin-bottom:8px}
.sec-head h2{font-family:var(--serif);font-size:clamp(26px,3.4vw,36px);font-weight:900;letter-spacing:.12em}
.sec-head h2::after{content:"";display:block;width:52px;height:3px;background:var(--neon);margin:12px auto 0;border-radius:2px}
.sec-sub{margin-top:10px;font-size:13.5px;color:var(--muted);letter-spacing:.08em}

/* 藏书三阁 */
.hall{border-left:3px solid var(--neon);padding:4px 0 4px 22px;margin-bottom:36px;text-align:left}
.hall:last-child{margin-bottom:0}
.hall:nth-child(even){border-left-color:var(--sky)}
.hall-no{font-family:var(--en);font-weight:700;font-size:12.5px;letter-spacing:.26em;color:var(--neon2);margin-bottom:8px}
.hall:nth-child(even) .hall-no{color:var(--sky)}
.hall h3{font-family:var(--serif);font-size:21px;font-weight:900;margin-bottom:8px}
.hall p{font-size:14.5px;color:var(--moon2)}

/* 三闸机 */
.gates{display:flex;flex-direction:column;gap:18px}
.g-lane{border:1px solid var(--line);border-radius:14px;background:var(--night2);padding:26px 26px 24px;text-align:left;display:flex;flex-direction:column;gap:10px;transition:.3s}
.g-lane:hover{border-color:var(--neon);box-shadow:0 0 24px rgba(255,90,43,.15)}
.g-lane.main{border-color:var(--neon)}
.lane-no{font-family:var(--en);font-weight:700;font-size:12px;letter-spacing:.24em;color:var(--sky)}
.g-lane.main .lane-no{color:var(--neon2)}
.g-lane h3{font-family:var(--serif);font-size:20px;font-weight:900}
.g-lane p{font-size:14px;color:var(--moon2)}
.g-lane .btn-main,.g-lane .btn-ghost{align-self:flex-start}
.spec-list li{font-size:14px;color:var(--moon2);padding:3px 0 3px 20px;position:relative}
.spec-list li::before{content:"";position:absolute;left:0;top:13px;width:8px;height:8px;border-radius:50%;background:var(--sky)}
.gate-tip{text-align:center;margin-top:22px;font-size:12.5px;color:var(--muted);letter-spacing:.1em}

/* 守阁问答 */
.keep-qa{display:flex;flex-direction:column;gap:12px}
.qa{border:1px solid var(--line);border-radius:12px;background:var(--night2);overflow:hidden;transition:.3s}
.qa[open]{border-color:var(--neon);box-shadow:0 0 20px rgba(255,90,43,.12)}
.qa summary{display:flex;align-items:center;gap:14px;padding:17px 20px;cursor:pointer;list-style:none;font-weight:700;font-size:15.5px;user-select:none}
.qa summary::-webkit-details-marker{display:none}
.qa summary::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--neon);box-shadow:0 0 10px rgba(255,90,43,.8);flex:none}
.qa summary::after{content:"+";margin-left:auto;font-family:var(--en);font-size:20px;color:var(--sky);transition:.3s;flex:none}
.qa[open] summary::after{transform:rotate(45deg)}
.qa p{padding:0 20px 18px 43px;font-size:14px;color:var(--moon2)}

/* 一盏盏灯 */
.lantern-col{display:flex;flex-direction:column;gap:14px}
.lamp{border:1px solid var(--line);border-left:4px solid var(--neon);border-radius:10px;background:var(--night2);padding:18px 20px;text-align:left;transition:.3s}
.lamp:nth-child(even){border-left-color:var(--sky)}
.lamp:hover{transform:translateX(6px)}
.lamp-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.lamp-head img{width:34px;height:34px;border-radius:50%;border:2px solid var(--neon)}
.lamp:nth-child(even) .lamp-head img{border-color:var(--sky)}
.lamp-head b{font-size:14.5px}
.lamp-head time{margin-left:auto;font-family:var(--en);font-size:12px;color:var(--muted)}
.lamp p{font-size:14px;color:var(--moon2)}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line);background:var(--night2)}
.foot-inner{max-width:760px;margin:0 auto;padding:46px 22px 28px;text-align:center}
.foot-brand{display:flex;align-items:center;justify-content:center;gap:14px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.foot-brand img{width:40px;height:40px;border-radius:50%}
.foot-brand b{display:block;color:var(--moon);font-family:var(--serif);font-size:16px;letter-spacing:.12em}
.foot-brand span{display:block;font-size:12.5px;color:var(--neon2);letter-spacing:.1em}
.foot-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;padding:20px 0;font-size:14px}
.foot-nav a{color:var(--moon2);transition:.25s}
.foot-nav a:hover{color:var(--neon)}
.foot-tip{font-size:12.5px;color:var(--muted);letter-spacing:.06em}
.foot-copy{margin-top:8px;font-size:12px;color:rgba(242,246,250,.35)}

/* ---------- 悬浮投诉 & 返回顶部 ---------- */
.interaction-complaint-button{position:fixed;right:24px;bottom:110px;z-index:900;display:flex;flex-direction:column;align-items:center;gap:6px;background:var(--neon);color:#fff;font-size:12px;padding:12px 10px;border-radius:12px;box-shadow:0 0 22px rgba(255,90,43,.5)}
.interaction-complaint-button img{width:20px;height:20px}
.interaction-complaint-button:hover{background:#e04a1e}
.back-top{position:fixed;right:24px;bottom:40px;z-index:900;width:44px;height:44px;border-radius:50%;background:var(--sky);color:var(--night);font-weight:900;font-size:15px;box-shadow:0 0 20px rgba(108,195,232,.5);opacity:0;pointer-events:none;transform:translateY(14px);transition:.3s}
.back-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}

/* ---------- 滚动显现 ---------- */
.rev{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.rev.in{opacity:1;transform:none}

/* ---------- 移动端 ≤900 ---------- */
@media (max-width:900px){
  .topline{padding:12px 16px;gap:14px}
  .tl-nav{display:none}
  .tl-cta{margin-left:0;padding:9px 16px;font-size:13.5px}
  .tl-toggle{display:flex}
  .m-menu.open{display:block}
  .hero{padding:56px 16px 40px}
  .g-cta .btn-main,.g-cta .btn-ghost{width:100%;text-align:center}
  .door{padding:26px 18px 0}
  .door-shots{gap:10px}
  .d-s1,.d-s3{display:none}
  .d-s2{width:min(72vw,320px)}
  .g-stats span,.g-stats b{font-size:23px}
  .sec{padding:56px 16px}
  .hall{padding-left:16px}
  .g-lane .btn-main,.g-lane .btn-ghost{align-self:stretch;text-align:center}
  .qa p{padding-left:20px}
  .interaction-complaint-button{right:14px;bottom:96px}
  .back-top{right:16px;bottom:32px}
}