:root {
  --bg: #0b3d2e; /* pine green */
  --bubble: #ffffff;
  --text: #111111;
  --muted: rgba(255, 255, 255, 0.78);
  --muted2: rgba(0, 0, 0, 0.58);
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.22);
  --radius: 18px;
  --radius2: 14px;
  --maxw: 980px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: radial-gradient(
      1000px 600px at 40% 10%,
      rgba(255, 255, 255, 0.08),
      rgba(255, 255, 255, 0) 60%
    ),
    var(--bg);
  color: white;
  font-family: Helvetica, Arial, sans-serif;
}

.app {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 18px 40px;
}

.header {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.title {
  margin: 0;
  font-size: clamp(34px, 5vw, 54px);
  letter-spacing: -0.02em;
  font-weight: 800;
}

.subtitle {
  margin: 0;
  font-size: 18px;
  color: var(--muted);
}

.promptPanel {
  margin-top: 18px;
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
  box-shadow: var(--shadow);
}

.promptGrid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

@media (min-width: 720px) {
  .promptGrid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.promptBtn {
  appearance: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  padding: 14px 14px;
  border-radius: 16px;
  background: var(--bubble);
  color: var(--text);
  font-family: Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.25;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.16);
  transform: translateY(0);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.promptBtn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
}

.hint {
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
}

.hidden {
  display: none !important;
}

.arena {
  margin-top: 18px;
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
  box-shadow: var(--shadow);
  min-height: 58vh;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 14px;
}

.arenaTop {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.selectedPrompt {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.restartBtn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.08);
  color: white;
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
  font-family: Helvetica, Arial, sans-serif;
  transition: background 140ms ease, transform 140ms ease;
}

.restartBtn:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-1px);
}

.chat {
  display: grid;
  gap: 10px;
  align-content: start;
  overflow: auto;
  padding: 4px 2px 10px;
  scroll-behavior: smooth;
}

.bubble {
  width: min(78%, 640px);
  background: var(--bubble);
  color: var(--text);
  border-radius: var(--radius);
  padding: 12px 12px 11px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.18);
  opacity: 0;
  transform: translateY(10px);
  animation: popIn 260ms ease forwards;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.bubble[data-side="left"] {
  justify-self: start;
  border-bottom-left-radius: 6px;
}

.bubble[data-side="right"] {
  justify-self: end;
  border-bottom-right-radius: 6px;
}

.meta {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 6px;
}

.name {
  font-weight: 800;
  letter-spacing: -0.01em;
}

.role {
  font-size: 12px;
  color: var(--muted2);
  font-weight: 700;
}

.text {
  font-size: 15px;
  line-height: 1.35;
  white-space: pre-wrap;
}

.typing .text {
  display: flex;
  align-items: center;
  min-height: 20px;
}

.dots {
  display: inline-flex;
  gap: 6px;
}

.dot {
  width: 7px;
  height: 7px;
  background: rgba(0, 0, 0, 0.28);
  border-radius: 999px;
  animation: bounce 900ms ease-in-out infinite;
}

.dot:nth-child(2) {
  animation-delay: 120ms;
}
.dot:nth-child(3) {
  animation-delay: 240ms;
}

@keyframes popIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.55;
  }
  50% {
    transform: translateY(-4px);
    opacity: 1;
  }
}