/* ── DESIGN TOKENS ──────────────────────────────────────── */
:root {
  /* Colors */
  --bg:         #080a10;
  --bg2:        #0d1018;
  --surf:       #111520;
  --surf2:      #171c2b;
  --surf3:      #1e2438;
  --bdr:        rgba(255,255,255,0.06);
  --bdr2:       rgba(255,255,255,0.11);
  --bdr3:       rgba(255,255,255,0.18);

  --gold:       #f0c040;
  --gold2:      #e8a820;
  --gold-a10:   rgba(240,192,64,0.10);
  --gold-a20:   rgba(240,192,64,0.20);
  --gold-a30:   rgba(240,192,64,0.30);

  --blue:       #4f8ef0;
  --blue-a:     rgba(79,142,240,0.10);
  --green:      #34d399;
  --green-a:    rgba(52,211,153,0.10);
  --red:        #f87171;
  --violet:     #a78bfa;

  --t1:         #f0f2f8;
  --t2:         #8891a8;
  --t3:         #4a5068;
  --t4:         #2e3448;

  /* Typography */
  --sans:    'Plus Jakarta Sans', sans-serif;
  --serif:   'Fraunces', serif;
  --mono:    'JetBrains Mono', monospace;

  /* Spacing & Shape */
  --r:      16px;
  --r-sm:   10px;
  --r-xs:   7px;
  --ease:   cubic-bezier(.25,.46,.45,.94);
  --spring: cubic-bezier(.34,1.56,.64,1);
}

/* ── RESET ────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:none}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--t1);
  min-height:100vh;
  line-height:1.6;
  overflow-x:hidden;
  font-size:15px;
}

/* ── CANVAS BACKGROUND ───────────────────────────────────── */
#bg-canvas{
  position:fixed;inset:0;z-index:0;
  pointer-events:none;opacity:.7;
}
.noise{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-size:256px 256px;
  opacity:.4;
}

/* ── STACKING ─────────────────────────────────────────────── */
header,section,main,footer,.drawer,.drawer-backdrop{position:relative;z-index:1}
.drawer,.drawer-backdrop{z-index:200}

/* ── REVEAL ANIMATIONS ────────────────────────────────────── */
.reveal{
  opacity:0;transform:translateY(22px);
  animation:revealUp .55s var(--ease) forwards;
}
@keyframes revealUp{
  to{opacity:1;transform:translateY(0)}
}

/* ── HEADER ───────────────────────────────────────────────── */
header{
  display:flex;align-items:center;justify-content:space-between;
  padding:.95rem 2rem;
  border-bottom:1px solid var(--bdr);
  background:rgba(8,10,16,.82);
  backdrop-filter:blur(24px) saturate(150%);
  -webkit-backdrop-filter:blur(24px) saturate(150%);
  position:sticky;top:0;z-index:100;
}

.logo{display:flex;align-items:center;gap:.55rem}
.logo-icon{
  color:var(--gold);display:flex;
  filter:drop-shadow(0 0 8px rgba(240,192,64,.4));
}
.logo-text{
  font-size:1.18rem;font-weight:800;
  letter-spacing:-.4px;color:var(--t1);
}
.logo-accent{color:var(--gold)}

.nav{display:flex;align-items:center;gap:.35rem}

.nav-btn{
  display:flex;align-items:center;gap:.35rem;
  padding:.38rem .75rem;
  background:none;border:1px solid transparent;
  border-radius:var(--r-xs);
  color:var(--t2);font-family:var(--sans);
  font-size:.8rem;font-weight:600;cursor:pointer;
  transition:all .18s var(--ease);
}
.nav-btn:hover{color:var(--t1);border-color:var(--bdr2);background:var(--surf2)}

.status-chip{
  display:flex;align-items:center;gap:.4rem;
  padding:.32rem .8rem;
  border:1px solid var(--bdr);
  border-radius:100px;
  background:var(--surf);
  font-family:var(--mono);font-size:.7rem;color:var(--t2);
  transition:all .3s;
}
.status-dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--t4);
  transition:all .4s;
}
.status-chip.online{border-color:rgba(52,211,153,.25);background:rgba(52,211,153,.06)}
.status-chip.online .status-dot{background:var(--green);box-shadow:0 0 7px var(--green)}
.status-chip.online #status-label{color:var(--green)}
.status-chip.error{border-color:rgba(248,113,113,.25)}
.status-chip.error .status-dot{background:var(--red);box-shadow:0 0 7px var(--red)}
.status-chip.error #status-label{color:var(--red)}

/* ── DRAWER ────────────────────────────────────────────────── */
.drawer-backdrop{
  position:fixed;inset:0;z-index:199;
  background:rgba(0,0,0,.55);
  backdrop-filter:blur(3px);
  animation:fadeIn .2s ease;
}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

.drawer{
  position:fixed;top:0;left:0;bottom:0;
  width:320px;z-index:200;
  background:var(--surf2);
  border-right:1px solid var(--bdr2);
  display:flex;flex-direction:column;
  animation:slideRight .24s var(--ease);
  overflow:hidden;
}
#history-drawer{
  left:auto;right:0;border-right:none;
  border-left:1px solid var(--bdr2);
  animation:slideLeft .24s var(--ease);
  width:360px;
}
@keyframes slideRight{from{transform:translateX(-100%)}to{transform:translateX(0)}}
@keyframes slideLeft{from{transform:translateX(100%)}to{transform:translateX(0)}}

.drawer-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:1.2rem 1.4rem;
  border-bottom:1px solid var(--bdr);
}
.drawer-head h3{font-size:1rem;font-weight:700;color:var(--t1)}
.close-btn{
  background:none;border:none;color:var(--t2);
  font-size:1rem;cursor:pointer;padding:.2rem;
  transition:color .15s;border-radius:4px;
}
.close-btn:hover{color:var(--t1);background:var(--surf3)}
.drawer-body{padding:1.4rem;overflow-y:auto;flex:1}

.field-label{
  display:block;font-size:.72rem;font-weight:700;
  color:var(--t2);text-transform:uppercase;
  letter-spacing:.6px;margin-bottom:.4rem;
}
.field-hint{font-size:.72rem;color:var(--t3);margin-top:.3rem}
.field-input{
  width:100%;padding:.55rem .8rem;
  background:var(--surf3);border:1px solid var(--bdr2);
  border-radius:var(--r-sm);color:var(--t1);
  font-family:var(--sans);font-size:.85rem;
  outline:none;transition:border-color .2s;
  appearance:none;
}
.field-input:focus{border-color:var(--gold)}
select.field-input{cursor:pointer}
.primary-btn{
  width:100%;margin-top:1.6rem;padding:.65rem;
  background:var(--gold);color:#07080d;
  border:none;border-radius:var(--r-sm);
  font-family:var(--sans);font-weight:700;font-size:.88rem;
  cursor:pointer;transition:all .18s var(--ease);
}
.primary-btn:hover{background:var(--gold2);transform:translateY(-1px)}
.primary-btn:active{transform:translateY(0)}

.text-danger-btn{
  background:none;border:none;color:var(--red);
  font-size:.78rem;font-family:var(--sans);
  font-weight:600;cursor:pointer;opacity:.7;
  transition:opacity .15s;
}
.text-danger-btn:hover{opacity:1}

/* History list */
.history-list{
  padding:.8rem 1rem;
  display:flex;flex-direction:column;gap:.5rem;
  overflow-y:auto;flex:1;max-height:calc(100vh - 80px);
}
.h-item{
  background:var(--surf3);border:1px solid var(--bdr);
  border-radius:var(--r-sm);padding:.7rem .95rem;
  cursor:pointer;transition:border-color .18s,transform .18s;
}
.h-item:hover{border-color:var(--bdr3);transform:translateX(2px)}
.h-action{
  font-family:var(--mono);font-size:.62rem;
  color:var(--gold);text-transform:uppercase;
  letter-spacing:.6px;margin-bottom:.18rem;
}
.h-preview{font-size:.8rem;color:var(--t2);line-height:1.45}
.h-time{font-size:.68rem;color:var(--t3);margin-top:.18rem}

.empty-state{
  display:flex;flex-direction:column;align-items:center;
  gap:.5rem;padding:2rem 0;color:var(--t3);text-align:center;
}
.empty-state p{font-size:.9rem;font-weight:500;color:var(--t2)}
.empty-state span{font-size:.78rem}

/* ── HERO ─────────────────────────────────────────────────── */
.hero{
  text-align:center;
  padding:5.5rem 1.5rem 3.5rem;
  max-width:720px;margin:0 auto;
}

.hero-pill{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.32rem 1.1rem;
  border:1px solid rgba(240,192,64,.22);
  border-radius:100px;
  background:var(--gold-a10);
  font-family:var(--mono);font-size:.7rem;
  color:var(--gold);letter-spacing:1px;
  text-transform:uppercase;
  margin-bottom:1.8rem;
}
.pulse-dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--gold);
  animation:pulse 2s ease infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(240,192,64,.6)}
  50%{box-shadow:0 0 0 5px rgba(240,192,64,0)}
}

.hero-h1{
  font-family:var(--sans);
  font-size:clamp(2.6rem,5.5vw,4rem);
  font-weight:800;letter-spacing:-2px;line-height:1.1;
  color:var(--t1);
}
.serif-em{
  font-family:var(--serif);
  font-style:italic;font-weight:300;
  color:var(--gold);letter-spacing:-1px;
  font-size:1.05em;
}

.hero-p{
  margin:1.3rem auto 0;
  font-size:1.02rem;color:var(--t2);
  max-width:500px;line-height:1.75;
}
.d-br{display:block}

.feature-row{
  display:flex;flex-wrap:wrap;justify-content:center;
  gap:.5rem;margin-top:2rem;
}
.ftag{
  padding:.38rem 1rem;
  background:var(--surf2);border:1px solid var(--bdr2);
  border-radius:100px;font-size:.82rem;font-weight:600;color:var(--t2);
  transition:all .2s var(--ease);cursor:default;
}
.ftag:hover{border-color:var(--gold-a30);color:var(--gold);background:var(--gold-a10);transform:translateY(-2px)}

/* ── MAIN ─────────────────────────────────────────────────── */
main{
  max-width:800px;margin:0 auto;
  padding:0 1.5rem 5rem;
  display:flex;flex-direction:column;gap:1.2rem;
}

/* ── CARD ─────────────────────────────────────────────────── */
.card{
  background:var(--surf);
  border:1px solid var(--bdr);
  border-radius:var(--r);
  overflow:hidden;
  transition:border-color .2s,box-shadow .2s;
  box-shadow:0 4px 24px rgba(0,0,0,.25);
}
.card:hover{border-color:var(--bdr2);box-shadow:0 8px 40px rgba(0,0,0,.35)}

/* ── TAB BAR ──────────────────────────────────────────────── */
.tab-bar{
  display:flex;align-items:center;
  border-bottom:1px solid var(--bdr);
  background:var(--surf2);
  position:relative;
}
.tab{
  display:flex;align-items:center;gap:.38rem;
  padding:.82rem 1.2rem;
  background:none;border:none;border-bottom:2px solid transparent;
  color:var(--t2);font-family:var(--sans);font-size:.84rem;
  font-weight:600;cursor:pointer;
  transition:color .18s,border-color .18s;
  white-space:nowrap;
}
.tab:hover{color:var(--t1)}
.tab.active{color:var(--gold);border-bottom-color:var(--gold)}

.word-stat{
  margin-left:auto;padding:0 1.1rem;
  font-family:var(--mono);font-size:.7rem;color:var(--t3);
}

/* ── TAB CONTENT ──────────────────────────────────────────── */
.tab-content{display:none}
.tab-content.active{display:block}

textarea{
  width:100%;min-height:190px;
  background:transparent;border:none;outline:none;
  resize:vertical;
  color:var(--t1);font-family:var(--sans);
  font-size:.95rem;line-height:1.8;
  padding:1.2rem 1.4rem;
  transition:background .2s;
}
textarea:focus{background:rgba(255,255,255,.01)}
textarea::placeholder{color:var(--t3)}

.ta-footer{
  display:flex;justify-content:flex-end;
  padding:.4rem 1.4rem .8rem;
}
.ghost-btn{
  background:none;border:none;color:var(--t3);
  font-size:.78rem;font-family:var(--sans);font-weight:600;
  cursor:pointer;transition:color .15s;padding:.2rem .4rem;border-radius:4px;
}
.ghost-btn:hover{color:var(--red)}

/* ── DROPZONE ─────────────────────────────────────────────── */
.dropzone{
  position:relative;margin:1.2rem;
  border:1.5px dashed var(--bdr2);
  border-radius:var(--r-sm);padding:2.6rem 1rem;
  text-align:center;cursor:pointer;
  transition:border-color .2s,background .2s;
}
.dropzone:hover,.dropzone.dragover{
  border-color:var(--blue);
  background:var(--blue-a);
}
.dropzone input[type="file"]{
  position:absolute;inset:0;opacity:0;
  cursor:pointer;width:100%;height:100%;
}
.dz-icon{color:var(--t3);display:flex;justify-content:center;margin-bottom:.7rem;transition:color .2s}
.dropzone:hover .dz-icon{color:var(--blue)}
.dz-title{font-size:.9rem;font-weight:600;color:var(--t1)}
.dz-sub{font-size:.82rem;color:var(--t2);margin-top:.2rem}
.dz-link{color:var(--blue);font-weight:600}
.dz-formats{margin-top:.8rem;font-family:var(--mono);font-size:.63rem;color:var(--t3);letter-spacing:1px}

.file-bar{
  display:flex;align-items:center;justify-content:space-between;
  gap:.6rem;margin:0 1.2rem 1.2rem;
  padding:.7rem 1rem;
  background:var(--surf2);border:1px solid var(--bdr2);
  border-radius:var(--r-sm);
  animation:slideDown .2s var(--ease);
}
@keyframes slideDown{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.file-meta{display:flex;align-items:center;gap:.6rem;min-width:0}
.file-ext{
  font-family:var(--mono);font-size:.6rem;font-weight:700;
  padding:.18rem .52rem;border-radius:4px;flex-shrink:0;
  background:var(--gold-a10);color:var(--gold);
  border:1px solid var(--gold-a20);
}
.file-name{font-size:.84rem;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.file-size-txt{font-family:var(--mono);font-size:.7rem;color:var(--t3);flex-shrink:0}
.icon-btn{
  background:none;border:1px solid var(--bdr);border-radius:6px;
  color:var(--t2);padding:.28rem .45rem;cursor:pointer;
  transition:all .15s;display:flex;flex-shrink:0;
}
.icon-btn:hover{border-color:var(--red);color:var(--red)}

/* ── ACTION BAR ───────────────────────────────────────────── */
.action-bar{
  display:flex;align-items:center;gap:.8rem;
  padding:.85rem 1rem;
  border-top:1px solid var(--bdr);
  background:var(--surf2);
  flex-wrap:wrap;
}

.mode-group{display:flex;gap:.35rem;flex:1;flex-wrap:wrap}

.mode-btn{
  display:flex;align-items:center;gap:.3rem;
  padding:.37rem .85rem;
  background:var(--surf3);border:1px solid var(--bdr);
  border-radius:100px;
  color:var(--t2);font-family:var(--sans);
  font-size:.8rem;font-weight:600;
  cursor:pointer;transition:all .18s var(--ease);
  white-space:nowrap;
}
.mode-btn:hover{border-color:var(--bdr2);color:var(--t1);transform:translateY(-1px)}
.mode-btn.active{
  background:var(--gold-a10);
  border-color:var(--gold-a30);
  color:var(--gold);
}

.run-btn{
  display:flex;align-items:center;gap:.45rem;
  padding:.52rem 1.35rem;
  background:var(--gold);color:#07080d;
  border:none;border-radius:100px;
  font-family:var(--sans);font-weight:800;font-size:.87rem;
  cursor:pointer;
  transition:all .2s var(--ease);
  white-space:nowrap;flex-shrink:0;
  margin-left:auto;
  box-shadow:0 4px 18px rgba(240,192,64,.3);
}
.run-btn:hover:not(:disabled){
  background:var(--gold2);
  transform:translateY(-2px);
  box-shadow:0 8px 28px rgba(240,192,64,.4);
}
.run-btn:active:not(:disabled){transform:translateY(0)}
.run-btn:disabled{opacity:.32;cursor:not-allowed;box-shadow:none}
.run-btn.busy{background:var(--surf3);color:var(--t2);box-shadow:none;cursor:not-allowed}
.run-arrow{transition:transform .18s var(--ease)}
.run-btn:hover:not(:disabled) .run-arrow{transform:translateX(3px)}

/* ── OUTPUT CARD ──────────────────────────────────────────── */
.output-card{animation:cardIn .32s var(--ease)}
@keyframes cardIn{
  from{opacity:0;transform:translateY(20px) scale(.99)}
  to{opacity:1;transform:none}
}

.out-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:.9rem 1.2rem;
  border-bottom:1px solid var(--bdr);
  background:var(--surf2);
}
.out-title-row{display:flex;align-items:center;gap:.55rem}
.out-icon{font-size:1rem}
.out-title{font-family:var(--mono);font-size:.72rem;color:var(--t2);text-transform:uppercase;letter-spacing:1.5px}
.source-tag{
  font-family:var(--mono);font-size:.63rem;
  padding:.18rem .65rem;border-radius:100px;
  text-transform:uppercase;letter-spacing:.5px;
}
.source-tag.gemini{background:var(--blue-a);color:var(--blue);border:1px solid rgba(79,142,240,.2)}
.source-tag.groq{background:var(--green-a);color:var(--green);border:1px solid rgba(52,211,153,.2)}
.source-tag.error{background:rgba(248,113,113,.1);color:var(--red);border:1px solid rgba(248,113,113,.2)}
.out-btns{display:flex;gap:.4rem}
.out-btn{
  display:flex;align-items:center;gap:.3rem;
  padding:.32rem .7rem;
  background:none;border:1px solid var(--bdr);
  border-radius:var(--r-xs);
  color:var(--t2);font-family:var(--sans);font-size:.78rem;font-weight:600;
  cursor:pointer;transition:all .16s;
}
.out-btn:hover{border-color:var(--bdr2);color:var(--t1)}

/* ── LOADING ──────────────────────────────────────────────── */
.loading{
  display:flex;flex-direction:column;align-items:center;
  gap:.9rem;padding:2.8rem 1.5rem;
}
.loading-bars{
  display:flex;align-items:flex-end;gap:5px;height:32px;
}
.loading-bars span{
  width:4px;border-radius:3px;
  background:linear-gradient(to top, var(--blue), var(--gold));
  animation:barAnim .8s ease-in-out infinite;
}
.loading-bars span:nth-child(1){animation-delay:0s}
.loading-bars span:nth-child(2){animation-delay:.1s}
.loading-bars span:nth-child(3){animation-delay:.2s}
.loading-bars span:nth-child(4){animation-delay:.3s}
.loading-bars span:nth-child(5){animation-delay:.4s}
@keyframes barAnim{
  0%,100%{height:8px;opacity:.3}
  50%{height:28px;opacity:1}
}
#loading-text{font-size:.88rem;color:var(--t2);font-weight:500}

/* ── FLASHCARD VIEWER ─────────────────────────────────────── */
.fc-viewer{padding:1.6rem 1.5rem;text-align:center}

.fc-top{display:flex;align-items:center;gap:1rem;margin-bottom:1.2rem}
.fc-progress-track{
  flex:1;height:3px;background:var(--surf3);
  border-radius:3px;overflow:hidden;
}
.fc-progress-fill{
  height:100%;background:linear-gradient(to right,var(--blue),var(--gold));
  border-radius:3px;transition:width .4s var(--ease);
}
.fc-count{font-family:var(--mono);font-size:.72rem;color:var(--t3);white-space:nowrap}

/* 3D flip card */
.fc-scene{perspective:1000px;margin-bottom:.8rem}
.fc-card{
  position:relative;width:100%;min-height:160px;
  transform-style:preserve-3d;
  transition:transform .5s cubic-bezier(.4,0,.2,1);
  cursor:pointer;
}
.fc-card.flipped{transform:rotateY(180deg)}
.fc-front,.fc-back{
  position:absolute;inset:0;
  backface-visibility:hidden;
  -webkit-backface-visibility:hidden;
  background:var(--surf2);border:1px solid var(--bdr2);
  border-radius:var(--r);
  padding:1.8rem 1.5rem;
  display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:.6rem;
  transition:border-color .3s;
}
.fc-front:hover,.fc-back:hover{border-color:var(--bdr3)}
.fc-back{
  transform:rotateY(180deg);
  border-color:rgba(52,211,153,.25);
  background:rgba(52,211,153,.04);
}
.fc-side-label{
  font-family:var(--mono);font-size:.64rem;
  color:var(--t3);text-transform:uppercase;letter-spacing:1px;
}
.fc-text{font-size:.95rem;font-weight:500;line-height:1.65;color:var(--t1)}
.fc-back .fc-text{color:var(--green)}

.fc-hint{font-size:.72rem;color:var(--t3);font-family:var(--mono);margin-bottom:.9rem}

.fc-btns{display:flex;justify-content:center;align-items:center;gap:.7rem}
.fc-nav-btn{
  padding:.42rem 1.05rem;
  background:var(--surf3);border:1px solid var(--bdr2);
  border-radius:var(--r-xs);
  color:var(--t2);font-family:var(--sans);font-size:.81rem;font-weight:600;
  cursor:pointer;transition:all .16s;
}
.fc-nav-btn:hover{color:var(--t1);border-color:var(--bdr3);transform:translateY(-1px)}
.fc-flip-btn{
  padding:.48rem 1.4rem;
  background:var(--gold-a10);border:1px solid var(--gold-a30);
  border-radius:var(--r-xs);
  color:var(--gold);font-family:var(--sans);font-weight:700;font-size:.84rem;
  cursor:pointer;transition:all .18s var(--ease);
}
.fc-flip-btn:hover{background:var(--gold-a20);transform:translateY(-1px)}

/* ── OUTPUT BODY ──────────────────────────────────────────── */
.out-body{
  padding:1.5rem 1.6rem;
  font-size:.94rem;line-height:1.88;
  color:var(--t1);white-space:pre-wrap;word-break:break-word;
  animation:fadeBody .3s ease;
}
@keyframes fadeBody{from{opacity:0}to{opacity:1}}

.out-body strong{color:var(--gold);font-weight:700}
.out-body em{color:var(--blue);font-style:italic}

.quiz-q{
  background:var(--surf2);
  border-left:3px solid var(--gold);
  padding:.9rem 1.1rem;
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  margin:.9rem 0 .35rem;font-weight:600;
  animation:slideRight2 .25s var(--ease);
}
@keyframes slideRight2{from{opacity:0;transform:translateX(-8px)}to{opacity:1;transform:none}}
.ans-line{color:var(--green);font-family:var(--mono);font-size:.83rem;padding:.25rem 0}
.exp-line{color:var(--t2);font-size:.84rem;font-style:italic;padding:.15rem 0 .8rem}
.sec-head{color:var(--blue);font-weight:700;margin-top:1rem}
.mm-branch{color:var(--violet);font-weight:700}
.mm-sub{color:var(--t2);padding-left:1rem}

/* ── FOLLOW-UP ────────────────────────────────────────────── */
.followup{
  padding:.9rem 1.6rem 1.2rem;
  border-top:1px solid var(--bdr);
  background:rgba(79,142,240,.03);
}
.fu-label{font-size:.72rem;font-weight:700;color:var(--t3);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.55rem}
.fu-chips{display:flex;flex-wrap:wrap;gap:.38rem}
.chip{
  padding:.34rem .88rem;
  background:none;border:1px solid var(--bdr);
  border-radius:100px;
  color:var(--t2);font-family:var(--sans);font-size:.8rem;font-weight:600;
  cursor:pointer;transition:all .18s var(--ease);
}
.chip:hover{
  border-color:rgba(79,142,240,.4);
  color:var(--blue);background:var(--blue-a);
  transform:translateY(-1px);
}

/* ── FOOTER ───────────────────────────────────────────────── */
footer{
  text-align:center;padding:1.4rem 1.5rem;
  border-top:1px solid var(--bdr);
  color:var(--t3);font-size:.79rem;
  position:relative;z-index:1;
}
footer a{color:var(--blue);text-decoration:none}
footer a:hover{text-decoration:underline}

/* ── SCROLLBAR ────────────────────────────────────────────── */
::-webkit-scrollbar{width:4px;height:4px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--surf3);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--t4)}

/* ── UTILITY ──────────────────────────────────────────────── */
.hidden{display:none!important}

/* ── RESPONSIVE ───────────────────────────────────────────── */

/* Tablet — 768px */
@media(max-width:768px){
  .hero{padding:4rem 1.2rem 2.8rem}
  .hero-h1{font-size:2.8rem;letter-spacing:-1.5px}
  main{padding:0 1.2rem 4rem}
  .mode-group{flex-wrap:wrap}
}

/* Mobile — 640px */
@media(max-width:640px){
  /* Header */
  header{padding:.7rem 1rem}
  .nav-btn{padding:.35rem .5rem}
  .nav-btn span:last-child{display:none} /* hide text, keep icon */
  .logo-text{font-size:1rem}
  .status-chip{padding:.28rem .6rem;font-size:.65rem}

  /* Hero */
  .hero{padding:3rem 1rem 2rem}
  .hero-h1{font-size:2.1rem;letter-spacing:-1.2px}
  .hero-p{font-size:.88rem}
  .d-br{display:none}
  .feature-row{gap:.4rem}
  .ftag{font-size:.75rem;padding:.3rem .75rem}

  /* Main */
  main{padding:0 .9rem 3.5rem;gap:1rem}

  /* Card tabs */
  .tab{padding:.72rem .9rem;font-size:.8rem}

  /* Textarea */
  textarea{min-height:150px;font-size:.9rem;padding:1rem 1.1rem}

  /* Action bar — stack vertically */
  .action-bar{
    flex-direction:column;
    align-items:stretch;
    gap:.65rem;
    padding:.8rem .9rem;
  }
  .mode-group{
    justify-content:flex-start;
    gap:.3rem;
    overflow-x:auto;
    padding-bottom:.2rem;
    scrollbar-width:none;
    -ms-overflow-style:none;
  }
  .mode-group::-webkit-scrollbar{display:none}
  .mode-btn{
    font-size:.78rem;
    padding:.35rem .8rem;
    flex-shrink:0; /* prevent squishing — horizontal scroll instead */
  }
  .run-btn{
    margin-left:0;
    width:100%;
    justify-content:center;
    padding:.6rem;
    font-size:.9rem;
  }

  /* Output card */
  .out-head{
    flex-direction:column;
    align-items:flex-start;
    gap:.55rem;
    padding:.8rem 1rem;
  }
  .out-btns{width:100%;justify-content:flex-start}
  .out-body{padding:1.1rem 1rem;font-size:.9rem}

  /* Flashcard */
  .fc-viewer{padding:1.2rem 1rem}
  .fc-btns{
    flex-wrap:wrap;
    justify-content:center;
    gap:.5rem;
  }
  .fc-nav-btn,.fc-flip-btn{flex:1;min-width:90px;text-align:center;justify-content:center}

  /* Drawers — full width on mobile */
  .drawer,#history-drawer{
    width:100%;
    border-right:none;
    border-left:none;
    border-bottom:1px solid var(--bdr2);
    bottom:auto;
    max-height:75vh;
    overflow-y:auto;
  }

  /* Follow-up chips */
  .fu-chips{gap:.3rem}
  .chip{font-size:.76rem;padding:.3rem .75rem}

  /* File bar */
  .file-name{font-size:.78rem}
  .dropzone{padding:2rem .8rem}

  /* Footer */
  footer{font-size:.72rem;padding:1rem}
}

/* Small mobile — 400px */
@media(max-width:400px){
  header{padding:.65rem .8rem}
  .logo-text{font-size:.9rem}
  .hero-h1{font-size:1.85rem;letter-spacing:-1px}
  .hero-pill{font-size:.62rem;padding:.28rem .8rem}
  .hero-p{font-size:.82rem}
  .tab{padding:.65rem .75rem;font-size:.75rem}
  .mode-btn{font-size:.73rem;padding:.3rem .7rem}
  .out-title-row{flex-wrap:wrap;gap:.4rem}
}