/* ---------- 色彩 ----------
   --pine / --pine-2 : 拿來當「底色」的深綠（上面放白字）
   --strong / --accent : 拿來當「文字」的綠（放在底色上）
   兩者必須分開，否則深色模式會出現黑字黑底。
------------------------------------------------ */
:root {
  color-scheme: light dark;

  --pine:      #123a2f;   /* 底色用 */
  --pine-2:    #1d5c48;   /* 底色用（按鈕） */
  --strong:    #123a2f;   /* 文字用：標題、數字 */
  --accent:    #1d5c48;   /* 文字用：標籤、次要強調 */
  --pine-soft: #d8e6dc;
  --paper:     #e9efe7;
  --card:      #ffffff;
  --ink:       #16241f;
  --muted:     #5c6b63;
  --line:      #cdd9cf;

  --amber:     #f2a100;
  --lamp:      #ffd666;
  --sky:       #2c6e9b;
  --rust:      #b23a2e;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --shadow: 0 2px 4px rgba(18,58,47,.06), 0 8px 24px rgba(18,58,47,.08);

  --font: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;
}

/* 深色配色（單獨抽出來，讓「跟隨系統」和「手動選深色」共用） */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --pine:      #0d2a22;
    --pine-2:    #2b7a60;
    --strong:    #8fe0c0;
    --accent:    #6fd3ac;
    --pine-soft: #1c3a31;
    --paper:     #101815;
    --card:      #17231e;
    --ink:       #e7efe9;
    --muted:     #9bafa4;
    --line:      #2a3c34;
    --amber:     #ffb733;
    --sky:       #5aa9d8;
    --rust:      #e0645a;
    --shadow: 0 2px 4px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --pine:      #0d2a22;
  --pine-2:    #2b7a60;
  --strong:    #8fe0c0;
  --accent:    #6fd3ac;
  --pine-soft: #1c3a31;
  --paper:     #101815;
  --card:      #17231e;
  --ink:       #e7efe9;
  --muted:     #9bafa4;
  --line:      #2a3c34;
  --amber:     #ffb733;
  --sky:       #5aa9d8;
  --rust:      #e0645a;
  --shadow: 0 2px 4px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}
:root[data-theme="light"] { color-scheme: light; }

* { box-sizing: border-box; }

/* .keypad 等元素有 display:flex，類別選擇器會蓋掉 UA 的 [hidden]{display:none}，
   所以要明確宣告，否則 hidden 屬性形同無效 */
[hidden] { display: none !important; }

body {
  margin: 0;
  padding: 0 0 96px;              /* 留位置給底部導覽 */
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
  /* 快按按鈕時不要被判定成選字 */
  -webkit-user-select: none;
  user-select: none;
}

/* 但輸入 / 輸出的內容還是要能選取複製。
   select 一定要列進來：Android Chrome 在祖先有 user-select:none 時，
   收合狀態的選項文字會整個不顯示。 */
textarea, input, select, .search, code, .card-morse {
  -webkit-user-select: text;
  user-select: text;
}

/* 下拉展開後是原生元件，深色模式下要自己指定，否則可能黑字黑底 */
option {
  color: var(--ink);
  background: var(--card);
}

.app { max-width: 620px; margin: 0 auto; padding: 0 14px; }

/* ---------- 頂部 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin: 0 -14px; padding: 12px 16px;
  background: var(--pine);
  color: #fff;
  border-radius: 0 0 var(--r-lg) var(--r-lg);
  box-shadow: 0 6px 20px rgba(18,58,47,.25);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark { font-size: 26px; }
.brand-text h1 { margin: 0; font-size: 18px; font-weight: 800; letter-spacing: .5px; }
.brand-text p { margin: 2px 0 0; font-size: 11px; letter-spacing: 2px; color: #9fd3bf; }

.lamp-slot { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.lamp {
  width: 46px; height: 46px; border-radius: 50%;
  background: #24463c;
  border: 3px solid #35594d;
  box-shadow: inset 0 3px 8px rgba(0,0,0,.6);
  transition: background-color .04s linear, box-shadow .04s linear;
}
.lamp.on {
  background: var(--lamp);
  border-color: #fff0c2;
  box-shadow: 0 0 26px 6px rgba(255,214,102,.75), inset 0 0 8px rgba(255,255,255,.7);
}
.lamp-label { font-size: 10px; letter-spacing: 1px; color: #9fd3bf; }

/* ---------- 節奏帶（本 App 的招牌元素） ---------- */
.ribbon {
  display: flex; align-items: center; gap: 5px;
  min-height: 40px; margin: 10px 0 14px; padding: 0 12px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 5px solid var(--amber);
  border-radius: var(--r-sm);
  overflow-x: auto; overscroll-behavior-x: contain; scrollbar-width: none;
  /* 內容超出寬度時，左右邊緣淡出，提示還有東西 */
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 14px, #000 calc(100% - 14px), transparent 100%);
          mask-image: linear-gradient(90deg, transparent 0, #000 14px, #000 calc(100% - 14px), transparent 100%);
}
.ribbon::-webkit-scrollbar { display: none; }
.ribbon-idle { font-size: 12px; color: var(--muted); }
.ribbon .el {
  height: 12px; border-radius: 6px; flex: none;
  background: var(--pine-soft);
  transition: background-color .06s, transform .06s;
}
.ribbon .el.dot  { width: 12px; }
.ribbon .el.dash { width: 36px; }
.ribbon .el.lit  { background: var(--amber); transform: scaleY(1.35); }
.ribbon .el.done { background: var(--pine-2); }
.ribbon .gap  { width: 10px; flex: none; }
.ribbon .word { width: 6px; height: 20px; flex: none; border-left: 2px dotted var(--muted); }

/* ---------- 分頁面板 ---------- */
.panel { display: none; animation: fade .25s ease; }
.panel.is-active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- 表單元件 ---------- */
.field-label {
  display: flex; align-items: center; justify-content: space-between;
  margin: 14px 0 6px; font-size: 14px; font-weight: 700; color: var(--accent);
}
textarea, .select, .search {
  width: 100%; padding: 12px 14px;
  font-family: var(--font); font-size: 16px;
  color: var(--ink); background: var(--card);
  border: 2px solid var(--line); border-radius: var(--r-md);
  outline: none;
}
textarea { height: 92px; resize: vertical; line-height: 1.5; }
textarea.mono, .mono { font-family: var(--mono); letter-spacing: 1px; }
textarea:focus, .select:focus, .search:focus, .guess:focus {
  border-color: var(--pine-2);
  box-shadow: 0 0 0 4px rgba(29,92,72,.15);
}
.select {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding-right: 42px;
  font-weight: 600;
  color: var(--ink);
  -webkit-text-fill-color: var(--ink);
  background-color: var(--card);
  /* appearance:none 會把原生箭頭一起拿掉，自己畫一個回來 */
  background-image: linear-gradient(45deg, transparent 50%, var(--accent) 50%),
                    linear-gradient(135deg, var(--accent) 50%, transparent 50%);
  background-size: 7px 7px, 7px 7px;
  background-position: right 20px center, right 13px center;
  background-repeat: no-repeat;
}
.hint { margin: 8px 0 0; font-size: 13px; line-height: 1.6; color: var(--muted); }
.hint-strong { color: var(--accent); font-weight: 600; }
code { font-family: var(--mono); background: var(--pine-soft); padding: 1px 5px; border-radius: 4px; }

/* ---------- 按鈕 ---------- */
.btn {
  flex: 1; min-height: 48px; padding: 12px 16px;
  font-family: var(--font); font-size: 16px; font-weight: 700;
  color: #fff; background: var(--pine-2);
  border: none; border-radius: var(--r-md); cursor: pointer;
  transition: transform .06s, filter .15s;
}
.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(2px); }
.btn-primary { background: var(--pine-2); }
.btn-danger  { background: var(--rust); }
.btn-sky     { background: var(--sky); }
.btn-ghost   { background: var(--card); color: var(--accent); border: 2px solid var(--line); }
.btn-block   { width: 100%; flex: none; }
.btn-lg      { min-height: 56px; font-size: 18px; }
.btn-row { display: flex; gap: 8px; margin: 12px 0; flex-wrap: wrap; }
.btn-row-center { justify-content: center; }
.btn-row .btn { flex: 1 1 120px; }
.btn-row .btn-block { flex: 1 1 100%; }

.btn-mini {
  padding: 4px 10px; font-size: 12px; font-weight: 700;
  color: var(--accent); background: var(--card);
  border: 1px solid var(--line); border-radius: 999px; cursor: pointer;
}
.btn-mini-danger { color: #fff; background: var(--rust); border-color: var(--rust); }

/* ---------- 分段切換 ---------- */
.seg {
  display: flex; margin: 14px 0 8px; padding: 4px;
  background: var(--pine-soft); border-radius: 999px;
}
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label {
  flex: 1; padding: 10px 8px; text-align: center; cursor: pointer;
  font-size: 15px; font-weight: 700; color: var(--accent);
  border-radius: 999px; transition: .15s;
}
.seg input:checked + label { background: var(--card); color: var(--strong); box-shadow: var(--shadow); }
.seg input:focus-visible + label { outline: 3px solid var(--amber); }

/* ---------- 設定 ---------- */
.setting {
  margin: 14px 0; padding: 14px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r-md);
}
.setting > label { display: block; font-size: 15px; font-weight: 700; color: var(--accent); }
.setting b { color: var(--amber); font-size: 17px; }
.slider { width: 100%; margin: 10px 0 0; accent-color: var(--pine-2); height: 28px; }
.toggles { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0; }
.chip {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 14px; font-size: 15px; font-weight: 600; cursor: pointer;
  background: var(--card); border: 2px solid var(--line); border-radius: 999px;
}
.chip input, .check input { width: 18px; height: 18px; accent-color: var(--pine-2); }
.chip:has(input:checked) { border-color: var(--pine-2); background: var(--pine-soft); }
.check { display: flex; align-items: center; gap: 6px; margin-top: 8px; font-size: 14px; cursor: pointer; }

/* ---------- 學習字卡 ---------- */
.toolbar { margin: 14px 0 4px; }
.group-title {
  margin: 18px 0 8px; font-size: 13px; font-weight: 800;
  letter-spacing: 2px; color: var(--muted);
}
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(74px, 1fr)); gap: 8px; }
.card {
  padding: 10px 4px; text-align: center; cursor: pointer;
  background: var(--card); border: 2px solid var(--line); border-radius: var(--r-md);
  transition: .15s;
}
.card:hover { border-color: var(--pine-2); transform: translateY(-2px); box-shadow: var(--shadow); }
.card.playing { border-color: var(--amber); background: color-mix(in srgb, var(--amber) 16%, var(--card)); }
.card-char { font-size: 22px; font-weight: 800; color: var(--strong); }
.card-morse { margin-top: 4px; font-family: var(--mono); font-size: 13px; color: var(--muted); word-break: break-all; }
.card-char.sm { font-size: 16px; letter-spacing: 1px; }
.card-note { margin-top: 3px; font-size: 10px; line-height: 1.3; color: var(--muted); }
/* 統一符號的密碼比較長，字卡給它寬一點 */
.grid { grid-auto-flow: row dense; }
.card-wide { grid-column: span 2; }
.empty { padding: 24px; text-align: center; color: var(--muted); }

/* ---------- Koch ---------- */
.koch {
  margin: 12px 0; padding: 14px;
  background: var(--pine-soft); border: 1px solid var(--line); border-radius: var(--r-md);
}
.koch-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.koch-head strong { color: var(--strong); font-size: 15px; }
.koch-chars { font-size: 13px; color: var(--accent); text-align: right; word-break: break-all; }
.progress { height: 8px; margin-top: 10px; background: var(--card); border-radius: 999px; overflow: hidden; }
.progress-bar { height: 100%; width: 0%; background: var(--amber); border-radius: 999px; transition: width .3s; }

/* ---------- 題目卡 ---------- */
.question {
  display: flex; align-items: center; justify-content: center;
  min-height: 108px; margin: 14px 0; padding: 12px;
  font-size: 22px; font-weight: 700; text-align: center; color: var(--muted);
  background: var(--card); border: 3px dashed var(--line); border-radius: var(--r-lg);
}
.question.big { font-size: 68px; letter-spacing: 4px; color: var(--strong); border-color: var(--pine-2); border-style: solid; }
.question.listen { color: var(--sky); border-color: var(--sky); }
.question.win { color: var(--amber); border-color: var(--amber); font-size: 24px; }

/* 公布答案：上面大字元，下面密碼 */
.question.reveal {
  flex-direction: column; gap: 2px;
  color: var(--strong); border-color: var(--pine-2); border-style: solid;
}
.question.reveal b { font-size: 56px; line-height: 1.1; letter-spacing: 2px; }
.question.reveal span { font-size: 20px; letter-spacing: 3px; color: var(--muted); word-break: break-all; }
.question.reveal b { max-width: 100%; word-break: break-all; }

.guess {
  display: block; width: 100%; max-width: 330px; margin: 4px auto 14px;
  padding: 12px; font-family: var(--mono); font-size: 30px; font-weight: 700;
  text-align: center; text-transform: uppercase; letter-spacing: 4px;
  color: var(--ink); background: var(--card);
  border: 3px solid var(--pine-2); border-radius: var(--r-md); outline: none;
}
.guess.err { border-color: var(--rust); background: color-mix(in srgb, var(--rust) 12%, var(--card)); animation: shake .35s; }
.guess.ok  { border-color: var(--pine-2); background: color-mix(in srgb, var(--pine-2) 14%, var(--card)); box-shadow: 0 0 0 6px rgba(29,92,72,.15); }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-8px)} 75%{transform:translateX(8px)} }

.keypad { display: flex; gap: 10px; margin: 0 0 14px; }
.key {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
  min-height: 66px; font-size: 26px; font-weight: 800; color: #fff;
  border: none; border-radius: var(--r-md); cursor: pointer;
  box-shadow: 0 4px 0 rgba(0,0,0,.22);
  transition: transform .05s, box-shadow .05s;
}
.key small { font-size: 12px; font-weight: 600; opacity: .9; }
.key:active { transform: translateY(4px); box-shadow: none; }
.key-dot  { background: var(--sky); }
.key-dash { background: var(--rust); }
.key-del  { background: #6b7a72; font-size: 22px; }

.answer { min-height: 30px; margin: 12px 0; font-size: 16px; font-weight: 700; text-align: center; }
.answer.ok   { color: var(--accent); }
.answer.err  { color: var(--rust); }
.answer.info { color: var(--amber); }

.stats {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-top: 16px; padding: 12px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r-md);
}
.stat { flex: 1; min-width: 62px; text-align: center; }
.stat span { display: block; font-size: 20px; font-weight: 800; color: var(--strong); }
.stat small { font-size: 11px; color: var(--muted); }
.stat-fire span { color: var(--amber); }

/* ---------- 發報鍵 ---------- */
.tkey {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  width: 168px; height: 168px; margin: 18px auto;
  font-family: var(--font); font-size: 22px; font-weight: 800; color: #fff;
  background: radial-gradient(circle at 32% 28%, #e0574a, var(--rust) 62%);
  border: 6px solid #8f2c22; border-radius: 50%;
  cursor: pointer; box-shadow: 0 10px 0 #7d2620, 0 16px 26px rgba(0,0,0,.22);
  transition: transform .05s, box-shadow .05s;
  /* 長按不要跳複製選單，也不要被捲動 / 雙擊縮放搶走 */
  -webkit-touch-callout: none;
  touch-action: none;
}
.tkey small { font-size: 12px; font-weight: 600; opacity: .85; }
.tkey.down { transform: translateY(9px); box-shadow: 0 1px 0 #7d2620, 0 4px 10px rgba(0,0,0,.2); }

.readout { display: flex; gap: 10px; }
.readout-item {
  flex: 1; padding: 10px 12px; text-align: center;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r-md);
}
.readout-item small { font-size: 11px; color: var(--muted); }
.readout-big { margin-top: 2px; font-size: 24px; font-weight: 800; letter-spacing: 3px; color: var(--strong); min-height: 30px; }

/* ---------- 底部導覽 ---------- */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  display: flex; gap: 2px;
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
  background: var(--card);
  border-top: 1px solid var(--line);
  box-shadow: 0 -6px 20px rgba(18,58,47,.1);
}
.tab {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 8px 2px; font-family: var(--font); font-size: 11px; font-weight: 700;
  color: var(--muted); background: none; border: none; border-radius: var(--r-sm);
  cursor: pointer;
}
.tab span { font-size: 21px; line-height: 1; }
.tab.is-active { color: var(--strong); background: var(--pine-soft); }

@media (min-width: 700px) {
  .tabbar { position: static; margin: 16px 0 0; border-radius: var(--r-md); border: 1px solid var(--line); }
  body { padding-bottom: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}