:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --border: #e0e0e0;
  --text: #1a1a1a;
  --text-muted: #666;
  --accent: #4f6ef7;
  --accent-hover: #3b56d4;
  --danger: #e53e3e;
  --success: #38a169;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --surface: #1e1e1e;
    --border: #333;
    --text: #f0f0f0;
    --text-muted: #999;
    --shadow: 0 2px 12px rgba(0,0,0,0.4);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  width: 100%;
  max-width: 560px;
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
button:hover { background: var(--accent-hover); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.secondary {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
button.secondary:hover { background: var(--accent); color: #fff; }
button.danger { background: var(--danger); }

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1.5rem;
}
.tab-btn {
  background: none;
  color: var(--text-muted);
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  margin-bottom: -2px;
  padding: 0.6rem 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.tab-btn:hover { background: none; color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

/* Share URL */
.share-url-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.share-url-row input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
  color: var(--text);
  font-size: 0.85rem;
  font-family: monospace;
}

/* Peers */
.peers-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.peer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1.25rem;
  min-height: 2rem;
}
.peer-item {
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
}
.dot.waiting { background: var(--text-muted); }
.empty-peers { color: var(--text-muted); font-size: 0.85rem; font-style: italic; }

/* File drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  margin-bottom: 1rem;
  color: var(--text-muted);
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  color: var(--text);
}
.drop-zone input { display: none; }
.drop-zone .drop-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.drop-zone .drop-hint { font-size: 0.9rem; }
.drop-zone .drop-hint strong { color: var(--accent); }

/* Progress */
.progress-wrap {
  margin: 1rem 0;
}
.progress-bar-bg {
  background: var(--border);
  border-radius: 99px;
  height: 8px;
  overflow: hidden;
  margin-top: 0.4rem;
}
.progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width 0.1s;
}
.progress-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* Status messages */
.status-msg {
  font-size: 0.875rem;
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}
.status-msg.info { background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); }
.status-msg.success { background: color-mix(in srgb, var(--success) 12%, transparent); color: var(--success); }
.status-msg.error { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger); }

/* Lifetime select */
select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
}

.row { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; margin-bottom: 1rem; }

/* Incoming file request card */
.file-request-card {
  border: 1.5px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 0.75rem;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}
.file-request-info {
  font-size: 0.875rem;
  margin-bottom: 0.6rem;
  color: var(--text);
}
.file-request-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.file-request-actions .accept-btn {
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
}
.file-request-actions .deny-btn {
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
}
.request-countdown {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

#app { width: 100%; max-width: 560px; }