:root {
  --miku: #39c5bb;        /* мятный */
  --miku-dark: #0c7f79;   /* тёмный мятный */
  --accent: #ff66a8;      /* розовый акцент */
  --ink: #0d1b1e;         /* почти чёрный */
  --bg: #f3fffd;          /* очень светлый мятный */
  --card: #ffffff;
  --border: rgba(12,127,121,0.18);
  --ring: rgba(57,197,187,0.35);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, Helvetica, Arial, "Noto Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 800px at -10% -20%, rgba(57,197,187,0.10), transparent 60%),
    radial-gradient(900px 600px at 110% 0%, rgba(255,102,168,0.10), transparent 60%),
    repeating-linear-gradient(45deg, rgba(57,197,187,0.03) 0 12px, transparent 12px 24px),
    var(--bg);
  min-height: 100%;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem;
}

/* Страницы‑статьи: не центрируем по вертикали, чтобы всё было прокручиваемо */
body.page-article {
  display: block;
}
.card {
  width: min(860px, 94vw);
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem 1.25rem 1.25rem;
  box-shadow: 0 6px 26px rgba(0,0,0,0.05);
  position: relative;
  overflow: hidden;
}
.ribbon {
  position: absolute; inset: 0 auto auto 0;
  width: 140px; height: 140px;
  background: radial-gradient(60px 60px at 20% 20%, rgba(57,197,187,0.25), transparent 60%);
  filter: blur(6px);
  pointer-events: none;
}
h1 {
  margin: 0 0 0.25rem;
  font-size: clamp(1.9rem, 4.5vw, 2.6rem);
  line-height: 1.15;
  background: linear-gradient(88deg, var(--miku) 10%, var(--accent) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tag {
  display: inline-block; margin-bottom: 0.5rem;
  padding: 0.25rem 0.6rem; border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--miku-dark);
  background: rgba(57,197,187,0.10);
  font-size: 0.85rem;
}
.tabs { margin-top: 1rem; }
.tabs [type=radio] { position: absolute; left: -9999px; }
.tab-labels {
  display: flex; gap: 0.5rem; flex-wrap: wrap;
  background: linear-gradient(180deg, rgba(57,197,187,0.06), rgba(57,197,187,0.0));
  padding: 0.5rem; border-radius: 12px; border: 1px solid var(--border);
}
.audio-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.audio-title {
  font-weight: 550;
  margin-bottom: 0.5rem;
}
#track-select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  margin-bottom: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: 0.95rem;
  transition: all 160ms ease;
}
#track-select:hover {
  box-shadow: 0 0 0 4px var(--ring);
}
#track-select:focus {
  outline: none;
  border-color: var(--miku);
  box-shadow: 0 0 0 4px var(--ring);
}
#audio-player {
  width: 100%;
  height: 3rem;
  margin-top: 0.2rem;
  border-radius: 8px;
  background: linear-gradient(145deg, #f8fffd, #f3fffd);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
#audio-player::-webkit-media-controls-panel {
  background-color: rgba(57,197,187,0.1);
  border-radius: 8px;
}
#audio-player::-webkit-media-controls-play-button {
  background-color: var(--miku);
  border-radius: 50%;
  color: white;
}
#audio-player::-webkit-media-controls-current-time-display,
#audio-player::-webkit-media-controls-time-remaining-display {
  color: var(--miku-dark);
}
#audio-player::-webkit-media-controls-timeline {

  border-radius: 4px;
  height: 6px;
}
#audio-player::-webkit-media-controls-volume-slider {
  background-color: rgba(57,197,187,0.2);
  border-radius: 4px;
  padding: 2px;
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}
/* Firefox стили */
#audio-player::-moz-range-track {
  background-color: rgba(57,197,187,0.2);
  border-radius: 4px;
  height: 6px;
}
#audio-player::-moz-range-thumb {
  background-color: var(--miku);
  border: 2px solid white;
  border-radius: 50%;
}
.tab-labels label {
  padding: 0.45rem 0.8rem; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border);
  color: var(--miku-dark); background: #f8fffe; font-weight: 560;
  transition: all 160ms ease;
}
.tab-labels label:hover { box-shadow: 0 0 0 4px var(--ring); }
.panels { margin-top: 0.9rem; }
.panel { display: none; border: 1px solid var(--border); border-radius: 12px; padding: 1rem; background: #fff; }
#tab-overview:checked ~ .tab-labels label[for=tab-overview],
#tab-links:checked    ~ .tab-labels label[for=tab-links],
#tab-audio:checked    ~ .tab-labels label[for=tab-audio],
#tab-crypto:checked   ~ .tab-labels label[for=tab-crypto] {
  background: linear-gradient(180deg, #fff, #f7fffd);
  border-color: rgba(12,127,121,0.35);
  color: var(--ink);
  box-shadow: 0 0 0 4px var(--ring);
}
#tab-overview:checked ~ .panels #panel-overview,
#tab-links:checked    ~ .panels #panel-links,
#tab-audio:checked    ~ .panels #panel-audio,
#tab-crypto:checked   ~ .panels #panel-crypto { display: block; }

ul.songs { list-style: none; padding: 0; margin: 0; }
ul.songs li { padding: 0.35rem 0.25rem; display: flex; gap: 0.6rem; align-items: center; }
.note { width: 18px; height: 18px; border-radius: 4px; background: var(--miku); box-shadow: 0 2px 0 var(--miku-dark) inset; }

/* Стили для криптографического раздела */
.crypto-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.crypto-item {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  transition: all 160ms ease;
  position: relative;
  overflow: hidden;
}
.crypto-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--miku);
}
.crypto-item:hover {
  box-shadow: 0 0 0 4px var(--ring);
  transform: translateY(-2px);
}
.crypto-item h4 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--miku-dark);
}
.crypto-item p {
  margin: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--ink);
}
.crypto-item a {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.3rem 0.7rem;
  background: var(--miku);
  color: #fff;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 550;
  text-decoration: none;
  transition: all 160ms ease;
}
.crypto-item a:hover {
  background: var(--miku-dark);
}

/* Стили для под-вкладок криптографических статей */
.subtabs {
  margin-top: 2rem;
  position: relative;
  border-radius: 12px;
  background: linear-gradient(to bottom, #f8fffe, #fff);
  padding: 1rem;
  border: 1px solid var(--border);
}
.subtabs [type=radio] {
  position: absolute;
  left: -9999px;
}
.subtab-labels {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.subtab-labels label {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #f8fffe;
  color: var(--miku-dark);
  font-size: 0.9rem;
  font-weight: 550;
  transition: all 160ms ease;
  position: relative;
}
.subtab-labels label::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: linear-gradient(60deg, transparent, rgba(57,197,187,0.05), transparent);
  opacity: 0;
  transition: opacity 160ms ease;
}
.subtab-labels label:hover {
  box-shadow: 0 0 0 3px var(--ring);
  transform: translateY(-1px);
}
.subtab-labels label:hover::before {
  opacity: 1;
}
.subpanels {
  position: relative;
}
.subpanel {
  display: none;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem;
  background: linear-gradient(to bottom, #fff, #fcfffe);
}
.subpanel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 12px;
  background: radial-gradient(80px 80px at 10% 10%, rgba(57,197,187,0.04), transparent 70%);
  pointer-events: none;
}
.subpanel h3 {
  margin: 0 0 1rem;
  font-size: 1.3rem;
  color: var(--miku-dark);
  position: relative;
}
.subpanel p {
  margin: 0.5rem 0;
  line-height: 1.6;
  color: var(--ink);
}
#sub-basics:checked    ~ .subtab-labels label[for=sub-basics],
#sub-symmetric:checked ~ .subtab-labels label[for=sub-symmetric],
#sub-asymmetric:checked~ .subtab-labels label[for=sub-asymmetric],
#sub-hash:checked      ~ .subtab-labels label[for=sub-hash],
#sub-blockchain:checked~ .subtab-labels label[for=sub-blockchain] {
  background: linear-gradient(180deg, #fff, #f7fffd);
  border-color: var(--miku);
  color: var(--ink);
  box-shadow: 0 0 0 3px var(--ring);
}
#sub-basics:checked    ~ .subtab-labels label[for=sub-basics]::after,
#sub-symmetric:checked ~ .subtab-labels label[for=sub-symmetric]::after,
#sub-asymmetric:checked~ .subtab-labels label[for=sub-asymmetric]::after,
#sub-hash:checked      ~ .subtab-labels label[for=sub-hash]::after,
#sub-blockchain:checked~ .subtab-labels label[for=sub-blockchain]::after {
  content: "";
  position: absolute;
  bottom: -0.5rem;
  left: 50%;
  width: 20%;
  height: 3px;
  background: var(--miku);
  border-radius: 3px;
  transform: translateX(-50%);
}
#sub-basics:checked    ~ .subpanels #panel-sub-basics,
#sub-symmetric:checked ~ .subpanels #panel-sub-symmetric,
#sub-asymmetric:checked~ .subpanels #panel-sub-asymmetric,
#sub-hash:checked      ~ .subpanels #panel-sub-hash,
#sub-blockchain:checked~ .subpanels #panel-sub-blockchain {
  display: block;
  animation: fadeIn 200ms ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}
.crypto-link {
  display: inline-block;
  margin-top: 0.8rem;
  padding: 0.4rem 0.9rem;
  background: var(--miku);
  color: #fff;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 550;
  text-decoration: none;
  transition: all 160ms ease;
  border: 1px solid var(--miku);
  position: relative;
}
.crypto-link::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 6px;
  background: linear-gradient(to right, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 300ms ease;
}
.crypto-link:hover {
  background: var(--miku-dark);
  border-color: var(--miku-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(57,197,187,0.3);
}
.crypto-link:hover::before {
  transform: translateX(100%);
}

/* Ряд из нескольких crypto-link, чтобы не прыгали при наведении */
.crypto-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.8rem;
}
.crypto-link-row .crypto-link {
  margin-top: 0;
}

/* Страницы статей (crypto) */
.article {
  width: min(860px, 94vw);
}
.article-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}
.article-title {
  flex: 1;
}
.article h1 {
  margin: 0 0 0.75rem;
}
.article .meta {
  opacity: 0.7;
  font-size: 0.9rem;
  margin-top: 0.3rem;
}
.article-body {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.article-section {
  position: relative;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(to bottom, #ffffff, #f8fffe);
  padding: 0.9rem 1rem;
}

.article-section h2 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
  color: var(--miku-dark);
}

.article-section h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--miku-dark);
}

.article-section p {
  margin: 0.35rem 0;
}

.article-body code {
  background: rgba(57,197,187,0.08);
  padding: 0.05rem 0.25rem;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9em;
}

.article-steps {
  margin: 0.4rem 0 0.2rem;
  padding-left: 1.25rem;
}

.article-steps li {
  margin: 0.2rem 0;
}

.article-section--columns {
  display: grid;
  grid-template-columns: minmax(0, 2.2fr) minmax(0, 1.4fr);
  gap: 1rem;
  align-items: flex-start;
}

.article-aside {
  padding: 0.75rem 0.8rem;
  border-radius: 10px;
  border: 1px dashed var(--border);
  background: radial-gradient(80px 80px at 5% 0%, rgba(57,197,187,0.06), transparent 70%);
  font-size: 0.9rem;
}

.article-section--note {
  border-style: dashed;
  background: linear-gradient(to right, #fffefc, #fcfffe);
}

@media (max-width: 720px) {
  .article-section--columns {
    grid-template-columns: minmax(0, 1fr);
  }
}
.back,
.button-nav {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  margin: 0;
  color: var(--miku-dark);
  background: linear-gradient(to bottom, #f8fffe, #f3fffd);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 160ms ease;
  box-shadow: 0 2px 6px rgba(57,197,187,0.1);
  position: relative;
}
.back:hover,
.button-nav:hover {
  color: var(--miku);
  border-color: var(--miku);
  box-shadow: 0 0 0 3px var(--ring);
  transform: translateY(-1px);
}

/* Мини‑калькулятор для шифра Эль‑Гамаля */
.crypto-mini {
  margin-top: 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: linear-gradient(to bottom, #ffffff, #f7fffd);
  padding: 0.5rem 0.75rem 0.75rem;
}
.crypto-mini > summary {
  list-style: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 550;
  color: var(--miku-dark);
}
.crypto-mini > summary::-webkit-details-marker {
  display: none;
}
.crypto-mini > summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 0.35rem;
  transform-origin: center;
  transition: transform 160ms ease;
}
.crypto-mini[open] > summary::before {
  transform: rotate(90deg);
}
.crypto-mini-body {
  margin-top: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #ffffff;
  padding: 0.6rem 0.7rem;
  font-size: 0.85rem;
}

.crypto-mini-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  margin-top: 0.6rem;
}
.crypto-mini-section {
  border-radius: 10px;
  border: 1px solid var(--border);
  background: linear-gradient(to bottom, #ffffff, #f8fffe);
  padding: 0.6rem 0.7rem 0.7rem;
}
.crypto-mini-section h3 {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
  color: var(--miku-dark);
}

.crypto-mini-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}
.crypto-mini-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.crypto-mini-row label {
  font-weight: 500;
}
.crypto-mini-row input {
  padding: 0.35rem 0.45rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  font: inherit;
}
.crypto-mini-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.45rem;
}
.crypto-mini-actions button {
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--miku);
  background: var(--miku);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 550;
  cursor: pointer;
  transition: all 150ms ease;
}
.crypto-mini-actions button:hover {
  background: var(--miku-dark);
  border-color: var(--miku-dark);
}
.crypto-mini-actions .crypto-mini-secondary {
  background: #ffffff;
  color: var(--miku-dark);
  border-color: var(--miku);
  font-size: 0.78rem;
  padding-inline: 0.6rem;
}
.crypto-mini-actions .crypto-mini-secondary:hover {
  background: #f8fffe;
  border-color: var(--miku-dark);
}
.crypto-mini-output {
  margin-top: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #f8fffe;
  padding: 0.45rem 0.55rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Мини‑интерактив для визуализации шагов (шаблон) */
.crypto-flow {
  margin-top: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.crypto-flow-controls {
  align-self: stretch;
}

.crypto-flow-diagram {
  align-self: stretch;
}

/* Вертикальный трек с шагами по ширине статьи */
.crypto-flow-track {
  position: relative;
  min-height: 440px; /* оптимальная высота для связной анимации */
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(to bottom, #ffffff, #f8fffe);
  padding: 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: background 300ms ease;
}

/* Фазы: шифрование и расшифрование */
.crypto-flow-track--enc {
  background: linear-gradient(to bottom, #ffffff, #f8fffe);
}

.crypto-flow-track--dec {
  background: linear-gradient(to bottom, #fff7fb, #fefbff);
}

/* Базовая вертикальная ось (очень лёгкая) */
.crypto-flow-line {
  position: absolute;
  top: 1rem;
  bottom: 1rem;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, rgba(57,197,187,0.18), rgba(255,102,168,0.18));
  opacity: 0.5;
}

/* SVG‑нить между точками */
.crypto-flow-path {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Путь делаем бледным, чтобы не перетягивал внимание */
.crypto-flow-path path {
  opacity: 0.3;
}

.crypto-flow-step {
  position: relative;
  font-size: 0.8rem;
  z-index: 1;
  min-height: 38px;
  padding: 0.2rem 0.25rem;
}

/* Мини‑окошко с числами для шага (на противоположной стороне от текста) */
.crypto-flow-values {
  position: absolute;
  top: 50%;
  max-width: 36%;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  background: rgba(57,197,187,0.08);
  border: 1px solid rgba(57,197,187,0.3);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.75rem;
  opacity: 0;
  transform: translateY(-50%) translateX(4px);
  transition: opacity 220ms ease 140ms, transform 220ms ease 140ms;
}

.crypto-flow-values.is-visible {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

/* Лёгкая "рулетка" для генерации чисел */
.crypto-flow-values.is-rolling {
  animation: cryptoFlowValuePulse 260ms ease-in-out 0s 2;
}

@keyframes cryptoFlowValuePulse {
  0% { transform: translateY(-50%) scale(1); }
  50% { transform: translateY(-52%) scale(1.04); }
  100% { transform: translateY(-50%) scale(1); }
}

/* Левые шаги: окно с числами справа от оси */
.crypto-flow-step[data-flow-step="0"] .crypto-flow-values,
.crypto-flow-step[data-flow-step="2"] .crypto-flow-values {
  left: 50%;
}

/* Правые шаги: окно с числами слева от оси */
.crypto-flow-step[data-flow-step="1"] .crypto-flow-values,
.crypto-flow-step[data-flow-step="3"] .crypto-flow-values {
  right: 50%;
  transform: translateY(-50%) translateX(-4px);
}

/* Шаги по очереди слева/справа от линии (на краях карточки) */
.crypto-flow-step[data-flow-step="0"],
.crypto-flow-step[data-flow-step="2"] {
  padding-right: 70%;
  text-align: right;
}

.crypto-flow-step[data-flow-step="1"],
.crypto-flow-step[data-flow-step="3"] {
  padding-left: 70%;
  text-align: left;
}

.crypto-flow-step-title {
  display: block;
  font-weight: 600;
}

/* Общий мини‑блок для заголовка и описания шага */
.crypto-flow-step-box {
  display: inline-block;
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  background: rgba(57,197,187,0.04);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 220ms ease, transform 220ms ease, background 220ms ease, box-shadow 220ms ease, border 220ms ease;
  border: 1px solid transparent;
}

.crypto-flow-step.is-active .crypto-flow-step-box {
  opacity: 1;
  transform: translateY(0);
  background: rgba(57,197,187,0.08);
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
  border: 1px solid rgba(57,197,187,0.25);
}

/* Поля ввода с ошибкой во втором калькуляторе */
.crypto-flow-input-invalid {
  border-color: #d32f2f;
  background: rgba(211,47,47,0.06);
}

.crypto-flow-step-meta {
  display: block;
  margin-top: 0.15rem;
  padding: 0;
  border-radius: 0;
  background: transparent;
  opacity: 0.85;
  font-size: 0.78rem;
}

.crypto-flow-step::before {
  content: "";
  position: absolute;
  top: 50%;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid rgba(57,197,187,0.4);
  box-shadow: 0 0 0 2px rgba(57,197,187,0.12);
  transform: translateY(-50%);
}

/* Точка для левых блоков — после текста, ближе к центру */
.crypto-flow-step[data-flow-step="0"]::before,
.crypto-flow-step[data-flow-step="2"]::before {
  right: 50%;
  transform: translate(50%, -50%);
}

/* Точка для правых блоков — перед текстом, ближе к центру */
.crypto-flow-step[data-flow-step="1"]::before,
.crypto-flow-step[data-flow-step="3"]::before {
  left: 50%;
  transform: translate(-50%, -50%);
}

.crypto-flow-step.is-active::before {
  border-color: var(--miku);
  background: var(--miku);
}

.crypto-flow-step.is-active .crypto-flow-step-title {
  color: var(--miku-dark);
}

.crypto-flow-dot {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, var(--miku));
  box-shadow: 0 0 0 3px rgba(57,197,187,0.35);
  transition: left 420ms ease, top 420ms ease;
}

@media (max-width: 720px) {
  .crypto-flow-track {
    min-height: 220px;
    padding: 0.8rem 1rem 1rem;
  }
}

/* Маленькие пиктограммы для шагов */
.crypto-flow-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  margin-inline: 0.25rem;
  background: rgba(57,197,187,0.12);
  color: var(--miku-dark);
  border: 1px solid rgba(57,197,187,0.35);
}

.crypto-flow-icon::before {
  content: '';
}

.crypto-flow-icon--params::before {
  content: 'p';
}

.crypto-flow-icon--k::before {
  content: 'k';
}

.crypto-flow-icon--enc::before {
  content: 'E';
}

.crypto-flow-icon--send::before {
  content: '✉';
}

.crypto-flow-icon--recv::before {
  content: '↧';
}

.crypto-flow-icon--dec::before {
  content: 'D';
}

.crypto-flow-icon--plain::before {
  content: 'm';
}

/* Индикатор прогресса шагов */
.crypto-flow-progress {
  font-size: 0.78rem;
  opacity: 0.7;
  margin-top: 0.25rem;
  text-align: left;
}

/* Чип с названием текущей фазы */
.crypto-flow-phase-chip {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 550;
  margin-bottom: 0.5rem;
  border: 1px solid var(--border);
  background: rgba(57,197,187,0.08);
  color: var(--miku-dark);
  transition: all 300ms ease;
}

.crypto-flow-phase-chip--dec {
  background: rgba(255,102,168,0.08);
  border-color: rgba(255,102,168,0.25);
  color: #c2185b;
}

footer {
  margin-top: 1rem;
  font-size: 0.95rem;
  opacity: 0.75;
}
footer .footer-audio {
  display: none;
}

/* Общие стили для иллюстраций Мику в статьях и на главной */
.image-container {
  margin: 1.4rem 0;
  text-align: center;
}
.miku-image {
  width: min(60%, 400px);
  max-width: 100%;
  display: block;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(57,197,187,0.2);
  border: 1px solid var(--border);
  object-fit: contain;
}
.image-caption {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--miku-dark);
  opacity: 0.8;
}
#tab-audio:checked ~ footer .footer-default {
  display: none;
}
#tab-audio:checked ~ footer .footer-audio {
  display: inline;
}
#loading-status {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--miku-dark);
  text-align: center;
  background: rgba(57,197,187,0.1);
  padding: 0.4rem;
  border-radius: 999px;
  font-weight: 560;
  border: 1px solid var(--border);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

/* Адаптивность для телефонов и небольших экранов */
@media (max-width: 600px) {
  body {
    padding: 1rem;
    justify-content: center;
    align-items: flex-start;
  }
  .card {
    width: 100%;
    padding: 1rem 0.75rem 1rem;
    border-radius: 12px;
  }
  /* Вкладки: вместо горизонтального скролла — аккуратные "пузырьки" в 1–2 строки */
  .tab-labels {
    gap: 0.35rem;
    justify-content: flex-start;
  }
  .tab-labels label {
    flex: 1 1 calc(50% - 0.35rem);
    white-space: normal;
    font-size: 0.9rem;
    padding-inline: 0.7rem;
    text-align: center;
  }
  .subtabs {
    padding: 0.75rem;
    margin-top: 1rem;
  }
  .subtab-labels {
    gap: 0.35rem;
    justify-content: flex-start;
  }
  .subtab-labels label {
    flex: 1 1 calc(50% - 0.35rem);
    white-space: normal;
    font-size: 0.85rem;
  }
  .subpanel {
    padding: 0.9rem;
  }
  .article-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
  .article-header .button-nav {
    align-self: flex-start;
  }
  footer {
    font-size: 0.85rem;
    text-align: center;
  }
}