/* ══════════════════════════════════════════
   SLIDER STAGE
══════════════════════════════════════════ */
.slider-stage {
  position: relative;
  width: 100%;
  height: var(--stage-h);
  overflow: hidden;
  margin-top: 52px;
}


.slider-stage::before {
  top: 0;
  background: linear-gradient(to bottom, var(--bg) 0%, transparent 100%);
}
.slider-stage::after {
  bottom: 0;
  background: linear-gradient(to top, var(--bg) 0%, transparent 100%);
}

/* ══════════════════════════════════════════
   COLUMNS WRAPPER
══════════════════════════════════════════ */
.cols-wrap {
  display: flex;
  gap: var(--gap);
  height: 100%;
  padding: 0 20px;
}

/* ══════════════════════════════════════════
   SINGLE COLUMN
══════════════════════════════════════════ */
.col-track-wrap {
  flex: 1 1 0;
  min-width: 0;
  overflow: hidden;
  height: 100%;
}

.col-track {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  will-change: transform;
}

/* Column 1 – UP */
.col-track-wrap:nth-child(1) .col-track {
  animation:   scrollDown 34s linear infinite;
}
/* Column 2 – DOWN */
.col-track-wrap:nth-child(2) .col-track {
  animation: scrollUp 34s linear infinite;
}
/* Column 3 – UP (different speed) */
.col-track-wrap:nth-child(3) .col-track {
  animation: scrollDown   30s linear infinite;
}

@keyframes scrollUp {
  from { transform: translateY(0); }
  to   { transform: translateY(-50%); }
}
@keyframes scrollDown {
  from { transform: translateY(-50%); }
  to   { transform: translateY(0); }
}

/* ══════════════════════════════════════════
   CARD
══════════════════════════════════════════ */
.screen-card {
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  flex-shrink: 0;
}

.screen-card img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  vertical-align: top;
}

/* ══════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
══════════════════════════════════════════ */

/* ── Large desktop ≥ 1400px ── */
@media (min-width: 1400px) {
  :root { --stage-h: 700px; --gap: 22px; }
}

/* ── Desktop 1200–1399px ── */
@media (max-width: 1399px) and (min-width: 1200px) {
  :root { --stage-h: 640px; --gap: 20px; }
}

/* ── Laptop 992–1199px ── */
@media (max-width: 1199px) and (min-width: 992px) {
  :root { --stage-h: 580px; --gap: 16px; }
}

/* ── Tablet landscape 768–991px — still 3 cols ── */
@media (max-width: 991px) and (min-width: 768px) {
  :root { --stage-h: 500px; --gap: 14px; }
  .slider-stage { margin-top: 40px; }
  .slider-stage::before,
  .slider-stage::after { height: 90px; }
  .cols-wrap { padding: 0 14px; }
}

/* ── Tablet portrait 576–767px — still 3 cols ── */
@media (max-width: 767px) and (min-width: 576px) {
  :root { --stage-h: 420px; --gap: 12px; }
  .slider-stage { margin-top: 34px; }
  .slider-stage::before,
  .slider-stage::after { height: 80px; }
  .cols-wrap { padding: 0 12px; }
  .screen-card { border-radius: 14px; }
}

/* ── Mobile large 400–575px — 2 cols ── */
@media (max-width: 575px) {
  :root { --stage-h: 380px; --gap: 35px; }
  .slider-stage { margin-top: 28px; }
  .slider-stage::before,
  .slider-stage::after { height: 70px; }
  .cols-wrap { padding: 0 10px; }
  .screen-card { border-radius: 12px; }

  /* Hide 3rd column → 2-column layout */
  .col-track-wrap:nth-child(3) { display: none; }
}

/* ── Mobile medium 360–399px ── */
@media (max-width: 399px) {
  :root { --stage-h: 320px; --gap: 2px; }
  .cols-wrap { padding: 0 8px; }
  .screen-card { border-radius: 10px; }
  .slider-stage::before,
  .slider-stage::after { height: 60px; }
}

/* ── Mobile small < 360px ── */
@media (max-width: 359px) {
  :root { --stage-h: 280px; --gap: 7px; }
  .cols-wrap { padding: 0 6px; }
}