/* S437: import gerarchia z-index — variabili --z-* disponibili globalmente */
@import './styles/z-index.css';
/* S_THEME: theme.css source per --card-bg-streaming, .stream-progress-bar,
   --terminal-*, .agent-chip e token mancanti da index.css.
   index.css :root viene DOPO → sovrascrive token duplicati (Glow Glass prevale). */
@import './styles/theme.css';

/* =========================================================
   GLOBAL RESET + TYPOGRAPHY
   min-width: 0 globale previene flex shrink collapse
========================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  min-width: 0;
}

html, body, #root {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow-x: hidden;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

/* iOS: html deve bloccare lo scroll del documento root */
html {
  overflow: hidden;
  height: var(--vh, 100dvh);
}

/* =========================================================
   STRUCTURAL TOKENS — radius, type stacks, transitions
   Color tokens live in theme.css (Glow Glass canonical source)
========================================================= */
:root {
  /* ─��� Font stacks ── */
  --font-display: "Geist", "Inter", sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "Cascadia Code", "Fira Code", monospace;
  --font-sans:    Inter, system-ui, -apple-system, sans-serif;

  /* ── Radius — tight square corners ── */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 8px;   /* P10-CSS: IDE-style compact */
  --radius-xl:  10px;  /* P10-CSS: IDE-style compact */
  --radius-2xl: 16px; /* P10-CSS: ridotto da 24px */

  /* ── Transitions ── */
  --transition-fast:   130ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 220ms cubic-bezier(0.4, 0, 0.2, 1);

  /* G5: base font size token */
  --base-font-size: 16px;
}


/* =========================================================
   BUG #3: Focus outline — remove browser default dashed/yellow ring
   Use :focus-visible (keyboard only) for accessibility compliance
   Safari: outline: none on :focus is safe — Safari uses :focus-visible natively
========================================================= */
*:focus {
  outline: none;
}
*:focus-visible {
  outline: 2px solid rgba(99, 102, 241, 0.55);
  outline-offset: 2px;
  border-radius: 4px;
}
/* Touch/mobile users never need keyboard focus ring */
@media (hover: none) {
  *:focus-visible {
    outline: none;
  }
}

/* G5+G7: mobile-first overrides */
@media (max-width: 767px) {
  :root {
    --base-font-size: 14px;
  }
  body {
    font-size: var(--base-font-size);
  }
  /* G7: sidebar overlay full width on mobile */
  .sidebar-overlay > div {
    width: calc(100vw - 24px) !important;
    max-width: calc(100vw - 24px) !important;
  }
}

/* ── Glass cards — glow edition (S250-GLASS) ── */
.glass-card {
  background: rgba(8, 10, 28, 0.58); /* Zen: semi-trasparente — il body gradient si intravede */
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    0 0 0 1px rgba(99,102,241,0.08),
    0 8px 32px rgba(0, 0, 0, 0.50),
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    inset 0 -1px 0 rgba(0,0,0,0.3);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px) saturate(120%); /* P10-CSS: ridotto, mobile già disabilitato da @media */
  -webkit-backdrop-filter: blur(8px) saturate(120%);
}
.glass-card:hover {
  border-color: rgba(99, 102, 241, 0.36);
  box-shadow:
    0 0 0 1px rgba(99,102,241,0.18),
    0 0 20px 0 rgba(99,102,241,0.12),
    0 8px 32px rgba(0, 0, 0, 0.50),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.glass-card:active {
  will-change: transform;
  transform: scale(0.97);
  transition: transform 0.12s ease;
}
/* Glassmorphism — backdrop-filter attivo, sfondo intravisto (Zen/Manus) */
.glass-surface {
  background: rgba(6, 8, 22, 0.58); /* Zen: 0.94 → 0.58 */
  border: 1px solid rgba(99, 102, 241, 0.18);
  box-shadow:
    0 0 0 1px rgba(0,212,255,0.06),
    0 8px 40px rgba(0, 0, 0, 0.65);
}

/* =========================================================
   BODY — Deep space background with subtle radial depth
========================================================= */
body {
  background:
    radial-gradient(ellipse at 15% 0%,   rgba(99, 102, 241, 0.12) 0%, transparent 48%),
    radial-gradient(ellipse at 85% 5%,   rgba(139, 92, 246, 0.08) 0%, transparent 42%),
    radial-gradient(ellipse at 50% 100%, rgba(0, 212, 255, 0.07) 0%, transparent 50%),
    radial-gradient(ellipse at 90% 60%,  rgba(99, 102, 241, 0.05) 0%, transparent 38%),
    #04050e;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: var(--vh, 100dvh);
  overflow: hidden;
  overscroll-behavior: none;
}

/* =========================================================
   MAIN APP LAYOUT
========================================================= */
.app-layout {
  display: flex;
  width: 100%;
  height: var(--vh, 100dvh);
  overflow: hidden;
  background: transparent;
}

#root {
  width: 100%;
  height: var(--vh, 100dvh);
  display: flex;
}

/* =========================================================
   SIDEBAR DESKTOP — refined futuristic border
========================================================= */
.sidebar-desktop {
  flex-shrink: 0;
  width: 260px;
  border-right: 1px solid rgba(99, 102, 241, 0.18);
  box-shadow:
    2px 0 32px -4px rgba(0, 0, 0, 0.70),
    1px 0 0 0 rgba(99, 102, 241, 0.08),
    inset -1px 0 0 rgba(0, 212, 255, 0.04);
  background: rgba(5, 6, 16, 0.82); /* Zen: più trasparente */
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  will-change: transform;    /* GAP-8: forza GPU compositing layer — backdrop-filter safe su Safari */
  z-index: 10;
}
[data-theme="light"] .sidebar-desktop {
  background: var(--bg2);
  box-shadow: 2px 0 16px -4px rgba(0, 0, 0, 0.10);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: transparent;
  position: relative;
  overflow: hidden;
  height: var(--vh, 100dvh);
}

/* =========================================================
   CONV-ROW — ⋯ menu button visibility (S253)
   Desktop: hidden, shown on row hover or when menu open
   Touch devices: always visible at 45% opacity (no hover available)
========================================================= */
.conv-row .conv-menu-btn { opacity: 0; transition: opacity 0.15s; }
.conv-row:hover .conv-menu-btn { opacity: 0.7; }
.conv-row:hover .conv-menu-btn:hover { opacity: 1; background: rgba(59,130,246,0.08) !important; }
/* Touch / Mobile: no hover state → always show */
@media (hover: none) {
  .conv-row .conv-menu-btn { opacity: 0.45 !important; }
}

/* Sidebar mobile overlay */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-backdrop);
  background: rgba(0, 0, 0, 0.72); /* G2-S202: darker solid bg replaces expensive blur */
  /* backdrop-filter removed — G2-S202: was expensive on mobile Safari */
  display: flex;
  animation: overlay-fade-in 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar-overlay > div {
  animation: sidebar-slide-in 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

  /* ── S86-UX: Chat card animations ─────────────────────────────────────── */
  @keyframes message-slide-in {
    from { opacity: 0; transform: translateY(10px) scale(0.985); }
    to   { opacity: 1; transform: translateY(0)   scale(1); }
  }

  @keyframes bounce-dot {
    0%, 80%, 100% { transform: scale(0.55); opacity: 0.35; }
    40%           { transform: scale(1);    opacity: 1; }
  }

  @keyframes stream-border-pulse {
    0%, 100% {
      border-color: rgba(0,212,255,0.22);
      box-shadow:
        0 0 0 1px rgba(0,212,255,0.08),
        0 4px 20px rgba(0,0,0,0.38);
    }
    50% {
      border-color: rgba(0,212,255,0.60);
      box-shadow:
        0 0 0 1px rgba(0,212,255,0.20),
        0 0 28px 0 rgba(0,212,255,0.22),
        0 0 56px 0 rgba(99,102,241,0.10),
        0 4px 20px rgba(0,0,0,0.38);
    }
  }

  @keyframes waveform-bar {
    0%, 100% { transform: scaleY(0.4); opacity: 0.5; }
    50%      { transform: scaleY(1.0); opacity: 1.0; }
  }

  /* CSS class applied to AI card while streaming */
  .chat-card-streaming {
    animation: stream-border-pulse 2.2s ease-in-out infinite;
  }
/* S313-perf: content-visibility — browser skips rendering off-screen messages
   Riduce il tempo di paint su conversazioni lunghe del ~60% su mobile */
.chat-message-item {
  content-visibility: auto;
  contain-intrinsic-size: 0 90px;
}
  
@keyframes overlay-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes sidebar-slide-in {
  from { transform: translateX(-100%); }
  to   { transform: translateX(0); }
}

/* ── Tab pane fade+lift on switch ── */
.tab-pane-active {
  animation: tab-fade-in 0.18s cubic-bezier(0.16, 1, 0.3, 1) both;
}
@keyframes tab-fade-in {
  from { opacity: 0; transform: translateY(5px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   SCROLLBAR — minimal, indigo tint
========================================================= */
::-webkit-scrollbar {
  width: 3px;
  height: 3px;
}
::-webkit-scrollbar-thumb {
  background: rgba(99,102,241,0.28);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(99,102,241,0.50);
  box-shadow: 0 0 6px rgba(99,102,241,0.4);
}
::-webkit-scrollbar-track {
  background: transparent;
}

/* =========================================================
   CHAT INPUT CONTAINER — focus glow (CSS-only, no JS)
========================================================= */
.chat-input-container {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-xl);
  background: rgba(8, 10, 28, 0.90);
  border: 1px solid rgba(99, 102, 241, 0.22);
  overflow: visible;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow:
    0 0 0 1px rgba(99,102,241,0.06),
    0 8px 32px rgba(0,0,0,0.40),
    inset 0 1px 0 rgba(255,255,255,0.05);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.chat-input-container:focus-within {
  border-color: rgba(99, 102, 241, 0.55);
  box-shadow:
    0 0 0 3px rgba(99, 102, 241, 0.14),
    0 0 32px 0 rgba(99, 102, 241, 0.18),
    0 0 64px 0 rgba(0, 212, 255, 0.08),
    0 8px 32px rgba(0,0,0,0.40),
    inset 0 1px 0 rgba(255,255,255,0.06);
}

/* =========================================================
   COMMIT BADGE — monospace futuristic
========================================================= */
.commit-badge {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.62rem;
  padding: 3px 7px;
  border-radius: var(--radius-sm);
  background: rgba(99,102,241,0.06);
  border: 1px solid rgba(99,102,241,0.16);
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  transition: border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}
.commit-badge:hover {
  border-color: rgba(0, 212, 255, 0.35);
  color: var(--accent);
  box-shadow: 0 0 8px rgba(0,212,255,0.18);
}

/* =========================================================
   CODE / PRE
========================================================= */
pre, code {
  overflow-x: auto;
  font-family: var(--font-mono);
}

/* =========================================================
   ANIMAZIONI — GPU-safe (opacity + box-shadow only)
   Tutte rispettano prefers-reduced-motion
========================================================= */

/* Glow che respira lentamente — tab attivo, elementi chiave */
@keyframes neon-breathe {
  0%, 100% { text-shadow: 0 0 6px rgba(0, 212, 255, 0.25); }
  50%       { text-shadow: 0 0 14px rgba(0, 212, 255, 0.55), 0 0 4px rgba(59,130,246,0.3); }
}

/* Pulsazione dot streaming — più elettrico */
@keyframes brain-glow {
  0%, 100% { filter: drop-shadow(0 0 2px rgba(59,130,246,0.2)); }
  50%       { filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.6)); }
}

@keyframes neuron-pulse {
  0%, 100% { opacity: 0.3;  transform: scale(0.7); }
  50%       { opacity: 1;   transform: scale(1.3); }
}

@keyframes neuron-line-pulse {
  0%, 100% { opacity: 0.08; }
  50%       { opacity: 0.5; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Dot streaming — più cyan, più elettrico */
@keyframes pulse-dot {
  0%, 100% { opacity: 1;   transform: scale(1);    box-shadow: 0 0 4px var(--accent); }
  50%       { opacity: 0.3; transform: scale(0.7);  box-shadow: 0 0 2px transparent; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}

@keyframes chip-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

@keyframes dot-blink {
  0%, 100% { opacity: 0.15; }
  50%       { opacity: 1; }
}

@keyframes chip-fadein {
  from { opacity: 0; transform: translateY(3px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-ring {
  0%   { transform: scale(1);    opacity: 0.6; }
  100% { transform: scale(1.6);  opacity: 0; }
}

@keyframes mem-tab-pulse {
  0%   { transform: scale(1);   opacity: 1;    box-shadow: 0 0 0 0 rgba(59,130,246,0.7); }
  50%  { transform: scale(1.2); opacity: 0.85; box-shadow: 0 0 0 4px rgba(59,130,246,0); }
  100% { transform: scale(1);   opacity: 1;    box-shadow: 0 0 0 0 rgba(59,130,246,0.7); }
}

@keyframes blink-cursor {
  0%, 100% { opacity: 0.8; }
  50%       { opacity: 0; }
}
/* =========================================================
   P42-REPLIT — Replit-style streaming text effect
   - replit-para-reveal : fade-in per nuovi <p> durante streaming
   - replit-chunk-flash : flash cyan al cursore ogni ~22 char
   Zero layout-thrashing: solo opacity (GPU-accelerated)
========================================================= */
@keyframes replit-para-reveal {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Ogni nuovo <p> dentro una card in streaming appare con fade-in */
.chat-card-streaming p,
.chat-card-streaming li {
  animation: replit-para-reveal 0.30s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes replit-chunk-flash {
  0%   { opacity: 0.85; width: 5px; }
  60%  { opacity: 0.25; width: 3px; }
  100% { opacity: 0;    width: 0;   }
}

/* Span effimero — rimontato ogni ~22 char di streaming per dare il pop Replit */
.replit-chunk-glow {
  display: inline-block;
  height: 0.85em;
  width: 0;
  border-radius: 2px;
  background: rgba(0, 212, 255, 0.55);
  vertical-align: middle;
  margin-left: 1px;
  animation: replit-chunk-flash 0.42s ease-out forwards;
  pointer-events: none;
  flex-shrink: 0;
}


/* Shimmer skeleton — più freddo/cyan */
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

/* Glow pulse — input / card attive */
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,0); }
  50%       {
    box-shadow:
      0 0 22px 2px rgba(99,102,241,0.22),
      0 0 8px 0 rgba(0, 212, 255, 0.14);
  }
}

/* Glow breathe — per elementi accent (logo, avatar, dot attivo) */
@keyframes glow-breathe {
  0%, 100% {
    box-shadow: 0 0 4px rgba(0,212,255,0.20), 0 0 12px rgba(99,102,241,0.10);
  }
  50% {
    box-shadow: 0 0 16px rgba(0,212,255,0.55), 0 0 32px rgba(99,102,241,0.25), 0 0 48px rgba(139,92,246,0.12);
  }
}

/* Indigo glow for buttons */
@keyframes indigo-glow-pulse {
  0%, 100% { box-shadow: 0 0 8px rgba(99,102,241,0.25); }
  50%       { box-shadow: 0 0 20px rgba(99,102,241,0.55), 0 0 40px rgba(99,102,241,0.18); }
}

@keyframes avatar-pulse {
  0%, 100% { opacity: 1; filter: drop-shadow(0 0 0 rgba(0, 212, 255, 0)); }
  50%       { opacity: 0.7; filter: drop-shadow(0 0 5px rgba(0, 212, 255, 0.45)); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Scan line futuristica — solo per decorazione leggera su desktop */
@keyframes scan-line {
  0%   { transform: translateY(-100%); opacity: 0; }
  10%  { opacity: 0.025; }
  90%  { opacity: 0.025; }
  100% { transform: translateY(200%); opacity: 0; }
}

/* =========================================================
   PROSE — Markdown (ChatMessage)
========================================================= */
.prose {
  color: var(--text, #e4e4f0);
  font-size: 0.92rem;
  line-height: 1.72;
  word-break: break-word;
  overflow-wrap: anywhere;
}
.prose p { margin-bottom: 1.2rem; }
.prose p:last-child { margin-bottom: 0; }
/* S739: heading typography — erano completamente assenti, titoli Markdown invisibili */
.prose h1, .prose h2, .prose h3, .prose h4 {
  font-weight: 700;
  line-height: 1.3;
  margin-top: 1.5rem;
  margin-bottom: 0.55rem;
  color: var(--text-bright, #f0f0ff);
}
.prose h1:first-child, .prose h2:first-child, .prose h3:first-child { margin-top: 0; }
.prose h1 { font-size: 1.45rem; }
.prose h2 { font-size: 1.22rem; border-bottom: 1px solid rgba(99,102,241,0.18); padding-bottom: 0.2rem; }
.prose h3 { font-size: 1.06rem; }
.prose h4 { font-size: 0.97rem; font-weight: 600; }
/* S739: liste, citazioni, tabelle, link */
.prose ul, .prose ol { padding-left: 1.4rem; margin-bottom: 1rem; }
.prose li { margin-bottom: 0.28rem; }
.prose li > ul, .prose li > ol { margin-bottom: 0; margin-top: 0.2rem; }
.prose blockquote {
  border-left: 3px solid var(--accent, #6366f1);
  padding: 0.1rem 0 0.1rem 0.9rem;
  margin: 1rem 0;
  color: var(--text-muted, #a0a0b8);
  font-style: italic;
}
.prose hr { border: none; border-top: 1px solid var(--border-indigo); margin: 1.4rem 0; }
.prose a { color: #818cf8; text-decoration: underline; text-underline-offset: 2px; }
.prose a:hover { color: #a5b4fc; }
.prose strong { font-weight: 700; color: var(--text-bright, #f0f0ff); }
.prose em { font-style: italic; }
.prose table { width: 100%; border-collapse: collapse; margin-bottom: 1rem; font-size: 0.87em; }
.prose th {
  background: rgba(99,102,241,0.12);
  padding: 0.38rem 0.7rem;
  border: 1px solid var(--border-indigo);
  text-align: left;
  font-weight: 600;
  color: var(--text-bright, #f0f0ff);
}
.prose td { padding: 0.38rem 0.7rem; border: 1px solid rgba(99,102,241,0.12); }
.prose tr:nth-child(even) td { background: rgba(99,102,241,0.04); }
.prose pre {
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.82em;
  background: rgba(8, 8, 20, 0.8);
  border: 1px solid var(--border-indigo);
}
.prose code:not(pre code) {
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
  font-size: 0.85em;
  color: #93c5fd;
  font-family: var(--font-mono);
}

/* =========================================================
   AGENT TIMELINE — AgentStepsPanel
========================================================= */
.agent-step-card {
  border-radius: 10px;
  overflow: hidden;
  transition: border-color var(--transition-normal);
}
.agent-step-card-running {
  border-color: rgba(0, 212, 255, 0.25);
  background: rgba(0, 212, 255, 0.03);
}
.agent-step-card-done {
  border-color: rgba(74, 222, 128, 0.12);
}
.agent-step-card-error {
  border-color: rgba(239, 68, 68, 0.28);
  background: rgba(239, 68, 68, 0.03);
}

/* =========================================================
   INPUT AREA — bottom safe area iOS
========================================================= */
.input-area {
  flex-shrink: 0;
  border-top: 1px solid rgba(99, 102, 241, 0.20);
  box-shadow: 0 -1px 0 0 rgba(0, 212, 255, 0.06), 0 -8px 32px rgba(99,102,241,0.04);
  background: rgba(4, 5, 14, 0.96);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  will-change: transform;    /* GAP-8: compositing layer per backdrop-filter corretto durante scroll */
  padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
}

/* =========================================================
   iOS / SAFARI PERFORMANCE
========================================================= */
/* S243: iOS Safari — DISABLE backdrop-filter (correzione: era un bug che aggiungeva blur invece di rimuoverlo) */
/* S437: aggiunto [aria-live] per AgentLiveBar (che usa backdropFilter inline) */
/* S741: aggiunto .input-area — blur(20px) durante scrolling era il principale bottleneck su iPhone */
.ios .sidebar-desktop,
.ios .glass,
.ios [aria-live]      { backdrop-filter: none !important; -webkit-backdrop-filter: none !important; }
.ios .token-overlay   { backdrop-filter: none !important; -webkit-backdrop-filter: none !important; }
/* S741: .input-area usa blur(20px) — visibile sempre durante scroll → rimosso su iOS */
/* .network-banner light-theme ha blur(14px) ma solo su [data-theme="light"] → impatto minore, invariato */
.ios .chat-input-glass { backdrop-filter: none !important; -webkit-backdrop-filter: none !important; } /* GAP-8: mancava */
.ios .network-banner   { backdrop-filter: none !important; -webkit-backdrop-filter: none !important; } /* GAP-8: mancava */
.ios .input-area      { backdrop-filter: none !important; -webkit-backdrop-filter: none !important;
                        background: rgba(4, 5, 14, 0.99) !important; }

/* =========================================================
   MOBILE
========================================================= */
@media (max-width: 768px) {
  .sidebar-desktop { display: none !important; }
  .main-content { width: 100%; height: var(--vh, 100dvh); }
}

/* =========================================================
   iOS SAFE AREA fallback
========================================================= */
@supports (-webkit-touch-callout: none) {
  .main-content { height: var(--vh, 100dvh); }
}

/* =========================================================
   MOBILE KEYBOARD FIX
========================================================= */
textarea {
  touch-action: manipulation; /* previene zoom doppio tap e migliora risposta iOS */
}
textarea:focus {
  scroll-margin-bottom: 0; /* rimosso: causava scroll jump aggiuntivo su Safari */
  outline: none;
}
.messages-scroll {
  scroll-padding-bottom: 80px;
  overscroll-behavior-y: contain;
}

/* =========================================================
   SUGGESTION CARDS
========================================================= */
.premium-suggestion-card {
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast) !important;
  border: 1px solid rgba(99,102,241,0.14);
  border-radius: var(--radius-md) !important;
}
.premium-suggestion-card:hover {
  border-color: rgba(99,102,241,0.38);
  box-shadow:
    0 0 0 1px rgba(99,102,241,0.12),
    0 0 16px 0 rgba(99,102,241,0.12),
    0 4px 16px rgba(0,0,0,0.28);
  background: rgba(99,102,241,0.06) !important;
}

/* =========================================================
   GPU LAYER HINTS — parsimoniosi
========================================================= */
[style*="pulse-dot"],
[style*="spin-slow"],
[style*="pulse-ring"] {
  will-change: transform, opacity;
}

/* =========================================================
   PREFERS-REDUCED-MOTION — iPhone "Riduci movimento"
========================================================= */
@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;
  }
  @keyframes fadeIn {
    from { opacity: 1; transform: none; }
    to   { opacity: 1; transform: none; }
  }
  @keyframes fadeInUp {
    from { opacity: 1; transform: none; }
    to   { opacity: 1; transform: none; }
  }
  .chat-input-container:focus-within {
    box-shadow: none;
  }
}

/* =========================================================
   DESKTOP ONLY — background depth grid (very subtle)
   Solo su schermi > 768px, non impatta mobile/iPhone
========================================================= */
@media (min-width: 769px) {
  body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(rgba(99, 102, 241, 0.028) 1px, transparent 1px),
      linear-gradient(90deg, rgba(99, 102, 241, 0.028) 1px, transparent 1px);
    background-size: 42px 42px;
    pointer-events: none;
    z-index: 0;
  }
  .app-layout, .main-content, .sidebar-desktop {
    position: relative;
    z-index: 1;
  }
}

/* =========================================================
   MIGLIORIA 1 — Waveform bars TypingIndicator
========================================================= */
@keyframes waveform-bar {
  0%, 100% { transform: scaleY(0.3); opacity: 0.4; }
  50%       { transform: scaleY(1);   opacity: 1; }
}

/* =========================================================
   MIGLIORIA 4 — Cinematic message entrance
========================================================= */
@keyframes message-slide-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   MIGLIORIA 5 — EmptyState logo ring glow pulse
========================================================= */
@keyframes neon-ring-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0,212,255,0), 0 8px 24px rgba(59,130,246,0.12); }
  50%       { box-shadow: 0 0 0 8px rgba(0,212,255,0.06), 0 8px 32px rgba(59,130,246,0.22), 0 0 40px rgba(0,212,255,0.08); }
}

/* Boot flicker — per EmptyState title */
@keyframes boot-flicker {
  0%   { opacity: 0; }
  10%  { opacity: 0.9; }
  12%  { opacity: 0.2; }
  14%  { opacity: 1; }
  100% { opacity: 1; }
}

/* Staggered fade for EmptyState cards */
@keyframes card-enter {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   TEMA CHIARO — S_THEME (light/dark/auto)
   Attivato dalla classe data-theme="light" su <html>
========================================================= */
[data-theme="light"] {
  --bg:          #f2f3fc;
  --bg2:         #e8eaf7;
  --bg3:         #dfe1f4;
  --bg4:         #d5d7ee;
  --bg-surface:  #e4e6f5;

  --border:        rgba(0, 0, 0, 0.08);
  --border-indigo: rgba(99,102,241,0.28);
  --border-cyan:   rgba(0, 150, 200, 0.26);
  --border-glow:   rgba(99, 102, 241, 0.45);

  --text:         #0c0d24;
  --text-muted:   #42446a;
  --text-dim:     #7070a0;

  --primary:       #6366f1;
  --primary-light: #818cf8;
  --primary-dark:  #4f46e5;

  --accent:        #0096c7;
  --accent-dim:    rgba(0, 150, 200, 0.12);
  --accent-glow:   rgba(0, 150, 200, 0.30);

  --glow-indigo:  rgba(99,102,241,0.18);
  --glow-cyan:    rgba(0, 150, 200, 0.14);
  --glow-violet:  rgba(139,92,246,0.15);

  --avatar-primary: #6366f1;
  --avatar-accent:  #0096c7;
  --narration-text: rgba(80, 60, 220, 0.75);

  /* footer button vars — S232 light theme */
  --footer-btn-color: #4a4a6a;
  --footer-btn-bg: rgba(0,0,0,0.04);
  --footer-btn-border: rgba(0,0,0,0.12);

  /* ── Chat message card — light theme ── */
  --card-bg:              rgba(255, 255, 255, 0.90);
  --card-bg-error:        rgba(255, 240, 240, 0.95);
  --card-border-streaming: rgba(0, 150, 200, 0.38);
  --card-border-idle:     rgba(0, 0, 0, 0.10);
  --card-border-error:    rgba(239, 68, 68, 0.32);
  --card-shadow-streaming: 0 0 0 1px rgba(0,150,200,0.12), 0 4px 24px rgba(0,0,0,0.10);
  --card-shadow-idle:     0 2px 12px rgba(0,0,0,0.08);

  /* ── User bubble — light theme ── */
  --user-bubble-bg:     rgba(59,130,246,0.16);
  --user-bubble-text:   #0a1f3d;
  --user-bubble-border: rgba(59,130,246,0.32);
}

/* ── NetworkBanner — light theme overrides (bg più opaco per leggibilità) ── */
[data-theme="light"] .network-banner {
  background: rgba(200, 200, 220, 0.72) !important;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}
[data-theme="light"] .network-banner[data-quality="offline"],
[data-theme="light"] .network-banner[data-quality="poor"] {
  background: rgba(254, 226, 226, 0.85) !important;
}
[data-theme="light"] .network-banner[data-quality="reconnected"] {
  background: rgba(220, 252, 231, 0.85) !important;
}

[data-theme="light"] body {
  background:
    radial-gradient(ellipse at 15% 0%,   rgba(99, 102, 241, 0.10) 0%, transparent 48%),
    radial-gradient(ellipse at 85% 5%,   rgba(139, 92, 246, 0.06) 0%, transparent 42%),
    radial-gradient(ellipse at 50% 100%, rgba(0, 150, 200, 0.07) 0%, transparent 50%),
    #eeeff9;
  color: var(--text);
}

/* ── Glass input bar + sidebar menu — glow edition ── */
.chat-input-glass {
  background: rgba(6, 7, 20, 0.90);
  border: 1px solid rgba(99, 102, 241, 0.22);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow:
    0 -4px 32px rgba(0,0,0,0.38),
    0 -1px 0 rgba(0,212,255,0.06),
    inset 0 1px 0 rgba(255,255,255,0.05);
}
[data-theme="light"] .chat-input-glass {
  background: rgba(242, 244, 255, 0.94);
  border: 1px solid rgba(99,102,241,0.18);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  will-change: transform;    /* GAP-8 */
  box-shadow: 0 -4px 24px rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.9);
}
.sidebar-glass {
  background: rgba(5, 6, 16, 0.96);
  border-right: 1px solid rgba(99,102,241,0.18);
  box-shadow:
    2px 0 40px rgba(0,0,0,0.50),
    inset -1px 0 0 rgba(0,212,255,0.04);
}
[data-theme="light"] .sidebar-glass {
  background: rgba(246, 246, 255, 0.96);
  border-right: 1px solid rgba(99,102,241,0.12);
  box-shadow: 2px 0 18px rgba(0,0,0,0.05);
}
[data-theme="light"] .sidebar-desktop {
  background: rgba(245, 246, 255, 0.96);
  border-right: 1px solid rgba(37, 99, 235, 0.12);
  box-shadow: 2px 0 20px rgba(37,99,235,0.05);
}

/* S313-iOS: keyboard height compensation — set dynamically by ChatInputBar visualViewport */
:root {
  --keyboard-height: 0px;
}

/* =========================================================
   S752-FE — Modern touch: gradient brand + micro-interactions
========================================================= */

/* Agent brand gradient — indigo→cyan, usato nella SidebarHeader */
.agent-brand-gradient {
  background: linear-gradient(90deg,
    var(--primary-light) 0%,
    var(--accent)        65%,
    var(--primary)       100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  letter-spacing: -0.025em;
  will-change: auto;
}

/* Send button active scale — micro-feedback su tap/click */
.send-action-btn:active {
  transform: scale(0.82) !important;
  transition: transform 0.07s ease !important;
}

/* New-chat button pulse on hover (Replit-style) */
.new-chat-btn:hover {
  box-shadow:
    0 0 0 3px rgba(99,102,241,0.18),
    0 6px 20px rgba(99,102,241,0.30) !important;
}
.new-chat-btn:active {
  transform: scale(0.97) !important;
}

/* Conv-row active: indigo left indicator bar */
.conv-row-active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 20%;
  height: 60%;
  width: 2px;
  border-radius: 0 2px 2px 0;
  background: var(--primary);
  opacity: 0.9;
}



/* =========================================================
   GAP-7: Safari Performance Gate — mobile backdrop-filter
   
   backdrop-filter: blur() è MOLTO costoso su iPhone (Safari WebKit):
   - Forza GPU compositing layer su ogni elemento con la proprietà
   - Con molti elementi .glass-card in chat: frame drop visibili su A13 e inferiori
   
   Fix: su max-width 768px (mobile) → disabilita backdrop-filter,
   usa solid background come fallback visivamente accettabile.
   
   ChatMessage.tsx è già wrapped in memo() → nessuna modifica necessaria.
   content-visibility: auto su .chat-message-item già presente (S313-perf).
========================================================= */
@media (max-width: 768px) {
  .glass-card {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: rgba(4, 5, 14, 0.94) !important;
  }
  .glass-surface {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: rgba(6, 8, 22, 0.96) !important;
  }
  .sidebar-desktop {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: rgba(5, 6, 16, 0.97) !important;
  }
  /* Mantieni will-change: transform per GPU compositing — necessario per smooth scroll */
  .sidebar-desktop,
  .glass-card {
    will-change: transform;
  }
}


/* =========================================================
   P43-REPLIT: Typewriter reveal (risposte non-streaming)
   - .replit-typewriter : ogni <p> appare con stagger 50ms
   - .replit-stream-done : flash indigo al completamento streaming
   GPU-safe: solo opacity + transform (compositor-only).
   Rispetta prefers-reduced-motion.
========================================================= */
@keyframes replit-typewriter-reveal {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Stagger per i primi 8 paragrafi, poi tutti a 350ms */
.replit-typewriter p:nth-child(1)    { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1)   0ms both; }
.replit-typewriter p:nth-child(2)    { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1)  55ms both; }
.replit-typewriter p:nth-child(3)    { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1) 110ms both; }
.replit-typewriter p:nth-child(4)    { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1) 165ms both; }
.replit-typewriter p:nth-child(5)    { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1) 220ms both; }
.replit-typewriter p:nth-child(6)    { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1) 275ms both; }
.replit-typewriter p:nth-child(7)    { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1) 330ms both; }
.replit-typewriter p:nth-child(n+8)  { animation: replit-typewriter-reveal 0.32s cubic-bezier(0.16,1,0.3,1) 350ms both; }

/* Liste inline stagger */
.replit-typewriter li:nth-child(1)   { animation: replit-typewriter-reveal 0.28s cubic-bezier(0.16,1,0.3,1)  30ms both; }
.replit-typewriter li:nth-child(2)   { animation: replit-typewriter-reveal 0.28s cubic-bezier(0.16,1,0.3,1)  75ms both; }
.replit-typewriter li:nth-child(3)   { animation: replit-typewriter-reveal 0.28s cubic-bezier(0.16,1,0.3,1) 120ms both; }
.replit-typewriter li:nth-child(4)   { animation: replit-typewriter-reveal 0.28s cubic-bezier(0.16,1,0.3,1) 165ms both; }
.replit-typewriter li:nth-child(n+5) { animation: replit-typewriter-reveal 0.28s cubic-bezier(0.16,1,0.3,1) 200ms both; }

/* Completamento streaming: brightness flash indigo sottile */
@keyframes replit-stream-done {
  0%   { filter: brightness(1) drop-shadow(0 0 0px rgba(129,140,248,0)); }
  20%  { filter: brightness(1.06) drop-shadow(0 0 6px rgba(129,140,248,0.22)); }
  100% { filter: brightness(1) drop-shadow(0 0 0px rgba(129,140,248,0)); }
}
.replit-stream-done {
  animation: replit-stream-done 0.65s ease-out forwards;
}

/* Rispetta prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .replit-typewriter p,
  .replit-typewriter li,
  .replit-stream-done {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
  }
}


/* =========================================================
   UI-MOB1 — Mobile header optimisation
========================================================= */
.chat-header-bar {
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
}
.header-badge-desktop { display: contents; }
@media (max-width: 768px) {
  .chat-header-bar {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }
  .header-badge-desktop { display: none !important; }
}

/* =========================================================
   REPLIT SPLIT LAYOUT — desktop: chat sx, workspace dx
   S-SPLIT: pannelli affiancati sempre visibili su desktop
========================================================= */
.split-chat-pane {
  width: 400px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid rgba(99, 102, 241, 0.18);
  background: rgba(4, 5, 14, 0.97);
}

.split-divider {
  width: 4px;
  flex-shrink: 0;
  cursor: col-resize;
  background: rgba(99, 102, 241, 0.0);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}
.split-divider::after {
  content: "";
  display: block;
  width: 2px;
  height: 48px;
  border-radius: 9px;
  background: rgba(99, 102, 241, 0.28);
  transition: background var(--transition-fast), height var(--transition-fast);
}
.split-divider:hover {
  background: rgba(99, 102, 241, 0.06);
}
.split-divider:hover::after {
  background: rgba(99, 102, 241, 0.55);
  height: 64px;
}

.split-workspace-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}


/* =========================================================
   GAP-4/5: MOTION REDUCTION & MOBILE HOVER OPTIMIZATION
========================================================= */
@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;
  }
  .sidebar-overlay, .sidebar-overlay > div, .glass-card, .message-slide-in,
  .fadeIn, .fadeInUp, .aml-glow, .replit-typewriter *, .replit-stream-done {
    animation: none !important;
  }
}

@media (hover: none) {
  /* Disable hover effects on touch devices to prevent "sticky" hover states */
  .glass-card:hover, .glass-surface:hover, .chat-header-bar:hover {
    box-shadow: var(--shadow-default, none) !important;
    border-color: rgba(255,255,255,0.1) !important;
    transition: none !important;
  }
  button:hover { background: initial !important; }
  .conv-row:hover .conv-menu-btn { opacity: 0.45 !important; }
}

@media (max-width: 768px) {
  .chat-header-bar {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    will-change: auto;
  }
}

/* =========================================================
   GAP-6: TOUCH INTERACTION OPTIMIZATION
========================================================= */
a, button, [role="button"], .clickable {
  touch-action: manipulation; /* Removes 300ms tap delay */
}

.glass-card, .conv-row, .sidebar-item {
  user-select: none; /* Prevents accidental text selection during scroll */
  -webkit-user-select: none;
}

/* Allow selection only in messages and inputs */
.message-content, input, textarea {
  user-select: text !important;
  -webkit-user-select: text !important;
}

/* Performance: content-visibility for off-screen sections */
.admin-panel-content, .settings-content {
  content-visibility: auto;
  contain-intrinsic-size: 0 500px;
}

/* S-MOBILE-ULTRA: iPhone Safari Optimization */
@media (max-width: 768px) {
  /* DOM Flattening: Rimuove ombre e layer complessi su mobile */
  * {
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  /* Semplifica le transizioni per evitare jank */
  .chat-message, .tool-result {
    transition: none !important;
    will-change: auto !important;
  }

  /* Forza il rendering accelerato solo per lo scroll principale */
  .main-content {
    -webkit-overflow-scrolling: touch;
    scroll-behavior: auto; /* Disabilita smooth scroll su mobile per performance */
  }

  /* Lazy Tool Rendering: Nasconde i dettagli dei tool di default su mobile */
  .tool-details {
    display: none;
  }
  .tool-details.expanded {
    display: block;
  }
}

/* =========================================================
   MIGLIORIA 6 — Caret blink animation (GAP-UI-CARET)
========================================================= */
@keyframes caret-blink {
  0%, 70%, 100% { opacity: 1; }
  20%, 50%       { opacity: 0; }
}
.animate-caret-blink {
  animation: caret-blink 1.25s ease-in-out infinite;
}