/* ============================================================
   数独库 · 设计系统 (Design Tokens)
   主题: 休息 + 科技 ——「晴空静谧」亮色
   基准画布: 720 × 1280 (手机竖屏, 9:16)
   目标引擎: Cocos Creator 3.x (UITransform + Widget)
   ============================================================ */

:root {
  /* ---------- 颜色 (亮色) ---------- */
  --c-bg:            #EEF3FA;            /* 晴空浅蓝底 */
  --c-bg-glow-1:     rgba(61,108,224,0.12);
  --c-bg-glow-2:     rgba(45,212,191,0.10);
  --c-surface:       #FFFFFF;            /* 卡片面 */
  --c-surface-2:     #EDF2F9;

  --c-primary:       #3D6CE0;            /* 靛蓝 (科技+静) */
  --c-primary-press: #2E54B8;
  --c-primary-soft:  rgba(61,108,224,0.12);
  --c-primary-glow:  rgba(61,108,224,0.35);

  --c-accent:        #FF9F1C;            /* 暖琥珀 */
  --c-accent-soft:   rgba(255,159,28,0.14);

  --c-text:          #1B2330;
  --c-text-2:        #5B6472;
  --c-text-3:        #9AA3B2;

  --c-line:          #E2E8F2;
  --c-line-strong:   #C3CCDA;

  /* 棋盘 */
  --c-board-bg:      #FFFFFF;
  --c-cell:          #FFFFFF;
  --c-cell-line:     #D7DEEA;
  --c-cell-line-thick: #97A2B6;
  --c-cell-selected: #CDE0FF;
  --c-cell-peer:     #EEF3FB;
  --c-cell-same:     #DBE7FF;
  --c-cell-conflict: #FFDFDF;
  --c-cell-conflict-text:#E5484D;
  --c-cell-fixed:    #1B2330;
  --c-cell-user:     #3D6CE0;
  --c-cell-note:     #8A94A6;

  --c-success:       #2BB673;
  --c-danger:        #E5484D;

  /* ---------- 字体 ---------- */
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC",
          "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --fs-display: 56px;
  --fs-title:   40px;
  --fs-sub:     32px;
  --fs-body:    28px;
  --fs-caption: 24px;
  --fs-mini:    20px;

  /* ---------- 间距 ---------- */
  --s-1: 8px;  --s-2: 16px; --s-3: 24px;
  --s-4: 32px; --s-5: 40px; --s-6: 48px;

  /* ---------- 圆角 ---------- */
  --r-sm: 12px; --r-md: 20px; --r-lg: 28px; --r-pill: 999px;

  /* ---------- 安全区 ---------- */
  --safe-top: 48px;
  --safe-bottom: 40px;

  /* ---------- 阴影/辉光 ---------- */
  --sh-card: 0 8px 24px rgba(27,39,66,0.10);
  --sh-float: 0 12px 32px rgba(27,39,66,0.16);
  --glow-soft: 0 0 24px var(--c-primary-glow);
}

/* ============================================================
   重置
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  color: var(--c-text);
  background: #D6DEEB;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}

/* ============================================================
   手机外框 + 画布
   ============================================================ */
.stage { width: 100vw; height: 100vh; display: flex; align-items: center; justify-content: center; }
.phone {
  position: relative; width: 720px; height: 1280px;
  border-radius: 44px; overflow: hidden; flex: none;
  box-shadow: 0 24px 60px rgba(27,39,66,0.25);
  background:
    radial-gradient(120% 80% at 50% -10%, var(--c-bg-glow-1), transparent 60%),
    radial-gradient(120% 90% at 100% 110%, var(--c-bg-glow-2), transparent 55%),
    linear-gradient(160deg, #F7FAFF 0%, var(--c-bg) 55%, #E7EEF8 100%);
}
.screen {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  padding-top: var(--safe-top); padding-bottom: var(--safe-bottom);
}

/* ============================================================
   状态栏
   ============================================================ */
.statusbar {
  height: 48px; flex: none;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--s-4); font-size: var(--fs-caption);
  font-weight: 600; color: var(--c-text);
}
.statusbar .sb-right { display: flex; gap: 12px; align-items: center; }

/* ============================================================
   导航栏
   ============================================================ */
.navbar { height: 96px; flex: none; display: flex; align-items: center; padding: 0 var(--s-3); gap: var(--s-2); }
.navbar .nav-title { font-size: var(--fs-title); font-weight: 700; flex: 1; text-align: center; }
.navbar .nav-btn {
  width: 64px; height: 64px; flex: none; display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-pill); background: var(--c-surface); box-shadow: var(--sh-card); font-size: var(--fs-sub);
}
.navbar .nav-btn.ghost { background: transparent; box-shadow: none; color: var(--c-text); }

/* ============================================================
   按钮
   ============================================================ */
.btn {
  height: 96px; border: none; border-radius: var(--r-md);
  font-size: var(--fs-sub); font-weight: 700; font-family: var(--font);
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  padding: 0 var(--s-4); cursor: pointer; transition: transform .08s ease, filter .15s ease;
}
.btn:active { transform: scale(0.97); }
.btn--primary { background: linear-gradient(135deg, var(--c-primary), #5B8DEF); color: #fff; box-shadow: var(--glow-soft); }
.btn--primary:active { filter: brightness(0.95); }
.btn--ghost { background: var(--c-surface); color: var(--c-text); box-shadow: var(--sh-card); }
.btn--soft { background: var(--c-primary-soft); color: var(--c-primary); }
.btn--block { width: 100%; }
.btn--sm { height: 72px; font-size: var(--fs-body); border-radius: var(--r-sm); }

.chip {
  display: inline-flex; align-items: center; gap: 8px; height: 56px; padding: 0 var(--s-3);
  border-radius: var(--r-pill); background: var(--c-surface-2); color: var(--c-text-2);
  font-size: var(--fs-caption); font-weight: 600;
}
.chip.active { background: var(--c-primary); color: #fff; }

.card { background: var(--c-surface); border-radius: var(--r-md); box-shadow: var(--sh-card); padding: var(--s-3); }

/* ============================================================
   数独棋盘 (9×9) —— 648×648, 单元格 72×72
   ============================================================ */
.sudoku-board {
  width: 648px; height: 648px; margin: 0 auto;
  background: var(--c-board-bg);
  border: 4px solid var(--c-cell-line-thick); border-radius: 8px;
  display: grid; grid-template-columns: repeat(9, 1fr); grid-template-rows: repeat(9, 1fr);
  overflow: hidden; user-select: none;
}
.cell {
  position: relative; display: flex; align-items: center; justify-content: center;
  border-right: 1px solid var(--c-cell-line); border-bottom: 1px solid var(--c-cell-line);
  background: var(--c-cell);
  font-size: 40px; font-weight: 600; color: var(--c-cell-user); cursor: pointer;
}
.cell:nth-child(9n) { border-right: none; }
.sudoku-board .cell:nth-last-child(-n+9) { border-bottom: none; }
.cell.box-right  { border-right: 3px solid var(--c-cell-line-thick); }
.cell.box-bottom { border-bottom: 3px solid var(--c-cell-line-thick); }

.cell.is-fixed    { color: var(--c-cell-fixed); font-weight: 800; }
.cell.is-user     { color: var(--c-cell-user); }
.cell.is-peer     { background: var(--c-cell-peer); }
.cell.is-same     { background: var(--c-cell-same); }
.cell.is-selected { background: var(--c-cell-selected); box-shadow: inset 0 0 0 2px var(--c-primary); }
.cell.is-conflict { background: var(--c-cell-conflict); color: var(--c-cell-conflict-text); }
.cell.is-hint     { color: var(--c-accent); }

.cell .num { line-height: 1; }
.cell .notes {
  position: absolute; inset: 4px; display: grid;
  grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr);
  font-size: 16px; color: var(--c-cell-note); font-weight: 500;
}
.cell .notes span { display: flex; align-items: center; justify-content: center; }

/* ============================================================
   数字键盘
   ============================================================ */
.keypad { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--s-2); padding: 0 var(--s-3); }
.key {
  height: 104px; display: flex; align-items: center; justify-content: center;
  background: var(--c-surface); border-radius: var(--r-md); box-shadow: var(--sh-card);
  font-size: var(--fs-sub); font-weight: 700; color: var(--c-primary); cursor: pointer;
}
.key:active { transform: scale(0.96); background: var(--c-primary-soft); }
.key.is-used { color: var(--c-text-3); }
.key--del { color: var(--c-danger); }
.key .key-count { font-size: var(--fs-mini); color: var(--c-text-3); margin-left: 6px; }

/* ============================================================
   工具行
   ============================================================ */
.toolbar { display: flex; justify-content: space-around; padding: var(--s-2) var(--s-3); }
.tool { display: flex; flex-direction: column; align-items: center; gap: 6px; font-size: var(--fs-mini); color: var(--c-text-2); background: none; border: none; cursor: pointer; }
.tool .ico { font-size: 36px; line-height: 1; }
.tool.active { color: var(--c-primary); }

/* ============================================================
   滚动 / 固定主体
   ============================================================ */
.body-scroll { flex: 1; overflow-y: auto; padding: var(--s-3); display: flex; flex-direction: column; gap: var(--s-3); }
.body-fixed { flex: 1; display: flex; flex-direction: column; padding: var(--s-3); gap: var(--s-3); }

.t-title { font-size: var(--fs-title); font-weight: 700; }
.t-sub { font-size: var(--fs-sub); font-weight: 600; }
.t-body { font-size: var(--fs-body); color: var(--c-text-2); }
.t-cap { font-size: var(--fs-caption); color: var(--c-text-3); }
.t-center { text-align: center; }
.muted { color: var(--c-text-3); }
.primary { color: var(--c-primary); }
.accent { color: var(--c-accent); }

/* ============================================================
   欢迎/启动界面专用
   ============================================================ */
.splash { flex: 1; display: flex; flex-direction: column; align-items: center; }
.splash-main { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--s-3); width: 100%; }
.logo-glow {
  width: 240px; height: 240px; border-radius: 50%;
  background: radial-gradient(circle, var(--c-primary-glow), transparent 70%);
  filter: blur(6px); animation: pulse 3.2s ease-in-out infinite;
  display: flex; align-items: center; justify-content: center;
}
@keyframes pulse { 0%,100% { transform: scale(1); opacity: .75; } 50% { transform: scale(1.12); opacity: 1; } }
.logo-mark {
  width: 168px; height: 168px; border-radius: 36px;
  background: linear-gradient(150deg, rgba(61,108,224,0.14), rgba(45,212,191,0.12));
  border: 1px solid rgba(27,39,66,0.08);
  display: grid; grid-template-columns: repeat(3,1fr); grid-template-rows: repeat(3,1fr);
  padding: 18px; gap: 10px;
}
.logo-mark i { border-radius: 8px; background: rgba(27,39,66,0.06); }
.logo-mark i.on { background: var(--c-primary); box-shadow: var(--glow-soft); }
.app-name { font-size: var(--fs-display); font-weight: 800; letter-spacing: 6px; }
.app-sub { font-size: var(--fs-caption); letter-spacing: 4px; color: var(--c-text-2); text-transform: uppercase; }

.splash-bottom { width: 100%; padding: 0 var(--s-5) var(--s-4); display: flex; flex-direction: column; align-items: center; gap: var(--s-3); }
.progress { width: 520px; max-width: 86%; }
.progress__track { height: 12px; border-radius: var(--r-pill); background: rgba(27,39,66,0.08); overflow: hidden; }
.progress__fill {
  height: 100%; width: 0%; border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  box-shadow: 0 0 16px var(--c-primary-glow); transition: width .2s ease;
}
.progress__label { display: flex; justify-content: space-between; margin-top: 14px; font-size: var(--fs-caption); color: var(--c-text-2); }
.copyright { font-size: var(--fs-mini); color: var(--c-text-3); text-align: center; letter-spacing: 1px; }

/* ============================================================
   难度选择界面专用
   ============================================================ */
.diff-list { display: flex; flex-direction: column; gap: var(--s-3); }
.diff-card {
  display: flex; align-items: center; gap: var(--s-3);
  background: var(--c-surface); border-radius: var(--r-md); padding: var(--s-3);
  border: 2px solid transparent; cursor: pointer; box-shadow: var(--sh-card);
  transition: border-color .15s ease, transform .08s ease;
}
.diff-card:active { transform: scale(0.99); }
.diff-card.active { border-color: var(--c-primary); background: linear-gradient(120deg, var(--c-primary-soft), transparent); }
.diff-card .dc-icon {
  width: 88px; height: 88px; flex: none; border-radius: 20px;
  display: flex; align-items: center; justify-content: center; font-size: 40px;
  background: var(--c-surface-2);
}
.diff-card.active .dc-icon { background: var(--c-primary); color: #fff; }
.diff-card .dc-main { flex: 1; }
.diff-card .dc-name { font-size: var(--fs-sub); font-weight: 700; }
.diff-card .dc-desc { font-size: var(--fs-caption); color: var(--c-text-2); margin-top: 4px; }
.diff-card .dc-stars { color: var(--c-accent); font-size: var(--fs-caption); letter-spacing: 2px; margin-top: 8px; }

/* ============================================================
   关卡选择界面专用
   ============================================================ */
.level-bar { display: flex; align-items: center; gap: var(--s-2); margin-bottom: var(--s-2); }
.level-bar .lb-label { font-size: var(--fs-caption); color: var(--c-text-2); }
.level-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-2); }
.lv-tile {
  aspect-ratio: 1 / 1; border-radius: var(--r-md); background: var(--c-surface);
  box-shadow: var(--sh-card); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 6px;
  position: relative; cursor: pointer; border: 2px solid transparent;
  transition: transform .08s ease, border-color .15s ease;
}
.lv-tile:active { transform: scale(0.97); }
.lv-tile.cleared { border-color: var(--c-primary-soft); }
.lv-tile.locked { cursor: default; opacity: .5; }
.lv-tile .lv-num { font-size: var(--fs-sub); font-weight: 800; color: var(--c-text); }
.lv-tile .lv-stars { font-size: var(--fs-mini); color: var(--c-accent); letter-spacing: 1px; }
.lv-tile .lv-lock { position: absolute; font-size: 36px; opacity: .8; }
.lv-tile .lv-best { font-size: var(--fs-mini); color: var(--c-text-2); }
.lv-tile .lv-record {
  position: absolute; top: 8px; right: 8px;
  font-size: 18px; font-weight: 700; line-height: 1;
  background: var(--c-accent); color: #3A2400;
  padding: 4px 8px; border-radius: var(--r-pill);
}

/* ============================================================
   作答/游戏界面专用
   ============================================================ */
.game-top { display: flex; align-items: center; justify-content: space-between; padding: var(--s-1) var(--s-3) var(--s-2); }
.timer { display: flex; align-items: center; gap: 10px; font-size: var(--fs-sub); font-weight: 700; }
.timer .ico { font-size: 34px; }
.game-info { font-size: var(--fs-caption); color: var(--c-text-2); }

.win-overlay {
  position: absolute; inset: 0; z-index: 20;
  background: rgba(8,12,20,0.72);
  display: flex; align-items: center; justify-content: center;
}
.win-card {
  width: 540px; background: var(--c-surface); border-radius: var(--r-lg);
  padding: var(--s-5); text-align: center; box-shadow: var(--sh-float);
}
.win-card .win-title { font-size: var(--fs-title); font-weight: 800; color: var(--c-primary); }
.win-card .win-time { font-size: var(--fs-display); font-weight: 800; margin: var(--s-3) 0 var(--s-4); }
.win-card .win-sub { font-size: var(--fs-caption); color: var(--c-text-2); margin-bottom: var(--s-4); }
.win-card .win-record { color: var(--c-accent); font-weight: 700; }

/* ============================================================
   作答界面 · 交互补充
   ============================================================ */
.key.disabled { opacity: .38; pointer-events: none; }
.cell .cand { position: absolute; font-size: 40px; font-weight: 600; color: var(--c-primary); opacity: .4; }
.cell.is-unique { box-shadow: inset 0 0 0 3px var(--c-primary); }

.pause-overlay {
  position: absolute; inset: 0; z-index: 30;
  background: rgba(238,243,250,0.72);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  display: flex; align-items: center; justify-content: center;
}
.pause-card {
  width: 520px; background: var(--c-surface); border-radius: var(--r-lg);
  padding: var(--s-5); text-align: center; box-shadow: var(--sh-float);
}
.pause-card .win-title { font-size: var(--fs-title); font-weight: 800; color: var(--c-primary); }
.pause-card .win-sub { font-size: var(--fs-caption); color: var(--c-text-2); margin: var(--s-2) 0 var(--s-4); }

/* ============================================================
   设置页面专用 (参照 iOS 风格列表)
   ============================================================ */
.settings-list { display: flex; flex-direction: column; }
.set-item {
  display: flex; align-items: center; padding: var(--s-3) var(--s-4);
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
  min-height: 112px;
}
.set-item:first-child { border-top-left-radius: var(--r-md); border-top-right-radius: var(--r-md); }
.set-item:last-child { border-bottom: none; border-bottom-left-radius: var(--r-md); border-bottom-right-radius: var(--r-md); }
.set-item .si-main { flex: 1; min-width: 0; }
.set-item .si-name { font-size: var(--fs-body); font-weight: 600; color: var(--c-text); }
.set-item .si-desc { font-size: var(--fs-mini); color: var(--c-text-3); margin-top: 6px; line-height: 1.35; }
.set-item .si-arrow { font-size: 28px; color: var(--c-text-3); margin-left: var(--s-2); }

/* iOS 风格开关 */
.switch {
  width: 100px; height: 60px; border-radius: 30px;
  position: relative; cursor: pointer; flex-shrink: 0;
  transition: background .25s ease;
  background: #E5E7EB;
}
.switch.on { background: linear-gradient(135deg, #5B8DEF, var(--c-primary)); box-shadow: var(--glow-soft); }
.switch::after {
  content: ''; width: 52px; height: 52px; border-radius: 50%;
  background: #fff; box-shadow: 0 3px 10px rgba(0,0,0,.18);
  position: absolute; top: 4px; left: 4px;
  transition: transform .22s ease;
}
.switch.on::after { transform: translateX(40px); }

.set-group-title {
  font-size: var(--fs-caption); color: var(--c-text-3);
  padding: var(--s-3) var(--s-4) var(--s-1);
}