/* Premium skin for Vocab Study Hub (dark, maroon accent). Presentation only: ids, markup and behaviour unchanged.
   Loaded after the page's inline <style> so it overrides by specificity/order. */
.gate-card,.study-card{border-top:0;border-radius:26px;border:1px solid var(--border);box-shadow:0 30px 60px -36px rgba(0,0,0,.8);overflow:hidden;position:relative}
.gate-card::before,.study-card::before{content:"";position:absolute;left:0;right:0;top:0;height:5px;background:linear-gradient(90deg,var(--red),var(--gold))}
.gate-eyebrow{border-radius:99px;padding:5px 14px}
.gate-input{border-radius:12px;border:1px solid #333;padding:13px 16px;margin-bottom:14px}
.gate-input:focus{border-color:var(--red);box-shadow:0 0 0 3px color-mix(in srgb,var(--red) 22%,transparent)}
.gate-error{border-radius:10px}
.btn-login,.btn-start{border-radius:14px;background:linear-gradient(150deg,color-mix(in srgb,var(--red) 90%,#fff),color-mix(in srgb,var(--red) 55%,#000));box-shadow:0 14px 24px -16px color-mix(in srgb,var(--red) 85%,transparent);transition:transform .15s,box-shadow .15s}
.btn-login:hover:not(:disabled),.btn-start:hover:not(:disabled){transform:translateY(-2px);background:linear-gradient(150deg,color-mix(in srgb,var(--red) 90%,#fff),color-mix(in srgb,var(--red) 55%,#000))}
.btn-login:disabled,.btn-start:disabled{background:#33333a;box-shadow:none}
.btn-guest,.btn-logout{border-radius:12px}
.student-welcome{padding:16px 18px;margin:-6px 0 24px;border:0;border-radius:18px;background:linear-gradient(135deg,color-mix(in srgb,var(--red) 22%,var(--card-bg)),var(--card-bg) 70%)}
.welcome-badge{border-radius:99px;padding:5px 12px}
.study-gate-title{font-size:13px;letter-spacing:.14em}
/* mode picker */
.mode-tiles{grid-template-columns:repeat(3,1fr);gap:12px}
.mode-tile{position:relative;border:2px solid #2a2a2a;border-radius:20px;padding:22px 14px;background:#131317;transition:transform .18s,border-color .18s,box-shadow .18s}
.mode-tile:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--red) 55%,#2a2a2a)}
.mode-tile.selected{border-color:var(--red);background:color-mix(in srgb,var(--red) 10%,#131317);box-shadow:0 16px 28px -20px color-mix(in srgb,var(--red) 85%,transparent)}
.mode-tile-icon{display:grid;place-items:center;width:52px;height:52px;margin:0 auto 12px;border-radius:16px;background:color-mix(in srgb,var(--red) 16%,transparent);font-size:26px}
.mode-tile-name{font-size:18px}
/* chips */
.filter-chip{border-radius:99px;padding:6px 14px;transition:transform .15s,border-color .15s,background .15s}
.filter-chip:hover{transform:translateY(-1px)}
.filter-chip.all-active{background:color-mix(in srgb,var(--red) 22%,#26262c);border-color:color-mix(in srgb,var(--red) 55%,#444)}
.filter-chip.active{background:linear-gradient(150deg,var(--red),color-mix(in srgb,var(--red) 55%,#000));border-color:transparent}
.also-links a{border-radius:99px;padding:5px 12px;transition:transform .15s,border-color .15s}
.also-links a:hover{transform:translateY(-1px);border-color:var(--red)}
/* study view */
.study-topbar{background:rgba(13,13,15,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);height:58px}
.mode-badge,.btn-change-filter,.fc-counter-top{border-radius:99px;padding:5px 14px}
.btn-change-filter:hover{border-color:var(--red)}
.fc-counter-bar{display:inline-block;position:relative;left:50%;transform:translateX(-50%);padding:6px 16px;border-radius:99px;background:color-mix(in srgb,var(--red) 12%,transparent);color:var(--red)}
.fc-card{position:relative;overflow:hidden;max-width:520px;min-height:280px;border-radius:26px;border:1px solid var(--border);background:linear-gradient(160deg,#1f1f25,var(--card-bg));box-shadow:0 30px 50px -34px rgba(0,0,0,.9);transition:transform .2s,border-color .2s,box-shadow .2s}
.fc-card::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;background:linear-gradient(90deg,var(--red),var(--gold))}
.fc-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--red) 50%,var(--border))}
.fc-card.flipped{border-color:color-mix(in srgb,var(--red) 55%,var(--border));box-shadow:0 30px 50px -30px color-mix(in srgb,var(--red) 55%,#000)}
.fc-big-word{font-size:clamp(38px,8vw,58px)}
.fc-pos-badge,.wc-pos{border-radius:99px}
.fc-tap-hint{display:inline-block;margin-top:14px;padding:6px 14px;border-radius:99px;background:rgba(255,255,255,.05);color:var(--gray-mid);animation:vsp-nudge 2.4s ease-in-out infinite}
@keyframes vsp-nudge{0%,100%{transform:translateY(0)}50%{transform:translateY(3px)}}
.fc-example{border-left-color:var(--red);border-radius:0 10px 10px 0;background:rgba(255,255,255,.03);padding:8px 12px}
.bangla-hint{border-radius:0 12px 12px 0;padding:8px 14px}
.speak-btn{border-radius:99px;padding:6px 14px}
.btn-nav{border-radius:14px;min-width:150px;transition:transform .15s,border-color .15s}
.btn-nav:hover:not(:disabled){transform:translateY(-2px)}
.btn-nav-next{background:linear-gradient(150deg,color-mix(in srgb,var(--red) 90%,#fff),color-mix(in srgb,var(--red) 55%,#000));border-color:transparent;box-shadow:0 14px 24px -16px color-mix(in srgb,var(--red) 85%,transparent)}
.btn-nav-next:hover:not(:disabled){background:linear-gradient(150deg,color-mix(in srgb,var(--red) 90%,#fff),color-mix(in srgb,var(--red) 55%,#000));border-color:transparent}
.fc-end{border-radius:26px;border:2px dashed color-mix(in srgb,var(--red) 40%,#2a2a2a);background:color-mix(in srgb,var(--red) 4%,transparent)}
.fc-end-icon{display:grid;place-items:center;width:76px;height:76px;margin:0 auto 14px;border-radius:50%;background:color-mix(in srgb,var(--red) 16%,transparent);font-size:36px}
/* browse cards */
.wc-grid{gap:14px}
.wc{position:relative;border:1px solid var(--border);border-radius:18px;padding:18px 20px;transition:transform .18s,border-color .18s,box-shadow .18s}
.wc:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--red) 50%,var(--border));box-shadow:0 18px 30px -24px color-mix(in srgb,var(--red) 70%,#000)}
.wc-ex{border-left-color:var(--red)}
.empty-state{border-radius:20px;border-color:color-mix(in srgb,var(--red) 30%,#1a1a1a)}
@media(max-width:600px){.mode-tiles{grid-template-columns:1fr}.mode-tile{display:grid;grid-template-columns:auto 1fr;column-gap:14px;text-align:left;align-items:center}.mode-tile-icon{grid-row:span 2;margin:0}}
@media(prefers-reduced-motion:reduce){.fc-tap-hint{animation:none}.mode-tile,.wc,.fc-card,.filter-chip,.btn-nav{transition:none}}