/* =========================================================================
   GPTFA AI SaaS — Frontend Design System (v3.2.0)
   Single unified token system for chat, pricing, panel, auth, tools,
   knowledge base, workspace and developer surfaces.
   Mobile-first. Rebuilt from scratch to replace 12 stacked CSS patches.
   ========================================================================= */

/* -------------------------------------------------------------------------
   1. Design tokens
   ------------------------------------------------------------------------- */
.gptfa-chatgpt-shell,
.gptfa-ds-shell,
.gptfa-pricing,
.gptfa-panel,
.gptfa-auth-shell,
.gptfa-guest-wrap,
.gptfa-tools-shell,
.gptfa-developer-shell,
.gptfa-knowledge-page,
.gptfa-workspace {
  /* spacing scale */
  --gptfa-space-1: 4px;
  --gptfa-space-2: 8px;
  --gptfa-space-3: 12px;
  --gptfa-space-4: 16px;
  --gptfa-space-5: 20px;
  --gptfa-space-6: 24px;
  --gptfa-space-7: 32px;
  --gptfa-space-8: 40px;

  /* radius scale */
  --gptfa-radius-sm: 10px;
  --gptfa-radius-md: 14px;
  --gptfa-radius-lg: 18px;
  --gptfa-radius-xl: 22px;
  --gptfa-radius-2xl: 26px;

  /* type scale */
  --gptfa-font: inherit;
  --gptfa-font-size-xs: 12px;
  --gptfa-font-size-sm: 13px;
  --gptfa-font-size-md: 15px;
  --gptfa-font-size-lg: 17px;
  --gptfa-font-size-xl: 22px;
  --gptfa-font-size-2xl: 30px;
  --gptfa-line-tight: 1.4;
  --gptfa-line-normal: 1.75;
  --gptfa-line-loose: 1.95;

  /* control sizing */
  --gptfa-control-h: 44px;
  --gptfa-control-h-lg: 50px;

  /* brand accent (overridable per-instance via inline style --gptfa-accent) */
  --gptfa-accent: #2563eb;
  --gptfa-accent-hover: #1d4ed8;
  --gptfa-accent-soft: rgba(37, 99, 235, .1);
  --gptfa-ring: 0 0 0 4px rgba(37, 99, 235, .15);

  /* light palette (default) */
  --gptfa-page: #f5f6f8;
  --gptfa-bg: #f5f6f8;
  --gptfa-surface: #ffffff;
  --gptfa-surface-2: #f7f8fa;
  --gptfa-elevated: #ffffff;
  --gptfa-text: #0f1728;
  --gptfa-muted: #64748b;
  --gptfa-subtle: #94a3b8;
  --gptfa-border: #e3e7ee;
  --gptfa-border-strong: #cdd5e1;
  --gptfa-danger: #dc2626;
  --gptfa-danger-soft: rgba(220, 38, 38, .08);
  --gptfa-warning: #b45309;
  --gptfa-warning-soft: rgba(180, 83, 9, .1);
  --gptfa-ok: #059669;
  --gptfa-ok-soft: rgba(5, 150, 105, .1);
  --gptfa-info: #0369a1;
  --gptfa-info-soft: rgba(3, 105, 161, .1);
  --gptfa-shadow-xs: 0 1px 2px rgba(16, 24, 40, .05);
  --gptfa-shadow-sm: 0 8px 24px rgba(16, 24, 40, .06);
  --gptfa-shadow-md: 0 20px 56px rgba(16, 24, 40, .1);
  color-scheme: light;
  accent-color: var(--gptfa-accent);
}

.gptfa-chatgpt-shell[data-gptfa-theme="dark"],
.gptfa-chatgpt-shell[data-gptfa-active-theme="dark"],
.gptfa-ds-shell[data-gptfa-theme="dark"] {
  --gptfa-page: #080b11;
  --gptfa-bg: #0a0e16;
  --gptfa-surface: #101626;
  --gptfa-surface-2: #0d1220;
  --gptfa-elevated: #161e30;
  --gptfa-text: #f3f5f9;
  --gptfa-muted: #aab3c5;
  --gptfa-subtle: #7c869b;
  --gptfa-border: #232c40;
  --gptfa-border-strong: #354159;
  --gptfa-danger-soft: rgba(248, 113, 113, .12);
  --gptfa-warning-soft: rgba(251, 191, 36, .12);
  --gptfa-ok-soft: rgba(52, 211, 153, .12);
  --gptfa-info-soft: rgba(56, 189, 248, .12);
  --gptfa-shadow-xs: 0 1px 2px rgba(0, 0, 0, .22);
  --gptfa-shadow-sm: 0 12px 30px rgba(0, 0, 0, .28);
  --gptfa-shadow-md: 0 26px 70px rgba(0, 0, 0, .38);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  .gptfa-chatgpt-shell[data-gptfa-theme="auto"],
  .gptfa-ds-shell[data-gptfa-theme="auto"] {
    --gptfa-page: #080b11;
    --gptfa-bg: #0a0e16;
    --gptfa-surface: #101626;
    --gptfa-surface-2: #0d1220;
    --gptfa-elevated: #161e30;
    --gptfa-text: #f3f5f9;
    --gptfa-muted: #aab3c5;
    --gptfa-subtle: #7c869b;
    --gptfa-border: #232c40;
    --gptfa-border-strong: #354159;
    --gptfa-danger-soft: rgba(248, 113, 113, .12);
    --gptfa-warning-soft: rgba(251, 191, 36, .12);
    --gptfa-ok-soft: rgba(52, 211, 153, .12);
    --gptfa-info-soft: rgba(56, 189, 248, .12);
    --gptfa-shadow-xs: 0 1px 2px rgba(0, 0, 0, .22);
    --gptfa-shadow-sm: 0 12px 30px rgba(0, 0, 0, .28);
    --gptfa-shadow-md: 0 26px 70px rgba(0, 0, 0, .38);
    color-scheme: dark;
  }
}

/* -------------------------------------------------------------------------
   2. Reset & base
   ------------------------------------------------------------------------- */
.gptfa-chatgpt-shell,
.gptfa-ds-shell,
.gptfa-pricing,
.gptfa-panel,
.gptfa-auth-shell,
.gptfa-guest-wrap,
.gptfa-tools-shell,
.gptfa-developer-shell,
.gptfa-knowledge-page,
.gptfa-workspace {
  direction: rtl;
  font-family: var(--gptfa-font);
  color: var(--gptfa-text);
  box-sizing: border-box;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  line-height: var(--gptfa-line-normal);
}
.gptfa-chatgpt-shell *,
.gptfa-ds-shell *,
.gptfa-pricing *,
.gptfa-panel *,
.gptfa-auth-shell *,
.gptfa-guest-wrap *,
.gptfa-tools-shell *,
.gptfa-developer-shell *,
.gptfa-knowledge-page *,
.gptfa-workspace * {
  box-sizing: border-box;
}
.gptfa-chatgpt-shell :where(button, a, input, select, textarea),
.gptfa-ds-shell :where(button, a, input, select, textarea) {
  font: inherit;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease, box-shadow .15s ease, transform .15s ease, opacity .15s ease;
}
.gptfa-chatgpt-shell :where(button, a, input, select, textarea):focus-visible,
.gptfa-ds-shell :where(button, a, input, select, textarea):focus-visible {
  outline: 0;
  box-shadow: var(--gptfa-ring);
  border-color: var(--gptfa-accent) !important;
}
.gptfa-chatgpt-shell ::selection,
.gptfa-ds-shell ::selection {
  background: var(--gptfa-accent-soft);
}
.ltr { direction: ltr; unicode-bidi: isolate; }

/* honeypot field */
.gptfa-hp { position: absolute !important; left: -99999px !important; opacity: 0 !important; pointer-events: none !important; }

/* -------------------------------------------------------------------------
   3. Shared atoms: buttons, inputs, badges, cards, tables, notes
   ------------------------------------------------------------------------- */
.gptfa-button,
.gptfa-link-button,
.gptfa-send-btn,
.gptfa-new-chat,
.gptfa-btn,
.gptfa-btn-primary,
.gptfa-btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--gptfa-space-2);
  border: 1px solid transparent;
  border-radius: var(--gptfa-radius-md);
  min-height: var(--gptfa-control-h);
  padding: 0 var(--gptfa-space-4);
  font-weight: 700;
  line-height: 1.3;
  cursor: pointer;
  text-decoration: none !important;
  white-space: nowrap;
}
.gptfa-button,
.gptfa-send-btn,
.gptfa-new-chat,
.gptfa-btn,
.gptfa-btn-primary {
  background: var(--gptfa-accent);
  color: #fff !important;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
}
.gptfa-button:hover,
.gptfa-send-btn:hover:not(:disabled),
.gptfa-new-chat:hover,
.gptfa-btn:hover,
.gptfa-btn-primary:hover {
  background: var(--gptfa-accent-hover);
}
.gptfa-send-btn:disabled { opacity: .55; cursor: wait; }
.gptfa-stop-btn,
.gptfa-link-button.danger {
  background: var(--gptfa-danger-soft);
  color: var(--gptfa-danger) !important;
  border-color: rgba(220, 38, 38, .2);
}
.gptfa-stop-btn:hover,
.gptfa-link-button.danger:hover { background: rgba(220, 38, 38, .15); }
.gptfa-link-button,
.gptfa-button.muted,
.gptfa-btn-ghost {
  background: var(--gptfa-surface-2);
  color: var(--gptfa-text) !important;
  border-color: var(--gptfa-border);
}
.gptfa-link-button:hover,
.gptfa-button.muted:hover,
.gptfa-btn-ghost:hover {
  background: var(--gptfa-surface);
  border-color: var(--gptfa-accent);
}
.gptfa-link-button.primary {
  background: var(--gptfa-accent-soft);
  color: var(--gptfa-accent) !important;
  border-color: transparent;
}
.gptfa-link-button.primary:hover { background: var(--gptfa-accent); color: #fff !important; }
.gptfa-icon-btn {
  height: var(--gptfa-control-h);
  min-width: var(--gptfa-control-h);
  border: 1px solid var(--gptfa-border);
  border-radius: var(--gptfa-radius-md);
  background: var(--gptfa-surface-2);
  color: var(--gptfa-text);
  cursor: pointer;
  font-weight: 700;
  display: inline-grid;
  place-items: center;
}
.gptfa-icon-btn:hover { border-color: var(--gptfa-border-strong); background: var(--gptfa-elevated); }

.gptfa-chatgpt-shell input:not([type=checkbox]):not([type=radio]):not([type=range]),
.gptfa-chatgpt-shell select,
.gptfa-chatgpt-shell textarea,
.gptfa-ds-shell input:not([type=checkbox]):not([type=radio]):not([type=range]),
.gptfa-ds-shell select,
.gptfa-ds-shell textarea {
  width: 100%;
  min-height: var(--gptfa-control-h);
  border: 1px solid var(--gptfa-border);
  background: var(--gptfa-surface-2);
  color: var(--gptfa-text);
  border-radius: var(--gptfa-radius-md);
  padding: 0 var(--gptfa-space-3);
  outline: 0;
}
.gptfa-chatgpt-shell textarea,
.gptfa-ds-shell textarea { padding: var(--gptfa-space-3); resize: vertical; }
.gptfa-chatgpt-shell input:focus,
.gptfa-chatgpt-shell select:focus,
.gptfa-chatgpt-shell textarea:focus,
.gptfa-ds-shell input:focus,
.gptfa-ds-shell select:focus,
.gptfa-ds-shell textarea:focus {
  border-color: var(--gptfa-accent);
  box-shadow: var(--gptfa-ring);
}
.gptfa-ds-shell label { display: grid; gap: var(--gptfa-space-2); font-size: var(--gptfa-font-size-sm); font-weight: 700; color: var(--gptfa-muted); }

.gptfa-card,
.gptfa-panel-card,
.gptfa-auth-card,
.gptfa-plan,
.gptfa-price-card,
.gptfa-extra-item,
.gptfa-extra-box,
.gptfa-stat,
.gptfa-guest-wrap {
  background: var(--gptfa-surface);
  border: 1px solid var(--gptfa-border);
  border-radius: var(--gptfa-radius-xl);
  padding: var(--gptfa-space-6);
  box-shadow: var(--gptfa-shadow-sm);
}
.gptfa-card-head { display: flex; align-items: center; justify-content: space-between; gap: var(--gptfa-space-3); margin-bottom: var(--gptfa-space-4); }

.gptfa-badge,
.gptfa-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--gptfa-space-2);
  min-height: 30px;
  padding: 4px var(--gptfa-space-3);
  border: 1px solid var(--gptfa-border);
  background: var(--gptfa-surface-2);
  color: var(--gptfa-muted);
  border-radius: 999px;
  font-size: var(--gptfa-font-size-xs);
  font-weight: 700;
}
.gptfa-status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 26px;
  padding: 3px var(--gptfa-space-3);
  border-radius: 999px;
  border: 1px solid var(--gptfa-border);
  background: var(--gptfa-surface-2);
  color: var(--gptfa-muted);
  font-size: var(--gptfa-font-size-xs);
  font-weight: 700;
  white-space: nowrap;
}
.gptfa-status-pill.status-paid,
.gptfa-status-pill.status-applied { color: var(--gptfa-ok); background: var(--gptfa-ok-soft); border-color: transparent; }
.gptfa-status-pill.status-pending,
.gptfa-status-pill.status-pending_retry,
.gptfa-status-pill.status-verifying { color: var(--gptfa-warning); background: var(--gptfa-warning-soft); border-color: transparent; }
.gptfa-status-pill.status-cancelled,
.gptfa-status-pill.status-failed,
.gptfa-status-pill.status-expired { color: var(--gptfa-danger); background: var(--gptfa-danger-soft); border-color: transparent; }

.gptfa-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.gptfa-table {
  width: 100%;
  min-width: 480px;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--gptfa-surface);
  border: 1px solid var(--gptfa-border);
  border-radius: var(--gptfa-radius-lg);
  overflow: hidden;
}
.gptfa-table th,
.gptfa-table td { padding: var(--gptfa-space-3) var(--gptfa-space-4); border-bottom: 1px solid var(--gptfa-border); text-align: right; }
.gptfa-table th { color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); font-weight: 700; background: var(--gptfa-surface-2); }
.gptfa-table tbody tr:last-child td { border-bottom: 0; }

.gptfa-note,
.gptfa-empty-state {
  border: 1px dashed var(--gptfa-border);
  border-radius: var(--gptfa-radius-lg);
  padding: var(--gptfa-space-4) var(--gptfa-space-5);
  color: var(--gptfa-muted);
  line-height: var(--gptfa-line-normal);
}
.gptfa-empty-state { text-align: center; display: grid; gap: var(--gptfa-space-2); justify-items: center; }
.gptfa-empty-state h3 { margin: 0; color: var(--gptfa-text); font-size: var(--gptfa-font-size-lg); }
.gptfa-empty-state p { margin: 0; }

.gptfa-alert {
  border: 1px solid var(--gptfa-border);
  border-radius: var(--gptfa-radius-lg);
  padding: var(--gptfa-space-4) var(--gptfa-space-5);
  margin-bottom: var(--gptfa-space-4);
  display: grid;
  gap: var(--gptfa-space-2);
}
.gptfa-alert.success { border-color: rgba(5, 150, 105, .3); background: var(--gptfa-ok-soft); }
.gptfa-alert code { display: inline-block; word-break: break-all; background: var(--gptfa-surface); border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-sm); padding: var(--gptfa-space-2) var(--gptfa-space-3); }

.gptfa-grid,
.gptfa-panel-grid { display: grid; gap: var(--gptfa-space-4); }
.gptfa-grid.two,
.gptfa-panel-grid.two { grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); }
.gptfa-form-grid { display: grid; gap: var(--gptfa-space-3); }
.gptfa-form-row { display: grid; gap: var(--gptfa-space-3); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gptfa-checkbox-grid { display: grid; gap: var(--gptfa-space-2); grid-template-columns: repeat(2, minmax(0, 1fr)); margin: var(--gptfa-space-2) 0; }
.gptfa-checkbox-grid label { flex-direction: row; align-items: center; display: flex; gap: var(--gptfa-space-2); font-weight: 600; }
.gptfa-inline-code { direction: ltr; display: inline-block; background: var(--gptfa-surface-2); border: 1px solid var(--gptfa-border); border-radius: 7px; padding: 0 6px; }
.gptfa-rich-text { line-height: var(--gptfa-line-loose); }
.gptfa-rich-text p { margin: 0 0 var(--gptfa-space-3); }

/* =========================================================================
   4. Chat shell (ChatGPT-style layout: sidebar + main)
   ========================================================================= */
.gptfa-chatgpt-shell {
  width: 100%;
  max-width: 1220px;
  margin: var(--gptfa-space-5) auto;
  padding: 0 var(--gptfa-space-3);
}
.gptfa-chatgpt-shell.layout-contained { max-width: 1040px; }
.gptfa-chatgpt-shell.layout-wide { max-width: 1320px; }
.gptfa-chatgpt-shell.layout-full { max-width: none; margin: 0; padding: 0; }

.gptfa-chatgpt-card {
  height: min(var(--gptfa-chat-height, 780px), calc(100svh - 40px));
  min-height: 560px;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  background: var(--gptfa-bg);
  border: 1px solid var(--gptfa-border);
  border-radius: var(--gptfa-radius-2xl);
  box-shadow: var(--gptfa-shadow-md);
  overflow: hidden;
  position: relative;
  isolation: isolate;
}
.gptfa-chatgpt-shell.layout-full .gptfa-chatgpt-card { border-radius: 0; border-inline: 0; }
.gptfa-chatgpt-card.no-sidebar { grid-template-columns: 1fr; }
.gptfa-chatgpt-card.no-sidebar .gptfa-chat-sidebar { display: none; }
.gptfa-chatgpt-card.density-compact { --gptfa-pad: 12px; --gptfa-gap: 8px; --gptfa-bubble-pad: 11px 13px; }
.gptfa-chatgpt-card.density-comfortable { --gptfa-pad: 18px; --gptfa-gap: 14px; --gptfa-bubble-pad: 14px 16px; }
.gptfa-chatgpt-card.density-spacious { --gptfa-pad: 24px; --gptfa-gap: 18px; --gptfa-bubble-pad: 17px 20px; }

/* ---- Sidebar ---- */
.gptfa-chat-sidebar {
  --gptfa-pad: 18px;
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
  gap: var(--gptfa-space-4);
  padding: var(--gptfa-pad);
  background: var(--gptfa-surface);
  border-inline-end: 1px solid var(--gptfa-border);
  overflow: hidden;
  transition: transform .2s ease, width .2s ease, padding .2s ease;
}
.gptfa-chatgpt-card.sidebar-collapsed { grid-template-columns: 0 minmax(0, 1fr); }
.gptfa-chatgpt-card.sidebar-collapsed .gptfa-chat-sidebar { transform: translateX(110%); width: 0; padding: 0; border: 0; }
.gptfa-sidebar-brand { display: flex; align-items: center; gap: var(--gptfa-space-3); min-width: 0; }
.gptfa-brand-mark,
.gptfa-welcome-mark,
.gptfa-avatar {
  display: grid;
  place-items: center;
  background: var(--gptfa-surface-2);
  border: 1px solid var(--gptfa-border);
  color: var(--gptfa-text);
  font-weight: 900;
}
.gptfa-brand-mark { width: 42px; height: 42px; min-width: 42px; border-radius: var(--gptfa-radius-md); }
.gptfa-brand-mark.large,
.gptfa-brand-logo.large { width: 72px; height: 72px; border-radius: var(--gptfa-radius-xl); margin: 0 auto var(--gptfa-space-2); padding: 10px; }
.gptfa-brand-logo {
  width: 42px; height: 42px; min-width: 42px; border-radius: var(--gptfa-radius-md);
  background: var(--gptfa-surface-2); border: 1px solid var(--gptfa-border);
  display: grid; place-items: center; padding: 6px; overflow: hidden;
}
.gptfa-brand-logo img, .gptfa-welcome-logo img { display: block; max-width: 100%; max-height: 100%; object-fit: contain; }
.gptfa-sidebar-brand strong { display: block; font-size: var(--gptfa-font-size-sm); line-height: var(--gptfa-line-tight); }
.gptfa-sidebar-brand span { display: block; color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); }

.gptfa-search-wrap { display: grid; gap: var(--gptfa-space-2); color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); font-weight: 700; }
.gptfa-sidebar-section-label { color: var(--gptfa-subtle); font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .03em; }

.gptfa-conversation-list { min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding-inline-end: 2px; scrollbar-width: thin; scrollbar-color: var(--gptfa-border-strong) transparent; }
.gptfa-conversation-item { display: grid; grid-template-columns: minmax(0, 1fr) 32px; align-items: center; gap: 6px; margin-bottom: 6px; border-radius: var(--gptfa-radius-md); }
.gptfa-conversation-item > button { border: 0; background: transparent; color: inherit; cursor: pointer; }
.gptfa-conversation-item > button:first-child { min-width: 0; text-align: right; padding: var(--gptfa-space-2) 11px; border-radius: var(--gptfa-radius-md); display: grid; gap: 2px; }
.gptfa-conversation-item:hover, .gptfa-conversation-item.active { background: var(--gptfa-surface-2); }
.gptfa-conversation-item.active { box-shadow: inset 3px 0 0 var(--gptfa-accent); }
.gptfa-conversation-item span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: var(--gptfa-font-size-sm); font-weight: 700; }
.gptfa-conversation-item small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--gptfa-muted); font-size: 11px; }
.gptfa-conv-delete { height: 32px; width: 32px; border-radius: var(--gptfa-radius-sm); color: var(--gptfa-muted) !important; }
.gptfa-conv-delete:hover { background: var(--gptfa-danger-soft) !important; color: var(--gptfa-danger) !important; }
.gptfa-empty-list { border: 1px dashed var(--gptfa-border); border-radius: var(--gptfa-radius-md); padding: var(--gptfa-space-4); color: var(--gptfa-muted); font-size: var(--gptfa-font-size-sm); text-align: center; }

.gptfa-sidebar-foot { display: grid; gap: 4px; border-top: 1px solid var(--gptfa-border); padding-top: var(--gptfa-space-3); }
.gptfa-sidebar-foot a { color: var(--gptfa-muted) !important; text-decoration: none !important; font-size: var(--gptfa-font-size-sm); font-weight: 700; padding: 9px 10px; border-radius: var(--gptfa-radius-sm); }
.gptfa-sidebar-foot a:hover { background: var(--gptfa-surface-2); color: var(--gptfa-text) !important; }
.gptfa-sidebar-workspace-switch,
.gptfa-chat-workspace-switch { display: grid; gap: var(--gptfa-space-2); }

/* ---- Main column ---- */
.gptfa-chat-main { min-width: 0; min-height: 0; display: grid; grid-template-rows: auto auto minmax(0, 1fr) auto auto; background: var(--gptfa-bg); overflow: hidden; }
.gptfa-chat-topbar {
  min-height: 68px;
  padding: var(--gptfa-space-3) var(--gptfa-space-5);
  display: flex;
  align-items: center;
  gap: var(--gptfa-space-3);
  background: var(--gptfa-surface);
  border-bottom: 1px solid var(--gptfa-border);
}
.gptfa-chat-title { min-width: 0; display: grid; gap: 2px; margin-inline-end: auto; }
.gptfa-chat-title strong { font-size: var(--gptfa-font-size-md); line-height: var(--gptfa-line-tight); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gptfa-chat-title span { font-size: var(--gptfa-font-size-xs); color: var(--gptfa-muted); }
.gptfa-chat-controls { display: flex; align-items: center; gap: var(--gptfa-space-2); flex-wrap: wrap; }
.gptfa-chat-controls select { width: auto; max-width: 200px; }
.gptfa-quota-line { height: 4px; background: var(--gptfa-border); overflow: hidden; }
.gptfa-quota-line span { display: block; height: 100%; background: var(--gptfa-accent); transition: width .25s ease; border-radius: 0 999px 999px 0; }

.gptfa-chat-workspace { position: relative; min-height: 0; overflow: hidden; display: grid; grid-template-rows: minmax(0, 1fr); background: var(--gptfa-bg); }
.gptfa-welcome { position: absolute; inset: 0; z-index: 1; display: grid; align-content: center; justify-items: center; gap: var(--gptfa-space-4); padding: var(--gptfa-space-6); overflow-y: auto; text-align: center; background: var(--gptfa-bg); }
.gptfa-welcome[hidden] { display: none; }
.gptfa-welcome-mark { width: 64px; height: 64px; border-radius: var(--gptfa-radius-xl); font-size: var(--gptfa-font-size-sm); }
.gptfa-welcome-logo { width: 80px; height: 80px; border-radius: var(--gptfa-radius-xl); background: var(--gptfa-surface); border: 1px solid var(--gptfa-border); box-shadow: var(--gptfa-shadow-sm); display: grid; place-items: center; padding: 14px; }
.gptfa-welcome h2 { margin: 0; max-width: 720px; font-size: clamp(20px, 4vw, 27px); font-weight: 800; line-height: 1.6; letter-spacing: -.01em; }
.gptfa-welcome p { margin: 0; max-width: 620px; color: var(--gptfa-muted); }
.gptfa-starters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gptfa-space-3); width: min(720px, 100%); }
.gptfa-starters button { text-align: right; border: 1px solid var(--gptfa-border); background: var(--gptfa-surface); color: var(--gptfa-text); padding: var(--gptfa-space-4); border-radius: var(--gptfa-radius-lg); cursor: pointer; line-height: var(--gptfa-line-normal); font-weight: 700; box-shadow: var(--gptfa-shadow-xs); }
.gptfa-starters button:hover { border-color: var(--gptfa-accent); box-shadow: var(--gptfa-ring); }

.gptfa-chatgpt-shell .gptfa-messages {
  min-height: 0; height: 100%; overflow-y: auto; overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: var(--gptfa-pad, 18px) clamp(14px, 4vw, 52px);
  scrollbar-width: thin; scrollbar-color: var(--gptfa-border-strong) transparent;
  scroll-padding-bottom: 130px;
}
.gptfa-message-pro { display: grid; grid-template-columns: 38px minmax(0, 1fr); gap: var(--gptfa-space-3); margin: 0 auto var(--gptfa-space-5); max-width: 900px; align-items: start; }
.gptfa-message-pro.user { grid-template-columns: minmax(0, 1fr) 38px; }
.gptfa-message-pro.user .gptfa-avatar { grid-column: 2; }
.gptfa-message-pro.user .gptfa-message-body { grid-column: 1; grid-row: 1; justify-self: end; }
.gptfa-avatar { width: 38px; height: 38px; border-radius: var(--gptfa-radius-md); font-size: 11px; overflow: hidden; }
.gptfa-avatar img { width: 100%; height: 100%; object-fit: contain; padding: 6px; }
.gptfa-message-body { min-width: 0; display: grid; gap: 6px; max-width: 100%; }
.gptfa-bubble {
  max-width: min(720px, 100%);
  background: var(--gptfa-surface);
  border: 1px solid var(--gptfa-border);
  border-radius: var(--gptfa-radius-xl);
  padding: var(--gptfa-bubble-pad, 14px 16px);
  line-height: var(--gptfa-line-loose);
  box-shadow: var(--gptfa-shadow-xs);
  overflow-wrap: anywhere;
}
.gptfa-message-pro.assistant .gptfa-bubble { border-start-start-radius: 6px; }
.gptfa-message-pro.user .gptfa-bubble { background: var(--gptfa-accent); border-color: var(--gptfa-accent); color: #fff; border-start-end-radius: 6px; }
.gptfa-message-tools { display: flex; gap: var(--gptfa-space-2); flex-wrap: wrap; }
.gptfa-message-tools button { border: 0; background: transparent; color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); font-weight: 700; cursor: pointer; padding: 2px 0; }
.gptfa-message-tools button:hover { color: var(--gptfa-text); }
.gptfa-usage-meta { color: var(--gptfa-muted); font-size: 11px; }
.gptfa-bubble p { margin: 0 0 var(--gptfa-space-2); }
.gptfa-bubble p:last-child { margin-bottom: 0; }
.gptfa-citations { margin-top: var(--gptfa-space-2); font-size: var(--gptfa-font-size-xs); color: var(--gptfa-muted); }

.gptfa-codeblock, .gptfa-code-block { border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-lg); overflow: hidden; background: var(--gptfa-surface-2); margin: var(--gptfa-space-3) 0; }
.gptfa-code-head { display: flex; justify-content: space-between; align-items: center; gap: var(--gptfa-space-2); padding: var(--gptfa-space-2) var(--gptfa-space-3); border-bottom: 1px solid var(--gptfa-border); color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); }
.gptfa-code-head button { border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-sm); background: var(--gptfa-surface); color: var(--gptfa-text); cursor: pointer; padding: 4px 9px; font-size: var(--gptfa-font-size-xs); }
.gptfa-codeblock pre, .gptfa-code-block pre { margin: 0; padding: var(--gptfa-space-4); overflow: auto; line-height: var(--gptfa-line-normal); direction: ltr; text-align: left; }

.gptfa-dot { display: inline-block; width: 7px; height: 7px; margin: 0 3px; border-radius: 999px; background: var(--gptfa-accent); animation: gptfaPulse 1s infinite ease-in-out; }
.gptfa-dot:nth-child(2) { animation-delay: .14s; }
.gptfa-dot:nth-child(3) { animation-delay: .28s; }
@keyframes gptfaPulse { 0%, 80%, 100% { opacity: .25; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-5px); } }
@media (prefers-reduced-motion: reduce) { .gptfa-dot { animation: none; opacity: .7; } }

.gptfa-advanced-row { display: flex; align-items: center; gap: var(--gptfa-space-4); flex-wrap: wrap; padding: var(--gptfa-space-3) var(--gptfa-space-5); border-top: 1px solid var(--gptfa-border); background: var(--gptfa-surface); font-size: var(--gptfa-font-size-xs); color: var(--gptfa-muted); }
.gptfa-advanced-row:empty { display: none; }
.gptfa-advanced-row label { display: inline-flex; align-items: center; gap: var(--gptfa-space-2); }
.gptfa-advanced-row input[type=range] { accent-color: var(--gptfa-accent); width: auto; min-height: auto; }
.gptfa-advanced-row input[type=number] { width: 92px; min-height: 36px; padding: 0 var(--gptfa-space-2); }

.gptfa-composer-pro { padding: var(--gptfa-space-4) var(--gptfa-space-5); border-top: 1px solid var(--gptfa-border); background: var(--gptfa-surface); }
.gptfa-composer-inner {
  max-width: 900px; margin: 0 auto;
  display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: var(--gptfa-space-2);
  padding: var(--gptfa-space-2); border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-xl);
  background: var(--gptfa-surface-2);
}
.gptfa-composer-inner:focus-within { border-color: var(--gptfa-accent); box-shadow: var(--gptfa-ring); }
.gptfa-composer-inner textarea { min-height: 44px; max-height: 240px; min-width: 0; border: 0; outline: 0; resize: none; background: transparent; line-height: var(--gptfa-line-loose); padding: var(--gptfa-space-2) var(--gptfa-space-2); }
.gptfa-composer-actions { display: flex; align-items: center; gap: var(--gptfa-space-2); }
.gptfa-composer-actions span { font-size: 11px; color: var(--gptfa-muted); min-width: 28px; text-align: center; }
.gptfa-send-btn, .gptfa-stop-btn { height: 42px; min-width: 72px; border-radius: var(--gptfa-radius-md); padding: 0 var(--gptfa-space-4); font-weight: 800; }
.gptfa-composer-foot { max-width: 900px; margin: var(--gptfa-space-2) auto 0; display: flex; align-items: center; gap: var(--gptfa-space-3); flex-wrap: wrap; color: var(--gptfa-muted); font-size: 11px; }
.gptfa-composer-foot button { border: 0; background: transparent; color: var(--gptfa-muted); cursor: pointer; font-size: var(--gptfa-font-size-xs); font-weight: 700; padding: 4px 0; }
.gptfa-composer-foot button:hover { color: var(--gptfa-text); }

.gptfa-chatgpt-shell .gptfa-cta { max-width: 900px; margin: 0 auto; padding: var(--gptfa-space-3) var(--gptfa-space-4); border-top: 1px solid var(--gptfa-border); background: var(--gptfa-surface); color: var(--gptfa-warning); display: flex; align-items: center; gap: var(--gptfa-space-3); flex-wrap: wrap; font-size: var(--gptfa-font-size-sm); }
.gptfa-chatgpt-shell .gptfa-cta[hidden] { display: none; }
.gptfa-chatgpt-shell .gptfa-cta a { color: var(--gptfa-accent) !important; text-decoration: none !important; border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-sm); padding: 6px var(--gptfa-space-3); font-weight: 700; background: var(--gptfa-surface-2); }
.gptfa-chatgpt-shell .gptfa-cta.needs-register [data-gptfa-upgrade-link] { display: none; }
.gptfa-chatgpt-shell .gptfa-cta.needs-upgrade [data-gptfa-login-link] { display: none; }
.gptfa-guest-banner { display: flex; align-items: center; gap: var(--gptfa-space-3); flex-wrap: wrap; padding: var(--gptfa-space-3) var(--gptfa-space-4); margin-bottom: var(--gptfa-space-3); border-radius: var(--gptfa-radius-lg); background: var(--gptfa-accent-soft); color: var(--gptfa-text); border: 1px solid transparent; font-size: var(--gptfa-font-size-sm); }

/* =========================================================================
   5. Shared page shell (pricing / panel / auth / tools / kb / developer)
   ========================================================================= */
.gptfa-pricing,
.gptfa-panel,
.gptfa-auth-shell,
.gptfa-guest-wrap,
.gptfa-tools-shell,
.gptfa-developer-shell,
.gptfa-knowledge-page,
.gptfa-workspace {
  width: 100%;
  max-width: 1180px;
  margin: var(--gptfa-space-6) auto;
  padding: 0 var(--gptfa-space-4);
}
.gptfa-pricing.layout-full, .gptfa-panel.layout-full { max-width: none; }
.gptfa-panel { display: grid; gap: var(--gptfa-space-6); }

.gptfa-section-head { display: grid; justify-items: center; gap: var(--gptfa-space-2); margin: 0 auto var(--gptfa-space-6); text-align: center; max-width: 760px; }
.gptfa-section-head.align-right { justify-items: start; text-align: right; margin-inline-start: 0; }
.gptfa-section-head h2 { margin: 0; font-size: clamp(22px, 4vw, 32px); font-weight: 800; line-height: 1.4; letter-spacing: -.015em; }
.gptfa-section-head p, .gptfa-note { margin: 0; color: var(--gptfa-muted); }

/* ---- Pricing ---- */
.gptfa-pricing-grid, .gptfa-extra-grid, .gptfa-stats-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gptfa-space-4); }
.gptfa-plan, .gptfa-price-card { display: flex; flex-direction: column; gap: var(--gptfa-space-4); position: relative; isolation: isolate; }
.gptfa-plan.featured, .gptfa-price-card.featured, .gptfa-panel-card.featured { border-color: var(--gptfa-accent); box-shadow: 0 0 0 1px var(--gptfa-accent), var(--gptfa-shadow-sm); }
.gptfa-price-card .gptfa-badge { align-self: flex-start; }
.gptfa-plan h3, .gptfa-price-card h3, .gptfa-panel-card h3, .gptfa-auth-card h2 { margin: 0; font-weight: 800; line-height: 1.5; }
.gptfa-price { display: flex; align-items: baseline; gap: 6px; flex-wrap: wrap; margin: 0; font-size: clamp(26px, 3vw, 32px); font-weight: 900; letter-spacing: -.02em; }
.gptfa-price small { font-size: var(--gptfa-font-size-md); font-weight: 700; color: var(--gptfa-muted); }
.gptfa-plan ul, .gptfa-price-card ul, .gptfa-feature-list { padding: 0; margin: 4px 0; list-style: none; display: grid; gap: var(--gptfa-space-3); }
.gptfa-plan li, .gptfa-price-card li, .gptfa-feature-list li { display: grid; grid-template-columns: 20px minmax(0, 1fr); align-items: start; gap: var(--gptfa-space-2); color: var(--gptfa-muted); line-height: var(--gptfa-line-normal); font-size: var(--gptfa-font-size-md); }
.gptfa-plan li::before, .gptfa-price-card li::before, .gptfa-feature-list li::before {
  content: "✓"; display: grid; place-items: center; width: 20px; height: 20px; margin-top: 2px;
  border-radius: 999px; background: var(--gptfa-accent-soft); color: var(--gptfa-accent); font-size: 12px; font-weight: 900;
}
.gptfa-token-line { display: inline-flex; align-items: center; width: max-content; max-width: 100%; background: var(--gptfa-surface-2); border: 1px solid var(--gptfa-border); border-radius: 999px; padding: 6px 11px; color: var(--gptfa-muted); font-size: var(--gptfa-font-size-sm); font-weight: 700; }
.gptfa-pay-actions, .gptfa-panel-actions { display: flex; gap: var(--gptfa-space-2); flex-wrap: wrap; margin-top: auto; padding-top: var(--gptfa-space-2); }
.gptfa-panel-actions.compact { margin: 0; padding: 0; flex: 0 0 auto; }
.gptfa-panel-actions.inline { margin-top: var(--gptfa-space-3); display: flex; align-items: center; gap: var(--gptfa-space-2); flex-wrap: wrap; padding: 0; }
.gptfa-panel-actions.inline.security { border-top: 1px solid var(--gptfa-border); padding-top: var(--gptfa-space-4); margin-top: var(--gptfa-space-4); }
.gptfa-panel-actions.inline form { margin: 0; }

.gptfa-extra-box { margin-top: var(--gptfa-space-6); }
.gptfa-extra-box h3 { margin: 0 0 var(--gptfa-space-4); font-size: var(--gptfa-font-size-lg); }
.gptfa-extra-item { display: grid; gap: var(--gptfa-space-2); text-decoration: none !important; color: var(--gptfa-text) !important; }
.gptfa-extra-item:hover { border-color: var(--gptfa-accent); transform: translateY(-1px); box-shadow: var(--gptfa-shadow-md); }
.gptfa-extra-item strong { font-size: var(--gptfa-font-size-md); }
.gptfa-extra-item span { color: var(--gptfa-muted); font-size: var(--gptfa-font-size-sm); }

/* ---- Account / panel ---- */
.gptfa-stat { display: grid; gap: 4px; }
.gptfa-stat strong { font-size: clamp(20px, 2.4vw, 26px); letter-spacing: -.01em; }
.gptfa-stat span { color: var(--gptfa-muted); font-size: var(--gptfa-font-size-sm); }
.gptfa-account-stats .gptfa-stat span em { display: block; margin-top: 4px; font-style: normal; color: var(--gptfa-warning); font-size: var(--gptfa-font-size-xs); }
.gptfa-account-overview { display: grid; gap: var(--gptfa-space-5); }
.gptfa-account-overview-head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--gptfa-space-4); flex-wrap: wrap; }
.gptfa-account-overview-head h3 { margin: 0 !important; }
.gptfa-account-overview-head p { margin: 4px 0 0; color: var(--gptfa-muted); font-size: var(--gptfa-font-size-sm); }
.gptfa-account-meta-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gptfa-space-3); }
.gptfa-account-meta-item { border: 1px solid var(--gptfa-border); background: var(--gptfa-surface-2); border-radius: var(--gptfa-radius-lg); padding: var(--gptfa-space-4); display: grid; gap: 5px; min-width: 0; }
.gptfa-account-meta-item span { color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); font-weight: 700; }
.gptfa-account-meta-item strong { font-size: var(--gptfa-font-size-md); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gptfa-account-meta-item small { font-size: var(--gptfa-font-size-xs); color: var(--gptfa-muted); }
.gptfa-account-meta-item small.warning { color: var(--gptfa-warning); font-weight: 800; }
.gptfa-usage-progress-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gptfa-space-3); }
.gptfa-usage-progress-card { display: grid; gap: var(--gptfa-space-2); border: 1px solid var(--gptfa-border); background: var(--gptfa-surface); border-radius: var(--gptfa-radius-lg); padding: var(--gptfa-space-4); }
.gptfa-usage-progress-card > div:first-child { display: flex; justify-content: space-between; align-items: center; gap: var(--gptfa-space-3); }
.gptfa-usage-progress-card span, .gptfa-usage-progress-card small { color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); }
.gptfa-progress { height: 8px; border-radius: 999px; background: var(--gptfa-border); overflow: hidden; }
.gptfa-progress span { display: block; height: 100%; border-radius: 999px; background: var(--gptfa-accent); }
.gptfa-account-form { display: grid; gap: var(--gptfa-space-3); }
.gptfa-account-form input { width: 100%; }
.gptfa-panel-notice { margin: 0; }

/* ---- Auth ---- */
.gptfa-auth-shell { display: grid; place-items: center; min-height: 480px; }
.gptfa-auth-card { width: min(460px, 100%); display: grid; gap: var(--gptfa-space-4); text-align: center; }
.gptfa-auth-card h2 { text-align: center; }
.gptfa-auth-card form,
.gptfa-register-form, .gptfa-password-login, .gptfa-otp-request, .gptfa-otp-verify { display: grid; gap: var(--gptfa-space-3); text-align: right; }
.gptfa-otp-box { border: 1px solid var(--gptfa-border); background: var(--gptfa-surface-2); border-radius: var(--gptfa-radius-xl); padding: var(--gptfa-space-4); display: grid; gap: var(--gptfa-space-3); text-align: right; }
.gptfa-otp-box h3 { margin: 0; font-size: var(--gptfa-font-size-md); }
.gptfa-otp-channels { display: flex; gap: var(--gptfa-space-3); flex-wrap: wrap; color: var(--gptfa-muted); font-size: var(--gptfa-font-size-sm); }
.gptfa-otp-status { font-size: var(--gptfa-font-size-sm); color: var(--gptfa-muted); }
.gptfa-otp-status.is-error { color: var(--gptfa-danger); }
.gptfa-password-login, .gptfa-register-details { border-top: 1px solid var(--gptfa-border); padding-top: var(--gptfa-space-4); margin-top: 2px; text-align: right; }
.gptfa-password-login summary, .gptfa-register-details summary { cursor: pointer; font-weight: 700; color: var(--gptfa-muted); list-style: none; }
.gptfa-password-login summary::-webkit-details-marker, .gptfa-register-details summary::-webkit-details-marker { display: none; }
.gptfa-password-login[open] summary, .gptfa-register-details[open] summary { color: var(--gptfa-text); margin-bottom: var(--gptfa-space-3); }
.gptfa-auth-card .login-username, .gptfa-auth-card .login-password,
.gptfa-auth-card .login-remember, .gptfa-auth-card .login-submit { display: grid; gap: 6px; margin: 0 0 var(--gptfa-space-2); }
.gptfa-auth-card .login-remember { display: flex; flex-direction: row; align-items: center; gap: var(--gptfa-space-2); font-size: var(--gptfa-font-size-sm); }
.gptfa-auth-card .login-submit input[type=submit] {
  display: inline-flex; align-items: center; justify-content: center; width: 100%;
  min-height: var(--gptfa-control-h); border-radius: var(--gptfa-radius-md); border: 0;
  background: var(--gptfa-accent); color: #fff; font-weight: 700; cursor: pointer;
}
.gptfa-auth-card .login-submit input[type=submit]:hover { background: var(--gptfa-accent-hover); }

/* ---- Captcha ---- */
.gptfa-captcha { display: grid; gap: var(--gptfa-space-2); margin: var(--gptfa-space-2) 0 var(--gptfa-space-3); padding: var(--gptfa-space-3); border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-lg); background: var(--gptfa-surface-2); }
.gptfa-captcha > label { font-size: var(--gptfa-font-size-xs); font-weight: 700; color: var(--gptfa-muted); }
.gptfa-captcha-row { display: grid; grid-template-columns: auto minmax(74px, 120px) 40px; gap: var(--gptfa-space-2); align-items: center; }
.gptfa-captcha-row img { display: block; width: 190px; max-width: 100%; height: 56px; border-radius: var(--gptfa-radius-md); border: 1px solid var(--gptfa-border); background: #fff; }
.gptfa-captcha-row input[type="text"] { min-height: 42px; text-align: center; direction: ltr; font-weight: 700; }
.gptfa-captcha-refresh { width: 40px; height: 40px; border-radius: var(--gptfa-radius-md); border: 1px solid var(--gptfa-border); background: var(--gptfa-surface); cursor: pointer; font-size: 17px; font-weight: 800; color: var(--gptfa-text); }
.gptfa-captcha small { font-size: 11px; color: var(--gptfa-muted); }
.gptfa-captcha .cf-turnstile { min-height: 65px; }

/* ---- Tools workbench ---- */
.gptfa-tools-shell { display: grid; gap: var(--gptfa-space-5); max-width: 1280px; }
.gptfa-tools-hero { display: grid; gap: var(--gptfa-space-4); padding: var(--gptfa-space-5); background: var(--gptfa-surface); border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-xl); box-shadow: var(--gptfa-shadow-sm); }
.gptfa-tools-brand { display: flex; align-items: center; gap: var(--gptfa-space-3); }
.gptfa-tools-brand strong { display: block; font-size: var(--gptfa-font-size-sm); }
.gptfa-tools-brand span { display: block; color: var(--gptfa-muted); font-size: var(--gptfa-font-size-xs); }
.gptfa-tools-title span { color: var(--gptfa-accent); font-size: var(--gptfa-font-size-xs); font-weight: 800; }
.gptfa-tools-title h2 { margin: 4px 0; font-size: clamp(20px, 3vw, 26px); }
.gptfa-tools-title p { margin: 0; color: var(--gptfa-muted); }
.gptfa-tools-hero-actions { display: flex; gap: var(--gptfa-space-2); flex-wrap: wrap; }
.gptfa-tools-meta { display: flex; gap: var(--gptfa-space-2); flex-wrap: wrap; }
.gptfa-tools-meta span { background: var(--gptfa-surface); border: 1px solid var(--gptfa-border); border-radius: 999px; padding: 6px var(--gptfa-space-3); font-size: var(--gptfa-font-size-xs); font-weight: 700; color: var(--gptfa-muted); }
.gptfa-tools-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: var(--gptfa-space-4); align-items: start; }
.gptfa-tools-sidebar { display: grid; gap: var(--gptfa-space-3); position: sticky; top: var(--gptfa-space-4); }
.gptfa-tools-search { display: grid; gap: 6px; font-size: var(--gptfa-font-size-xs); font-weight: 700; color: var(--gptfa-muted); }
.gptfa-tool-categories { display: flex; flex-wrap: wrap; gap: 6px; }
.gptfa-tool-categories button { border: 1px solid var(--gptfa-border); background: var(--gptfa-surface); border-radius: 999px; padding: 6px var(--gptfa-space-3); font-size: var(--gptfa-font-size-xs); font-weight: 700; cursor: pointer; color: var(--gptfa-muted); }
.gptfa-tool-categories button.active { background: var(--gptfa-accent); border-color: var(--gptfa-accent); color: #fff; }
.gptfa-tools-hint { font-size: var(--gptfa-font-size-xs); color: var(--gptfa-muted); line-height: var(--gptfa-line-normal); padding: var(--gptfa-space-3); border: 1px dashed var(--gptfa-border); border-radius: var(--gptfa-radius-md); }
.gptfa-tools-main { display: grid; gap: var(--gptfa-space-4); min-width: 0; }
.gptfa-tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--gptfa-space-3); }
.gptfa-tool-card, [data-gptfa-tools-grid] > button {
  display: grid; gap: var(--gptfa-space-2); text-align: right; border: 1px solid var(--gptfa-border); background: var(--gptfa-surface);
  border-radius: var(--gptfa-radius-lg); padding: var(--gptfa-space-4); cursor: pointer; box-shadow: var(--gptfa-shadow-xs);
}
.gptfa-tool-card:hover, [data-gptfa-tools-grid] > button:hover { border-color: var(--gptfa-accent); box-shadow: var(--gptfa-ring); }
.gptfa-tool-icon { font-size: 20px; }
.gptfa-tool-runner { display: grid; gap: var(--gptfa-space-4); border: 1px solid var(--gptfa-border); background: var(--gptfa-surface); border-radius: var(--gptfa-radius-xl); padding: var(--gptfa-space-5); }
.gptfa-tool-runner-head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--gptfa-space-3); }
.gptfa-tool-runner-head h3 { margin: 4px 0; font-size: var(--gptfa-font-size-lg); }
.gptfa-tool-runner-head p { margin: 0; color: var(--gptfa-muted); font-size: var(--gptfa-font-size-sm); }
.gptfa-tool-runtime { display: flex; gap: var(--gptfa-space-3); flex-wrap: wrap; }
.gptfa-tool-runtime label { min-width: 160px; flex: 1; }
.gptfa-tool-form { display: grid; gap: var(--gptfa-space-3); }
.gptfa-tool-actions { display: flex; align-items: center; gap: var(--gptfa-space-3); flex-wrap: wrap; }
.gptfa-tool-actions span { font-size: var(--gptfa-font-size-xs); color: var(--gptfa-muted); }
.gptfa-tool-output { border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-lg); overflow: hidden; }
.gptfa-tool-output-head { display: flex; justify-content: space-between; align-items: center; gap: var(--gptfa-space-2); padding: var(--gptfa-space-3); background: var(--gptfa-surface-2); border-bottom: 1px solid var(--gptfa-border); }
.gptfa-tool-output-head div { display: flex; gap: var(--gptfa-space-2); }
.gptfa-tool-output-head button { border: 1px solid var(--gptfa-border); background: var(--gptfa-surface); border-radius: var(--gptfa-radius-sm); padding: 4px var(--gptfa-space-2); font-size: var(--gptfa-font-size-xs); cursor: pointer; }
.gptfa-tool-output-body { padding: var(--gptfa-space-4); line-height: var(--gptfa-line-loose); }

/* ---- Knowledge base ---- */
.gptfa-knowledge-hero { display: grid; gap: var(--gptfa-space-2); margin-bottom: var(--gptfa-space-4); }
.gptfa-knowledge-hero h2 { margin: 0; font-size: clamp(20px, 3vw, 26px); }
.gptfa-knowledge-hero p { margin: 0; color: var(--gptfa-muted); }
.gptfa-kb-grid { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: var(--gptfa-space-4); align-items: start; }
.gptfa-kb-side { display: grid; gap: var(--gptfa-space-3); position: sticky; top: var(--gptfa-space-4); }
.gptfa-kb-stats { display: flex; gap: var(--gptfa-space-2); flex-wrap: wrap; font-size: var(--gptfa-font-size-xs); color: var(--gptfa-muted); }
.gptfa-kb-stats span { background: var(--gptfa-surface-2); border: 1px solid var(--gptfa-border); border-radius: 999px; padding: 4px var(--gptfa-space-2); }
.gptfa-mini-form { display: grid; gap: var(--gptfa-space-2); }
.gptfa-kb-list { display: grid; gap: var(--gptfa-space-2); }
.gptfa-kb-item { display: grid; gap: 2px; border: 1px solid var(--gptfa-border); border-radius: var(--gptfa-radius-md); padding: var(--gptfa-space-3); text-decoration: none !important; color: var(--gptfa-text) !important; }
.gptfa-kb-item.is-active { border-color: var(--gptfa-accent); background: var(--gptfa-accent-soft); }
.gptfa-kb-item small { color: var(--gptfa-muted); font-size: 11px; }
.gptfa-kb-main { display: grid; gap: var(--gptfa-space-4); min-width: 0; }
.gptfa-kb-main h3 { margin: 0; font-size: var(--gptfa-font-size-md); }
.gptfa-kb-source-form { display: grid; gap: var(--gptfa-space-3); }
.gptfa-kb-source-form label { display: grid; gap: 6px; font-size: var(--gptfa-font-size-sm); font-weight: 700; color: var(--gptfa-muted); }

/* ---- Developer / Workspace shells (generic gptfa-shell) ---- */
.gptfa-shell { display: grid; gap: var(--gptfa-space-5); max-width: 1180px; margin: 0 auto; }
.gptfa-developer-shell .gptfa-section-head, .gptfa-knowledge-page .gptfa-section-head { margin-bottom: 0; }
.gptfa-workspace-grid, .gptfa-workspace-overview { display: grid; gap: var(--gptfa-space-4); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gptfa-workspace-list { display: grid; gap: var(--gptfa-space-3); }
.gptfa-workspace-invite-form { display: grid; gap: var(--gptfa-space-3); }

/* =========================================================================
   6. Responsive — tablet (≤1024px)
   ========================================================================= */
@media (max-width: 1024px) {
  .gptfa-pricing-grid, .gptfa-extra-grid, .gptfa-stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gptfa-grid.two, .gptfa-panel-grid.two,
  .gptfa-workspace-grid, .gptfa-workspace-overview,
  .gptfa-tools-layout, .gptfa-kb-grid { grid-template-columns: 1fr; }
  .gptfa-tools-sidebar, .gptfa-kb-side { position: static; }
  .gptfa-chat-topbar {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas: "toggle title" "controls controls";
    align-items: center;
  }
  .gptfa-chat-topbar [data-gptfa-toggle-sidebar] { grid-area: toggle; }
  .gptfa-chat-title { grid-area: title; margin: 0; }
  .gptfa-chat-controls { grid-area: controls; width: 100%; justify-content: stretch; }
  .gptfa-chat-controls select { flex: 1; min-width: 0; max-width: none; }
}

/* =========================================================================
   7. Responsive — mobile (≤860px): chat becomes a full-screen app shell
   ========================================================================= */
@media (max-width: 860px) {
  .gptfa-chatgpt-shell { padding: 0 var(--gptfa-space-2); margin: var(--gptfa-space-2) auto; }
  .gptfa-chatgpt-shell.layout-full { margin: 0; padding: 0; }
  .gptfa-chatgpt-card {
    height: calc(100svh - 16px);
    min-height: 480px;
    grid-template-columns: 1fr;
    border-radius: var(--gptfa-radius-xl);
  }
  /* sidebar becomes an off-canvas drawer, anchored to the inline-start edge (right side in RTL) */
  .gptfa-chat-sidebar {
    position: absolute;
    z-index: 6;
    inset-block: 0;
    inset-inline-start: 0;
    inset-inline-end: auto;
    width: min(320px, 86vw);
    box-shadow: -24px 0 60px rgba(16, 24, 40, .2);
    transform: translateX(110%);
  }
  .gptfa-chatgpt-card:not(.sidebar-collapsed) .gptfa-chat-sidebar { transform: translateX(0); }
  .gptfa-chatgpt-card.sidebar-collapsed { grid-template-columns: 1fr; }
  .gptfa-chatgpt-card.sidebar-collapsed .gptfa-chat-sidebar { transform: translateX(110%); width: min(320px, 86vw); padding: var(--gptfa-pad); border-inline-end: 1px solid var(--gptfa-border); }

  .gptfa-chat-topbar { padding: var(--gptfa-space-2) var(--gptfa-space-3); gap: var(--gptfa-space-2); min-height: 60px; }
  .gptfa-chat-title strong { font-size: var(--gptfa-font-size-sm); }
  .gptfa-chat-controls { gap: 6px; }
  .gptfa-chat-controls select { min-height: 38px; font-size: var(--gptfa-font-size-xs); }
  .gptfa-icon-btn { height: 38px; min-width: 38px; }

  .gptfa-starters { grid-template-columns: 1fr; }
  .gptfa-message-pro, .gptfa-message-pro.user { grid-template-columns: 32px minmax(0, 1fr); gap: var(--gptfa-space-2); }
  .gptfa-message-pro.user .gptfa-avatar { grid-column: 1; }
  .gptfa-message-pro.user .gptfa-message-body { grid-column: 2; justify-self: stretch; }
  .gptfa-message-pro.user .gptfa-bubble { margin-inline-start: auto; }
  .gptfa-avatar { width: 32px; height: 32px; border-radius: var(--gptfa-radius-sm); }
  .gptfa-bubble { border-radius: var(--gptfa-radius-lg); max-width: 100%; }
  .gptfa-chatgpt-shell .gptfa-messages { padding: var(--gptfa-space-3) var(--gptfa-space-3); scroll-padding-bottom: 110px; }
  .gptfa-welcome { padding: var(--gptfa-space-5) var(--gptfa-space-3); gap: var(--gptfa-space-3); }
  .gptfa-welcome h2 { font-size: 19px; }
  .gptfa-welcome-logo, .gptfa-welcome-mark { width: 64px; height: 64px; }

  .gptfa-composer-pro { padding: var(--gptfa-space-2) var(--gptfa-space-2) var(--gptfa-space-3); }
  .gptfa-composer-inner { grid-template-columns: 1fr; border-radius: var(--gptfa-radius-lg); }
  .gptfa-composer-inner textarea { font-size: 16px; /* prevents iOS auto-zoom on focus */ }
  .gptfa-composer-actions { justify-content: space-between; }
  .gptfa-send-btn, .gptfa-stop-btn { flex: 1; }
  .gptfa-composer-foot { font-size: 10.5px; gap: var(--gptfa-space-2); }
  .gptfa-composer-foot span { width: 100%; }
  .gptfa-advanced-row { padding: var(--gptfa-space-2) var(--gptfa-space-3); gap: var(--gptfa-space-3); }

  /* shared page shells */
  .gptfa-pricing, .gptfa-panel, .gptfa-auth-shell, .gptfa-guest-wrap,
  .gptfa-tools-shell, .gptfa-developer-shell, .gptfa-knowledge-page, .gptfa-workspace {
    margin: var(--gptfa-space-4) auto; padding: 0 var(--gptfa-space-3);
  }
  .gptfa-section-head { text-align: center; justify-items: center; margin-bottom: var(--gptfa-space-4); }
  .gptfa-pricing-grid, .gptfa-extra-grid, .gptfa-stats-grid { grid-template-columns: 1fr; gap: var(--gptfa-space-3); }
  .gptfa-price-card, .gptfa-plan, .gptfa-extra-box, .gptfa-panel-card, .gptfa-auth-card, .gptfa-stat, .gptfa-card {
    padding: var(--gptfa-space-4); border-radius: var(--gptfa-radius-lg);
  }
  .gptfa-price-card.featured { transform: none; }
  .gptfa-pay-actions, .gptfa-panel-actions:not(.compact):not(.inline) { display: grid; grid-template-columns: 1fr; gap: var(--gptfa-space-2); }
  .gptfa-pay-actions .gptfa-button, .gptfa-pay-actions .gptfa-link-button,
  .gptfa-panel-actions:not(.compact):not(.inline) .gptfa-button,
  .gptfa-panel-actions:not(.compact):not(.inline) .gptfa-link-button { width: 100%; }
  .gptfa-panel-actions.compact { width: 100%; display: grid; grid-template-columns: repeat(2, 1fr); }
  .gptfa-panel-actions.compact a { width: 100%; }

  .gptfa-account-meta-grid, .gptfa-usage-progress-grid, .gptfa-form-row,
  .gptfa-checkbox-grid { grid-template-columns: 1fr; }
  .gptfa-account-meta-item, .gptfa-usage-progress-card { padding: var(--gptfa-space-3); border-radius: var(--gptfa-radius-md); }
  .gptfa-usage-progress-card > div:first-child { display: grid; gap: 4px; }
  .gptfa-panel-actions.inline.security { display: grid; }
  .gptfa-panel-actions.inline.security .gptfa-link-button,
  .gptfa-panel-actions.inline.security form,
  .gptfa-panel-actions.inline.security button { width: 100%; }

  .gptfa-tools-hero { padding: var(--gptfa-space-4); }
  .gptfa-tools-hero-actions { width: 100%; }
  .gptfa-tools-hero-actions a { flex: 1; }
  .gptfa-tool-runtime label { min-width: 100%; }
  .gptfa-tool-actions { flex-direction: column; align-items: stretch; }

  /* tables degrade to stacked cards on small screens */
  .gptfa-table { min-width: 0; }
  .gptfa-table thead { display: none; }
  .gptfa-table, .gptfa-table tbody, .gptfa-table tr, .gptfa-table td { display: block; width: 100%; }
  .gptfa-table tr { border-bottom: 1px solid var(--gptfa-border); padding: var(--gptfa-space-2) var(--gptfa-space-3); }
  .gptfa-table tr:last-child { border-bottom: 0; }
  .gptfa-table td { border: 0; padding: 6px 0; }
}

@media (max-width: 480px) {
  .gptfa-chatgpt-card { border-radius: 0; border-inline: 0; min-height: 100svh; height: 100svh; }
  .gptfa-chatgpt-shell { padding: 0; margin: 0; }
  .gptfa-section-head h2 { font-size: 22px; }
  .gptfa-otp-channels { gap: var(--gptfa-space-2); }
  .gptfa-captcha-row { grid-template-columns: 1fr 80px 40px; }
  .gptfa-captcha-row img { width: 100%; height: auto; min-height: 50px; }
}

@supports not (height: 100svh) {
  .gptfa-chatgpt-card { height: min(var(--gptfa-chat-height, 780px), calc(100vh - 40px)); }
  @media (max-width: 860px) { .gptfa-chatgpt-card { height: calc(100vh - 16px); } }
  @media (max-width: 480px) { .gptfa-chatgpt-card { height: 100vh; } }
}

/* Respect reduced-motion preference globally for this design system */
@media (prefers-reduced-motion: reduce) {
  .gptfa-chatgpt-shell *, .gptfa-ds-shell * { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* ---- Trust / privacy / terms pages, account panel fine-tuning ---- */
.gptfa-trust-page .gptfa-rich-text { font-size: var(--gptfa-font-size-md); }
.gptfa-trust-actions { display: flex; flex-wrap: wrap; gap: var(--gptfa-space-3); align-items: center; }
.gptfa-trust-actions p { margin: 0; color: var(--gptfa-muted); }
.gptfa-account-panel { gap: var(--gptfa-space-6); }
.gptfa-account-panel .gptfa-section-head p { margin: 4px 0 0; max-width: 760px; }