/* Lumora Revamp — Balanced glass workspace */

:root {
  --message-width: clamp(760px, 80vw, 1240px);
  --rev-shell-radius: 36px;
  --rev-card-radius: 24px;
  --rev-border: rgba(76, 96, 255, 0.16);
  --rev-border-strong: rgba(76, 96, 255, 0.24);
  --rev-shell-bg: rgba(255, 255, 255, 0.84);
  --rev-panel-bg: rgba(255, 255, 255, 0.9);
  --rev-glass-blur: 28px;
  --rev-shadow: 0 24px 54px rgba(15, 23, 42, 0.14);
  --rev-shadow-soft: 0 16px 38px rgba(15, 23, 42, 0.12);
  --rev-shadow-strong: 0 32px 70px rgba(76, 96, 255, 0.18);
  --hero-card-gradient: linear-gradient(140deg, rgba(89, 134, 255, 0.28), rgba(73, 209, 255, 0.24));
}

html,
body {
  height: 100%;
}

body {
  background: linear-gradient(180deg, #eef3ff 0%, #f9f5ff 70%);
  color: var(--text-1);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

body > .container {
  flex: 1 1 auto;
  min-height: 0;
}

.topbar,
#fiiRoot,
footer.legal {
  flex-shrink: 0;
}

#bg-gradient {
  position: fixed;
  inset: -12% -10% -16% -10%;
  background:
    radial-gradient(38% 38% at 12% 18%, rgba(108, 140, 255, 0.22), transparent 70%),
    radial-gradient(42% 42% at 88% 8%, rgba(64, 196, 255, 0.2), transparent 74%),
    radial-gradient(46% 48% at 82% 82%, rgba(255, 182, 236, 0.16), transparent 80%),
    radial-gradient(48% 50% at 24% 86%, rgba(127, 202, 255, 0.22), transparent 80%),
    linear-gradient(200deg, #f6f8ff 0%, #f9f3ff 60%, #fdf4ff 100%);
  filter: blur(24px) saturate(115%);
  opacity: 0.9;
  z-index: -1;
  animation: revampGradient 32s ease-in-out infinite alternate;
}

@keyframes revampGradient {
  0% { transform: translate3d(0, 0, 0) scale(1.01); }
  50% { transform: translate3d(-1.5%, 2%, 0) scale(1.03); }
  100% { transform: translate3d(1.8%, -1.5%, 0) scale(1.04); }
}

/* ===== Topbar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  padding: calc(18px + env(safe-area-inset-top)) clamp(18px, 4vw, 32px) clamp(12px, 2vw, 18px);
  background: transparent;
  display: flex;
  justify-content: center;
}

.topbar-inner {
  width: min(1200px, 94vw);
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 24px);
  padding: clamp(14px, 2vw, 22px) clamp(20px, 3.2vw, 32px);
  border-radius: 28px;
  background: linear-gradient(160deg, rgba(255,255,255,0.92), rgba(247,249,255,0.78));
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border: 1px solid var(--rev-border);
  box-shadow: var(--rev-shadow);
  position: relative;
}

.topbar-inner::after {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.4);
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.45;
}

.brand-block { gap: 4px; }
.topbar .brand {
  font-size: clamp(22px, 2.6vw, 26px);
  font-weight: 800;
  letter-spacing: 0.2px;
  background: linear-gradient(120deg, var(--brand), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.brand-tagline {
  color: color-mix(in srgb, var(--text-muted) 78%, var(--brand) 22%);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.topbar-right .controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.45), 0 12px 28px rgba(15,23,42,0.08);
}

.topbar-right .controls > * + * { margin-left: 0; }

.select-trigger {
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.12);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.select-trigger:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.18);
}

/* ===== Shell layout ===== */
.container {
  position: relative;
  width: 100%;
  margin: 0;
  padding: clamp(16px, 2vw, 28px) 0;
  grid-template-columns: minmax(260px, 300px) minmax(0, 1fr);
  gap: clamp(12px, 2vw, 24px);
  border-radius: 0;
  background: var(--rev-shell-bg);
  border: none;
  box-shadow: none;
  backdrop-filter: blur(var(--rev-glass-blur));
  -webkit-backdrop-filter: blur(var(--rev-glass-blur));
  overflow: hidden;
  height: 100%;
  min-height: 0;
}

.container::before {
  content: '';
  display: none;
}

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

@media (max-width: 1100px) {
  .container {
    grid-template-columns: minmax(0, 1fr);
    padding: clamp(18px, 4vw, 28px) 0;
    width: 100%;
  }
  html[data-newui="on"] .container.sidebar-collapsed .sidebar {
    width: 100% !important;
  }
}

/* ===== Sidebar ===== */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.8vw, 26px);
  padding: clamp(18px, 2.8vw, 26px);
  background: var(--rev-panel-bg);
  border-radius: calc(var(--rev-card-radius) + 6px);
  border: 1px solid var(--rev-border);
  box-shadow: var(--rev-shadow-soft);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  min-height: 0;
  overflow: hidden;
}

.sidebar-header { display: grid; gap: 12px; }

.sidebar-section {
  background: rgba(255, 255, 255, 0.9);
  border-radius: calc(var(--rev-card-radius) + 4px);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.6);
  padding: 14px 16px;
  display: grid;
  gap: 10px;
}

.sidebar-section.is-actions {
  background: linear-gradient(140deg, rgba(93, 129, 255, 0.14), rgba(244, 247, 255, 0.96));
  border: 1px solid rgba(93, 129, 255, 0.24);
  box-shadow: 0 12px 28px rgba(93, 129, 255, 0.18);
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.sidebar-heading {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(15, 23, 42, 0.62);
}

.sidebar-section.is-actions .sidebar-heading {
  color: rgba(42, 63, 143, 0.85);
}

.sidebar-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-hint {
  margin: 0;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(15, 23, 42, 0.6);
}

.sidebar-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: rgba(15, 23, 42, 0.55);
}

.sidebar-control {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-control input,
.sidebar-control select {
  width: 100%;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.95);
  font-size: 14px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.sidebar-control input:focus,
.sidebar-control select:focus {
  border-color: rgba(93, 129, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(93, 129, 255, 0.18);
  outline: none;
}

.sidebar-header,
.sidebar-footer {
  flex: 0 0 auto;
}

.sidebar-scroll {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.sidebar-scroll .chat-list {
  flex: 1 1 auto;
}

.search-box input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.45);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.search-box input:focus {
  border-color: color-mix(in srgb, var(--brand) 60%, rgba(15, 23, 42, 0.12));
  box-shadow: 0 0 0 4px rgba(93, 129, 255, 0.18);
}

.chat-list {
  background: rgba(255, 255, 255, 0.92);
  border-radius: 18px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  padding: 10px 6px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.45);
  overflow: auto;
  max-height: none;
  flex: 1 1 auto;
  min-height: 0;
}

.chat-list .item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  background: transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  position: relative;
}

.chat-list .item + .item { margin-top: 4px; border-top: none; }

.chat-list .item::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: rgba(93, 129, 255, 0.1);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.chat-list .item:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
}

.chat-list .item:hover::before { opacity: 1; }

.chat-list .item.active {
  background: rgba(93, 129, 255, 0.08);
  border: 1px solid rgba(93, 129, 255, 0.28);
  box-shadow: 0 12px 28px rgba(93, 129, 255, 0.18);
}

.sidebar-footer {
  margin-top: auto;
  padding: 12px 14px;
  border-radius: 18px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.45);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.user-profile { display: flex; gap: 12px; align-items: center; }

.canvas-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.38);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 920;
}

.canvas-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}

.canvas-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: clamp(360px, 34vw, 520px);
  height: 100vh;
  background: rgba(248, 250, 255, 0.98);
  border-left: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: -24px 0 48px rgba(15, 23, 42, 0.16);
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px 24px;
  transform: translateX(100%);
  transition: transform 0.28s ease;
  z-index: 940;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.canvas-panel.open {
  transform: translateX(0);
}

.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.canvas-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.canvas-title {
  font-size: 18px;
  font-weight: 700;
  color: rgba(15, 23, 42, 0.88);
}

.canvas-meta {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(93, 129, 255, 0.18);
  color: rgba(42, 63, 143, 0.88);
}

.canvas-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.canvas-btn {
  background: rgba(15, 23, 42, 0.06);
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 12px;
  padding: 6px 10px;
  font-size: 14px;
  cursor: pointer;
  color: rgba(15, 23, 42, 0.7);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.canvas-btn:hover {
  background: rgba(93, 129, 255, 0.18);
  border-color: rgba(93, 129, 255, 0.4);
  transform: translateY(-1px);
}

.canvas-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  flex: 1 1 auto;
  min-height: 0;
}

.canvas-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.6);
}

.canvas-pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  font-size: 13px;
  font-weight: 600;
  color: rgba(15, 23, 42, 0.6);
}

.canvas-link {
  background: none;
  border: none;
  color: rgba(93, 129, 255, 0.9);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.canvas-link:hover { text-decoration: underline; }

.canvas-pane.editor textarea {
  flex: 1 1 auto;
  width: 100%;
  padding: 16px;
  border: none;
  background: transparent;
  font-family: 'Fira Code', 'SFMono-Regular', SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;
  font-size: 14px;
  line-height: 1.6;
  resize: none;
  outline: none;
  color: rgba(15, 23, 42, 0.88);
}

.canvas-pane.editor textarea::selection {
  background: rgba(93, 129, 255, 0.28);
}

.canvas-preview-area {
  flex: 1 1 auto;
  position: relative;
  overflow: auto;
  padding: 16px 0;
}

.canvas-preview-area iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: #fff;
}

.canvas-preview-area .canvas-markdown,
.canvas-preview-area pre {
  padding: 0 18px 18px 18px;
  margin: 0;
}

.canvas-preview-area .canvas-markdown {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(15, 23, 42, 0.88);
}

.canvas-preview-area pre {
  font-family: 'Fira Code', 'SFMono-Regular', monospace;
  white-space: pre-wrap;
  word-break: break-word;
  color: rgba(15, 23, 42, 0.88);
}

.canvas-warning {
  padding: 18px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(190, 56, 56, 0.9);
}

.canvas-callout {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px dashed rgba(93, 129, 255, 0.5);
  background: rgba(93, 129, 255, 0.1);
  display: grid;
  gap: 8px;
}

.canvas-callout-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(42, 63, 143, 0.86);
}

.canvas-callout-desc {
  font-size: 12px;
  line-height: 1.6;
  color: rgba(15, 23, 42, 0.65);
}

.canvas-open-btn {
  align-self: flex-start;
  border: none;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(120deg, rgba(93, 129, 255, 0.9), rgba(108, 142, 255, 0.82));
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(93, 129, 255, 0.26);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.canvas-open-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(93, 129, 255, 0.32);
}

.canvas-open-btn:focus-visible {
  outline: 2px solid rgba(93, 129, 255, 0.7);
  outline-offset: 2px;
}

@media (max-width: 1080px) {
  .canvas-body {
    grid-template-columns: 1fr;
  }
}
.user-profile .user-name { font-weight: 700; font-size: 14px; }
.avatar-wrap img {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  object-fit: cover;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
}

.proj-chip {
  border-radius: 999px;
  padding: 6px 12px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.92);
  color: color-mix(in srgb, var(--brand) 55%, var(--text-1));
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.proj-chip.active {
  background: rgba(93, 129, 255, 0.12);
  border-color: rgba(93, 129, 255, 0.32);
  box-shadow: 0 14px 32px rgba(93, 129, 255, 0.2);
}

/* ===== Main app layout ===== */
.app {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100%;
  min-height: 0;
  position: relative;
}

#emptyState { grid-row: 1; }
.messages { grid-row: 2; }
.composer { grid-row: 3; }

/* ===== Empty state / hero ===== */
.empty-state {
  max-width: 100%;
  margin: 0;
  padding: clamp(28px, 6vh, 56px) 0 clamp(22px, 5vh, 44px);
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 5vw, 44px);
  min-height: 0;
  max-height: 100%;
  text-align: left;
  overflow-y: auto;
}

.empty-state h1 {
  margin: 0;
  font-size: clamp(42px, 6.4vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  background: linear-gradient(110deg, #5b7bff 0%, #38d6ff 55%, #9b7bff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.empty-state p {
  margin: 0;
  font-size: clamp(18px, 2.6vw, 24px);
  line-height: 1.7;
  color: color-mix(in srgb, var(--text-muted) 72%, var(--brand) 24%);
}

.hero-frame {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3.6vw, 32px);
  width: 100%;
  align-items: stretch;
}

.hero-main {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3.4vw, 32px);
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: 0;
  border: none;
  background: transparent;
  box-shadow: none;
  overflow: visible;
  width: 100%;
  /* bleed to cover the empty-state's horizontal padding (now 0, kept for safety) */
  margin-inline: 0;
}

.hero-main::after { content: none; }

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

.hero-greeting {
  display: grid;
  gap: 6px;
}

.hero-greeting p {
  font-size: clamp(20px, 3vw, 26px);
  color: color-mix(in srgb, var(--text-muted) 60%, var(--brand) 30%);
}

.hero-input {
  display: grid;
  grid-template-columns: 60px 1fr 52px 60px;
  gap: clamp(16px, 2.4vw, 22px);
  align-items: center;
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: 20px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 44px rgba(15, 23, 42, 0.12);
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
  width: 100%;
}

.hero-input:focus-within {
  border-color: rgba(93, 129, 255, 0.4);
  box-shadow: 0 0 0 4px rgba(93, 129, 255, 0.2), 0 24px 60px rgba(15, 23, 42, 0.16);
}

.hero-input input {
  font-size: clamp(17px, 2.2vw, 20px);
  border: none;
  background: transparent;
  color: var(--text-1);
  padding: 0 12px;
}

.hero-input input::placeholder {
  color: color-mix(in srgb, var(--text-muted) 75%, var(--brand) 20%);
}

.hero-input .sb-btn,
.hero-input .sb-icon,
.hero-input .sb-send {
  display: grid;
  place-items: center;
  border-radius: 16px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.12);
  width: clamp(52px, 4.6vw, 60px);
  height: clamp(52px, 4.6vw, 60px);
}

.hero-input .sb-send {
  background: linear-gradient(135deg, #5b7bff, #38d6ff);
  border: none;
  color: white;
  font-weight: 600;
  box-shadow: 0 20px 44px rgba(91, 123, 255, 0.28);
}

.hero-hints {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  width: 100%;
}

.hero-hint {
  appearance: none;
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.1);
  background: rgba(255, 255, 255, 0.9);
  padding: 12px 20px;
  font-weight: 600;
  font-size: 14px;
  color: color-mix(in srgb, var(--brand) 60%, var(--text-1));
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.12);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hero-hint:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(15,23,42,0.14); }

.hero-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(16px, 3vw, 28px);
  width: 100%;
}

.hero-card {
  padding: clamp(24px, 3.4vw, 34px);
  border-radius: var(--rev-card-radius);
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--rev-shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: 100%;
}

.hero-card h3 { margin: 0; font-size: 18px; font-weight: 700; }
.hero-card p { margin: 0; font-size: 15px; color: color-mix(in srgb, var(--text-muted) 78%, var(--brand) 20%); line-height: 1.65; }

.hero-card.gradient {
  background: var(--hero-card-gradient);
  color: white;
  border-color: rgba(255,255,255,0.38);
  box-shadow: var(--rev-shadow-strong);
}

.hero-card.gradient h3,
.hero-card.gradient p { color: rgba(255,255,255,0.92); }

.hero-card.gradient .shortcut-pill {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.45);
  color: rgba(255,255,255,0.95);
}

.hero-shortcuts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-blueprints {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.shortcut-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.18);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: white;
}

.hero-card-btn {
  appearance: none;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.92);
  border-radius: 18px;
  padding: 16px 20px;
  text-align: left;
  font-weight: 600;
  font-size: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  width: 100%;
  box-shadow: 0 14px 34px rgba(15,23,42,0.12);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.hero-card-btn::after { content: '→'; opacity: 0.4; font-size: 18px; }
.hero-card-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(93, 129, 255, 0.32);
  box-shadow: 0 20px 48px rgba(15, 23, 42, 0.16);
}

.purpose-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(18px, 3.6vw, 32px);
}

.purpose-column {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--rev-card-radius);
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--rev-shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.purpose-column h3 {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--brand) 65%, var(--text-1));
}

.chip-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chip-stack .chip {
  justify-content: space-between;
  width: 100%;
  border-radius: 16px;
  padding: 10px 14px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(15, 23, 42, 0.08);
  color: color-mix(in srgb, var(--brand) 60%, var(--text-1));
  box-shadow: 0 12px 30px rgba(15,23,42,0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.chip-stack .chip:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 44px rgba(15,23,42,0.14);
}

/* ===== Conversation canvas ===== */
.messages {
  display: flex !important;
  flex-direction: column;
  gap: clamp(16px, 3vw, 32px);
  padding: clamp(24px, 4.6vw, 42px) clamp(22px, 3.8vw, 48px) clamp(96px, 10vh, 140px);
  align-items: stretch;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.messages > * { width: 100%; }

.bubble {
  position: relative;
  display: grid;
  grid-template-columns: clamp(44px, 3.6vw, 52px) minmax(0, 1fr);
  gap: clamp(12px, 2.8vw, 24px);
  padding: clamp(4px, 1vw, 12px);
  max-width: var(--message-width);
  margin: 0 auto;
}

.bubble.user {
  grid-template-columns: minmax(0, 1fr) clamp(44px, 3.6vw, 52px);
}

.bubble.user .avatar { order: 2; }
.bubble.user .bubble-main { order: 1; align-items: flex-end; }

.avatar {
  width: clamp(44px, 3.6vw, 52px);
  height: clamp(44px, 3.6vw, 52px);
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 15px;
  color: white;
  background: linear-gradient(135deg, #5b7bff 0%, #38d6ff 100%);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 18px 44px rgba(15,23,42,0.16);
  overflow: hidden;
}

.avatar.user {
  background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(214,218,255,0.95));
  color: color-mix(in srgb, var(--brand) 60%, var(--text-1));
  border: 1px solid rgba(93, 129, 255, 0.32);
}

.bubble-main {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2.6vw, 20px);
  align-items: flex-start;
}

.bubble .content {
  position: relative;
  padding: clamp(18px, 3vw, 26px);
  border-radius: clamp(22px, 4vw, 30px);
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 26px 64px rgba(15, 23, 42, 0.14);
  color: var(--text-1);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.bubble .content::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.45);
  opacity: 0.55;
  pointer-events: none;
}

.bubble .content:hover {
  transform: translateY(-2px);
  box-shadow: 0 32px 82px rgba(15, 23, 42, 0.16);
}

.bubble.user .content {
  background: linear-gradient(155deg, rgba(91, 123, 255, 0.95), rgba(56, 214, 255, 0.86));
  border: 1px solid rgba(255,255,255,0.4);
  color: rgba(255,255,255,0.98);
  box-shadow: 0 32px 78px rgba(56, 101, 255, 0.32);
}

.bubble.user .content a { color: rgba(255,255,255,0.95); text-decoration: underline; }

.bubble.user .content code {
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.26);
  color: inherit;
}

.bubble .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--text-muted) 80%, var(--brand) 20%);
}

.bubble.user .meta { justify-content: flex-end; color: rgba(255,255,255,0.72); }

.bubble .meta .model,
.bubble .meta .trust,
.bubble .meta .confidence {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.92);
  font-weight: 600;
}

.bubble.user .meta .model,
.bubble.user .meta .trust,
.bubble.user .meta .confidence {
  border-color: rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.18);
}

.bubble .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.bubble-main:hover .actions,
.bubble-main:focus-within .actions {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.94);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: color-mix(in srgb, var(--brand) 58%, var(--text-1));
  transition: transform 0.18s ease, box-shadow 0.2s ease;
}

.action-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.16);
}

/* Code surfaces */
.code-block {
  border-radius: clamp(18px, 3vw, 24px);
  border: 1px solid rgba(12, 18, 44, 0.4);
  background: rgba(12, 16, 36, 0.94);
  box-shadow: 0 30px 60px rgba(12, 18, 44, 0.6);
  overflow: hidden;
}

.code-block pre { background: transparent; color: #f8fbff; }

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  background: linear-gradient(120deg, rgba(93,129,255,0.32), rgba(73,209,255,0.24));
  color: rgba(255,255,255,0.92);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 700;
}

.code-copy {
  appearance: none;
  border: 1px solid rgba(255,255,255,0.45);
  background: rgba(255,255,255,0.18);
  color: inherit;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 11px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.code-copy:hover { background: rgba(255,255,255,0.28); transform: translateY(-1px); }

/* ===== Composer ===== */
.composer {
  position: sticky;
  bottom: 0;
  z-index: 20;
  width: 100%;
  max-width: none;
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  --composer-pad: clamp(16px, 3vw, 24px);
  padding: var(--composer-pad);
  padding-bottom: calc(var(--composer-pad) + env(safe-area-inset-bottom));
  border-radius: 0;
  border: none;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: none;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.composer textarea {
  width: 100%;
  resize: none;
  border: none;
  background: transparent;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-1);
  padding: 0 4px;
  min-height: 72px;
  max-height: 340px;
}

.composer textarea::placeholder {
  color: color-mix(in srgb, var(--text-muted) 75%, var(--brand) 20%);
}

.composer .icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 16px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.12);
  display: grid;
  place-items: center;
  color: color-mix(in srgb, var(--brand) 60%, var(--text-1));
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.composer .icon-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.18);
}

.composer .composer-attach-bar {
  grid-column: 1 / -1;
  display: none;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin: 0 0 8px;
}
.composer .composer-attach-bar:not([hidden]) { display: flex; }
.composer .composer-attach-bar .attach-chip {
  position: relative;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 16px 38px rgba(15, 23, 42, 0.18);
  background: linear-gradient(135deg, rgba(91,123,255,0.18), rgba(56,214,255,0.18));
}
.composer .composer-attach-bar .attach-chip .tools button {
  background: rgba(15, 23, 42, 0.9);
  color: white;
}

.composer .composer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.composer .send-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, #5b7bff, #38d6ff);
  color: white;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  box-shadow: 0 26px 60px rgba(91,123,255,0.3);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.composer .send-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 32px 72px rgba(91,123,255,0.32);
}

#charCount {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--text-muted) 70%, var(--brand) 22%);
}

#charCount.warn { color: color-mix(in srgb, var(--brand) 80%, white 20%); }

.hero-menu,
.submenu {
  border-radius: 18px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 24px 64px rgba(15, 23, 42, 0.2);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.menu-heading {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(15, 23, 42, 0.55);
  padding: 6px 16px 2px;
}

.menu-check {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  font-size: 13px;
  color: rgba(15, 23, 42, 0.74);
}

.menu-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: rgba(93, 129, 255, 0.85);
}

.menu-radio-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 4px 16px 12px;
}

.menu-radio-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(15, 23, 42, 0.7);
}

.menu-radio-group input[type="radio"] {
  accent-color: rgba(93, 129, 255, 0.85);
}

.hero-menu::before,
.submenu::before { display: none; }

.mp-suggest-row {
  grid-column: 1 / -1;
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: clamp(6px, 2vw, 12px);
}

.mp-suggest-bubble {
  border-radius: 999px;
  padding: 10px 16px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 38px rgba(15, 23, 42, 0.14);
  font-size: 13px;
  font-weight: 600;
  color: color-mix(in srgb, var(--brand) 60%, var(--text-1));
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.mp-suggest-bubble:hover { transform: translateY(-2px); box-shadow: 0 24px 56px rgba(15, 23, 42, 0.16); }

.mp-suggest-bubble.mp-nudge {
  background: rgba(93, 129, 255, 0.14);
  border-color: rgba(93, 129, 255, 0.28);
}

.scroll-bottom {
  position: fixed;
  left: 50%;
  right: auto;
  bottom: calc(32px + env(safe-area-inset-bottom));
  transform: translate(-50%, 12px);
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 18px 46px rgba(15, 23, 42, 0.18);
  color: color-mix(in srgb, var(--brand) 62%, var(--text-1));
  z-index: 30;
}
.scroll-bottom.show { transform: translate(-50%, 0); }

.plan-badge {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 999px;
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12);
  letter-spacing: 0.08em;
}

/* ===== Dark theme adjustments ===== */
html[data-theme="dark"] body { background: radial-gradient(circle at 20% 20%, #0f172a, #030712 75%); }

html[data-theme="dark"] #bg-gradient {
  background:
    radial-gradient(42% 40% at 20% 16%, rgba(59, 130, 246, 0.28), transparent 70%),
    radial-gradient(40% 40% at 82% 12%, rgba(14, 165, 233, 0.24), transparent 72%),
    radial-gradient(48% 48% at 78% 78%, rgba(124, 58, 237, 0.22), transparent 78%),
    linear-gradient(200deg, #050a1a 0%, #030413 60%, #02030c 100%);
  filter: blur(26px) saturate(130%);
  opacity: 0.82;
}

html[data-theme="dark"] .topbar-inner {
  background: linear-gradient(170deg, rgba(12, 18, 36, 0.92), rgba(8, 12, 28, 0.86));
  border-color: rgba(93, 129, 255, 0.28);
  box-shadow: 0 18px 48px rgba(3, 6, 18, 0.7);
}

html[data-theme="dark"] .topbar-inner::after { border-color: rgba(93, 129, 255, 0.32); opacity: 0.35; }
html[data-theme="dark"] .brand-tagline { color: color-mix(in srgb, rgba(148, 163, 255, 0.88) 70%, white 30%); }
html[data-theme="dark"] .topbar-right .controls {
  background: rgba(17, 24, 48, 0.92);
  border-color: rgba(93, 129, 255, 0.28);
  box-shadow: inset 0 1px 0 rgba(93,129,255,0.18), 0 12px 32px rgba(2,6,18,0.6);
}

html[data-theme="dark"] .select-trigger {
  background: rgba(12, 18, 36, 0.96);
  border-color: rgba(93, 129, 255, 0.32);
  box-shadow: 0 14px 36px rgba(3, 6, 18, 0.7);
}

html[data-theme="dark"] .container {
  background: rgba(8, 12, 28, 0.92);
  border-color: rgba(93, 129, 255, 0.28);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.6);
}

html[data-theme="dark"] .container::before {
  background: linear-gradient(135deg, rgba(93, 129, 255, 0.32), rgba(56, 214, 255, 0.24));
  opacity: 0.45;
}

html[data-theme="dark"] .sidebar,
html[data-theme="dark"] .sidebar-footer,
html[data-theme="dark"] .chat-list,
html[data-theme="dark"] .purpose-column,
html[data-theme="dark"] .hero-card,
html[data-theme="dark"] .hero-main,
html[data-theme="dark"] .hero-input,
html[data-theme="dark"] .empty-state,
html[data-theme="dark"] .composer,
html[data-theme="dark"] .plan-badge,
html[data-theme="dark"] .mp-suggest-bubble {
  background: rgba(12, 18, 36, 0.92);
  border-color: rgba(93, 129, 255, 0.26);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
}

html[data-theme="dark"] .search-box input,
html[data-theme="dark"] .hero-card-btn,
html[data-theme="dark"] .chat-list .item,
html[data-theme="dark"] .chip-stack .chip,
html[data-theme="dark"] .hero-hint,
html[data-theme="dark"] .composer .icon-btn,
html[data-theme="dark"] .mp-suggest-bubble {
  background: rgba(16, 24, 44, 0.88);
  border-color: rgba(93, 129, 255, 0.28);
  color: color-mix(in srgb, rgba(200, 210, 255, 0.92) 70%, white 30%);
}

html[data-theme="dark"] .hero-card.gradient {
  background: linear-gradient(140deg, rgba(93, 129, 255, 0.45), rgba(73, 209, 255, 0.32));
  border-color: rgba(255,255,255,0.28);
}

html[data-theme="dark"] .chat-list .item:hover { box-shadow: 0 16px 40px rgba(0,0,0,0.45); }
html[data-theme="dark"] .chat-list .item.active { border-color: rgba(93, 129, 255, 0.4); background: rgba(93, 129, 255, 0.2); }

html[data-theme="dark"] .bubble .content {
  background: rgba(16, 24, 44, 0.96);
  border-color: rgba(93, 129, 255, 0.28);
  color: rgba(221, 230, 255, 0.92);
}

html[data-theme="dark"] .bubble .content::after { border-color: rgba(93, 129, 255, 0.24); }

html[data-theme="dark"] .bubble.user .content {
  background: linear-gradient(150deg, rgba(93, 129, 255, 0.95), rgba(73, 209, 255, 0.78));
  border-color: rgba(255,255,255,0.3);
}

html[data-theme="dark"] .bubble .meta { color: color-mix(in srgb, rgba(170, 184, 255, 0.85) 70%, white 30%); }

html[data-theme="dark"] .action-btn,
html[data-theme="dark"] .scroll-bottom {
  background: rgba(16, 24, 44, 0.88);
  border-color: rgba(93, 129, 255, 0.26);
  color: color-mix(in srgb, rgba(180, 196, 255, 0.9) 70%, white 30%);
}

html[data-theme="dark"] .composer .send-btn { box-shadow: 0 32px 72px rgba(36, 64, 200, 0.5); }

html[data-theme="dark"] .canvas-backdrop { background: rgba(5, 10, 20, 0.68); }
html[data-theme="dark"] .canvas-panel {
  background: rgba(13, 18, 32, 0.96);
  border-left-color: rgba(255, 255, 255, 0.06);
  box-shadow: -24px 0 48px rgba(0, 0, 0, 0.78);
}
html[data-theme="dark"] .canvas-btn {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.16);
  color: rgba(210, 220, 255, 0.88);
}
html[data-theme="dark"] .canvas-pane {
  background: rgba(18, 26, 42, 0.95);
  border-color: rgba(255, 255, 255, 0.06);
}
html[data-theme="dark"] .canvas-pane.editor textarea {
  color: rgba(222, 230, 255, 0.92);
}
html[data-theme="dark"] .canvas-preview-area pre,
html[data-theme="dark"] .canvas-preview-area .canvas-markdown {
  color: rgba(218, 228, 255, 0.9);
}
html[data-theme="dark"] .canvas-callout {
  border-color: rgba(124, 158, 255, 0.56);
  background: rgba(66, 104, 236, 0.24);
}
html[data-theme="dark"] .canvas-callout-title { color: rgba(195, 208, 255, 0.92); }
html[data-theme="dark"] .canvas-callout-desc { color: rgba(205, 214, 255, 0.8); }

/* ===== Responsive adjustments ===== */
@media (max-width: 1280px) {
  .topbar-inner { width: min(1140px, 96vw); }
  .container { width: 100%; }
}

@media (max-width: 960px) {
  .topbar-inner { flex-direction: column; align-items: stretch; }
  .topbar-right { width: 100%; justify-content: space-between; }
  .hero-frame { gap: clamp(18px, 5vw, 28px); }
  .hero-info-grid { grid-template-columns: minmax(0, 1fr); }
  .container { gap: clamp(18px, 4vw, 28px); }
}

@media (max-width: 760px) {
  .container { padding: clamp(12px, 4vw, 20px) 0; border-radius: 0; }
  .sidebar { padding: 18px; border-radius: 20px; }
  .empty-state { padding: clamp(24px, 8vw, 36px) clamp(10px, 3.5vw, 16px); }
  .messages { padding: clamp(24px, 10vw, 44px) clamp(16px, 6vw, 24px) clamp(100px, 16vh, 140px); }
  .composer {
    grid-template-columns: 44px 1fr 44px;
    --composer-pad: clamp(14px, 5vw, 22px);
    padding: var(--composer-pad);
    padding-bottom: calc(var(--composer-pad) + env(safe-area-inset-bottom));
    border-radius: 22px;
  }
  .composer .send-btn { padding: 10px 20px; }
  .scroll-bottom { bottom: calc(24px + env(safe-area-inset-bottom)); }
}

@media (max-width: 540px) {
  .topbar { padding-left: 12px; padding-right: 12px; }
  .topbar-inner { border-radius: 22px; }
  .container { margin: clamp(12px, 4vh, 24px) 12px clamp(24px, 6vh, 48px); }
  .hero-input { grid-template-columns: 40px 1fr 44px; }
  .hero-input .sb-send { grid-column: span 3; justify-self: stretch; }
  .composer {
    grid-template-columns: 1fr;
    --composer-pad: clamp(16px, 6vw, 24px);
    padding: var(--composer-pad);
    padding-bottom: calc(var(--composer-pad) + env(safe-area-inset-bottom));
  }
  .composer textarea { min-height: 120px; }
  .composer .icon-btn,
  .composer .send-btn { width: 100%; }
  .composer .send-btn { justify-content: center; }
  .scroll-bottom { bottom: calc(18px + env(safe-area-inset-bottom)); }
}