/* ── TOKENS ────────────────────────────────────────────── */
:root {
  --white:     #ffffff;
  --parchment: #f5f5f7;
  --border:    #d2d2d7;
  --text:      #1d1d1f;
  --text-soft: #6e6e73;
  --text-xs:   #86868b;
  --tile-dark: #1d1d1f;
  --tile-black:#000000;
  --blue:      #0066cc;
  --blue-sky:  #2997ff;
  --green:     #059669;
  --amber:     #d97706;
  --violet:    #7c3aed;
  --green-light: #ecfdf5;
  --accent-light: #fffbeb;
  --r-pill:    9999px;
  --r-card:    18px;
  --r-sm:      8px;
  --shadow:    rgba(0,0,0,.22) 3px 5px 30px;
  --shadow-sm: 0 2px 12px rgba(0,0,0,.08);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  background: var(--white);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── NAV ───────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand-icon {
  width: 44px;
  height: 44px;
  background: var(--blue);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.nav-brand-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
  line-height: 1.2;
}

.nav-brand-sub {
  font-size: 11px;
  color: var(--text-xs);
  font-weight: 500;
  letter-spacing: .01em;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-home {
  padding: 8px 16px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-soft);
  transition: all .2s;
  border: 1.5px solid transparent;
}
.nav-home:hover, .nav-home.active {
  background: var(--parchment);
  color: var(--text);
  border-color: var(--border);
}

.nav-btn {
  padding: 8px 18px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid;
  transition: all .2s;
}

.nav-btn.c1 { color: var(--blue);   background: #eff6ff; border-color: #bfdbfe; }
.nav-btn.c2 { color: var(--green);  background: #ecfdf5; border-color: #a7f3d0; }
.nav-btn.c3 { color: var(--amber);  background: #fffbeb; border-color: #fde68a; }
.nav-btn.c4 { color: var(--violet); background: #f5f3ff; border-color: #ddd6fe; }

.nav-btn:hover        { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(0,0,0,.12); }
.nav-btn.active.c1    { background: var(--blue);   color: #fff; border-color: var(--blue); }
.nav-btn.active.c2    { background: var(--green);  color: #fff; border-color: var(--green); }
.nav-btn.active.c3    { background: var(--amber);  color: #fff; border-color: var(--amber); }
.nav-btn.active.c4    { background: var(--violet); color: #fff; border-color: var(--violet); }
.nav-btn.active:hover { transform: none; box-shadow: none; }

/* ── HERO (main) ───────────────────────────────────────── */
.hero-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 24px 80px;
  position: relative;
  overflow: hidden;
  background: #000;
}

.hero-main-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: .3;
}

.hero-main-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,.5) 0%, rgba(0,20,60,.7) 100%);
}

.hero-main-content {
  position: relative;
  max-width: 740px;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--blue-sky);
  margin-bottom: 20px;
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp .6s .1s ease forwards;
}

.hero-main h1 {
  font-size: clamp(38px, 6vw, 68px);
  font-weight: 600;
  letter-spacing: -.035em;
  line-height: 1.05;
  color: #fff;
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp .65s .25s ease forwards;
}

.hero-main h1 em { font-style: normal; color: #93c5fd; }

.hero-main-sub {
  font-size: clamp(16px, 2vw, 21px);
  font-weight: 300;
  color: rgba(255,255,255,.65);
  line-height: 1.55;
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp .65s .4s ease forwards;
}

.hero-main-btns {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp .65s .55s ease forwards;
}

.hero-main-author {
  margin-top: 52px;
  font-size: 14px;
  color: rgba(255,255,255,.4);
  opacity: 0;
  animation: fadeUp .65s .7s ease forwards;
}

.hero-main-author strong { color: rgba(255,255,255,.7); font-weight: 500; }

/* ── HERO (grade pages) ────────────────────────────────── */
.hero-grade {
  min-height: 52vh;
  display: flex;
  align-items: flex-end;
  padding: 0 24px 64px;
  position: relative;
  overflow: hidden;
}

.hero-grade-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: .25;
}

.hero-grade-overlay {
  position: absolute;
  inset: 0;
}

.hero-grade.klass-1 .hero-grade-overlay { background: linear-gradient(135deg, rgba(0,30,80,.95) 0%, rgba(0,80,180,.8) 100%); }
.hero-grade.klass-2 .hero-grade-overlay { background: linear-gradient(135deg, rgba(2,44,34,.95) 0%, rgba(5,120,80,.8) 100%); }
.hero-grade.klass-3 .hero-grade-overlay { background: linear-gradient(135deg, rgba(60,30,0,.95) 0%, rgba(180,90,0,.8) 100%); }
.hero-grade.klass-4 .hero-grade-overlay { background: linear-gradient(135deg, rgba(30,10,60,.95) 0%, rgba(100,40,200,.8) 100%); }

.hero-grade-content {
  max-width: 1120px;
  margin: 0 auto;
  width: 100%;
  position: relative;
}

.hero-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,.5);
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 20px;
  padding: 5px 14px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--r-pill);
  transition: color .15s, border-color .15s;
}

.hero-back:hover { color: #fff; border-color: rgba(255,255,255,.4); }

.hero-grade-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 12px;
  font-size: 22px;
  margin-bottom: 16px;
}

.hero-grade h1 {
  font-size: clamp(44px, 8vw, 80px);
  font-weight: 600;
  letter-spacing: -.04em;
  color: #fff;
  line-height: 1;
  margin-bottom: 8px;
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp .55s .1s ease forwards;
}

.hero-grade-sub {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 300;
  color: rgba(255,255,255,.55);
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp .55s .25s ease forwards;
}

.hero-grade-desc {
  font-size: 16px;
  line-height: 1.65;
  color: rgba(255,255,255,.7);
  max-width: 560px;
  padding: 18px 22px;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--r-card);
  opacity: 0;
  animation: fadeUp .55s .4s ease forwards;
}

/* ── BUTTONS ───────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 14px 28px;
  background: var(--blue);
  color: #fff;
  border-radius: var(--r-pill);
  font-size: 17px;
  font-weight: 500;
  text-decoration: none;
  transition: background .2s, transform .15s;
}

.btn-primary:hover  { background: #0077ed; }
.btn-primary:active { transform: scale(.95); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 14px 28px;
  border: 1.5px solid rgba(255,255,255,.3);
  color: rgba(255,255,255,.85);
  border-radius: var(--r-pill);
  font-size: 17px;
  font-weight: 400;
  text-decoration: none;
  transition: border-color .2s, color .2s, transform .15s;
}

.btn-ghost:hover  { border-color: rgba(255,255,255,.7); color: #fff; }
.btn-ghost:active { transform: scale(.95); }

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-pill);
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  transition: border-color .2s, color .2s, transform .15s;
}

.btn-back:hover  { border-color: var(--blue); color: var(--blue); }
.btn-back:active { transform: scale(.96); }

/* ── TILES / SECTIONS ─────────────────────────────────── */
.tile           { padding: 96px 24px; }
.tile-white     { background: var(--white); }
.tile-parchment { background: var(--parchment); }
.tile-dark      { background: var(--tile-dark); }
.tile-black     { background: var(--tile-black); }

.tile-inner { max-width: 1120px; margin: 0 auto; }
hr           { border: none; border-top: 1px solid var(--border); }

.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.tile-white .eyebrow, .tile-parchment .eyebrow { color: var(--blue); }
.tile-dark  .eyebrow, .tile-black .eyebrow     { color: var(--blue-sky); }

.tile-title {
  font-size: clamp(26px, 3.5vw, 44px);
  font-weight: 600;
  letter-spacing: -.025em;
  line-height: 1.1;
  margin-bottom: 10px;
  color: var(--text);
}

.tile-dark .tile-title, .tile-black .tile-title { color: #fff; }

.tile-desc {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-soft);
  max-width: 560px;
  margin-bottom: 48px;
}

.tile-dark .tile-desc, .tile-black .tile-desc { color: rgba(255,255,255,.55); }

/* ── TYPE CARDS (виды ментальных карт) ───────────────── */
.types-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  text-align: left;
}

.type-card {
  background: var(--white);
  border-radius: var(--r-card);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: transform .3s, box-shadow .3s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.type-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }

.type-step {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 14px;
}

.type-card h3 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -.02em;
  margin-bottom: 10px;
}

.type-card p { font-size: 15px; line-height: 1.65; color: var(--text-soft); }

.type-bar {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
}

.type-card.c1 .type-bar { background: linear-gradient(90deg, #0066cc, #2997ff); }
.type-card.c2 .type-bar { background: linear-gradient(90deg, #059669, #34d399); }
.type-card.c3 .type-bar { background: linear-gradient(90deg, #d97706, #fbbf24); }

/* ── EXAMPLE / MINDMAP ──────────────────────────────── */
.example-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 52px;
  align-items: center;
  text-align: left;
}

.img-frame {
  border-radius: var(--r-card);
  overflow: hidden;
  background: #e8e8ed;
  aspect-ratio: 4/3;
  box-shadow: var(--shadow);
  position: relative;
}

.img-frame img { width: 100%; height: 100%; object-fit: cover; display: block; }

.tasks { display: flex; flex-direction: column; gap: 16px; }

.task {
  padding: 22px;
  border-radius: var(--r-card);
  background: var(--parchment);
}

.task-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 8px;
}

.task p { font-size: 15px; line-height: 1.65; }

.task-answers {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.ans {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--text-soft);
}

.ans::before { content: '›'; color: var(--blue); font-size: 16px; font-weight: 700; line-height: 1.1; flex-shrink: 0; }

/* ── GRAPHIC ───────────────────────────────────────────── */
.graphic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  text-align: left;
}

.g-card {
  background: var(--white);
  border-radius: var(--r-card);
  padding: 28px;
  transition: transform .3s, box-shadow .3s;
}

.g-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }

.g-icon { font-size: 36px; margin-bottom: 14px; }

.g-card h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.01em;
  margin-bottom: 12px;
}

.g-example {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-soft);
  padding: 10px 14px;
  background: var(--parchment);
  border-radius: var(--r-sm);
  margin-bottom: 8px;
}

.math-demo {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 18px;
  font-weight: 700;
  padding: 10px 14px;
  background: #fef3c7;
  border-radius: var(--r-sm);
  display: inline-block;
  margin-top: 4px;
  color: #78350f;
}

/* ── GRADE TILES ───────────────────────────────────────── */
.grades-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.grade-tile {
  border-radius: var(--r-card);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-decoration: none;
  transition: transform .3s, box-shadow .3s;
  cursor: default;
}

.grade-tile.avail { cursor: pointer; }

.grade-tile.avail.c1 { background: var(--blue); color: #fff; box-shadow: 0 4px 24px rgba(0,102,204,.3); }
.grade-tile.avail.c2 { background: var(--green); color: #fff; box-shadow: 0 4px 24px rgba(5,150,105,.3); }
.grade-tile.avail.c3 { background: var(--amber); color: #fff; box-shadow: 0 4px 24px rgba(215,119,0,.3); }
.grade-tile.avail.c4 { background: var(--violet); color: #fff; box-shadow: 0 4px 24px rgba(124,58,237,.3); }

.grade-tile.avail:hover { transform: scale(1.04); box-shadow: 0 12px 40px rgba(0,0,0,.25); }
.grade-tile.avail:active { transform: scale(.97); }

.grade-tile.locked {
  background: rgba(255,255,255,.05);
  border: 1px dashed rgba(255,255,255,.15);
  color: rgba(255,255,255,.3);
}

.grade-tile-icon { font-size: 36px; }

.grade-tile-name {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -.02em;
}

.grade-tile-soon {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  opacity: .5;
}

/* ── QUOTE ─────────────────────────────────────────────── */
.quote-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 52px;
  align-items: center;
  text-align: left;
}

.quote-body {
  font-size: 17px;
  line-height: 1.8;
  color: rgba(255,255,255,.7);
}

.quote-body p + p { margin-top: 14px; }

.big-quote {
  padding: 44px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-card);
}

.big-quote-mark {
  font-size: 64px;
  line-height: .7;
  color: var(--blue-sky);
  opacity: .35;
  font-family: Georgia, serif;
  margin-bottom: 14px;
}

.big-quote p {
  font-size: 21px;
  font-weight: 500;
  line-height: 1.5;
  color: rgba(255,255,255,.9);
  letter-spacing: -.01em;
}

/* ── CONTACTS ──────────────────────────────────────────── */
.contacts-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.contact-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  transition: all .2s;
}

.contact-pill:hover { border-color: var(--blue); background: #eff6ff; color: var(--blue); transform: scale(1.02); }
.contact-pill:active { transform: scale(.97); }

/* ── TOPIC GRID (grade pages) ─────────────────────────── */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.count-badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-xs);
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  white-space: nowrap;
}

.tile-dark .count-badge { color: rgba(255,255,255,.4); border-color: rgba(255,255,255,.15); }

.topics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.topic-card {
  border-radius: var(--r-card);
  padding: 22px 18px;
  background: var(--white);
  border: 1px solid var(--border);
  position: relative;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  color: inherit;
  display: block;
}

.tile-dark .topic-card { background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.08); }

.topic-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.tile-dark .topic-card:hover { border-color: rgba(255,255,255,.2); }

.topic-n {
  position: absolute;
  top: 12px; right: 12px;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-xs);
  background: var(--parchment);
  padding: 2px 6px;
  border-radius: 5px;
}

.tile-dark .topic-n { background: rgba(255,255,255,.08); color: rgba(255,255,255,.3); }

.topic-icon { font-size: 26px; margin-bottom: 10px; }

.topic-name {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
}

.tile-dark .topic-name { color: rgba(255,255,255,.85); }

/* ── PHOTOS ────────────────────────────────────────────── */
.photos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.photo-frame {
  border-radius: var(--r-card);
  overflow: hidden;
  background: #e8e8ed;
  aspect-ratio: 4/3;
  position: relative;
  box-shadow: var(--shadow);
  transition: transform .3s;
}

.photo-frame:hover { transform: scale(1.02); }

.photo-frame img { width: 100%; height: 100%; object-fit: cover; display: block; }

.photo-label {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,.55));
  color: rgba(255,255,255,.9);
  font-size: 12px;
  font-weight: 600;
  padding: 20px 14px 10px;
}

.photo-bg-1 { background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 60%, #3b82f6 100%); }
.photo-bg-2 { background: linear-gradient(135deg, #14532d 0%, #16a34a 60%, #4ade80 100%); }
.photo-bg-3 { background: linear-gradient(135deg, #4c1d95 0%, #7c3aed 60%, #a78bfa 100%); }

.photo-illus {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}

.photo-illus-icon {
  font-size: 44px;
  margin-bottom: 14px;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,.3));
}

.photo-illus-text {
  font-size: 16px;
  font-weight: 700;
  color: rgba(255,255,255,.95);
  margin-bottom: 6px;
  letter-spacing: -.01em;
}

.photo-illus-sub {
  font-size: 12px;
  color: rgba(255,255,255,.55);
  line-height: 1.4;
}

/* ── BACK SECTION ──────────────────────────────────────── */
.back-section {
  padding: 64px 24px;
  text-align: center;
  background: var(--parchment);
  border-top: 1px solid var(--border);
}

/* ── FOOTER ────────────────────────────────────────────── */
footer {
  background: var(--parchment);
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  font-size: 12px;
  color: var(--text-xs);
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

footer strong { color: var(--text-soft); font-weight: 600; }

/* ── ANIMATIONS ────────────────────────────────────────── */
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s ease, transform .65s ease;
}

.reveal.visible     { opacity: 1; transform: translateY(0); }
.reveal-d1          { transition-delay: .08s; }
.reveal-d2          { transition-delay: .16s; }
.reveal-d3          { transition-delay: .24s; }
.reveal-d4          { transition-delay: .32s; }

/* ── MINDMAP DEMO ──────────────────────────────────────── */
.mindmap-demo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 40px 24px;
  background: var(--white);
  border-radius: var(--r-card);
  box-shadow: var(--shadow);
}
.mm-root {
  background: var(--blue);
  color: white;
  padding: 14px 28px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  position: relative;
  z-index: 1;
}
.mm-connector-v {
  width: 2px;
  height: 28px;
  background: var(--border);
}
.mm-connector-h {
  height: 2px;
  background: var(--border);
  align-self: stretch;
  margin: 0 40px;
}
.mm-branches {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  position: relative;
}
.mm-branches::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 2px;
  background: var(--border);
}
.mm-branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}
.mm-branch-line {
  width: 2px;
  height: 20px;
  background: var(--border);
}
.mm-node {
  padding: 10px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  border: 2px solid;
}
.mm-node.c1 { background: #eff6ff; color: var(--blue); border-color: #bfdbfe; }
.mm-node.c2 { background: var(--green-light, #ecfdf5); color: var(--green); border-color: #a7f3d0; }
.mm-node.c3 { background: var(--accent-light, #fffbeb); color: var(--amber); border-color: #fde68a; }
.mm-leaves {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
  justify-content: center;
  max-width: 160px;
}
.mm-leaf {
  padding: 5px 12px;
  background: var(--parchment);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-soft);
}

/* ── FEATURE CARDS (vid pages) ─────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 0;
}

.feature-card {
  background: var(--parchment);
  border-radius: var(--r-card);
  padding: 28px;
  text-align: left;
}

.feature-icon { font-size: 32px; margin-bottom: 12px; }

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ── STATS STRIP ───────────────────────────────────────── */
.stats-strip {
  background: var(--tile-black);
  border-bottom: 1px solid rgba(255,255,255,.07);
  padding: 0 24px;
}

.stats-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 36px 0;
  gap: 0;
}

.stat-item {
  text-align: center;
  flex: 1;
}

.stat-num {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -.04em;
  color: var(--blue-sky);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 13px;
  color: rgba(255,255,255,.45);
  font-weight: 500;
  line-height: 1.4;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: rgba(255,255,255,.1);
  flex-shrink: 0;
}

/* ── ZPR SECTION ───────────────────────────────────────── */
.zpr-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.zpr-cards {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.zpr-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--white);
  border-radius: var(--r-card);
  border: 1px solid var(--border);
  transition: transform .25s, box-shadow .25s;
}

.zpr-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }

.zpr-card-icon {
  font-size: 26px;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eff6ff;
  border-radius: 10px;
}

.zpr-card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.zpr-card-desc {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-soft);
}

/* ── TYPE LIST ─────────────────────────────────────────── */
.type-list {
  margin-top: 14px;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.type-list li {
  font-size: 13px;
  color: var(--text-soft);
  padding: 5px 10px;
  background: var(--parchment);
  border-radius: 6px;
  line-height: 1.4;
}

.type-list li::before { content: '› '; color: var(--blue); font-weight: 700; }

/* ── BIG MIND MAP ──────────────────────────────────────── */
.bigmap {
  background: var(--parchment);
  border-radius: 24px;
  padding: 52px 40px;
  box-shadow: 0 4px 40px rgba(0,0,0,.08);
}

.bm-center-col {
  display: flex;
  justify-content: center;
  margin-bottom: 36px;
}

.bm-root {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #003d99, #0066cc);
  color: #fff;
  padding: 24px 44px;
  border-radius: 40px;
  box-shadow: 0 8px 32px rgba(0,102,204,.35);
}

.bm-root-icon { font-size: 38px; }
.bm-root-label { font-size: 22px; font-weight: 700; letter-spacing: -.02em; }

.bm-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.bm-branch-card {
  border-radius: var(--r-card);
  padding: 20px 16px;
  text-align: center;
  transition: transform .25s, box-shadow .25s;
}

.bm-branch-card:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,0,0,.15); }

.bc-blue   { background: #eff6ff; border: 2px solid #bfdbfe; }
.bc-green  { background: #ecfdf5; border: 2px solid #a7f3d0; }
.bc-amber  { background: #fffbeb; border: 2px solid #fde68a; }
.bc-violet { background: #f5f3ff; border: 2px solid #ddd6fe; }
.bc-teal   { background: #f0fdfa; border: 2px solid #99f6e4; }

.bc-icon { font-size: 28px; margin-bottom: 8px; }

.bc-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.01em;
  margin-bottom: 14px;
}

.bc-blue   .bc-name { color: var(--blue); }
.bc-green  .bc-name { color: var(--green); }
.bc-amber  .bc-name { color: var(--amber); }
.bc-violet .bc-name { color: var(--violet); }
.bc-teal   .bc-name { color: #0d9488; }

.bc-leaves {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.bc-leaf {
  font-size: 12px;
  font-weight: 500;
  padding: 5px 8px;
  background: rgba(255,255,255,.7);
  border-radius: 8px;
  color: var(--text);
  line-height: 1.3;
}

.bm-arrow-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 16px;
}

.bm-arrow-line {
  width: 2px;
  height: 20px;
  background: linear-gradient(to bottom, var(--blue), var(--border));
}

.bm-arrow-spread {
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--border) 15%, var(--border) 85%, transparent 100%);
}

.bm-legend {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.bm-legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
}

.bl-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.bd-blue   { background: var(--blue); }
.bd-green  { background: var(--green); }
.bd-amber  { background: var(--amber); }
.bd-violet { background: var(--violet); }
.bd-teal   { background: #0d9488; }

/* ── EFFECTS GRID ──────────────────────────────────────── */
.effects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.effect-card {
  padding: 28px 24px;
  background: var(--parchment);
  border-radius: var(--r-card);
  border: 1px solid var(--border);
  transition: transform .25s, box-shadow .25s;
}

.effect-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }

.effect-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: .05em;
  margin-bottom: 10px;
}

.effect-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -.01em;
  margin-bottom: 8px;
  color: var(--text);
}

.effect-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ── SVG MIND MAP (legacy) ─────────────────────────────── */
.mm-svg-wrap {
  background: #f1f5f9;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 6px 40px rgba(0,0,0,.10);
}

/* ── MARKMAP MIND MAP ──────────────────────────────────── */
.mm-markmap-wrap {
  background: #fff;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 4px 32px rgba(0,0,0,.08), 0 1px 3px rgba(0,0,0,.06);
  border: 1px solid #e2e8f0;
}

.mm-markmap-wrap .markmap {
  display: block;
  width: 100%;
}

.mm-markmap-wrap svg {
  display: block;
}

/* Draw-in animation for paths */
.mm-path {
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
}

/* Branch nodes hidden until animated */
.mm-branch { opacity: 0; }

/* Trigger on viewport entry */
.mm-svg-wrap.visible .mm-path {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.65s cubic-bezier(0.4, 0, 0.2, 1);
}
.mm-svg-wrap.visible .mm-branch {
  opacity: 1;
  transition: opacity 0.5s ease;
}

.mm-svg-wrap.visible .mm-p1 { transition-delay: 0.15s; }
.mm-svg-wrap.visible .mm-p2 { transition-delay: 0.30s; }
.mm-svg-wrap.visible .mm-p3 { transition-delay: 0.45s; }
.mm-svg-wrap.visible .mm-p4 { transition-delay: 0.60s; }
.mm-svg-wrap.visible .mm-p5 { transition-delay: 0.75s; }

.mm-svg-wrap.visible .mm-b1 { transition-delay: 0.70s; }
.mm-svg-wrap.visible .mm-b2 { transition-delay: 0.85s; }
.mm-svg-wrap.visible .mm-b3 { transition-delay: 1.00s; }
.mm-svg-wrap.visible .mm-b4 { transition-delay: 1.15s; }
.mm-svg-wrap.visible .mm-b5 { transition-delay: 1.30s; }

.mm-svg-legend {
  display: flex;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
  padding: 18px 24px;
  border-top: 1px solid var(--border);
  background: var(--white);
}

.msl-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-soft);
}

.msl-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── GRADE TILE HINT ───────────────────────────────────── */
.grade-tile-hint {
  font-size: 12px;
  font-weight: 500;
  color: rgba(255,255,255,.55);
  letter-spacing: .01em;
  margin-top: -4px;
}

/* ── RESPONSIVE ────────────────────────────────────────── */
@media (max-width: 1000px) {
  .types-grid, .graphic-grid, .features-grid { grid-template-columns: 1fr 1fr; }
  .example-layout, .quote-layout, .zpr-layout { grid-template-columns: 1fr; }
  .grades-grid { grid-template-columns: 1fr 1fr; }
  .topics-grid { grid-template-columns: repeat(3, 1fr); }
  .photos-grid { grid-template-columns: 1fr 1fr; }
  .bm-grid { grid-template-columns: repeat(3, 1fr); }
  .effects-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .types-grid, .graphic-grid, .features-grid { grid-template-columns: 1fr; }
  .grades-grid { grid-template-columns: 1fr 1fr; }
  .topics-grid { grid-template-columns: 1fr 1fr; }
  .photos-grid { grid-template-columns: 1fr; }
  .bm-grid { grid-template-columns: 1fr 1fr; }
  .effects-grid { grid-template-columns: 1fr; }
  .stats-inner { flex-wrap: nowrap; gap: 8px; padding: 26px 4px; }
  .stat-item { flex: 1 1 0; min-width: 0; }
  .stat-divider { display: none; }
  .stat-num { font-size: 30px; }
  .stat-label { font-size: 11px; line-height: 1.3; }
  .bigmap { padding: 28px 16px; }
  .mm-branches { flex-direction: column; align-items: center; }
  .mm-branches::before { display: none; }

  /* Ментальная карта на телефоне: вписываем по ширине и центрируем —
     масштаб считает JS (scaleMindmaps). Ветки раскрываются по тапу,
     стили см. в блоке .mm-open ниже. */
  .mm-section { margin-bottom: 40px; }

  /* Меньше воздуха в секциях на телефоне */
  .tile { padding: 60px 18px; }
  .hero-main { padding: 92px 18px 64px; }

  /* ── NAV: компактная, кнопки прокручиваются по горизонтали ── */
  .nav-inner { padding: 0 12px; gap: 8px; height: 60px; }
  .nav-brand-icon { width: 36px; height: 36px; font-size: 18px; border-radius: 10px; }
  .nav-brand-title { font-size: 13px; }
  .nav-brand-sub { display: none; }
  .nav-right {
    flex: 1 1 0;
    min-width: 0;
    justify-content: flex-start;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .nav-right::-webkit-scrollbar { display: none; }
  .nav-home, .nav-btn { flex-shrink: 0; white-space: nowrap; }
  .nav-btn  { padding: 9px 14px; font-size: 13px; border-width: 1.5px; }
  .nav-home { padding: 9px 13px; font-size: 13px; }
}

@media (max-width: 400px) {
  /* На самых узких экранах прячем подпись бренда — место под кнопки */
  .nav-brand-title { display: none; }
  .nav-btn  { padding: 8px 12px; font-size: 12px; }
  .nav-home { padding: 8px 11px; font-size: 12px; }
}

/* ═══════════════════════════════════════════════════════════════
   Тач-экраны: глушим «залипающий» :hover, чтобы ветка раскрывалась
   ТОЛЬКО по тапу (класс .mm-open) и закрывалась повторным тапом.
   ═══════════════════════════════════════════════════════════════ */
@media (hover: none) {
  .mm-card:hover { transform: none !important; }
  .mm-card:hover .mm-card-body {
    max-height: 0 !important;
    padding-bottom: 0 !important;
    border-top-color: transparent !important;
  }
  .mm-card:hover .mm-card-body p { opacity: 0 !important; transform: translateY(6px) !important; }
  .mm-card:hover .mm-chevron { transform: none !important; opacity: 0.22 !important; }
  .mm-n-sravnenie:hover .mm-card-body,
  .mm-n-geometriya:hover .mm-card-body,
  .mm-pos-l2:hover .mm-card-body,
  .mm-pos-r3:hover .mm-card-body {
    padding-top: 0 !important;
    border-bottom-color: transparent !important;
  }
}

/* ═══════════════════════════════════════════════════════════════
   Раскрытие ветки по тапу: класс .mm-open повторяет состояние :hover,
   включается по клику из JS на тач-устройствах и перебивает
   заглушённый выше :hover (объявлен ПОЗЖЕ → выигрывает при равной
   важности и специфичности).
   ═══════════════════════════════════════════════════════════════ */
.mm-card.mm-open {
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.07),
    0 4px 16px rgba(0,0,0,0.10),
    0 16px 40px rgba(0,0,0,0.08) !important;
  transform: translateY(-4px) scale(1.02) !important;
  z-index: 20;
}
.mm-card.mm-open .mm-chevron { transform: rotate(90deg) !important; opacity: 0.6 !important; }
.mm-card.mm-open .mm-card-body {
  max-height: 240px !important;
  padding-bottom: 14px !important;
  border-top-color: rgba(0,0,0,0.06) !important;
}
.mm-card.mm-open .mm-card-body p { opacity: 1 !important; transform: translateY(0) !important; }
.mm-card.mm-open .mm-card-body p:nth-child(1) { transition-delay: 0.04s; }
.mm-card.mm-open .mm-card-body p:nth-child(2) { transition-delay: 0.08s; }
.mm-card.mm-open .mm-card-body p:nth-child(3) { transition-delay: 0.12s; }
.mm-card.mm-open .mm-card-body p:nth-child(4) { transition-delay: 0.16s; }
/* Нижние карточки раскрываются вверх */
.mm-n-sravnenie.mm-open .mm-card-body,
.mm-n-geometriya.mm-open .mm-card-body,
.mm-pos-l2.mm-open .mm-card-body,
.mm-pos-r3.mm-open .mm-card-body {
  border-top-color: transparent !important;
  border-bottom-color: rgba(0,0,0,0.06) !important;
  padding-top: 12px !important;
  padding-bottom: 0 !important;
}

/* ═══════════════════════════════════════════════════════
   ENHANCED INTERACTIONS & MODERN UI
   ═══════════════════════════════════════════════════════ */

/* Hero gradient background (replaces Wikimedia photo) */
.hero-bg-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 30% -10%, rgba(37,99,235,.55) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 110%, rgba(99,102,241,.35) 0%, transparent 55%),
    linear-gradient(160deg, #0a1628 0%, #0f1e3a 50%, #0a0f1e 100%);
}

/* ── TYPE CARDS: collapsible list + hover reveal ─────── */

/* Override earlier type-list: collapsed by default */
.type-list {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  transition: max-height 0.48s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.32s ease,
              margin-top 0.36s ease;
}

.type-card:hover .type-list {
  max-height: 160px;
  opacity: 1;
  margin-top: 14px;
}

/* Hint "Открыть подробнее →" */
.type-card-hint {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: .01em;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.28s ease 0.06s,
              transform 0.28s ease 0.06s;
}

.type-card:hover .type-card-hint {
  opacity: 1;
  transform: translateY(0);
}

/* Override earlier type-card hover */
.type-card {
  transition: transform 0.34s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              box-shadow 0.34s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.type-card:hover {
  transform: translateY(-10px) scale(1.015);
  box-shadow: 0 28px 72px rgba(0,0,0,0.14);
}

/* ── EFFECT CARDS: subtle lift ───────────────────────── */
.effect-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.effect-card:hover {
  transform: translateY(-6px) !important;
  box-shadow: var(--shadow-sm);
}

/* ── ZPR CARDS: subtle lift ──────────────────────────── */
.zpr-card {
  transition: transform 0.28s ease,
              box-shadow 0.28s ease,
              background 0.28s ease,
              border-color 0.28s ease;
}

.zpr-card:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 12px 40px rgba(0,102,204,.12);
  background: #f5f9ff;
  border-color: #bfdbfe;
}

/* ── GRAPHIC CARDS ───────────────────────────────────── */
.g-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.g-card:hover {
  transform: translateY(-6px) !important;
  box-shadow: var(--shadow-sm);
}

/* ── GRADE TILES: stronger hover ─────────────────────── */
.grade-tile.avail {
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              box-shadow 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              filter 0.25s ease;
}

.grade-tile.avail:hover {
  transform: scale(1.07) translateY(-6px);
  box-shadow: 0 24px 64px rgba(0,0,0,0.32);
  filter: brightness(1.06);
}

.grade-tile.avail:active {
  transform: scale(0.97);
  transition-duration: 0.1s;
}

/* ── METODIKA CTA ────────────────────────────────────── */
.metodika-cta {
  margin-top: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-metodika {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 34px;
  background: var(--blue);
  color: #fff;
  border-radius: var(--r-pill);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -.01em;
  box-shadow: 0 4px 24px rgba(0,102,204,.38);
  transition: background 0.2s, transform 0.18s, box-shadow 0.2s;
}

.btn-metodika:hover {
  background: #0077ed;
  transform: translateY(-2px);
  box-shadow: 0 10px 36px rgba(0,102,204,.48);
}

.btn-metodika:active { transform: scale(0.97); }

/* ── REVEAL: slightly refined ────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.62s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.62s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── ZPR CARD ICON: blue tint ───────────────────────── */
.zpr-card:hover .zpr-card-icon {
  background: #dbeafe;
  transition: background 0.28s ease;
}

/* ═══════════════════════════════════════════════════════════════
   MIND MAP — Notion × Apple design
   HTML/CSS board with bounce-chain animations + hover expand
   ═══════════════════════════════════════════════════════════════ */

/* Outer wrapper: clips the fixed-size board, adjusts height via JS */
.mm-outer {
  width: 100%;
  overflow: hidden;
  border-radius: 20px;
  background: #fafaf9;
  box-shadow: 0 2px 20px rgba(0,0,0,.07), 0 1px 4px rgba(0,0,0,.04);
}

/* Scale wrapper: JS sets transform: scale(X) on this */
.mm-scale-wrap {
  width: 960px;
  height: 540px;
  transform-origin: top left;
}

/* The 960×540 canvas for all cards + SVG lines */
.mm-board {
  position: relative;
  width: 960px;
  height: 540px;
  background: #f5f5f7;
  background-image: radial-gradient(circle, #d1d1d6 1px, transparent 1px);
  background-size: 28px 28px;
}

/* SVG lines layer (behind cards) */
.mm-lines-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Connection lines — animate in via stroke-dashoffset */
.mm-line {
  stroke-dasharray: 700;
  stroke-dashoffset: 700;
  transition: stroke-dashoffset 0s;
}

/* Endpoint dots — hidden initially */
.mm-dot {
  opacity: 0;
  transition: opacity 0.25s ease;
}

/* ─── Base card ─── */
.mm-card {
  position: absolute;
  width: 200px;
  background: #ffffff;
  border-radius: 18px;
  border: 1px solid rgba(0,0,0,0.07);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.06);
  overflow: hidden;
  cursor: pointer;
  z-index: 1;
  /* Initial hidden state — animation takes over when .active is added */
  opacity: 0;
  transform: scale(0.5) translateX(var(--mm-tx, 0px));
  transition:
    box-shadow 0.28s ease,
    transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Hover: lift + deeper shadow — !important overrides animation fill state */
.mm-card:hover {
  box-shadow: 0 8px 36px rgba(0,0,0,0.13), 0 2px 8px rgba(0,0,0,0.07) !important;
  transform: translateY(-4px) scale(1.02) !important;
  z-index: 20;
}

/* ─── Card header ─── */
.mm-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  min-height: 54px;
  box-sizing: border-box;
  user-select: none;
}

.mm-ico-wrap {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
  flex-shrink: 0;
}

.mm-card-name {
  font-size: 13px;
  font-weight: 700;
  color: #1d1d1f;
  flex: 1;
  letter-spacing: -0.2px;
  font-family: system-ui, -apple-system, sans-serif;
}

.mm-chevron {
  font-size: 20px;
  font-weight: 300;
  opacity: 0.3;
  color: #1d1d1f;
  display: inline-block;
  line-height: 1;
  transition: transform 0.38s cubic-bezier(0.34, 1.56, 0.64, 1),
              opacity 0.22s ease;
}

.mm-card:hover .mm-chevron {
  transform: rotate(90deg);
  opacity: 0.75;
}

/* ─── Card body: max-height expand with spring easing ─── */
.mm-card-body {
  max-height: 0;
  overflow: hidden;
  padding: 0 14px;
  border-top: 1px solid transparent;
  transition:
    max-height 0.46s cubic-bezier(0.34, 1.56, 0.64, 1),
    padding-bottom 0.3s ease,
    border-color 0.2s ease;
}

.mm-card:hover .mm-card-body {
  max-height: 220px;
  padding-bottom: 14px;
  border-top-color: rgba(0,0,0,0.06);
}

/* Body items: staggered slide-up on hover */
.mm-card-body p {
  font-size: 12px;
  line-height: 1.55;
  color: #555;
  padding: 5px 0;
  margin: 0;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.24s ease, transform 0.28s cubic-bezier(0.34, 1.56, 0.64, 1);
  font-family: system-ui, -apple-system, sans-serif;
}
.mm-card-body p:last-child { border-bottom: none; }

.mm-card:hover .mm-card-body p               { opacity: 1; transform: translateY(0); }
.mm-card:hover .mm-card-body p:nth-child(1)  { transition-delay: 0.05s; }
.mm-card:hover .mm-card-body p:nth-child(2)  { transition-delay: 0.10s; }
.mm-card:hover .mm-card-body p:nth-child(3)  { transition-delay: 0.15s; }
.mm-card:hover .mm-card-body p:nth-child(4)  { transition-delay: 0.20s; }

/* ─── Center pill node ─── */
.mm-card-center {
  position: absolute;
  left: 370px;
  top: 210px;
  width: 220px;
  height: 90px;
  border-radius: 9999px;
  background: linear-gradient(135deg, #5645d4 0%, #3a2a99 100%);
  border: none;
  box-shadow: 0 4px 28px rgba(86,69,212,0.42), 0 1px 4px rgba(86,69,212,0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: default;
  z-index: 2;
  gap: 2px;
  opacity: 0;
  transform: scale(0.3);
}

.mm-card-center:hover {
  box-shadow: 0 8px 44px rgba(86,69,212,0.52), 0 2px 8px rgba(86,69,212,0.22) !important;
  transform: scale(1.04) !important;
}

.mm-center-emoji { font-size: 22px; line-height: 1; }
.mm-center-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.3px;
  font-family: system-ui, -apple-system, sans-serif;
}
.mm-center-sub {
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  font-family: system-ui, -apple-system, sans-serif;
}

/* ─── Branch card positions (absolute px in 960×540 space) ─── */
.mm-n-schet      { left: 10px;  top: 100px; --mm-tx: 240px; }
.mm-n-sravnenie  { left: 10px;  top: 368px; --mm-tx: 240px; }
.mm-n-slozhenie  { left: 750px; top:  45px; --mm-tx:-240px; }
.mm-n-vychitanie { left: 750px; top: 228px; --mm-tx:-240px; }
.mm-n-geometriya { left: 750px; top: 395px; --mm-tx:-240px; }

/* ─── Color themes (Notion pastel × Apple clarity) ─── */
.mm-n-schet      { border-top: 3px solid #7c3aed; }
.mm-n-schet .mm-ico-wrap   { background: #ede9fe; }
.mm-n-schet .mm-card-name  { color: #4c1d95; }
.mm-n-schet .mm-card-body p { color: #6d28d9; }
.mm-n-schet .mm-chevron    { color: #7c3aed; }

.mm-n-sravnenie     { border-top: 3px solid #16a34a; }
.mm-n-sravnenie .mm-ico-wrap   { background: #dcfce7; }
.mm-n-sravnenie .mm-card-name  { color: #14532d; }
.mm-n-sravnenie .mm-card-body p { color: #15803d; }
.mm-n-sravnenie .mm-chevron    { color: #16a34a; }

.mm-n-slozhenie     { border-top: 3px solid #ea580c; }
.mm-n-slozhenie .mm-ico-wrap   { background: #ffedd5; }
.mm-n-slozhenie .mm-card-name  { color: #7c2d12; }
.mm-n-slozhenie .mm-card-body p { color: #9a3412; }
.mm-n-slozhenie .mm-chevron    { color: #ea580c; }

.mm-n-vychitanie    { border-top: 3px solid #e11d48; }
.mm-n-vychitanie .mm-ico-wrap   { background: #ffe4e6; }
.mm-n-vychitanie .mm-card-name  { color: #881337; }
.mm-n-vychitanie .mm-card-body p { color: #9f1239; }
.mm-n-vychitanie .mm-chevron    { color: #e11d48; }

.mm-n-geometriya    { border-top: 3px solid #0284c7; }
.mm-n-geometriya .mm-ico-wrap   { background: #e0f2fe; }
.mm-n-geometriya .mm-card-name  { color: #0c4a6e; }
.mm-n-geometriya .mm-card-body p { color: #0369a1; }
.mm-n-geometriya .mm-chevron    { color: #0284c7; }

/* ─── Entry keyframes ─── */
@keyframes mm-center-in {
  0%   { opacity: 0; transform: scale(0.25); }
  55%  { transform: scale(1.12); }
  75%  { transform: scale(0.93); }
  90%  { transform: scale(1.04); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes mm-branch-in {
  0%   { opacity: 0; transform: scale(0.45) translateX(var(--mm-tx, 0px)); }
  45%  { opacity: 1; }
  65%  { transform: scale(1.09) translateX(0); }
  80%  { transform: scale(0.95) translateX(0); }
  92%  { transform: scale(1.02) translateX(0); }
  100% { opacity: 1; transform: scale(1) translateX(0); }
}

/* ─── Trigger animations when board becomes .active ─── */
.mm-board.active .mm-card-center {
  animation: mm-center-in 0.65s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s both;
}
/* Left branches fly in from the right (bounce from center) */
.mm-board.active .mm-n-schet {
  animation: mm-branch-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.52s both;
}
.mm-board.active .mm-n-sravnenie {
  animation: mm-branch-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.68s both;
}
/* Right branches fly in from the left */
.mm-board.active .mm-n-slozhenie {
  animation: mm-branch-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.60s both;
}
.mm-board.active .mm-n-vychitanie {
  animation: mm-branch-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.76s both;
}
.mm-board.active .mm-n-geometriya {
  animation: mm-branch-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.92s both;
}

/* Lines draw out slightly ahead of each card appearing */
.mm-board.active .mm-line-1 {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s cubic-bezier(0.4,0,0.2,1) 0.46s;
}
.mm-board.active .mm-line-2 {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s cubic-bezier(0.4,0,0.2,1) 0.62s;
}
.mm-board.active .mm-line-3 {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s cubic-bezier(0.4,0,0.2,1) 0.54s;
}
.mm-board.active .mm-line-4 {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s cubic-bezier(0.4,0,0.2,1) 0.70s;
}
.mm-board.active .mm-line-5 {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s cubic-bezier(0.4,0,0.2,1) 0.86s;
}

/* Dots appear with each line */
.mm-board.active .mm-dot-1 { opacity: 1; transition-delay: 0.95s; }
.mm-board.active .mm-dot-2 { opacity: 1; transition-delay: 1.11s; }
.mm-board.active .mm-dot-3 { opacity: 1; transition-delay: 1.03s; }
.mm-board.active .mm-dot-4 { opacity: 1; transition-delay: 1.19s; }
.mm-board.active .mm-dot-5 { opacity: 1; transition-delay: 1.35s; }

/* ═══════════════════════════════════════════════════════════════
   MIND MAP REFINEMENTS: overflow fix + premium aesthetic
   ═══════════════════════════════════════════════════════════════ */

/* Cards need to be flex containers for column-reverse to work */
.mm-card {
  display: flex;
  flex-direction: column;
}

/* ── FIX: bottom-anchored cards expand upward (prevent clip) ── */
/* Сравнение and Геометрия sit near the board bottom — expand upward */
.mm-n-sravnenie {
  top: auto !important;
  bottom: 116px;          /* anchors bottom edge at y≈424, compact top stays ~368 */
  flex-direction: column-reverse;   /* body above header visually */
  border-top: none !important;
  border-bottom: 2px solid #16a34a; /* accent moves to visual bottom */
}
.mm-n-geometriya {
  top: auto !important;
  bottom: 89px;           /* anchors bottom edge at y≈449, compact top stays ~395 */
  flex-direction: column-reverse;
  border-top: none !important;
  border-bottom: 2px solid #0284c7;
}

/* Divider for upward-expanding cards: between body (above) and header (below) */
.mm-n-sravnenie .mm-card-body,
.mm-n-geometriya .mm-card-body {
  border-top: none;
  border-bottom: 1px solid transparent;
  padding-top: 0;
  padding-bottom: 0;
  transition: max-height 0.46s cubic-bezier(0.34, 1.56, 0.64, 1),
              padding 0.3s ease,
              border-color 0.2s ease;
}
.mm-n-sravnenie:hover .mm-card-body,
.mm-n-geometriya:hover .mm-card-body {
  border-top-color: transparent !important;
  border-bottom-color: rgba(0,0,0,0.06);
  padding-top: 12px;
  padding-bottom: 0;
}

/* ── PREMIUM REDESIGN: Apple/Linear aesthetic ── */

/* Board: warmer white with refined dot grid */
.mm-board {
  background-color: #fafaf9 !important;
  background-image: radial-gradient(circle, #c9c9c9 1px, transparent 1px) !important;
  background-size: 28px 28px !important;
}

/* Cards: crisper, minimal shadow stack */
.mm-card {
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.05),
    0 1px 2px rgba(0,0,0,0.04),
    0 4px 12px rgba(0,0,0,0.04) !important;
  border: 1px solid rgba(0,0,0,0.06) !important;
}
.mm-card:hover {
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.07),
    0 4px 16px rgba(0,0,0,0.10),
    0 16px 40px rgba(0,0,0,0.08) !important;
}

/* Icon: very subtle tint, no vivid fill */
.mm-n-schet .mm-ico-wrap     { background: rgba(124,58,237,0.06) !important; }
.mm-n-sravnenie .mm-ico-wrap { background: rgba(22,163,74,0.06)  !important; }
.mm-n-slozhenie .mm-ico-wrap { background: rgba(234,88,12,0.06)  !important; }
.mm-n-vychitanie .mm-ico-wrap{ background: rgba(225,29,72,0.06)  !important; }
.mm-n-geometriya .mm-ico-wrap{ background: rgba(2,132,199,0.06)  !important; }

/* Card titles: Apple primary dark */
.mm-n-schet .mm-card-name,
.mm-n-sravnenie .mm-card-name,
.mm-n-slozhenie .mm-card-name,
.mm-n-vychitanie .mm-card-name,
.mm-n-geometriya .mm-card-name {
  color: #1d1d1f !important;
  font-size: 13px;
  letter-spacing: -0.35px;
}

/* Body text: Apple secondary gray (not colored, not childish) */
.mm-n-schet .mm-card-body p,
.mm-n-sravnenie .mm-card-body p,
.mm-n-slozhenie .mm-card-body p,
.mm-n-vychitanie .mm-card-body p,
.mm-n-geometriya .mm-card-body p {
  color: #6e6e73 !important;
  font-size: 11.5px;
  letter-spacing: -0.1px;
}

/* Thinner accent borders */
.mm-n-schet      { border-top-width: 2px !important; }
.mm-n-slozhenie  { border-top-width: 2px !important; }
.mm-n-vychitanie { border-top-width: 2px !important; }

/* Center pill: Apple-dark premium */
.mm-card-center {
  background: linear-gradient(145deg, #1c1c1e 0%, #2e2e30 50%, #1c1c1e 100%) !important;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.08),
    0 8px 32px rgba(0,0,0,0.30),
    0 2px 6px rgba(0,0,0,0.20) !important;
}

/* Center sub-label: lighter */
.mm-center-sub { color: rgba(255,255,255,0.38) !important; font-size: 10.5px; }
.mm-center-title { letter-spacing: -0.4px; font-size: 14.5px; }

/* Connection lines: half-opacity for premium restraint */
.mm-line { opacity: 0.45; }
.mm-board.active .mm-dot-1 { opacity: 0.55 !important; }
.mm-board.active .mm-dot-2 { opacity: 0.55 !important; }
.mm-board.active .mm-dot-3 { opacity: 0.55 !important; }
.mm-board.active .mm-dot-4 { opacity: 0.55 !important; }
.mm-board.active .mm-dot-5 { opacity: 0.55 !important; }

/* Chevron: more refined */
.mm-chevron {
  font-size: 16px !important;
  opacity: 0.22 !important;
}
.mm-card:hover .mm-chevron {
  opacity: 0.6 !important;
}

/* ── Photo placeholder cards (replaces broken img elements) ── */
.photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px 20px 16px;
  background: linear-gradient(145deg, var(--ph-bg1, #f5f3ff) 0%, var(--ph-bg2, #ede9fe) 100%);
  position: relative;
  box-sizing: border-box;
}
.photo-placeholder::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--ph-accent, #7c3aed);
  opacity: 0.75;
}
.photo-ph-content { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; }
.photo-ph-eyebrow {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ph-accent, #7c3aed);
  font-family: system-ui, -apple-system, sans-serif;
}
.photo-ph-title {
  font-size: 17px;
  font-weight: 700;
  color: #1d1d1f;
  letter-spacing: -0.4px;
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.2;
}
.photo-ph-body {
  font-size: 12px;
  color: #6e6e73;
  line-height: 1.5;
  font-family: system-ui, -apple-system, sans-serif;
}
.photo-ph-label {
  font-size: 10.5px;
  font-weight: 600;
  color: rgba(0,0,0,0.3);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-family: system-ui, -apple-system, sans-serif;
}

/* ═══════════════════════════════════════════════════════════════
   ОБЩАЯ МЕНТАЛЬНАЯ КАРТА — переиспользуемая на страницах тем.
   Базовые .mm-board / .mm-card / .mm-card-* наследуются как есть;
   добавляются обобщённые позиции (.mm-pos-*), цвета (.mm-c-*),
   заголовки секций (.mm-section*) для нескольких карт на странице.
   Координаты карточек и линий совпадают с примером на главной.
   ═══════════════════════════════════════════════════════════════ */

/* Позиции карточек в системе координат 960×540: 2 слева, 3 справа */
.mm-pos-l1 { left: 10px;  top: 100px; --mm-tx:  240px; }
.mm-pos-l2 { left: 10px;  top: auto; bottom: 116px; --mm-tx:  240px; flex-direction: column-reverse; }
.mm-pos-r1 { left: 750px; top: 45px;  --mm-tx: -240px; }
.mm-pos-r2 { left: 750px; top: 228px; --mm-tx: -240px; }
.mm-pos-r3 { left: 750px; top: auto; bottom: 89px;  --mm-tx: -240px; flex-direction: column-reverse; }

/* Цветной акцент: сверху у верхних карточек, снизу — у нижних */
.mm-pos-l1, .mm-pos-r1, .mm-pos-r2 { border-top: 2px solid var(--mm-accent, #d2d2d7) !important; }
.mm-pos-l2, .mm-pos-r3             { border-bottom: 2px solid var(--mm-accent, #d2d2d7) !important; }

/* Нижние карточки раскрываются вверх — разделитель тела как у примера */
.mm-pos-l2 .mm-card-body,
.mm-pos-r3 .mm-card-body {
  border-top: none;
  border-bottom: 1px solid transparent;
  padding-top: 0;
  padding-bottom: 0;
  transition: max-height 0.46s cubic-bezier(0.34,1.56,0.64,1),
              padding 0.3s ease,
              border-color 0.2s ease;
}
.mm-pos-l2:hover .mm-card-body,
.mm-pos-r3:hover .mm-card-body {
  border-top-color: transparent !important;
  border-bottom-color: rgba(0,0,0,0.06);
  padding-top: 12px;
  padding-bottom: 0;
}

/* Цветовые темы веток (пастель × Apple) */
.mm-c-violet { --mm-accent: #c4b5fd; }
.mm-c-violet .mm-ico-wrap { background: rgba(124,58,237,0.07) !important; }
.mm-c-violet .mm-chevron  { color: #7c3aed !important; }

.mm-c-green  { --mm-accent: #6ee7b7; }
.mm-c-green  .mm-ico-wrap { background: rgba(22,163,74,0.07) !important; }
.mm-c-green  .mm-chevron  { color: #16a34a !important; }

.mm-c-amber  { --mm-accent: #fdba74; }
.mm-c-amber  .mm-ico-wrap { background: rgba(234,88,12,0.07) !important; }
.mm-c-amber  .mm-chevron  { color: #ea580c !important; }

.mm-c-rose   { --mm-accent: #fca5a5; }
.mm-c-rose   .mm-ico-wrap { background: rgba(225,29,72,0.07) !important; }
.mm-c-rose   .mm-chevron  { color: #e11d48 !important; }

.mm-c-blue   { --mm-accent: #93c5fd; }
.mm-c-blue   .mm-ico-wrap { background: rgba(2,132,199,0.07) !important; }
.mm-c-blue   .mm-chevron  { color: #0284c7 !important; }

/* Тело веток — серый Apple-текст (как в премиум-варианте примера) */
.mm-card-body p { color: #6e6e73; }

/* Запуск анимации появления для обобщённых позиций (.active на доске) */
.mm-board.active .mm-pos-l1 { animation: mm-branch-in 0.6s cubic-bezier(0.34,1.56,0.64,1) 0.52s both; }
.mm-board.active .mm-pos-r1 { animation: mm-branch-in 0.6s cubic-bezier(0.34,1.56,0.64,1) 0.60s both; }
.mm-board.active .mm-pos-l2 { animation: mm-branch-in 0.6s cubic-bezier(0.34,1.56,0.64,1) 0.68s both; }
.mm-board.active .mm-pos-r2 { animation: mm-branch-in 0.6s cubic-bezier(0.34,1.56,0.64,1) 0.76s both; }
.mm-board.active .mm-pos-r3 { animation: mm-branch-in 0.6s cubic-bezier(0.34,1.56,0.64,1) 0.92s both; }

/* ── Заголовок отдельной карты (страницы с несколькими картами) ── */
.mm-section { margin-bottom: 56px; }
.mm-section:last-of-type { margin-bottom: 0; }
.mm-section-head { display: flex; align-items: center; gap: 14px; margin: 0 4px 20px; }
.mm-section-badge {
  width: 46px; height: 46px; border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  font-size: 25px; background: #f5f5f7; flex-shrink: 0;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.04);
}
.mm-section-title { font-size: 23px; font-weight: 700; letter-spacing: -0.4px; color: var(--text); margin: 0; line-height: 1.15; }
.mm-section-sub   { font-size: 13px; color: var(--text-soft); margin: 3px 0 0; }

/* ── Хлебная крошка-возврат вверху страницы темы ── */
.crumb-back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 500; color: var(--text-soft);
  text-decoration: none; margin-bottom: 30px;
  transition: color .2s;
}
.crumb-back:hover { color: var(--blue); }

/* ── Карточка темы со ссылкой на свою ментальную карту ── */
.topic-card.is-linked::after {
  content: '→';
  position: absolute;
  bottom: 14px; right: 16px;
  font-size: 16px; font-weight: 600; color: var(--blue);
  opacity: 0; transform: translateX(-4px);
  transition: opacity .25s, transform .25s;
}
.topic-card.is-linked:hover::after { opacity: 1; transform: translateX(0); }

/* Тёмная секция (внеурочная): стрелка-указатель в фирменном голубом */
.tile-dark .topic-card.is-linked::after { color: var(--blue-sky); }