/* 拼拼中国 —— 样式 */
:root {
  --bg1: #eaf4ff;
  --bg2: #fdf3e7;
  --ink: #2b3a4a;
  --ink-soft: #6b7c8d;
  --card: #ffffff;
  --line: #d7e2ec;
  --accent: #5b9be8;
  --accent-dark: #3f7fcf;
  --shadow: 0 6px 20px rgba(40, 70, 110, 0.12);
  --radius: 16px;
}

* { box-sizing: border-box; }

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui,
               "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", sans-serif;
  color: var(--ink);
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  -webkit-user-select: none;
  user-select: none;
  overflow-x: hidden;
}

#app { height: 100vh; height: 100dvh; overflow: hidden; display: flex; flex-direction: column; }
.hidden { display: none !important; }

/* ---------- 顶部栏 ---------- */
#topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
  flex-wrap: wrap;
}
.brand { font-size: 20px; font-weight: 800; }
#stats { display: flex; gap: 10px; flex: 1; flex-wrap: wrap; }
.stat {
  background: #eef5fc;
  color: var(--accent-dark);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 14px;
  font-weight: 600;
}
.actions { display: flex; gap: 8px; }

.btn {
  border: none;
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.15s;
}
.btn:active { transform: scale(0.95); }
.btn-ghost { background: #eef5fc; color: var(--accent-dark); }
.btn-ghost:hover { background: #dcebfb; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--accent-dark); }

/* ---------- 游戏区 ---------- */
#game {
  flex: 1;
  min-height: 0;
  display: flex;
  gap: 16px;
  padding: 16px;
  align-items: stretch;
}
#board-wrap {
  flex: 1;
  min-width: 0;
  min-height: 0;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
#board {
  width: 100%;
  height: 100%;
  touch-action: none;
}

#tray-wrap {
  width: 270px;
  flex-shrink: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px;
}
#tray-hint {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 10px;
  text-align: center;
  line-height: 1.4;
}
#tray {
  flex: 1;
  overflow-y: auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  align-content: start;
}

/* 托盘拼块 */
.piece {
  background: #f7fafd;
  border: 2px solid var(--line);
  border-radius: 12px;
  padding: 8px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  cursor: grab;
  transition: transform 0.1s, box-shadow 0.15s, border-color 0.15s;
}
.piece:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-2px); }
.piece.dragging { opacity: 0.35; }
.piece-svg { width: 100%; height: 64px; overflow: visible; }
.piece-path { stroke: #fff; stroke-width: 0.8; stroke-linejoin: round; }
.piece-name { font-size: 15px; font-weight: 700; }
.piece-pinyin { font-size: 11px; color: var(--ink-soft); }

/* 拖动浮层 */
.drag-clone {
  position: fixed;
  z-index: 1000;
  pointer-events: none;
  overflow: visible;
  filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.25));
  left: 0; top: 0;
}
.drag-clone .piece-path { stroke: #fff; stroke-width: 1.2; }
.drag-clone.miss { animation: shake 0.3s; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-7px) rotate(-4deg); }
  75% { transform: translateX(7px) rotate(4deg); }
}

/* ---------- 棋盘图层 ---------- */
.slot {
  fill: #e7edf3;
  stroke: #c4d2df;
  stroke-width: 1;
  stroke-linejoin: round;
}
.slot-active {
  fill: #fff3d6;
  stroke: #f4b942;
  stroke-width: 1.6;
  animation: glow 1.4s ease-in-out infinite;
}
@keyframes glow {
  0%, 100% { fill: #fff3d6; }
  50% { fill: #ffe7a8; }
}
.slot-done { opacity: 0; }
/* 困难档：国界外框剑影（同色填充+同色描边，缝合省界内线，叠成整块国土轮廓） */
.silhouette {
  fill: #e4ebf2;
  stroke: #e4ebf2;
  stroke-width: 0.75;
  stroke-linejoin: round;
}
/* 分省：仅一条省最外轮廓作参考框 */
.province-outline {
  fill: #eef3f8;
  stroke: #aebfce;
  stroke-width: 1.6;
  stroke-linejoin: round;
}
.slot-name {
  font-size: 13px;
  fill: #9aa9b8;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
}
.placed {
  stroke: #ffffff;
  stroke-width: 1.2;
  stroke-linejoin: round;
}
.placed.pop { animation: pop 0.45s ease-out; transform-box: fill-box; transform-origin: center; }
@keyframes pop {
  0% { transform: scale(0.6); opacity: 0.2; }
  60% { transform: scale(1.12); opacity: 1; }
  100% { transform: scale(1); }
}

/* 南海诸岛装饰 */
.nanhai-box { fill: #f1f6fb; stroke: #c4d2df; stroke-width: 1.2; rx: 6; }
.nanhai-path { fill: #d7e3ef; stroke: #b7c7d6; stroke-width: 0.6; }
.nanhai-label { font-size: 11px; fill: #8a99a8; text-anchor: middle; }

/* ---------- 开始 / 选玩法 / 选难度 / 选省份 ---------- */
.screen {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 30px 18px;
  gap: 6px;
  position: relative;
}
.screen h1 { font-size: 40px; margin: 0; }
.subtitle { color: var(--ink-soft); font-size: 16px; margin: 4px 0 18px; }
.tip { color: var(--ink-soft); font-size: 13px; margin-top: 18px; }

/* 返回按钮（选难度 / 选省份左上角） */
.screen-back { position: absolute; top: 18px; left: 18px; }

#difficulty-cards,
#mode-cards {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
}

/* 玩法卡（首页两张，略宽） */
.mode-card { width: 260px; }
.mode-national:hover { border-color: #ec7d7d; }
.mode-province:hover { border-color: #8bc34a; }

/* 省份选择网格 */
#province-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 14px;
  width: 100%;
  max-width: 720px;
}
.prov-card {
  background: var(--card);
  border: 3px solid transparent;
  border-radius: 16px;
  padding: 18px 10px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.12s, border-color 0.15s;
  font-family: inherit;
  color: inherit;
}
.prov-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.prov-name { font-size: 22px; font-weight: 800; }
.prov-count { font-size: 12px; color: var(--ink-soft); margin-top: 4px; }
.diff-card {
  width: 220px;
  background: var(--card);
  border: 3px solid transparent;
  border-radius: 20px;
  padding: 22px 18px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.12s, border-color 0.15s;
  text-align: center;
  font-family: inherit;
  color: inherit;
}
.diff-card:hover { transform: translateY(-6px); }
.diff-easy:hover { border-color: #4cc1a1; }
.diff-medium:hover { border-color: #5b9be8; }
.diff-hard:hover { border-color: #ec7d7d; }
.diff-emoji { font-size: 48px; }

/* 国旗 SVG：随容器字号缩放，固定 3:2 比例，替代不可渲染的国旗 emoji */
.cn-flag {
  display: inline-block;
  height: 1em;          /* 在 .diff-emoji(font-size:48px) 中即 48px；文案中即正文字号 */
  width: auto;
  aspect-ratio: 3 / 2;
  vertical-align: -0.15em;
  border-radius: 2px;
}
.diff-emoji .cn-flag { vertical-align: middle; }  /* 大卡片图标垂直居中 */
.diff-label { font-size: 24px; font-weight: 800; margin-top: 4px; }
.diff-age { font-size: 13px; color: var(--accent-dark); font-weight: 600; margin: 4px 0 10px; }
.diff-desc { font-size: 13px; color: var(--ink-soft); line-height: 1.5; }

/* ---------- 通关 ---------- */
#win-screen {
  position: fixed;
  inset: 0;
  background: rgba(20, 40, 70, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}
.win-card {
  background: #fff;
  border-radius: 24px;
  padding: 32px 36px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 420px;
  animation: pop 0.4s ease-out;
}
.win-emoji { font-size: 64px; }
.win-card h2 { margin: 6px 0 12px; font-size: 26px; }
.win-line { color: var(--ink-soft); }
.win-metrics { display: flex; gap: 18px; justify-content: center; margin: 14px 0; font-weight: 700; }
.win-actions { display: flex; gap: 12px; justify-content: center; margin-top: 18px; }

/* 彩屑 */
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 90; overflow: hidden; }
.confetti i {
  position: absolute;
  top: -20px;
  width: 10px;
  height: 14px;
  border-radius: 2px;
  animation: fall 2.4s linear forwards;
}
@keyframes fall {
  to { transform: translateY(105vh) rotate(540deg); opacity: 0.9; }
}

/* ---------- 响应式：窄屏把托盘移到下方 ---------- */
@media (max-width: 820px) {
  #game { flex-direction: column; }
  #board-wrap { flex: 1; }
  #tray-wrap { width: 100%; height: 34vh; flex: none; flex-shrink: 0; }
  #tray { grid-template-columns: repeat(4, 1fr); }
  #difficulty-cards { gap: 12px; }
  .diff-card { width: 88%; max-width: 320px; }
}