:root {
  --cl-primary:          #14828d;
  --cl-primary-light:    #3db4bf;
  --cl-primary-gradient: linear-gradient(180deg, #3db4bf 0%, #14828d 100%);
  --cl-dark:             #121717;
  --cl-text:             #2d3436;
  --cl-text-secondary:   #636e72;
  --cl-bg:               #faffff;
  --cl-bg-alt:           #f0f4f6;
  --cl-white:            #ffffff;
  --cl-border:           #e0e8ea;
  --cl-correct:          #2e7d32;
  --cl-mistake:          #d32f2f;
  --cl-lifehack:         #f57c00;
  --cl-theory-bg:        #e8f4f5;
  --cl-theory-border:    #b8dce0;
  --cl-theory-text:      #0d5e66;
  --cl-tldr-bg:          #fffbeb;
  --cl-tldr-border:      #fcd34d;
  --cl-tldr-text:        #92400e;
  --cl-capsule:          #e8f5e9;
  --cl-capsule-border:   #2e7d32;

  --font-main:      'Montserrat', sans-serif;
  --radius:         clamp(12px, 1.5vw, 16px);
  --radius-pill:    3.2rem;
  --shadow:         0 4px 24px rgba(0,0,0,.06);
  --transition:     200ms cubic-bezier(0.16, 1, 0.3, 1);

  --accent:         var(--cl-primary);
  --accent-bg:      rgba(20,130,141,.10);
  --accent-text:    var(--cl-primary);
}

.nmt-subtopic.subject-math,
.nmt-topic.subject-math,
.nmt-subtopic.subject-matematyka,
.nmt-topic.subject-matematyka     { --accent: #2563eb; --accent-bg: #dbeafe; --accent-text: #1d4ed8; }

.nmt-subtopic.subject-ukr,
.nmt-topic.subject-ukr,
.nmt-subtopic.subject-ukrainska-mova,
.nmt-topic.subject-ukrainska-mova { --accent: #d97706; --accent-bg: #fef3c7; --accent-text: #92400e; }

.nmt-subtopic.subject-eng,
.nmt-topic.subject-eng,
.nmt-subtopic.subject-anglijska,
.nmt-topic.subject-anglijska,
.nmt-subtopic.subject-anglijska-mova,
.nmt-topic.subject-anglijska-mova  { --accent: #7c3aed; --accent-bg: #ede9fe; --accent-text: #6d28d9; }

.nmt-subtopic.subject-bio,
.nmt-topic.subject-bio,
.nmt-subtopic.subject-biologiya,
.nmt-topic.subject-biologiya       { --accent: #16a34a; --accent-bg: #dcfce7; --accent-text: #166534; }

.nmt-subtopic.subject-hist,
.nmt-topic.subject-hist,
.nmt-subtopic.subject-istoriya-ukrayiny,
.nmt-topic.subject-istoriya-ukrayiny { --accent: #d97706; --accent-bg: #fef3c7; --accent-text: #92400e; }

.nmt-subtopic.subject-phys,
.nmt-topic.subject-phys,
.nmt-subtopic.subject-fizyka,
.nmt-topic.subject-fizyka          { --accent: #0891b2; --accent-bg: #cffafe; --accent-text: #155e75; }

.nmt-subtopic.subject-chem,
.nmt-topic.subject-chem,
.nmt-subtopic.subject-himiya,
.nmt-topic.subject-himiya          { --accent: #db2777; --accent-bg: #fce7f3; --accent-text: #9d174d; }

.nmt-subtopic.subject-geo,
.nmt-topic.subject-geo,
.nmt-subtopic.subject-geografiya,
.nmt-topic.subject-geografiya      { --accent: #65a30d; --accent-bg: #ecfccb; --accent-text: #3f6212; }

.nmt-subtopic,
.nmt-topic {
  font-family: var(--font-main);
  color: var(--cl-text);
  background: var(--cl-bg);
  line-height: 1.8;
  font-size: clamp(16px, 1.8vw, 17px);
  -webkit-font-smoothing: antialiased;
}

.nmt-bc {
  padding: 18px 0 6px;
  font-size: 12px;
  color: var(--cl-text-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}
.nmt-bc span { display: inline-flex; align-items: center; }
.nmt-bc span + span::before { content: '/'; margin: 0 6px; opacity: .5; }
.nmt-bc a { color: var(--cl-primary); text-decoration: none; }
.nmt-bc a:hover { text-decoration: underline; }

.sub-hero,
.topic-hero {
  padding: 28px 0 32px;
}

.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-main);
}
.chip--subject   { background: var(--accent-bg); color: var(--accent-text); }
.chip--topic     { background: var(--cl-bg-alt); color: var(--cl-text-secondary); }
.chip--diff-easy { background: #dcfce7; color: #166534; }
.chip--diff-mid  { background: #fef3c7; color: #92400e; }
.chip--diff-hard { background: #fee2e2; color: #991b1b; }

.sub-hero__title,
.topic-hero__title,
.nmt-subtopic h1.h4 {
  font-size: clamp(22px, 5vw, 38px);
  font-weight: 800;
  color: var(--cl-dark);
  line-height: 1.22;
  letter-spacing: -.3px;
  margin: 0 0 20px;
  font-family: var(--font-main);
}

.sub-hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--cl-primary-gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  margin-top: 8px;
}
.sub-hero__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(20,130,141,.3);
}

.sub-body,
.topic-body {
  padding: 8px 0 64px;
}

.sub-body h2,
.topic-body h2 {
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 700;
  color: var(--cl-dark);
  margin: 40px 0 16px;
  letter-spacing: -.3px;
  font-family: var(--font-main);
}
.sub-body h3,
.topic-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--cl-dark);
  margin: 28px 0 10px;
  font-family: var(--font-main);
}
.sub-body p,
.topic-body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--cl-text);
  margin-bottom: 10px;
}
.sub-body strong,
.topic-body strong { color: var(--accent-text); }

.byline {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--cl-border);
  border-bottom: 1px solid var(--cl-border);
  margin-bottom: 28px;
}
.byline__photo {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--accent-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-text);
  font-weight: 700;
  overflow: hidden;
}
.byline__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 18%;
  border-radius: 50%;
  display: block;
}
.byline__info { flex: 1; }
.byline__name { font-size: 14px; font-weight: 700; color: var(--cl-dark); }
.byline__name a { color: var(--cl-primary); text-decoration: none; }
.byline__name a:hover { text-decoration: underline; }
.byline__role { font-size: 12px; color: var(--cl-text-secondary); line-height: 1.4; }
.byline__review { font-size: 11px; color: var(--cl-text-secondary); margin-top: 2px; }

.tldr {
  background: var(--cl-tldr-bg);
  border: 1px solid var(--cl-tldr-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 28px;
}
.tldr__lbl,
.tldr__label {
  display: inline-block;
  background: var(--cl-tldr-border);
  color: var(--cl-tldr-text);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: .05em;
  text-transform: uppercase;
  margin-bottom: 10px;
  font-family: var(--font-main);
}
.tldr p,
.tldr__body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--cl-dark);
  margin-bottom: 8px;
}
.tldr__body p + p { margin-top: 10px; }
.tldr strong,
.tldr__body strong { color: var(--cl-tldr-text); }

.hook,
.nmt-why-matters {
  background: var(--cl-bg-alt);
  padding: 18px 22px;
  border-radius: var(--radius);
  margin-bottom: 28px;
  font-size: 14px;
  line-height: 1.7;
  border-left: 3px solid var(--accent);
}

.formula-grid,
.formulas,
.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}
.fcard,
.formula-card,
.figure-card {
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: 12px;
  padding: 16px 18px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.figure-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.fcard__name,
.formula-card__name,
.figure-card__name {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-text);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 8px;
  font-family: var(--font-main);
}
.figure-card__name {
  font-size: 16px;
  text-transform: none;
  letter-spacing: 0;
  color: var(--cl-dark);
}
.fcard__formula,
.formula-card__formula,
.figure-card__formula {
  font-family: 'Cambria Math', 'Times New Roman', serif;
  font-size: 18px;
  font-weight: 600;
  color: var(--cl-dark);
  line-height: 1.5;
  margin-bottom: 6px;
}
.figure-card__formula {
  font-size: 14px;
  line-height: 1.8;
  color: var(--cl-text);
}
.figure-card__formula strong { color: var(--accent-text); font-weight: 600; }
.fcard__note,
.formula-card__note,
.figure-card__note {
  font-size: 12px;
  color: var(--cl-text-secondary);
  line-height: 1.5;
}
.figure-card__note { margin-top: 8px; font-style: italic; }

.method-steps,
.methodology {
  list-style: none;
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  padding: 8px 22px;
  box-shadow: var(--shadow);
  margin: 0 0 28px;
}
.method-step,
.methodology__step {
  padding: 16px 0;
  border-bottom: 1px solid var(--cl-border);
}
.method-step:last-child,
.methodology__step:last-child { border-bottom: none; }
.method-step__body { flex: 1; }
.method-step__title,
.methodology__step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--cl-dark);
  margin-bottom: 8px;
  font-family: var(--font-main);
  font-size: 14px;
}
.method-step__num,
.methodology__step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  font-family: var(--font-main);
}
.methodology__step-content,
.method-step p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--cl-text);
  margin: 0;
}

.example {
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.example__head,
.example__header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.example__head > span:first-child,
.example__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 10px;
  background: var(--accent);
  color: #fff;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 700;
  font-family: var(--font-main);
}
.example__head > span:last-child,
.example__source {
  font-size: 12px;
  color: var(--cl-text-secondary);
}
.example__source a { color: var(--cl-primary); text-decoration: none; }
.example__source a:hover { text-decoration: underline; }
.example__body > *:first-child,
.example__question {
  font-size: 14px;
  line-height: 1.7;
  color: var(--cl-dark);
  margin-bottom: 16px;
  padding: 14px 16px;
  background: var(--cl-bg);
  border-radius: 10px;
  border-left: 3px solid var(--accent);
}
.example__hint {
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--cl-bg);
  border-radius: 10px;
  font-size: 12px;
  color: var(--cl-text-secondary);
  font-style: italic;
}
.example__reveal,
.featured__reveal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.example__reveal:hover,
.featured__reveal:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.example__solution-wrap[hidden],
.featured__solution[hidden] { display: none; }
.example__solution { margin-top: 14px; }
.example__solution-step,
.featured__solution-step {
  padding: 10px 0;
  border-bottom: 1px dashed var(--cl-border);
  font-size: 14px;
  line-height: 1.7;
}
.example__solution-step:last-child,
.featured__solution-step:last-child { border-bottom: none; }
.example__solution-step strong { color: var(--cl-dark); }
.example__answer,
.featured__answer {
  margin-top: 12px;
  background: var(--cl-capsule);
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--cl-capsule-border);
}

.featured {
  background: var(--cl-white);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 26px;
  position: relative;
  margin-bottom: 20px;
}
.featured__badge {
  position: absolute;
  top: -12px;
  left: 24px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 20px;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.featured__source {
  font-size: 12px;
  color: var(--cl-text-secondary);
  margin-bottom: 10px;
  margin-top: 6px;
}
.featured__source a { color: var(--cl-primary); text-decoration: none; }
.featured__question {
  font-size: 14px;
  line-height: 1.7;
  color: var(--cl-dark);
  margin-bottom: 16px;
  padding: 14px 16px;
  background: var(--cl-bg);
  border-radius: 10px;
  border-left: 3px solid var(--accent);
}
.featured__visual {
  margin: 16px 0;
  padding: 16px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 10px;
  text-align: center;
}

.cheat-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
  font-size: 14px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.cheat-table th {
  background: var(--accent);
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-family: var(--font-main);
  font-weight: 700;
}
.cheat-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--cl-border);
  background: var(--cl-white);
}
.cheat-table tr:last-child td { border-bottom: none; }

.cheat-sheet {
  background: var(--accent-bg);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 28px;
}
.cheat-sheet__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-text);
  margin-bottom: 4px;
  font-family: var(--font-main);
}
.cheat-sheet__subtitle {
  font-size: 12px;
  color: var(--cl-text-secondary);
  margin-bottom: 14px;
}
.cheat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}
.cheat-card {
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: 10px;
  padding: 12px 14px;
}
.cheat-card__title {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-text);
  margin-bottom: 4px;
  font-family: var(--font-main);
}
.cheat-card__rule {
  font-size: 12px;
  color: var(--cl-text);
  line-height: 1.55;
}

.mistake-cards { display: grid; gap: 10px; margin-bottom: 28px; }
.mistake-card {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
}
.mistake-card__x {
  color: var(--cl-mistake);
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
}
.mistake-card__title {
  font-size: 14px;
  font-weight: 700;
  color: #991b1b;
  margin-bottom: 2px;
  font-family: var(--font-main);
}
.mistake-card__desc,
.mistake-card p {
  font-size: 12px;
  color: #7f1d1d;
  line-height: 1.6;
  margin: 0;
}

.theory {
  background: var(--cl-theory-bg);
  border: 1px solid var(--cl-theory-border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 28px;
}
.theory__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--cl-theory-text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-main);
}
.theory__body { font-size: 14px; line-height: 1.7; color: #0a3f45; }
.theory__body p { margin-bottom: 8px; }
.theory__body p:last-child { margin-bottom: 0; }
.theory__body strong { color: var(--cl-theory-text); }

.tnote,
.teacher-note {
  background: #fff7ed;
  border-left: 4px solid var(--cl-lifehack);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 22px;
  margin-bottom: 28px;
}
.tnote__lbl,
.teacher-note__label,
.teacher-note__title {
  font-size: 12px;
  font-weight: 700;
  color: var(--cl-lifehack);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 8px;
  font-family: var(--font-main);
}
.tnote p,
.teacher-note__body,
.teacher-note p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--cl-text);
  margin-bottom: 8px;
}
.tnote strong,
.teacher-note strong { color: var(--cl-lifehack); }

.faq { display: grid; gap: 10px; margin-bottom: 28px; }
.faq details,
.faq__item {
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq details summary,
.faq__item summary {
  padding: 14px 20px;
  cursor: pointer;
  font-weight: 600;
  color: var(--cl-dark);
  font-size: 14px;
  list-style: none;
  display: flex;
  gap: 10px;
  font-family: var(--font-main);
  transition: background var(--transition);
}
.faq details summary:hover,
.faq__item summary:hover { background: var(--cl-bg-alt); }
.faq details summary::-webkit-details-marker { display: none; }
.faq details summary::after,
.faq__item summary::after {
  content: '▾';
  margin-left: auto;
  color: var(--cl-primary);
  transition: transform var(--transition);
}
.faq details[open] summary::after,
.faq__item[open] summary::after { transform: rotate(180deg); }
.faq__a,
.faq__item-body {
  padding: 0 20px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cl-text);
}

.refs,
.ext-refs {
  background: var(--cl-bg-alt);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 28px;
}
.ext-refs__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--cl-dark);
  margin-bottom: 12px;
  font-family: var(--font-main);
}
.ext-refs__list {
  list-style: none;
  display: grid;
  gap: 8px;
}
.ref,
.ext-refs__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--cl-text);
  font-size: 14px;
  transition: border-color var(--transition);
  margin-bottom: 8px;
}
.ref:last-child,
.ext-refs__item:last-child { margin-bottom: 0; }
.ref:hover,
.ext-refs__item a:hover { border-color: var(--cl-primary); }
.ext-refs__item a { color: var(--cl-primary); text-decoration: none; }
.ref__type,
.ext-refs__type {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--accent-bg);
  color: var(--accent-text);
  text-transform: uppercase;
  letter-spacing: .04em;
  flex-shrink: 0;
  font-family: var(--font-main);
}
.ref__title { flex: 1; font-weight: 600; }

.nav-block {
  background: var(--cl-bg-alt);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 28px;
}
.nav-block h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--cl-dark);
  margin: 0 0 14px;
  font-family: var(--font-main);
}
.nav-links { display: flex; flex-direction: column; gap: 8px; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--cl-text);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  font-family: var(--font-main);
}
.nav-link:hover { border-color: var(--cl-primary); color: var(--cl-primary); }
.nav-link--up   { color: var(--cl-primary); font-weight: 700; }

.sibling-grid,
.subtopic-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  margin-top: 12px;
}
.sib-card,
.subtopic-grid .subtopic-card {
  display: block;
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  text-decoration: none;
  color: var(--cl-text);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  background: var(--cl-white);
  font-family: var(--font-main);
}
.sib-card:hover,
.subtopic-grid .subtopic-card:hover {
  border-color: var(--cl-primary);
  color: var(--cl-primary);
  transform: translateX(2px);
}
.subtopic-card__title { font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.subtopic-card__badge { font-size: 12px; color: var(--cl-primary); }

.related { display: grid; gap: 8px; margin-bottom: 28px; }
.related a {
  display: block;
  padding: 12px 16px;
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  color: var(--cl-dark);
  text-decoration: none;
  font-size: 14px;
  transition: all var(--transition);
}
.related a:hover { border-color: var(--cl-primary); color: var(--cl-primary); transform: translateX(2px); }

.nmt-cta {
  background: var(--cl-primary-gradient);
  padding: clamp(36px, 6vw, 56px) 32px;
  border-radius: var(--radius);
  text-align: center;
  color: #fff;
  margin: 48px 0 0;
}
.nmt-cta__title {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  margin-bottom: 10px;
  line-height: 1.25;
  font-family: var(--font-main);
}
.nmt-cta__sub {
  font-size: 14px;
  opacity: .92;
  margin-bottom: 22px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}
.nmt-cta__btn {
  display: inline-block;
  background: #fff;
  color: var(--cl-primary);
  padding: 14px 36px;
  border: none;
  border-radius: var(--radius-pill);
  font-family: var(--font-main);
  font-size: clamp(14px, 2vw, 18px);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.nmt-cta__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,.2);
}
.nmt-cta__note {
  font-size: 12px;
  opacity: .85;
  margin-top: 12px;
  color: #fff;
}

.pillar-hero {
  background: linear-gradient(135deg, #1e3a5f 0%, #0f766e 100%);
  color: #fff;
  padding: 40px 0 32px;
  margin: 25px auto;
  border-radius: 16px;
  width: 100%;
  max-width: var(--container-width);
}
.pillar-hero__inner {
  padding: 0 clamp(24px, 4vw, 48px);
}
.pillar-hero__kicker {
  font-size: 12px;
  color: #94d2bd;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 6px;
}
.pillar-hero__title {
  font-size: clamp(22px, 5.5vw, 42px);
  font-weight: 800;
  color: #fff !important;
  margin-bottom: 10px;
  line-height: 1.15;
  letter-spacing: -.3px;
  font-family: var(--font-main);
}
.pillar-hero__subtitle {
  font-size: 14px;
  color: #a7d8c8 !important;
  line-height: 1.6;
  margin-bottom: 18px;
  max-width: 640px;
}
.pillar-hero__stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.pillar-hero__stat {
  background: rgba(255,255,255,.14);
  color: #fff !important;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.article {
  margin: 32px auto 0;
}

.section {
  margin-bottom: 40px;
}
.section__title {
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  color: var(--cl-dark);
  margin: 0 0 18px;
  letter-spacing: -.3px;
}
.section__intro {
  font-size: 14px;
  line-height: 1.75;
  color: var(--cl-text);
  margin-bottom: 18px;
}

.quick-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 40px;
}
.quick-nav-card {
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}
.quick-nav-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.quick-nav-card::after {
  content: "↓";
  position: absolute;
  top: 18px;
  right: 20px;
  color: var(--accent);
  font-size: 18px;
  font-weight: 700;
  transition: transform var(--transition);
}
.quick-nav-card:hover::after { transform: translateY(3px); }
.quick-nav-card__icon { font-size: 26px; line-height: 1; }
.quick-nav-card__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-text);
  padding-right: 26px;
}
.quick-nav-card__desc {
  font-size: 12px;
  color: var(--cl-text-secondary);
  line-height: 1.55;
}

.subtopics-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 14px;
}
.subtopics-map .subtopic-card {
  background: var(--cl-white);
  border: 1px solid var(--cl-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
  display: block;
  position: relative;
}
.subtopics-map .subtopic-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.subtopics-map .subtopic-card::after {
  content: "→";
  position: absolute;
  top: 20px;
  right: 22px;
  font-size: 18px;
  color: var(--accent);
  transition: transform var(--transition);
}
.subtopics-map .subtopic-card:hover::after { transform: translateX(4px); }
.subtopics-map .subtopic-card__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-text);
  margin-bottom: 6px;
  padding-right: 26px;
}
.subtopics-map .subtopic-card__desc {
  font-size: 12px;
  color: var(--cl-text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
}
.subtopic-card__diff {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
}
.subtopic-card__diff--easy { background: #dcfce7; color: #166534; }
.subtopic-card__diff--mid  { background: #fef3c7; color: #92400e; }
.subtopic-card__diff--hard { background: #fee2e2; color: #991b1b; }

.cta {
  background: var(--cl-primary-gradient);
  padding: clamp(36px, 6vw, 56px) 32px;
  border-radius: var(--radius);
  text-align: center;
  color: var(--cl-white);
  margin: 0 auto 48px;
}
.cta__title {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.2;
}
.cta__text {
  font-size: 14px;
  opacity: .92;
  margin-bottom: 24px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}
.cta__submit {
  display: inline-block;
  background: var(--cl-white);
  color: var(--cl-primary);
  padding: 16px 40px;
  border-radius: var(--radius-pill);
  font-size: clamp(17px, 2.3vw, 20px);
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
}
.cta__submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,.2);
}
.cta__note {
  font-size: 12px;
  opacity: .85;
  margin-top: 16px;
  color: #fff;
}
.cta__phone-link {
  color: #fff;
  text-decoration: underline;
  font-weight: 600;
}
.prep-phase__content p {
  font-size: 14px;
}
.theory__body p {
  font-size: 14px;
}
.faq__item-body p {
  font-size: 14px;
}
.featured__question p {
  font-size: 14px;
}
.deep-intro {
    background: var(--cl-bg-alt);
    border-radius: var(--radius);
    padding: 24px 28px;
    margin-bottom: 40px;
}
.deep-intro__label {
    display: inline-block;
    background: var(--accent-bg);
    color: var(--accent-text);
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: .05em;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.deep-intro p {
    font-size: 14px;
    line-height: 1.75;
    color: var(--cl-text);
    margin-bottom: 12px;
}
.deep-intro p:last-child { margin-bottom: 0; }
.deep-intro strong { color: var(--accent-text); }

.figure-card__svg {
  background: var(--cl-bg);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
}
.figure-card__link {
    display: inline-block;
    margin-top: 10px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
}

.prep-plan {
    display: grid;
    gap: 14px;
}
.prep-phase {
    background: var(--cl-white);
    border-left: 4px solid var(--accent);
    border: 1px solid var(--cl-border);
    border-left: 4px solid var(--accent);
    border-radius: 10px;
    padding: 16px 20px;
}
.prep-phase__header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 8px;
}
.prep-phase__content {
    font-size: 14px;
    line-height: 1.7;
    color: var(--cl-text);
}
.prep-phase__name {
    font-size: 14px;
    font-weight: 700;
    color: var(--cl-dark);
}
.prep-phase__weeks {
    font-size: 12px;
    font-weight: 700;
    color: var(--accent-text);
    background: var(--accent-bg);
    padding: 3px 10px;
    border-radius: 10px;
}
.section-head-nmt-catalog {
    margin-top: 25px;
}

@media (max-width: 768px) {
  .byline {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }
}

@media (max-width: 600px) {
  .formula-grid, .formulas, .figures,
  .cheat-grid,
  .sibling-grid, .subtopic-grid, .subtopics-map,
  .mistake-cards,
  .quick-nav { grid-template-columns: 1fr; }

  .methodology, .method-steps { padding: 4px 16px; }
  .tldr { padding: 16px 18px; }
  .cheat-sheet, .ext-refs { padding: 16px; }
  .example { padding: 18px; }
  .nmt-cta, .cta { padding: 32px 20px; }
  .modal__dialog { padding: 24px 18px; }
}

@media (max-width: 480px) {
  .pillar-hero__inner { padding: 0 18px; }
  .pillar-hero { padding: 28px 0 22px; margin-top: 14px; }
  .pillar-hero__subtitle { font-size: 14px; }
  .figure-card,
  .subtopics-map .subtopic-card,
  .quick-nav-card { padding: 16px; }
  .featured { padding: 20px 16px; }
  .methodology { padding: 4px 16px; }
}

@media (max-width: 360px) {
  .pillar-hero__title { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

:focus-visible { outline: 2px solid var(--cl-primary); outline-offset: 2px; }