/* ═══════════════════════════════════════════════════════
   ChatLab · Light · Two-Column · Crystal Cards
   Left 2/3: Import + Functions
   Right 1/3: Preview Panel
   ═══════════════════════════════════════════════════════ */

:root {
  --bg:      #f8f9fb;
  --card:    #ffffff;
  --hover:   #f3f4f6;
  --border:  #e8eaef;
  --txt:     #111827;
  --soft:    #374151;
  --muted:   #6b7280;
  --dim:     #9ca3af;
  --acc:     #6366f1;
  --acc-h:   #4f46e5;
  --acc-s:   #eef2ff;
  --green:   #16a34a;
  --green-s: #f0fdf4;
  --red:     #dc2626;
  --red-s:   #fef2f2;
  --amber:   #d97706;
  --sh-sm:   0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
  --sh-md:   0 4px 16px rgba(0,0,0,0.05), 0 1px 4px rgba(0,0,0,0.04);
  --sh-lg:   0 12px 40px rgba(0,0,0,0.10), 0 2px 8px rgba(0,0,0,0.06);
  --sh-xl:   0 20px 60px rgba(0,0,0,0.14);
  --crystal-border: rgba(0,0,0,0.05);
  --crystal-sh:  0 4px 24px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03), inset 0 1px 0 rgba(255,255,255,0.8);
  --crystal-sh-h: 0 8px 36px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05), inset 0 1px 0 rgba(255,255,255,0.9);
  --r:       12px;
  --r-sm:    8px;
  --font:    'Inter','Noto Sans SC',system-ui,sans-serif;
  --ease:    cubic-bezier(0.16,1,0.3,1);
}

html,body{margin:0;padding:0;height:100vh;overflow:hidden;background:var(--bg);}
html{-webkit-font-smoothing:antialiased;}
body{font-family:var(--font);font-size:.88rem;color:var(--txt);display:flex;flex-direction:column;}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
button{font:inherit;cursor:pointer;border:none;background:none;}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px;}

/* ── Topbar ─────────────────────────────────────── */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:.65rem 1.4rem;flex-shrink:0;border-bottom:1px solid var(--border);
  background:var(--card);
}
.logo{
  font-size:.8rem;font-weight:500;color:var(--muted);
  text-decoration:none;transition:color .15s;
}
.logo:hover{color:var(--txt);}

.badge{
  font-size:.7rem;color:var(--dim);padding:.15rem .55rem;border-radius:99px;
  background:var(--hover);opacity:0;transition:opacity .25s;
}
.badge.on{opacity:1;color:var(--green);}

/* ── Layout ─────────────────────────────────────── */
.layout{
  flex:1 1 0;min-height:0;display:grid;
  grid-template-columns:2fr 1fr;gap:0;
  overflow:hidden;
}

/* ── Left Panel ─────────────────────────────────── */
.left{
  display:flex;flex-direction:column;gap:.7rem;
  padding:1rem 1rem 1rem 1.4rem;overflow-y:auto;
}
.left::-webkit-scrollbar{width:4px;}
.left::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px;}

/* ── Crystal Card ───────────────────────────────── */
.card{
  background:var(--card);
  border:1px solid var(--crystal-border);
  border-radius:var(--r);
  box-shadow:var(--crystal-sh);
  transition:all .25s var(--ease);
}
.card:hover{
  box-shadow:var(--crystal-sh-h);
}

/* Import card */
.import-card{padding:1rem 1.1rem;display:flex;flex-direction:column;gap:.6rem;}
.import-card .card-hd{
  display:flex;align-items:center;gap:.45rem;
  font-size:.78rem;font-weight:600;color:var(--soft);
}
.import-card .card-hd svg{color:var(--acc);flex-shrink:0;}

/* Drop zone */
.drop{
  border:2px dashed var(--border);border-radius:var(--r-sm);
  padding:.8rem;text-align:center;cursor:pointer;
  background:var(--bg);transition:all .15s;
}
.drop:hover,.drop.on{border-color:var(--acc);background:var(--acc-s);}
.drop-ic{color:var(--dim);margin-bottom:.2rem;}
.drop-tx{font-size:.75rem;color:var(--muted);}
.drop-hi{font-size:.65rem;color:var(--dim);margin-top:.15rem;}

/* Form */
.fg-ta{
  width:100%;padding:.5rem .65rem;border:1px solid var(--border);
  border-radius:var(--r-sm);font:inherit;font-size:.76rem;
  color:var(--txt);background:var(--bg);resize:none;
  transition:border-color .15s,box-shadow .15s;
}
.fg-ta:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px rgba(99,102,241,0.15);}
.fg-ta::placeholder{color:var(--dim);}

.fg-row{display:flex;align-items:center;gap:.7rem;}
.fg-in{
  flex:1;padding:.45rem .6rem;border:1px solid var(--border);
  border-radius:var(--r-sm);font:inherit;font-size:.76rem;
  color:var(--txt);background:var(--bg);
  transition:border-color .15s,box-shadow .15s;
}
.fg-in:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px rgba(99,102,241,0.15);}
.fg-in::placeholder{color:var(--dim);}

.chk{display:flex;align-items:center;gap:.35rem;font-size:.72rem;color:var(--muted);white-space:nowrap;cursor:pointer;}
.chk input{accent-color:var(--acc);width:14px;height:14px;cursor:pointer;}

.sub{
  width:100%;padding:.55rem;border-radius:var(--r-sm);
  background:var(--acc);color:#fff;font-size:.78rem;font-weight:600;
  transition:all .15s;
}
.sub:hover{background:var(--acc-h);box-shadow:0 4px 16px rgba(99,102,241,0.25);}
.sub:active{transform:scale(.98);}

/* ── Function Cards ─────────────────────────────── */
.fn-cards{display:flex;flex-direction:column;gap:.55rem;}
.fn-card{
  display:flex;align-items:center;gap:.8rem;
  padding:.85rem 1rem;text-align:left;width:100%;
}
.fn-card:hover{transform:translateY(-1px);}
.fn-card:active{transform:translateY(0) scale(.99);}
.fn-card svg{color:var(--muted);flex-shrink:0;transition:color .2s;}
.fn-card:hover svg{color:var(--acc);}
.fn-label{font-size:.82rem;font-weight:600;color:var(--txt);}
.fn-hint{font-size:.68rem;color:var(--dim);display:block;margin-top:.1rem;}

/* ── Right Panel ────────────────────────────────── */
.right{
  border-left:1px solid var(--border);background:var(--card);
  display:flex;flex-direction:column;overflow:hidden;
}

.preview-empty{
  flex:1;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:.6rem;
  color:var(--dim);font-size:.78rem;text-align:center;line-height:1.6;
}

.preview-content{
  flex:1;display:flex;flex-direction:column;overflow:hidden;
}

.preview-bar{
  padding:.55rem .9rem;font-size:.7rem;font-weight:500;
  color:var(--muted);border-bottom:1px solid var(--border);
  background:var(--bg);flex-shrink:0;
}

.preview-msgs{
  flex:1 1 0;min-height:0;overflow-y:auto;padding:.6rem .8rem;
}
.preview-msgs::-webkit-scrollbar{width:4px;}
.preview-msgs::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px;}

/* Message bubbles */
.bub{max-width:88%;padding:.35rem .55rem;border-radius:8px;margin-bottom:.3rem;font-size:.74rem;line-height:1.5;}
.bub-u{background:var(--acc-s);border:1px solid #e0e7ff;margin-left:auto;text-align:right;}
.bub-o{background:var(--bg);border:1px solid var(--border);margin-right:auto;}
.bub-s{font-size:.6rem;font-weight:600;margin-bottom:1px;}
.bub-su{color:var(--acc);}
.bub-so{color:var(--muted);}
.bub-empty{text-align:center;padding:2rem 1rem;color:var(--dim);font-size:.76rem;}

/* ── Modal ──────────────────────────────────────── */
.modal{
  position:fixed;inset:0;z-index:100;display:flex;
  align-items:center;justify-content:center;
  background:rgba(0,0,0,.3);backdrop-filter:blur(4px);
  -webkit-backdrop-filter:blur(4px);
  opacity:0;pointer-events:none;transition:opacity .2s var(--ease);
}
.modal.open{opacity:1;pointer-events:auto;}
.modal-card{
  background:var(--card);border-radius:14px;width:94%;max-width:680px;
  max-height:90vh;display:flex;flex-direction:column;
  box-shadow:var(--sh-xl);
  transform:translateY(12px) scale(.98);
  transition:transform .25s cubic-bezier(.34,1.56,.64,1);
}
.modal.open .modal-card{transform:translateY(0) scale(1);}
.modal-hd{
  display:flex;align-items:center;justify-content:space-between;
  padding:.9rem 1.2rem;border-bottom:1px solid var(--border);flex-shrink:0;
}
.modal-ti{font-size:.9rem;font-weight:600;}
.modal-x{
  display:flex;align-items:center;justify-content:center;
  width:28px;height:28px;border-radius:var(--r-sm);
  color:var(--muted);transition:all .15s;
}
.modal-x:hover{background:var(--hover);color:var(--txt);}
.modal-bd{padding:1.2rem;overflow-y:auto;flex:1 1 0;min-height:0;}
.modal-bd::-webkit-scrollbar{width:4px;}
.modal-bd::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px;}

/* Results */
.rs{margin-bottom:.8rem;}
.rs-l{
  font-size:.65rem;font-weight:600;color:var(--muted);
  text-transform:uppercase;letter-spacing:.04em;margin-bottom:.25rem;
}
.met{text-align:center;padding:.5rem 0;}
.met-v{font-size:2.8rem;font-weight:700;letter-spacing:-.03em;line-height:1;}
.met-l{font-size:.62rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-top:.25rem;}
.tag{
  display:inline-block;padding:.15rem .55rem;border-radius:99px;
  font-size:.68rem;font-weight:500;background:var(--acc-s);color:var(--acc-h);
}
.box{
  background:var(--bg);border:1px solid var(--border);border-radius:var(--r-sm);
  padding:.55rem .7rem;font-size:.76rem;color:var(--soft);line-height:1.6;
}
.box.ok{background:var(--green-s);border-color:#bbf7d0;color:#166534;}
.box.er{background:var(--red-s);border-color:#fecaca;color:#991b1b;}
.step{display:flex;align-items:flex-start;gap:.45rem;margin-bottom:.35rem;font-size:.76rem;color:var(--soft);}
.step-n{
  display:inline-flex;align-items:center;justify-content:center;
  width:18px;height:18px;border-radius:50%;background:var(--acc-s);
  color:var(--acc-h);font-size:.6rem;font-weight:600;flex-shrink:0;
}
hr.dv{border:none;border-top:1px solid var(--border);margin:.6rem 0;}

/* Spinner */
.spin-w{display:flex;flex-direction:column;align-items:center;gap:.6rem;padding:1.5rem 0;}
.spin{width:26px;height:26px;border:3px solid var(--border);border-top-color:var(--acc);border-radius:50%;animation:spin .65s linear infinite;}
@keyframes spin{to{transform:rotate(360deg);}}
.spin-tx{font-size:.76rem;color:var(--muted);}

/* Toast */
.toast{
  position:fixed;bottom:1.2rem;left:50%;transform:translateX(-50%) translateY(80px);
  padding:.5rem 1rem;border-radius:var(--r-sm);background:var(--txt);
  color:#fff;font-size:.74rem;font-weight:500;box-shadow:var(--sh-lg);
  z-index:200;opacity:0;transition:all .25s var(--ease);pointer-events:none;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}
.toast.ok{background:var(--green);}
.toast.bad{background:var(--red);}

/* ── Responsive ─────────────────────────────────── */
@media(max-width:768px){
  .layout{grid-template-columns:1fr;}
  .right{display:none;}
  .left{padding:.8rem;}
  .modal-card{max-width:96%;max-height:92vh;}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;}
}