/* ============================================================
   Kandeur tutor · visual layer
   Sits on top of the app's violet design system. Type, color,
   radii and elevation all resolve from the shared :root tokens
   so the tutor reads as part of the same product.
   ============================================================ */

:root {
  /* inherited palette, aliased so tutor rules stay readable */
  --tutor-ink: var(--ink);
  --tutor-ink-soft: var(--ink-soft);
  --tutor-muted: var(--muted);
  --tutor-line: var(--line);
  --tutor-line-strong: var(--line-strong);
  --tutor-brand: var(--brand);
  --tutor-brand-strong: var(--brand-strong);
  --tutor-brand-mid: var(--brand-mid);
  --tutor-brand-light: var(--brand-light);
  --tutor-brand-soft: var(--brand-soft);
  --tutor-brand-whisper: var(--brand-whisper);

  --tutor-paper: #ffffff;
  --tutor-paper-soft: #faf8fe;
  --tutor-paper-lavender: #f4effc;

  --tutor-ok: var(--ok);
  --tutor-ok-soft: #e9f7f0;
  --tutor-ok-line: #b9dccd;
  --tutor-warn: var(--danger);
  --tutor-warn-soft: #fdf3e5;
  --tutor-warn-line: #ecd3a2;

  --tutor-font-brand: var(--brand-font);
  --tutor-font-display: var(--serif);
  --tutor-font-body: var(--sans);
  --tutor-font-data: var(--mono);

  --tutor-radius-panel: 40px;
  --tutor-radius-card: 20px;
  --tutor-radius-field: 18px;
  --tutor-radius-pill: 999px;

  --tutor-shadow-lift: 0 10px 28px rgba(29, 19, 51, 0.08);
  --tutor-shadow-card: 0 1px 2px rgba(29, 19, 51, 0.04), 0 8px 20px rgba(29, 19, 51, 0.05);
  --tutor-shadow-panel: 0 32px 90px rgba(29, 19, 51, 0.18), 0 2px 6px rgba(29, 19, 51, 0.05);

  --tutor-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --tutor-dur-fast: 160ms;
  --tutor-dur-med: 280ms;
}

html,
body {
  overflow-x: clip;
}

::selection {
  background: var(--tutor-brand-soft);
  color: var(--tutor-ink);
}

.ai-tutor-root {
  font-family: var(--tutor-font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.ai-tutor-root *,
.ai-tutor-root *::before,
.ai-tutor-root *::after {
  box-sizing: border-box;
}

/* ------------------------------------------------------------
   Launcher
   ------------------------------------------------------------ */
.ai-tutor-launcher {
  position: fixed;
  right: 24px;
  bottom: 24px;
  min-height: 56px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px 8px 10px;
  border: 1px solid rgba(157, 122, 227, 0.42);
  border-radius: var(--tutor-radius-pill);
  background: linear-gradient(135deg, #1d1333 0%, #2b1b4e 55%, #3a2368 100%);
  color: #fff;
  box-shadow: 0 18px 44px rgba(29, 19, 51, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  font: 800 0.95rem/1 var(--tutor-font-body);
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.ai-tutor-launcher:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 56px rgba(29, 19, 51, 0.34), 0 0 0 4px rgba(102, 48, 201, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.ai-tutor-launcher:active {
  transform: translateY(0);
}

.ai-tutor-launcher__mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--tutor-radius-pill);
  background: linear-gradient(135deg, #7b4cdb 0%, #6630c9 58%, #5022a5 100%);
  color: #fff;
  font: 400 1.02rem/0.9 var(--tutor-font-brand);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.ai-selection-popover {
  position: fixed;
  left: var(--selection-x, 24px);
  top: var(--selection-y, 24px);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border: 1px solid rgba(157, 122, 227, 0.4);
  border-radius: var(--tutor-radius-pill);
  background: linear-gradient(135deg, #1d1333, #3a2368);
  color: #fff;
  box-shadow: 0 18px 42px rgba(29, 19, 51, 0.28);
  font: 800 0.82rem/1 var(--tutor-font-body);
  animation: tutor-pop 0.2s var(--tutor-ease);
}

.ai-selection-popover::before {
  content: "K";
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
  color: #d8ccf8;
  font: 400 0.68rem/1 var(--tutor-font-brand);
}

/* ------------------------------------------------------------
   Panel shell
   ------------------------------------------------------------ */
.ai-tutor-panel {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: min(37rem, calc(100vw - 2rem));
  height: min(48rem, calc(100dvh - 3rem));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-panel);
  background: var(--tutor-paper);
  color: var(--tutor-ink);
  box-shadow: var(--tutor-shadow-panel), inset 0 1px 0 rgba(255, 255, 255, 0.9);
  animation: tutor-enter 0.32s var(--tutor-ease);
}

.ai-tutor-panel > * {
  flex: 0 0 auto;
}

.ai-tutor-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px 14px;
  background: var(--tutor-paper);
}

.ai-tutor-title {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.ai-tutor-title__eyebrow {
  color: var(--tutor-brand);
  font: 700 0.66rem/1 var(--tutor-font-data);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.ai-tutor-title strong {
  color: var(--tutor-brand);
  font: 400 1.55rem/0.95 var(--tutor-font-brand);
  letter-spacing: 0.015em;
}

.ai-tutor-title span {
  display: none;
}

.ai-tutor-close {
  position: relative;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-paper);
  color: var(--tutor-ink);
  font-size: 0;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease);
}

.ai-tutor-close::before {
  content: "✕";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0.95rem;
  font-weight: 800;
}

.ai-tutor-close:hover {
  transform: rotate(90deg);
  border-color: var(--tutor-line-strong);
  background: var(--tutor-brand-whisper);
}

/* context strip */
.ai-tutor-context {
  display: grid;
  gap: 10px;
  padding: 9px 24px 11px;
  border-bottom: 1px solid var(--tutor-line);
  background: linear-gradient(90deg, var(--tutor-brand-whisper), rgba(255, 255, 255, 0.9));
}

.ai-tutor-context__line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--tutor-ink-soft);
  font: 700 0.8rem/1.35 var(--tutor-font-body);
  min-width: 0;
}

.ai-tutor-context__line > span:first-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-tutor-context__status {
  flex: 0 0 auto;
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  border: 1px solid var(--tutor-warn-line);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-warn-soft);
  color: var(--tutor-warn);
  font: 700 0.64rem/1 var(--tutor-font-data);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.ai-tutor-context__status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.ai-tutor-context__status.is-ready {
  border-color: var(--tutor-ok-line);
  background: var(--tutor-ok-soft);
  color: var(--tutor-ok);
}

.ai-tutor-selection {
  padding: 10px 14px;
  border: 1px solid #d9c9f4;
  border-radius: 16px;
  background: var(--tutor-brand-whisper);
  color: var(--tutor-ink-soft);
  font-size: 0.84rem;
  line-height: 1.5;
}

.ai-tutor-selection strong {
  display: block;
  margin-bottom: 4px;
  color: var(--tutor-brand);
  font: 700 0.64rem/1 var(--tutor-font-data);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* subject strip */
.tt-subjectbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 24px;
  border-bottom: 1px solid var(--tutor-line);
  background: var(--tutor-paper);
}

.tt-subjectbar__label {
  flex: 0 0 auto;
  color: var(--tutor-muted);
  font: 700 0.64rem/1 var(--tutor-font-data);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tt-subjectbar strong {
  flex: 1;
  min-width: 0;
  color: var(--tutor-ink);
  font: 800 0.9rem/1.3 var(--tutor-font-body);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tt-subjectbar__select {
  flex: 1;
  min-width: 0;
  height: 38px;
  padding: 0 32px 0 12px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-paper);
  color: var(--tutor-ink);
  font: 700 0.84rem/1 var(--tutor-font-body);
  outline: none;
}

.tt-subjectbar__manage {
  flex: 0 0 auto;
}

/* mode segmented control */
.tt-modebar {
  display: flex;
  gap: 4px;
  margin: 12px 24px;
  padding: 4px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-paper-soft);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.85);
}

.tt-mode {
  flex: 1 1 0;
  min-width: 0;
  min-height: 40px;
  padding: 0 10px;
  border: 0;
  border-radius: var(--tutor-radius-pill);
  background: transparent;
  color: var(--tutor-ink-soft);
  font: 700 0.82rem/1 var(--tutor-font-body);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background var(--tutor-dur-fast) var(--tutor-ease),
    color var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-mode:hover {
  color: var(--tutor-ink);
}

.tt-mode::after {
  display: none;
}

.tt-mode.is-active {
  background: var(--tutor-ink);
  color: #fff;
  box-shadow: 0 8px 20px rgba(29, 19, 51, 0.18);
}

/* ------------------------------------------------------------
   Conversation
   ------------------------------------------------------------ */
.ai-tutor-messages {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 24px;
  background: radial-gradient(1100px 420px at 12% -8%, rgba(216, 204, 248, 0.4), transparent 60%),
    linear-gradient(180deg, var(--tutor-paper-soft), #f5f1fb);
  scrollbar-color: var(--tutor-line-strong) transparent;
}

.ai-tutor-message {
  max-width: 86%;
  padding: 13px 16px;
  font: 400 0.94rem/1.6 var(--tutor-font-body);
  overflow-wrap: anywhere;
}

.ai-tutor-message strong {
  font-weight: 700;
}

.ai-tutor-message[data-role="user"] {
  align-self: flex-end;
  border-radius: 22px 22px 8px 22px;
  background: linear-gradient(135deg, #1d1333, #3a2368);
  color: #fdfcff;
  box-shadow: 0 10px 24px rgba(29, 19, 51, 0.16);
}

.ai-tutor-message[data-role="assistant"] {
  position: relative;
  align-self: flex-start;
  padding: 14px 16px 14px 56px;
  border: 1px solid var(--tutor-line);
  border-radius: 22px 22px 22px 8px;
  background: var(--tutor-paper);
  color: var(--tutor-ink-soft);
  box-shadow: var(--tutor-shadow-card);
}

.ai-tutor-message[data-role="assistant"]::before {
  content: "K";
  position: absolute;
  left: 14px;
  top: 15px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--tutor-brand-mid), var(--tutor-brand));
  color: #fff;
  font: 400 0.8rem/1 var(--tutor-font-brand);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.ai-tutor-message mjx-container {
  font-size: 104% !important;
}

.ai-tutor-typing {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-paper);
  color: var(--tutor-muted);
  font: 600 0.76rem/1 var(--tutor-font-data);
  box-shadow: var(--tutor-shadow-card);
}

.ai-tutor-typing::after {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 8px 0 0 currentColor, 16px 0 0 currentColor;
  animation: tutor-dots 1.1s var(--tutor-ease) infinite;
}

.ai-tutor-empty {
  margin: auto;
  width: 100%;
  max-width: 430px;
  padding: 26px 24px 24px;
  border: 1px solid var(--tutor-line);
  border-radius: 28px;
  background: radial-gradient(430px 190px at 50% -24%, rgba(216, 204, 248, 0.55), transparent 72%),
    var(--tutor-paper);
  box-shadow: 0 18px 44px rgba(29, 19, 51, 0.07);
  display: grid;
  gap: 10px;
}

.ai-tutor-empty::before {
  content: "K";
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--tutor-brand-mid), var(--tutor-brand));
  color: #fff;
  font: 400 1.05rem/1 var(--tutor-font-brand);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22), 0 8px 18px rgba(102, 48, 201, 0.2);
}

.ai-tutor-empty strong {
  color: var(--tutor-ink);
  font: 650 1.22rem/1.2 var(--tutor-font-display);
  letter-spacing: 0;
}

.ai-tutor-empty p {
  margin: 0;
  color: var(--tutor-ink-soft);
}

.ai-tutor-empty__hint {
  color: var(--tutor-muted);
  font: 600 0.76rem/1.45 var(--tutor-font-body);
}

/* ------------------------------------------------------------
   Composer
   The JS renders the prompts block and the input row as direct
   children of the panel, so they carry the white composer band.
   ------------------------------------------------------------ */
.ai-tutor-prompts-wrap {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: 14px 24px 0;
  border-top: 1px solid var(--tutor-line);
  background: var(--tutor-paper);
}

.ai-tutor-prompts-label {
  color: var(--tutor-muted);
  font: 700 0.64rem/1 var(--tutor-font-data);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.ai-tutor-prompts {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 2px 4px;
  scrollbar-width: none;
}

.ai-tutor-prompts::-webkit-scrollbar {
  display: none;
}

.ai-tutor-prompts button {
  flex: 0 0 auto;
  max-width: 240px;
  display: grid;
  gap: 3px;
  align-content: center;
  justify-items: start;
  padding: 10px 14px;
  border: 1px solid var(--tutor-line);
  border-radius: 18px;
  background: var(--tutor-paper);
  text-align: left;
  white-space: normal;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.ai-tutor-prompts button:hover {
  transform: translateY(-1px);
  border-color: var(--tutor-brand-light);
  background: var(--tutor-brand-whisper);
  box-shadow: var(--tutor-shadow-lift);
}

.ai-tutor-prompt__eyebrow {
  color: var(--tutor-brand);
  font: 700 0.62rem/1 var(--tutor-font-data);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.ai-tutor-prompt__title {
  color: var(--tutor-ink);
  font: 800 0.84rem/1.3 var(--tutor-font-body);
  text-wrap: pretty;
}

.ai-tutor-input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: end;
  margin: 12px 24px 20px;
  padding: 6px 6px 6px 16px;
  border: 1px solid var(--tutor-line);
  border-radius: 22px;
  background: #fff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
  transition: border-color var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.ai-tutor-input-row:focus-within {
  border-color: rgba(102, 48, 201, 0.55);
  box-shadow: 0 0 0 4px rgba(102, 48, 201, 0.12);
}

.ai-tutor-input-row textarea {
  width: 100%;
  min-height: 44px;
  max-height: 150px;
  resize: none;
  padding: 8px 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--tutor-ink);
  font: 600 0.95rem/1.45 var(--tutor-font-body);
}

.ai-tutor-input-row textarea::placeholder {
  color: #a29ab4;
  font-weight: 600;
}

.ai-tutor-input-row textarea:focus {
  outline: none;
}

.ai-tutor-send {
  min-height: 46px;
  min-width: 88px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 16px;
  border: 0;
  border-radius: var(--tutor-radius-pill);
  background: linear-gradient(135deg, var(--tutor-ink), #3a2368);
  color: #fff;
  font: 800 0.88rem/1 var(--tutor-font-body);
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease);
}

.ai-tutor-send::after {
  content: "↑";
  font-size: 1.05em;
  line-height: 1;
}

.ai-tutor-send:hover {
  transform: translateY(-1px);
  background: linear-gradient(135deg, var(--tutor-brand), var(--tutor-brand-strong));
  box-shadow: 0 12px 24px rgba(102, 48, 201, 0.28);
}

.ai-tutor-send:active {
  transform: translateY(1px);
}

/* ------------------------------------------------------------
   Shared controls
   ------------------------------------------------------------ */
.tt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--tutor-ink);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-ink);
  color: #fff;
  font: 800 0.86rem/1 var(--tutor-font-body);
  white-space: nowrap;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-btn:hover {
  transform: translateY(-1px);
  border-color: var(--tutor-brand);
  background: var(--tutor-brand);
  box-shadow: 0 12px 24px rgba(102, 48, 201, 0.25);
}

.tt-btn:active {
  transform: translateY(1px);
}

.tt-btn--ghost {
  border-color: var(--tutor-line-strong);
  background: var(--tutor-paper);
  color: var(--tutor-ink);
}

.tt-btn--ghost:hover {
  border-color: var(--tutor-brand-light);
  background: var(--tutor-brand-whisper);
  color: var(--tutor-brand-strong);
  box-shadow: var(--tutor-shadow-lift);
}

.tt-btn--block {
  width: 100%;
}

.tt-btn:disabled,
.tt-chip:disabled,
.tt-mode:disabled,
.tt-style:disabled,
.tt-onboard__subject:disabled,
.tt-practice__option:disabled,
.ai-tutor-send:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
}

.tt-chip-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tt-chip {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-paper);
  color: var(--tutor-ink-soft);
  font: 700 0.84rem/1 var(--tutor-font-body);
  white-space: nowrap;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease),
    color var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-chip:hover {
  border-color: var(--tutor-brand-light);
  transform: translateY(-1px);
}

.tt-chip.is-active {
  border-color: var(--tutor-brand);
  background: var(--tutor-brand);
  color: #fff;
  box-shadow: 0 8px 18px rgba(102, 48, 201, 0.24);
}

.tt-field-group {
  display: grid;
  gap: 8px;
}

.tt-field-label {
  color: var(--tutor-ink-soft);
  font: 700 0.8rem/1.3 var(--tutor-font-body);
}

.tt-field-help {
  color: var(--tutor-muted);
  font: 400 0.76rem/1.45 var(--tutor-font-body);
}

.tt-field {
  width: 100%;
  min-height: 48px;
  padding: 0 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-field);
  background: var(--tutor-paper);
  color: var(--tutor-ink);
  font: 600 0.92rem/1 var(--tutor-font-body);
  outline: 2px solid transparent;
  outline-offset: 1px;
  transition: border-color var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-field:focus-visible {
  border-color: rgba(102, 48, 201, 0.55);
  outline-color: rgba(102, 48, 201, 0.16);
  box-shadow: 0 0 0 4px rgba(102, 48, 201, 0.12);
}

/* ------------------------------------------------------------
   Onboarding
   ------------------------------------------------------------ */
.tt-onboard {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 24px 28px;
}

.tt-onboard__progress {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}

.tt-onboard__progress span {
  height: 4px;
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-line);
  transition: background var(--tutor-dur-med) var(--tutor-ease);
}

.tt-onboard__progress span.is-done {
  background: linear-gradient(90deg, var(--tutor-brand), var(--tutor-brand-mid));
}

.tt-onboard__heading {
  color: var(--tutor-ink);
  font: 650 1.3rem/1.25 var(--tutor-font-display);
  letter-spacing: 0;
  text-wrap: balance;
}

.tt-onboard__heading--sm {
  margin-top: 6px;
  font-size: 1.02rem;
}

.tt-onboard__copy {
  margin: 0;
  color: var(--tutor-ink-soft);
  font: 400 0.92rem/1.6 var(--tutor-font-body);
}

.tt-onboard__search {
  display: grid;
  gap: 7px;
}

.tt-onboard__search input {
  width: 100%;
  min-height: 48px;
  padding: 0 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-paper);
  color: var(--tutor-ink);
  font: 600 0.92rem/1 var(--tutor-font-body);
  outline: 2px solid transparent;
  outline-offset: 1px;
  transition: border-color var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-onboard__search input:focus-visible {
  border-color: rgba(102, 48, 201, 0.55);
  outline-color: rgba(102, 48, 201, 0.16);
  box-shadow: 0 0 0 4px rgba(102, 48, 201, 0.12);
}

.tt-onboard__search input::placeholder {
  color: #a29ab4;
}

.tt-onboard__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 320px;
  overflow-y: auto;
  padding: 2px;
  scrollbar-color: var(--tutor-line-strong) transparent;
}

.tt-onboard__subject {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-rows: auto auto;
  column-gap: 12px;
  align-items: center;
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
  text-align: left;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-onboard__subject::after {
  content: "→";
  grid-column: 2;
  grid-row: 1 / span 2;
  color: var(--tutor-brand);
  font: 800 0.95rem/1 var(--tutor-font-body);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--tutor-dur-fast) var(--tutor-ease),
    transform var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-onboard__subject:hover {
  transform: translateY(-1px);
  border-color: var(--tutor-brand-light);
  background: var(--tutor-brand-whisper);
  box-shadow: var(--tutor-shadow-lift);
}

.tt-onboard__subject:hover::after {
  opacity: 1;
  transform: none;
}

.tt-onboard__subject strong {
  color: var(--tutor-ink);
  font: 800 0.92rem/1.25 var(--tutor-font-body);
}

.tt-onboard__subject span {
  margin-top: 2px;
  color: var(--tutor-muted);
  font: 600 0.68rem/1.35 var(--tutor-font-data);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tt-style-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.tt-style {
  position: relative;
  min-height: 96px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  padding: 12px 14px 12px 48px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
  text-align: left;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-style::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 13px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: var(--tutor-brand-whisper);
  color: var(--tutor-brand);
  font: 700 0.7rem/1 var(--tutor-font-data);
  transition: background var(--tutor-dur-fast) var(--tutor-ease),
    color var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-style:nth-child(1)::before { content: "Aa"; }
.tt-style:nth-child(2)::before { content: "1·2"; }
.tt-style:nth-child(3)::before { content: "◐"; }
.tt-style:nth-child(4)::before { content: "§"; }
.tt-style:nth-child(5)::before { content: "∑"; }

.tt-style:hover {
  transform: translateY(-1px);
  border-color: var(--tutor-brand-light);
  box-shadow: var(--tutor-shadow-lift);
}

.tt-style strong {
  color: var(--tutor-ink);
  font: 800 0.9rem/1.25 var(--tutor-font-body);
}

.tt-style span {
  color: var(--tutor-muted);
  font: 400 0.76rem/1.4 var(--tutor-font-body);
}

.tt-style.is-active {
  border-color: var(--tutor-brand);
  background: var(--tutor-brand-whisper);
  box-shadow: inset 0 0 0 1px var(--tutor-brand);
}

.tt-style.is-active::before {
  background: var(--tutor-brand);
  color: #fff;
}

.tt-style.is-active strong {
  color: var(--tutor-brand);
}

.tt-onboard__nav {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--tutor-line);
}

.tt-onboard__footer {
  display: flex;
  justify-content: flex-end;
  padding: 12px 24px 16px;
  border-top: 1px solid var(--tutor-line);
  background: var(--tutor-paper);
}

.tt-placement {
  display: grid;
  gap: 14px;
  padding: 4px 0;
}

.tt-placement__meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--tutor-muted);
  font: 700 0.68rem/1.3 var(--tutor-font-data);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tt-placement__prompt {
  color: var(--tutor-ink);
  font: 650 1.15rem/1.45 var(--tutor-font-display);
}

/* ------------------------------------------------------------
   Practice
   ------------------------------------------------------------ */
.tt-practice {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 22px 24px 28px;
}

.tt-practice__meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--tutor-muted);
  font: 700 0.68rem/1.4 var(--tutor-font-data);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tt-practice__prompt {
  color: var(--tutor-ink);
  font: 650 1.18rem/1.45 var(--tutor-font-display);
  overflow-wrap: anywhere;
}

.tt-practice__options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tt-practice__option {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
  text-align: left;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    background var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-practice__option:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: var(--tutor-brand-light);
  background: var(--tutor-brand-whisper);
  box-shadow: var(--tutor-shadow-lift);
}

.tt-practice__letter {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: var(--tutor-brand-whisper);
  color: var(--tutor-brand);
  font: 800 0.78rem/1 var(--tutor-font-data);
}

.tt-practice__choice {
  color: var(--tutor-ink-soft);
  font: 500 0.92rem/1.5 var(--tutor-font-body);
}

.tt-practice__state {
  font-weight: 800;
}

.tt-practice__option.is-correct {
  border-color: var(--tutor-ok-line);
  background: var(--tutor-ok-soft);
}

.tt-practice__option.is-correct .tt-practice__letter {
  background: var(--tutor-ok);
  color: #fff;
}

.tt-practice__option.is-correct .tt-practice__state {
  color: var(--tutor-ok);
}

.tt-practice__option.is-wrong {
  border-color: var(--tutor-warn-line);
  background: var(--tutor-warn-soft);
}

.tt-practice__option.is-wrong .tt-practice__letter {
  background: var(--tutor-warn);
  color: #fff;
}

.tt-practice__option.is-wrong .tt-practice__state {
  color: var(--tutor-warn);
}

.tt-practice__option.is-dim {
  opacity: 0.5;
}

.tt-practice__option.is-selected {
  border-color: var(--tutor-brand);
  box-shadow: inset 0 0 0 1px var(--tutor-brand);
}

.tt-practice__hint {
  padding: 14px 16px;
  border: 1px solid #e0d2f7;
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-brand-whisper);
  color: var(--tutor-ink-soft);
  font: 400 0.86rem/1.55 var(--tutor-font-body);
}

.tt-practice__hint strong {
  display: block;
  margin-bottom: 6px;
  color: var(--tutor-brand);
  font: 800 0.64rem/1 var(--tutor-font-data);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tt-practice__hint-limit {
  color: var(--tutor-muted);
  font: 600 0.8rem/1.45 var(--tutor-font-body);
  overflow-wrap: anywhere;
}

.tt-practice__confidence,
.tt-practice__selfgrade {
  display: grid;
  gap: 8px;
  color: var(--tutor-ink-soft);
  font: 700 0.8rem/1.3 var(--tutor-font-body);
}

.tt-practice__card-actions,
.tt-practice__next {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tt-practice__answer {
  padding: 14px 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
  color: var(--tutor-ink-soft);
  font: 400 0.9rem/1.6 var(--tutor-font-body);
}

.tt-practice__result {
  padding: 14px 16px;
  border-radius: var(--tutor-radius-card);
}

.tt-practice__result.is-correct {
  border: 1px solid var(--tutor-ok-line);
  background: var(--tutor-ok-soft);
}

.tt-practice__result.is-wrong {
  border: 1px solid var(--tutor-warn-line);
  background: var(--tutor-warn-soft);
}

.tt-practice__result-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.tt-practice__result-head strong {
  font: 800 0.92rem/1.2 var(--tutor-font-body);
}

.tt-practice__result.is-correct .tt-practice__result-head strong {
  color: var(--tutor-ok);
}

.tt-practice__result.is-wrong .tt-practice__result-head strong {
  color: var(--tutor-warn);
}

.tt-practice__result-head span {
  color: var(--tutor-muted);
  font: 700 0.68rem/1.3 var(--tutor-font-data);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tt-practice__result-body {
  color: var(--tutor-ink-soft);
  font: 400 0.88rem/1.55 var(--tutor-font-body);
}

.tt-practice__error {
  color: var(--tutor-warn);
  font: 600 0.8rem/1.45 var(--tutor-font-body);
}

/* ------------------------------------------------------------
   Lesson
   ------------------------------------------------------------ */
.tt-lesson {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 24px 28px;
}

.tt-lesson__head {
  display: grid;
  gap: 6px;
}

.tt-lesson__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.tt-lesson__subject,
.tt-lesson__label {
  color: var(--tutor-muted);
  font: 700 0.66rem/1.3 var(--tutor-font-data);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tt-lesson__label {
  color: var(--tutor-brand);
}

.tt-lesson__topic {
  color: var(--tutor-ink);
  font: 650 1.22rem/1.3 var(--tutor-font-display);
}

.tt-lesson__bar {
  height: 6px;
  border-radius: var(--tutor-radius-pill);
  background: var(--tutor-line);
  overflow: hidden;
}

.tt-lesson__bar-fill {
  height: 100%;
  border-radius: var(--tutor-radius-pill);
  background: linear-gradient(90deg, var(--tutor-brand), var(--tutor-brand-mid));
}

.tt-lesson__content {
  color: var(--tutor-ink-soft);
  font: 400 0.94rem/1.65 var(--tutor-font-body);
  overflow-wrap: anywhere;
}

.tt-lesson__content strong {
  color: var(--tutor-ink);
}

.tt-lesson__diagnosis {
  padding: 12px 16px;
  border: 1px solid var(--tutor-brand-soft);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-brand-whisper);
  color: var(--tutor-ink);
  font: 650 0.84rem/1.5 var(--tutor-font-body);
}

.tt-lesson__independent {
  padding: 14px 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper-soft);
  color: var(--tutor-ink-soft);
  font: 600 0.86rem/1.5 var(--tutor-font-body);
}

.tt-lesson__actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tt-lesson__teach-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  border: 0;
  background: transparent;
  color: var(--tutor-brand);
  font: 700 0.78rem/1.3 var(--tutor-font-body);
}

.tt-lesson__teach-link::before {
  content: "→";
  transition: transform var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-lesson__teach-link:hover::before {
  transform: translateX(2px);
}

/* free answer + worked examples */
.tt-freeanswer {
  display: grid;
  gap: 8px;
}

.tt-freeanswer textarea {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  padding: 12px 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-field);
  background: var(--tutor-paper);
  color: var(--tutor-ink);
  font: 600 0.92rem/1.5 var(--tutor-font-body);
  outline: 2px solid transparent;
  outline-offset: 1px;
}

.tt-freeanswer textarea:focus-visible {
  border-color: rgba(102, 48, 201, 0.55);
  outline-color: rgba(102, 48, 201, 0.16);
  box-shadow: 0 0 0 4px rgba(102, 48, 201, 0.12);
}

.tt-freeanswer__prompt {
  color: var(--tutor-ink);
  font: 650 1.05rem/1.4 var(--tutor-font-display);
}

.tt-example__steps {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: tutor-step;
}

.tt-example__step {
  position: relative;
  padding: 12px 14px 12px 46px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
  color: var(--tutor-ink-soft);
  font: 400 0.88rem/1.55 var(--tutor-font-body);
  counter-increment: tutor-step;
}

.tt-example__step::before {
  content: counter(tutor-step);
  position: absolute;
  left: 12px;
  top: 12px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--tutor-brand-whisper);
  color: var(--tutor-brand);
  font: 800 0.72rem/1 var(--tutor-font-data);
}

.tt-example__step.is-gap,
.tt-example__step.is-correct {
  border-color: var(--tutor-brand-soft);
  background: var(--tutor-brand-whisper);
}

.tt-example__step strong {
  color: var(--tutor-brand);
}

/* ------------------------------------------------------------
   Review
   ------------------------------------------------------------ */
.tt-review {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 24px 28px;
}

.tt-review__count {
  color: var(--tutor-muted);
  font: 700 0.68rem/1.3 var(--tutor-font-data);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tt-review__item {
  display: grid;
  gap: 8px;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
  text-align: left;
  transition: transform var(--tutor-dur-fast) var(--tutor-ease),
    border-color var(--tutor-dur-fast) var(--tutor-ease),
    box-shadow var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-review__item:hover {
  transform: translateY(-1px);
  border-color: var(--tutor-brand-light);
  box-shadow: var(--tutor-shadow-lift);
}

.tt-review__item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.tt-review__item-head strong {
  color: var(--tutor-ink);
  font: 800 0.9rem/1.3 var(--tutor-font-body);
}

.tt-review__item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  color: var(--tutor-muted);
  font: 600 0.68rem/1.4 var(--tutor-font-data);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.tt-review__mis {
  padding: 8px 12px;
  border-radius: 12px;
  background: var(--tutor-warn-soft);
  color: var(--tutor-warn);
  font: 500 0.8rem/1.45 var(--tutor-font-body);
}

.tt-review__item-actions {
  display: flex;
  padding-left: 2px;
}

.tt-mastery {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 24px;
  padding: 0 10px;
  border-radius: var(--tutor-radius-pill);
  font: 700 0.64rem/1 var(--tutor-font-data);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.tt-mastery.is-new {
  border: 1px solid var(--tutor-line);
  background: var(--tutor-paper-soft);
  color: var(--tutor-muted);
}

.tt-mastery.is-mid {
  background: var(--tutor-brand-whisper);
  color: var(--tutor-brand);
}

.tt-mastery.is-strong {
  background: var(--tutor-ok-soft);
  color: var(--tutor-ok);
}

/* ------------------------------------------------------------
   Study plan
   ------------------------------------------------------------ */
.tt-plan {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 24px 28px;
}

.tt-plan__head {
  display: grid;
  gap: 4px;
}

.tt-plan__head strong {
  color: var(--tutor-ink);
  font: 650 1.16rem/1.3 var(--tutor-font-display);
}

.tt-plan__head span {
  color: var(--tutor-muted);
  font: 700 0.68rem/1.3 var(--tutor-font-data);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tt-plan__week {
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
  overflow: hidden;
}

.tt-plan__week summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  color: var(--tutor-ink);
  font: 800 0.9rem/1.3 var(--tutor-font-body);
  list-style: none;
}

.tt-plan__week summary::-webkit-details-marker {
  display: none;
}

.tt-plan__week summary::after {
  content: "+";
  color: var(--tutor-brand);
  font: 700 1rem/1 var(--tutor-font-data);
  transition: transform var(--tutor-dur-med) var(--tutor-ease);
}

.tt-plan__week[open] summary::after {
  transform: rotate(45deg);
}

.tt-plan__week summary span {
  color: var(--tutor-muted);
  font: 600 0.68rem/1.3 var(--tutor-font-data);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tt-plan__topics {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0 10px 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--tutor-line);
}

.tt-plan__topic {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 10px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  text-align: left;
  color: var(--tutor-ink-soft);
  font: 600 0.84rem/1.35 var(--tutor-font-body);
  transition: background var(--tutor-dur-fast) var(--tutor-ease),
    color var(--tutor-dur-fast) var(--tutor-ease);
}

.tt-plan__topic:hover {
  background: var(--tutor-brand-whisper);
  color: var(--tutor-ink);
}

.tt-plan__topic.is-focus {
  background: var(--tutor-brand-whisper);
  color: var(--tutor-brand-strong);
  font-weight: 800;
}

.tt-plan__topic-level {
  flex: 0 0 auto;
  color: var(--tutor-muted);
  font: 600 0.66rem/1.3 var(--tutor-font-data);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ------------------------------------------------------------
   Subject manager
   ------------------------------------------------------------ */
.tt-subject-manager {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 20px 24px 28px;
}

.tt-subject-manager__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.tt-subject-manager__head strong {
  display: block;
  color: var(--tutor-ink);
  font: 650 1.08rem/1.3 var(--tutor-font-display);
}

.tt-subject-manager__head span {
  display: block;
  margin-top: 3px;
  color: var(--tutor-muted);
  font: 400 0.82rem/1.5 var(--tutor-font-body);
}

.tt-subject-manager__section {
  display: grid;
  gap: 8px;
}

.tt-subject-manager__section-title {
  color: var(--tutor-muted);
  font: 700 0.66rem/1.2 var(--tutor-font-data);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tt-subject-manager__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 280px;
  overflow-y: auto;
  padding: 2px;
}

.tt-subject-manager__row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--tutor-line);
  border-radius: var(--tutor-radius-card);
  background: var(--tutor-paper);
}

.tt-subject-manager__row.is-current {
  border-color: var(--tutor-brand-soft);
  background: var(--tutor-brand-whisper);
  box-shadow: inset 3px 0 0 var(--tutor-brand);
}

.tt-subject-manager__select {
  flex: 1;
  min-width: 0;
  padding: 2px;
  border: 0;
  background: transparent;
  text-align: left;
}

.tt-subject-manager__select strong {
  display: block;
  color: var(--tutor-ink);
  font: 800 0.88rem/1.3 var(--tutor-font-body);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tt-subject-manager__select span {
  display: block;
  margin-top: 2px;
  color: var(--tutor-muted);
  font: 600 0.68rem/1.4 var(--tutor-font-data);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* ------------------------------------------------------------
   Loading / empty
   ------------------------------------------------------------ */
.tt-loading {
  display: grid;
  place-items: center;
  gap: 14px;
  padding: 44px 24px;
  color: var(--tutor-muted);
  font: 600 0.82rem/1.5 var(--tutor-font-body);
  text-align: center;
}

.tt-loading::before {
  content: "";
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--tutor-line);
  border-top-color: var(--tutor-brand);
  animation: tutor-spin 0.8s linear infinite;
}

/* ------------------------------------------------------------
   Focus + motion
   ------------------------------------------------------------ */
.ai-tutor-launcher:focus-visible,
.ai-tutor-close:focus-visible,
.ai-tutor-send:focus-visible,
.ai-selection-popover:focus-visible,
.tt-btn:focus-visible,
.tt-chip:focus-visible,
.tt-mode:focus-visible,
.tt-style:focus-visible,
.tt-onboard__subject:focus-visible,
.tt-practice__option:focus-visible,
.tt-review__item:focus-visible,
.tt-plan__topic:focus-visible {
  outline: 3px solid rgba(102, 48, 201, 0.3);
  outline-offset: 2px;
}

@keyframes tutor-enter {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes tutor-pop {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes tutor-dots {
  0%,
  100% {
    opacity: 0.35;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(-1px);
  }
}

@keyframes tutor-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (hover: hover) and (pointer: fine) {
  .ai-tutor-launcher:hover,
  .tt-btn:hover,
  .tt-chip:hover,
  .tt-style:hover,
  .tt-onboard__subject:hover,
  .tt-practice__option:hover:not(:disabled),
  .tt-review__item:hover,
  .ai-tutor-prompts button:hover {
    transform: translateY(-1px);
  }
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 42rem) {
  .ai-tutor-panel {
    inset: 10px;
    width: auto;
    height: auto;
    border-radius: 32px;
  }

  .ai-tutor-launcher {
    right: 16px;
    bottom: 16px;
    top: auto;
    width: 56px;
    min-height: 56px;
    justify-content: center;
    padding: 8px;
    gap: 0;
  }

  .ai-tutor-launcher > span:not(.ai-tutor-launcher__mark) {
    display: none;
  }

  .ai-tutor-head {
    padding: 16px 18px 12px;
  }

  .ai-tutor-context {
    padding-inline: 18px;
  }

  .tt-subjectbar {
    padding-inline: 18px;
  }

  .tt-modebar {
    margin-inline: 18px;
    overflow-x: auto;
  }

  .tt-mode {
    flex: 1 0 auto;
    padding-inline: 14px;
  }

  .ai-tutor-messages {
    padding: 18px;
  }

  .ai-tutor-prompts-wrap {
    padding: 12px 18px 0;
  }

  .ai-tutor-input-row {
    margin-inline: 18px;
    margin-bottom: 16px;
  }

  .ai-tutor-input-row {
    grid-template-columns: 1fr;
  }

  .ai-tutor-send {
    width: 100%;
  }

  .tt-onboard,
  .tt-practice,
  .tt-review,
  .tt-plan,
  .tt-lesson {
    padding-inline: 18px;
  }

  .tt-style-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .tt-onboard__nav,
  .tt-lesson__actions,
  .tt-practice__next {
    flex-wrap: wrap;
  }

  .tt-onboard__nav .tt-btn,
  .tt-lesson__actions .tt-btn,
  .tt-practice__next .tt-btn {
    flex: 1 1 auto;
  }

  .tt-onboard__footer {
    padding-inline: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-tutor-panel,
  .ai-tutor-launcher,
  .ai-selection-popover,
  .tt-btn,
  .tt-chip,
  .tt-mode,
  .tt-style,
  .tt-onboard__subject,
  .tt-practice__option,
  .tt-review__item,
  .tt-lesson__bar-fill {
    animation: none;
    transition-duration: 0.01ms;
  }
}