:root {
  --bg-primary: #081425;
  --bg-secondary: #10243f;
  --panel-bg: rgba(12, 32, 58, 0.72);
  --panel-border: rgba(255, 255, 255, 0.14);
  --text-primary: #f5f8ff;
  --text-secondary: #c0cee4;
  --accent: #ff9b42;
  --accent-soft: #ffd7b0;
  --grid-bg: rgba(255, 255, 255, 0.1);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 12px 30px rgba(0, 0, 0, 0.18);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 16px;
  --board-gap: 12px;
  --board-padding: 12px;
  --board-size: min(88vw, 540px);
  --tile-size: calc((var(--board-size) - (var(--board-padding) * 2) - (var(--board-gap) * 3)) / 4);
  --font-main: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font-family: var(--font-main);
  color: var(--text-primary);
  background:
    radial-gradient(circle at top left, rgba(58, 110, 203, 0.32), transparent 35%),
    radial-gradient(circle at top right, rgba(255, 155, 66, 0.18), transparent 28%),
    linear-gradient(160deg, #06111f 0%, #0f2442 44%, #0b1730 100%);
  overflow-x: hidden;
}
button, input, textarea { font: inherit; }
button {
  border: 0;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}
button:hover { transform: translateY(-1px); }
button:active { transform: translateY(1px); }

.app-shell { width: min(1280px, 100%); margin: 0 auto; padding: 20px 18px 32px; }
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 28px;
  border-radius: var(--radius-xl);
  margin-bottom: 20px;
}
.eyebrow { margin: 0 0 8px; font-size: 0.9rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent-soft); }
.hero h1 { margin: 0; font-size: clamp(2rem, 4vw, 3.25rem); line-height: 1.05; }
.hero-desc { margin: 14px 0 0; max-width: 720px; color: var(--text-secondary); line-height: 1.65; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
.main-layout { display: grid; grid-template-columns: minmax(300px, 390px) minmax(0, 1fr); gap: 20px; align-items: start; }
.info-column, .game-column { display: grid; gap: 20px; }
.status-card, .route-card, .leaderboard-card, .game-panel, .rant-card { border-radius: var(--radius-xl); padding: 22px; }
.status-card h2, .route-card h2, .leaderboard-card h2, .game-panel h2, .rant-card h2 { margin: 0; font-size: 1.15rem; }
.score-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
.score-box { padding: 16px; border-radius: var(--radius-md); background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08); }
.score-label { display: block; color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 8px; }
.score-box strong { display: block; font-size: clamp(1.2rem, 2.6vw, 1.9rem); }
.control-row, .tips-row, .panel-title, .status-badges { display: flex; align-items: center; gap: 10px; }
.control-row { margin-top: 18px; }
.panel-title { justify-content: space-between; margin-bottom: 16px; }
.panel-hint { margin: 4px 0 0; font-size: 0.88rem; color: var(--text-secondary); }
.accent-btn, .ghost-btn { padding: 12px 18px; border-radius: 999px; font-weight: 700; }
.accent-btn { background: linear-gradient(135deg, #ffb15c, #ff8741); color: #1f160f; box-shadow: 0 10px 26px rgba(255,153,66,0.34); }
.ghost-btn { color: var(--text-primary); background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12); }
.ghost-btn[disabled] { cursor: not-allowed; opacity: 0.45; }
.badge { display: inline-flex; align-items: center; justify-content: center; min-height: 30px; padding: 6px 12px; border-radius: 999px; font-size: 0.8rem; color: var(--text-primary); background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.1); }
.badge.orange { color: #2a1600; background: linear-gradient(135deg, #ffd39d, #ff9b42); border-color: rgba(255,255,255,0.15); }
.badge.muted { color: var(--text-secondary); }
.career-path { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.career-item { padding: 12px 14px; border-radius: var(--radius-md); background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08); }
.career-item.active { border-color: rgba(255,173,92,0.7); box-shadow: inset 0 0 0 1px rgba(255,173,92,0.22); }
.career-item small { display: block; color: var(--text-secondary); margin-bottom: 4px; }
.leaderboard-list { display: grid; gap: 10px; }
.leaderboard-item { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 16px; border-radius: var(--radius-md); background: rgba(255,255,255,0.05); color: var(--text-secondary); }
.leaderboard-item strong { color: var(--text-primary); }
.game-board-wrapper { display: flex; justify-content: center; margin: 18px 0 16px; }
.game-board {
  position: relative;
  width: var(--board-size);
  height: var(--board-size);
  padding: var(--board-padding);
  border-radius: 30px;
  background: rgba(245,248,255,0.08);
  box-shadow: var(--shadow-lg);
  touch-action: none;
  user-select: none;
}
.board-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--board-gap); width: 100%; height: 100%; }
.grid-cell { border-radius: 18px; background: var(--grid-bg); }
.tile-layer { position: absolute; inset: var(--board-padding); }
.tile {
  position: absolute;
  width: var(--tile-size);
  height: var(--tile-size);
  border-radius: 18px;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 8px;
  font-weight: 800;
  box-shadow: 0 14px 26px rgba(0,0,0,0.15);
  transition: transform 0.16s ease-in-out;
  will-change: transform;
}
.tile-role { font-size: clamp(0.72rem, 1.75vw, 1.05rem); line-height: 1.2; }
.tile-new { animation: pop-in 0.24s ease; }
.tile-merged { animation: merge-bounce 0.28s ease; }
.tile-hidden { box-shadow: 0 0 28px rgba(255,211,82,0.9), 0 0 50px rgba(255,192,0,0.4); }
.tips-row { flex-wrap: wrap; justify-content: center; color: var(--text-secondary); font-size: 0.88rem; }
.rant-text { margin: 0; font-size: 1.08rem; line-height: 1.75; color: #fff4e8; min-height: 3.6em; }
.toast-hint { margin-top: 14px; color: var(--text-secondary); font-size: 0.9rem; }
.toast-container { position: fixed; right: 18px; bottom: 18px; display: grid; gap: 12px; z-index: 30; }
.toast { min-width: min(88vw, 340px); padding: 14px 16px; border-radius: 18px; background: rgba(9,22,40,0.88); border: 1px solid rgba(255,255,255,0.12); box-shadow: var(--shadow-md); color: var(--text-primary); animation: toast-in 0.28s ease; }
.toast strong { display: block; margin-bottom: 4px; }
.toast.achievement { border-color: rgba(255,185,105,0.55); }
.toast.rant { border-color: rgba(124,217,146,0.42); }
.value-tooltip { position: fixed; z-index: 50; padding: 8px 12px; border-radius: 999px; background: rgba(0,0,0,0.78); color: #fff; font-size: 0.82rem; pointer-events: none; transform: translate(-50%, -125%); white-space: nowrap; }
.modal-overlay { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; padding: 18px; background: rgba(2,8,18,0.64); z-index: 40; transition: opacity 0.2s ease; }
.modal-overlay.hidden { opacity: 0; pointer-events: none; }
.modal-card { position: relative; width: min(92vw, 560px); padding: 28px 24px; border-radius: 28px; box-shadow: var(--shadow-lg); }
.modal-card.large { width: min(96vw, 980px); }
.modal-close { position: absolute; top: 12px; right: 14px; width: 38px; height: 38px; border-radius: 50%; background: rgba(255,255,255,0.08); color: var(--text-primary); font-size: 1.6rem; line-height: 1; }
.modal-meta { display: grid; gap: 10px; margin: 18px 0; }
.modal-meta-item { padding: 14px 16px; border-radius: var(--radius-md); background: rgba(255,255,255,0.05); color: var(--text-secondary); }
.modal-meta-item strong { color: var(--text-primary); }
.achievements-layout { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 20px; }
.achievements-list, .achievements-board { display: grid; gap: 12px; }
.achievement-card { padding: 16px; border-radius: var(--radius-md); background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08); }
.achievement-card.unlocked { border-color: rgba(255,155,66,0.5); background: rgba(255,155,66,0.08); }
.achievement-card h3 { margin: 0 0 8px; font-size: 1rem; }
.achievement-card p, .achievement-card small { margin: 0; color: var(--text-secondary); line-height: 1.6; }
.achievement-time { margin-top: 10px; display: inline-flex; padding: 6px 10px; border-radius: 999px; background: rgba(255,255,255,0.07); color: var(--text-primary); }
.flash-gold { animation: gold-flash 0.8s ease; }
.game-over-card, .promotion-card, .hidden-card, .victory-card { display: grid; gap: 12px; }
.game-over-card h2, .promotion-card h2, .hidden-card h2, .victory-card h2 { margin: 0; font-size: 1.8rem; }
.game-over-card p, .promotion-card p, .hidden-card p, .victory-card p { margin: 0; color: var(--text-secondary); line-height: 1.75; }
.modal-action-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
#fx-canvas { position: fixed; inset: 0; width: 100vw; height: 100vh; pointer-events: none; z-index: 25; }
.tile-2 { background: linear-gradient(145deg, #f3f7ff, #dbe7ff); color: #173052; }
.tile-4 { background: linear-gradient(145deg, #e1f0ff, #bedcff); color: #14314f; }
.tile-8 { background: linear-gradient(145deg, #dff0ff, #9dd0ff); color: #11314f; }
.tile-16 { background: linear-gradient(145deg, #d4efff, #7db8ff); color: #11314f; }
.tile-32 { background: linear-gradient(145deg, #d3f4ff, #6fbbff); color: #103252; }
.tile-64 { background: linear-gradient(145deg, #ffefdc, #ffc28f); color: #54280c; }
.tile-128 { background: linear-gradient(145deg, #ffdca9, #ffaf59); color: #54280c; }
.tile-256 { background: linear-gradient(145deg, #ffc57a, #ff9652); color: #4a1f05; }
.tile-512 { background: linear-gradient(145deg, #ffaf55, #ff7f38); color: #441b04; }
.tile-1024 { background: linear-gradient(145deg, #ffe6a1, #ffbf3f); color: #4c3200; }
.tile-2048 { background: linear-gradient(145deg, #ffe89d, #ffe16a, #ffcb42); color: #4a3300; }
.tile-4096 { background: linear-gradient(145deg, #fff0a8, #ffd24d, #ffb800); color: #533700; }
@keyframes pop-in { 0% { opacity: 0; transform: scale(0.45); } 100% { opacity: 1; transform: scale(1); } }
@keyframes merge-bounce { 0% { transform: scale(0.78); } 60% { transform: scale(1.12); } 100% { transform: scale(1); } }
@keyframes toast-in { 0% { opacity: 0; transform: translateY(10px); } 100% { opacity: 1; transform: translateY(0); } }
@keyframes gold-flash { 0% { box-shadow: inset 0 0 0 0 rgba(255,214,74,0); } 40% { box-shadow: inset 0 0 0 2000px rgba(255,214,74,0.24); } 100% { box-shadow: inset 0 0 0 0 rgba(255,214,74,0); } }
@media (max-width: 980px) {
  :root { --board-size: min(92vw, 500px); }
  .main-layout { grid-template-columns: 1fr; }
  .achievements-layout { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  :root { --board-gap: 10px; --board-padding: 10px; --board-size: min(94vw, 460px); }
  .app-shell { padding: 16px 12px 24px; }
  .hero { padding: 22px 18px; flex-direction: column; }
  .hero-actions, .control-row, .panel-title, .status-badges { flex-wrap: wrap; }
  .status-card, .route-card, .leaderboard-card, .game-panel, .rant-card { padding: 18px; }
  .score-grid, .career-path { grid-template-columns: 1fr 1fr; }
  .tile { border-radius: 16px; }
}
@media (max-width: 520px) {
  :root { --board-gap: 8px; --board-padding: 8px; }
  .score-grid, .career-path { grid-template-columns: 1fr; }
  .modal-card { padding: 24px 18px 20px; }
  .toast-container { left: 12px; right: 12px; bottom: 12px; }
  .toast { min-width: auto; }
}
@media (orientation: landscape) and (max-height: 600px) {
  :root { --board-size: min(62vh, 430px); }
  .hero-desc { max-width: 100%; }
}