/* ============================================================
   TKMST – Twelve Key Number System Tools
   Frontend Stylesheet  |  v1.0.0
   All selectors namespaced under .tkmst-wrapper or .tkmst
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --tkmst-accent:      #5c6ac4;
  --tkmst-accent-dark: #4959b3;
  --tkmst-accent-lt:   #eef0fc;
  --tkmst-success:     #1e9e6b;
  --tkmst-success-lt:  #e6f7f1;
  --tkmst-danger:      #d94f4f;
  --tkmst-danger-lt:   #fdf0f0;
  --tkmst-warning:     #e6a817;
  --tkmst-warning-lt:  #fffbee;
  --tkmst-text:        #1a1a2e;
  --tkmst-text-muted:  #6b7280;
  --tkmst-border:      #e5e7eb;
  --tkmst-bg:          #f8f9ff;
  --tkmst-card-bg:     #ffffff;
  --tkmst-radius:      14px;
  --tkmst-radius-sm:   8px;
  --tkmst-shadow:      0 4px 24px rgba(92,106,196,0.10);
  --tkmst-shadow-hover:0 8px 32px rgba(92,106,196,0.18);
  --tkmst-font:        -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --tkmst-transition:  all .22s cubic-bezier(.4,0,.2,1);
}

/* ---------- Base Wrapper ---------- */
.tkmst-wrapper {
  font-family: var(--tkmst-font);
  color: var(--tkmst-text);
  line-height: 1.6;
  box-sizing: border-box;
  max-width: 860px;
  margin: 0 auto;
  padding: 0;
  /* accent override from inline style is already a CSS var */
  --tkmst-accent: var(--tkmst-accent, #5c6ac4);
}
.tkmst-wrapper *, .tkmst-wrapper *::before, .tkmst-wrapper *::after {
  box-sizing: border-box;
}

/* ---------- Loading Spinner ---------- */
.tkmst-loading {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 32px;
  color: var(--tkmst-text-muted);
  font-size: .95rem;
}
.tkmst-spinner {
  display: inline-block;
  width: 22px; height: 22px;
  border: 3px solid var(--tkmst-border);
  border-top-color: var(--tkmst-accent);
  border-radius: 50%;
  animation: tkmst-spin .7s linear infinite;
}
@keyframes tkmst-spin { to { transform: rotate(360deg); } }

/* ---------- Card ---------- */
.tkmst-card {
  background: var(--tkmst-card-bg);
  border-radius: var(--tkmst-radius);
  box-shadow: var(--tkmst-shadow);
  padding: 32px 36px;
  margin-bottom: 24px;
  border: 1.5px solid var(--tkmst-border);
  transition: var(--tkmst-transition);
}
.tkmst-card:hover { box-shadow: var(--tkmst-shadow-hover); }

.tkmst-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.tkmst-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--tkmst-text);
  margin: 0 0 4px;
}
.tkmst-card-subtitle {
  font-size: .88rem;
  color: var(--tkmst-text-muted);
  margin: 0;
}

/* ---------- Pill / Badge ---------- */
.tkmst-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .02em;
}
.tkmst-badge-accent   { background: var(--tkmst-accent-lt); color: var(--tkmst-accent); }
.tkmst-badge-success  { background: var(--tkmst-success-lt); color: var(--tkmst-success); }
.tkmst-badge-warning  { background: var(--tkmst-warning-lt); color: var(--tkmst-warning); }
.tkmst-badge-danger   { background: var(--tkmst-danger-lt);  color: var(--tkmst-danger); }
.tkmst-badge-gray     { background: #f3f4f6; color: var(--tkmst-text-muted); }

/* ---------- Buttons ---------- */
.tkmst-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 11px 24px;
  border-radius: var(--tkmst-radius-sm);
  border: none;
  cursor: pointer;
  font-family: var(--tkmst-font);
  font-size: .93rem;
  font-weight: 600;
  transition: var(--tkmst-transition);
  text-decoration: none;
  line-height: 1.2;
  white-space: nowrap;
  -webkit-user-select: none; user-select: none;
}
.tkmst-btn:focus-visible { outline: 3px solid var(--tkmst-accent); outline-offset: 2px; }
.tkmst-btn-primary {
  background: var(--tkmst-accent);
  color: #fff;
}
.tkmst-btn-primary:hover:not(:disabled) { background: var(--tkmst-accent-dark); transform: translateY(-1px); }
.tkmst-btn-secondary {
  background: var(--tkmst-accent-lt);
  color: var(--tkmst-accent);
}
.tkmst-btn-secondary:hover:not(:disabled) { background: #dde0f7; }
.tkmst-btn-success {
  background: var(--tkmst-success);
  color: #fff;
}
.tkmst-btn-danger {
  background: var(--tkmst-danger);
  color: #fff;
}
.tkmst-btn-ghost {
  background: transparent;
  color: var(--tkmst-accent);
  border: 1.5px solid var(--tkmst-accent);
}
.tkmst-btn-ghost:hover:not(:disabled) { background: var(--tkmst-accent-lt); }
.tkmst-btn-sm { padding: 7px 16px; font-size: .83rem; }
.tkmst-btn-lg { padding: 14px 32px; font-size: 1.05rem; }
.tkmst-btn:disabled { opacity: .45; cursor: not-allowed; transform: none !important; }

/* ---------- Note Buttons ---------- */
.tkmst-note-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}
.tkmst-note-btn {
  padding: 8px 16px;
  border-radius: var(--tkmst-radius-sm);
  border: 1.5px solid var(--tkmst-border);
  background: #fff;
  color: var(--tkmst-text);
  font-size: .92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--tkmst-transition);
  font-family: var(--tkmst-font);
}
.tkmst-note-btn:hover  { border-color: var(--tkmst-accent); color: var(--tkmst-accent); background: var(--tkmst-accent-lt); }
.tkmst-note-btn.active { background: var(--tkmst-accent); color: #fff; border-color: var(--tkmst-accent); }
.tkmst-note-btn.correct{ background: var(--tkmst-success); color: #fff; border-color: var(--tkmst-success); }
.tkmst-note-btn.wrong  { background: var(--tkmst-danger);  color: #fff; border-color: var(--tkmst-danger); }

/* ---------- Scale Slots ---------- */
.tkmst-scale-slots {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0;
}
.tkmst-slot {
  width: 58px;
  min-height: 58px;
  border-radius: var(--tkmst-radius-sm);
  border: 2px dashed var(--tkmst-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  transition: var(--tkmst-transition);
  position: relative;
  background: #fafbff;
}
.tkmst-slot .slot-label {
  font-size: .68rem;
  color: var(--tkmst-text-muted);
  font-weight: 500;
  margin-top: 2px;
}
.tkmst-slot.filled    { border-style: solid; border-color: var(--tkmst-accent); background: var(--tkmst-accent-lt); }
.tkmst-slot.correct   { border-color: var(--tkmst-success); background: var(--tkmst-success-lt); color: var(--tkmst-success); }
.tkmst-slot.wrong     { border-color: var(--tkmst-danger);  background: var(--tkmst-danger-lt);  color: var(--tkmst-danger); }

/* ---------- Formula Bar ---------- */
.tkmst-formula-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 14px 18px;
  background: var(--tkmst-accent-lt);
  border-radius: var(--tkmst-radius-sm);
  margin: 16px 0;
}
.tkmst-formula-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 38px;
}
.tkmst-formula-step .step-label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--tkmst-accent);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.tkmst-formula-step .step-arrow {
  font-size: .65rem;
  color: var(--tkmst-text-muted);
}
.tkmst-formula-step.active .step-label { color: var(--tkmst-accent-dark); background: white; padding: 2px 6px; border-radius: 4px; }

/* ---------- Progress Bar ---------- */
.tkmst-progress-wrap {
  margin: 18px 0;
}
.tkmst-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: .82rem;
  color: var(--tkmst-text-muted);
  margin-bottom: 6px;
}
.tkmst-progress-track {
  width: 100%;
  height: 10px;
  background: var(--tkmst-border);
  border-radius: 999px;
  overflow: hidden;
}
.tkmst-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--tkmst-accent), var(--tkmst-accent-dark));
  border-radius: 999px;
  transition: width .4s ease;
}
.tkmst-progress-fill.success { background: linear-gradient(90deg, var(--tkmst-success), #16c47a); }

/* ---------- Feedback Messages ---------- */
.tkmst-feedback {
  padding: 14px 18px;
  border-radius: var(--tkmst-radius-sm);
  font-size: .92rem;
  font-weight: 500;
  margin: 14px 0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.5;
}
.tkmst-feedback-icon { font-size: 1.2rem; flex-shrink: 0; }
.tkmst-feedback.correct { background: var(--tkmst-success-lt); color: var(--tkmst-success); border-left: 4px solid var(--tkmst-success); }
.tkmst-feedback.wrong   { background: var(--tkmst-danger-lt);  color: var(--tkmst-danger);  border-left: 4px solid var(--tkmst-danger); }
.tkmst-feedback.info    { background: var(--tkmst-accent-lt);  color: var(--tkmst-accent);  border-left: 4px solid var(--tkmst-accent); }
.tkmst-feedback.warning { background: var(--tkmst-warning-lt); color: var(--tkmst-warning); border-left: 4px solid var(--tkmst-warning); }

/* ---------- Score Display ---------- */
.tkmst-score-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 18px 0;
}
.tkmst-score-chip {
  flex: 1;
  min-width: 100px;
  padding: 16px;
  background: var(--tkmst-bg);
  border-radius: var(--tkmst-radius-sm);
  border: 1.5px solid var(--tkmst-border);
  text-align: center;
}
.tkmst-score-chip .chip-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--tkmst-accent);
  line-height: 1.1;
}
.tkmst-score-chip .chip-label {
  font-size: .76rem;
  color: var(--tkmst-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-top: 4px;
}

/* ---------- Form Elements ---------- */
.tkmst-select, .tkmst-input {
  padding: 10px 14px;
  border: 1.5px solid var(--tkmst-border);
  border-radius: var(--tkmst-radius-sm);
  font-family: var(--tkmst-font);
  font-size: .93rem;
  color: var(--tkmst-text);
  background: #fff;
  transition: var(--tkmst-transition);
  outline: none;
  width: 100%;
}
.tkmst-select:focus, .tkmst-input:focus {
  border-color: var(--tkmst-accent);
  box-shadow: 0 0 0 3px rgba(92,106,196,.12);
}
.tkmst-select { cursor: pointer; }

.tkmst-field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.tkmst-field-label {
  font-size: .84rem;
  font-weight: 600;
  color: var(--tkmst-text);
}

/* ---------- Mode Toggle ---------- */
.tkmst-mode-toggle {
  display: flex;
  background: var(--tkmst-bg);
  border: 1.5px solid var(--tkmst-border);
  border-radius: var(--tkmst-radius-sm);
  padding: 3px;
  gap: 2px;
  width: fit-content;
  margin-bottom: 20px;
}
.tkmst-mode-btn {
  padding: 7px 18px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--tkmst-text-muted);
  cursor: pointer;
  transition: var(--tkmst-transition);
  font-family: var(--tkmst-font);
}
.tkmst-mode-btn.active { background: var(--tkmst-accent); color: #fff; }

/* ---------- Piano Keyboard ---------- */
.tkmst-keyboard-wrap { margin: 16px 0; overflow-x: auto; }
.tkmst-keyboard {
  display: flex;
  position: relative;
  height: 120px;
  width: fit-content;
  min-width: 100%;
  gap: 0;
}
.tkmst-key {
  position: relative;
  flex: 0 0 44px;
  height: 120px;
  background: #fff;
  border: 1.5px solid #d1d5db;
  border-radius: 0 0 6px 6px;
  cursor: pointer;
  transition: var(--tkmst-transition);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 8px;
  font-size: .72rem;
  font-weight: 700;
  color: #374151;
  z-index: 1;
  user-select: none;
}
.tkmst-key:hover           { background: var(--tkmst-accent-lt); }
.tkmst-key.active          { background: var(--tkmst-accent); color: #fff; border-color: var(--tkmst-accent); }
.tkmst-key.correct-key     { background: var(--tkmst-success); color: #fff; border-color: var(--tkmst-success); }
.tkmst-key.wrong-key       { background: var(--tkmst-danger);  color: #fff; border-color: var(--tkmst-danger); }
.tkmst-key.black {
  position: absolute;
  flex: none;
  width: 28px;
  height: 72px;
  background: #1f2937;
  border-color: #111;
  border-radius: 0 0 4px 4px;
  z-index: 2;
  color: #e5e7eb;
  font-size: .6rem;
  padding-bottom: 4px;
}
.tkmst-key.black:hover           { background: var(--tkmst-accent-dark); }
.tkmst-key.black.active          { background: var(--tkmst-accent); }
.tkmst-key.black.correct-key     { background: var(--tkmst-success); }
.tkmst-key.black.wrong-key       { background: var(--tkmst-danger);  }

/* ---------- Grid / Mastery Grid ---------- */
.tkmst-keys-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.tkmst-key-card {
  background: var(--tkmst-card-bg);
  border: 2px solid var(--tkmst-border);
  border-radius: var(--tkmst-radius);
  padding: 20px 16px;
  text-align: center;
  cursor: pointer;
  transition: var(--tkmst-transition);
  position: relative;
}
.tkmst-key-card:hover         { border-color: var(--tkmst-accent); box-shadow: var(--tkmst-shadow); transform: translateY(-2px); }
.tkmst-key-card.mastered      { border-color: var(--tkmst-success); background: var(--tkmst-success-lt); }
.tkmst-key-card.in-progress   { border-color: var(--tkmst-warning); background: var(--tkmst-warning-lt); }
.tkmst-key-card .key-name     { font-size: 1.5rem; font-weight: 800; color: var(--tkmst-text); }
.tkmst-key-card .key-status   { font-size: .78rem; color: var(--tkmst-text-muted); margin-top: 4px; }
.tkmst-key-card .key-badge    { font-size: 1.4rem; margin-top: 6px; }
.tkmst-key-card.mastered .key-name   { color: var(--tkmst-success); }
.tkmst-key-card.mastered .key-status { color: var(--tkmst-success); }

/* ---------- Table ---------- */
.tkmst-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  margin: 16px 0;
}
.tkmst-table th {
  background: var(--tkmst-accent);
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-weight: 700;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.tkmst-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--tkmst-border);
}
.tkmst-table tr:last-child td { border-bottom: none; }
.tkmst-table tr:nth-child(even) td { background: var(--tkmst-bg); }
.tkmst-table .chord-quality-major { color: var(--tkmst-accent); font-weight: 700; }
.tkmst-table .chord-quality-minor { color: var(--tkmst-text-muted); }
.tkmst-table .chord-quality-dim   { color: var(--tkmst-warning); }

/* ---------- Certificate ---------- */
.tkmst-certificate {
  text-align: center;
  padding: 48px 32px;
  background: linear-gradient(135deg, #f8f9ff 0%, var(--tkmst-accent-lt) 100%);
  border-radius: var(--tkmst-radius);
  border: 3px solid var(--tkmst-accent);
  margin: 24px 0;
}
.tkmst-certificate .cert-icon  { font-size: 4rem; margin-bottom: 12px; }
.tkmst-certificate .cert-title { font-size: 1.6rem; font-weight: 800; color: var(--tkmst-accent); margin-bottom: 8px; }
.tkmst-certificate .cert-name  { font-size: 1.15rem; color: var(--tkmst-text); margin-bottom: 4px; }
.tkmst-certificate .cert-sub   { font-size: .9rem;  color: var(--tkmst-text-muted); }
.tkmst-certificate .cert-score { font-size: 2.4rem; font-weight: 900; color: var(--tkmst-success); margin: 16px 0 8px; }

/* ---------- Timer ---------- */
.tkmst-timer {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--tkmst-accent);
  padding: 6px 16px;
  background: var(--tkmst-accent-lt);
  border-radius: 999px;
}
.tkmst-timer.urgent { color: var(--tkmst-danger); background: var(--tkmst-danger-lt); }

/* ---------- Exam Sections ---------- */
.tkmst-exam-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.tkmst-exam-nav-dot {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 2px solid var(--tkmst-border);
  background: #fff;
  font-size: .8rem;
  font-weight: 700;
  color: var(--tkmst-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  transition: var(--tkmst-transition);
}
.tkmst-exam-nav-dot.active    { border-color: var(--tkmst-accent); color: var(--tkmst-accent); background: var(--tkmst-accent-lt); }
.tkmst-exam-nav-dot.done      { border-color: var(--tkmst-success); background: var(--tkmst-success); color: #fff; }

/* ---------- Divider ---------- */
.tkmst-divider { border: none; border-top: 1.5px solid var(--tkmst-border); margin: 24px 0; }

/* ---------- Utility Classes ---------- */
.tkmst-text-center { text-align: center; }
.tkmst-text-muted  { color: var(--tkmst-text-muted); font-size: .88rem; }
.tkmst-mt-16 { margin-top: 16px; }
.tkmst-mb-16 { margin-bottom: 16px; }
.tkmst-flex  { display: flex; }
.tkmst-gap-8 { gap: 8px; }
.tkmst-gap-12{ gap: 12px; }
.tkmst-flex-wrap { flex-wrap: wrap; }
.tkmst-align-center { align-items: center; }
.tkmst-justify-between { justify-content: space-between; }
.tkmst-hidden { display: none !important; }

/* ---------- Shortcode Title / Desc ---------- */
.tkmst-shortcode-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--tkmst-text);
  margin: 0 0 8px;
}
.tkmst-shortcode-desc {
  color: var(--tkmst-text-muted);
  font-size: .93rem;
  margin: 0 0 20px;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .tkmst-card { padding: 20px 18px; }
  .tkmst-scale-slots { gap: 6px; }
  .tkmst-slot { width: 44px; min-height: 44px; font-size: .88rem; }
  .tkmst-keys-grid { grid-template-columns: repeat(3, 1fr); }
  .tkmst-score-row  { gap: 10px; }
  .tkmst-score-chip .chip-value { font-size: 1.4rem; }
  .tkmst-btn-lg { padding: 11px 20px; font-size: .95rem; }
}
@media (max-width: 400px) {
  .tkmst-keys-grid { grid-template-columns: repeat(2, 1fr); }
  .tkmst-key { flex: 0 0 34px; }
}

/* ---------- Admin Styles ---------- */
.tkmst-admin-wrap h1 { margin-bottom: 8px; }
.tkmst-admin-wrap .description { color: #646970; margin-bottom: 20px; }