:root {
  --bg: #0b0e1a;
  --bg-2: #11152a;
  --panel: rgba(28, 34, 60, 0.55);
  --panel-solid: #161b30;
  --stroke: rgba(255, 255, 255, 0.08);
  --stroke-strong: rgba(255, 255, 255, 0.16);
  --accent: #5b8cff;
  --accent-2: #3ad29f;
  --accent-3: #b06bff;
  --text: #eef1fb;
  --muted: #9aa3c7;
  --danger: #ff6b6b;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- Animated background ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 600px at 15% -5%, rgba(91, 140, 255, 0.22), transparent 60%),
    radial-gradient(800px 600px at 90% 0%, rgba(176, 107, 255, 0.18), transparent 55%),
    radial-gradient(900px 700px at 50% 110%, rgba(58, 210, 159, 0.16), transparent 55%),
    var(--bg);
}
.bg::before,
.bg::after {
  content: '';
  position: absolute;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  background: radial-gradient(circle, rgba(91, 140, 255, 0.5), transparent 65%);
  animation: drift 22s ease-in-out infinite alternate;
}
.bg::after {
  background: radial-gradient(circle, rgba(58, 210, 159, 0.45), transparent 65%);
  right: -10vmax;
  top: 20vmax;
  animation-duration: 28s;
  animation-direction: alternate-reverse;
}
@keyframes drift {
  0% { transform: translate(-10vmax, -8vmax) scale(1); }
  100% { transform: translate(12vmax, 10vmax) scale(1.25); }
}

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  backdrop-filter: blur(14px);
  background: rgba(11, 14, 26, 0.55);
  border-bottom: 1px solid var(--stroke);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: 0.2px;
}
.brand-mark {
  filter: drop-shadow(0 0 10px rgba(91, 140, 255, 0.6));
}
/* منوی کشوییِ زبان — سفارشی (نه <select>ِ بومی) تا لیستِ بازشونده هم با طراحیِ سایت یکی باشد */
.lang {
  position: relative;
  display: inline-flex;
}
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--stroke-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.lang-btn:hover,
.lang.open .lang-btn {
  border-color: var(--accent);
  color: var(--text);
  background: rgba(91, 140, 255, 0.08);
}
.lang-current {
  color: var(--text);
  font-weight: 600;
}
.lang-caret {
  width: 15px;
  height: 15px;
  color: var(--muted);
  flex: none;
  transition: transform 0.2s ease;
}
.lang.open .lang-caret {
  transform: rotate(180deg);
}
.lang-list {
  position: absolute;
  top: calc(100% + 8px);
  inset-inline-end: 0;
  z-index: 50;
  min-width: 184px;
  max-height: 320px;
  overflow-y: auto;
  list-style: none;
  margin: 0;
  padding: 6px;
  background: var(--panel-solid);
  border: 1px solid var(--stroke-strong);
  border-radius: 14px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.lang.open .lang-list {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.lang-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 10px;
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.12s ease;
}
.lang-list li:hover {
  background: rgba(255, 255, 255, 0.06);
}
/* `.lang-list li { display:flex }` outranks the UA [hidden] rule, so make the
   hidden attribute win explicitly — this is what the search filter relies on. */
.lang-list li[hidden] {
  display: none !important;
}
.lang-list li.selected {
  color: #cbd8ff;
}
.lang-list li.selected::after {
  content: "✓";
  color: var(--accent);
  font-weight: 700;
}
/* Search box pinned to the top of the dropdown */
.lang-search-wrap {
  position: sticky;
  top: -6px;
  z-index: 1;
  display: block !important;
  padding: 8px 2px !important;
  margin: -6px -6px 4px;
  background: var(--panel-solid);
  cursor: default !important;
}
.lang-search-wrap:hover {
  background: var(--panel-solid) !important;
}
.lang-search {
  width: 100%;
  box-sizing: border-box;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--stroke-strong);
  border-radius: 9px;
  padding: 8px 11px;
  font-size: 0.9rem;
  outline: none;
}
.lang-search::placeholder {
  color: var(--muted);
}
.lang-search:focus {
  border-color: var(--accent);
}
.lang-noresult {
  justify-content: center !important;
  color: var(--muted);
  font-size: 0.86rem;
  cursor: default !important;
}
.lang-noresult:hover {
  background: transparent !important;
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding: 46px 18px 18px;
}
.hero-title {
  margin: 0;
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 850;
  letter-spacing: -0.5px;
  background: linear-gradient(100deg, #fff 10%, #b7c6ff 45%, #8effd9 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-title .brand-mark {
  -webkit-text-fill-color: initial;
}
.hero-sub {
  margin: 12px auto 22px;
  max-width: 640px;
  color: var(--muted);
  font-size: clamp(1rem, 2.6vw, 1.2rem);
}
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--stroke);
  backdrop-filter: blur(8px);
  font-size: 0.9rem;
}
.chip-key {
  color: var(--muted);
}
.chip strong {
  color: var(--accent-2);
  font-variant-numeric: tabular-nums;
}
.chip-ip {
  color: var(--muted);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}
.icon-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1;
  padding: 2px 5px;
  border-radius: 7px;
  transition: color 0.15s ease, background 0.15s ease;
}
.icon-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}
.peer .sub.ip {
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}
.chip .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--muted);
  box-shadow: 0 0 0 0 rgba(58, 210, 159, 0.5);
}
.chip.status.online .dot {
  background: var(--accent-2);
  animation: ping 1.8s ease-out infinite;
}
.chip.status.online {
  color: var(--text);
}
.chip.status.connecting .dot {
  background: #f5c451;
  animation: ping 1.2s ease-out infinite;
}
.chip.status.offline .dot {
  background: var(--danger);
}
@keyframes ping {
  0% { box-shadow: 0 0 0 0 rgba(58, 210, 159, 0.5); }
  70% { box-shadow: 0 0 0 10px rgba(58, 210, 159, 0); }
  100% { box-shadow: 0 0 0 0 rgba(58, 210, 159, 0); }
}

/* ---------- Layout ---------- */
main {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  padding: 18px 18px 60px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 20px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}
.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.panel-head h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}
.badge {
  margin-inline-start: auto;
  min-width: 26px;
  height: 26px;
  padding: 0 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #06121f;
  font-weight: 800;
  font-size: 0.82rem;
}
.hint {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---------- Peers ---------- */
.peers {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
}
.peer {
  position: relative;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 22px 14px 18px;
  text-align: center;
  cursor: pointer;
  user-select: none;
  transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease, box-shadow 0.16s ease;
  animation: cardIn 0.35s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(10px) scale(0.96); }
  to { opacity: 1; transform: none; }
}
.peer:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  background: rgba(91, 140, 255, 0.08);
  box-shadow: 0 12px 30px rgba(91, 140, 255, 0.18);
}
.peer .avatar {
  position: relative;
  width: 58px;
  height: 58px;
  margin: 0 auto 10px;
  display: grid;
  place-items: center;
  font-size: 1.8rem;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 25%, rgba(91, 140, 255, 0.35), rgba(58, 210, 159, 0.18));
}
.peer .avatar::after {
  content: '';
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 2px solid rgba(91, 140, 255, 0.35);
  animation: ping 2.4s ease-out infinite;
}
.peer .name {
  font-weight: 700;
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}
.peer .sub {
  font-size: 0.76rem;
  color: var(--muted);
  margin-top: 5px;
}
.peer.dragover {
  border-color: var(--accent-2);
  background: rgba(58, 210, 159, 0.12);
  transform: translateY(-4px) scale(1.02);
}

/* ---------- Empty / radar ---------- */
.empty {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 30px 20px;
  color: var(--muted);
  text-align: center;
}
.radar {
  position: relative;
  width: 110px;
  height: 110px;
  display: grid;
  place-items: center;
}
.radar i {
  font-size: 1.9rem;
  filter: drop-shadow(0 0 10px rgba(91, 140, 255, 0.6));
}
.radar span {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid rgba(91, 140, 255, 0.4);
  animation: sweep 2.6s ease-out infinite;
}
.radar span:nth-child(2) { animation-delay: 0.85s; }
.radar span:nth-child(3) { animation-delay: 1.7s; }
@keyframes sweep {
  0% { transform: scale(0.25); opacity: 0.9; }
  100% { transform: scale(1); opacity: 0; }
}

/* ---------- Transfers ---------- */
.transfers {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.muted-note {
  margin: 4px 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.transfer {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--stroke);
  border-radius: 14px;
  padding: 14px 16px;
  animation: cardIn 0.3s ease both;
}
.transfer .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 9px;
}
.transfer .title {
  font-weight: 650;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.transfer .meta {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.bar {
  position: relative;
  height: 9px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 6px;
  overflow: hidden;
}
.bar > span {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.15s ease;
}
.transfer:not(.done) .bar > span::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transform: translateX(-100%);
  animation: shimmer 1.3s linear infinite;
}
@keyframes shimmer {
  to { transform: translateX(100%); }
}
.transfer .actions {
  margin-top: 11px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #06121f;
  border: none;
  border-radius: 11px;
  padding: 9px 18px;
  font-size: 0.9rem;
  font-weight: 750;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.12s ease, filter 0.12s ease;
}
.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.07);
}
.transfer.done .meta {
  color: var(--accent-2);
}
.transfer.failed .meta {
  color: var(--danger);
}
.transfer.retrying .meta {
  color: #f5c451;
}
.transfer.retrying .bar > span {
  background: linear-gradient(90deg, #f5c451, #ff9d5c);
  opacity: 0.85;
}
.icon-btn.cancel {
  font-size: 0.8rem;
  padding: 1px 6px;
}

/* ---------- Connect over the internet ---------- */
.badge.globe-badge {
  background: rgba(176, 107, 255, 0.16);
  color: var(--accent-3);
  font-size: 1rem;
}
.peer.remote {
  border-color: rgba(176, 107, 255, 0.45);
}
.peer.remote .sub {
  color: var(--accent-3);
}
.code-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: stretch;
}
.my-code,
.join-code {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 220px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--stroke);
  border-radius: 14px;
  padding: 12px 14px;
}
.code-key {
  color: var(--muted);
  font-size: 0.85rem;
  white-space: nowrap;
}
.code-value {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color: var(--text);
  user-select: all;
}
.btn-sm {
  margin-inline-start: auto;
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--stroke-strong);
  border-radius: 9px;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 650;
  cursor: pointer;
  white-space: nowrap;
  transition: filter 0.12s ease, border-color 0.12s ease;
}
.btn-sm:hover {
  filter: brightness(1.15);
  border-color: var(--accent);
}
#peer-code {
  flex: 1 1 auto;
  min-width: 0;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--stroke-strong);
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  font-variant-numeric: tabular-nums;
  outline: none;
}
#peer-code:focus {
  border-color: var(--accent);
}
.join-code .btn {
  flex: 0 0 auto;
}
.code-note {
  margin: 12px 0 0;
  min-height: 1.1em;
  font-size: 0.9rem;
  color: var(--muted);
}
.code-note.ok {
  color: var(--accent-2);
}
.code-note.warn {
  color: #f5c451;
}

/* ---------- About / SEO content ---------- */
.about {
  margin-top: 8px;
  padding: 26px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.02);
}
.about h2 {
  margin: 0 0 10px;
  font-size: 1.35rem;
}
.about .lead {
  color: var(--muted);
  max-width: 70ch;
  margin: 0 0 22px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.info-card {
  background: var(--panel);
  border: 1px solid var(--stroke);
  border-radius: 14px;
  padding: 18px 20px;
}
.info-ic {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  font-size: 1.2rem;
  background: radial-gradient(circle at 30% 25%, rgba(91, 140, 255, 0.35), rgba(58, 210, 159, 0.15));
  margin-bottom: 10px;
}
.info-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}
.info-card ol,
.info-card ul {
  margin: 0;
  padding-inline-start: 20px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

footer {
  text-align: center;
  padding: 22px 16px 30px;
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 540px) {
  .hero {
    padding-top: 32px;
  }
  .peers {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
  }
}