/* ===================================================================
   GrooveSteps unified design system  —  one theme, one shell
   Palette: near-black + purple (#8b5cf6) + green (#2ee06b)
   Type: Fraunces (display) / DM Sans (body) / JetBrains Mono
   Scoped under .gs-* so it never fights existing page styles.
   =================================================================== */
:root{
  --gs-bg:#070d22; --gs-bg-2:#0c1330; --gs-surface:#131c44; --gs-surface-2:#1b2656;
  --gs-border:#2a3566; --gs-border-soft:#1e2a55;
  --gs-purple:#8b5cf6; --gs-purple-lt:#c4b5fd; --gs-purple-dk:#6d40e6;
  --gs-green:#2ee06b; --gs-green-dk:#27ae60;
  --gs-ink:#ece9f7; --gs-ink-soft:#b3acc9; --gs-ink-mute:#8780a0;
  --gs-shadow:0 8px 30px rgba(0,0,0,.45);
  --gs-head-h:60px;
  --gs-font-disp:"Fraunces",Georgia,serif;
  --gs-font-body:"DM Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --gs-font-mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
}

/* ---------- GLOBAL HEADER ---------- */
.gs-header{position:sticky;top:0;z-index:100000;font-family:var(--gs-font-body);
  background:rgba(7,13,34,.86);backdrop-filter:saturate(140%) blur(10px);
  -webkit-backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--gs-border);}
.gs-header *{box-sizing:border-box;}
.gs-header-inner{max-width:1180px;margin:0 auto;padding:0 20px;height:var(--gs-head-h);
  display:flex;align-items:center;gap:24px;}
.gs-logo{display:inline-flex;align-items:center;gap:9px;text-decoration:none;
  font-family:var(--gs-font-disp);font-weight:600;font-size:1.18rem;color:var(--gs-ink);
  letter-spacing:-.01em;white-space:nowrap;}
.gs-logo b{font-weight:900;color:var(--gs-green);}
.gs-logo .gs-mark{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:7px;
  background:linear-gradient(135deg,var(--gs-purple),var(--gs-green));color:#0a0a14;
  font-size:.8rem;font-weight:900;transform:rotate(0deg);}
.gs-mainnav{margin-left:auto;display:flex;align-items:center;gap:6px;}
.gs-mainnav a{color:var(--gs-ink-soft);text-decoration:none;font-size:.94rem;font-weight:500;
  padding:8px 13px;border-radius:8px;transition:color .15s,background .15s;}
.gs-mainnav a:hover{color:var(--gs-ink);background:rgba(139,92,246,.12);}
.gs-mainnav a[aria-current="page"],.gs-mainnav a.gs-active{color:var(--gs-purple-lt);}
.gs-mainnav .gs-cta{margin-left:8px;color:#0a0a14;font-weight:700;
  background:linear-gradient(135deg,var(--gs-purple),var(--gs-green));padding:9px 17px;}
.gs-mainnav .gs-cta:hover{filter:brightness(1.08);background:linear-gradient(135deg,var(--gs-purple),var(--gs-green));}

/* ---------- SECTION SUB-NAV ---------- */
.gs-subnav{background:var(--gs-bg-2);border-bottom:1px solid var(--gs-border-soft);
  font-family:var(--gs-font-body);}
.gs-subnav-inner{max-width:1180px;margin:0 auto;padding:0 20px;display:flex;gap:4px;
  overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;}
.gs-subnav-inner::-webkit-scrollbar{display:none;}
.gs-subnav a{flex:0 0 auto;color:var(--gs-ink-mute);text-decoration:none;font-size:.86rem;
  font-weight:500;padding:11px 14px;border-bottom:2px solid transparent;white-space:nowrap;
  transition:color .15s,border-color .15s;}
.gs-subnav a:hover{color:var(--gs-ink);}
.gs-subnav a[aria-current="page"],.gs-subnav a.gs-active{color:var(--gs-green);border-bottom-color:var(--gs-green);}

/* ---------- MOBILE ---------- */
.gs-burger{display:none;margin-left:auto;width:42px;height:38px;background:transparent;
  border:1px solid var(--gs-border);border-radius:8px;cursor:pointer;padding:0;}
.gs-burger span{display:block;width:18px;height:2px;margin:3px auto;background:var(--gs-ink);
  border-radius:2px;transition:transform .2s,opacity .2s;}
.gs-burger[aria-expanded="true"] span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.gs-burger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.gs-burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}
@media(max-width:760px){
  .gs-burger{display:block;}
  .gs-mainnav{position:fixed;top:var(--gs-head-h);left:0;right:0;margin:0;flex-direction:column;
    align-items:stretch;gap:0;background:var(--gs-bg-2);border-bottom:1px solid var(--gs-border);
    padding:8px;transform:translateY(-150%);transition:transform .25s ease;box-shadow:var(--gs-shadow);}
  .gs-header.gs-open .gs-mainnav{transform:translateY(0);}
  .gs-mainnav a{padding:13px 14px;border-radius:8px;font-size:1rem;}
  .gs-mainnav .gs-cta{margin:6px 0 2px;text-align:center;}
}

/* ---------- FOOTER ---------- */
.gs-footer{background:var(--gs-bg-2);border-top:1px solid var(--gs-border);
  font-family:var(--gs-font-body);color:var(--gs-ink-soft);margin-top:64px;}
.gs-footer a{color:var(--gs-ink-soft);text-decoration:none;}
.gs-footer a:hover{color:var(--gs-purple-lt);}
.gs-footer-inner{max-width:1180px;margin:0 auto;padding:48px 20px 28px;
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;}
.gs-foot-brand{font-family:var(--gs-font-disp);font-size:1.3rem;color:var(--gs-ink);font-weight:600;}
.gs-foot-brand b{color:var(--gs-green);font-weight:900;}
.gs-foot-brand p{font-family:var(--gs-font-body);font-size:.88rem;color:var(--gs-ink-mute);
  font-weight:400;margin:10px 0 0;max-width:34ch;line-height:1.5;}
.gs-foot-col h4{font-size:.74rem;text-transform:uppercase;letter-spacing:.12em;
  color:var(--gs-purple-lt);margin:0 0 12px;font-weight:700;}
.gs-foot-col a{display:block;font-size:.9rem;padding:5px 0;}
.gs-foot-legal{border-top:1px solid var(--gs-border-soft);font-size:.8rem;color:var(--gs-ink-mute);
  text-align:center;padding:18px 20px;}
.gs-foot-legal a{color:var(--gs-purple-lt);}
@media(max-width:760px){.gs-footer-inner{grid-template-columns:1fr 1fr;gap:24px;}.gs-foot-brand{grid-column:1/-1;}}
@media(max-width:440px){.gs-footer-inner{grid-template-columns:1fr;}}

/* ---------- LESSON PLAY-ALONG WIDGET ---------- */
.gs-play{margin:20px 0;padding:18px;border:1px solid var(--gs-border);border-radius:14px;
  background:linear-gradient(160deg,var(--gs-bg-2),var(--gs-surface));font-family:var(--gs-font-body);}
.gs-play-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px;}
.gs-midi-btn{background:linear-gradient(135deg,var(--gs-purple),var(--gs-green));color:#0a0a14;
  font-weight:700;font-family:var(--gs-font-body);border:0;border-radius:9px;padding:10px 16px;cursor:pointer;font-size:.92rem;}
.gs-midi-btn:hover{filter:brightness(1.08);}
.gs-midi-btn:disabled{opacity:.5;cursor:not-allowed;filter:none;}
.gs-midi-status{font-size:.84rem;color:var(--gs-ink-soft);}
.gs-play-pads{display:grid;grid-template-columns:repeat(auto-fit,minmax(82px,1fr));gap:10px;}
.gs-pad{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;min-height:72px;
  border:1px solid var(--gs-border);border-radius:11px;cursor:pointer;background:var(--gs-surface);color:var(--gs-ink);
  font-family:var(--gs-font-body);transition:transform .05s,box-shadow .1s;-webkit-tap-highlight-color:transparent;user-select:none;}
.gs-pad:active{transform:scale(.96);}
.gs-pad-name{font-weight:600;font-size:.9rem;}
.gs-pad-key{font-family:var(--gs-font-mono);font-size:.66rem;color:var(--gs-ink-mute);border:1px solid var(--gs-border);border-radius:5px;padding:1px 6px;}
.gs-pad-on{background:linear-gradient(135deg,var(--gs-purple),var(--gs-green))!important;color:#0a0a14!important;box-shadow:0 0 20px rgba(46,224,107,.55);}
.gs-pad-on .gs-pad-key{color:#0a0a14;border-color:rgba(10,10,20,.3);}
.gs-play-hint{font-size:.82rem;color:var(--gs-ink-mute);margin:12px 0 0;line-height:1.5;}
.gs-play-title{font-family:var(--gs-font-disp);font-size:1.15rem;color:var(--gs-ink);margin:24px 0 0;font-weight:600;}

/* ---------- SCORING UI ---------- */
.gs-hud{margin-top:14px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-height:28px;}
.gs-hud-stat{font-family:var(--gs-font-mono);font-size:.85rem;color:var(--gs-green);}
.gs-judge{display:inline-block;font-family:var(--gs-font-body);font-weight:700;font-size:.8rem;padding:2px 8px;border-radius:6px;animation:gsPop .5s ease forwards;}
.gs-j-perfect{color:#0a0a14;background:var(--gs-green);}
.gs-j-good{color:#0a0a14;background:var(--gs-purple-lt);}
.gs-j-ok{color:var(--gs-ink);background:var(--gs-surface-2);}
.gs-j-miss{color:#fff;background:#c0392b;}
@keyframes gsPop{0%{transform:translateY(6px) scale(.9);opacity:0}20%{transform:none;opacity:1}100%{opacity:.85}}
.gs-card{margin-top:16px;padding:20px;border:1px solid var(--gs-border);border-radius:14px;background:var(--gs-bg-2);text-align:center;}
.gs-card-grade{font-family:var(--gs-font-disp);font-size:3rem;font-weight:900;line-height:1;}
.gs-grade-S,.gs-grade-A{color:var(--gs-green);}.gs-grade-B{color:var(--gs-purple-lt);}.gs-grade-C{color:#e6c84d;}.gs-grade-D,.gs-grade-F{color:#e57373;}
.gs-card-acc{font-family:var(--gs-font-mono);font-size:1.6rem;color:var(--gs-ink);margin-top:4px;}
.gs-card-rows{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin:12px 0;font-size:.85rem;}
.gs-card-rows span{color:var(--gs-ink-soft);}
.gs-r-perfect{color:var(--gs-green)!important;}.gs-r-good{color:var(--gs-purple-lt)!important;}.gs-r-miss{color:#e57373!important;}
.gs-card-sub{font-size:.85rem;color:var(--gs-ink-mute);margin-bottom:12px;}
.gs-again{margin-top:4px;}
.gs-cal{margin-top:14px;padding:14px;border:1px dashed var(--gs-border);border-radius:11px;}
.gs-cal-msg{margin:0;font-size:.9rem;color:var(--gs-ink-soft);}
.gs-cal-count{font-family:var(--gs-font-mono);font-size:.82rem;color:var(--gs-green);margin-top:6px;}
.gs-midi-ghost{background:transparent!important;color:var(--gs-ink)!important;border:1px solid var(--gs-border)!important;font-weight:500!important;}