/* ═══════════════════════════════════════════════════════════════
   ESAT Engine — Professional styles using brand design tokens
   ═══════════════════════════════════════════════════════════════ */

.engine-page {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

/* ── Breadcrumb ───────────────────────────────────────────────── */
.engine-breadcrumb {
  font-size: .8rem;
  color: var(--color-text-medium);
  margin-bottom: 24px;
}
.engine-breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}
.engine-breadcrumb a:hover { text-decoration: underline; }
.engine-breadcrumb-sep {
  margin: 0 6px;
  color: var(--color-border);
}

/* ── Hero ─────────────────────────────────────────────────────── */
.engine-hero {
  margin-bottom: 28px;
}
.engine-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(92, 107, 192, 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(92, 107, 192, 0.2);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 14px;
}
.engine-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  color: var(--color-text-dark);
  margin: 0 0 10px;
}
.engine-sub {
  color: var(--color-text-medium);
  font-size: .93rem;
  max-width: 520px;
  line-height: 1.65;
  margin: 0;
}

/* ── Login gate ───────────────────────────────────────────────── */
.engine-login-gate {
  text-align: center;
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 48px 32px;
  margin-bottom: 32px;
}
.engine-gate-icon {
  width: 52px;
  height: 52px;
  background: rgba(92, 107, 192, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--color-primary);
  font-size: 1.3rem;
}
.engine-gate-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 8px;
}
.engine-gate-sub {
  color: var(--color-text-medium);
  font-size: .9rem;
  margin-bottom: 24px;
  line-height: 1.6;
}
.engine-gate-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Usage meter ──────────────────────────────────────────────── */
.engine-usage-bar {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 14px 18px;
  margin-bottom: 16px;
}
.engine-usage-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .78rem;
  font-weight: 600;
  color: var(--color-text-medium);
  margin-bottom: 8px;
}
.engine-usage-track {
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 8px;
}
.engine-usage-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 2px;
  transition: width .4s ease;
}
.engine-usage-fill.at-limit { background: var(--color-error); }
.engine-usage-remaining {
  font-size: .74rem;
  color: var(--color-text-medium);
}
.engine-usage-limit-msg {
  font-size: .74rem;
  color: var(--color-error);
  font-weight: 600;
}
.engine-usage-upgrade {
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: none;
}
.engine-usage-upgrade:hover { text-decoration: underline; }
.engine-premium-pill {
  font-size: .68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(92, 107, 192, 0.1);
  color: var(--color-primary);
  margin-left: 6px;
}

/* ── Input panel ──────────────────────────────────────────────── */
.engine-input-panel {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 20px;
  margin-bottom: 16px;
}

/* ── Drop zone ────────────────────────────────────────────────── */
.engine-drop-zone {
  border: 1.5px dashed var(--color-border);
  border-radius: var(--border-radius);
  min-height: 140px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: border-color var(--transition-speed), background var(--transition-speed);
  background: var(--color-background);
  margin-bottom: 14px;
  overflow: hidden;
}
.engine-drop-zone:hover,
.engine-drop-zone.drag-over {
  border-color: var(--color-primary);
  background: rgba(92, 107, 192, 0.04);
}
.engine-drop-placeholder {
  text-align: center;
  padding: 20px;
  pointer-events: none;
}
.engine-drop-icon {
  font-size: 1.6rem;
  color: var(--color-text-medium);
  margin-bottom: 10px;
  opacity: .6;
}
.engine-drop-title {
  font-weight: 600;
  font-size: .88rem;
  color: var(--color-text-dark);
  margin-bottom: 5px;
}
.engine-drop-hint {
  font-size: .78rem;
  color: var(--color-text-medium);
}
.engine-drop-hint kbd {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: .73rem;
  font-family: inherit;
  color: var(--color-text-medium);
}
.engine-image-preview {
  max-width: 100%;
  max-height: 320px;
  border-radius: var(--border-radius);
  display: block;
  margin: 0 auto;
}
.engine-clear-image-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, .5);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 5px 10px;
  font-size: .75rem;
  font-weight: 600;
  cursor: pointer;
  z-index: 2;
  transition: background var(--transition-speed);
}
.engine-clear-image-btn:hover { background: var(--color-error); }

/* ── Text area details ────────────────────────────────────────── */
.engine-text-details { margin-bottom: 14px; }
.engine-text-details summary {
  font-size: .8rem;
  font-weight: 600;
  color: var(--color-text-medium);
  cursor: pointer;
  user-select: none;
  padding: 4px 0;
  list-style: none;
}
.engine-text-details summary::-webkit-details-marker { display: none; }
.engine-text-details summary::before { content: '+ '; }
.engine-text-details[open] summary::before { content: '− '; }

.engine-textarea {
  width: 100%;
  min-height: 90px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 10px 14px;
  font-size: .9rem;
  line-height: 1.6;
  font-family: inherit;
  resize: vertical;
  background: var(--color-background);
  color: var(--color-text-dark);
  box-sizing: border-box;
  transition: border-color var(--transition-speed);
  margin-top: 8px;
}
.engine-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(92, 107, 192, 0.1);
}

/* ── Actions row ──────────────────────────────────────────────── */
.engine-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}
.engine-solve-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--border-radius);
  padding: 10px 22px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition-speed), opacity var(--transition-speed);
}
.engine-solve-btn:hover { background: var(--color-primary-hover, #4A5BAA); }
.engine-solve-btn:disabled { opacity: .45; cursor: not-allowed; }
.engine-hint {
  font-size: .75rem;
  color: var(--color-text-medium);
}

/* ── Shortcuts bar ────────────────────────────────────────────── */
.engine-shortcuts-bar {
  display: none;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  align-items: center;
}
.engine-shortcuts-bar.visible { display: flex; }
.engine-chips-label {
  font-size: .73rem;
  font-weight: 600;
  color: var(--color-text-medium);
  flex-shrink: 0;
}
.engine-shortcut-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border-radius: 20px;
  padding: 4px 10px;
  font-size: .76rem;
  font-weight: 600;
  border: 1px solid;
}
.engine-shortcut-chip .chip-score {
  border-radius: 10px;
  padding: 1px 4px;
  font-size: .68rem;
  background: rgba(0,0,0,.07);
}

/* ── Output panel ─────────────────────────────────────────────── */
.engine-output {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 20px;
  margin-bottom: 16px;
}
.engine-output-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}
.engine-output-icon {
  width: 32px;
  height: 32px;
  background: rgba(92, 107, 192, 0.1);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: .9rem;
  flex-shrink: 0;
}
.engine-output-title {
  font-weight: 700;
  font-size: .92rem;
  color: var(--color-text-dark);
}
.engine-output-sub {
  font-size: .75rem;
  color: var(--color-text-medium);
}

/* ── Thinking animation ───────────────────────────────────────── */
.engine-thinking {
  padding: 24px 0 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.engine-thinking-bar {
  width: 100%;
  height: 2px;
  border-radius: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-primary) 40%,
    rgba(92, 107, 192, 0.4) 60%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: thinking-slide 1.8s ease-in-out infinite;
}
@keyframes thinking-slide {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.engine-thinking-text {
  font-size: .8rem;
  color: var(--color-text-medium);
  animation: thinking-pulse 2.2s ease-in-out infinite;
  text-align: center;
}
@keyframes thinking-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: .4; }
}

/* ── Solution stream (hidden — silently accumulates) ──────────── */
.engine-solution-stream { display: none; }

/* ── Section cards ────────────────────────────────────────────── */
.engine-solution-cards {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.engine-card {
  border-left: 3px solid;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  padding: 14px 16px;
  background: var(--color-card-background);
}
.engine-card-tag {
  display: block;
  font-size: .64rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: 6px;
  white-space: nowrap;
  line-height: 1;
}
.engine-card-tag i {
  margin-right: 4px;
}
.engine-card-headline {
  font-size: .97rem;
  font-weight: 700;
  color: var(--color-text-dark);
  line-height: 1.45;
}
.engine-card-body {
  font-size: .88rem;
  line-height: 1.85;
  color: var(--color-text-dark);
  white-space: pre-wrap;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(0, 0, 0, .05);
}
.engine-fallback {
  font-size: .9rem;
  line-height: 1.8;
  color: var(--color-text-dark);
  white-space: pre-wrap;
  padding: 4px 0;
}

/* ── Copy button ──────────────────────────────────────────────── */
.engine-copy-btn {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 5px 12px;
  font-size: .76rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--color-text-medium);
  font-family: inherit;
  transition: background var(--transition-speed);
  margin-left: auto;
}
.engine-copy-btn:hover {
  background: var(--color-border);
  color: var(--color-text-dark);
}

/* ── Cache badge ──────────────────────────────────────────────── */
.engine-cache-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(76, 175, 80, 0.1);
  color: #2e7d32;
  border: 1px solid rgba(76, 175, 80, 0.25);
  font-size: .64rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: .04em;
  vertical-align: middle;
}

/* ── History panel ────────────────────────────────────────────── */
.engine-history-panel {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 18px 20px;
  margin-top: 20px;
}
.engine-history-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .73rem;
  font-weight: 700;
  color: var(--color-text-medium);
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-bottom: 12px;
}
.engine-history-count {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 1px 8px;
  font-size: .68rem;
  font-weight: 700;
  color: var(--color-text-medium);
}
.engine-history-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.engine-history-item {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: border-color var(--transition-speed);
}
.engine-history-item[open] {
  border-color: var(--color-primary);
}
.engine-history-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background var(--transition-speed);
}
.engine-history-summary::-webkit-details-marker { display: none; }
.engine-history-summary:hover { background: var(--color-background); }
.engine-history-q {
  font-size: .86rem;
  font-weight: 600;
  color: var(--color-text-dark);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  gap: 6px;
}
.engine-history-time {
  font-size: .72rem;
  color: var(--color-text-medium);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}
.engine-history-answer {
  border-top: 1px solid var(--color-border);
  background: var(--color-background);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.engine-history-empty {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 4px;
  color: var(--color-text-medium);
  font-size: .84rem;
}
.engine-history-empty-icon {
  color: var(--color-text-medium);
  opacity: .5;
}

/* ── Upgrade modal ────────────────────────────────────────────── */
.engine-upgrade-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}
.engine-upgrade-box {
  background: var(--color-card-background);
  border-radius: var(--border-radius);
  padding: 32px 28px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .18);
}
.engine-upgrade-icon {
  width: 48px;
  height: 48px;
  background: rgba(92, 107, 192, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--color-primary);
  font-size: 1.2rem;
}
.engine-upgrade-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text-dark);
}
.engine-upgrade-sub {
  font-size: .86rem;
  color: var(--color-text-medium);
  line-height: 1.6;
  margin-bottom: 22px;
}
.engine-upgrade-cta {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  font-size: .92rem;
  padding: 11px 26px;
  border-radius: var(--border-radius);
  text-decoration: none;
  margin-bottom: 12px;
  transition: background var(--transition-speed);
}
.engine-upgrade-cta:hover { background: var(--color-primary-hover, #4A5BAA); }
.engine-upgrade-dismiss {
  display: block;
  background: none;
  border: none;
  color: var(--color-text-medium);
  font-size: .8rem;
  cursor: pointer;
  margin: 6px auto 0;
  font-family: inherit;
}
.engine-upgrade-dismiss:hover { color: var(--color-text-dark); }

/* ── Info strip ───────────────────────────────────────────────── */
.engine-info-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 28px;
}
.engine-info-card {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 16px;
}
.engine-info-icon {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.engine-info-label {
  font-weight: 700;
  font-size: .83rem;
  color: var(--color-text-dark);
  margin-bottom: 4px;
}
.engine-info-desc {
  font-size: .76rem;
  color: var(--color-text-medium);
  line-height: 1.55;
}
@media (max-width: 600px) {
  .engine-info-strip { grid-template-columns: 1fr; }
}

/* ── Spin utility ─────────────────────────────────────────────── */
.engine-spin { animation: engine-spin .8s linear infinite; }
@keyframes engine-spin { to { transform: rotate(360deg); } }

/* ════════════════════════════════════════════════════════════════
   Admin page
   ════════════════════════════════════════════════════════════════ */

.admin-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}
.admin-title { font-size: 1.6rem; font-weight: 800; margin: 0 0 4px; }
.admin-sub { color: var(--color-text-medium); font-size: .9rem; margin-bottom: 28px; }

.admin-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 32px;
}
@media (max-width: 700px) { .admin-grid { grid-template-columns: 1fr; } }

.admin-panel {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 20px;
}
.admin-panel-title {
  font-weight: 700;
  font-size: .95rem;
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-dark);
}
.admin-panel-title .badge {
  font-size: .68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(92, 107, 192, 0.1);
  color: var(--color-primary);
}

.admin-form-group { margin-bottom: 12px; }
.admin-form-label {
  display: block;
  font-size: .78rem;
  font-weight: 600;
  color: var(--color-text-medium);
  margin-bottom: 4px;
}
.admin-form-input,
.admin-form-textarea,
.admin-form-select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: .87rem;
  box-sizing: border-box;
  background: var(--color-background);
  color: var(--color-text-dark);
  transition: border-color var(--transition-speed);
}
.admin-form-textarea { min-height: 110px; resize: vertical; }
.admin-form-input:focus, .admin-form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.admin-btn {
  padding: 9px 18px;
  border: none;
  border-radius: var(--border-radius);
  font-size: .86rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition-speed);
}
.admin-btn:disabled { opacity: .45; cursor: not-allowed; }
.admin-btn-primary { background: var(--color-primary); color: #fff; }
.admin-btn-primary:hover:not(:disabled) { background: var(--color-primary-hover, #4A5BAA); }
.admin-btn-danger { background: rgba(239, 83, 80, 0.08); color: var(--color-error); border: 1px solid rgba(239, 83, 80, 0.2); }
.admin-btn-danger:hover:not(:disabled) { background: rgba(239, 83, 80, 0.14); }

.admin-status { margin-top: 8px; font-size: .8rem; min-height: 20px; }
.admin-status.ok  { color: var(--color-success); }
.admin-status.err { color: var(--color-error); }

.shortcuts-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.shortcuts-count {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: .75rem;
  font-weight: 600;
  color: var(--color-text-medium);
}
.shortcut-list { display: flex; flex-direction: column; gap: 8px; }
.shortcut-item {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 12px 14px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.shortcut-item-body { flex: 1; min-width: 0; }
.shortcut-item-title {
  font-weight: 700;
  font-size: .87rem;
  color: var(--color-text-dark);
  margin: 0 0 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.shortcut-item-meta { font-size: .73rem; color: var(--color-text-medium); margin-bottom: 4px; }
.shortcut-item-text {
  font-size: .78rem;
  color: var(--color-text-medium);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.shortcut-subject-pill {
  display: inline-block;
  font-size: .66rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 8px;
  background: rgba(92, 107, 192, 0.1);
  color: var(--color-primary);
  white-space: nowrap;
}
.shortcut-delete-btn {
  background: none;
  border: 1px solid rgba(239, 83, 80, 0.3);
  color: var(--color-error);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: .73rem;
  cursor: pointer;
  flex-shrink: 0;
  font-family: inherit;
  transition: background var(--transition-speed);
}
.shortcut-delete-btn:hover { background: rgba(239, 83, 80, 0.08); }

.admin-empty {
  text-align: center;
  padding: 28px;
  color: var(--color-text-medium);
  font-size: .88rem;
}