/* ============================================================
   CustomA2DP — blocks: flow, modules, panel, req, steps, faq,
   download, donate, note, footer, reveal, responsive
   ============================================================ */

/* ---------- flow ---------- */
.flow {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow-x: auto;
}
.flow__row {
  display: flex;
  align-items: stretch;
  gap: 10px;
  min-width: 800px;
}

.flow__node {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 18px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .022);
  text-align: center;
}
.flow__node--hero {
  border-color: rgba(59, 130, 246, .45);
  background: linear-gradient(180deg, rgba(59, 130, 246, .16), rgba(139, 92, 246, .06));
}
.flow__node--end { border-color: rgba(52, 211, 153, .35); }

.flow__kicker {
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.flow__node b { font-size: .98rem; }
.flow__node small { font-size: .76rem; color: var(--muted); line-height: 1.4; }

.flow__arrow {
  align-self: center;
  flex: 0 0 22px;
  height: 2px;
  background: linear-gradient(90deg, var(--a2), var(--a3));
  opacity: .55;
  position: relative;
}
.flow__arrow::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  border: 4px solid transparent;
  border-left-color: var(--a3);
}

/* ---------- modules ---------- */
.modules {
  margin-top: 22px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .018);
}
.modules__title { font-size: 1.02rem; margin-bottom: 16px; }
.modules__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 10px 26px;
}
.modules__list li {
  position: relative;
  padding-left: 20px;
  font-size: .92rem;
  color: var(--text-soft);
}
.modules__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--grad);
}
.modules__list b { color: var(--text); font-family: var(--mono); font-size: .86rem; }

/* ---------- split + panel (GUI) ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}
.split__copy .section__title { margin-bottom: 4px; }

.ticks { display: grid; gap: 9px; margin-top: 22px; }
.ticks li {
  position: relative;
  padding-left: 27px;
  font-size: .96rem;
  color: var(--text-soft);
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: rgba(34, 211, 238, .16);
  border: 1px solid rgba(34, 211, 238, .5);
}
.ticks li::after {
  content: "";
  position: absolute;
  left: 4.6px;
  top: 10.5px;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--a1);
  transform: rotate(45deg);
}
.ticks--good li::before { background: rgba(52, 211, 153, .14); border-color: rgba(52, 211, 153, .5); }
.ticks--good li::after  { background: var(--ok); }
.ticks--bad li::before  { background: rgba(251, 113, 133, .13); border-color: rgba(251, 113, 133, .45); }
.ticks--bad li::after   { background: var(--bad); transform: rotate(45deg) scale(.8); }

.panel {
  border: 1px solid var(--border-str);
  border-radius: var(--radius-lg);
  background: rgba(9, 13, 24, .82);
  box-shadow: var(--shadow-glow);
  overflow: hidden;
  font-size: .9rem;
}
.panel__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, .03);
}
.panel__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .18);
}
.panel__title { margin-left: 8px; font-size: .8rem; color: var(--muted); }

.panel__body { padding: 18px; }
.panel__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, .08);
  color: var(--text-soft);
  font-size: .88rem;
}
.panel__row b { color: var(--text); font-weight: 600; }

.panel__eq {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 96px;
  margin: 20px 0 18px;
  padding: 0 4px 6px;
  border-bottom: 1px solid var(--border);
}
.panel__slider {
  position: relative;
  flex: 1;
  height: var(--v, 2%);
  min-height: 8px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--a1), var(--a3));
  box-shadow: 0 0 14px -2px rgba(59, 130, 246, .6);
}
.panel__slider span {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: .62rem;
  color: var(--muted);
}

.panel__actions { display: flex; gap: 10px; }
.panel__btn {
  flex: 1;
  padding: 10px;
  border-radius: 10px;
  text-align: center;
  font-size: .85rem;
  font-weight: 600;
}
.panel__btn--ghost { border: 1px solid var(--border-str); color: var(--text-soft); }
.panel__btn--solid { background: var(--grad); color: #04070F; }

/* ---------- requirements ---------- */
.req {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(272px, 1fr));
  gap: 16px;
}
.req__card {
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
}
.req__card h3 { font-size: 1.05rem; margin-bottom: 4px; }
.req__card--warn {
  border-color: rgba(251, 191, 36, .28);
  background: linear-gradient(180deg, rgba(251, 191, 36, .07), transparent);
}

/* ---------- steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(212px, 1fr));
  gap: 16px;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 26px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, .04), rgba(255, 255, 255, .01));
}
.step__num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 14px;
  border-radius: 10px;
  background: var(--grad);
  color: #04070F;
  font-weight: 700;
  font-size: .95rem;
  box-shadow: 0 10px 26px -12px rgba(59, 130, 246, .9);
}
.step h3 { font-size: 1rem; margin-bottom: 8px; }
.step p { font-size: .89rem; color: var(--text-soft); }

/* ---------- faq ---------- */
.faq { display: grid; gap: 10px; }
.faq__item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  transition: border-color .25s, background .25s;
}
.faq__item[open] { border-color: rgba(34, 211, 238, .4); background: var(--surface-2); }

.faq__item summary {
  position: relative;
  padding: 17px 46px 17px 20px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  list-style: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--a1);
  border-bottom: 2px solid var(--a1);
  transform: translateY(-70%) rotate(45deg);
  transition: transform .25s var(--ease);
}
.faq__item[open] summary::after { transform: translateY(-30%) rotate(-135deg); }

.faq__body { padding: 0 20px 19px; }
.faq__body p { font-size: .95rem; color: var(--text-soft); }

/* ---------- download ---------- */
.dl {
  position: relative;
  padding: clamp(28px, 5vw, 52px);
  border: 1px solid rgba(59, 130, 246, .3);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 130% at 12% 0%, rgba(59, 130, 246, .2), transparent 58%),
    linear-gradient(180deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .014));
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}
.dl__glow {
  position: absolute;
  right: -12%;
  bottom: -55%;
  width: 55%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(139, 92, 246, .3), transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}
.dl__main { position: relative; max-width: 760px; }
.dl__title { font-size: clamp(1.5rem, 3vw, 2.15rem); letter-spacing: -.03em; }
.dl__title span {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.dl__lead { margin-top: 14px; color: var(--text-soft); }
.dl__actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 30px; }

.dl__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px 22px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.dl__meta dt {
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 3px;
}
.dl__meta dd { font-size: .88rem; color: var(--text); }
.dl__meta dd.mono { font-size: .74rem; color: var(--text-soft); }

/* ---------- donate ---------- */
.donate {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.donate__split {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
  font-size: .93rem;
  color: var(--text-soft);
}
.donate__bar {
  position: relative;
  display: block;
  flex: 0 0 132px;
  height: 9px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .1);
  overflow: hidden;
}
.donate__bar i {
  position: absolute;
  inset: 0 50% 0 0;
  background: linear-gradient(90deg, var(--a2), var(--a1));
  box-shadow: 0 0 16px -2px rgba(34, 211, 238, .8);
}

.donate__box {
  padding: 24px;
  border: 1px solid var(--border-str);
  border-radius: var(--radius);
  background: rgba(8, 12, 22, .7);
}
.donate__list { display: grid; gap: 10px; }
.donate__list .is-empty {
  font-size: .9rem;
  color: var(--muted);
  text-align: center;
  padding: 16px 0;
}

.donate__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 15px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, .03);
  transition: transform .2s var(--ease), border-color .2s, background .2s;
}
.donate__link:hover {
  transform: translateY(-2px);
  border-color: rgba(34, 211, 238, .5);
  background: rgba(255, 255, 255, .06);
}
.donate__link b { display: block; font-size: .95rem; }
.donate__link small { color: var(--muted); font-size: .78rem; }
.donate__link .arrow { margin-left: auto; color: var(--muted); }

.donate__note {
  margin-top: 18px;
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.55;
}

/* ---------- note ---------- */
.note {
  padding: clamp(24px, 4vw, 38px);
  border: 1px solid var(--border);
  border-left: 3px solid var(--a2);
  border-radius: var(--radius-lg);
  background: var(--surface);
}
.note__title { font-size: 1.25rem; margin-bottom: 6px; }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, .012);
  padding: 40px 0;
  margin-top: 20px;
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 22px 34px;
}
.footer__brand { display: flex; align-items: center; gap: 11px; }
.footer__brand b { display: block; font-size: .98rem; }
.footer__brand span { font-size: .8rem; color: var(--muted); }

.footer__nav { display: flex; flex-wrap: wrap; gap: 4px 18px; margin-left: auto; }
.footer__nav a { font-size: .87rem; color: var(--muted); transition: color .2s; }
.footer__nav a:hover { color: var(--text); }

.footer__copy {
  flex: 1 0 100%;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: .8rem;
  color: var(--muted);
}

/* ---------- download counter ---------- */
.dl__counter {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: -12px 0 28px;
  padding: 8px 16px 8px 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, .03);
  font-size: .88rem;
  color: var(--text-soft);
}
.dl__counter[hidden] { display: none; }
.dl__counter svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: var(--a1);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.dl__counter b {
  color: var(--text);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ---------- language switcher ---------- */
.lang {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, .03);
  flex-shrink: 0;
}

.lang__opt {
  padding: 5px 11px;
  border-radius: 7px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--muted);
  white-space: nowrap;
  transition: color .2s, background .2s, box-shadow .2s;
}
.lang__opt:hover { color: var(--text); }

.lang__opt.is-active {
  color: #04070F;
  background: var(--grad);
  box-shadow: 0 4px 14px -6px rgba(59, 130, 246, .9);
}

.lang--mobile {
  margin-top: 12px;
  width: 100%;
  justify-content: center;
}
.lang--mobile .lang__opt { flex: 1; text-align: center; padding: 10px; }

.lang--footer { margin-left: auto; }

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .nav { display: none; }
  .header__cta { display: none; }
  .burger { display: block; }
  .mobile-nav { display: flex; }
  .mobile-nav[hidden] { display: none; }

  .hero__inner,
  .split,
  .donate { grid-template-columns: minmax(0, 1fr); }
  .hero__visual { order: -1; }
  .stats__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat:nth-child(odd) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--border); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .compare { grid-template-columns: minmax(0, 1fr); }
  .footer__nav { margin-left: 0; }
  .dl__actions .btn, .hero__actions .btn { flex: 1 1 100%; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}