.learning-page {
  width: min(760px, calc(100% - 40px));
}

.learning-page .site-mark {
  right: max(20px, calc((100% - 760px) / 2));
}

.article-header h1 {
  max-width: calc(100% - 6.5rem);
}

.article-header > p:not(.private-label) {
  max-width: 100%;
}

.article-section {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  border-bottom: 1px solid var(--line);
}

.section-label {
  margin: 0 0 0.65rem;
  color: var(--accent);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-section > h2 {
  max-width: 100%;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.04;
}

.section-intro {
  max-width: 100%;
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.02rem;
  line-height: 1.72;
}

.intro-copy {
  max-width: 100%;
  margin-top: 1.75rem;
}

.intro-copy p {
  margin: 0;
  color: var(--ink);
  font-size: 1.05rem;
  line-height: 1.78;
}

.intro-copy p + p {
  margin-top: 1.35rem;
}

.rules-list {
  margin: clamp(2.2rem, 5vw, 3.5rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.rules-list li {
  display: grid;
  grid-template-columns: 48px minmax(180px, 0.62fr) minmax(0, 1.25fr);
  gap: clamp(1rem, 3vw, 2rem);
  align-items: start;
  padding: 1.45rem 0;
  border-bottom: 1px solid var(--line);
}

.rule-number {
  padding-top: 0.16rem;
  color: var(--warm);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.rules-list h3,
.rules-list p {
  margin: 0;
}

.rules-list h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1.28;
}

.rules-list p {
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.91rem;
  line-height: 1.65;
}

.build-piece {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 0;
}

.build-piece + .build-piece {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
  border-top: 1px solid var(--line);
}

.build-piece > h3 {
  max-width: 100%;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.65rem, 4vw, 2.35rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.08;
}

.build-piece > p {
  max-width: 100%;
  margin: 1.15rem 0 0;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.96rem;
  line-height: 1.72;
}

.tool-note,
.plain-note {
  max-width: 100%;
  margin-top: 1.6rem;
  padding: 1.1rem 1.25rem;
  border-left: 3px solid var(--accent);
  background: rgba(47, 111, 94, 0.065);
}

.tool-note p,
.plain-note p {
  margin: 0;
}

.tool-note p:last-child,
.plain-note p {
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92rem;
  line-height: 1.6;
}

.source-note {
  font-size: 0.84rem !important;
}

.copy-button {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 42px;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: 5px;
  color: #fff;
  background: var(--accent);
  font: 700 0.8rem/1 Arial, Helvetica, sans-serif;
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.copy-button:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.copy-button:active {
  transform: translateY(1px);
}

.copy-button:focus-visible {
  outline: 3px solid rgba(47, 111, 94, 0.25);
  outline-offset: 3px;
}

.copy-button.is-copied {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.copy-icon {
  position: relative;
  width: 0.78rem;
  height: 0.78rem;
  border: 1.5px solid currentColor;
  border-radius: 2px;
}

.copy-icon::before {
  content: "";
  position: absolute;
  top: -4px;
  left: -4px;
  width: 0.64rem;
  height: 0.64rem;
  border-top: 1.5px solid currentColor;
  border-left: 1.5px solid currentColor;
  border-radius: 2px 0 0;
}

.copy-status {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.brain-folder {
  position: relative;
  margin-top: 2.6rem;
  padding: clamp(1.4rem, 4vw, 2.25rem);
  border: 1px solid #c8bca9;
  border-radius: 0 7px 7px 7px;
  background: #fffdf8;
  box-shadow: 9px 11px 0 rgba(168, 81, 46, 0.08);
}

.brain-folder::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: -1px;
  width: 38%;
  height: 1.05rem;
  border: 1px solid #c8bca9;
  border-bottom: 0;
  border-radius: 7px 7px 0 0;
  background: #fffdf8;
}

.folder-name {
  margin: 0 0 1rem;
  color: var(--warm);
  font-family: "Courier New", Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 700;
}

.brain-folder ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.brain-folder li {
  display: grid;
  grid-template-columns: minmax(170px, 0.8fr) minmax(0, 1fr);
  gap: 1.25rem;
  padding: 0.62rem 0;
  border-top: 1px solid #e5ded2;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.88rem;
}

.brain-folder strong {
  font-family: "Courier New", Consolas, monospace;
  font-size: 0.82rem;
}

.brain-folder span {
  color: var(--muted);
}

.file-guide {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.8rem;
}

.file-guide p {
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.86rem;
  line-height: 1.65;
}

.session-loop {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.8rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.session-loop article {
  padding: 1.25rem;
  background: rgba(255, 255, 255, 0.7);
}

.session-loop h4,
.session-loop p {
  margin: 0;
}

.session-loop h4 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 400;
}

.session-loop p:last-child {
  margin-top: 0.65rem;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.85rem;
  line-height: 1.6;
}

.handoff-section {
  border-bottom: 0;
}

.handoff-section > p:not(.section-label) {
  max-width: 100%;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.96rem;
  line-height: 1.7;
}

.final-request {
  max-width: 100%;
  margin: 1.6rem 0;
  padding: 1.35rem 1.5rem;
  border-left: 3px solid var(--warm);
  color: var(--ink);
  background: rgba(168, 81, 46, 0.055);
  font-size: 1.03rem;
  line-height: 1.65;
}

.handoff-actions {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
}

.copy-article {
  min-width: 150px;
}

@media (max-width: 760px) {
  .learning-page {
    width: min(100% - 32px, 760px);
  }

  .rules-list li {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 0.65rem 0.8rem;
  }

  .rules-list h3 {
    grid-column: 2;
  }

  .rules-list p {
    grid-column: 2;
  }

  .copy-button {
    width: 100%;
  }

  .brain-folder li,
  .file-guide,
  .session-loop {
    grid-template-columns: 1fr;
  }

  .brain-folder li {
    gap: 0.15rem;
  }

  .file-guide {
    gap: 1.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .copy-button {
    transition: none;
  }
}