:root {
  --page-bg: #0b0e12;
  --modal-bg: #151a21;
  --modal-border: #252d38;
  --card-bg: #1c222b;
  --card-border: #2a3340;
  --card-hover: #222a35;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.18);
  --radius-lg: 16px;
  --radius-md: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page-bg);
  color: var(--text);
  line-height: 1.45;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.backdrop {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem 2rem;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.12), transparent),
    var(--page-bg);
}

.download-modal {
  width: 100%;
  max-width: 480px;
  background: var(--modal-bg);
  border: 1px solid var(--modal-border);
  border-radius: var(--radius-lg);
  box-shadow:
    0 24px 48px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.35rem 1.35rem 0.75rem;
}

.modal-header h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-line {
  margin: 0.35rem 0 0;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.brand-line a {
  color: var(--text-muted);
  font-weight: 500;
}

.brand-line a:hover {
  color: var(--text);
}

.header-logo {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  background: #e5e9f4;
  padding: 6px;
  flex-shrink: 0;
}

.version-bar {
  margin: 0 1rem 1rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.25);
  border-radius: 8px;
  border: 1px solid var(--modal-border);
}

.version-bar strong {
  color: var(--text);
  font-weight: 600;
}

.platform-list {
  padding: 0 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.linux-deb-note {
  margin: -0.35rem 0 0;
  padding: 0 0.15rem;
  font-size: 0.78rem;
  text-align: right;
}

.linux-deb-note a {
  color: var(--accent);
  font-weight: 500;
}

.platform-card {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr 44px;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0.9rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  text-align: left;
  transition:
    background 0.15s ease,
    border-color 0.15s ease;
}

.platform-card--interactive {
  cursor: pointer;
}

.platform-card--interactive:hover {
  background: var(--card-hover);
  border-color: #3d4a5c;
}

.platform-card--recommended {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.35);
  background: linear-gradient(145deg, rgba(59, 130, 246, 0.08), var(--card-bg));
}

.platform-card--disabled {
  opacity: 0.65;
  cursor: default;
}

.badge-recommended {
  position: absolute;
  top: 0.5rem;
  right: 3rem;
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #93c5fd;
  background: var(--accent-soft);
  border: 1px solid rgba(59, 130, 246, 0.35);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.os-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
}

.os-icon svg {
  display: block;
}

.platform-body .os-name {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}

.platform-body .os-detail {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.platform-body .os-size {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}

.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease;
}

.platform-card--interactive .download-btn:hover {
  background: var(--accent);
  color: #fff;
}

.platform-card--disabled .download-btn {
  opacity: 0.4;
  cursor: not-allowed;
}

.loading-block,
.error-block {
  padding: 1.5rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.modal-footer {
  padding: 0.85rem 1.25rem 1.15rem;
  border-top: 1px solid var(--modal-border);
  font-size: 0.78rem;
  color: var(--text-dim);
  text-align: center;
}

.modal-footer a {
  color: var(--text-muted);
}

.modal-footer a:hover {
  color: var(--text);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}