:root {
  --bg: #08111d;
  --bg-2: #0d1b2a;
  --panel: #122338;
  --card: #172d49;
  --line: #284768;
  --text: #e6f0ff;
  --muted: #9bb5d8;
  --accent: #5fe3ff;
  --accent-2: #52ffa8;
  --danger: #ff6b8b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at 15% 0%, #173052 0%, var(--bg) 45%, #060d18 100%);
  color: var(--text);
  font-family: "Segoe UI", Arial, sans-serif;
}

.page {
  width: min(1080px, calc(100% - 32px));
  margin: 20px auto 48px;
}

.hero {
  border: 1px solid var(--line);
  background: linear-gradient(160deg, #10243c, #0b1a2d 70%);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}

.hero-banner {
  width: 100%;
  height: clamp(220px, 35vw, 420px);
  object-fit: cover;
  display: block;
}

.hero-copy {
  padding: 18px;
}

.hero-copy h1 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 2.6vw, 2.2rem);
}

.hero-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.panel {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(13, 27, 42, 0.85);
  padding: 18px;
}

.panel h2 {
  margin: 0 0 14px;
}

.oauth-row {
  margin-bottom: 12px;
}

.oauth-btn {
  width: 100%;
  background: #ffffff;
  color: #10243c;
  border: 1px solid #b5cce8;
}

.oauth-btn:hover {
  background: #f2f7ff;
}
.auth-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.card h3 {
  margin: 0 0 4px;
}

label {
  color: var(--muted);
  font-size: 0.9rem;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0e1f33;
  color: var(--text);
  padding: 10px;
  outline: none;
}

input:focus {
  border-color: var(--accent);
}

button {
  border: 0;
  border-radius: 9px;
  padding: 10px 12px;
  font-weight: 600;
  color: #041523;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  cursor: pointer;
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

.user-bar {
  margin-bottom: 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #112641;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 14px;
  align-items: center;
}

.muted {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.wallet {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.wallet strong {
  font-size: 1.6rem;
  color: var(--accent);
}

.user-actions {
  display: flex;
  gap: 8px;
}

.ghost-btn {
  background: #193253;
  color: #d8e9ff;
  border: 1px solid #325882;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.game-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.game-card h3 {
  margin: 0;
}

.game-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.game-card .cost {
  color: #d4f8ff;
  font-weight: 600;
}

.flash {
  margin-top: 12px;
  border-radius: 10px;
  border: 1px solid #284768;
  background: #0f2741;
  color: #d8ecff;
  padding: 10px 12px;
}

.flash.error {
  border-color: #7b2a43;
  background: #2d1321;
  color: #ffc5d4;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 1000;
}

.modal-card {
  width: min(900px, 100%);
  max-height: 90vh;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #0b1828;
  padding: 14px;
}

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

.modal-header h3 {
  margin: 0;
}

.close-btn {
  background: #1f3b5e;
  color: #d8ecff;
  border: 1px solid #345d88;
}

.modal-body {
  padding-bottom: 10px;
}

.othello-wrap {
  display: grid;
  gap: 10px;
}

.othello-status {
  color: var(--muted);
}

.othello-board {
  width: fit-content;
  display: grid;
  grid-template-columns: repeat(8, 38px);
  gap: 4px;
  background: #0a1a2c;
  padding: 8px;
  border-radius: 10px;
  border: 1px solid var(--line);
}

.othello-cell {
  width: 38px;
  height: 38px;
  border: 1px solid #294b6e;
  border-radius: 6px;
  background: #12314f;
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
}

.othello-cell.valid {
  outline: 2px solid #6ee7ff;
}

.disk {
  width: 24px;
  height: 24px;
  border-radius: 50%;
}

.disk.black {
  background: #111;
}

.disk.white {
  background: #f2f2f2;
}

.invader-wrap {
  display: grid;
  gap: 10px;
}

.invader-info {
  color: var(--muted);
}

#invaderCanvas {
  width: min(100%, 760px);
  max-width: 760px;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #02080f;
}

.mobile-controls {
  display: flex;
  gap: 8px;
}

.mobile-controls button {
  min-width: 72px;
}

.memory-wrap {
  display: grid;
  gap: 10px;
}

.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.memory-card {
  padding: 14px 0;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #10304f;
  color: #dff7ff;
  font-size: 1.1rem;
}

.memory-card.matched {
  background: #1d6146;
  border-color: #348f6a;
}

@media (max-width: 980px) {
  .game-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .page {
    width: min(1080px, calc(100% - 20px));
    margin-top: 10px;
  }

  .auth-grid,
  .game-grid {
    grid-template-columns: 1fr;
  }

  .user-bar {
    grid-template-columns: 1fr;
  }

  .wallet {
    align-items: flex-start;
  }

  .othello-board {
    grid-template-columns: repeat(8, 32px);
  }

  .othello-cell {
    width: 32px;
    height: 32px;
  }

  .disk {
    width: 20px;
    height: 20px;
  }
}