/* =========================================================================
   Manualistica · chat UI
   Brand-inspired (Tecnoimpianti) · usability-first
   ========================================================================= */

/* ---------- Design tokens ------------------------------------------------ */
:root {
  /* Brand colours (rgb triplets so we can modulate with / alpha) */
  --ti-blue:    61 151 205;
  --ti-green:   76 183 114;
  --ti-dark:    29 29 27;
  --ti-light:   234 234 234;
  --ti-muted:   93 93 93;

  /* Light theme (default) */
  --bg:            #ffffff;
  --bg-soft:       #f6f7f8;
  --bg-panel:      #ffffff;
  --fg:            rgb(var(--ti-dark));
  --fg-muted:      rgb(var(--ti-muted));
  --fg-on-accent:  #ffffff;
  --border:        #e3e5e8;
  --border-strong: #c9ccd1;
  --accent:        rgb(var(--ti-blue));
  --accent-soft:   rgb(var(--ti-blue) / 0.08);
  --success:       rgb(var(--ti-green));
  --success-soft:  rgb(var(--ti-green) / 0.08);
  --warning:       #b58900;
  --warning-soft:  #fff6dc;
  --danger:        #c9302c;
  --danger-soft:   #fdecec;

  /* Typography */
  --font-display: 'Space Grotesk', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-body:    'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Scale */
  --fs-eyebrow:  11px;
  --fs-meta:     12px;
  --fs-body:     17px;   /* leggibilità industriale */
  --fs-body-sm:  14px;
  --fs-h4:       19px;
  --fs-h3:       24px;
  --fs-h2:       34px;
  --fs-hero:     56px;
  --lh-body:     1.65;
  --lh-tight:    1.25;

  /* Geometry */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --header-h:  64px;
  --composer-min-h: 112px;

  /* Motion */
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --dur-fast: 180ms;
  --dur-med:  320ms;
  --dur-slow: 480ms;
}

[data-theme="dark"] {
  --bg:            #0e1116;
  --bg-soft:       #151a21;
  --bg-panel:      #1a1f27;
  --fg:            #e6edf3;
  --fg-muted:      #9aa3ad;
  --border:        #252c35;
  --border-strong: #3a4250;
  --accent-soft:   rgb(var(--ti-blue) / 0.15);
  --success-soft:  rgb(var(--ti-green) / 0.15);
  --warning-soft:  rgb(181 137 0 / 0.18);
  --danger-soft:   rgb(201 48 44 / 0.2);
}

/* ---------- Reset (minimale, non invasivo) ------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--fg);
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.55; }
input, textarea, select { font: inherit; color: inherit; }
select { cursor: pointer; }
::selection { background: var(--accent-soft); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* Universal focus ring (a11y first) */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- Typography helpers ------------------------------------------ */
.eyebrow {
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.mono { font-family: var(--font-mono); font-feature-settings: 'ss01', 'zero'; }

/* ---------- Header ------------------------------------------------------ */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 20px;
  height: var(--header-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: 0;
  font-size: 15px;
  text-decoration: none;
  color: var(--fg);
}
.brand:hover { color: var(--accent); }
.brand-logo {
  /* Cap by height (so the header keeps a fixed bar height) and let the
     width grow up to a sane max. Horizontal wordmarks render fully;
     square icon logos cap at 28x28 as before. */
  max-height: 28px;
  max-width: 140px;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}
.brand-product {
  line-height: 1;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.01em;
  font-size: 15px;
  /* Always one line — narrow viewports / wide logos must not push the
     product label onto a second row. */
  white-space: nowrap;
}
.brand-badge {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border: 1px solid var(--border-strong);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: var(--font-display);
  font-weight: 500;
}
.header-controls {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.corpus-chip {
  color: var(--fg-muted);
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.icon-btn {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.icon-btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.icon-btn svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.6; }

/* ---------- Status dot (compact health indicator) ---------------------- */
.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  cursor: default;
}
.status-pill .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--fg-muted);
}
.status-pill.is-ok      .dot { background: var(--success); box-shadow: 0 0 0 3px var(--success-soft); }
.status-pill.is-busy    .dot { background: var(--warning); animation: pulse 1.2s var(--ease-out) infinite; }
.status-pill.is-reading .dot { background: var(--accent);  animation: pulse 1.2s var(--ease-out) infinite; }
.status-pill.is-error   .dot { background: var(--danger);  box-shadow: 0 0 0 3px var(--danger-soft); }
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 currentColor; opacity: 1; }
  70%  { box-shadow: 0 0 0 6px transparent; opacity: 0.7; }
  100% { box-shadow: 0 0 0 0 transparent; opacity: 1; }
}

/* ---------- Main layout ------------------------------------------------- */
.app-main {
  display: grid;
  grid-template-columns: 440px 1fr;
  gap: 0;
  height: calc(100vh - var(--header-h));
  min-height: 0;
}
.chat-column {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--border);
  background: var(--bg);
}
.pages-column {
  min-height: 0;
  overflow: hidden;          /* viewport-bound: stage+strip must fit without outer scroll */
  padding: 16px 20px;
  background: var(--bg-soft);
  display: flex;
  flex-direction: column;
}
#pagesArea {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
@media (max-width: 1279px) {
  .app-main { grid-template-columns: 380px 1fr; }
  .pages-column { padding: 14px 16px; }
}

/* ---------- Transcript & composer -------------------------------------- */
.transcript {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 20px 20px 12px;
  scroll-padding-bottom: 120px;
}
.composer {
  border-top: 1px solid var(--border);
  padding: 12px 14px;
  background: var(--bg);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: stretch;       /* textarea and button grow to the same height */
}
#chatInput {
  min-height: 48px;
  max-height: 160px;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--bg);
  font-size: 15px;             /* slightly smaller to avoid the placeholder wrapping on narrow sidebars */
  line-height: 1.4;
  resize: none;
  width: 100%;
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
#chatInput:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
#chatInput::placeholder {
  color: var(--fg-muted);
  /* Single-line placeholder even on narrow sidebars */
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}
/* Let the button match the textarea height automatically */
.composer .ti-btn {
  min-height: 0;
  height: auto;
  align-self: stretch;
  min-width: 104px;
  padding: 0 22px;
}

/* ---------- Empty state (first load) ----------------------------------- */
.empty-state {
  padding: 24px 4px;
}
.empty-state h1 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: var(--lh-tight);
  margin: 0 0 8px;
}
.empty-state h1 b { font-weight: 700; letter-spacing: -0.015em; }
.empty-state .intro {
  color: var(--fg-muted);
  font-size: var(--fs-body-sm);
  margin: 0 0 20px;
}
.empty-state .suggest-label {
  margin: 22px 0 10px;
  display: block;
}
.suggestions { display: flex; flex-direction: column; gap: 8px; }
.suggestion {
  text-align: left;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-size: var(--fs-body-sm);
  color: var(--fg);
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  line-height: 1.45;
  min-height: 44px;
}
.suggestion::before {
  content: "▸ ";
  color: var(--accent);
  font-weight: 700;
  margin-right: 6px;
}
.suggestion:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- Chat bubbles ------------------------------------------------ */
.bubble {
  margin: 0 0 18px;
  animation: fadeUp var(--dur-med) var(--ease-out);
}
.bubble.user {
  display: flex;
  justify-content: flex-end;
}
.bubble.user .content {
  max-width: 88%;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  font-size: var(--fs-body-sm);
  line-height: 1.45;
}
.bubble.agent .content {
  border-left: 2px solid var(--accent);
  padding: 2px 0 2px 14px;
  max-width: 68ch;
}
.bubble.agent .content p,
.bubble.agent .content ol,
.bubble.agent .content ul { margin: 0 0 10px; }
.bubble.agent .content ol,
.bubble.agent .content ul { padding-left: 22px; }
.bubble.agent .content ol li,
.bubble.agent .content ul li { margin-bottom: 6px; }
.bubble.agent .content h4 {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 14px 0 8px;
}
.bubble.agent .content strong { font-weight: 700; }
.bubble.agent .content em     { font-style: italic; color: var(--fg); }
.bubble.agent .content .num   {        /* numeri azionabili */
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.bubble.agent .content code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-soft);
  padding: 1px 5px;
  border-radius: 3px;
}

/* Streaming caret */
.bubble.agent .content .caret {
  display: inline-block;
  width: 2px; height: 1em;
  background: var(--accent);
  vertical-align: -2px;
  margin-left: 2px;
  animation: blink 1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Safety callout --------------------------------------------- */
.safety {
  background: var(--warning-soft);
  border-left: 3px solid var(--warning);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin: 8px 0 12px;
  font-size: var(--fs-body-sm);
}
.safety::before {
  content: "⚠ ";
  font-weight: 700;
  color: var(--warning);
  margin-right: 2px;
}

/* ---------- Citation chip ---------------------------------------------- */
.cit {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-soft);
  border: 1px solid var(--border-strong);
  color: var(--fg);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0;
  margin: 0 2px;
  line-height: 1.6;
  min-height: 22px;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.cit:hover, .cit:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}
.cit .ico { width: 11px; height: 11px; opacity: 0.7; }
.cit .pg  { font-weight: 700; }

/* ---------- Tool-calls (collapsible, secondary) ----------------------- */
.tool-calls-wrap { margin: 6px 0 14px; }
.tool-calls-toggle {
  background: none;
  border: none;
  padding: 0;
  color: var(--fg-muted);
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.tool-calls-toggle:hover { color: var(--accent); }
.tool-calls-toggle[aria-expanded="true"] + ul { display: block; }
.tool-calls-list {
  display: none;
  list-style: none;
  padding: 6px 0 0 10px;
  margin: 0;
  border-left: 1px dashed var(--border-strong);
}
.tool-calls-list li {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  color: var(--fg-muted);
  padding: 3px 0;
}

/* ---------- Pages column (right panel): stage + strip ------------------ */
.pages-empty {
  flex: 1 1 auto;
  display: grid;
  place-items: center;
  padding: 40px 24px;
  text-align: center;
  min-height: 0;
}
.pages-empty .hero-mark {
  /* Caps height for square (icon) logos; horizontal wordmarks scale the
     width up to a sane maximum without distortion. */
  max-height: 88px;
  max-width: 320px;
  width: auto;
  height: auto;
  object-fit: contain;
  margin: 0 auto 24px;
  display: block;
}
.pages-empty h1 {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 10px;
}
.pages-empty h1 b { font-weight: 700; }
.pages-empty .tag {
  color: var(--fg-muted);
  font-size: var(--fs-body);
  margin: 0 0 10px;
}
.pages-empty .corpus-stats {
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-top: 4px;
}

/* Stage layout: big active page on top, scrollable thumbnail strip below.
   The whole block fills the pages-column height and never scrolls the outer
   column — the only scroll allowed is the horizontal strip. */
.pages-stage {
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: 100%;
  min-height: 0;
  /* On very wide columns keep a max width so the A4 image doesn't float in
     empty space — gives a tidy, intentional look */
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}
.stage-top {
  flex: 1 1 auto;       /* eats remaining height */
  min-height: 0;        /* critical: allows flex child to shrink below content size */
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.stage-meta {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: var(--fs-meta);
  color: var(--fg-muted);
  padding: 0 2px;
}
.stage-meta .title {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--fg);
  font-size: var(--fs-body-sm);
  letter-spacing: 0;
  text-transform: none;
}
.stage-meta .pg { font-family: var(--font-mono); }

.stage-main {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;        /* frame inherited from pages-column bg */
  border: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: zoom-in;
  padding: 0;
  transition: filter var(--dur-fast) var(--ease-out);
}
.stage-main:hover img, .stage-main:focus-visible img { filter: brightness(1.02); }
.stage-main:hover, .stage-main:focus-visible { outline: none; }
.stage-main img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 14px 50px -18px rgb(0 0 0 / 0.55),
              0 2px 10px -4px rgb(0 0 0 / 0.25);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  animation: fadeUp var(--dur-med) var(--ease-out);
}
.stage-main .zoom-badge {
  position: absolute;
  top: 12px; right: 12px;
  display: inline-flex; align-items: center; gap: 6px;
  background: rgb(var(--ti-dark) / 0.75);
  color: #fff;
  padding: 5px 9px;
  border-radius: 4px;
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  backdrop-filter: blur(4px);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.stage-main:hover .zoom-badge,
.stage-main:focus-visible .zoom-badge { opacity: 1; }
.stage-main .zoom-badge svg { width: 12px; height: 12px; stroke: currentColor; fill: none; stroke-width: 1.8; }

.stage-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: rgb(var(--ti-dark) / 0.65);
  color: #fff;
  border: 1px solid rgb(255 255 255 / 0.15);
  backdrop-filter: blur(6px);
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  z-index: 2;
  cursor: pointer;
}
.stage-main:hover .stage-nav { opacity: 0.9; }
.stage-nav:hover { opacity: 1; background: rgb(var(--ti-blue)); }
.stage-prev { left: 12px; }
.stage-next { right: 12px; }
.stage-nav:disabled { opacity: 0.3 !important; cursor: not-allowed; }

/* Thumbnail strip below (fixed height so stage consumes the rest) */
.pages-strip {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 170px;
}
.strip-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.strip-header .count { color: var(--fg-muted); font-size: var(--fs-meta); }
.strip-list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 2px 2px 8px;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.strip-list::-webkit-scrollbar { height: 8px; }
.strip-list::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
.strip-list::-webkit-scrollbar-track { background: transparent; }

.thumb-card {
  flex: 0 0 auto;
  width: 78px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              opacity var(--dur-med) var(--ease-out);
  position: relative;
  animation: fadeUp var(--dur-med) var(--ease-out);
}
.thumb-card:hover, .thumb-card:focus-visible {
  border-color: var(--accent);
  transform: translateY(-2px);
  outline: none;
}
.thumb-card.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.thumb-card.is-latest:not(.is-active) {
  border-color: rgb(var(--ti-green) / 0.5);
  box-shadow: 0 0 0 1px rgb(var(--ti-green) / 0.15);
}
.thumb-card.is-other { opacity: 0.72; }
.thumb-card .thumb-wrap {
  aspect-ratio: 1 / 1.414;
  border-radius: 3px;
  overflow: hidden;
  background: var(--bg-soft);
}
.thumb-card img {
  width: 100%; height: 100%;
  object-fit: cover; object-position: top;
}
/* Broken page image (manual deleted after chat saved) — dimmed placeholder */
img.is-missing {
  object-fit: contain !important;
  object-position: center !important;
  opacity: 0.75;
  background: var(--bg-soft);
  filter: grayscale(0.2);
}
.thumb-card .pg {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--fg-muted);
  text-align: center;
}
.thumb-card.is-active .pg { color: var(--accent); font-weight: 700; }

.strip-section-sep {
  width: 1px;
  background: var(--border);
  flex: 0 0 auto;
  margin: 4px 2px;
  align-self: stretch;
}

/* ---------- User menu (top-right) ------------------------------------- */
.user-menu { position: relative; }
.user-menu-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 260px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px -10px rgb(0 0 0 / 0.2);
  padding: 8px;
  z-index: 60;
}
.user-menu-panel[hidden] { display: none; }
.user-menu-header {
  padding: 10px 12px 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}
.user-menu-header .user-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--fs-body-sm);
  color: var(--fg);
}
.user-menu-header .user-email {
  font-size: var(--fs-meta);
  color: var(--fg-muted);
  word-break: break-all;
  margin-top: 2px;
}
.user-menu-header .user-role {
  margin-top: 6px;
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 2px 8px;
  border: 1px solid var(--accent-soft);
  background: var(--accent-soft);
  border-radius: 3px;
}
.user-menu-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border: 0;
  background: transparent;
  color: var(--fg);
  font-size: var(--fs-body-sm);
  font-family: var(--font-body);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
}
/* Respect the [hidden] HTML attribute — `display: block` above would
   otherwise win the cascade and leak admin-only links to plain users. */
.user-menu-item[hidden] { display: none; }
.user-menu-item:hover { background: var(--bg-soft); }
.user-menu-item.danger { color: var(--danger); }
.user-menu-item.danger:hover { background: var(--danger-soft); }

/* Change-password modal */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgb(0 0 0 / 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 20px;
}
.modal-backdrop[hidden] { display: none; }
.modal-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 60px -20px rgb(0 0 0 / 0.4);
}
.modal-card h2 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  margin: 0 0 4px;
}
.modal-card .intro {
  color: var(--fg-muted);
  font-size: var(--fs-body-sm);
  margin: 0 0 18px;
}
.modal-card form { display: flex; flex-direction: column; gap: 12px; }

/* Field styling shared by login.html and every modal that uses the
   .login-field structure (Cambia password, Nuovo utente …). Was originally
   only defined inline on login.html; moved here so dialogs in chat /
   admin / manuals stop falling back to browser defaults (which render as
   black boxes under prefers-color-scheme: dark). */
.login-field { display: block; }
.login-field label {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 0 0 6px;
}
.login-field input,
.login-field select {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--bg);
  color: var(--fg);
  font: 400 15px var(--font-body);
  appearance: none;
  -webkit-appearance: none;
  transition: border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}
.login-field input:focus,
.login-field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.login-field input::placeholder { color: var(--fg-muted); }
.modal-card .actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 6px;
}
.modal-card .actions .ti-btn { min-width: 100px; }

/* ---------- History drawer (localStorage chat history) ---------------- */
.history-panel {
  position: fixed;
  top: 0; right: 0;
  width: 340px;
  max-width: 94vw;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  box-shadow: -16px 0 40px -20px rgb(0 0 0 / 0.3);
  z-index: 120;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--dur-med) var(--ease-out);
}
.history-panel[aria-hidden="false"] { transform: translateX(0); }

.history-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
}
.history-actions {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
/* Ghost variant of the brand button — used in dialog actions, history
   drawer header, etc. The width:100% / min-height:44px pair below was
   originally written for the "+ Nuova conversazione" button in the chat
   history drawer; it had been left global which made every Cancel button
   in every modal stretch full-width and break the action row layout.
   Keep the visual chrome (bg/color/no-overlay) global, but scope the
   sizing override to the actual drawer where it's wanted. */
.ti-btn.btn-ghost {
  background: var(--bg-soft);
  color: var(--fg);
}
.ti-btn.btn-ghost::after { opacity: 0; }
.ti-btn.btn-ghost:hover::after { opacity: 1; }
.history-actions .ti-btn.btn-ghost {
  width: 100%;
  min-height: 44px;
}

/* Destructive variant — used by the "Elimina" confirm in the manuals page
   (and reusable elsewhere). Keeps the same shape as .ti-btn but swaps the
   palette so the action's intent is unmistakable. */
.ti-btn.btn-danger {
  background: var(--danger);
  color: #fff;
}
.ti-btn.btn-danger::after { background: rgb(0 0 0 / 0.18); }
.ti-btn.btn-danger:hover::after { opacity: 1; }
.ti-btn.btn-ghost:hover span { color: #fff; }

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}
.history-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  align-items: center;
  padding: 12px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background var(--dur-fast) var(--ease-out);
}
.history-item:hover { background: var(--bg-soft); }
.history-item.is-current {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding-left: 13px;
}
.history-item .title {
  font-size: var(--fs-body-sm);
  font-weight: 500;
  line-height: 1.35;
  color: var(--fg);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  grid-column: 1;
}
.history-item .meta {
  grid-column: 1;
  margin-top: 4px;
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-family: var(--font-display);
}
.history-item .delete-btn {
  grid-column: 2; grid-row: 1 / span 2;
  width: 32px; height: 32px;
  border: 0;
  background: transparent;
  color: var(--fg-muted);
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  display: grid; place-items: center;
}
.history-item:hover .delete-btn,
.history-item:focus-within .delete-btn { opacity: 1; }
.history-item .delete-btn:hover { color: var(--danger); background: var(--danger-soft); }
.history-item .delete-btn svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.8; }

.history-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--fg-muted);
  font-size: var(--fs-body-sm);
}

.history-backdrop {
  position: fixed; inset: 0;
  background: rgb(0 0 0 / 0.35);
  z-index: 110;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.history-backdrop[aria-hidden="false"] {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- In-chat thinking indicator --------------------------------- */
.thinking {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg-muted);
  font-size: var(--fs-body-sm);
  font-style: italic;
  min-height: 20px;
}
.thinking .dots { display: inline-flex; gap: 3px; }
.thinking .dots span {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
  animation: thinking-dot 1.3s var(--ease-out) infinite;
}
.thinking .dots span:nth-child(2) { animation-delay: 0.15s; }
.thinking .dots span:nth-child(3) { animation-delay: 0.3s; }
@keyframes thinking-dot {
  0%, 60%, 100% { transform: scale(0.85); opacity: 0.45; }
  30%           { transform: scale(1.1);  opacity: 1; }
}
.thinking-trail {
  display: block;
  color: var(--fg-muted);
  font-size: var(--fs-meta);
  font-style: italic;
  margin-top: 2px;
  padding-left: 2px;
}
/* When the thinking row follows streamed markdown, add a little breathing room */
.bubble.agent .stream:not(:empty) + .thinking {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}
.thinking[hidden] { display: none; }

/* ---------- Lightbox ---------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgb(var(--ti-dark) / 0.95);
  backdrop-filter: blur(3px);
  z-index: 200;
  display: none;
  flex-direction: column;
  animation: fadeIn var(--dur-fast) var(--ease-out);
}
.lightbox[aria-hidden="false"] { display: flex; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.lightbox-stage {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 20px;
  overflow: auto;
  touch-action: pinch-zoom;
}
.lightbox-stage img {
  max-width: 96vw;
  max-height: 86vh;
  cursor: zoom-out;
}
.lightbox .icon-btn {
  color: rgba(255, 255, 255, 0.9);
  background: rgb(255 255 255 / 0.05);
  border: 1px solid rgb(255 255 255 / 0.2);
}
.lightbox .icon-btn:hover {
  border-color: rgb(var(--ti-blue));
  background: rgb(var(--ti-blue) / 0.2);
  color: #fff;
}
.lightbox-close {
  position: absolute;
  top: 16px; right: 16px;
  z-index: 2;
}
.lightbox-prev, .lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px; height: 48px;
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1;
}
.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }
.lightbox-footer {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: rgb(var(--ti-dark) / 0.75);
  color: rgba(255, 255, 255, 0.9);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-body-sm);
}
.lightbox-footer .info { font-family: var(--font-mono); font-size: var(--fs-meta); }

/* ---------- Error toast (persistent) ----------------------------------- */
.toast {
  position: fixed;
  bottom: 20px; left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  max-width: 520px;
  background: var(--danger-soft);
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  display: none;
  align-items: center;
  gap: 12px;
  box-shadow: 0 10px 30px -10px rgb(0 0 0 / 0.25);
}
.toast.show { display: flex; }
.toast .retry-btn {
  margin-left: auto;
  border: 1px solid var(--danger);
  background: transparent;
  color: var(--danger);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-body-sm);
  font-weight: 600;
}
.toast .retry-btn:hover { background: var(--danger); color: #fff; }

/* ---------- .ti-btn (brand primary) ------------------------------------ */
.ti-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  min-width: 132px;
  padding: 0 28px;
  border: 0;
  border-radius: var(--radius-sm);
  background: rgb(var(--ti-dark));
  color: #fff;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  overflow: hidden;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.ti-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(70% 300% at 15% 50%, rgb(var(--ti-green)) 0%, rgb(var(--ti-blue)) 100%);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
  z-index: 0;
}
.ti-btn:hover::after { opacity: 1; }
.ti-btn span { position: relative; z-index: 1; }
.ti-btn:disabled::after { opacity: 0 !important; }
[data-theme="dark"] .ti-btn { background: rgb(var(--ti-light)); color: rgb(var(--ti-dark)); }
[data-theme="dark"] .ti-btn:hover span { color: #fff; }

/* ---------- Responsive: tablet portrait & mobile (<1024px) ------------- */
@media (max-width: 1023.98px) {
  .app-main {
    display: block;
    height: auto;
    min-height: calc(100vh - var(--header-h));
  }
  .pages-column {
    overflow: auto;          /* under mobile layout we allow vertical scroll again,
                                because the chat drawer lives at bottom */
    min-height: calc(100vh - var(--header-h));
    padding-bottom: 180px;   /* space for drawer grabber */
  }
  .chat-column {
    position: fixed;
    left: 0; right: 0;
    bottom: 0;
    z-index: 40;
    border-right: 0;
    border-top: 1px solid var(--border);
    box-shadow: 0 -10px 30px -12px rgb(0 0 0 / 0.18);
    background: var(--bg);
    max-height: 85vh;
    transition: transform var(--dur-med) var(--ease-out), max-height var(--dur-med) var(--ease-out);
  }
  .chat-column[data-drawer-state="collapsed"] {
    transform: translateY(calc(100% - var(--composer-min-h) - 24px));
  }
  .chat-column[data-drawer-state="mid"]      { transform: translateY(calc(100% - 45vh)); }
  .chat-column[data-drawer-state="expanded"] { transform: translateY(0); }
  .drawer-grabber {
    display: block;
    height: 24px;
    cursor: grab;
    position: relative;
  }
  .drawer-grabber::before {
    content: "";
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px; height: 4px;
    background: var(--border-strong);
    border-radius: 2px;
  }
  .transcript { padding: 10px 16px 4px; }
}
@media (min-width: 1024px) {
  .drawer-grabber { display: none; }
}

/* Smaller phones */
@media (max-width: 540px) {
  :root { --fs-body: 16px; }
  .pages-column { padding: 14px 12px 180px; }
  .pages-empty h1 { font-size: 36px; }
  .thumb-card { width: 68px; }
  .ti-btn { min-width: 100px; padding: 0 18px; }
  .header-controls .manual-filter { max-width: 150px; }
}

/* ---------- Utility ----------------------------------------------------- */
.hidden { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}