:root {
  --bg-top: #0a1022;
  --bg-mid: #1d2c52;
  --bg-bot: #12233e;
  --panel: rgba(10, 19, 40, 0.82);
  --text: #f5f8ff;
  --muted: #b8c4e3;
  --accent: #f2c84b;
  --accent-2: #6ce0ff;
  --good: #9ef28f;
  --danger: #ff8f8f;
  --border: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Sora", sans-serif;
  color: var(--text);
  background: linear-gradient(165deg, var(--bg-top) 0%, var(--bg-mid) 50%, var(--bg-bot) 100%);
  overflow-x: hidden;
}

.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.4;
  pointer-events: none;
}

.orb-a {
  width: 340px;
  height: 340px;
  background: #4ec5ff;
  top: -100px;
  left: -90px;
}

.orb-b {
  width: 380px;
  height: 380px;
  background: #ffd36a;
  right: -120px;
  bottom: -140px;
}

.app-shell {
  position: relative;
  display: grid;
  grid-template-columns: 360px minmax(300px, 1fr);
  gap: 18px;
  max-width: 1200px;
  margin: 30px auto;
  padding: 16px;
}

.main-menu,
.manage-shell,
.tips-shell {
  max-width: 980px;
  margin: 30px auto;
  padding: 16px;
}

.view {
  display: none;
}

.view.active {
  display: grid;
}

.main-menu.view.active,
.manage-shell.view.active,
.tips-shell.view.active {
  display: block;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px;
  backdrop-filter: blur(6px);
  animation: rise 0.6s ease both;
}

@keyframes rise {
  from {
    transform: translateY(16px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

h1,
h2 {
  margin: 0;
  font-family: "Bebas Neue", sans-serif;
  letter-spacing: 0.04em;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

.subtitle {
  color: var(--muted);
  margin: 6px 0 16px;
  line-height: 1.4;
}

.menu-panel {
  padding: 24px;
}

.menu-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.menu-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  text-align: left;
  padding: 16px;
  color: var(--text);
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.03));
  cursor: pointer;
  transition: transform 0.16s ease, border-color 0.2s ease;
}

.menu-card:hover {
  transform: translateY(-2px);
  border-color: rgba(242, 200, 75, 0.7);
}

.menu-card-title {
  display: block;
  font-family: "Bebas Neue", sans-serif;
  font-size: 1.6rem;
  margin-bottom: 6px;
}

.menu-card-copy {
  display: block;
  color: var(--muted);
  line-height: 1.35;
}

.section-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.field {
  margin-bottom: 12px;
}

label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: var(--muted);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  padding: 10px;
  font-family: inherit;
}

.btn {
  width: 100%;
  padding: 11px 12px;
  border: 0;
  border-radius: 12px;
  color: #0d1631;
  font-weight: 800;
  cursor: pointer;
  background: linear-gradient(120deg, var(--accent), #ffe49e);
  transition: transform 0.12s ease, filter 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.btn.small {
  width: auto;
  padding: 8px 12px;
  font-size: 0.82rem;
}

.btn.ghost {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text);
}

.btn.accent {
  margin-top: 12px;
  background: linear-gradient(120deg, var(--accent-2), #aef0ff);
}

.session-status,
.status-line,
.result {
  margin-top: 10px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.15);
  color: var(--muted);
  font-size: 0.9rem;
}

hr {
  border-color: var(--border);
  opacity: 0.5;
  margin: 16px 0;
}

.screenshot-wrap {
  margin-top: 8px;
  min-height: 140px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

#screenshotPreview {
  max-width: 100%;
  max-height: 200px;
  display: none;
}

.board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.palette {
  margin: 12px 0;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
}

.palette button {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 4px;
  cursor: pointer;
}

.palette-piece {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
}

.palette-piece-symbol {
  font-size: 1.2rem;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 6px;
}

.palette-piece-side {
  font-size: 0.56rem;
  letter-spacing: 0.04em;
  font-weight: 700;
  border-radius: 999px;
  padding: 2px 6px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
}

.palette-piece.side-white .palette-piece-side {
  background: rgba(255, 249, 223, 0.22);
}

.palette-piece.side-black .palette-piece-side {
  background: rgba(119, 205, 255, 0.2);
}

.palette button.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(242, 200, 75, 0.28);
}

.board-wrap {
  display: flex;
  justify-content: center;
}

.board {
  width: min(72vw, 520px);
  aspect-ratio: 1;
  border-radius: 14px;
  overflow: hidden;
  border: 3px solid rgba(255, 255, 255, 0.2);
  display: grid;
  grid-template-columns: repeat(8, 1fr);
}

.square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  cursor: pointer;
  transition: filter 0.15s ease;
}

.piece {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(20px, 3vw, 38px);
  line-height: 1;
  padding: 2px 5px;
  border-radius: 8px;
}

.piece-white {
  color: #fffef6;
  background: rgba(8, 14, 30, 0.28);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.65), 0 0 2px rgba(0, 0, 0, 0.55);
}

.piece-black {
  color: #101827;
  background: rgba(255, 255, 255, 0.34);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.65);
}

.piece-side-badge {
  position: absolute;
  top: 3px;
  right: 3px;
  min-width: 38px;
  text-align: center;
  padding: 1px 4px;
  border-radius: 999px;
  font-size: 0.5rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.piece-side-badge.side-white {
  color: #102133;
  background: rgba(255, 248, 210, 0.9);
}

.piece-side-badge.side-black {
  color: #eef7ff;
  background: rgba(8, 22, 40, 0.82);
}

.square.light {
  background: #f0d8a8;
}

.square.dark {
  background: #9e7242;
}

.square:hover {
  filter: brightness(1.1);
}

.fen-box {
  margin-top: 12px;
}

.result {
  margin-top: 10px;
  min-height: 50px;
}

.result.good {
  color: var(--good);
}

.result.bad {
  color: var(--danger);
}

.games-list {
  display: grid;
  gap: 10px;
}

.game-row {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.04);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

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

.btn.danger {
  background: linear-gradient(120deg, #ff8f8f, #ffc2c2);
}

.game-meta {
  min-width: 0;
}

.game-name {
  font-weight: 700;
}

.game-details {
  color: var(--muted);
  font-size: 0.85rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tips-list {
  display: grid;
  gap: 10px;
}

.tip-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.04);
}

.tip-item h3 {
  margin: 0 0 6px;
  font-family: "Bebas Neue", sans-serif;
  letter-spacing: 0.03em;
  font-size: 1.3rem;
}

.tip-item p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 960px) {
  .menu-grid {
    grid-template-columns: 1fr;
  }

  .app-shell {
    grid-template-columns: 1fr;
  }

  .panel-session {
    order: 2;
  }

  .panel-board {
    order: 1;
  }
}