/* ============================================
   QuizApp — shared styles
   ============================================ */

:root {
  --bg-top: #4b4ee7;
  --bg-bottom: #7c3aed;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #4b4ee7;
  --accent-dark: #3a3dc4;
  --green: #22c55e;
  --green-dark: #16a34a;
  --red: #ef4444;
  --yellow: #fbbf24;
  --pink: #ec4899;
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(160deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  overflow-x: hidden;
}

/* --- Floating background shapes --- */

.shapes {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.shape {
  position: absolute;
  border-radius: 26%;
  opacity: 0.16;
  animation: drift 18s ease-in-out infinite;
}

.shape:nth-child(1) { width: 140px; height: 140px; background: var(--yellow); top: 8%;  left: 6%;  animation-delay: 0s; }
.shape:nth-child(2) { width: 90px;  height: 90px;  background: var(--pink);   top: 62%; left: 12%; animation-delay: -4s; }
.shape:nth-child(3) { width: 170px; height: 170px; background: #38bdf8;       top: 14%; right: 8%; animation-delay: -8s; }
.shape:nth-child(4) { width: 110px; height: 110px; background: var(--green);  bottom: 10%; right: 14%; animation-delay: -12s; }

@keyframes drift {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-28px) rotate(18deg); }
}

@media (prefers-reduced-motion: reduce) {
  .shape { animation: none; }
}

/* --- Card --- */

.card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border-radius: 24px;
  padding: 36px 32px 32px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

.brand {
  text-align: center;
  margin-bottom: 24px;
}

.brand h1 {
  margin: 0;
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.brand h1 span {
  color: var(--pink);
}

.brand p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* --- Tabs --- */

.tabs {
  display: flex;
  gap: 6px;
  background: #f3f4f6;
  border-radius: 12px;
  padding: 5px;
  margin-bottom: 22px;
}

.tab {
  flex: 1;
  border: 0;
  background: transparent;
  padding: 10px 0;
  border-radius: 9px;
  font: inherit;
  font-weight: 800;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.tab[aria-selected="true"] {
  background: var(--card);
  color: var(--accent);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

/* --- Form --- */

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 6px;
}

.field input {
  width: 100%;
  padding: 13px 14px;
  font: inherit;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: #fafafa;
  transition: border-color 0.15s, background 0.15s;
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card);
}

/* --- Buttons (chunky, with press-down shadow) --- */

.btn {
  display: block;
  width: 100%;
  border: 0;
  padding: 14px 0;
  font: inherit;
  font-weight: 900;
  font-size: 1.05rem;
  color: #fff;
  border-radius: 12px;
  cursor: pointer;
  background: var(--accent);
  box-shadow: 0 4px 0 var(--accent-dark);
  transition: transform 0.08s, box-shadow 0.08s, filter 0.15s;
}

.btn:hover:not(:disabled) { filter: brightness(1.07); }

.btn:active:not(:disabled) {
  transform: translateY(4px);
  box-shadow: 0 0 0 var(--accent-dark);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-green {
  background: var(--green);
  box-shadow: 0 4px 0 var(--green-dark);
}

.btn-green:active:not(:disabled) { box-shadow: 0 0 0 var(--green-dark); }

.btn-ghost {
  background: #f3f4f6;
  color: var(--text);
  box-shadow: 0 4px 0 #d1d5db;
}

.btn-ghost:active:not(:disabled) { box-shadow: 0 0 0 #d1d5db; }

/* --- Divider --- */

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 2px;
  background: var(--border);
}

/* --- Messages --- */

.msg {
  margin: 0 0 16px;
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 700;
}

.msg[hidden] { display: none; }

.msg-error {
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.msg-ok {
  background: #f0fdf4;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.note {
  margin: 18px 0 0;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ============================================
   Lobby — host and join screens
   ============================================ */

/* The host's roster can get long, so that card gets more room. */
.card-wide {
  max-width: 520px;
}

/* Anchors styled as buttons need the text centred and the
   underline removed, since <a> doesn't inherit either. */
.btn-link {
  text-decoration: none;
  text-align: center;
  line-height: 1.35;
}

/* --- Game code panel --- */

.code-panel {
  background: linear-gradient(160deg, var(--accent) 0%, var(--bg-bottom) 100%);
  border-radius: var(--radius);
  padding: 20px 18px 18px;
  text-align: center;
  color: #fff;
  margin-bottom: 22px;
}

.code-label {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.85;
}

.code-label strong {
  font-weight: 900;
  opacity: 1;
}

.code {
  margin: 8px 0 14px;
  font-size: clamp(2.6rem, 14vw, 3.6rem);
  font-weight: 900;
  /* Wide tracking so a code read off a projector can't be
     misheard as two letters run together. */
  letter-spacing: 0.14em;
  line-height: 1;
  /* Lets players double-tap the code to select just the code. */
  user-select: all;
}

.code-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.chip-btn {
  border: 0;
  padding: 8px 14px;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 800;
  border-radius: 999px;
  cursor: pointer;
  color: #fff;
  background: rgba(255, 255, 255, 0.22);
  transition: background 0.15s;
}

.chip-btn:hover {
  background: rgba(255, 255, 255, 0.34);
}

/* --- Code entry --- */

.code-input {
  text-align: center;
  font-size: 1.7rem;
  font-weight: 900;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.code-input::placeholder {
  letter-spacing: 0.22em;
  font-weight: 700;
  color: #d1d5db;
}

/* --- "You're in" panel --- */

.joined-panel {
  background: #f0fdf4;
  border: 2px solid #bbf7d0;
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
  margin-bottom: 22px;
}

.joined-label {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--green-dark);
}

.joined-name {
  margin: 4px 0 2px;
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--text);
  /* A long nickname shouldn't push the panel wider than the card. */
  overflow-wrap: anywhere;
}

.joined-sub {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 700;
}

/* --- Roster --- */

.roster-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.roster-head h2,
.roster-head-simple {
  margin: 0 0 10px;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.roster-head h2 {
  margin-bottom: 0;
}

.roster {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  /* Keeps a full 40-player lobby from running off the screen. */
  max-height: 300px;
  overflow-y: auto;
}

.player {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: #f9fafb;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  animation: pop-in 0.22s ease-out;
}

.player-me {
  background: #eef2ff;
  border-color: #c7d2fe;
}

.player-name {
  font-weight: 800;
  overflow-wrap: anywhere;
}

.roster-empty {
  text-align: center;
  padding: 22px 14px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.roster-empty[hidden] {
  display: none;
}

.kick-btn {
  flex-shrink: 0;
  border: 0;
  background: transparent;
  padding: 5px 9px;
  border-radius: 8px;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.kick-btn:hover {
  background: #fef2f2;
  color: #b91c1c;
}

.pill {
  flex-shrink: 0;
  font-size: 0.68rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
}

.pill[hidden] {
  display: none;
}

@keyframes pop-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --- Waiting states --- */

.spinner {
  width: 38px;
  height: 38px;
  margin: 6px auto 16px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.status {
  margin: 0 0 20px;
  text-align: center;
  font-weight: 700;
  color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2.4s; }
  .player { animation: none; }
}