/* Shared navigation for all lesson pages. */
body {
  padding-bottom: 86px;
}

.skip-link {
  position: fixed;
  z-index: 110;
  top: 10px;
  left: 50%;
  padding: 10px 16px;
  border-radius: 12px;
  color: #fff;
  background: var(--green);
  box-shadow: 0 10px 28px rgba(24, 49, 47, 0.2);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
  transform: translate(-50%, -160%);
  transition: transform 0.18s ease;
}

.skip-link:focus {
  transform: translate(-50%, 0);
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.table-wrap:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

/* Wrapped emphasis gets a fresh underline on each line instead of a sliced artifact. */
.opening strong {
  padding: 0 0.04em;
  background-image: linear-gradient(
    to bottom,
    transparent 0 68%,
    rgba(213, 108, 69, 0.22) 68% 88%,
    transparent 88% 100%
  );
  background-repeat: no-repeat;
  text-decoration: none;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.inline-term {
  white-space: nowrap;
}

/* Keep the reading hierarchy clear across long lesson pages. */
.opening .section-intro > .plain-paragraph {
  font-size: clamp(28px, 2.4vw, 30px);
  font-weight: 600;
  line-height: 1.62;
}

.lesson-content .section-head h2 {
  font-size: clamp(34px, 2.8vw, 38px);
  line-height: 1.32;
}

.lesson-content .section-card h3 {
  font-size: 21px;
  line-height: 1.5;
}

.lesson-content .lesson-quote {
  font-size: 18px;
  font-weight: 600;
}

/* Keep quote accents inside the rounded card instead of using a square edge border. */
.highlight,
.lesson-quote {
  position: relative;
  border-left: 0;
  border-radius: var(--radius-sm);
}

.highlight {
  padding-left: 36px;
}

.lesson-quote {
  padding-left: 34px;
}

.highlight::before,
.lesson-quote::before {
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 14px;
  width: 5px;
  border-radius: 999px;
  background: var(--orange);
  content: "";
}

/* Emotion-regulation stages use the same numbered, soft-card language as the course. */
.development-path {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  width: 100%;
  margin: 28px auto 0;
  counter-reset: emotion-stage;
}

.development-path div {
  position: relative;
  display: grid;
  place-items: center;
  gap: 10px;
  min-height: 112px;
  padding: 16px 10px;
  border: 1px solid rgba(45, 105, 98, 0.16);
  border-radius: var(--radius-sm);
  color: var(--green);
  background: var(--mint);
  box-shadow: 0 8px 22px rgba(37, 54, 49, 0.05);
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 750;
  line-height: 1.45;
  text-align: center;
  counter-increment: emotion-stage;
}

.development-path div::before {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: #fff;
  background: var(--green-2);
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 850;
  content: counter(emotion-stage, decimal-leading-zero);
}

.development-path div:first-child,
.development-path div:last-child {
  border-color: rgba(240, 194, 103, 0.58);
  background: linear-gradient(145deg, var(--mint), rgba(240, 194, 103, 0.2));
}

.development-path div:not(:last-child)::after {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: -21px;
  bottom: auto;
  left: auto;
  width: 28px;
  color: var(--orange);
  content: "→";
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  transform: translateY(-50%);
}

/* A compact visual formula for the five parts of a well-balanced play day. */
.daily-play-formula {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  margin: 26px 0 30px;
  padding: 0;
  list-style: none;
}

.daily-play-formula li {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 104px;
  margin: 0;
  padding: 15px 10px;
  border: 1px solid rgba(45, 105, 98, 0.16);
  border-radius: var(--radius-sm);
  color: var(--green);
  background: var(--mint);
  box-shadow: 0 8px 22px rgba(37, 54, 49, 0.05);
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 750;
  line-height: 1.45;
  text-align: center;
}

.daily-play-formula li:first-child,
.daily-play-formula li:last-child {
  border-color: rgba(240, 194, 103, 0.58);
  background: linear-gradient(145deg, var(--mint), rgba(240, 194, 103, 0.2));
}

.daily-play-formula li:not(:last-child)::after {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: -20px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: var(--orange);
  background: #fffdf9;
  box-shadow: 0 0 0 4px #fffdf9;
  content: "+";
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 850;
  line-height: 1;
  transform: translateY(-50%);
}

/* Reusable vertical process for lesson explanations. */
.thinking-flow {
  display: grid;
  gap: 34px;
  width: min(560px, 100%);
  margin: 26px auto 32px;
  padding: 0;
  list-style: none;
  counter-reset: thinking-step;
}

.thinking-flow li {
  position: relative;
  display: grid;
  grid-template-columns: 38px 1fr;
  align-items: center;
  gap: 13px;
  min-height: 72px;
  padding: 15px 20px;
  border: 1px solid rgba(45, 105, 98, 0.14);
  border-radius: var(--radius-sm);
  color: var(--green);
  background: var(--mint);
  box-shadow: 0 8px 24px rgba(37, 54, 49, 0.05);
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  counter-increment: thinking-step;
}

.thinking-flow li::before {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: #fff;
  background: var(--green-2);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.04em;
  content: counter(thinking-step, decimal-leading-zero);
}

.thinking-flow li:not(:last-child)::after {
  position: absolute;
  bottom: -29px;
  left: 50%;
  color: var(--orange);
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
  content: "↓";
  transform: translateX(-50%);
}

.thinking-flow li:first-child,
.thinking-flow li:last-child {
  border-color: rgba(240, 194, 103, 0.55);
  background: linear-gradient(135deg, var(--mint), rgba(240, 194, 103, 0.2));
}

.thinking-flow--detailed li {
  align-items: start;
}

.thinking-flow--detailed li > div {
  display: grid;
  gap: 5px;
}

.thinking-flow--detailed li strong {
  font-size: 18px;
  line-height: 1.45;
}

.thinking-flow--detailed li span {
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.65;
}

/* Compact cause-and-result lists used in lesson examples. */
.compact-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0 28px;
  padding: 0;
  list-style: none;
}

.compact-cards--single {
  grid-template-columns: 1fr;
}

.compact-cards li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 58px;
  padding: 14px 17px;
  border: 1px solid rgba(45, 105, 98, 0.14);
  border-radius: var(--radius-sm);
  background: var(--mint);
  box-shadow: 0 7px 20px rgba(37, 54, 49, 0.04);
}

.compact-cards strong {
  color: var(--green);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.5;
}

.compact-cards span {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
}

.compact-cards span::before {
  margin-right: 8px;
  color: var(--orange);
  font-weight: 850;
  content: "→";
}

.compact-cards--warning li {
  border-color: rgba(213, 108, 69, 0.2);
  background: var(--orange-soft);
}

.compact-cards--warning strong {
  color: var(--orange);
}

/* Numbered recap cards avoid long alternating heading/paragraph stacks. */
.framework-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px;
  margin: 24px 0 30px;
  padding: 0;
  list-style: none;
  counter-reset: framework-step;
}

.framework-grid li {
  display: grid;
  grid-template-columns: 38px 1fr;
  align-items: start;
  gap: 12px;
  min-height: 92px;
  padding: 16px 18px;
  border: 1px solid rgba(45, 105, 98, 0.14);
  border-radius: var(--radius-sm);
  background: #fffdf9;
  counter-increment: framework-step;
}

.framework-grid li::before {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 13px;
  color: #fff;
  background: var(--green-2);
  font-size: 11px;
  font-weight: 850;
  content: counter(framework-step, decimal-leading-zero);
}

.framework-grid li > div {
  display: grid;
  gap: 4px;
}

.framework-grid strong {
  color: var(--green);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.45;
}

.framework-grid span {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
}

/* Three-zone task difficulty spectrum. */
.challenge-spectrum {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0 30px;
}

.challenge-zone {
  min-height: 126px;
  padding: 20px 16px;
  display: grid;
  place-content: center;
  gap: 8px;
  border: 1px solid rgba(213, 108, 69, 0.18);
  border-radius: var(--radius-sm);
  background: var(--orange-soft);
  text-align: center;
}

.challenge-zone strong {
  color: var(--orange);
  font-family: var(--font-serif);
  font-size: 18px;
}

.challenge-zone span {
  color: var(--ink-soft);
  font-size: 14px;
}

.challenge-zone--best {
  border-color: rgba(45, 105, 98, 0.24);
  background: var(--mint);
  box-shadow: 0 9px 24px rgba(37, 54, 49, 0.06);
}

.challenge-zone--best strong {
  color: var(--green-2);
}

.course-nav {
  position: fixed;
  z-index: 100;
  left: 50%;
  bottom: max(14px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  border: 1px solid rgba(24, 49, 47, 0.12);
  border-radius: 18px;
  background: rgba(255, 253, 248, 0.92);
  box-shadow: 0 14px 38px rgba(24, 49, 47, 0.18);
  font-size: 13px;
  transform: translateX(-50%);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.course-nav a {
  color: inherit;
  text-decoration: none;
}

.course-nav-home,
.course-nav-step,
.course-nav-picker summary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 12px;
  transition: 0.18s ease;
}

.course-nav-home {
  gap: 6px;
  padding: 0 13px;
  color: var(--green);
  font-weight: 750;
}

.course-nav-home .home-mark {
  display: inline-block;
  width: 18px;
  height: 18px;
  color: var(--orange);
  background: currentColor;
  font-size: 0;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M10 20v-6h4v6h5v-8h3L12 3 2 12h3v8z'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M10 20v-6h4v6h5v-8h3L12 3 2 12h3v8z'/%3E%3C/svg%3E") center / contain no-repeat;
}

.course-nav-step {
  width: 42px;
  color: var(--green);
  font-size: 20px;
  font-weight: 700;
}

.course-nav-home:hover,
.course-nav-step:hover,
.course-nav-home:focus-visible,
.course-nav-step:focus-visible {
  background: var(--mint);
  outline: none;
}

.course-nav-step.is-disabled {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  min-height: 42px;
  border-radius: 12px;
  color: rgba(24, 49, 47, 0.25);
  font-size: 20px;
  cursor: not-allowed;
}

.course-nav-picker {
  position: relative;
}

.course-nav-picker summary {
  min-width: 76px;
  padding: 0 12px;
  color: #fff;
  background: var(--green);
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  list-style: none;
}

.course-nav-picker summary::-webkit-details-marker {
  display: none;
}

.course-nav-picker summary:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 2px;
}

.course-nav-picker summary::after {
  margin-left: 7px;
  color: var(--yellow);
  font-size: 9px;
  content: "▲";
}

.course-nav-picker[open] summary {
  background: var(--green-2);
}

.course-nav-picker[open] summary::after {
  content: "▼";
}

.course-nav-menu {
  position: absolute;
  box-sizing: border-box;
  bottom: calc(100% + 12px);
  left: 50%;
  width: min(380px, calc(100vw - 24px));
  max-height: min(62vh, 520px);
  padding: 8px;
  overflow-y: auto;
  border: 1px solid rgba(24, 49, 47, 0.12);
  border-radius: 18px;
  background: rgba(255, 253, 248, 0.98);
  box-shadow: 0 20px 55px rgba(24, 49, 47, 0.2);
  transform: translateX(-50%);
}

.course-nav-menu a {
  display: grid;
  grid-template-columns: 38px 1fr;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--ink);
  text-align: left;
}

.course-nav-menu a:hover,
.course-nav-menu a:focus-visible {
  background: var(--mint-2);
  outline: none;
}

.course-nav-menu a[aria-current="page"] {
  color: var(--green);
  background: rgba(240, 194, 103, 0.28);
}

.course-nav-menu .menu-num {
  color: var(--orange);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.course-nav-menu strong {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.45;
}

@media (max-width: 720px) {
  .toc {
    display: none;
  }

  .opening .section-intro > .plain-paragraph {
    font-size: 22px;
    line-height: 1.65;
  }

  .lesson-content .section-head h2 {
    font-size: 28px;
  }

  .lesson-content .section-card h3 {
    font-size: 19px;
  }

  .lesson-content .lesson-quote {
    font-size: 17px;
  }

  .development-path {
    grid-template-columns: 1fr;
    gap: 28px;
    width: min(100%, 520px);
  }

  .development-path div {
    grid-template-columns: 36px 1fr;
    place-items: center start;
    gap: 12px;
    min-height: 66px;
    padding: 13px 16px;
    font-size: 17px;
    text-align: left;
  }

  .development-path div::before {
    width: 36px;
    height: 36px;
  }

  .development-path div:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -24px;
    left: 50%;
    width: auto;
    content: "↓";
    transform: translateX(-50%);
  }

  .daily-play-formula {
    grid-template-columns: 1fr;
    gap: 30px;
    width: min(100%, 520px);
    margin: 24px auto 30px;
  }

  .daily-play-formula li {
    place-items: center start;
    min-height: 66px;
    padding: 14px 20px;
    font-size: 17px;
    text-align: left;
  }

  .daily-play-formula li:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -27px;
    left: 50%;
    transform: translateX(-50%);
  }
}

@media (max-width: 520px) {
  .course-nav {
    width: calc(100% - 24px);
    justify-content: center;
  }

  .course-nav-home {
    min-width: 42px;
    padding: 0 10px;
  }

  .course-nav-home .home-text {
    display: none;
  }

  .course-nav-home .home-mark {
    width: 24px;
    height: 24px;
  }

  .course-nav-picker summary {
    min-width: 72px;
  }

  .course-nav-menu {
    position: fixed;
    right: 12px;
    bottom: calc(max(14px, env(safe-area-inset-bottom)) + 66px);
    left: 12px;
    width: auto;
    transform: none;
  }

  .thinking-flow {
    gap: 30px;
    margin: 22px auto 28px;
  }

  .thinking-flow li {
    grid-template-columns: 34px 1fr;
    gap: 11px;
    min-height: 64px;
    padding: 13px 15px;
    font-size: 17px;
  }

  .thinking-flow li::before {
    width: 34px;
    height: 34px;
  }

  .thinking-flow li:not(:last-child)::after {
    bottom: -26px;
    font-size: 20px;
  }

  .thinking-flow--detailed li strong {
    font-size: 16px;
  }

  .thinking-flow--detailed li span {
    font-size: 13px;
  }

  .compact-cards,
  .framework-grid,
  .challenge-spectrum {
    grid-template-columns: 1fr;
  }

  .compact-cards {
    gap: 9px;
  }

  .compact-cards li {
    min-height: 54px;
    padding: 12px 14px;
  }

  .framework-grid li {
    min-height: 82px;
    padding: 14px 15px;
  }

  .challenge-spectrum {
    gap: 9px;
  }

  .challenge-zone {
    min-height: 94px;
    padding: 16px;
  }
}

@media print {
  body {
    padding-bottom: 0;
  }

  .skip-link,
  .course-nav {
    display: none;
  }
}