:root{
  --bg:#f6f7f9; --surface:#fff; --surface-2:#f1f2f4;
  --ink:#0e1318; --ink-2:#3c4043; --muted:#6b7280;
  --line:#e5e7eb; --line-2:#d1d5db;
  --accent:#7c3aed; --spark:linear-gradient(135deg,#7d2ae8,#00c4cc);
  --ok:#0ca678; --err:#e8453c;
  --r-in:10px; --r-card:14px; --r-panel:18px;
  --sh-card:0 1px 3px rgba(16,19,24,.05);
  --sh-hover:0 10px 28px rgba(124,58,237,.12);
  --sh-float:0 16px 48px rgba(16,19,24,.18);
  --ease:cubic-bezier(.4,0,.2,1);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  background:var(--bg); color:var(--ink);
  font:400 15px/1.5 Inter,"Segoe UI",system-ui,-apple-system,Roboto,sans-serif;
  -webkit-font-smoothing:antialiased; height:100%; overflow:hidden;
}
button{font:inherit;cursor:pointer}
button:disabled{opacity:.5;cursor:not-allowed}
h1,h2{margin:0}
input,select,textarea{
  font:inherit;color:var(--ink);background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-in);padding:10px 12px;width:100%;outline:none;
  transition:border-color .15s var(--ease),box-shadow .15s var(--ease);
}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(124,58,237,.18)}
textarea{resize:vertical;min-height:62px}
input[type=color]{height:40px;padding:3px}
label{display:block;font:510 12.5px/1.4 inherit;color:var(--muted);margin:0 0 6px}
.row{display:flex;gap:12px}.row>*{flex:1}
.row.tight{gap:8px}
.field{margin-bottom:16px}
[hidden]{display:none!important}
.pill{display:inline-block;font:700 11px/1 inherit;letter-spacing:.04em;text-transform:uppercase;
  color:var(--muted);background:var(--surface-2);border-radius:9999px;padding:4px 9px;vertical-align:middle}

/* buttons */
.btn{background:var(--surface);border:1px solid var(--line);color:var(--ink);border-radius:var(--r-in);
  padding:10px 16px;font:590 14px/1.2 inherit;transition:.15s var(--ease)}
.btn:hover:not(:disabled){background:var(--surface-2);border-color:var(--line-2)}
.btn.primary{background:var(--spark);border:none;color:#fff;box-shadow:0 2px 10px rgba(125,42,232,.22)}
.btn.primary:hover:not(:disabled){filter:brightness(1.06)}
.btn.ghost{background:transparent;border-color:transparent}
.btn.ghost:hover:not(:disabled){background:var(--surface-2)}
.btn.lg{width:100%;padding:13px;font-size:15px;margin-top:4px}
.btn.sm{width:auto;flex:none;padding:9px 12px}

/* topbar */
.topbar{height:56px;display:flex;align-items:center;gap:10px;padding:0 20px;
  background:var(--surface);border-bottom:1px solid var(--line)}
.logo{background:none;border:none;font:700 16px/1 inherit;color:var(--ink);letter-spacing:-.01em;padding:6px 4px}
.crumb{background:var(--surface-2);border:none;color:var(--ink-2);font:510 13px/1 inherit;
  padding:6px 12px;border-radius:9999px}
.crumb::before{content:"‹ ";color:var(--muted)}
.grow{flex:1}

/* HOME */
.home{height:calc(100% - 56px);display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:24px;text-align:center;animation:fade .24s var(--ease)}
.hero{font:700 32px/1.1 inherit;letter-spacing:-.02em}
.hero-sub{color:var(--muted);margin:10px 0 36px;font-size:16px}
.modes{display:flex;gap:20px;flex-wrap:wrap;justify-content:center;max-width:840px}
.mode-card{position:relative;overflow:hidden;width:240px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-panel);padding:28px 22px;text-align:left;display:flex;flex-direction:column;gap:8px;
  box-shadow:var(--sh-card);transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease)}
.mode-card:hover{transform:translateY(-2px);box-shadow:var(--sh-hover);border-color:transparent}
.mode-card::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--spark);
  opacity:0;transition:opacity .18s var(--ease)}
.mode-card:hover::after{opacity:1}
.mode-ico{font-size:34px;line-height:1}
.mode-name{font:590 18px/1.2 inherit}
.mode-desc{color:var(--muted);font-size:13.5px}

/* STUDIO */
.studio{height:calc(100% - 56px);display:grid;grid-template-columns:320px 1fr 360px;
  gap:0;animation:fade .24s var(--ease)}
.composer{border-right:1px solid var(--line);background:var(--surface);padding:22px;overflow-y:auto}
.composer h2{font:590 20px/1.2 inherit;letter-spacing:-.01em;margin-bottom:18px}
.hint{color:var(--muted);font-size:12.5px;margin:12px 0 0}
.side{border-left:1px solid var(--line);background:var(--surface);padding:18px;overflow-y:auto;display:flex;flex-direction:column;gap:16px}
.panel h2{font:590 15px/1.2 inherit;margin-bottom:14px}
.note{font-size:13px;color:var(--ink-2);background:var(--surface-2);border-radius:var(--r-card);padding:12px;margin:0;line-height:1.5}
.caption{min-height:130px;margin-top:10px}

/* stage */
.stage{display:flex;flex-direction:column;min-width:0;padding:24px;overflow:auto;gap:16px}
.preview-wrap{flex:1;display:flex;align-items:center;justify-content:center;min-height:0;position:relative}
.preview-wrap .empty-msg{display:none;color:var(--muted)}
.preview-wrap.empty .empty-msg{display:block}
.preview-wrap.empty #preview,.preview-wrap.empty #preview-video{display:none}
#preview,#preview-video{max-height:66vh;max-width:100%;border-radius:14px;
  box-shadow:0 12px 40px rgba(16,19,24,.16);background:#fff;display:block}
.stage-actions{display:flex;gap:10px;justify-content:center;flex:none}
.stage-actions .btn{width:auto}

/* thumbs */
.thumbs{display:flex;gap:10px;overflow-x:auto;flex:none;min-height:0;padding:2px}
.thumb{position:relative;flex:none;width:74px;cursor:pointer;border-radius:10px;padding:3px;border:2px solid transparent}
.thumb.active{border-color:var(--accent)}
.thumb-cv{width:68px;height:85px;object-fit:cover;border-radius:7px;background:var(--surface-2);display:block;box-shadow:var(--sh-card)}
.thumb-cap{font:510 10px/1.2 inherit;color:var(--muted);text-align:center;margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.thumb-del{position:absolute;top:0;right:0;width:18px;height:18px;border-radius:50%;border:none;
  background:rgba(14,19,24,.7);color:#fff;font-size:13px;line-height:1;padding:0;display:none}
.thumb:hover .thumb-del{display:block}

/* upload */
.upload{display:flex;gap:10px;align-items:center}
.prev{width:52px;height:52px;border-radius:10px;border:1px dashed var(--line-2);background:var(--surface-2) center/cover no-repeat;flex:none}
.upload input[type=file]{font-size:12px;padding:7px}

/* brand drawer */
.scrim{position:fixed;inset:0;background:rgba(14,19,24,.32);z-index:40;animation:fade .2s var(--ease)}
.drawer{position:fixed;top:0;right:0;bottom:0;width:380px;max-width:92vw;background:var(--surface);
  z-index:41;box-shadow:var(--sh-float);display:flex;flex-direction:column;animation:slidein .24s var(--ease)}
.drawer header{display:flex;align-items:center;padding:18px 20px;border-bottom:1px solid var(--line)}
.drawer header h2{font:590 16px/1.2 inherit;flex:1}
.drawer .x{background:none;border:none;font-size:24px;color:var(--muted);line-height:1;padding:0 4px}
.drawer-body{padding:20px;overflow-y:auto}

/* overlay + toast */
.overlay{position:fixed;inset:0;background:rgba(246,247,249,.72);backdrop-filter:blur(3px);display:none;
  align-items:center;justify-content:center;z-index:50;flex-direction:column;gap:16px}
.overlay.show{display:flex}
.spinner{width:40px;height:40px;border:3px solid rgba(124,58,237,.18);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
#overlay-msg{color:var(--ink-2);font:510 14px/1 inherit}
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%) translateY(20px);background:#fff;
  border:1px solid var(--line);color:var(--ink);padding:12px 18px;border-radius:12px;max-width:560px;opacity:0;
  pointer-events:none;transition:.2s var(--ease);z-index:60;box-shadow:var(--sh-float);font-size:14px}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.ok{border-color:var(--ok)} .toast.err{border-color:var(--err)}

@keyframes spin{to{transform:rotate(360deg)}}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@keyframes slidein{from{transform:translateX(24px);opacity:.4}to{transform:none;opacity:1}}

/* responsive */
@media(max-width:1100px){
  .studio{grid-template-columns:300px 1fr}
  .side{grid-column:1/-1;border-left:none;border-top:1px solid var(--line);flex-direction:row;flex-wrap:wrap}
  .side .panel{flex:1;min-width:280px}
}
@media(max-width:720px){
  body{overflow:auto}
  .studio{display:block;height:auto}
  .composer,.side{border:none;border-bottom:1px solid var(--line)}
  .mode-card{width:100%}
  #preview,#preview-video{max-height:54vh}
}