:root {
  --bg: #0f0f1a;
  --panel: rgba(20, 20, 36, 0.9);
  --panel-strong: rgba(30, 30, 54, 0.96);
  --panel-soft: rgba(255, 255, 255, 0.04);
  --text: #f8fafc;
  --muted: #a1a1bf;
  --accent: #d71920;
  --accent-soft: rgba(215, 25, 32, 0.16);
  --accent-strong: #ff5a5f;
  --border: rgba(255, 255, 255, 0.1);
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Poppins", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(215, 25, 32, 0.2), transparent 28%),
    radial-gradient(circle at 80% 20%, rgba(56, 189, 248, 0.12), transparent 24%),
    linear-gradient(180deg, #0d1523 0%, #09111b 100%);
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: white;
  cursor: pointer;
  padding: 0.9rem 1.1rem;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 30px rgba(244, 63, 94, 0.28);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.ghost-button {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}

.danger-button {
  background: linear-gradient(135deg, #dc2626 0%, #f97316 100%);
}

.app-shell {
  width: min(1200px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: 1rem 0 2.5rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.brand {
  margin: 0;
  font-size: clamp(1.6rem, 2vw + 1rem, 2.8rem);
}

.eyebrow {
  margin: 0 0 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  color: var(--accent-strong);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.banner,
.config-panel,
.panel,
.hero,
.play-area,
.sidebar,
.card-list,
.leaderboard,
.summary-grid,
.group-column,
.lobby-column,
.stats-grid .stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.config-panel {
  padding: 1rem;
  margin-bottom: 1rem;
}

.banner {
  padding: 0.9rem 1rem;
  margin-bottom: 1rem;
  color: #fff7ed;
  background: rgba(180, 83, 9, 0.3);
}

.hidden {
  display: none !important;
}

.app-view {
  animation: fade-in 260ms ease;
}

.hero {
  display: grid;
  gap: 1rem;
  padding: 1.3rem;
}

.hero-grid,
.lobby-grid,
.game-grid,
.end-grid,
.dual-grid,
.stats-grid {
  display: grid;
  gap: 1rem;
}

.hero-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card-hero {
  min-height: 240px;
  position: relative;
  overflow: hidden;
}

.card-hero::before,
.card-hero::after {
  content: "";
  position: absolute;
  border-radius: 22px;
  inset: auto;
}

.card-hero::before {
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(244, 63, 94, 0.45), transparent 65%);
  top: -2rem;
  right: -1rem;
}

.card-hero::after {
  width: 130px;
  height: 130px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.28), transparent 70%);
  bottom: -1.5rem;
  left: -1rem;
}

.mini-cards {
  display: grid;
  gap: 0.85rem;
  position: relative;
  z-index: 1;
}

.mini-card {
  min-height: 82px;
  border-radius: 18px;
  padding: 1rem;
  display: grid;
  gap: 0.35rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transform: rotate(var(--tilt, 0deg));
}

.mini-card:nth-child(2) {
  --tilt: -3deg;
}

.mini-card:nth-child(3) {
  --tilt: 2deg;
}

.headline {
  font-size: clamp(2rem, 5vw, 4.4rem);
  line-height: 1;
  margin: 0;
}

.subhead,
.muted {
  color: var(--muted);
}

.screen-panel,
.panel {
  padding: 1.2rem;
}

.dual-grid,
.lobby-grid,
.game-grid,
.end-grid {
  grid-template-columns: 1fr;
}

.screen-actions,
.inline-actions,
.pill-row,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.field,
.checkbox-field {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 0.95rem;
}

.field span,
.field label {
  font-size: 0.92rem;
  color: var(--muted);
}

input,
textarea,
select {
  width: 100%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 0.9rem 1rem;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.checkbox-field {
  grid-template-columns: auto 1fr;
  align-items: center;
}

.checkbox-field input {
  width: auto;
  margin: 0;
}

.status-chip,
.session-chip,
.avatar-badge,
.toast,
.player-chip,
.team-pill,
.score-pill {
  border-radius: 999px;
}

.session-chip,
.status-chip,
.score-pill {
  padding: 0.45rem 0.8rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
}

.stats-grid {
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.stat-card {
  padding: 1rem;
}

.stat-value {
  margin: 0.2rem 0 0;
  font-size: 1.55rem;
  font-weight: 800;
}

.list {
  display: grid;
  gap: 0.7rem;
}

.list-item,
.leaderboard-row,
.card-entry,
.summary-card,
.group-member,
.turn-row {
  display: grid;
  gap: 0.35rem;
  padding: 0.95rem 1rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.player-row,
.leaderboard-row,
.turn-row,
.group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.player-meta,
.leaderboard-meta,
.group-meta {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  min-width: 0;
}

.avatar-badge {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.06);
}

.leaderboard {
  padding: 1.1rem;
}

.score-number {
  font-size: 1.2rem;
  font-weight: 800;
}

.leaderboard-row.is-active,
.turn-row.is-active,
.group-column.is-active,
.player-chip.is-active {
  border-color: rgba(244, 63, 94, 0.55);
  box-shadow: 0 0 0 1px rgba(244, 63, 94, 0.28), 0 18px 40px rgba(244, 63, 94, 0.15);
}

.play-area {
  padding: 1rem;
}

.progress-track {
  position: relative;
  width: 100%;
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #38bdf8);
}

.flashcard-shell {
  perspective: 1400px;
  margin: 1rem 0 1.2rem;
}

.flashcard {
  position: relative;
  min-height: 360px;
  transform-style: preserve-3d;
  transition: transform 760ms cubic-bezier(0.22, 1, 0.36, 1);
}

.flashcard.is-revealed {
  transform: rotateY(180deg);
}

.flash-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem;
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(215, 25, 32, 0.22), rgba(56, 189, 248, 0.08)),
    rgba(21, 21, 38, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backface-visibility: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
}

.flash-face.back {
  transform: rotateY(180deg);
}

.flash-face h3 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.7rem);
}

.card-label {
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.75rem;
  margin: 0;
}

.hint-text {
  margin: 0;
  color: var(--muted);
}

.turn-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.timer-pill {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  font-weight: 700;
}

.timer-pill.warning {
  background: rgba(245, 158, 11, 0.16);
  color: #fde68a;
}

.toast-root {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  display: grid;
  gap: 0.75rem;
  width: min(320px, calc(100% - 2rem));
  z-index: 30;
}

.toast {
  padding: 0.85rem 1rem;
  background: rgba(15, 15, 26, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  animation: toast-in 220ms ease;
}

.toast.success {
  border-color: rgba(34, 197, 94, 0.5);
}

.toast.warning {
  border-color: rgba(245, 158, 11, 0.45);
}

.toast.error {
  border-color: rgba(239, 68, 68, 0.45);
}

.group-board,
.turn-order-board,
.cards-board {
  display: grid;
  gap: 1rem;
}

.group-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.group-column {
  padding: 1rem;
  min-height: 180px;
}

.dropzone {
  display: grid;
  gap: 0.65rem;
  min-height: 80px;
}

.dropzone.is-over {
  outline: 2px dashed rgba(244, 63, 94, 0.65);
  outline-offset: 6px;
}

.player-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  cursor: grab;
}

.summary-grid {
  padding: 1rem;
  display: grid;
  gap: 0.85rem;
}

.confetti {
  position: relative;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  top: -14px;
  width: 10px;
  height: 20px;
  border-radius: 999px;
  opacity: 0.85;
  animation: confetti-fall linear forwards;
}

.connection-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--success);
}

.connection-dot.offline {
  background: var(--warning);
}

.empty-state {
  padding: 1.1rem;
  border-radius: 18px;
  border: 1px dashed rgba(255, 255, 255, 0.14);
  color: var(--muted);
  text-align: center;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes confetti-fall {
  to {
    transform: translate3d(var(--drift, 0px), 120vh, 0) rotate(520deg);
    opacity: 0;
  }
}

@media (min-width: 900px) {
  .dual-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  }

  .lobby-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(330px, 0.7fr);
  }

  .game-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
    align-items: start;
  }

  .end-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }
}