* { box-sizing: border-box; }

html {
  min-height: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  font-family: 'Kanit', 'Sarabun', 'Segoe UI', system-ui, sans-serif;
  color: #fff;
  background: #030712;
}

.qb-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
}

.qb-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.qb-vignette {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(ellipse at 50% 25%, transparent 15%, rgba(0, 0, 0, 0.4) 100%);
}

.qb-ui {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  min-height: 100dvh;
  padding: max(10px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(14px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  display: flex;
  flex-direction: column;
}

.qb-top {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  margin-bottom: 12px;
}

.qb-top-fill {
  flex: 1;
  min-width: 8px;
  pointer-events: none;
}

.qb-icon-btn {
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.qb-icon-btn img {
  display: block;
  height: clamp(38px, 10vw, 52px);
  width: auto;
  image-rendering: -webkit-optimize-contrast;
}

/* ย้อนกลับ — สเกลตามจอใหญ่ (ใกล้เคียง Main-Menu .menu-btn-back-img) */
.qb-icon-btn--back img {
  width: clamp(48px, 6.5vw, 76px);
  height: auto;
  max-height: clamp(56px, 8.5vw, 92px);
  object-fit: contain;
}

.qb-profile-panel {
  flex-shrink: 0;
}

.qb-avatar-frame {
  width: clamp(60px, 14vw, 92px);
  height: clamp(60px, 14vw, 92px);
  padding: 3px;
  box-sizing: border-box;
  border: 2px solid rgba(34, 211, 238, 0.95);
  border-radius: 4px;
  background: rgba(3, 7, 18, 0.65);
  box-shadow:
    0 0 16px rgba(34, 211, 238, 0.55),
    0 0 28px rgba(168, 85, 247, 0.22),
    inset 0 0 12px rgba(34, 211, 238, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.qb-avatar-wrap {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 2px;
}

.qb-avatar-img.lobby-avatar-mask {
  width: 151%;
  height: 212%;
  /* object-fit / object-position: match Main-Lobby .lobby-avatar-mask */
  transform: translate(0, 16px);
  display: block;
}

.qb-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(34, 211, 238, 0.45) rgba(0, 20, 40, 0.5);
}

.qb-main::-webkit-scrollbar {
  width: 8px;
}

.qb-main::-webkit-scrollbar-track {
  background: url(/Quiz-Battle/IMAGE/q-scroll-bg.png) center / 100% 100% no-repeat;
  border-radius: 4px;
}

.qb-main::-webkit-scrollbar-thumb {
  background: url(/Quiz-Battle/IMAGE/q-scroll-bar.png) center / 100% 100% no-repeat;
  border-radius: 4px;
}

.qb-room-banner {
  width: 100%;
  max-width: min(94vw, 640px);
  margin: 0 auto clamp(10px, 1.5vh, 18px);
  flex-shrink: 0;
}

@media (min-width: 1200px) {
  .qb-room-banner {
    max-width: min(92vw, 760px);
  }
}

@media (min-width: 1600px) {
  .qb-room-banner {
    max-width: min(88vw, 880px);
  }
}

.qb-room-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.35));
}

.qb-grid {
  width: 100%;
  max-width: min(96vw, 1040px);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: clamp(8px, 1.2vw, 18px);
  padding: clamp(8px, 1.2vw, 14px) clamp(6px, 1vw, 12px) clamp(14px, 2vh, 24px);
}

@media (min-width: 1200px) {
  .qb-grid {
    max-width: min(94vw, 1180px);
    gap: clamp(10px, 1vw, 20px);
  }
}

@media (min-width: 1600px) {
  .qb-grid {
    max-width: min(92vw, 1320px);
    gap: clamp(12px, 0.9vw, 22px);
  }
}

.qb-card {
  position: relative;
  padding: 0;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  transition: box-shadow 0.2s, transform 0.15s;
}

.qb-card:hover,
.qb-card:focus-visible {
  transform: translateY(-2px);
}

.qb-card:focus-visible {
  outline: 2px solid #22d3ee;
  outline-offset: 2px;
}

.qb-card--selected {
  box-shadow: 0 0 0 2px rgba(168, 85, 247, 0.9), 0 0 18px rgba(34, 211, 238, 0.45);
}

.qb-card-room {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.qb-card-tag {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: auto;
  pointer-events: none;
}

.qb-toast {
  text-align: center;
  font-size: clamp(0.88rem, 1.5vw, 1.05rem);
  color: rgba(248, 250, 252, 0.88);
  min-height: 1.2em;
  margin-top: 4px;
  flex-shrink: 0;
  padding: 0 8px 4px;
}

.qb-bottom {
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px 12px max(12px, env(safe-area-inset-bottom));
  z-index: 4;
}

.qb-start-btn {
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  filter: drop-shadow(0 4px 20px rgba(34, 211, 238, 0.35));
  transition: transform 0.15s, filter 0.2s;
}

.qb-start-btn:hover,
.qb-start-btn:focus-visible {
  transform: scale(1.04);
  filter: drop-shadow(0 6px 28px rgba(168, 85, 247, 0.45));
}

.qb-start-btn:focus-visible {
  outline: 2px solid #22d3ee;
  outline-offset: 4px;
}

.qb-start-btn:active {
  transform: scale(0.98);
}

.qb-start-btn img {
  display: block;
  width: auto;
  height: clamp(54px, 9vw, 96px);
  max-height: min(22vh, 120px);
  max-width: min(94vw, 440px);
  object-fit: contain;
}

@media (min-width: 1200px) {
  .qb-start-btn img {
    height: clamp(64px, 7.5vw, 104px);
    max-height: 128px;
    max-width: min(90vw, 520px);
  }
}

@media (max-width: 720px) {
  .qb-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 400px) {
  .qb-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}