:root {
  --background: #11131d;
  --panel: rgba(31, 33, 47, 0.78);
  --panel-solid: #1d1f2d;
  --text: #f7f7fb;
  --muted: #9c9eac;
  --line: rgba(255, 255, 255, 0.1);
  --cyan: #62ddff;
  --pink: #ff6db0;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--background);
  font-family: "DM Sans", sans-serif;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  content: "";
  opacity: 0.8;
  background:
    radial-gradient(circle at 15% 15%, rgba(98, 221, 255, 0.13), transparent 32%),
    radial-gradient(circle at 85% 85%, rgba(255, 109, 176, 0.12), transparent 35%);
}

button, input { font: inherit; }
button { cursor: pointer; border: 0; }
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }

.app {
  display: flex;
  flex-direction: column;
  width: min(100% - 32px, 980px);
  min-height: 100vh;
  margin: auto;
  padding: 32px 0;
}

.site-header { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 11px; font: 700 20px "Space Grotesk"; letter-spacing: -0.03em; }
.brand-mark { display: grid; width: 35px; height: 35px; place-items: center; border: 1px solid rgba(98, 221, 255, 0.5); border-radius: 11px; color: var(--cyan); background: rgba(98, 221, 255, 0.08); }
.eyebrow { color: var(--cyan); font-size: 11px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }
.hero { max-width: 720px; margin: auto; text-align: center; }
h1 { margin: 18px 0 14px; font: 700 clamp(42px, 8vw, 76px)/0.98 "Space Grotesk"; letter-spacing: -0.06em; }
.hero-copy { max-width: 490px; margin: 0 auto 34px; color: var(--muted); line-height: 1.65; }
.setup-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; text-align: left; }
.card, .game-panel { border: 1px solid var(--line); background: var(--panel); backdrop-filter: blur(20px); box-shadow: var(--shadow); }
.card { padding: 25px; border-radius: 20px; transition: transform 0.2s, border-color 0.2s; }
.card:hover { transform: translateY(-3px); border-color: rgba(255, 255, 255, 0.2); }
.card h2 { margin: 0 0 8px; font: 600 20px "Space Grotesk"; }
.card p { min-height: 45px; margin: 0 0 21px; color: var(--muted); font-size: 14px; line-height: 1.55; }
.primary, .secondary { width: 100%; padding: 13px 17px; border-radius: 11px; font-weight: 700; transition: filter 0.2s, transform 0.2s; }
.primary { color: #0e1720; background: var(--cyan); }
.primary:hover { filter: brightness(1.1); transform: translateY(-1px); }
.join-row { display: flex; gap: 8px; }
input { width: 100%; padding: 13px 14px; color: var(--text); border: 1px solid var(--line); border-radius: 11px; outline: none; background: rgba(0, 0, 0, 0.18); text-transform: uppercase; letter-spacing: 0.12em; }
input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(98, 221, 255, 0.1); }
.join-row .primary { width: auto; white-space: nowrap; }
.error { min-height: 18px; margin-top: 10px; color: #ff91ae; font-size: 12px; }
.room-banner { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.room-code { color: var(--cyan); font: 700 27px "Space Grotesk"; letter-spacing: 0.13em; }
.copy-btn { padding: 9px 13px; color: var(--text); border: 1px solid var(--line); border-radius: 9px; background: transparent; font-size: 12px; }
.game-panel { width: min(100%, 560px); margin: auto; padding: clamp(20px, 5vw, 34px); border-radius: 24px; }
.status { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.turn { font: 600 18px "Space Grotesk"; }
.turn span { color: var(--cyan); }
.players, .waiting { color: var(--muted); font-size: 12px; }
.board { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.cell { display: grid; aspect-ratio: 1; place-items: center; border: 1px solid var(--line); border-radius: 16px; background: rgba(255, 255, 255, 0.045); font: 700 clamp(42px, 12vw, 76px)/1 "Space Grotesk"; transition: background 0.2s, transform 0.15s, border-color 0.2s; }
.cell:not(:disabled):hover { transform: scale(0.97); border-color: rgba(98, 221, 255, 0.55); background: rgba(98, 221, 255, 0.08); }
.cell:disabled { cursor: default; }
.cell.x { color: var(--cyan); text-shadow: 0 0 22px rgba(98, 221, 255, 0.45); animation: appear 0.25s ease-out; }
.cell.o { color: var(--pink); text-shadow: 0 0 22px rgba(255, 109, 176, 0.4); animation: appear 0.25s ease-out; }
.waiting { min-height: 18px; text-align: center; }
.leave { display: block; margin: 22px auto 0; color: var(--muted); background: transparent; font-size: 12px; text-decoration: underline; }
.modal { position: fixed; inset: 0; display: grid; place-items: center; padding: 20px; background: rgba(8, 9, 15, 0.72); backdrop-filter: blur(8px); }
.modal-card { width: min(100%, 370px); padding: 35px 28px 28px; border: 1px solid var(--line); border-radius: 22px; background: var(--panel-solid); box-shadow: var(--shadow); text-align: center; animation: rise 0.3s ease-out; }
.result-icon { font-size: 42px; }
.modal h2 { margin: 12px 0 7px; font: 700 29px "Space Grotesk"; }
.modal p { margin: 0 0 24px; color: var(--muted); }

@keyframes appear { from { opacity: 0; transform: scale(0.55); } to { opacity: 1; transform: scale(1); } }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 600px) {
  .app { width: min(100% - 24px, 500px); padding-top: 23px; }
  .setup-grid { grid-template-columns: 1fr; }
  .card p { min-height: auto; }
  .hero { margin: 12vh auto auto; }
  .room-banner { align-items: flex-start; flex-direction: column; gap: 8px; }
}