/* ═══════════════════════════════════════════════════════════
   Base layout, depth, textures, global chrome
   ═══════════════════════════════════════════════════════════ */

*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  height: 100%;
  height: 100dvh;
  margin: 0;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: calc(16px * var(--font-scale));
  line-height: var(--line);
  color: var(--text);
  overflow: hidden;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* L0 — Deep Space base (Onda 0: gradiente usa tokens, sem cores hardcoded) */
  background-color: var(--space-base);
  background-image: linear-gradient(180deg, var(--space-elevated) 0%, var(--space-base) 55%, var(--elevation-l0) 100%);
  background-attachment: fixed;
  position: relative;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

/* L1 — Mesh ambient orbs (no full-viewport blur) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(ellipse 55vw 50vw at 28% 18%, var(--orb-blue) 0%, transparent 62%),
    radial-gradient(ellipse 48vw 42vw at 88% 78%, var(--orb-cyan) 0%, transparent 60%),
    radial-gradient(ellipse 36vw 30vw at 62% 92%, var(--orb-amber) 0%, transparent 58%);
  background-repeat: no-repeat;
}

/* L3 — Film grain / noise (breaks gradient banding) */
#app::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  mix-blend-mode: overlay;
}

/* ── Hacker: deep space + faint tactical grid (Onda 0: tokens, sem cores hardcoded) ── */
html[data-theme="hacker"] body {
  background-color: var(--space-base);
  background-image:
    linear-gradient(180deg, var(--elevation-l1) 0%, var(--space-base) 50%, var(--elevation-l0) 100%),
    linear-gradient(rgba(255, 158, 44, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 158, 44, 0.025) 1px, transparent 1px);
  background-size: 100% 100%, 32px 32px, 32px 32px;
  background-attachment: fixed;
}

html[data-theme="hacker"] body::before {
  background-image:
    radial-gradient(ellipse 50vw 48vw at 30% 12%, var(--orb-blue) 0%, transparent 65%),
    radial-gradient(ellipse 45vw 40vw at 90% 80%, var(--orb-cyan) 0%, transparent 62%);
}

/* Scanline overlay (hacker FX) — above chrome, below modals */
html[data-theme="hacker"] body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  opacity: calc(var(--scanline) * 0.018);
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.4) 2px,
    rgba(0, 0, 0, 0.4) 4px
  );
  mix-blend-mode: multiply;
}

@media (prefers-reduced-motion: reduce) {
  body::before {
    /* Static mesh — no future drift/parallax */
    transform: none;
    animation: none;
  }
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}
a:hover {
  color: var(--text-strong);
  text-shadow: 0 0 12px var(--accent-glow);
}

#app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
  height: 100dvh;
  height: var(--dynamic-viewport-height, 100dvh);
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  position: relative;
  z-index: 1;
  transition: grid-template-columns var(--transition);
}

/* UI chrome sits above atmosphere layers */
#app > .sidebar,
#app > .main {
  position: relative;
  z-index: 1;
  min-width: 0;
  max-width: 100%;
}

#app.sidebar-collapsed {
  grid-template-columns: 48px 1fr;  /* Onda 0: icon rail mínimo 48px */
}

#app.sidebar-collapsed .sidebar {
  overflow: hidden;
  padding: 0;
}

#app.sidebar-collapsed .sidebar-top,
#app.sidebar-collapsed .sys-status,
#app.sidebar-collapsed .nav-new,
#app.sidebar-collapsed .nav-coder,
#app.sidebar-collapsed .chat-search,
#app.sidebar-collapsed .chat-list,
#app.sidebar-collapsed .sidebar-bottom,
#app.sidebar-collapsed .brand-text {
  display: none;
}

#app.sidebar-collapsed .brand-hit {
  justify-content: center;
  padding: 0.5rem 0;
}

/* Mini logo mark for icon rail */
#app.sidebar-collapsed .brand-mark,
#app.sidebar-collapsed .brand-pulse {
  display: grid;
  margin: 0 auto;
}

#app.sidebar-collapsed .sidebar {
  align-items: center;
  justify-content: flex-start;
}

#app.sidebar-collapsed .sidebar::after {
  content: "P";
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin: 1rem auto;
  color: var(--accent-cyan);
  border: 1px solid var(--border-glow);
  border-radius: 10px;
  font: 700 0.95rem var(--font-mono);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Main column */
.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  max-width: 100%;
  overflow-x: hidden;
  background: transparent;
  position: relative;
}

/* L2 — Vignette anchors focus to center / hero */
.main::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    ellipse 72% 58% at 50% 42%,
    transparent 0%,
    transparent 38%,
    var(--vignette) 100%
  );
  z-index: 0;
  opacity: 0.85;
}

.main > * { position: relative; z-index: 1; }

.stage {
  flex: 1;
  min-height: 0;
  min-width: 0;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-behavior: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-y: contain;
  overflow-anchor: none;
  scroll-padding-bottom: 2rem;
}

.scroll-sentinel { min-height: 1.5rem; }

.scroll-sentinel {
  width: 100%;
  height: 1px;
  flex: 0 0 1px;
  pointer-events: none;
}

html[data-motion="reduced"] *,
html[data-motion="reduced"] *::before,
html[data-motion="reduced"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

html[data-code-wrap="on"] .md-body pre,
html[data-code-wrap="on"] .md-body pre code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.stage-inner {
  width: min(var(--chat-max), 100%);
  max-width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 0.75rem;  /* Onda 0: 24px 24px 12px — 8pt strict */
  box-sizing: border-box;
}

/* Toasts — top-right so never cover composer toggles */
.toast-host {
  position: fixed;
  top: calc(var(--header-h, 56px) + 0.75rem);  /* Onda 0: header 56px */
  right: 1rem;
  left: auto;
  bottom: auto;
  transform: none;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  max-width: min(360px, 88vw);
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: var(--bg-elevated);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow), var(--glow-cyan);
  font-size: 0.9rem;
  animation: rise-in 0.3s ease;
}

.toast.error {
  border-color: color-mix(in srgb, var(--danger) 45%, var(--border));
  color: #fecaca;
  background: rgba(40, 12, 16, 0.85);
  box-shadow: 0 8px 32px rgba(248, 113, 113, 0.12);
}

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

.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.62);
  backdrop-filter: blur(4px) saturate(160%);
  z-index: 40;
  opacity: 0;
  transition: opacity var(--transition);
}

.backdrop.show {
  display: block;
  opacity: 1;
}

@media (max-width: 860px) {
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
  }
  #app > .main {
    grid-row: 1;
    grid-column: 1;
    height: 100%;
    min-height: 100vh;
    min-height: 100dvh;
  }
  #app.sidebar-open .backdrop { display: block; opacity: 1; }
  .stage-inner { padding: 1rem 0.85rem 0.5rem; }
  #composerInput { font-size: 16px; }

  /* Touch targets — 44×44px minimum (FASE 3.3) */
  .msg-actions button,
  .msg-actions .btn-icon,
  #toggleThink,
  #toggleSearch,
  .composer .btn-icon,
  .composer button {
    min-width: 44px;
    min-height: 44px;
    padding: 0.5rem;
  }
}

/* ── Stream badge (smart scroll — FASE 5.2) ── */
.stream-badge {
  position: fixed;
  bottom: 130px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 45;
  min-height: 44px;
  padding: 0.55rem 1.15rem;
  font: inherit;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--accent-cyan);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur, 12px)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--glass-blur, 12px)) saturate(160%);
  border: 1px solid rgba(255, 158, 44, 0.18);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 24px rgba(255, 158, 44, 0.12);
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
  animation: badge-in 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.stream-badge[hidden] {
  display: none;
}
.stream-badge:hover {
  background: rgba(255, 158, 44, 0.08);
}
@keyframes badge-in {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Global focus-visible — accessibility (FASE 4.1) */
button:focus-visible,
input:focus-visible,
a:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: inherit;
}

/* Global reduced-motion — atmosphere (Sprint 4 freeze) */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  /* Hide noise for reduced-motion (FASE 4.2) */
  #app::before {
    opacity: 0 !important;
  }
  body::before {
    transform: none !important;
    animation: none !important;
  }
}
@media (prefers-reduced-transparency: reduce) {
  .sidebar,
  .sources-panel,
  .composer,
  .cc-panel,
  .modal,
  .bubble {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: var(--bg-elevated);
  }
}