/* ============================================================
   AI Tutor V2 — Apple documentary visual system
   Quiet editorial framing for a high-frequency research tool.
   ============================================================ */

:root {
  --doc-ink: #111827;
  --doc-muted: #4b5563;
  --doc-faint: #9ca3af;
  --doc-paper: #ffffff;
  --doc-canvas: #f4f6f7;
  --doc-line: #e5e7eb;
  --doc-line-soft: #f3f4f6;
  --doc-blue: #2563eb;
  --doc-blue-soft: #dbeafe;
  --doc-green: #10b981;
  --doc-green-soft: #d1fae5;
  --doc-amber: #f59e0b;
  --doc-amber-soft: #fef3c7;
  --doc-red: #ef4444;
  --doc-red-soft: #fee2e2;
  --doc-radius: 8px;
  --doc-shadow: 0 1px 2px rgba(19, 24, 29, 0.03), 0 10px 30px rgba(19, 24, 29, 0.035);
  --doc-ease: cubic-bezier(.2, .8, .2, 1);
}

html,
body {
  background: var(--doc-canvas) !important;
  color: var(--doc-ink) !important;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Hiragino Sans",
    "Noto Sans JP", sans-serif !important;
  letter-spacing: 0 !important;
}

body {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.62)),
    radial-gradient(circle at 18% 0%, rgba(23, 105, 224, 0.045), transparent 34%);
  background-attachment: fixed;
}

.app-shell {
  max-width: none !important;
}

/* ── Calm utility header ───────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 350;
  min-height: 58px;
  padding: 0 max(24px, calc((100vw - 1400px) / 2)) !important;
  background: linear-gradient(135deg, #2563eb, #7c3aed) !important;
  border-bottom: 0;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.18);
}

.topbar__logo {
  color: #ffffff !important;
  font-size: 15px !important;
  font-weight: 750 !important;
  letter-spacing: 0 !important;
}

.topbar__logo::before {
  content: "";
  width: 8px;
  height: 8px;
  display: inline-block;
  margin-right: 9px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 0 5px rgba(255, 255, 255, 0.18);
  vertical-align: 1px;
}

.topbar__actions {
  gap: 8px !important;
}

.topbar__link,
.topbar__logout,
.topbar__theme-btn {
  min-height: 34px !important;
  border: 1px solid rgba(255, 255, 255, 0.25) !important;
  border-radius: 6px !important;
  background: rgba(255, 255, 255, 0.12) !important;
  color: #ffffff !important;
  font-size: 12px !important;
  font-weight: 650 !important;
  box-shadow: none !important;
}

.topbar__link:hover,
.topbar__logout:hover,
.topbar__theme-btn:hover {
  border-color: rgba(255, 255, 255, 0.45) !important;
  background: rgba(255, 255, 255, 0.22) !important;
  color: #ffffff !important;
}

/* ── Six-stage navigation ──────────────────────────── */
#stepper {
  position: sticky !important;
  top: 58px !important;
  z-index: 300 !important;
  display: block !important;
  padding: 0 !important;
  overflow: visible !important;
  border-bottom: 1px solid var(--doc-line) !important;
  background: rgba(244, 246, 247, 0.92) !important;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.phase-navigation {
  max-width: 1440px;
  margin: 0 auto;
}

.phase-navigation__phases {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  min-height: 48px;
  border-right: 1px solid var(--doc-line);
}

.phase-navigation__phase {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-left: 1px solid var(--doc-line);
  border-radius: 0;
  background: transparent;
  color: var(--doc-muted);
  font: inherit;
  font-size: 11px;
  font-weight: 650;
  cursor: pointer;
  transition: color 160ms var(--doc-ease), background 160ms var(--doc-ease);
}

.phase-navigation__phase:hover {
  background: rgba(255, 255, 255, 0.62);
  color: var(--doc-ink);
}

.phase-navigation__phase--active {
  background: var(--doc-paper);
  color: var(--doc-ink);
}

.phase-navigation__phase--active::after {
  content: "";
  position: absolute;
  align-self: flex-end;
  width: 52px;
  height: 2px;
  background: var(--doc-blue);
}

.phase-navigation__number {
  color: var(--doc-faint);
  font-size: 9px;
  font-variant-numeric: tabular-nums;
}

.phase-navigation__phase--completed .phase-navigation__number {
  color: var(--doc-green);
}

.phase-navigation__steps {
  min-height: 56px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 7px 24px;
  border-top: 1px solid var(--doc-line-soft);
  background: rgba(255, 255, 255, 0.82);
}

.phase-navigation__current-label {
  flex-shrink: 0;
  color: var(--doc-faint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.phase-navigation__step-list {
  min-width: 0;
  display: flex;
  gap: 5px;
  overflow-x: auto;
  scrollbar-width: none;
}

.phase-navigation__step-list::-webkit-scrollbar {
  display: none;
}

.phase-navigation__step {
  min-width: 112px;
  display: grid;
  gap: 1px;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--doc-muted);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 160ms var(--doc-ease), border-color 160ms var(--doc-ease);
}

.phase-navigation__step:hover {
  border-color: var(--doc-line);
  background: var(--doc-paper);
}

.phase-navigation__step > span {
  color: var(--doc-faint);
  font-size: 9px;
}

.phase-navigation__step > strong {
  overflow: hidden;
  font-size: 11px;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.phase-navigation__step--current {
  border-color: rgba(23, 105, 224, 0.22);
  background: var(--doc-blue-soft);
  color: #104da6;
}

.phase-navigation__step--completed > span::after {
  content: "  ✓";
  color: var(--doc-green);
}

/* The former colorful progress bar duplicates the new navigation. */
.research-stage-bar {
  display: none !important;
}

/* ── Project context and archive sheet ─────────────── */
#welcomeBanner-wrapper {
  max-width: 1400px !important;
  padding: 0 24px !important;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

#welcomeBanner {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  margin-top: 12px;
  color: var(--doc-muted);
  font-size: 12px;
}

#welcomeBanner strong {
  color: var(--doc-ink);
}

#welcomeBanner svg {
  stroke: var(--doc-blue) !important;
}

#prototypeNotice {
  max-width: 760px;
  margin: 0 auto 10px;
  color: var(--doc-faint);
  font-size: 10px;
  line-height: 1.5;
  text-align: center;
}

.project-context {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  max-width: 420px;
  min-height: 56px;
  margin: 8px 0 0 auto;
  padding: 8px 10px 8px 14px;
  border: 1px solid var(--doc-line);
  border-radius: var(--doc-radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 1px 2px rgba(19, 24, 29, 0.025);
}

.project-context--visible {
  display: flex;
}

.project-context__copy {
  min-width: 0;
  display: grid;
}

.project-context__copy > span {
  color: var(--doc-faint);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.project-context__copy > strong {
  overflow: hidden;
  color: var(--doc-ink);
  font-size: 12px;
  font-weight: 680;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.project-context__button {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  padding: 0 12px;
  border: 1px solid var(--doc-line);
  border-radius: 6px;
  background: var(--doc-paper);
  color: var(--doc-muted);
  font: inherit;
  font-size: 11px;
  font-weight: 650;
  cursor: pointer;
}

.project-context__button:hover {
  border-color: #b8c0c7;
  color: var(--doc-ink);
}

.project-context__button > span {
  min-width: 24px;
  padding: 2px 6px;
  border-radius: 999px;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  color: #ffffff;
  font-size: 9px;
  text-align: center;
}

#savedResearchCount {
  background: linear-gradient(135deg, #ff6b6b, #ff9100);
  font-weight: 700;
}

.project-context__toggle {
  min-width: 32px;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--line-light);
  color: var(--ink);
  font-size: 12px;
  cursor: pointer;
  border: 1px solid var(--line);
  transition: all 0.2s ease;
}

.project-context__toggle:hover {
  background: var(--line);
}

#taskBoardToggleIcon {
  display: inline-block;
  transition: transform 0.3s ease;
}

#taskBoardToggleIcon.collapsed {
  transform: rotate(180deg);
}

#researchTaskBoard {
  max-width: 100%;
  margin-left: 0;
  transition: all 0.3s ease;
}

#researchTaskBoard.hidden {
  display: none;
}

.project-sheet[hidden] {
  display: none;
}

.project-sheet {
  position: fixed;
  inset: 0;
  z-index: 5000;
}

.project-sheet__backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  border: 0;
  background: rgba(16, 19, 23, 0.32);
  opacity: 0;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  transition: opacity 240ms var(--doc-ease);
}

.project-sheet__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(440px, 92vw);
  height: 100%;
  display: flex;
  flex-direction: column;
  background: #f8f9fa;
  box-shadow: -20px 0 60px rgba(16, 19, 23, 0.13);
  transform: translateX(100%);
  transition: transform 300ms var(--doc-ease);
}

.project-sheet--open .project-sheet__backdrop {
  opacity: 1;
}

.project-sheet--open .project-sheet__panel {
  transform: translateX(0);
}

.project-sheet-open {
  overflow: hidden;
}

.project-sheet__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 24px 20px;
  border-bottom: 1px solid var(--doc-line);
  background: var(--doc-paper);
}

.project-sheet__header span {
  color: var(--doc-blue);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.12em;
}

.project-sheet__header h2 {
  margin: 6px 0 3px;
  color: var(--doc-ink);
  font-size: 22px;
  letter-spacing: 0;
}

.project-sheet__header p {
  margin: 0;
  color: var(--doc-muted);
  font-size: 12px;
}

.project-sheet__close {
  width: 34px;
  height: 34px;
  border: 1px solid var(--doc-line);
  border-radius: 50%;
  background: transparent;
  color: var(--doc-muted);
  font-size: 20px;
  cursor: pointer;
}

.project-sheet__list {
  display: grid;
  gap: 8px;
  padding: 16px;
  overflow-y: auto;
}

.project-sheet__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 10px;
  padding: 15px;
  border: 1px solid var(--doc-line);
  border-radius: var(--doc-radius);
  background: var(--doc-paper);
  color: var(--doc-ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 160ms var(--doc-ease), transform 160ms var(--doc-ease);
}

.project-sheet__item:hover {
  border-color: #aeb6be;
  transform: translateY(-1px);
}

.project-sheet__item--active {
  border-color: rgba(23, 105, 224, 0.42);
  box-shadow: inset 3px 0 0 var(--doc-blue);
}

.project-sheet__item-state {
  grid-row: 1 / span 2;
  align-self: start;
  padding: 3px 6px;
  border-radius: 4px;
  background: var(--doc-blue-soft);
  color: var(--doc-blue);
  font-size: 9px;
  font-weight: 750;
}

.project-sheet__item strong {
  min-width: 0;
  overflow: hidden;
  font-size: 12px;
  font-weight: 680;
  line-height: 1.55;
  text-overflow: ellipsis;
}

.project-sheet__item small {
  color: var(--doc-faint);
  font-size: 10px;
}

/* ── Consistent page frame ─────────────────────────── */
.v2-workspace {
  position: relative;
  max-width: 1400px !important;
  grid-template-columns: minmax(0, 1fr) 420px !important;
  grid-template-rows: auto 1fr !important;
  gap: 24px !important;
  padding: 16px 24px 84px !important;
}

#step-container {
  min-width: 0;
  grid-column: 1;
  grid-row: 1 / 3;
}

#welcomeBanner-wrapper {
  grid-column: 2;
  grid-row: 1;
  max-width: none;
  padding: 0;
  align-items: stretch;
}

#welcomeBanner-wrapper .project-context {
  max-width: 100%;
  margin-left: 0;
  margin-bottom: 16px;
}

#researchTaskBoard {
  max-width: 100%;
  margin-left: 0;
}

#globalMentorPanel {
  grid-column: 2;
  grid-row: 2;
  height: calc(100vh - 214px - var(--welcome-banner-height, 0px)) !important;
}

#step-container > .card {
  margin-bottom: 12px !important;
  padding: 0 !important;
  border: 1px solid var(--doc-line) !important;
  border-radius: var(--doc-radius) !important;
  background: rgba(255, 255, 255, 0.96) !important;
  box-shadow: var(--doc-shadow) !important;
  transform: none !important;
  overflow: hidden;
}

#step-container > .card:hover {
  box-shadow: var(--doc-shadow) !important;
  transform: none !important;
}

#step-container > .card:first-of-type {
  border: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}

#step-container > .card:first-of-type .card__body {
  padding: 12px 4px 18px !important;
}

#step-container > .card:first-of-type .tag {
  margin-bottom: 7px !important;
  padding: 0 !important;
  border: 0 !important;
  background: transparent !important;
  color: var(--doc-blue) !important;
  font-size: 9px !important;
  font-weight: 750 !important;
  letter-spacing: 0.1em !important;
}

#step-container > .card:first-of-type h2 {
  color: var(--doc-ink) !important;
  font-size: 26px !important;
  font-weight: 720 !important;
  line-height: 1.3 !important;
  letter-spacing: 0 !important;
}

#step-container > .card:first-of-type p {
  max-width: 720px;
  color: var(--doc-muted) !important;
  font-size: 13px !important;
  line-height: 1.85 !important;
}

.card__body {
  padding: 20px !important;
}

.card__body > h3 {
  color: var(--doc-ink) !important;
  font-size: 15px !important;
  font-weight: 680 !important;
  letter-spacing: 0 !important;
}

.card .card {
  border-radius: 6px !important;
  box-shadow: none !important;
}

section[style*="border:1px"],
section[style*="border: 1px"] {
  border-color: var(--doc-line) !important;
  border-radius: 6px !important;
  background: #fff !important;
}

textarea,
input[type="text"],
input:not([type]),
select {
  border: 1px solid #cfd5da !important;
  border-radius: 6px !important;
  background: #fbfcfc !important;
  color: var(--doc-ink) !important;
  box-shadow: none !important;
}

textarea:focus,
input[type="text"]:focus,
input:not([type]):focus,
select:focus {
  border-color: var(--doc-blue) !important;
  box-shadow: 0 0 0 3px rgba(23, 105, 224, 0.12) !important;
}

.action-row {
  align-items: center;
  justify-content: flex-end;
  margin-top: 18px !important;
  padding-top: 16px;
  border-top: 1px solid var(--doc-line-soft);
}

/* Support both historical and current button class spellings. */
.btn,
.btn--primary,
.btn--secondary,
.btn--success,
.btn--danger,
.btn--text {
  min-height: 38px;
  border-radius: 6px !important;
  font-size: 12px !important;
  font-weight: 680 !important;
  box-shadow: none !important;
  transform: none !important;
}

.btn-primary,
.btn--primary {
  border-color: var(--doc-ink) !important;
  background: var(--doc-ink) !important;
  color: #fff !important;
}

.btn-primary:hover,
.btn--primary:hover {
  border-color: #34383d !important;
  background: #34383d !important;
}

.btn-secondary,
.btn--secondary {
  border-color: var(--doc-line) !important;
  background: var(--doc-paper) !important;
  color: var(--doc-ink) !important;
}

.btn--success {
  border-color: var(--doc-green) !important;
  background: var(--doc-green) !important;
  color: #fff !important;
}

.btn-danger,
.btn--danger:not(.btn--text) {
  border-color: var(--doc-red) !important;
  background: var(--doc-red) !important;
  color: #fff !important;
}

.btn--text {
  min-height: 32px;
  border-color: var(--doc-line) !important;
  background: transparent !important;
  color: var(--doc-muted) !important;
}

.tag {
  border-radius: 4px !important;
}

/* ── Step2 feedback: status first, evidence on demand ─ */
.field-review {
  padding: 12px 14px;
  border: 1px solid var(--doc-line);
  border-radius: 6px;
  background: #fbfcfc;
}

.field-review__summary {
  display: flex;
  align-items: flex-start;
  gap: 9px;
}

.field-review__signal {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  margin-top: 5px;
  border-radius: 50%;
  background: var(--doc-amber);
}

.field-review--ready .field-review__signal {
  background: var(--doc-green);
}

.field-review__summary strong,
.field-review__summary small {
  display: block;
}

.field-review__summary strong {
  color: var(--doc-ink);
  font-size: 12px;
}

.field-review__summary small {
  margin-top: 1px;
  color: var(--doc-faint);
  font-size: 9px;
}

.field-review__previous-note {
  margin: 10px 0 0;
  padding-top: 9px;
  border-top: 1px dashed var(--doc-line);
  color: var(--doc-muted);
  font-size: 12px;
  line-height: 1.65;
}

.field-review > p {
  margin: 8px 0 0;
  color: var(--doc-muted);
  font-size: 11px;
  line-height: 1.7;
}

.field-review__details,
.overall-review-details {
  margin-top: 9px;
  padding-top: 9px;
  border-top: 1px solid var(--doc-line-soft);
}

.field-review__details summary,
.overall-review-details summary {
  color: var(--doc-blue);
  font-size: 10px;
  font-weight: 680;
  cursor: pointer;
}

.field-review__details > div,
.overall-review-details > div {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.field-review__details section strong {
  color: var(--doc-ink);
  font-size: 10px;
}

.field-review__details section p,
.overall-review-details p {
  margin: 3px 0 0;
  color: var(--doc-muted);
  font-size: 10px;
  line-height: 1.7;
}

/* ── AI Tutor: stable document companion ───────────── */
.global-mentor {
  top: 130px !important;
  height: calc(100vh - 214px) !important;
  min-height: 520px !important;
  max-height: 760px;
  border: 1px solid var(--doc-line) !important;
  border-radius: var(--doc-radius) !important;
  background: rgba(249, 250, 251, 0.96) !important;
  box-shadow: var(--doc-shadow) !important;
}

.global-mentor__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 74px;
  padding: 15px 16px !important;
  border-bottom: 0 !important;
  background: linear-gradient(135deg, #2563eb, #7c3aed) !important;
}

.global-mentor__title {
  color: #ffffff !important;
  font-size: 14px !important;
  letter-spacing: 0 !important;
}

.global-mentor__sub {
  max-width: 240px;
  color: rgba(255, 255, 255, 0.8) !important;
  font-size: 10px !important;
}

.global-mentor__badge {
  border: 1px solid rgba(255, 255, 255, 0.35) !important;
  border-radius: 999px !important;
  background: rgba(255, 255, 255, 0.15) !important;
  color: #ffffff !important;
}

.global-mentor__log {
  min-height: 0;
  padding: 14px !important;
  background: transparent !important;
  scrollbar-color: #c9ced3 transparent;
  scrollbar-width: thin;
}

.global-mentor__avatar {
  width: 26px !important;
  height: 26px !important;
  border-radius: 6px !important;
  font-size: 9px !important;
}

.global-mentor__msg--ai .global-mentor__avatar {
  background: linear-gradient(135deg, #2563eb, #7c3aed) !important;
  color: #fff !important;
}

.global-mentor__msg--student .global-mentor__avatar {
  background: linear-gradient(135deg, #10b981, #06b6d4) !important;
  color: #ffffff !important;
}

.global-mentor__bubble {
  max-width: 84% !important;
  padding: 9px 11px !important;
  border-radius: 7px !important;
  font-size: 11px !important;
  line-height: 1.72 !important;
}

.global-mentor__msg--ai .global-mentor__bubble {
  border: 1px solid var(--doc-line) !important;
  background: var(--doc-paper) !important;
  color: var(--doc-ink) !important;
}

.global-mentor__msg--student .global-mentor__bubble {
  background: linear-gradient(135deg, #2563eb, #7c3aed) !important;
  color: #ffffff !important;
}

.global-mentor__tag {
  color: var(--doc-faint) !important;
  font-size: 9px !important;
}

.global-mentor__form {
  min-height: 116px;
  padding: 12px !important;
  border-top: 1px solid var(--doc-line) !important;
  background: var(--doc-paper) !important;
}

.global-mentor__input-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.global-mentor__input-row textarea {
  flex: 1;
  min-height: 48px !important;
  max-height: 92px !important;
  background: #fbfcfc !important;
}

.global-mentor__input-row .btn-primary {
  flex-shrink: 0;
}

.global-mentor__hint {
  color: var(--doc-faint) !important;
  font-size: 9px !important;
}

/* ── Persistent bottom actions ─────────────────────── */
.bottom-bar {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 400;
  height: 58px !important;
  padding: 8px max(24px, calc((100vw - 1400px) / 2)) !important;
  border-top: 0 !important;
  background: linear-gradient(135deg, #2563eb, #7c3aed) !important;
  box-shadow: 0 -2px 8px rgba(37, 99, 235, 0.18);
}

.bottom-bar__step-info {
  color: #ffffff !important;
  font-size: 10px !important;
}

.bottom-bar .btn-secondary {
  background: rgba(255, 255, 255, 0.12) !important;
  border-color: rgba(255, 255, 255, 0.35) !important;
  color: #ffffff !important;
}

.bottom-bar .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.22) !important;
  border-color: rgba(255, 255, 255, 0.55) !important;
}

.bottom-bar .btn-ghost {
  color: #ffffff !important;
}

.bottom-bar .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12) !important;
  color: #ffffff !important;
}

.step-jump-select {
  display: none !important;
}

/* ── Motion ────────────────────────────────────────── */
#step-container {
  animation: documentary-enter 260ms var(--doc-ease) both !important;
}

@keyframes documentary-enter {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  #step-container,
  .project-sheet__panel,
  .project-sheet__backdrop {
    animation: none !important;
    transition: none !important;
  }
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 1080px) {
  .phase-navigation__phases {
    overflow-x: auto;
    grid-template-columns: repeat(6, minmax(155px, 1fr));
    scrollbar-width: none;
  }

  .phase-navigation__phases::-webkit-scrollbar {
    display: none;
  }

  .v2-workspace {
    grid-template-columns: 1fr !important;
    grid-template-rows: auto auto 1fr !important;
    padding-right: 16px !important;
    padding-left: 16px !important;
  }

  #step-container {
    grid-column: auto !important;
    grid-row: 2 !important;
  }

  #welcomeBanner-wrapper {
    grid-column: auto !important;
    grid-row: 1 !important;
  }

  #globalMentorPanel {
    grid-column: auto !important;
    grid-row: 3 !important;
    height: 560px !important;
  }

  .global-mentor {
    position: relative !important;
    top: auto !important;
    max-height: none;
  }
}

@media (max-width: 680px) {
  .topbar {
    padding: 0 12px !important;
  }

  .topbar__link {
    display: none !important;
  }

  .phase-navigation__steps {
    align-items: stretch;
    flex-direction: column;
    gap: 5px;
    padding: 7px 12px;
  }

  .phase-navigation__current-label {
    display: none;
  }

  .phase-navigation__step {
    min-width: 104px;
  }

  #welcomeBanner-wrapper {
    padding: 0 12px !important;
  }

  #welcomeBanner {
    justify-content: flex-start;
    padding: 4px 2px;
    text-align: left;
  }

  #prototypeNotice {
    text-align: left;
  }

  .project-context {
    align-items: stretch;
    flex-direction: column;
  }

  .project-context__button {
    justify-content: center;
    width: 100%;
  }

  .v2-workspace {
    padding: 12px 12px 80px !important;
  }

  #step-container > .card:first-of-type h2 {
    font-size: 22px !important;
  }

  .card__body {
    padding: 16px !important;
  }

  .bottom-bar {
    padding: 8px 12px !important;
  }

  #btnGlossary {
    display: none !important;
  }
}

[data-theme="dark"] {
  --doc-ink: #f0f2f4;
  --doc-muted: #b5bbc2;
  --doc-faint: #7d858e;
  --doc-paper: #1b1e22;
  --doc-canvas: #111316;
  --doc-line: #32363b;
  --doc-line-soft: #282c30;
  --doc-blue-soft: #142541;
  --doc-green-soft: #132c25;
}

[data-theme="dark"] body {
  background-image: none;
}

[data-theme="dark"] .topbar,
[data-theme="dark"] #stepper,
[data-theme="dark"] .bottom-bar,
[data-theme="dark"] .global-mentor,
[data-theme="dark"] .global-mentor__head,
[data-theme="dark"] .global-mentor__form {
  background: rgba(17, 19, 22, 0.92) !important;
}

[data-theme="dark"] #step-container > .card,
[data-theme="dark"] .project-context,
[data-theme="dark"] .project-sheet__item,
[data-theme="dark"] .global-mentor__msg--ai .global-mentor__bubble {
  background: var(--doc-paper) !important;
}

/* ── Non-linear research spaces ───────────────────── */
#stepper {
  display: block !important;
  padding: 0 !important;
}

.research-space-navigation {
  width: 100%;
  background: rgba(250, 251, 252, 0.94);
  border-bottom: 1px solid var(--doc-line);
  backdrop-filter: saturate(150%) blur(18px);
  -webkit-backdrop-filter: saturate(150%) blur(18px);
}

.research-space-navigation__intro {
  display: flex;
  align-items: baseline;
  gap: 12px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 8px 20px 4px;
}

.research-space-navigation__intro span {
  color: var(--doc-faint);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.research-space-navigation__intro strong {
  color: var(--doc-muted);
  font-size: 10px;
  font-weight: 600;
}

.research-space-navigation__list {
  display: none !important;
}

.research-space-tab {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: center;
  min-height: 49px;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--doc-muted);
  text-align: left;
  cursor: pointer;
  transition: background 180ms var(--doc-ease), border-color 180ms var(--doc-ease), color 180ms var(--doc-ease);
}

.research-space-tab:hover {
  background: var(--doc-paper);
  border-color: var(--doc-line);
  color: var(--doc-ink);
}

.research-space-tab--active {
  background: var(--doc-ink);
  border-color: var(--doc-ink);
  color: #fff;
}

.research-space-tab--locked,
.research-step-button--locked,
.scaffold-tool:disabled {
  cursor: not-allowed;
  opacity: 0.38;
}

.research-space-tab--locked:hover,
.research-step-button--locked:hover,
.scaffold-tool:disabled:hover {
  border-color: var(--doc-line);
  background: transparent;
  color: var(--doc-muted);
}

.research-space-tab__number {
  color: currentColor;
  font-size: 9px;
  font-weight: 800;
  opacity: 0.62;
}

.research-space-tab__copy {
  min-width: 0;
}

.research-space-tab__copy strong,
.research-space-tab__copy small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.research-space-tab__copy strong {
  font-size: 11px;
  font-weight: 800;
}

.research-space-tab__copy small {
  margin-top: 1px;
  font-size: 8px;
  opacity: 0.68;
}

.research-space-tab__record {
  position: absolute;
  top: 3px;
  right: 5px;
  color: currentColor;
  font-size: 7px;
  font-weight: 700;
  opacity: 0.52;
}

.research-space-navigation__steps {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 7px 20px 10px;
  border-top: 1px solid var(--doc-line-soft);
}

.research-space-navigation__steps-copy {
  flex: 0 0 126px;
}

.research-space-navigation__steps-copy span,
.research-space-navigation__steps-copy strong {
  display: block;
}

.research-space-navigation__steps-copy span {
  color: var(--doc-faint);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.research-space-navigation__steps-copy strong {
  margin-top: 2px;
  color: var(--doc-muted);
  font-size: 9px;
}

.research-space-navigation__step-list {
  display: flex;
  min-width: 0;
  gap: 5px;
  overflow-x: auto;
  scrollbar-width: none;
}

.research-space-navigation__step-list::-webkit-scrollbar {
  display: none;
}

.research-step-button {
  position: relative;
  display: grid;
  gap: 1px;
  flex: 0 0 auto;
  min-width: 126px;
  min-height: 43px;
  padding: 6px 10px;
  border: 1px solid var(--doc-line);
  border-radius: 5px;
  background: var(--doc-paper);
  color: var(--doc-muted);
  text-align: left;
  cursor: pointer;
}

.research-step-button:hover {
  border-color: var(--doc-ink);
  color: var(--doc-ink);
}

.research-step-button--current {
  border-color: var(--doc-blue);
  background: var(--doc-blue-soft);
  color: var(--doc-ink);
}

.research-step-button > span {
  font-size: 8px;
  font-weight: 800;
  color: var(--doc-faint);
}

.research-step-button > strong {
  font-size: 10px;
  white-space: nowrap;
}

.research-step-button > small {
  position: absolute;
  top: 4px;
  right: 5px;
  color: var(--doc-green);
  font-size: 7px;
  font-weight: 700;
}

/* ── Current research task board ───────────────────── */
#researchTaskBoard {
  width: 100%;
  max-width: 100%;
  margin-top: 10px;
  margin-left: 0;
}

.research-taskboard {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(180px, 0.55fr);
  border: 1px solid var(--doc-line);
  border-radius: 7px;
  background: var(--doc-paper);
  box-shadow: var(--doc-shadow-sm);
  overflow: hidden;
}

.research-taskboard > div {
  min-width: 0;
  padding: 13px 15px;
}

.research-taskboard > div + div {
  border-left: 1px solid var(--doc-line-soft);
}

.research-taskboard span {
  display: block;
  color: var(--doc-faint);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.research-taskboard h2 {
  margin: 4px 0 3px;
  color: var(--doc-ink);
  font-size: 15px;
  font-weight: 750;
  letter-spacing: 0;
}

.research-taskboard__tools strong {
  display: block;
  margin-top: 5px;
  color: var(--doc-ink);
  font-size: 11px;
  line-height: 1.65;
}

.research-taskboard__tool-button {
  margin-top: 8px;
  padding: 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--doc-blue);
  font: inherit;
  font-size: 9px;
  font-weight: 750;
  cursor: pointer;
}

/* ── Scaffold library sheet ────────────────────────── */
.scaffold-sheet[hidden] {
  display: none;
}

.scaffold-sheet {
  position: fixed;
  inset: 0;
  z-index: 1400;
  pointer-events: none;
}

.scaffold-sheet__backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  background: rgba(13, 16, 19, 0.28);
  opacity: 0;
  pointer-events: none;
  cursor: default;
  transition: opacity 220ms var(--doc-ease);
}

.scaffold-sheet__panel {
  position: absolute;
  top: 74px;
  left: 0;
  width: min(320px, 80vw);
  height: calc(100% - 158px);
  display: flex;
  flex-direction: row;
  border-right: 1px solid rgba(255, 255, 255, 0.3);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.85));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 24px 0 64px rgba(19, 24, 29, 0.15), 0 0 1px rgba(0, 0, 0, 0.05);
  transform: translateX(calc(-100% + 24px));
  transition: transform 260ms var(--doc-ease);
  pointer-events: auto;
  overflow: hidden;
}

.scaffold-sheet__panel:hover,
.scaffold-sheet--open .scaffold-sheet__panel {
  transform: translateX(0);
}

.scaffold-sheet-open {
  overflow: hidden;
}

.scaffold-sheet__header {
  flex-shrink: 0;
  width: 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 0;
  border: 0;
  border-right: 1px solid var(--doc-line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
  writing-mode: vertical-lr;
  cursor: pointer;
}

.scaffold-sheet__header h2 {
  margin: 0;
  color: var(--doc-ink);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.scaffold-sheet__header span,
.scaffold-sheet__header p,
.scaffold-sheet__close {
  display: none;
}

.scaffold-sheet__list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 18px 32px;
}

.scaffold-group {
  padding: 20px 0;
  border-bottom: 1px solid var(--doc-line-soft);
}

.scaffold-group > header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.scaffold-group > header > span {
  color: var(--doc-faint);
  font-size: 9px;
  font-weight: 800;
}

.scaffold-group > header strong,
.scaffold-group > header small {
  display: block;
}

.scaffold-group > header strong {
  color: var(--doc-ink);
  font-size: 14px;
}

.scaffold-group > header small {
  color: var(--doc-muted);
  font-size: 9px;
}

.scaffold-group__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.scaffold-tool {
  display: grid;
  gap: 3px;
  min-height: 72px;
  padding: 11px 12px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--doc-ink);
  text-align: left;
  cursor: pointer;
  transition: all 160ms var(--doc-ease);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.scaffold-tool:hover {
  border-color: rgba(37, 99, 235, 0.3);
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
  transform: translateY(-1px);
}

.scaffold-tool--current {
  border-color: #2563eb;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2), 0 4px 12px rgba(37, 99, 235, 0.2);
}

.scaffold-tool > span,
.scaffold-tool > small {
  color: var(--doc-faint);
  font-size: 8px;
}

.scaffold-tool > strong {
  font-size: 11px;
  line-height: 1.4;
}

.global-mentor__bubble {
  align-self: flex-start !important;
  white-space: pre-line !important;
}

@media (max-width: 900px) {
  .research-space-navigation__list {
    overflow-x: auto;
    grid-template-columns: repeat(6, minmax(142px, 1fr));
    scrollbar-width: none;
  }

  .research-taskboard {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 620px) {
  .research-space-navigation__intro {
    display: none;
  }

  .research-space-navigation__list {
    padding: 7px 12px;
  }

  .research-space-navigation__steps {
    align-items: stretch;
    flex-direction: column;
    gap: 5px;
    padding: 7px 12px 9px;
  }

  .research-space-navigation__steps-copy {
    display: none;
  }

  .research-taskboard {
    grid-template-columns: 1fr;
  }

  .research-taskboard > div + div {
    border-top: 1px solid var(--doc-line-soft);
    border-left: 0;
  }

  .research-taskboard__tools {
    grid-column: auto;
  }

  .scaffold-group__list {
    grid-template-columns: 1fr;
  }
}

[data-theme="dark"] .research-space-navigation,
[data-theme="dark"] .scaffold-sheet__header {
  background: rgba(17, 19, 22, 0.94);
}

[data-theme="dark"] .research-taskboard,
[data-theme="dark"] .scaffold-sheet__panel,
[data-theme="dark"] .scaffold-tool {
  background: var(--doc-paper);
}


.research-space-chatbot {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  align-items: center;
  min-height: 49px;
  padding: 7px 9px;
  border: 1px solid var(--doc-line);
  border-radius: 6px;
  background: var(--doc-paper);
  color: var(--doc-ink);
  text-align: left;
  cursor: pointer;
}

.research-space-chatbot:hover { border-color: var(--doc-ink); }
.research-space-chatbot__mark { font-size: 10px; font-weight: 800; }
.research-space-chatbot strong,
.research-space-chatbot small { display: block; }
.research-space-chatbot strong { font-size: 10px; }
.research-space-chatbot small { color: var(--doc-muted); font-size: 8px; margin-top: 2px; }

.research-space-navigation {
  display: none !important;
}

.research-space-navigation__toggle {
  position: absolute;
  top: 8px;
  right: 20px;
  z-index: 10;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--doc-line);
  border-radius: 6px;
  background: var(--doc-paper);
  color: var(--doc-muted);
  font-size: 11px;
  line-height: 1;
  cursor: pointer;
  transition: background 180ms var(--doc-ease), border-color 180ms var(--doc-ease), color 180ms var(--doc-ease);
}

.research-space-navigation__toggle:hover {
  border-color: var(--doc-ink);
  color: var(--doc-ink);
  background: var(--doc-bg);
}

.research-space-navigation--collapsed .research-space-navigation__intro,
.research-space-navigation--collapsed .research-space-navigation__steps,
.research-space-navigation--collapsed .research-space-tab__copy,
.research-space-navigation--collapsed .research-space-tab__record,
.research-space-navigation--collapsed .research-space-chatbot > span:last-child {
  display: none;
}

.research-space-navigation--collapsed .research-space-navigation__list {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 6px 20px;
  grid-template-columns: none;
}

.research-space-navigation--collapsed .research-space-tab,
.research-space-navigation--collapsed .research-space-chatbot {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
  width: 38px;
  height: 34px;
  padding: 4px;
  grid-template-columns: none;
}

.research-space-navigation--collapsed .research-space-tab__number,
.research-space-navigation--collapsed .research-space-chatbot__mark {
  font-size: 11px;
}

.chatbot-page {
  position: fixed;
  inset: 0;
  z-index: 3000;
  overflow: auto;
  background: var(--doc-canvas, #f4f4f2);
}
.chatbot-page[hidden] { display: none; }
.chatbot-page__shell { width: min(920px, calc(100% - 32px)); margin: 0 auto; padding: 28px 0; }
.chatbot-page__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  padding: 20px 0 18px;
  border-bottom: 1px solid var(--doc-line);
}
.chatbot-page__header span { color: var(--doc-faint); font-size: 9px; font-weight: 800; letter-spacing: .12em; }
.chatbot-page__header h1 { margin: 6px 0; font-size: clamp(24px, 4vw, 40px); letter-spacing: 0; }
.chatbot-page__header p { margin: 0; color: var(--doc-muted); font-size: 13px; }
.chatbot-page__close { border: 1px solid var(--doc-line); border-radius: 6px; background: var(--doc-paper); padding: 9px 12px; cursor: pointer; }
.chatbot-page__conversation { padding-top: 18px; }
.chatbot-page__log {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 360px;
  max-height: calc(100vh - 300px);
  overflow-y: auto;
  padding: 16px;
  border: 1px solid var(--doc-line);
  border-radius: 6px;
  background: var(--doc-paper);
}
.chatbot-message { width: min(76%, 640px); padding: 12px 14px; border-radius: 6px; white-space: pre-wrap; line-height: 1.65; }
.chatbot-message--ai { align-self: flex-start; border: 1px solid var(--doc-line); background: var(--doc-canvas, #f7f7f5); }
.chatbot-message--student { align-self: flex-end; background: var(--doc-ink); color: #fff; }
.chatbot-message__author { display: block; margin-bottom: 5px; font-size: 9px; font-weight: 800; }
.chatbot-message small { display: block; margin-top: 7px; color: var(--doc-muted); font-size: 9px; }
.chatbot-page__empty { margin: auto; color: var(--doc-muted); text-align: center; }
.chatbot-page__composer { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin-top: 12px; align-items: end; }
.chatbot-page__composer textarea { min-height: 82px; resize: vertical; }
.chatbot-page__composer button { min-width: 88px; }
.chatbot-page__policy { margin: 8px 0 0; color: var(--doc-muted); font-size: 10px; }
body.chatbot-page-open { overflow: hidden; }

.ai-chatbot-launcher {
  position: fixed;
  z-index: 500;
  bottom: 80px;
  right: max(24px, calc((100vw - 1400px) / 2 + 24px));
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  color: #fff;
  font: inherit;
  font-size: 9px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
  transition: background 180ms var(--doc-ease), color 180ms var(--doc-ease), transform 180ms var(--doc-ease), box-shadow 180ms var(--doc-ease);
}

.ai-chatbot-launcher:hover {
  color: #fff;
  background: linear-gradient(135deg, #ec4899, #f59e0b);
  transform: translateY(-2px);
}

.ai-chatbot-launcher__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: auto;
  height: auto;
  border-radius: 0;
  background: transparent;
  color: inherit;
  font-size: 10px;
  font-weight: 800;
}

.ai-chatbot-launcher__copy {
  display: none;
}

@media (max-width: 620px) {
  .ai-chatbot-launcher { 
    width: 36px;
    height: 36px;
  }
  .chatbot-page__shell { width: calc(100% - 24px); padding: 12px 0; }
  .chatbot-page__header { display: block; }
  .chatbot-page__close { margin-top: 12px; }
  .chatbot-page__log { max-height: calc(100vh - 310px); }
  .chatbot-message { width: 88%; }
  .chatbot-page__composer { grid-template-columns: 1fr; }
}