:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --line: #e3eaf2;
  --line-strong: #d5dfeb;
  --text: #111827;
  --muted: #6b7280;
  --muted-2: #94a3b8;
  --primary: #10a99b;
  --primary-dark: #078277;
  --primary-soft: #e3faf6;
  --danger: #dc2626;
  --shadow: 0 16px 48px rgba(15, 23, 42, .08);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input, select, textarea { font: inherit; }
button { border: 0; }

.app-shell { min-height: 100vh; display: flex; flex-direction: column; }
.topbar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 30;
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; min-width: 0; }
.brand img { width: 44px; height: 44px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 24px rgba(16,169,155,.18); }
.brand strong { display: block; font-size: 18px; line-height: 1.1; }
.brand small { display: block; color: var(--muted); margin-top: 3px; font-size: 12px; }
.top-actions { display: flex; align-items: center; gap: 10px; }

.workspace {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
}
.sidebar, .main-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  min-width: 0;
}
.sidebar {
  padding: 18px;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 104px);
}
.sidebar-backdrop { display: none; }
.sidebar-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.sidebar-head h1 { margin: 0; font-size: 22px; line-height: 1.2; }
.sidebar-head p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
.sidebar-actions { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin-top: 18px; }
.mode-pills { display: flex; gap: 8px; margin: 14px 0; flex-wrap: wrap; }
.mode-pills span {
  display: inline-flex;
  height: 30px;
  align-items: center;
  padding: 0 10px;
  border-radius: 999px;
  color: #334155;
  background: #eef2f7;
  font-size: 12px;
}
.session-list { display: flex; flex-direction: column; gap: 10px; overflow: auto; padding-right: 2px; }
.session-card {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-soft);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px;
  align-items: center;
  gap: 8px;
  padding: 8px;
  transition: border-color .15s, background .15s, transform .15s;
}
.session-card:hover { border-color: var(--primary); transform: translateY(-1px); }
.session-card.active { border-color: #9ee8df; background: var(--primary-soft); }
.session-main {
  min-width: 0;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  padding: 4px;
  text-align: left;
}
.session-main:focus-visible, .session-delete:focus-visible { outline: 3px solid rgba(16,169,155,.22); outline-offset: 2px; }
.session-main strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.session-main span { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.session-delete {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
}
.session-delete:hover { background: #fee2e2; color: var(--danger); }

.main-panel { display: flex; flex-direction: column; min-height: calc(100vh - 104px); overflow: hidden; }
.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
}
.eyebrow { margin: 0 0 6px; color: var(--primary-dark); font-size: 12px; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.panel-head h2 { margin: 0; font-size: 28px; line-height: 1.15; }
.panel-head p:not(.eyebrow) { margin: 7px 0 0; color: var(--muted); }
.summary-tags { display: flex; gap: 8px; justify-content: flex-end; align-content: flex-start; flex-wrap: wrap; max-width: 560px; }
.summary-tags span {
  height: 30px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 10px;
  border-radius: 999px;
  background: #f1f5f9;
  color: #475569;
  font-size: 12px;
  white-space: nowrap;
}

.stage {
  flex: 1;
  min-height: 170px;
  display: grid;
  place-items: center;
  padding: 18px 24px;
  overflow: auto;
}
.empty-state { text-align: center; max-width: 520px; }
.empty-state.loading, .empty-state.error {
  width: min(720px, 100%);
  max-width: 720px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}
.spark {
  width: 62px;
  height: 62px;
  margin: 0 auto 14px;
  border-radius: 22px;
  display: grid;
  place-items: center;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 24px;
}
.spark.loading { animation: pulse 1.1s ease-in-out infinite; }
.spark.error { background: #fee2e2; color: var(--danger); }
.empty-state h3 { margin: 0; font-size: 22px; }
.empty-state p { margin: 8px 0 0; color: var(--muted); line-height: 1.65; }

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(.92); opacity: .62; }
}
.result-grid {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 16px;
}
.result-card {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
}
.result-card img {
  width: 100%;
  height: clamp(240px, 38vh, 430px);
  object-fit: contain;
  display: block;
  background: #fff;
}
.result-actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; padding: 10px; }

.composer-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  padding: 0 24px 24px;
}
.prompt-block, .control-panel {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 18px;
}
.prompt-block { display: flex; flex-direction: column; min-height: 188px; overflow: hidden; }
.prompt-toolbar, .prompt-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-bottom: 1px solid var(--line);
}
.prompt-footer { border-top: 1px solid var(--line); border-bottom: 0; justify-content: space-between; color: var(--muted); font-size: 12px; }
.tool-button {
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: #eef2f7;
  color: #334155;
  cursor: pointer;
}
.tool-button.active { background: var(--primary); color: #fff; }
#referenceBadge { margin-left: auto; color: var(--muted); font-size: 12px; }
textarea {
  flex: 1;
  width: 100%;
  min-height: 92px;
  border: 0;
  resize: none;
  outline: none;
  padding: 14px 16px;
  color: var(--text);
}
.control-panel { padding: 12px; display: flex; flex-direction: column; gap: 10px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field span { color: var(--muted); font-size: 12px; font-weight: 700; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
input, select {
  height: 42px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0 11px;
  outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(16,169,155,.12); }
.secret-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.reference-preview {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  padding: 8px 10px;
  color: var(--muted);
  background: #fbfdff;
}
.reference-preview img { width: 52px; height: 52px; border-radius: 10px; object-fit: cover; }
.control-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.primary-button, .ghost-button, .icon-button {
  min-height: 40px;
  border-radius: 12px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: transform .15s, opacity .15s, background .15s;
}
.primary-button { color: #fff; background: var(--primary); font-weight: 800; }
.primary-button:hover { background: var(--primary-dark); }
.ghost-button { color: #334155; background: #fff; border: 1px solid var(--line); }
.icon-button { width: 40px; padding: 0; color: #334155; background: #fff; border: 1px solid var(--line); }
.primary-button:disabled { opacity: .55; cursor: not-allowed; }
.send-button { width: 100%; min-height: 46px; font-size: 15px; }
.status-line { min-height: 20px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.mobile-only, #closeSidebarBtn { display: none; }
.toast-stack { position: fixed; right: 18px; bottom: 18px; z-index: 80; display: flex; flex-direction: column; gap: 10px; }
.toast {
  max-width: 360px;
  padding: 12px 14px;
  border-radius: 14px;
  color: #0f172a;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.toast.error { border-color: #fecaca; color: #991b1b; }
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(15, 23, 42, .66);
}
.lightbox.open { display: flex; }
.lightbox-panel {
  position: relative;
  width: min(96vw, 1180px);
  max-height: 92vh;
  border-radius: 18px;
  background: #0f172a;
  box-shadow: 0 24px 80px rgba(15, 23, 42, .38);
  overflow: hidden;
}
.lightbox-panel img {
  width: 100%;
  max-height: 92vh;
  display: block;
  object-fit: contain;
}
.lightbox-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  background: rgba(255,255,255,.92);
}

@media (max-width: 1180px) {
  .workspace { grid-template-columns: 300px minmax(0, 1fr); }
  .composer-panel { grid-template-columns: 1fr; }
  .control-panel { order: -1; }
}
@media (max-width: 860px) {
  .topbar { padding: 0 14px; }
  .brand small, .top-actions .ghost-button { display: none; }
  .mobile-only, #closeSidebarBtn { display: inline-flex; }
  .workspace { grid-template-columns: 1fr; padding: 10px; }
  .sidebar {
    position: fixed;
    z-index: 70;
    inset: 0 auto 0 0;
    width: min(88vw, 340px);
    border-radius: 0 20px 20px 0;
    transform: translateX(-105%);
    transition: transform .2s ease;
    min-height: 100vh;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 60;
    background: rgba(15,23,42,.34);
  }
  .sidebar-backdrop.open { display: block; }
  .main-panel { min-height: calc(100vh - 92px); border-radius: 18px; }
  .panel-head { flex-direction: column; padding: 18px; }
  .summary-tags { justify-content: flex-start; }
  .stage { min-height: 300px; padding: 18px; }
  .composer-panel { padding: 0 14px 14px; }
  .field-grid, .control-actions { grid-template-columns: 1fr; }
  .result-grid { max-width: 100%; }
  .result-card img { height: clamp(200px, 30vh, 320px); }
  .result-actions { grid-template-columns: 1fr; }
  .toast-stack { left: 12px; right: 12px; bottom: 12px; }
  .toast { max-width: none; }
  .lightbox { padding: 10px; }
}