:root {
  color-scheme: dark;

  /* Qtum blue palette */
  --qtum-blue: #0645f7;
  --qtum-blue-light: #3b7bff;
  --qtum-blue-softer: #a9c4ff;
  --qtum-blue-bg-soft: rgba(6, 69, 247, 0.18);
  --qtum-blue-border-soft: rgba(6, 69, 247, 0.55);

  /* Warning colors */
  --warning-amber-bg-soft: rgba(245, 158, 11, 0.1);
  --warning-amber-border-soft: rgba(245, 158, 11, 0.45);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background:
    radial-gradient(circle at top, rgba(6, 69, 247, 0.28) 0, #020617 40%, #000 100%);
  color: #f9fafb;
}

/* Main two-column card (text left, screenshots right) */
.card {
  width: 100%;
  max-width: 850px;
  min-height: 485px;
  background: rgba(9, 15, 30, 0.96);
  border-radius: 24px;
  padding: 30px 26px 22px;
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.35);
  display: flex;
  gap: 24px;
}

/* Left section (installer text) grows, right (screenshots) is fixed */
.card > section:first-child {
  flex: 1 1 0;
}

/* Badge + header */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--qtum-blue-softer);
  background: rgba(6, 69, 247, 0.2);
  border-radius: 999px;
  padding: 6px 13px;
}

.icon {
  margin-top: 20px;
}

.icon img {
  width: 100px;
  height: auto;
}

h1 {
  font-size: 28px;
  margin: 0;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin: 12px 0;
}

p {
  margin: 0;
}

/* Notice / Flask hint */

.notice {
  margin-top: 6px;
  padding: 12px 14px;
  font-size: 14px;
  border-radius: 12px;
  background: var(--qtum-blue-bg-soft);
  border: 1px solid var(--qtum-blue-border-soft);
}

.warning-notice {
  background: var(--warning-amber-bg-soft);
  border-color: var(--warning-amber-border-soft);
  color: #fbbf24;
}

.notice a {
  color: var(--qtum-blue-softer);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Buttons row */

.buttons {
  margin: 18px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

button {
  border: none;
  border-radius: 999px;
  padding: 13px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.05s ease, box-shadow 0.05s ease,
    background 0.15s ease, opacity 0.15s ease, border-color 0.15s ease;
}

button:disabled {
  opacity: 0.9;              /* less “faded” */
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Normal primary button */
.btn-primary {
  background: linear-gradient(135deg, var(--qtum-blue), var(--qtum-blue-light));
  color: white;
  box-shadow: 0 18px 52px rgba(6, 69, 247, 0.55);
}

/* Hover only when enabled */
.btn-primary:not(:disabled):hover {
  transform: translateY(-1px);
  box-shadow: 0 22px 64px rgba(6, 69, 247, 0.7);
}

/* Disabled primary: gray gradient */
.btn-primary:disabled {
  background: linear-gradient(135deg, #4b5563, #111827); /* slate -> near-black */
  color: #e5e7eb;
  box-shadow: none;
}

.btn-secondary {
  background: transparent;
  color: #e5e7eb;
  border: 1px solid rgba(148, 163, 184, 0.75);
}

.btn-secondary:not(:disabled):hover {
  border-color: rgba(169, 196, 255, 0.95);
  background: rgba(6, 69, 247, 0.06);
}

.advanced-options {
  margin-bottom: 0;
}

.switch-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  cursor: pointer;
}

.switch-wrapper[disabled],
.switch-wrapper[disabled] .switch-label,
.switch-wrapper[disabled] .slider {
  opacity: 0.8;
  cursor: not-allowed;
}

.switch-label {
  font-size: 14px;
  font-weight: 600;
  color: #e5e7eb;
  cursor: pointer;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #374151;
  transition: .3s;
  border-radius: 34px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

input:checked + .slider {
  background-color: #0645f7;
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.advanced-options-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin: 0;
  padding: 0 16px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.85);
  border: 0px solid #374151;
  transition: all 0.3s ease-out;
}

.advanced-options-content.expanded {
  max-height: 400px;
  opacity: 1;
  margin-top: 12px;
  margin-bottom: 18px;
  padding: 16px;
  border-width: 1px;
}

.advanced-options-content label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
}

.advanced-options-content .notice {
  margin-top: 14px;
}

.advanced-options-content input {
  width: 100%;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid #4b5563;
  background: #1e293b;
  color: #f9fafb;
  font-size: 14px;
}

/* Status text */

.status {
  font-size: 14px;
  color: #d1d5db;
}

.status-line-strong {
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 6px;
}

.status-line-muted {
  font-size: 15px;
  color: #9ca3af;
}

/* Footer */

.footer {
  max-width: 850px;
  margin-top: 25px;
  font-size: 14px;
  color: #6b7280;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.footer a {
  color: var(--qtum-blue-softer);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* =========================
   Screenshots card + carousel
   ========================= */

.screenshots-card {
  flex: 0 0 320px;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* Row: prev button – image – next button */
.carousel {
  margin-top: 6px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
}

.carousel-viewport {
  border-radius: 18px;
  overflow: hidden;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(148, 163, 184, 0.35);
}

/* Phone screenshot */
#carousel-image {
  width: 100%;
  height: auto;
  display: block;
}

.carousel-arrow {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.carousel-arrow:hover {
  border-color: rgba(169, 196, 255, 0.95);
  background: rgba(6, 69, 247, 0.12);
}

.carousel-caption {
  margin-top: 12px;
  font-size: 12px;
  color: #e5e7eb;
  text-align: center;
}

.carousel-dots {
  margin-top: 12px;
  display: flex;
  justify-content: center;
  gap: 6px;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  border: none;
  padding: 0;
  background: rgba(148, 163, 184, 0.7);
  cursor: pointer;
  transition: transform 0.08s ease, background 0.12s ease;
}

.carousel-dot.active {
  width: 18px;
  background: #0645f7; /* Qtum blue */
  transform: scale(1.05);
}

.hidden {
  display: none;
}

/* =========================
   Mobile layout
   ========================= */

@media (max-width: 768px) {
  .card {
    flex-direction: column;
    padding: 24px 18px 18px;
  }

  /* Screenshot card below main content, full width */
  .screenshots-card {
    flex: none;
    max-width: 100%;
    width: 100%;
    margin-top: 12px;
  }

  .buttons {
    flex-direction: column;
    align-items: stretch;
  }

  button {
    width: 100%;
    justify-content: center;
  }

  .footer {
    text-align: center;
  }
}