/* ==========================================================================
   CTAI Studio — design tokens
   Palette: near-black canvas, warm gold accent (product/tool identity),
   green = free, gold = paid, muted grey = coming soon.
   Type: Sora (display, heavy) + Manrope (body/UI)
   ========================================================================== */
:root{
  --bg:            #0a0a0c;
  --bg-alt:        #101013;
  --surface:       #141417;
  --surface-2:     #1b1b1f;
  --border:        #26262b;
  --text:          #f5f5f7;
  --text-muted:    #9a9ba3;
  --text-faint:    #5c5d66;
  --accent:        #ffc22b;
  --accent-ink:    #1a1204;
  --accent-soft:   rgba(255,194,43,.12);
  --free:          #34d399;
  --free-soft:     rgba(52,211,153,.12);
  --paid:          #ffc22b;
  --danger:        #f97066;
  --radius-s:      8px;
  --radius-m:      14px;
  --radius-l:      22px;
  --font-display:  'Sora', 'Manrope', system-ui, sans-serif;
  --font-body:     'Manrope', system-ui, -apple-system, sans-serif;
  --container:     1240px;
}

/* ---------- base ---------- */
html{ background:var(--bg); }
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{ font-family:var(--font-display); font-weight:800; line-height:1.15; margin:0 0 .5em; letter-spacing:-.01em; }
p{ margin:0 0 1em; color:var(--text-muted); }
a{ transition:color .15s ease, opacity .15s ease, background-color .15s ease, border-color .15s ease; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; }
ul{ list-style:none; margin:0; padding:0; }
.ctai-container{ max-width:var(--container); margin:0 auto; padding:0 24px; }

@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; }
}

/* ---------- header ---------- */
.ctai-header{
  position:sticky; top:0; z-index:50;
  background:rgba(10,10,12,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.ctai-header__inner{ display:flex; align-items:center; gap:32px; height:72px; }
.ctai-logo{ display:flex; align-items:baseline; font-family:var(--font-display); font-weight:800; font-size:20px; letter-spacing:.01em; white-space:nowrap; }
.ctai-logo__ctai{ color:var(--accent); }
.ctai-logo__studio{ color:var(--text); }
.ctai-nav{ flex:1; display:flex; justify-content:center; }
.ctai-nav-list{ display:flex; gap:36px; }
.ctai-nav-list a{ color:var(--text); font-weight:600; font-size:15px; opacity:.85; }
.ctai-nav-list a:hover{ opacity:1; color:var(--accent); }
.ctai-header__actions{ display:flex; align-items:center; gap:14px; }
.ctai-lang{ display:flex; background:var(--surface-2); border-radius:999px; padding:3px; }
.ctai-lang__btn{ border:0; background:transparent; color:var(--text-muted); font-weight:700; font-size:12px; padding:6px 12px; border-radius:999px; cursor:pointer; }
.ctai-lang__btn.is-active{ background:var(--accent); color:var(--accent-ink); }
.ctai-nav-toggle{ display:none; flex-direction:column; gap:4px; background:none; border:0; cursor:pointer; padding:8px; }
.ctai-nav-toggle span{ width:22px; height:2px; background:var(--text); display:block; }

/* buttons */
.ctai-btn{ display:inline-flex; align-items:center; justify-content:center; gap:8px; font-weight:700; font-size:14px; padding:12px 22px; border-radius:999px; border:1px solid transparent; cursor:pointer; white-space:nowrap; }
.ctai-btn--sm{ padding:9px 18px; font-size:13px; }
.ctai-btn--primary{ background:var(--accent); color:var(--accent-ink); }
.ctai-btn--primary:hover{ filter:brightness(1.08); }
.ctai-btn--ghost{ background:var(--surface-2); color:var(--text); border-color:var(--border); }
.ctai-btn--ghost:hover{ border-color:var(--accent); }
.ctai-btn--outline{ background:transparent; color:var(--text); border-color:var(--border); }
.ctai-btn--outline:hover{ border-color:var(--accent); color:var(--accent); }
.ctai-btn--block{ display:flex; width:100%; }
.ctai-btn.is-disabled{ opacity:.45; pointer-events:none; }

/* ---------- hero ---------- */
.ctai-hero{
  padding:88px 0 40px;
  text-align:center;
  background:
    radial-gradient(60% 60% at 50% 0%, rgba(255,194,43,.10), transparent 70%),
    var(--bg);
}
.ctai-eyebrow{ color:var(--accent); font-weight:800; font-size:12px; letter-spacing:.16em; text-transform:uppercase; margin-bottom:14px; }
.ctai-hero__title{ font-size:clamp(40px, 6vw, 68px); margin-bottom:20px; }
.ctai-hero__title--sm{ font-size:clamp(30px, 4vw, 44px); }
.ctai-hero__subtitle{ max-width:620px; margin:0 auto; font-size:17px; color:var(--text-muted); }

/* ---------- hero v2 (two-column, image4-style) ---------- */
.ctai-hero2{
  padding:72px 0 88px;
  background:
    radial-gradient(50% 60% at 15% 10%, rgba(255,194,43,.10), transparent 65%),
    var(--bg);
}
.ctai-hero2__inner{ display:grid; grid-template-columns:1.05fr .95fr; gap:56px; align-items:center; }
.ctai-hero2__col{ min-width:0; }
.ctai-hero2__badge{
  display:inline-flex; align-items:center; gap:8px; margin:0 0 20px;
  font-size:12px; font-weight:800; letter-spacing:.04em; color:var(--accent);
  background:var(--accent-soft); border:1px solid rgba(255,194,43,.28);
  padding:7px 14px; border-radius:999px;
}
.ctai-hero2__dot{ width:6px; height:6px; border-radius:50%; background:var(--accent); flex:none; }
.ctai-hero2__title{ font-size:clamp(34px,4.4vw,52px); line-height:1.1; margin-bottom:20px; }
.ctai-hero2__title-line1{ display:block; color:var(--text); }
.ctai-hero2__title-line2{ display:block; color:var(--accent); }
.ctai-hero2__desc{ max-width:540px; font-size:16px; color:var(--text-muted); margin-bottom:28px; }
.ctai-hero2__desc p{ margin:0; }
.ctai-hero2__actions{ display:flex; gap:14px; flex-wrap:wrap; margin-bottom:40px; }
.ctai-hero2__stats{ display:flex; gap:40px; flex-wrap:wrap; }
.ctai-hero2__stat strong{ display:block; font-family:var(--font-display); font-weight:800; font-size:22px; color:var(--text); }
.ctai-hero2__stat span{ font-size:12px; color:var(--text-faint); font-weight:600; }

/* console mockup */
.ctai-console{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-l); overflow:hidden; box-shadow:0 30px 60px -20px rgba(0,0,0,.55); }
.ctai-console__bar{ display:flex; align-items:center; gap:8px; padding:14px 18px; border-bottom:1px solid var(--border); background:var(--surface-2); }
.ctai-console__dot{ width:10px; height:10px; border-radius:50%; }
.ctai-console__dot--r{ background:#f97066; }
.ctai-console__dot--y{ background:#ffc22b; }
.ctai-console__dot--g{ background:#34d399; }
.ctai-console__name{ margin-left:8px; font-size:12px; color:var(--text-faint); font-weight:600; }
.ctai-console__status{ margin-left:auto; display:flex; align-items:center; gap:6px; font-size:11px; font-weight:800; color:var(--free); letter-spacing:.04em; }
.ctai-console__status-dot{ width:7px; height:7px; border-radius:50%; background:var(--free); box-shadow:0 0 8px var(--free); }
.ctai-console__panels{ display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--border); }
.ctai-console__panel{ background:var(--bg-alt); padding:16px; position:relative; }
.ctai-console__tag{ position:absolute; top:24px; left:24px; z-index:2; font-size:10px; font-weight:800; letter-spacing:.03em; padding:5px 9px; border-radius:6px; }
.ctai-console__tag--in{ background:var(--surface-2); color:var(--text-muted); }
.ctai-console__tag--out{ background:var(--accent); color:var(--accent-ink); }
.ctai-console__img{ aspect-ratio:4/5; border-radius:10px; overflow:hidden; background:#0d0d10 radial-gradient(circle at 50% 40%, #1b1b1f, #0a0a0c); display:flex; align-items:center; justify-content:center; }
.ctai-console__img img{ width:100%; height:100%; object-fit:cover; }
.ctai-console__placeholder{ font-family:var(--font-display); font-weight:800; font-size:22px; color:var(--text-faint); opacity:.5; }
.ctai-console__caption{ margin:10px 0 0; text-align:center; font-size:10px; letter-spacing:.08em; color:var(--text-faint); font-weight:700; text-transform:uppercase; }
.ctai-console__progress{ display:flex; align-items:center; justify-content:space-between; padding:14px 18px 0; font-size:12px; color:var(--text-faint); }
.ctai-console__progress-pct{ color:var(--accent); font-weight:800; }
.ctai-console__bar-track{ margin:10px 18px 18px; height:4px; border-radius:999px; background:var(--surface-2); overflow:hidden; }
.ctai-console__bar-fill{ height:100%; background:var(--accent); border-radius:999px; }

@media (max-width:900px){
  .ctai-hero2__inner{ grid-template-columns:1fr; }
  .ctai-hero2{ padding:48px 0 56px; }
}

/* ---------- stats bar ---------- */
.ctai-stats{ border-top:1px solid var(--border); border-bottom:1px solid var(--border); background:var(--bg-alt); }
.ctai-stats__inner{ display:flex; align-items:center; justify-content:center; gap:40px; padding:26px 0; flex-wrap:wrap; }
.ctai-stat{ text-align:center; }
.ctai-stat strong{ display:block; font-family:var(--font-display); font-weight:800; color:var(--accent); font-size:20px; }
.ctai-stat span{ font-size:11px; letter-spacing:.12em; color:var(--text-faint); font-weight:700; }
.ctai-stat-divider{ width:1px; height:28px; background:var(--border); }

/* ---------- catalog / section title / tabs ---------- */
.ctai-catalog{ padding:64px 0 100px; }
.ctai-section-title{ text-align:center; font-size:clamp(28px,4vw,40px); margin-bottom:28px; }
.ctai-page-head{ padding:64px 0 20px; text-align:center; }
.ctai-page-content{ padding:20px 0 80px; }

.ctai-tabs{ display:flex; justify-content:center; gap:10px; flex-wrap:wrap; margin-bottom:36px; }
.ctai-tab{ background:var(--surface); border:1px solid var(--border); color:var(--text-muted); font-weight:700; font-size:13px; padding:9px 18px; border-radius:999px; cursor:pointer; }
.ctai-tab.is-active, .ctai-tab:hover{ background:var(--accent); color:var(--accent-ink); border-color:var(--accent); }

/* ---------- grid & cards ---------- */
.ctai-grid{ display:grid; grid-template-columns:repeat(5, 1fr); gap:20px; }
.ctai-card{ position:relative; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-m); overflow:hidden; display:flex; flex-direction:column; transition:border-color .2s ease, transform .2s ease; }
.ctai-card:hover{ border-color:#3a3a41; transform:translateY(-3px); }
.ctai-card.is-coming-soon{ opacity:.55; }
.ctai-card__flag{ position:absolute; top:12px; left:12px; z-index:2; background:var(--accent); color:var(--accent-ink); font-size:10px; font-weight:800; letter-spacing:.06em; padding:5px 10px; border-radius:6px; }
.ctai-card__media{ aspect-ratio:1/1; display:flex; align-items:center; justify-content:center; background:#f4f1ea; overflow:hidden; }
.ctai-card__media img{ width:100%; height:100%; object-fit:cover; }
.ctai-card__initial{ font-family:var(--font-display); font-weight:800; font-size:34px; color:#0a0a0c; opacity:.35; }
.ctai-card__body{ padding:16px 18px 20px; display:flex; flex-direction:column; gap:6px; }
.ctai-card__cat{ font-size:11px; font-weight:700; color:var(--text-faint); letter-spacing:.06em; text-transform:uppercase; }
.ctai-card__title{ font-family:var(--font-display); font-size:17px; margin:0; }
.ctai-card__title a{ color:var(--text); }
.ctai-card__meta{ font-size:12px; color:var(--text-faint); margin:0; }
.ctai-badge{ display:inline-flex; width:fit-content; font-size:11px; font-weight:800; padding:3px 0; margin:2px 0 6px; }
.ctai-badge--free{ color:var(--free); }
.ctai-badge--paid{ color:var(--accent); }
.ctai-badge--muted{ color:var(--text-faint); }
.ctai-card__cta{ font-size:12px; font-weight:800; letter-spacing:.05em; color:var(--text-muted); text-transform:uppercase; }
.ctai-card__cta:hover{ color:var(--accent); }
.ctai-card__cta.is-disabled{ color:var(--text-faint); }
.ctai-card.is-hidden{ display:none; }

.ctai-empty{ text-align:center; padding:60px 20px; color:var(--text-muted); border:1px dashed var(--border); border-radius:var(--radius-m); }

.ctai-pagination{ display:flex; justify-content:center; gap:8px; margin-top:40px; }
.ctai-pagination a, .ctai-pagination span{ display:inline-flex; min-width:36px; height:36px; align-items:center; justify-content:center; border-radius:8px; background:var(--surface); border:1px solid var(--border); color:var(--text-muted); font-weight:700; font-size:13px; }
.ctai-pagination .current{ background:var(--accent); color:var(--accent-ink); border-color:var(--accent); }

/* ---------- blog list (Thư viện) ---------- */
.ctai-blog-list{ display:grid; grid-template-columns:repeat(2,1fr); gap:24px; }
.ctai-blog-item{ display:flex; gap:16px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-m); overflow:hidden; }
.ctai-blog-item__thumb{ width:140px; flex:none; background:#f4f1ea; display:flex; align-items:center; justify-content:center; }
.ctai-blog-item__thumb img{ width:100%; height:100%; object-fit:cover; }
.ctai-blog-item__body{ padding:16px 18px; }
.ctai-blog-item__body h3{ font-size:16px; margin-bottom:6px; }
.ctai-blog-item__body p{ font-size:13px; margin:0; }
.ctai-prose{ max-width:760px; color:var(--text-muted); }
.ctai-prose img{ border-radius:var(--radius-m); }

/* ---------- product detail page ---------- */
.ctai-detail{ padding:64px 0 100px; }
.ctai-detail__grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:48px; align-items:start; }
.ctai-pill{ display:inline-block; background:var(--accent); color:var(--accent-ink); font-size:11px; font-weight:800; letter-spacing:.06em; padding:6px 12px; border-radius:6px; margin-bottom:14px; }
.ctai-detail__title{ font-size:clamp(32px,4vw,48px); margin-bottom:16px; }
.ctai-detail__desc{ color:var(--text-muted); max-width:560px; }
.ctai-detail__desc p:last-child{ margin-bottom:0; }

.ctai-stats-row{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-m); padding:20px; margin:28px 0; }
.ctai-stat-box{ display:flex; flex-direction:column; gap:6px; }
.ctai-stat-box__label{ font-size:10px; letter-spacing:.12em; color:var(--text-faint); font-weight:800; }
.ctai-stat-box__value{ font-family:var(--font-display); font-size:20px; color:var(--text); }
.ctai-stat-box__value--accent{ color:var(--accent); }

.ctai-detail__actions{ display:flex; gap:12px; flex-wrap:wrap; margin-bottom:36px; }

.ctai-panel{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-m); padding:26px 28px; margin-bottom:24px; }
.ctai-panel__title{ font-size:15px; letter-spacing:.06em; margin-bottom:18px; }
.ctai-steps{ display:flex; flex-direction:column; gap:16px; counter-reset:step; }
.ctai-steps li{ display:flex; gap:14px; align-items:flex-start; color:var(--text); font-size:14px; }
.ctai-steps__num{ flex:none; width:26px; height:26px; border-radius:50%; background:var(--accent); color:var(--accent-ink); font-weight:800; font-size:12px; display:flex; align-items:center; justify-content:center; }
.ctai-panel--community h3{ font-size:19px; margin-bottom:8px; }
.ctai-panel--community p{ font-size:14px; }

.ctai-video{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-m); overflow:hidden; margin-bottom:24px; }
.ctai-video__frame{ position:relative; aspect-ratio:16/9; background:#000; }
.ctai-video__frame iframe{ width:100%; height:100%; border:0; }
.ctai-video__caption{ padding:16px 20px; font-size:13px; color:var(--text-muted); margin:0; }
.ctai-video__caption strong{ color:var(--text-faint); font-size:11px; letter-spacing:.1em; }

.ctai-panel--donate h3{ font-size:19px; margin-bottom:8px; }
.ctai-panel--donate p{ font-size:13px; }
.ctai-donate-amounts{ display:flex; gap:10px; margin:18px 0; }
.ctai-donate-amount{ flex:1; text-align:center; padding:12px 0; border-radius:10px; border:1px solid var(--border); background:var(--surface-2); font-weight:800; font-size:14px; color:var(--text-muted); }
.ctai-donate-amount.is-active{ background:var(--accent); color:var(--accent-ink); border-color:var(--accent); }
.ctai-donate-note{ font-size:12px; color:var(--text-faint); }
.ctai-bank-details{ margin-top:14px; border-top:1px solid var(--border); padding-top:14px; }
.ctai-bank-details summary{ cursor:pointer; color:var(--accent); font-weight:700; font-size:13px; }
.ctai-bank-details p{ font-size:13px; margin-top:10px; }

/* ---------- footer ---------- */
.ctai-footer{ border-top:1px solid var(--border); background:var(--bg-alt); padding-top:56px; }
.ctai-footer__inner{ display:flex; justify-content:space-between; gap:40px; flex-wrap:wrap; padding-bottom:40px; }
.ctai-footer__brand{ max-width:360px; }
.ctai-footer__desc{ font-size:13px; margin-top:14px; color:var(--text-muted); }
.ctai-footer__menu ul{ display:flex; gap:24px; }
.ctai-footer__menu a{ color:var(--text-muted); font-size:14px; }
.ctai-footer__social{ display:flex; gap:10px; align-items:flex-start; }
.ctai-social{ width:38px; height:38px; border-radius:50%; background:var(--surface-2); border:1px solid var(--border); display:flex; align-items:center; justify-content:center; font-size:11px; font-weight:800; color:var(--text-muted); }
.ctai-social:hover{ color:var(--accent); border-color:var(--accent); }
.ctai-footer__bottom{ border-top:1px solid var(--border); padding:20px 0; text-align:center; font-size:12px; color:var(--text-faint); }

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .ctai-grid{ grid-template-columns:repeat(3,1fr); }
}
@media (max-width:900px){
  .ctai-detail__grid{ grid-template-columns:1fr; }
  .ctai-blog-list{ grid-template-columns:1fr; }
}
@media (max-width:780px){
  .ctai-nav, .ctai-header__actions .ctai-btn{ display:none; }
  .ctai-nav-toggle{ display:flex; }
  .ctai-header.is-open .ctai-nav{ display:flex; position:absolute; top:72px; left:0; right:0; background:var(--bg); border-bottom:1px solid var(--border); padding:20px 0; }
  .ctai-header.is-open .ctai-nav-list{ flex-direction:column; align-items:center; gap:18px; width:100%; }
  .ctai-grid{ grid-template-columns:repeat(2,1fr); }
}
@media (max-width:520px){
  .ctai-grid{ grid-template-columns:1fr 1fr; gap:12px; }
  .ctai-card__body{ padding:12px 12px 16px; }
  .ctai-stats__inner{ gap:22px; }
  .ctai-stats-row{ grid-template-columns:1fr; }
}

/* ==========================================================================
   Language switch (VI / EN) — both versions render in the DOM, CSS shows one.
   Default = inline (for text inside headings/paragraphs/spans).
   Add class "i18n-block" on top of i18n-vi/i18n-en for multi-line content
   (paragraphs, description blocks, step lists) so it toggles as a block.
   ========================================================================== */
.i18n-en{ display:none; }
html.lang-en .i18n-vi{ display:none; }
html.lang-en .i18n-en{ display:inline; }

.i18n-block{ display:block; }
.i18n-block.i18n-en{ display:none; }
html.lang-en .i18n-block.i18n-vi{ display:none; }
html.lang-en .i18n-block.i18n-en{ display:block; }

/* ---------- header: logged-in state ---------- */
.ctai-user-menu{ display:flex; align-items:center; gap:12px; }
.ctai-user-menu__name{ font-size:13px; font-weight:700; color:var(--text-muted); max-width:140px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }

/* ---------- Clerk-style auth modal ---------- */
.ctai-modal-overlay{ position:fixed; inset:0; z-index:200; background:rgba(6,6,7,.72); backdrop-filter:blur(4px); display:flex; align-items:center; justify-content:center; padding:20px; }
.ctai-modal{ position:relative; width:100%; max-width:400px; background:#ffffff; color:#0f0f12; border-radius:18px; padding:30px 28px 22px; box-shadow:0 30px 60px rgba(0,0,0,.45); }
.ctai-modal__close{ position:absolute; top:16px; right:16px; background:none; border:0; font-size:20px; line-height:1; color:#8a8a92; cursor:pointer; padding:4px; }
.ctai-modal__close:hover{ color:#0f0f12; }
.ctai-modal__head{ text-align:center; margin-bottom:18px; }
.ctai-modal__head h2{ font-size:18px; color:#0f0f12; margin-bottom:6px; }
.ctai-modal__subtitle{ font-size:13px; color:#6b6b76; margin:0; }
.ctai-google-btn{ display:flex; justify-content:center; margin-bottom:16px; }
.ctai-modal__divider{ display:flex; align-items:center; gap:12px; margin:16px 0; color:#9a9aa2; font-size:12px; }
.ctai-modal__divider::before, .ctai-modal__divider::after{ content:''; flex:1; height:1px; background:#e6e6ea; }
.ctai-field-label{ display:block; font-size:13px; font-weight:700; color:#0f0f12; margin-bottom:6px; }
.ctai-input{ width:100%; padding:12px 14px; border-radius:10px; border:1px solid #e0e0e6; font-size:14px; font-family:var(--font-body); margin-bottom:14px; background:#fff; color:#0f0f12; }
.ctai-input:focus{ outline:none; border-color:var(--accent); }
.ctai-auth-error{ color:#d92d20; font-size:12.5px; background:#fef3f2; border:1px solid #fecdca; padding:8px 10px; border-radius:8px; margin:0 0 14px; }
.ctai-auth-submit{ width:100%; }
.ctai-modal__foot{ text-align:center; margin-top:18px; padding-top:16px; border-top:1px solid #eee; }
.ctai-modal__foot p{ font-size:13px; color:#6b6b76; margin:0 0 6px; }
.ctai-modal__foot a{ color:var(--accent-ink); font-weight:800; text-decoration:underline; }
.ctai-modal__secured{ font-size:11px; color:#b5b5bd; margin-top:6px !important; }

/* ---------- donation tiers as interactive buttons + bank QR ---------- */
.ctai-donate-amount{ font-family:var(--font-body); cursor:pointer; }
.ctai-donate-amount:hover{ border-color:var(--accent); }
.ctai-bank-body{ margin-top:14px; }
.ctai-bank-qr{ width:100%; max-width:280px; border-radius:10px; border:1px solid var(--border); margin-bottom:12px; }
.ctai-bank-amount{ font-size:13px; color:var(--text); margin-bottom:6px; }
.ctai-bank-amount strong{ color:var(--accent); }

/* ==========================================================================
   Trang Studio (render AI) — page-studio.php
   ========================================================================== */
.ctai-studioapp{ padding:28px 0 80px; min-height:70vh; }

.ctai-studioapp__toolbar{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  flex-wrap:wrap; margin-bottom:22px; padding-bottom:18px; border-bottom:1px solid var(--border);
}
.ctai-studioapp__tabs{ display:flex; gap:6px; flex-wrap:wrap; }
.ctai-studioapp__tab{
  background:transparent; border:1px solid transparent; color:var(--text-muted);
  font-weight:700; font-size:13px; padding:9px 14px; border-radius:10px; cursor:pointer;
}
.ctai-studioapp__tab:hover{ color:var(--text); background:var(--surface); }
.ctai-studioapp__tab.is-active{ color:var(--accent-ink); background:var(--accent); }

.ctai-studioapp__grid{ display:grid; grid-template-columns:300px 1fr 300px; gap:22px; align-items:start; }
.ctai-studioapp__side{ display:flex; flex-direction:column; gap:18px; position:sticky; top:96px; }

/* render category menu */
.ctai-catmenu{ position:relative; }
.ctai-catmenu__toggle{
  width:100%; display:flex; align-items:center; justify-content:space-between; gap:8px;
  background:var(--surface); border:1px solid var(--border); color:var(--text);
  font-family:var(--font-display); font-weight:800; font-size:16px;
  padding:14px 16px; border-radius:var(--radius-m); cursor:pointer;
}
.ctai-catmenu__toggle svg{ color:var(--text-faint); transition:transform .15s ease; flex:none; }
.ctai-catmenu.is-open .ctai-catmenu__toggle svg{ transform:rotate(180deg); }
.ctai-catmenu__list{
  display:none; position:absolute; z-index:20; left:0; right:0; top:calc(100% + 8px);
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-m);
  padding:8px; box-shadow:0 20px 40px rgba(0,0,0,.4);
}
.ctai-catmenu.is-open .ctai-catmenu__list{ display:block; }
.ctai-catmenu__item{
  width:100%; display:flex; align-items:center; gap:12px; background:transparent; border:0;
  padding:8px; border-radius:10px; cursor:pointer; text-align:left;
}
.ctai-catmenu__item:hover{ background:var(--surface-2); }
.ctai-catmenu__item.is-active{ background:var(--accent-soft); }
.ctai-catmenu__thumb{ width:44px; height:44px; border-radius:8px; overflow:hidden; background:var(--surface-2); flex:none; display:flex; align-items:center; justify-content:center; }
.ctai-catmenu__thumb img{ width:100%; height:100%; object-fit:cover; }
.ctai-catmenu__thumb-empty{ width:100%; height:100%; background:linear-gradient(135deg,var(--surface-2),var(--border)); }
.ctai-catmenu__name{ font-weight:700; font-size:14px; color:var(--text); }

/* upload box */
.ctai-uploadbox{
  border:1.5px dashed var(--border); border-radius:var(--radius-m); padding:26px 14px;
  text-align:center; cursor:pointer; color:var(--text-faint);
}
.ctai-uploadbox:hover{ border-color:var(--accent); color:var(--accent); }
.ctai-uploadbox svg{ margin-bottom:8px; }
.ctai-uploadbox__title{ font-weight:700; color:var(--text); margin:0 0 2px; font-size:14px; }
.ctai-uploadbox__hint{ font-size:11px; margin:0; }

/* generic field */
.ctai-field{ display:flex; flex-direction:column; gap:8px; }
.ctai-field__label{ font-size:11px; font-weight:800; letter-spacing:.06em; text-transform:uppercase; color:var(--text-faint); }
.ctai-field__textarea{
  width:100%; resize:vertical; background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius-m); color:var(--text); font-family:var(--font-body); font-size:14px;
  padding:12px 14px;
}
.ctai-field__textarea:focus{ outline:none; border-color:var(--accent); }
.ctai-field__auto{
  display:inline-flex; align-items:center; justify-content:center; gap:6px; align-self:flex-start;
  background:var(--surface-2); border:1px solid var(--border); color:var(--text-muted);
  font-weight:700; font-size:12.5px; padding:8px 14px; border-radius:999px; cursor:pointer;
}
.ctai-field__auto:hover{ border-color:var(--accent); color:var(--accent); }
.ctai-field__note{ font-size:11.5px; color:var(--text-faint); margin:0; }
.ctai-field__select{
  width:100%; background:var(--surface); border:1px solid var(--border); color:var(--text);
  font-size:13.5px; padding:10px 12px; border-radius:10px; font-family:var(--font-body);
}
.ctai-field2col{ display:grid; grid-template-columns:1fr 1fr; gap:12px; }

/* canvas */
.ctai-studioapp__canvastitle{ font-size:18px; margin-bottom:14px; }
.ctai-canvas{
  position:relative; border:1px solid var(--border); border-radius:var(--radius-l);
  min-height:560px; overflow:hidden; background:var(--surface); display:flex; align-items:center; justify-content:center;
}
.ctai-canvas__bg{
  position:absolute; inset:0; background-size:cover; background-position:center;
  opacity:.16; filter:saturate(0) contrast(1.1);
}
.ctai-canvas.has-upload .ctai-canvas__bg{ opacity:1; filter:none; }
.ctai-canvas.has-upload .ctai-canvas__body{ display:none; }
.ctai-canvas__body{ position:relative; z-index:2; text-align:center; max-width:400px; padding:24px; }
.ctai-canvas__logo{
  font-family:var(--font-display); font-weight:800; font-size:30px; color:var(--text-faint);
  opacity:.4; margin-bottom:26px; letter-spacing:.02em;
}
.ctai-canvas__logo span{ color:var(--accent); opacity:1; }
.ctai-canvas__steps-title{ font-weight:800; color:var(--text); margin-bottom:14px; }
.ctai-canvas__steps{ list-style:none; margin:0 0 22px; padding:0; display:flex; flex-direction:column; gap:10px; text-align:left; }
.ctai-canvas__steps li{
  display:flex; align-items:center; gap:10px; background:var(--surface-2); border:1px solid var(--border);
  border-radius:10px; padding:10px 14px; font-size:13px; color:var(--text-muted);
}
.ctai-canvas__steps li span{
  flex:none; width:20px; height:20px; border-radius:50%; background:var(--accent); color:var(--accent-ink);
  font-size:11px; font-weight:800; display:flex; align-items:center; justify-content:center;
}
.ctai-canvas__hint{ font-size:12px; color:var(--text-faint); margin:14px 0 0; }

/* right panel controls */
.ctai-ratiogrid{ display:grid; grid-template-columns:repeat(4,1fr); gap:8px; }
.ctai-countgrid{ display:grid; grid-template-columns:repeat(4,1fr); gap:8px; }
.ctai-chip{
  background:var(--surface); border:1px solid var(--border); color:var(--text-muted);
  font-weight:700; font-size:12.5px; padding:10px 6px; border-radius:10px; cursor:pointer;
}
.ctai-chip:hover{ border-color:var(--accent); }
.ctai-chip.is-active{ background:var(--accent); border-color:var(--accent); color:var(--accent-ink); }

.ctai-qualitygrid{ display:grid; grid-template-columns:1fr 1fr; gap:8px; }
.ctai-qualitybtn{
  text-align:left; background:var(--surface); border:1px solid var(--border); border-radius:10px;
  padding:10px 12px; cursor:pointer; display:flex; flex-direction:column; gap:4px;
}
.ctai-qualitybtn:hover{ border-color:var(--accent); }
.ctai-qualitybtn.is-active{ border-color:var(--accent); background:var(--accent-soft); }
.ctai-qualitybtn__top{ display:flex; align-items:baseline; justify-content:space-between; gap:6px; }
.ctai-qualitybtn__top strong{ font-size:13.5px; color:var(--text); }
.ctai-qualitybtn__top em{ font-style:normal; font-size:10.5px; font-weight:800; color:var(--accent); }
.ctai-qualitybtn__sub{ font-size:10.5px; color:var(--text-faint); }

.ctai-renderbtn{ width:100%; justify-content:space-between; padding:16px 20px; font-size:15px; }
.ctai-renderbtn span{ background:rgba(0,0,0,.18); padding:3px 10px; border-radius:999px; font-size:12px; }
.ctai-renderbtn.is-loading{ opacity:.75; cursor:progress; }

@media (max-width:1080px){
  .ctai-studioapp__grid{ grid-template-columns:1fr; }
  .ctai-studioapp__side{ position:static; }
  .ctai-studioapp__side--right{ order:3; }
}