:root{
  --void:#05060c; --stone-deep:#0b0e1a; --stone:#141828;
  --blue-neon:#4fd8ff; --violet-neon:#a855f7; --gold-relic:#d9b46a; --danger:#ff5470;
  --ink-hi:#eef1fb; --ink-lo:#8b93b3; --ink-faint:#525a78;
  --line:rgba(143,159,214,0.16);
  --radius-m:14px; --radius-l:24px;
  --ease:cubic-bezier(.16,.8,.28,1);
  --font-display:'Cinzel',serif; --font-ui:'Orbitron',sans-serif; --font-body:'Rajdhani',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{background:var(--void);color:var(--ink-hi);font-family:var(--font-body);font-size:17px;-webkit-font-smoothing:antialiased;}
h1,h2,h3{font-family:var(--font-display);font-weight:700;}
a{color:inherit;text-decoration:none;}
button,input,select{font-family:inherit;color:inherit;}
button{cursor:pointer;border:none;background:none;}
img,svg{display:block;max-width:100%;}
@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important;}}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--blue-neon);outline-offset:2px;}

#bg{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(ellipse 60% 40% at 85% 0%, rgba(168,85,247,.10), transparent 60%),
             radial-gradient(ellipse 50% 40% at 5% 100%, rgba(79,216,255,.10), transparent 60%), var(--void);}

.container{width:min(820px,100% - 40px);margin-inline:auto;position:relative;z-index:1;}

header.top-nav{position:sticky;top:0;z-index:10;padding:16px 0;background:rgba(8,10,20,.75);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);}
.nav-row{width:min(1200px,100% - 40px);margin-inline:auto;display:flex;align-items:center;gap:20px;flex-wrap:wrap;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:1.05rem;}
.brand svg{width:30px;height:30px;}
.nav-links{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap;}
.nav-links a{font-family:var(--font-ui);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;padding:8px 12px;border-radius:6px;color:var(--ink-lo);transition:color .2s ease,background .2s ease;}
.nav-links a:hover{color:var(--ink-hi);background:rgba(79,216,255,.08);}
.nav-links a.active{color:var(--blue-neon);}

main{padding:50px 0 90px;}
.page-head{margin-bottom:36px;}
.eyebrow{font-family:var(--font-ui);font-size:.72rem;letter-spacing:.32em;text-transform:uppercase;color:var(--blue-neon);}
.page-head h1{font-size:clamp(1.8rem,4vw,2.6rem);margin-top:12px;text-transform:uppercase;}

.reveal{opacity:0;transform:translateY(20px);transition:opacity .55s var(--ease),transform .55s var(--ease);}
.reveal.in{opacity:1;transform:translateY(0);}

.settings-panel{
  border-radius:var(--radius-l);border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(20,24,40,.5),rgba(8,10,20,.65));
  padding:8px 28px;margin-bottom:22px;
}
.settings-panel h2{
  font-size:.98rem;padding:20px 0 14px;display:flex;align-items:center;gap:10px;text-transform:uppercase;letter-spacing:.02em;
}
.settings-panel h2 svg{width:18px;height:18px;stroke:var(--blue-neon);}

.setting-row{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:18px 0;border-top:1px solid var(--line);flex-wrap:wrap;
}
.setting-row:first-of-type{border-top:none;}
.setting-label{display:flex;flex-direction:column;gap:3px;}
.setting-label .sl-name{font-size:1rem;font-weight:600;}
.setting-label .sl-desc{font-size:.86rem;color:var(--ink-lo);}
.setting-control{flex:0 0 auto;min-width:160px;display:flex;justify-content:flex-end;}

/* ============== TOGGLE SWITCH ============== */
.switch{position:relative;display:inline-block;width:52px;height:28px;flex:0 0 auto;}
.switch input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer;z-index:2;}
.switch .track{
  position:absolute;inset:0;border-radius:20px;background:rgba(255,255,255,.08);border:1px solid var(--line);
  transition:background .3s ease,border-color .3s ease;
}
.switch .thumb{
  position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:var(--ink-faint);
  transition:transform .3s var(--ease),background .3s ease,box-shadow .3s ease;
}
.switch input:checked ~ .track{background:linear-gradient(120deg,var(--blue-neon),var(--violet-neon));border-color:transparent;}
.switch input:checked ~ .thumb{transform:translateX(24px);background:#fff;box-shadow:0 0 10px rgba(79,216,255,.6);}
.switch input:focus-visible ~ .track{outline:2px solid var(--blue-neon);outline-offset:2px;}

/* ============== SLIDER ============== */
.slider-wrap{display:flex;align-items:center;gap:12px;min-width:220px;}
input[type="range"]{
  -webkit-appearance:none;appearance:none;width:150px;height:6px;border-radius:4px;
  background:linear-gradient(90deg,var(--blue-neon) var(--val,70%),rgba(255,255,255,.08) 0);
  outline:none;cursor:pointer;
}
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:#fff;
  box-shadow:0 0 10px rgba(79,216,255,.6);border:2px solid var(--blue-neon);cursor:pointer;
  transition:transform .15s ease;
}
input[type="range"]::-webkit-slider-thumb:hover{transform:scale(1.15);}
input[type="range"]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#fff;border:2px solid var(--blue-neon);cursor:pointer;}
.slider-val{font-family:var(--font-ui);font-size:.72rem;color:var(--ink-lo);min-width:34px;text-align:right;}

/* ============== SEGMENTED CONTROL (difficulty) ============== */
.segmented{display:flex;border:1px solid var(--line);border-radius:10px;overflow:hidden;}
.segmented button{
  padding:9px 16px;font-family:var(--font-ui);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-lo);transition:background .25s ease,color .25s ease;border-right:1px solid var(--line);
}
.segmented button:last-child{border-right:none;}
.segmented button.active{background:linear-gradient(120deg,var(--blue-neon),var(--violet-neon));color:var(--void);font-weight:700;}

/* ============== SELECT ============== */
.select-wrap{position:relative;}
select{
  appearance:none;background:var(--stone);border:1px solid var(--line);border-radius:8px;
  padding:9px 34px 9px 14px;font-size:.92rem;color:var(--ink-hi);min-width:150px;cursor:pointer;
  transition:border-color .2s ease;
}
select:hover{border-color:var(--blue-neon);}
.select-wrap::after{
  content:'';position:absolute;right:12px;top:50%;width:8px;height:8px;
  border-right:2px solid var(--ink-lo);border-bottom:2px solid var(--ink-lo);
  transform:translateY(-65%) rotate(45deg);pointer-events:none;
}

/* ============== THEME SWATCHES ============== */
.theme-row{display:flex;gap:12px;}
.theme-swatch{
  width:40px;height:40px;border-radius:10px;border:2px solid transparent;cursor:pointer;position:relative;
  transition:transform .2s ease,border-color .2s ease;
}
.theme-swatch:hover{transform:translateY(-3px);}
.theme-swatch.active{border-color:var(--blue-neon);box-shadow:0 0 14px rgba(79,216,255,.4);}
.theme-swatch.active::after{content:'✓';position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:.9rem;text-shadow:0 1px 3px rgba(0,0,0,.6);}

/* ============== ACCOUNT ============== */
.account-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:20px 0;}
@media(max-width:600px){.account-grid{grid-template-columns:1fr;}}
.field label{display:block;font-family:var(--font-ui);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:8px;}
.field input[type="text"],.field input[type="email"]{
  width:100%;background:var(--stone);border:1px solid var(--line);border-radius:8px;
  padding:11px 14px;color:var(--ink-hi);font-size:.96rem;transition:border-color .2s ease;
}
.field input:focus{outline:none;border-color:var(--blue-neon);}
.account-actions{display:flex;gap:12px;padding-bottom:22px;flex-wrap:wrap;}
.btn{font-family:var(--font-ui);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;padding:11px 22px;border-radius:2px;display:inline-flex;align-items:center;gap:8px;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;}
.btn:hover{transform:translateY(-2px);}
.btn-primary{color:var(--void);background:linear-gradient(120deg,var(--blue-neon),var(--violet-neon));font-weight:700;box-shadow:0 0 18px rgba(79,216,255,.3);}
.btn-ghost{border:1px solid var(--line);color:var(--ink-hi);}
.btn-danger{border:1px solid rgba(255,84,112,.4);color:var(--danger);}
.btn-danger:hover{background:rgba(255,84,112,.08);}

.save-toast{
  position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);z-index:50;
  padding:12px 22px;border-radius:10px;background:rgba(15,18,32,.95);border:1px solid rgba(78,224,138,.4);
  color:var(--ink-hi);font-family:var(--font-ui);font-size:.75rem;letter-spacing:.08em;
  opacity:0;visibility:hidden;transition:opacity .3s ease,transform .3s ease,visibility .3s ease;
  display:flex;align-items:center;gap:8px;
}
.save-toast.show{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);}
.save-toast svg{width:15px;height:15px;stroke:#4ee08a;}

footer{padding:40px 0;text-align:center;color:var(--ink-faint);font-size:.85rem;border-top:1px solid var(--line);margin-top:10px;}

/* ============== RESPONSIVE ============== */
@media (max-width:760px){
  main{padding:34px 0 70px;}
  .settings-panel{padding:6px 20px;}
  .setting-row{flex-direction:column;align-items:flex-start;gap:12px;padding:18px 0;}
  .setting-control{width:100%;justify-content:flex-start;}
  .slider-wrap{width:100%;}
  input[type="range"]{flex:1;width:auto;}
  .segmented{width:100%;}
  .segmented button{flex:1;padding:9px 10px;}
  .nav-row{gap:12px;}
  .nav-links{gap:2px;width:100%;justify-content:flex-start;order:3;}
  .nav-links a{padding:7px 9px;font-size:.62rem;}
  .account-actions{flex-direction:column;}
  .account-actions .btn{width:100%;justify-content:center;}
}

@media (max-width:480px){
  body{font-size:15.5px;}
  .container{width:calc(100% - 28px);}
  .brand{font-size:.92rem;}
  .brand svg{width:26px;height:26px;}
  .page-head h1{font-size:1.6rem;}
  .settings-panel h2{font-size:.88rem;padding:16px 0 12px;}
  .setting-label .sl-name{font-size:.94rem;}
  .setting-label .sl-desc{font-size:.8rem;}
  .theme-row{flex-wrap:wrap;}
}