:root {
  --bg-0: #0e1412;
  --bg-1: #16201c;
  --bg-2: #1e2b26;
  --ink: #e8f0eb;
  --ink-dim: #9db0a6;
  --ink-faint: #6d8077;
  --line: rgba(232, 240, 235, 0.12);
  --accent: #7dffb3;
  --accent-ink: #062214;
  --warn: #ffb86b;
  --danger: #ff7a7a;
  --radius: 14px;
  --font: "Instrument Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg-0);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  z-index: 0;
}

.glow {
  position: fixed;
  inset: auto auto -20% -10%;
  width: 70vw;
  height: 70vw;
  max-width: 900px;
  max-height: 900px;
  background: radial-gradient(circle, rgba(125, 255, 179, 0.14), transparent 65%);
  filter: blur(20px);
  pointer-events: none;
  z-index: 0;
  animation: drift 14s ease-in-out infinite alternate;
}

@keyframes drift {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(12%, -8%) scale(1.08);
  }
}

.shell {
  position: relative;
  z-index: 1;
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.top {
  margin-bottom: 2rem;
  animation: rise 0.6s ease both;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mark {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 3px;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(125, 255, 179, 0.12);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 4px rgba(125, 255, 179, 0.1);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(125, 255, 179, 0.18);
  }
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
}

.tagline {
  margin: 0.85rem 0 0;
  color: var(--ink-dim);
  font-size: 1.05rem;
  max-width: 28rem;
}

.gate {
  animation: rise 0.7s ease 0.05s both;
}

.gate-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.join {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.hint {
  margin: 1.1rem 0 0;
  color: var(--ink-faint);
  font-size: 0.95rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--ink);
  font: inherit;
  font-weight: 560;
  padding: 0.7rem 1.05rem;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(232, 240, 235, 0.28);
}

.btn:active {
  transform: translateY(0);
}

.btn.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
}

.btn.primary:hover {
  filter: brightness(1.05);
}

.btn.ghost {
  background: transparent;
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
}

.btn.danger {
  color: var(--danger);
}

.code-input {
  width: 7.5rem;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.7rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-1);
  color: var(--ink);
  outline: none;
}

.code-input:focus {
  border-color: rgba(125, 255, 179, 0.55);
  box-shadow: 0 0 0 3px rgba(125, 255, 179, 0.12);
}

.room {
  animation: rise 0.55s ease both;
}

.room.hidden,
.hidden {
  display: none !important;
}

.room-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(22, 32, 28, 0.72);
  backdrop-filter: blur(8px);
  margin-bottom: 1rem;
}

.room-meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.room-meta.end {
  margin-left: auto;
}

.label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.room-code {
  font-family: var(--mono);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.ttl {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--warn);
}

.panels {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1rem;
}

@media (max-width: 860px) {
  .panels {
    grid-template-columns: 1fr;
  }
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(30, 43, 38, 0.95), rgba(22, 32, 28, 0.92));
  box-shadow: var(--shadow);
  padding: 1rem;
  min-height: 420px;
  display: flex;
  flex-direction: column;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
}

.panel-head h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.status {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.status.muted {
  color: var(--ink-faint);
}

#clipboard {
  flex: 1;
  width: 100%;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(8, 12, 10, 0.55);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.92rem;
  line-height: 1.55;
  padding: 1rem;
  outline: none;
  min-height: 280px;
}

#clipboard:focus {
  border-color: rgba(125, 255, 179, 0.4);
}

.panel-foot {
  display: flex;
  gap: 0.35rem;
  margin-top: 0.65rem;
}

.dropzone {
  border: 1.5px dashed rgba(125, 255, 179, 0.35);
  border-radius: 10px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  background: rgba(125, 255, 179, 0.03);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.dragover {
  background: rgba(125, 255, 179, 0.08);
  border-color: var(--accent);
  outline: none;
}

.dropzone.dragover {
  transform: scale(1.01);
}

.drop-title {
  margin: 0;
  font-weight: 600;
}

.drop-sub {
  margin: 0.35rem 0 0;
  color: var(--ink-faint);
  font-size: 0.9rem;
}

.file-list {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  overflow: auto;
  max-height: 280px;
}

.file-list:empty::after {
  content: "No files yet.";
  color: var(--ink-faint);
  font-size: 0.9rem;
}

.file-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem 0.75rem;
  align-items: center;
  padding: 0.7rem 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(8, 12, 10, 0.4);
  animation: rise 0.35s ease both;
}

.file-name {
  font-size: 0.92rem;
  word-break: break-all;
}

.file-meta {
  grid-column: 1 / -1;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
}

.file-actions {
  display: flex;
  gap: 0.25rem;
}

.error {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  background: rgba(255, 122, 122, 0.12);
  border: 1px solid rgba(255, 122, 122, 0.35);
  color: #ffc4c4;
}

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

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}