/* ==========================================================================
   Smart Study Hub — Smart Panel (Compiler + AI Study Assistant)
   Styles for slide-out right drawer, OneCompiler iframe, AI chat, & saved tab
   ========================================================================== */

:root {
  --sp-width: 440px;
}

/* ── Panel Container ── */
.smart-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--sp-width, 440px);
  min-width: 340px;
  max-width: 90vw;
  height: 100vh;
  height: 100dvh;
  background: var(--bg, #0f172a);
  border-left: 1px solid var(--border, #334155);
  box-shadow: var(--shadow-lg, -6px 0 28px rgba(0, 0, 0, 0.45));
  display: flex;
  flex-direction: column;
  z-index: 10001;
  transform: translateX(100%);
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: var(--font, 'Inter', sans-serif);
  color: var(--text, #f8fafc);
  overflow: hidden;
}

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

/* ── Left Resize Drag Handle ── */
.sp-resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  z-index: 10002;
  background: transparent;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.sp-resize-handle:hover,
.sp-resize-handle.dragging {
  background: var(--accent1, #6366f1);
  opacity: 0.8;
}

/* ── Panel Header ── */
.sp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.75rem;
  background: var(--card, #1e293b);
  border-bottom: 1px solid var(--border, #334155);
  user-select: none;
  gap: 0.5rem;
  flex-shrink: 0;
  min-width: 0;
  position: relative;
}

.sp-tabs {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.sp-tabs::-webkit-scrollbar {
  display: none;
}

.sp-tab {
  background: transparent;
  border: none;
  padding: 0.38rem 0.55rem;
  border-radius: var(--radius-sm, 6px);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted, #94a3b8);
  cursor: pointer;
  transition: all var(--transition, 0.2s);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  white-space: nowrap;
  font-family: inherit;
  flex-shrink: 0;
}

.sp-tab:hover {
  color: var(--text, #f8fafc);
  background: var(--card2, rgba(255, 255, 255, 0.05));
}

.sp-tab.active {
  color: #ffffff;
  background: var(--accent1, #6366f1);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
}

.sp-header-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
  margin-left: auto;
  position: relative;
  z-index: 5;
}

.sp-icon-btn {
  background: transparent;
  border: 1px solid var(--border, #334155);
  border-radius: var(--radius-sm, 6px);
  color: var(--text-muted, #94a3b8);
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.88rem;
  padding: 0;
  flex-shrink: 0;
}

.sp-icon-btn:hover {
  color: var(--text, #f8fafc);
  background: var(--card2, rgba(255, 255, 255, 0.06));
  border-color: var(--accent1, #6366f1);
}

/* ── Content Panes ── */
.sp-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.sp-content.hidden {
  display: none !important;
}

/* ── Non-coding Subjects: Hide Compiler Tab ── */
body[data-subject-type="noncoding"] #tabCompiler,
body[data-subject-type="noncoding"] #contentCompiler {
  display: none !important;
}

/* ── Compiler Tab (OneCompiler iframe) ── */
#contentCompiler {
  width: 100%;
  height: 100%;
  position: relative;
  background: #1e1e1e;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Code / Output sub-tab bar (narrow mode) ── */
.sp-compiler-subtabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2px;
  padding: 5px 8px 4px;
  background: #161b22;
  border-bottom: 1px solid #30363d;
  flex-shrink: 0;
  z-index: 5;
}

.sp-subtabs-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.sp-compiler-subtabs.sp-wide-mode .sp-subtabs-group {
  /* In wide mode, OneCompiler shows both panes, so we don't need manual toggles */
  display: none;
}

.sp-compiler-subtab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: #8b949e;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  font-family: inherit;
}
.sp-compiler-subtab:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #e6edf3;
}
.sp-compiler-subtab.active {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border-color: rgba(99, 102, 241, 0.35);
}
.sp-compiler-subtab span {
  font-size: 0.72rem;
}

.sp-custom-ai-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  background: #10b981;
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.sp-custom-ai-btn:hover {
  background: #059669;
  transform: translateY(-1px);
}
.sp-custom-ai-btn span {
  font-size: 0.75rem;
}

.sp-custom-run-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 16px;
  background: #ec4899;
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.sp-custom-run-btn:hover {
  background: #db2777;
  transform: translateY(-1px);
}
.sp-custom-run-btn span {
  font-size: 0.65rem;
}

/* iframe fills remaining height below the sub-tab bar */
.sp-compiler-iframe {
  flex: 1;
  min-height: 0;
  border: none;
  display: block;
  background: #1e1e1e;
  /* Narrow mode logic: OneCompiler uses a 60/40 split (flex: 3 vs flex: 2).
     By setting width to 100 / 0.6 = 166.666%, the Code pane perfectly fits 100% of the container! */
  width: 166.666%;
  max-width: none;
  transform-origin: left top;
  transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* When Code sub-tab is active (narrow mode), show left half */
#contentCompiler[data-view="code"]:not(.sp-compiler-wide) .sp-compiler-iframe {
  transform: translateX(0);
}

/* When Output sub-tab is active (narrow mode), shift left by exactly the Code pane's width (60% of iframe width) */
#contentCompiler[data-view="output"]:not(.sp-compiler-wide) .sp-compiler-iframe {
  transform: translateX(-60%);
}

/* Wide Mode overrides (if any needed) */
#contentCompiler.sp-compiler-wide .sp-compiler-iframe {
  width: 100%;
  transform: translateX(0) !important;
}

.sp-compiler-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #1e1e1e;
  color: var(--text-muted, #94a3b8);
  font-size: 0.88rem;
  gap: 0.75rem;
  z-index: 2;
  transition: opacity 0.3s ease;
}

.sp-compiler-error-banner {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.95);
  border-top: 1px solid rgba(239, 68, 68, 0.5);
  color: #fca5a5;
  padding: 0.5rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  z-index: 10;
  box-shadow: 0 -3px 12px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
}

.sp-compiler-error-banner button {
  background: #ef4444;
  color: #ffffff;
  border: none;
  border-radius: 4px;
  padding: 0.25rem 0.6rem;
  font-size: 0.74rem;
  cursor: pointer;
  font-weight: 700;
  transition: all 0.15s;
}

.sp-compiler-error-banner button:hover {
  background: #dc2626;
  transform: translateY(-1px);
}

.sp-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent1, #6366f1);
  border-radius: 50%;
  animation: spSpin 0.8s linear infinite;
}

@keyframes spSpin {
  to { transform: rotate(360deg); }
}

/* ── AI Tab: Setup Screen ── */
.sp-setup {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  text-align: center;
  gap: 0.85rem;
  overflow-y: auto;
}

.sp-setup.hidden {
  display: none !important;
}

.sp-setup-icon {
  font-size: 2.75rem;
  margin-bottom: 0.2rem;
  animation: spPulse 2s infinite ease-in-out;
}

@keyframes spPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.sp-setup-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text, #f8fafc);
  margin: 0;
}

.sp-setup-desc {
  font-size: 0.84rem;
  color: var(--text-muted, #94a3b8);
  line-height: 1.55;
  margin: 0;
  max-width: 320px;
}

.sp-setup-desc a {
  color: var(--accent1, #6366f1);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.sp-label {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted, #94a3b8);
  margin-top: 0.4rem;
  margin-bottom: -0.3rem;
}

.sp-select,
.sp-key-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--card2, #0f172a);
  border: 1px solid var(--border, #334155);
  border-radius: var(--radius-sm, 6px);
  color: var(--text, #f8fafc);
  font-size: 0.86rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-sizing: border-box;
  font-family: inherit;
}

.sp-select:focus,
.sp-key-input:focus {
  border-color: var(--accent1, #6366f1);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.sp-btn-primary {
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--accent1, #6366f1);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-sm, 6px);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 0.6rem;
  font-family: inherit;
}

.sp-btn-primary:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
}

/* ── AI Tab: Chat Container ── */
.sp-chat {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
}

.sp-chat.hidden {
  display: none !important;
}

.sp-chat-subject-tag {
  padding: 0.45rem 0.85rem;
  background: var(--card, #1e293b);
  border-bottom: 1px solid var(--border, #334155);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent2, #38bdf8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ── Model Switcher Pill (replaces static badge) ── */
.sp-model-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent2, #38bdf8);
  background: var(--card2, rgba(255, 255, 255, 0.06));
  border: 1px solid var(--border, #334155);
  border-radius: 6px;
  padding: 0.18rem 0.5rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
  position: relative;
}
.sp-model-pill:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent2, #38bdf8);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.15);
}
.sp-model-pill-icon { font-size: 0.7rem; }
.sp-model-pill-name { max-width: 120px; overflow: hidden; text-overflow: ellipsis; }
.sp-model-pill-caret { font-size: 0.55rem; opacity: 0.7; margin-left: 1px; }

/* ── Export button ── */
.sp-export-btn {
  background: transparent;
  border: 1px solid var(--border, #334155);
  border-radius: 4px;
  color: var(--text-muted, #94a3b8);
  cursor: pointer;
  font-size: 0.72rem;
  padding: 0.15rem 0.4rem;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.sp-export-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text, #f8fafc);
}

/* ── Model Switcher Popover ── */
.sp-model-popover {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  z-index: 9999;
  min-width: 270px;
  max-width: 320px;
  background: #0f172a;
  border: 1px solid var(--border, #334155);
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.3);
  padding: 6px 0;
  overflow: hidden;
  animation: spPopoverIn 0.12s ease;
}
@keyframes spPopoverIn {
  from { opacity: 0; transform: translateY(-4px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.sp-model-popover-group {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px 4px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted, #64748b);
  user-select: none;
}

.sp-model-popover-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 12px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background 0.12s;
  color: var(--text, #e2e8f0);
}
.sp-model-popover-item:hover {
  background: rgba(255, 255, 255, 0.06);
}
.sp-model-popover-item.active {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent2, #38bdf8);
}
.sp-model-popover-item.locked {
  opacity: 0.5;
  cursor: pointer;
}
.sp-model-popover-item.locked:hover {
  background: rgba(255, 200, 0, 0.06);
  opacity: 0.8;
}

.sp-model-item-check {
  font-size: 0.6rem;
  width: 14px;
  flex-shrink: 0;
  color: var(--accent2, #38bdf8);
}
.sp-model-item-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex: 1;
  min-width: 0;
}
.sp-model-item-name {
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sp-model-item-desc {
  font-size: 0.63rem;
  color: var(--text-muted, #64748b);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sp-model-no-key {
  font-size: 0.62rem;
  color: #f59e0b;
  flex-shrink: 0;
  padding: 1px 5px;
  background: rgba(245, 158, 11, 0.1);
  border-radius: 4px;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.sp-model-popover-sep {
  height: 1px;
  background: var(--border, #1e293b);
  margin: 4px 0;
}

/* ── Chat Messages ── */
.sp-messages {
  flex: 1;
  overflow-y: auto;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-height: 0;
}

.sp-msg-user {
  align-self: flex-end;
  background: var(--accent1, #6366f1);
  color: #ffffff;
  max-width: 86%;
  padding: 0.65rem 0.9rem;
  border-radius: 14px 14px 2px 14px;
  font-size: 0.86rem;
  line-height: 1.55;
  word-break: break-word;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.sp-msg-ai {
  align-self: flex-start;
  background: var(--card2, #1e293b);
  color: var(--text, #f8fafc);
  border: 1px solid var(--border, #334155);
  max-width: 92%;
  padding: 0.75rem 0.95rem;
  border-radius: 14px 14px 14px 2px;
  font-size: 0.86rem;
  line-height: 1.55;
  word-break: break-word;
  position: relative;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.sp-msg-ai p {
  margin: 0 0 0.5rem 0;
}

.sp-msg-ai p:last-child {
  margin-bottom: 0;
}

.sp-msg-ai ul,
.sp-msg-ai ol {
  margin: 0.35rem 0 0.5rem 1.2rem;
  padding: 0;
}

.sp-msg-ai li {
  margin-bottom: 0.25rem;
}

.sp-msg-ai pre {
  background: rgba(0, 0, 0, 0.45);
  border: 1px solid var(--border, #334155);
  border-radius: 6px;
  padding: 0.65rem;
  overflow-x: auto;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  margin: 0.5rem 0;
  line-height: 1.45;
}

.sp-msg-ai code {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.85em;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
}

.sp-msg-ai pre code {
  background: transparent;
  padding: 0;
}

.sp-msg-actions {
  display: flex;
  gap: 0.4rem;
  justify-content: flex-end;
  margin-top: 0.5rem;
  padding-top: 0.4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.sp-msg-action-btn {
  background: transparent;
  border: 1px solid var(--border, #334155);
  border-radius: 4px;
  font-size: 0.72rem;
  color: var(--text-muted, #94a3b8);
  padding: 0.18rem 0.48rem;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-family: inherit;
}

.sp-msg-action-btn:hover {
  color: var(--text, #f8fafc);
  border-color: var(--accent1, #6366f1);
  background: rgba(255, 255, 255, 0.04);
}

.sp-msg-action-btn.saved {
  color: #eab308;
  border-color: #eab308;
  background: rgba(234, 179, 8, 0.12);
  font-weight: 600;
}

/* ── Typing Indicator ── */
.sp-typing {
  align-self: flex-start;
  display: inline-flex;
  gap: 5px;
  padding: 0.65rem 0.95rem;
  background: var(--card2, #1e293b);
  border: 1px solid var(--border, #334155);
  border-radius: 14px 14px 14px 2px;
  align-items: center;
}

.sp-typing-dot {
  width: 7px;
  height: 7px;
  background: var(--text-muted, #94a3b8);
  border-radius: 50%;
  animation: spBounce 1.2s infinite ease-in-out;
}

.sp-typing-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.sp-typing-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes spBounce {
  0%, 80%, 100% {
    transform: scale(0.6);
    opacity: 0.4;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ── Quick Action Buttons ── */
.sp-quick-actions {
  display: flex;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  background: var(--card, #1e293b);
  border-top: 1px solid var(--border, #334155);
  overflow-x: auto;
  scrollbar-width: none;
  flex-shrink: 0;
}

.sp-quick-actions::-webkit-scrollbar {
  display: none;
}

.sp-qa-btn {
  background: var(--card2, #0f172a);
  border: 1px solid var(--border, #334155);
  color: var(--text, #f8fafc);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.28rem 0.65rem;
  border-radius: 20px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  font-family: inherit;
}

.sp-qa-btn:hover {
  background: var(--accent1, #6366f1);
  color: #ffffff;
  border-color: var(--accent1, #6366f1);
}

.sp-viva-btn {
  border-color: rgba(236, 72, 153, 0.4);
  color: #f472b6;
}

.sp-viva-btn:hover {
  background: #ec4899 !important;
  color: #ffffff !important;
  border-color: #ec4899 !important;
}

/* ── Chat Input Row ── */
.sp-input-row {
  display: flex;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  background: var(--card, #1e293b);
  border-top: 1px solid var(--border, #334155);
  align-items: flex-end;
  flex-shrink: 0;
}

.sp-chat-input {
  flex: 1;
  resize: none;
  min-height: 38px;
  max-height: 120px;
  padding: 0.55rem 0.75rem;
  background: var(--card2, #0f172a);
  border: 1px solid var(--border, #334155);
  border-radius: 8px;
  color: var(--text, #f8fafc);
  font-size: 0.86rem;
  outline: none;
  font-family: inherit;
  line-height: 1.4;
  box-sizing: border-box;
  overflow-x: hidden;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sp-chat-input::-webkit-scrollbar {
  display: none;
  width: 0;
  height: 0;
}

.sp-chat-input:focus {
  border-color: var(--accent1, #6366f1);
}

.sp-send-btn {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--accent1, #6366f1);
  color: #ffffff;
  border: none;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
  padding: 0;
}

.sp-send-btn:hover {
  filter: brightness(1.15);
  transform: scale(1.04);
}

.sp-send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* ── Viva Banner ── */
.sp-viva-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.85rem;
  background: rgba(236, 72, 153, 0.15);
  border-top: 1px solid rgba(236, 72, 153, 0.4);
  color: #f472b6;
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
}

.sp-viva-banner.hidden {
  display: none !important;
}

#spEndViva {
  background: #ec4899;
  color: #ffffff;
  border: none;
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

#spEndViva:hover {
  background: #db2777;
}

/* ── Saved Messages Tab ── */
#contentSaved {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.sp-saved-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.9rem;
  background: var(--card, #1e293b);
  border-bottom: 1px solid var(--border, #334155);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text, #f8fafc);
  flex-shrink: 0;
}

.sp-btn-danger-sm {
  background: transparent;
  color: var(--danger, #ef4444);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.sp-btn-danger-sm:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: var(--danger, #ef4444);
}

.sp-saved-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 0;
}

.sp-saved-card {
  background: var(--card2, #1e293b);
  border: 1px solid var(--border, #334155);
  border-radius: 8px;
  padding: 0.75rem;
  font-size: 0.84rem;
  line-height: 1.5;
  position: relative;
}

.sp-saved-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted, #94a3b8);
  margin-bottom: 0.4rem;
}

.sp-saved-delete-btn {
  background: transparent;
  border: none;
  color: var(--text-muted, #94a3b8);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0 0.2rem;
  line-height: 1;
}

.sp-saved-delete-btn:hover {
  color: var(--danger, #ef4444);
}

.sp-saved-empty {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-muted, #94a3b8);
  font-size: 0.86rem;
  padding: 2rem;
  line-height: 1.6;
}

.sp-saved-empty.hidden {
  display: none !important;
}

/* ── Settings Panel Overlay ── */
.sp-settings-panel {
  position: absolute;
  inset: 0;
  background: var(--bg, #0f172a);
  z-index: 1002;
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
  gap: 0.75rem;
  overflow-y: auto;
}

.sp-settings-panel.hidden {
  display: none !important;
}

.sp-settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text, #f8fafc);
  border-bottom: 1px solid var(--border, #334155);
  padding-bottom: 0.75rem;
  margin-bottom: 0.25rem;
}

.sp-settings-header button {
  background: transparent;
  border: none;
  font-size: 1.1rem;
  color: var(--text-muted, #94a3b8);
  cursor: pointer;
  padding: 0.2rem;
}

.sp-settings-header button:hover {
  color: var(--text, #f8fafc);
}

.sp-key-row {
  display: flex;
  gap: 0.4rem;
}

.sp-btn-sm {
  padding: 0.5rem 0.75rem;
  background: var(--card2, #1e293b);
  border: 1px solid var(--border, #334155);
  border-radius: 6px;
  color: var(--text, #f8fafc);
  cursor: pointer;
  font-size: 0.8rem;
  font-family: inherit;
}

.sp-btn-sm:hover {
  background: var(--card, #334155);
}

.sp-btn-danger {
  width: 100%;
  padding: 0.65rem 1rem;
  background: transparent;
  color: var(--danger, #ef4444);
  border: 1px solid var(--danger, #ef4444);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.sp-btn-danger:hover {
  background: rgba(239, 68, 68, 0.12);
}

.sp-settings-note {
  font-size: 0.74rem;
  color: var(--text-muted, #94a3b8);
  line-height: 1.5;
  text-align: center;
  margin-top: auto;
  padding-top: 1rem;
}

/* ── Panel Toggle Tab (Floating on Right Edge) ── */
.sp-toggle-tab {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  padding: 1.1rem 0.6rem;
  background: linear-gradient(180deg, #1e293b, #0f172a);
  border: 1.5px solid var(--accent1, #6366f1);
  border-right: none;
  border-radius: 12px 0 0 12px;
  color: #ffffff;
  cursor: pointer;
  z-index: 9999;
  box-shadow: -4px 0 20px rgba(99, 102, 241, 0.45), 0 0 12px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.8px;
  font-family: inherit;
  transition: transform 0.2s, opacity 0.2s, background 0.2s, color 0.2s, box-shadow 0.2s;
}

.sp-toggle-tab:hover {
  background: var(--accent1, #6366f1);
  color: #ffffff;
  box-shadow: -6px 0 25px rgba(99, 102, 241, 0.65);
  transform: translateY(-50%) translateX(-4px);
}

body.panel-open .sp-toggle-tab,
body.theme-drawer-open .sp-toggle-tab,
body:has(#themeSelectorModal.open:not(.minimized)) .sp-toggle-tab {
  opacity: 0 !important;
  pointer-events: none !important;
  transform: translateY(-50%) translateX(120%) !important;
}

body.panel-open .sp-first-visit-tip,
body.theme-drawer-open .sp-first-visit-tip,
body:has(#themeSelectorModal.open:not(.minimized)) .sp-first-visit-tip {
  opacity: 0 !important;
  pointer-events: none !important;
}

/* ── Desktop Smooth Page Push When Smart Panel Is Open ── */
@media (min-width: 1025px) {
  body.panel-open {
    padding-right: var(--sp-width, 440px) !important;
    transition: padding-right 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  }
  body.panel-open .navbar {
    right: var(--sp-width, 440px) !important;
    padding-left: 1rem !important;
    padding-right: 1rem !important;
    gap: 0.5rem !important;
    transition: right 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  }
  body.panel-open .nav-links {
    display: flex !important;
    overflow-x: auto !important;
    scrollbar-width: none !important;
    flex: 1 1 auto !important;
    min-width: 0 !important;
    gap: 0.15rem !important;
  }
  body.panel-open .nav-links::-webkit-scrollbar {
    display: none !important;
  }
  body.panel-open .nav-link {
    padding: 0.35rem 0.5rem !important;
    font-size: 0.78rem !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }
  body.panel-open .nav-actions {
    flex-shrink: 0 !important;
    margin-left: auto !important;
  }
  body.panel-open .fab-top {
    right: calc(var(--sp-width, 440px) + 1.5rem) !important;
  }
  body.panel-open .fab-formula {
    right: calc(var(--sp-width, 440px) + 1.5rem) !important;
  }
}

.sp-toggle-icon {
  font-size: 1.1rem;
}

/* ── First-Visit Tooltip ── */
.sp-first-visit-tip {
  position: fixed;
  right: 60px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--accent1, #6366f1);
  color: #ffffff;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  z-index: 9998;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  white-space: nowrap;
}

.sp-first-visit-tip.show {
  opacity: 1;
}

.sp-first-visit-tip::after {
  content: '';
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 6px solid var(--accent1, #6366f1);
}

/* ── Injected Code Block "Run ▶" Button ── */
.run-code-btn {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  background: var(--accent5, #10b981);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-sm, 6px);
  padding: 0.25rem 0.65rem;
  font-size: 0.74rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition, 0.2s), transform 0.15s, background 0.2s;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  font-family: inherit;
}

.run-code-btn:hover {
  filter: brightness(1.15);
  transform: scale(1.05);
}

pre:hover .run-code-btn,
.code-block:hover .run-code-btn {
  opacity: 1;
}

/* ── Injected Topic Heading "🤖 Explain" Button ── */
.explain-topic-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: 0.6rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font, inherit);
  background: var(--card2, #1e293b);
  color: var(--text-muted, #94a3b8);
  border: 1px solid var(--border, #334155);
  border-radius: var(--radius-sm, 6px);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition, 0.2s);
  vertical-align: middle;
}

.topic-title:hover .explain-topic-btn,
.unit-topic-head:hover .explain-topic-btn,
.topic-card:hover .explain-topic-btn,
h3:hover .explain-topic-btn {
  opacity: 1;
}

.explain-topic-btn:hover {
  color: var(--accent1, #6366f1);
  border-color: var(--accent1, #6366f1);
  background: var(--card, #0f172a);
}

/* ── Responsive & Mobile ── */
@media (max-width: 1024px) {
  .smart-panel {
    width: min(85vw, 440px) !important;
    max-width: 90vw !important;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.55);
  }
}

@media (max-width: 768px) {
  .smart-panel {
    width: 100vw !important;
    max-width: 100vw !important;
  }
  .sp-resize-handle {
    display: none;
  }
}