/* LectureRoom update 24: a simple, airy home page. Loaded after landing.css; calm.css comes later, so each rule here is more specific. */
body.lp.hz{--hz-bg:#0e1521;--hz-card:#172134;--hz-card2:#1d2a42;--hz-line:#2a3a56;--hz-ink:#eef2f8;--hz-mute:#a6b6cc;--hz-acc:#1877f2;
  --hz-h1:#16254a;--hz-h2:#0f1a33;background:var(--hz-bg);color:var(--hz-ink)}
body.lp.hz.hzl{--hz-bg:#f4f6fc;--hz-card:#ffffff;--hz-card2:#eef2fb;--hz-line:#dde4f1;--hz-ink:#1c2430;--hz-mute:#556275;--hz-h1:#dfe7ff;--hz-h2:#f1f1ff}
body.lp.hz .lp-top{display:flex;align-items:center;justify-content:space-between;gap:12px;max-width:1100px;margin:0 auto;padding:14px 20px;position:relative;z-index:2}
body.lp.hz .lp-brand{color:var(--hz-ink)!important;font-weight:700;font-size:21px}
body.lp.hz .lp-top nav{display:flex;align-items:center;gap:10px}
body.lp.hz .lp-top nav a{color:var(--hz-mute);font-size:16px}
body.lp.hz .hz-theme{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--hz-line);background:var(--hz-card);color:var(--hz-ink);border-radius:999px;padding:8px 14px;font:inherit;font-size:15px;font-weight:600;cursor:pointer}
body.lp.hz .hz-themeic svg{width:18px;height:18px;display:block}
body.lp.hz .lp-main>h1,body.lp.hz .lp-main>.lp-sub{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
/* hero */
body.lp.hz .lp-top{margin-bottom:-64px;padding-bottom:0}
body.lp.hz .hz-hero{background:linear-gradient(165deg,var(--hz-h1) 0%,var(--hz-h2) 100%);padding:104px 20px 60px;text-align:center}
body.lp.hz .hz-hin{max-width:760px;margin:0 auto}
body.lp.hz .hz-h{margin:0;font-size:clamp(32px,6vw,56px);line-height:1.1;font-weight:800;letter-spacing:-.02em;color:var(--hz-ink)}
body.lp.hz .hz-p{margin:16px auto 0;font-size:clamp(18px,2.6vw,22px);line-height:1.45;color:var(--hz-mute);max-width:560px}
body.lp.hz .hz-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:30px}
body.lp.hz .hz-b{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:58px;padding:0 30px;border-radius:999px;border:0;font:inherit;font-size:19px;font-weight:700;cursor:pointer;transition:transform .12s,filter .12s}
body.lp.hz .hz-b:hover{transform:translateY(-1px);filter:brightness(1.05)}
body.lp.hz .hz-b:focus-visible{outline:3px solid rgba(24,119,242,.55);outline-offset:3px}
body.lp.hz .hz-b svg{width:24px;height:24px}
body.lp.hz .hz-b1{background:#1877f2;color:#fff}
body.lp.hz .hz-b2{background:#fff;color:#1556b8}
/* body */
body.lp.hz .lp-main{max-width:1100px;padding:30px 20px 24px}
body.lp.hz .hz-body{display:grid;gap:22px}
body.lp.hz .lp-cards{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
body.lp.hz .lp-card{background:var(--hz-card);border:1px solid var(--hz-line);border-radius:22px;box-shadow:none;color:var(--hz-ink);padding:26px}
body.lp.hz .lp-teach,body.lp.hz .lp-join{background:var(--hz-card);border:1px solid var(--hz-line)}
body.lp.hz .lp-card h2,body.lp.hz .lp-join h2{color:var(--hz-ink);font-size:26px}
body.lp.hz .lp-step{color:var(--hz-acc);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:13.5px}
body.lp.hz .lp input:not([type=checkbox]),body.lp.hz .lp select,body.lp.hz input[type=text],body.lp.hz input:not([type]),body.lp.hz select{background:var(--hz-card2);border:1.5px solid var(--hz-line);color:var(--hz-ink);border-radius:14px;font-size:18px;min-height:54px}
body.lp.hz input::placeholder{color:var(--hz-mute)}
body.lp.hz .lp-hint,body.lp.hz .lp-minor,body.lp.hz .lp-minor span{color:var(--hz-mute);font-size:16px;line-height:1.5}
body.lp.hz a{color:#5aa2ff}
body.lp.hz.hzl a{color:#1869d6}
body.lp.hz .lp-btn{border-radius:14px;font-weight:700;font-size:18px;min-height:54px}
body.lp.hz .lp-go{background:#f0782d;color:#fff}
body.lp.hz .lp-go:hover{background:#dc6a22}
body.lp.hz .lp-joinbtn{background:var(--hz-acc);color:#fff}
body.lp.hz .lp-joinbtn:disabled{background:var(--hz-card2);color:var(--hz-mute)}
body.lp.hz .lp-rec summary{color:#5aa2ff;font-size:17px}
body.lp.hz .notice{background:#3a2e12;border-color:#6b5200;color:#ffd98a}
/* your classes */
body.lp.hz .hz-mine{display:grid;grid-template-columns:1fr;gap:22px;background:var(--hz-card);border:1px solid var(--hz-line);border-radius:22px;padding:22px}
body.lp.hz .hz-mine.hz-two{grid-template-columns:1fr 1fr}
body.lp.hz .hz-mine[hidden],body.lp.hz .hz-col[hidden]{display:none}
body.lp.hz .hz-mine h2,body.lp.hz .lp-recent h2{font-size:15px;margin:0 4px 8px;color:var(--hz-mute);font-weight:700;text-transform:uppercase;letter-spacing:.05em}
body.lp.hz .lp-recent h2 span{text-transform:none;letter-spacing:0;font-weight:500}
body.lp.hz .lp-recent{margin:0}
body.lp.hz .lp-recent #recentList{display:grid;gap:4px}
body.lp.hz .lp-recent a,body.lp.hz .hz-row{display:flex;align-items:center;gap:12px;padding:9px 8px;border-radius:14px;border:0;background:transparent;color:var(--hz-ink)!important;text-decoration:none;font-size:17px;min-height:60px}
body.lp.hz .lp-recent a:hover,body.lp.hz .hz-row:hover{background:var(--hz-card2)}
body.lp.hz .lp-recent a strong{display:block;font-weight:600;line-height:1.2}
body.lp.hz .lp-recent a code{display:block;font-size:14px;color:var(--hz-mute);background:none;padding:0}
body.lp.hz .lp-recent a time{margin-left:auto;font-size:14px;color:var(--hz-mute);white-space:nowrap}
body.lp.hz .hz-av{flex:none;width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;color:#fff}
body.lp.hz .hz-txt{min-width:0;flex:1}
body.lp.hz .hz-txt b{display:block;font-weight:600;font-size:17px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
body.lp.hz .hz-txt span{display:block;font-size:14px;color:var(--hz-mute)}
body.lp.hz .hz-go{flex:none;font-size:15px;font-weight:700;color:#5aa2ff!important;padding:8px 13px;border-radius:999px;background:var(--hz-card2);text-decoration:none}
body.lp.hz .lp-recent #recentList a{background:transparent!important;color:var(--hz-ink)!important;border:0!important;box-shadow:none!important;box-sizing:border-box;width:100%;max-width:100%;overflow:hidden}
body.lp.hz .lp-recent #recentList a:hover{background:var(--hz-card2)!important}
body.lp.hz .lp-recent #recentList a strong{color:var(--hz-ink)!important;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
body.lp.hz .lp-recent #recentList a .hz-txt{min-width:0;flex:1}
body.lp.hz .lp-recent #recentList a code{color:var(--hz-mute)!important}
/* the six feature cards */
body.lp.hz .hz-feats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:6px}
body.lp.hz .hz-f{background:var(--hz-card);border:1px solid var(--hz-line);border-radius:22px;padding:24px}
body.lp.hz .hz-fi{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
body.lp.hz .hz-fi svg{width:26px;height:26px}
body.lp.hz .hz-f h3{margin:0 0 6px;font-size:21px;font-weight:700;color:var(--hz-ink)}
body.lp.hz .hz-f p{margin:0;font-size:17px;line-height:1.45;color:var(--hz-mute)}
body.lp.hz .lp-foot{color:var(--hz-mute);max-width:1100px;font-size:15px}
@media (max-width:900px){body.lp.hz .hz-feats{grid-template-columns:repeat(2,minmax(0,1fr))}body.lp.hz .hz-mine.hz-two{grid-template-columns:1fr}}
@media (max-width:760px){body.lp.hz .lp-cards{grid-template-columns:1fr}}
@media (max-width:520px){
  body.lp.hz .lp-top{padding:12px 14px 0}
  body.lp.hz .hz-hero{padding:76px 16px 40px}
  body.lp.hz .hz-b{height:54px;padding:0 24px;font-size:18px;flex:1 1 100%}
  body.lp.hz .lp-main{padding:22px 14px 20px}
  body.lp.hz .lp-card{padding:20px}
  body.lp.hz .lp-card h2,body.lp.hz .lp-join h2{font-size:23px}
  body.lp.hz .hz-feats{grid-template-columns:1fr;gap:12px}
  body.lp.hz .hz-f{padding:18px;display:grid;grid-template-columns:56px 1fr;column-gap:14px;align-items:center}
  body.lp.hz .hz-fi{grid-row:1/3;margin:0}
  body.lp.hz .hz-theme span:last-child:not(.hz-themeic){display:none}
}

/* update 27: class or meeting switch */
.hz-kw{text-align:center;margin:22px 0 0}
body.lp.hz .hz-kw + .hz-cta{margin-top:20px}
.hz-klab{display:block;font-size:13px;opacity:.75;margin:0 0 6px}
.hz-kind{display:inline-flex;gap:2px;padding:3px;border-radius:12px;background:rgba(127,127,127,.18)}
.hz-kind button{border:0;background:transparent;color:inherit;font:inherit;font-weight:600;padding:8px 20px;min-height:40px;border-radius:9px;cursor:pointer}
.hz-kind button[aria-pressed="true"]{background:#1877f2;color:#fff}