/* =====================================================================
 * style.css — 外觀與排版
 * 手機優先：預設為單欄；寬度 900px 以上切換成左右兩欄。
 * ===================================================================== */
:root {
  --bg: #F5F3EC;
  --card: #FFFFFF;
  --text: #2C2C2A;
  --text-2: #5F5E5A;
  --line: #E2DFD5;
  /* ======== ★ 顏色設定區（改顏色只需要改這裡） ======== */
  /* 力箭頭 */
  --push-arrow: #46CCCC;        /* 推力箭頭 */
  --friction-arrow: #ffc76c;    /* 摩擦力箭頭 */
  /* 數值卡 */
  --push-text: #000000;         /* 推力數值卡文字 */
  --push-bg: #FFFFFF;           /* 推力數值卡背景 */
  --friction-text: #000000;     /* 摩擦力數值卡文字 */
  --friction-bg: #FFFFFF;       /* 摩擦力數值卡背景 */
  /* 結果顯示卡 */
  --static-bg: #F75757;   --static-text: #FFFFFF;     /* 推不動 */
  --critical-bg: #FF9f19; --critical-text: #FFFFFF;   /* 快動了（文字原指定 #46CCCK，待確認） */
  --sliding-bg: #13bf6a;  --sliding-text: #FFFFFF;    /* 推動了 */
  /* 按鈕 */
  --ctl: #2D66E9;               /* 控制區按鈕、刻度按鈕、說明按鈕 */


  /* ==================================================== */
  --danger: #A32D2D; --danger-bg: #FCEBEB;
  --radius: 10px;
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  color: var(--text);
  -webkit-text-size-adjust: 100%;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); }
body { min-height: 100vh; padding-bottom: env(safe-area-inset-bottom); }
button { font: inherit; color: inherit; cursor: pointer; -webkit-tap-highlight-color: transparent; }
button:disabled { cursor: not-allowed; }
[hidden] { display: none !important; }

/* ---------- 標題列 ---------- */
.site-header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  max-width: 1760px; margin: 0 auto; padding: 12px 16px 4px;
}
.site-header h1 { font-size: 18px; font-weight: 700; margin: 0; line-height: 1.35; color: #FFFFFF; transform: translateY(9px);}
.help-btn {
  flex: none; width: 34px; height: 34px; border-radius: 50%;
  border: 1.5px solid var(--ctl); background: var(--card); color: var(--ctl);
  font-weight: 700; font-size: 17px;
}

/* ---------- 版面 ----------
 * 手機：單欄，依序為 動畫 → 控制區 → 紀錄
 * 電腦（900px 以上）：左欄動畫、右上控制區、右下紀錄，整頁剛好一個螢幕高
 */
.layout { max-width: 1760px; margin: 0 auto; padding: 8px 12px 16px; display: grid; gap: 12px; grid-template-columns: minmax(0, 1fr); }
.layout > * { min-width: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px; }
.site-header, .site-footer { max-width: 1760px; }

/* ---------- 模擬畫面 ----------
 * --vr：畫面寬 ÷ 可見高度（由 animation.js 依 cropTop 設定，預設 2）
 * 人物、箱子、箭頭在 .canvas 裡，維持 800:500；天空與地面鋪滿整個畫面。
 */
.stage {
  position: relative; overflow: hidden; border-radius: var(--radius);
  aspect-ratio: var(--vr, 2); background: #EAF2F8;
  --scroll: 0px;
  --ground-h: calc(100% * var(--vr, 2) * var(--gr, 0.0625));   /* 地面高度由 config 的 groundY 決定 */
}
.canvas { position: absolute; left: 0; right: 0; bottom: 0; aspect-ratio: 800 / 500; }
.layer { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; user-select: none; }

/* 電腦版：動畫填滿左欄。畫面變寬或變高時，人物與箱子等比例縮放並置中 */
@supports (container-type: size) {
  @media (min-width: 900px) {
    .stage {
      aspect-ratio: auto; flex: 1 1 0; min-height: 200px;
      container-type: size;
      --cw: min(100cqw, calc(100cqh * var(--vr, 2)));   /* 圖片實際顯示寬度 */
      --ground-h: calc(var(--cw) * var(--gr, 0.0625));
    }
    .canvas { left: 50%; right: auto; width: var(--cw); transform: translateX(-50%); }
  }
}

/* 背景：天空＋遠處的距離標樁（捲動時用來看出前進） */
.backdrop {
  position: absolute; left: 0; right: 0; top: 0; bottom: var(--ground-h);
  background:
    linear-gradient(90deg, transparent 0 47%, #B4B2A9 47% 49%, transparent 49%) var(--scroll) 100% / 25% 28% repeat-x,
    linear-gradient(#EAF2F8, #EAF2F8);
}
/* 地面：三種材質 */
.ground {
  position: absolute; left: 0; right: 0; bottom: 0; height: var(--ground-h);
  border-top: 2px solid rgba(0, 0, 0, 0.25);
  background-position: var(--scroll) 0;
}
.ground[data-texture="rough"] {
  background-color: #A08C68;
  background-image:
    radial-gradient(circle at 20% 30%, #6E5D40 0 9%, transparent 10%),
    radial-gradient(circle at 70% 65%, #5C4D34 0 12%, transparent 13%),
    radial-gradient(circle at 45% 80%, #C9B48C 0 7%, transparent 8%),
    radial-gradient(circle at 85% 20%, #7D6A4A 0 6%, transparent 7%);
  background-size: 6% 100%, 9% 100%, 7% 100%, 11% 100%;
}
.ground[data-texture="normal"] {
  background-color: #C8B79A;
  background-image: repeating-linear-gradient(60deg, #B7A483 0 3px, transparent 3px 9px);
}
.ground[data-texture="smooth"] {
  background-color: #D7E3EA;
  background-image:
    linear-gradient(90deg, transparent 0 99%, rgba(120, 150, 170, 0.35) 99%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.85) 0 18%, transparent 30%);
  background-size: 25% 100%, 100% 100%;
}

/* 推不動時的用力抖動 */
.strain { animation: strain 0.18s linear infinite; }
@keyframes strain {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(0.35%); }
}

/* 力箭頭 */
.arrow-line, .arrow-head { stroke-linecap: round; }
.arrow-label {
  font-size: 34px; font-weight: 700;
  paint-order: stroke; stroke: #FFFFFF; stroke-width: 8px; stroke-linejoin: round;
}
.arrow-origin { fill: #2C2C2A; stroke: #FFFFFF; stroke-width: 3; }

/* 數值卡 */
.values { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }
.value { border-radius: var(--radius); padding: 8px 10px; display: flex; flex-direction: column; gap: 2px; }
.value--push { background: var(--push-bg); color: var(--push-text); border: 4px solid #46cccc;}
.value--friction { background: var(--friction-bg); color: var(--friction-text); border: 4px solid #ffc76c;}
.value-label { font-size: 12px; font-weight: 500; }
.value-num { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1.2; }

/* 結果文字 */
.result {
  margin-top: 10px; padding: 10px 12px; border-radius: var(--radius);
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center; text-align: center; gap: 6px 12px;
  font-weight: 700; font-size: 15px;
}
.result[data-kind="static"]   { background: var(--static-bg); color: var(--static-text); }
.result[data-kind="critical"] { background: var(--critical-bg); color: var(--critical-text); }
.result[data-kind="sliding"]  { background: var(--sliding-bg); color: var(--sliding-text); }
.result[data-kind="limit"]    { background: var(--danger-bg); color: var(--danger); }
.link-btn {
  border: none; background: none; padding: 2px 0; font-size: 13px; font-weight: 500;
  color: inherit; text-decoration: underline; text-underline-offset: 3px;
}

/* ---------- 控制區 ---------- */
.ctl-label { margin: 2px 0 6px; font-size: 14px; font-weight: 700; }
.ctl-label small { font-weight: 400; color: var(--text-2); margin-left: 2px; }
.seg {
  display: grid; grid-auto-columns: 1fr; grid-auto-flow: column;
  border: 1.5px solid #C9C6BC; border-radius: var(--radius); overflow: hidden; margin-bottom: 14px;
}
.seg button {
  border: none; border-left: 1px solid var(--line); background: var(--card);
  padding: 10px 4px; font-size: 16px; min-height: 44px;
}
.seg button:first-child { border-left: none; }
.seg button[aria-pressed="true"] { background: var(--ctl); color: #FFFFFF; font-weight: 700; }
.seg button:disabled:not([aria-pressed="true"]) { color: #B4B2A9; }
.seg button:disabled[aria-pressed="true"] { opacity: 0.6; }

.force-row { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.step-btn {
  flex: none; width: 44px; height: 44px; border-radius: var(--radius);
  border: 1.5px solid #C9C6BC; background: var(--card); font-size: 22px; line-height: 1;
}
.step-btn:disabled { color: #B4B2A9; }
#forceSlider { flex: 1; min-width: 0; accent-color: var(--ctl); height: 32px; }
#forceOut { flex: none; min-width: 56px; text-align: right; font-size: 20px; font-weight: 700; color: var(--ctl); font-variant-numeric: tabular-nums; }

.start-btn {
  width: 100%; min-height: 52px; border: none; border-radius: var(--radius);
  background: var(--ctl); color: #FFFFFF; font-size: 18px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.start-btn:active:not(:disabled) { transform: scale(0.98); }
.start-btn.is-running { opacity: 0.55; }

/* ---------- 折線圖 ---------- */
.chart-card { scroll-margin-top: 12px; }
.controls .ctl-group:last-of-type .force-row { margin-bottom: 14px; }
.chart-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.chart-head h2 { margin: 0; font-size: 16px; }
.count { font-size: 12px; color: var(--text-2); font-variant-numeric: tabular-nums; }
.chart-tools { display: flex; align-items: center; gap: 8px; margin: 10px 0 6px; }
.tools-label { font-size: 13px; color: var(--text-2); }
.seg--small { margin: 0; border-width: 1px; }
.seg--small button { font-size: 13px; padding: 4px 10px; min-height: 32px; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 6px; margin-bottom: 6px; min-height: 28px; }
.legend-item {
  display: inline-flex; align-items: center; gap: 4px; padding: 3px 8px 3px 4px;
  border: 1px solid transparent; border-radius: 999px; background: none; font-size: 13px; color: var(--text-2);
}
.legend-item.is-current { border-color: var(--line); background: #FAF9F5; color: var(--text); font-weight: 700; }
.legend-item.is-hidden { opacity: 0.4; text-decoration: line-through; }
.legend-item:disabled { cursor: default; color: var(--text-2); }
.chart-box { position: relative; height: 300px; }
.chart-foot { display: flex; justify-content: flex-end; margin-top: 8px; }
.chart-empty {
  position: absolute; inset: 0; margin: 0; display: flex; align-items: center; justify-content: center;
  padding: 0 24px 30px 50px; text-align: center; font-size: 14px; color: var(--text-2); pointer-events: none;
}

.reset-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: var(--radius);
  border: 1.5px solid var(--danger); background: var(--card); color: var(--danger); font-weight: 700; font-size: 14px;
}
.reset-btn:disabled { opacity: 0.4; }

/* ---------- 頁尾 ---------- */
.site-footer { max-width: 1760px; margin: 0 auto; padding: 8px 16px 24px; text-align: center; font-size: 12px; color: var(--text-2); }

/* ---------- 對話視窗 ---------- */
.dialog {
  border: none; border-radius: 16px; padding: 20px; width: min(92vw, 420px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25); color: var(--text);
}
.dialog::backdrop { background: rgba(30, 30, 28, 0.45); }
.dialog h2 { margin: 0 32px 8px 0; font-size: 18px; }
.dialog-text { margin: 0 0 16px; font-size: 16px; line-height: 1.7; }
.dialog-close {
  position: absolute; top: 10px; right: 10px; width: 36px; height: 36px;
  border: none; background: none; font-size: 24px; color: var(--text-2);
}
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }
.dialog-actions button { min-height: 42px; padding: 0 18px; border-radius: var(--radius); font-weight: 700; }
.btn-primary { border: none; background: var(--ctl); color: #FFFFFF; }
.btn-secondary { border: 1.5px solid #C9C6BC; background: var(--card); }
.btn-danger { border: none; background: var(--danger); color: #FFFFFF; }
.dots { display: flex; gap: 6px; justify-content: center; margin: 0 0 14px; }
.dots span { width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
.dots span.on { background: var(--ctl); }

/* ---------- 電腦版排版（放在最後，才能覆蓋上面的手機設定） ---------- */
@media (min-width: 900px) {
  body { display: flex; flex-direction: column; height: 100vh; height: 100dvh; min-height: 640px; }
  .site-header, .site-footer { flex: none; width: 100%; }
  .site-header { padding: 12px 20px 4px; }
  .site-header h1 { font-size: 22px; }
  .layout {
    flex: 1 1 auto; min-height: 0; width: 100%;
    padding: 8px 20px;  gap: 16px;
    /* 右欄寬度：最窄 360px、最寬 420px，其餘空間都給動畫 */
    grid-template-columns: minmax(0, 1fr) clamp(360px, 30vw, 420px);
    grid-template-rows: auto minmax(0, 1fr);
    grid-template-areas: "sim ctl" "sim rec";
  }
  .sim-card   { grid-area: sim; display: flex; flex-direction: column; min-height: 0; }
  .controls   { grid-area: ctl; }
  .chart-card { grid-area: rec; min-height: 0; }
  .chart-card .chart-box { height: auto; min-height: 150px; }
  /* 結果文字預留位置，出現時動畫畫面不會跳動 */
  .result[hidden] { display: flex !important; visibility: hidden; }
  .link-btn { display: none; }   /* 圖表就在旁邊，不需要捲動連結 */
  .site-footer { padding: 2px 20px 10px; }

  /* 控制區：質量與接觸面左右並排，讓圖表有更多高度 */
  .controls { display: grid; grid-template-columns: 1fr 1fr; column-gap: 12px; }
  .ctl-group--wide, .start-btn { grid-column: 1 / -1; }
  .seg button { font-size: 15px; }

  /* 紀錄卡：重置按鈕移到「刻度」同一列右側 */
  .chart-card {
    display: grid; grid-template-columns: 1fr auto; column-gap: 8px;
    grid-template-rows: auto auto auto minmax(0, 1fr);
    grid-template-areas: "head head" "tools reset" "legend legend" "box box";
  }
  .chart-head  { grid-area: head; }
  .chart-tools { grid-area: tools; }
  .chart-foot  { grid-area: reset; align-self: center; margin: 0; }
  .legend      { grid-area: legend; }
  .chart-box   { grid-area: box; }
  .reset-btn   { padding: 6px 12px; }

  /* 控制區在右欄排得緊湊一點 */
  .seg { margin-bottom: 10px; }
  .seg button { min-height: 40px; padding: 6px 4px; }
  .force-row { margin-bottom: 12px; }
  .step-btn { width: 40px; height: 40px; }
  .start-btn { min-height: 46px; }
}


body {
  background: var(--bg) url('../assets/images/bg.png') center top / cover no-repeat;
}

.logo { height: 40px; width: auto; }        /* 調整 height 改變大小，寬度會等比例縮放 */
.site-header h1 { flex: 1; }   

.backdrop {
  background: url('../assets/images/sky.png') var(--scroll) bottom / auto 100% repeat-x;
}