/* Lesson companion modal. All selectors are scoped to the lesson-* namespace. */
.lesson-backdrop {
  position: fixed;
  inset: 0;
  z-index: 2400;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3vh 2vw;
  overflow-y: auto;
  background: rgba(3, 10, 13, .78);
  backdrop-filter: blur(5px);
}

.lesson-backdrop[hidden] {
  display: none !important;
}

.lesson-dialog {
  width: min(1180px, 96vw);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  color: var(--text);
  background: var(--surface);
  border: 3px solid var(--surface2);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-modal);
  font-family: inherit;
}

.lesson-dialog * {
  box-sizing: border-box;
}

.lesson-dialog button,
.lesson-dialog textarea {
  font: inherit;
}

.lesson-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 28px 18px;
  border-bottom: 2px solid var(--surface2);
  background: var(--bg2);
}

.lesson-header h2,
.lesson-panel h3,
.lesson-dialog p {
  margin-top: 0;
}

.lesson-header h2 {
  margin-bottom: 6px;
  color: var(--text);
  font-size: clamp(23px, 2.4vw, 31px);
  line-height: 1.12;
  letter-spacing: -.035em;
}

.lesson-intro {
  margin-bottom: 0;
  color: var(--text2);
  font-size: 14px;
}

.lesson-eyebrow {
  margin-bottom: 7px;
  color: var(--yellow);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .12em;
  line-height: 1.3;
  text-transform: uppercase;
}

.lesson-close {
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  color: #fff;
  background: var(--surface2);
  border: 2px solid var(--surface2);
  border-radius: var(--r-pill);
  cursor: pointer;
  font-size: 18px !important;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast, .15s);
}

.lesson-close:hover {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
  transform: scale(1.1);
}

.lesson-dialog button:focus-visible,
.lesson-dialog textarea:focus-visible,
.lesson-dialog:focus-visible {
  outline: 3px solid var(--cyan) !important;
  outline-offset: 2px !important;
}

.lesson-body {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(310px, .88fr) minmax(0, 1.12fr);
  align-items: start;
  gap: 16px;
  padding: 18px 22px 20px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.lesson-panel {
  min-width: 0;
  padding: 18px;
  background: var(--card);
  border: 2px solid var(--surface2);
  border-radius: var(--r-md);
}

.lesson-panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 15px;
}

.lesson-panel-heading h3 {
  margin-bottom: 0;
  color: #eef9f1;
  font-size: 17px;
  line-height: 1.25;
}

.lesson-total,
.lesson-cycle-count {
  flex: 0 0 auto;
  padding: 6px 9px;
  color: #a3edb9;
  background: rgba(83, 190, 117, .11);
  border: 1px solid rgba(125, 220, 153, .2);
  border-radius: var(--r-pill);
  font-size: 11px;
  font-weight: 800;
}

.lesson-clock {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  color: #f5fff7;
  background: linear-gradient(110deg, rgba(68, 164, 100, .17), rgba(20, 45, 33, .2));
  border: 1px solid rgba(138, 220, 159, .17);
  border-radius: var(--r-md);
}

.lesson-clock-label,
.lesson-clock-total {
  display: block;
  color: #a8c7b1;
  font-size: 11px;
}

.lesson-clock-value {
  display: inline-block;
  margin: 3px 7px 0 0;
  color: #f4fff7;
  font-size: 31px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.04em;
  line-height: 1;
}

.lesson-clock-total {
  display: inline-block;
}

.lesson-clock-icon {
  color: #8ce5a6;
  font-size: 35px;
  line-height: 1;
}

.lesson-progress-track {
  height: 6px;
  margin: 12px 1px;
  overflow: hidden;
  background: rgba(255, 255, 255, .08);
  border-radius: var(--r-pill);
}

.lesson-progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, #55bb77, #a5efb9);
  border-radius: inherit;
  transition: width .25s ease;
}

.lesson-timer-controls,
.lesson-challenge-actions,
.lesson-mission-action {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.lesson-button {
  min-height: 36px;
  padding: 8px 16px;
  color: var(--text);
  border: 2px solid var(--surface2);
  border-radius: var(--r-pill);
  cursor: pointer;
  font-size: 12px !important;
  font-weight: 800;
  line-height: 1.2;
  transition: all var(--transition-fast, .15s);
}

.lesson-button:hover {
  transform: translateY(-2px);
  border-color: var(--yellow);
}

.lesson-button:active,
.lesson-close:active,
.lesson-grade-switch button:active,
.lesson-scenario-card:active {
  transform: scale(0.96);
}

.lesson-button:disabled {
  cursor: not-allowed;
  opacity: .45;
  transform: none !important;
}

.lesson-button-primary {
  color: var(--on-green);
  background: var(--green);
  border-color: transparent;
  box-shadow: var(--shadow-glow-green);
}

.lesson-button-primary:hover {
  background: var(--green-dark);
  color: var(--on-green);
  border-color: transparent;
}

.lesson-button-quiet {
  color: var(--text2);
  background: var(--bg2);
  border-color: var(--surface2);
}

.lesson-button-outline {
  color: var(--text);
  background: transparent;
  border-color: var(--surface2);
}

.lesson-timer-status {
  min-height: 18px;
  margin: 9px 0 14px;
  color: #9fb6a7;
  font-size: 11px;
}

.lesson-timeline {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.lesson-phase {
  position: relative;
  display: grid;
  grid-template-columns: 43px minmax(0, 1fr);
  gap: 11px;
  padding: 10px 9px;
  border-left: 2px solid rgba(128, 157, 137, .2);
  transition: background .2s ease, border-color .2s ease;
}

.lesson-phase[aria-current="step"] {
  background: rgba(101, 190, 124, .085);
  border-left-color: #81dc9b;
}

.lesson-phase-time {
  align-self: start;
  padding-top: 1px;
  color: #9eeab2;
  font-size: 14px;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.lesson-phase-time small {
  margin-left: 2px;
  color: #8ca898;
  font-size: 9px;
  font-weight: 600;
}

.lesson-phase-copy strong,
.lesson-phase-copy span {
  display: block;
}

.lesson-phase-copy strong {
  margin-bottom: 3px;
  color: #e5f3e9;
  font-size: 12px;
}

.lesson-phase-copy span {
  color: #a9beb0;
  font-size: 11px;
  line-height: 1.38;
}

.lesson-planning-column {
  display: grid;
  gap: 14px;
}

.lesson-grade-switch {
  display: flex;
  width: fit-content;
  gap: 4px;
  margin: 0 0 13px;
  padding: 4px;
  background: var(--bg2);
  border: 2px solid var(--surface2);
  border-radius: var(--r-pill);
}

.lesson-grade-switch button {
  min-height: 32px;
  padding: 6px 14px;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  cursor: pointer;
  font-size: 11px;
  font-weight: 800;
  transition: all var(--transition-fast, .15s);
}

.lesson-grade-switch button:hover {
  color: var(--text);
  background: var(--surface);
}

.lesson-grade-switch button[aria-pressed="true"] {
  color: #fff;
  background: var(--surface2);
  border-color: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 210, 255, 0.25);
}

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

.lesson-scenario-card {
  min-width: 0;
  min-height: 76px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 10px 12px;
  text-align: left;
  color: var(--text2);
  background: var(--bg2);
  border: 2px solid var(--surface2);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all var(--transition-fast, .15s);
}

.lesson-scenario-card:hover {
  border-color: var(--yellow);
  color: #fff;
  transform: translateY(-2px);
}

.lesson-scenario-card.is-selected,
.lesson-scenario-card[aria-pressed="true"] {
  background: var(--surface2);
  border-color: var(--green);
  box-shadow: 0 0 12px rgba(0, 210, 106, 0.25);
}

.lesson-scenario-card strong {
  color: #edf8f0;
  font-size: 12px;
  line-height: 1.25;
}

.lesson-scenario-tag,
.lesson-scenario-mission {
  color: #9db4a4;
  font-size: 9px;
  line-height: 1.25;
}

.lesson-scenario-tag {
  color: #8adba1;
  font-weight: 750;
}

.lesson-scenario-detail {
  margin-top: 13px;
  padding-top: 13px;
  border-top: 1px solid rgba(202, 237, 213, .1);
}

.lesson-detail-kicker {
  margin-bottom: 4px;
  color: #8fdaa3;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.lesson-scenario-goal {
  margin-bottom: 8px;
  color: #d4e8d9;
  font-size: 12px;
  line-height: 1.4;
}

.lesson-steps {
  display: grid;
  gap: 4px;
  margin: 0 0 12px;
  padding-left: 19px;
  color: #b9cbbf;
  font-size: 11px;
  line-height: 1.4;
}

.lesson-steps li::marker {
  color: #8cdda1;
  font-weight: 800;
}

.lesson-mission-action span {
  color: #90a899;
  font-size: 10px;
}

.lesson-challenge-panel {
  border-color: rgba(138, 220, 159, .2);
  background: linear-gradient(145deg, rgba(46, 91, 59, .2), rgba(4, 13, 10, .42));
}

.lesson-challenge-panel .lesson-panel-heading {
  margin-bottom: 8px;
}

.lesson-challenge-goal {
  min-height: 31px;
  margin-bottom: 10px;
  color: #aac4b1;
  font-size: 11px;
  line-height: 1.4;
}

.lesson-edit-label {
  display: block;
  margin-bottom: 5px;
  color: #c4d8ca;
  font-size: 10px;
  font-weight: 750;
}

.lesson-challenge-edit {
  width: 100%;
  min-height: 58px;
  resize: vertical;
  padding: 10px 12px;
  color: var(--text);
  background: var(--bg2);
  border: 2px solid var(--surface2);
  border-radius: var(--r-md);
  font-size: 12px !important;
  line-height: 1.4;
}

.lesson-challenge-actions {
  justify-content: space-between;
  margin-top: 8px;
}

.lesson-small-note {
  margin: 7px 0 0;
  color: #92a99a;
  font-size: 10px;
}

.lesson-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  color: var(--text-muted);
  background: var(--bg2);
  border-top: 2px solid var(--surface2);
  font-size: 11px;
}

@media (max-width: 900px) {
  .lesson-dialog {
    width: min(740px, 96vw);
  }

  .lesson-body {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    padding: 14px;
  }

  .lesson-timeline-panel {
    order: 2;
  }
}

@media (max-width: 520px) {
  .lesson-backdrop {
    align-items: flex-start;
    padding: 2vh 2vw;
  }

  .lesson-dialog {
    width: 100%;
    max-height: 90vh;
    border-radius: var(--r-md);
  }

  .lesson-header {
    padding: 17px 16px 13px;
    gap: 12px;
  }

  .lesson-body {
    padding: 11px;
  }

  .lesson-panel {
    padding: 14px;
  }

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

  .lesson-scenario-card {
    min-height: 65px;
  }

  .lesson-footer {
    align-items: flex-start;
    padding: 10px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-dialog *,
  .lesson-dialog *::before,
  .lesson-dialog *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}