:root {
  --sum-accent:      #8b5cf6;
  --sum-accent-2:    #7c3aed;
  --sum-accent-soft: rgba(139, 92, 246, 0.14);
  --sum-accent-line: rgba(139, 92, 246, 0.55);
  --sum-surface:     rgba(255, 255, 255, 0.03);
  --sum-surface-2:   rgba(255, 255, 255, 0.05);
  --sum-border:      rgba(255, 255, 255, 0.08);
  --sum-border-str:  rgba(255, 255, 255, 0.16);
  --sum-text:        rgba(255, 255, 255, 0.88);
  --sum-text-dim:    rgba(255, 255, 255, 0.55);
  --sum-radius:      14px;
}

/* ---------- Shell ---------- */
.sum-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.1rem 1.25rem 3rem;
}
.sum-back {
  color: var(--sum-text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s;
}
.sum-back:hover { color: var(--sum-accent); }

/* ---------- Hero ---------- */
.sum-hero { text-align: center; padding: 1.4rem 0 1.2rem; }
.sum-hero-kicker {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sum-accent);
  margin-bottom: 0.45rem;
}
.sum-hero-title {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  font-weight: 800;
  margin: 0 0 0.5rem;
  background: linear-gradient(135deg, var(--sum-accent), var(--sum-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.sum-hero-sub {
  color: var(--sum-text-dim);
  margin: 0 auto;
  max-width: 600px;
  font-size: 0.96rem;
  line-height: 1.5;
}
.sum-hero-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}
.sum-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.74rem;
  color: var(--sum-text-dim);
  border: 1px solid var(--sum-border);
  background: var(--sum-surface);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
}
.sum-chip-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: linear-gradient(135deg, var(--sum-accent), var(--sum-accent-2));
  box-shadow: 0 0 8px rgba(139, 92, 246, 0.6);
}

/* ---------- Workspace ---------- */
.sum-workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  align-items: start;
}

/* ---------- Panels ---------- */
.sum-panel {
  border: 1px solid var(--sum-border);
  border-radius: var(--sum-radius);
  background:
    radial-gradient(circle at 100% 0%, rgba(139, 92, 246, 0.06), transparent 55%),
    var(--sum-surface);
  display: flex;
  flex-direction: column;
  gap: 0;
}
.sum-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--sum-border);
  gap: 0.5rem;
  flex-wrap: wrap;
}
.sum-panel-head-left {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex: 1;
  min-width: 0;
}
.sum-panel-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--sum-text-dim);
  white-space: nowrap;
}
.sum-panel-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}
.sum-char-count {
  font-size: 0.66rem;
  color: var(--sum-text-dim);
  white-space: nowrap;
}
.sum-char-count.near-limit { color: #fb923c; }
.sum-char-count.at-limit   { color: #ef4444; }

/* ---------- Textarea ---------- */
.sum-textarea {
  width: 100%;
  min-height: 280px;
  padding: 0.85rem;
  box-sizing: border-box;
  background: transparent;
  border: none;
  outline: none;
  color: var(--sum-text);
  font-size: 0.95rem;
  font-family: inherit;
  line-height: 1.65;
  resize: vertical;
  tab-size: 2;
}
.sum-textarea::placeholder { color: rgba(255,255,255,0.22); font-style: italic; }

/* ---------- Stats strip ---------- */
.sum-stats-strip {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.9rem;
  border-top: 1px solid var(--sum-border);
  flex-wrap: wrap;
}
.sum-stat {
  font-size: 0.72rem;
  color: var(--sum-text-dim);
}
.sum-stat-sep { color: rgba(255,255,255,0.2); font-size: 0.7rem; }

/* ---------- Controls ---------- */
.sum-controls {
  padding: 0.75rem 0.9rem 0.9rem;
  border-top: 1px solid var(--sum-border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.sum-control-row {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}
.sum-control-group {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  flex: 1;
  min-width: 120px;
}
.sum-control-label {
  font-size: 0.72rem;
  color: var(--sum-text-dim);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.sum-select {
  padding: 0.42rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--sum-border-str);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  font-size: 0.82rem;
  outline: none;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.sum-select:focus {
  border-color: var(--sum-accent-line);
  box-shadow: 0 0 0 3px var(--sum-accent-soft);
}
.sum-select option { background: #0b1220; }
.sum-select.sum-locked {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ---------- Summarize button ---------- */
.sum-summarize-btn {
  appearance: none;
  width: 100%;
  padding: 0.8rem 1.2rem;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, var(--sum-accent), var(--sum-accent-2));
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.3);
  position: relative;
  overflow: hidden;
}
.sum-summarize-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.07);
  opacity: 0;
  transition: opacity 0.2s;
}
.sum-summarize-btn:hover:not(:disabled)::before { opacity: 1; }
.sum-summarize-btn:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(139, 92, 246, 0.4); }
.sum-summarize-btn:active { transform: translateY(0); }
.sum-summarize-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.sum-summarize-btn.loading { pointer-events: none; }

.sum-shortcut-hint {
  font-size: 0.66rem;
  font-weight: 400;
  opacity: 0.65;
  margin-left: auto;
  background: rgba(0,0,0,0.2);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

/* ---------- Pro badge ---------- */
.sum-pro-badge {
  font-size: 0.55rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  padding: 0.08rem 0.35rem;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--sum-accent), var(--sum-accent-2));
  color: #fff;
  vertical-align: middle;
}

/* ---------- Usage bar ---------- */
.sum-usage-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.5rem 0.9rem;
  border-top: 1px solid var(--sum-border);
}
.sum-usage-label {
  font-size: 0.72rem;
  color: var(--sum-text-dim);
  white-space: nowrap;
}
.sum-usage-track {
  flex: 1;
  height: 5px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}
.sum-usage-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--sum-accent), var(--sum-accent-2));
  transition: width 0.4s;
}

/* ---------- Output area ---------- */
.sum-output {
  flex: 1;
  min-height: 280px;
  padding: 0.9rem;
  position: relative;
  display: flex;
  flex-direction: column;
}
.sum-output-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: 0.5rem;
  text-align: center;
  padding: 2rem 1rem;
  color: rgba(255,255,255,0.22);
}
.sum-placeholder-icon { color: rgba(255,255,255,0.15); }
.sum-output-placeholder p { margin: 0; font-size: 0.92rem; }
.sum-placeholder-hint { font-size: 0.78rem !important; }

.sum-output-text {
  color: var(--sum-text);
  font-size: 0.95rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  flex: 1;
}
.sum-output-text.bullets { white-space: pre-wrap; }

.sum-output-error {
  color: #f87171;
  font-size: 0.9rem;
  line-height: 1.6;
  flex: 1;
}

/* Typing cursor animation */
@keyframes sumBlink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}
.sum-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--sum-accent);
  vertical-align: text-bottom;
  margin-left: 1px;
  animation: sumBlink 0.9s infinite;
  border-radius: 1px;
}

/* ---------- Output stats chips ---------- */
.sum-out-stats {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.sum-stat-chip {
  font-size: 0.62rem;
  font-weight: 600;
  padding: 0.12rem 0.45rem;
  border-radius: 4px;
  background: var(--sum-surface-2);
  border: 1px solid var(--sum-border);
  color: var(--sum-text-dim);
  white-space: nowrap;
}

/* ---------- Skeleton loading ---------- */
@keyframes sumPulse {
  0%, 100% { opacity: 0.3; }
  50%       { opacity: 0.7; }
}
.sum-skeleton {
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.sum-skeleton-line {
  height: 14px;
  border-radius: 6px;
  background: rgba(139, 92, 246, 0.18);
  animation: sumPulse 1.6s ease-in-out infinite;
}
.sum-skeleton-line--long  { width: 92%; }
.sum-skeleton-line--med   { width: 70%; animation-delay: 0.2s; }
.sum-skeleton-line--short { width: 45%; animation-delay: 0.4s; }

/* ---------- History strip ---------- */
.sum-history {
  border-top: 1px solid var(--sum-border);
  padding: 0.6rem 0.9rem 0.75rem;
}
.sum-history-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}
.sum-history-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--sum-text-dim);
}
.sum-history-chips {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.sum-history-chip {
  font-size: 0.72rem;
  color: var(--sum-text-dim);
  background: var(--sum-surface-2);
  border: 1px solid var(--sum-border);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: all 0.18s;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sum-history-chip:hover {
  border-color: var(--sum-accent-line);
  color: #fff;
}

/* ---------- Status bar ---------- */
.sum-status-bar {
  margin-top: 0.65rem;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  font-size: 0.8rem;
  min-height: 2rem;
  display: flex;
  align-items: center;
  transition: background 0.2s;
}
.sum-status-bar:empty { display: none; }
.sum-status-bar.valid   { background: rgba(34, 197, 94, 0.08);  color: #86efac;  border: 1px solid rgba(34, 197, 94, 0.25); }
.sum-status-bar.error   { background: rgba(239, 68, 68, 0.08);  color: #f87171;  border: 1px solid rgba(239, 68, 68, 0.25); }
.sum-status-bar.info    { background: rgba(139, 92, 246, 0.08); color: var(--sum-accent); border: 1px solid var(--sum-accent-line); }

/* ---------- Buttons ---------- */
.sum-btn {
  appearance: none;
  border: 1px solid var(--sum-border-str);
  background: var(--sum-surface-2);
  color: var(--sum-text);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.18s;
  font-family: inherit;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.sum-btn:hover { border-color: var(--sum-accent-line); transform: translateY(-1px); }
.sum-btn-sm  { font-size: 0.72rem; padding: 0.28rem 0.6rem; border-radius: 6px; }
.sum-btn-xs  { font-size: 0.66rem; padding: 0.18rem 0.5rem; border-radius: 5px; }
.sum-btn-ghost { background: transparent; border-color: var(--sum-border); }
.sum-btn.copied { background: rgba(34, 197, 94, 0.15); border-color: rgba(34, 197, 94, 0.4); color: #86efac; }

/* ---------- Toasts ---------- */
.sum-toast-host {
  position: fixed;
  bottom: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9500;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}
.sum-toast {
  pointer-events: auto;
  min-width: 200px;
  max-width: 360px;
  padding: 0.7rem 1rem;
  border-radius: 10px;
  font-size: 0.84rem;
  color: #fff;
  background: rgba(20, 16, 36, 0.97);
  border: 1px solid var(--sum-border-str);
  box-shadow: 0 12px 30px rgba(0,0,0,0.4);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s;
  cursor: pointer;
}
.sum-toast.show    { opacity: 1; transform: translateY(0); }
.sum-toast.success { border-color: rgba(34, 197, 94, 0.5); }
.sum-toast.error   { border-color: rgba(239, 68, 68, 0.5); }
.sum-toast.info    { border-color: var(--sum-accent-line); }

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

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .sum-workspace { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .sum-control-row { gap: 0.45rem; }
  .sum-control-group { min-width: 100px; }
}