/* ============================================================
   力量 / 举重类计算器 · 共享样式（炽焰钢铁主题 / Ember & Iron）
   作用域 .fit —— 区别于健身营养的 emerald/cyan 活力风，采用 orange/red 暖色钢铁配色
   支持暗黑模式：跟随 <html data-theme="dark">
   被以下工具复用：1rm-calc、strength-volume-calc
   数字统一采用 tabular-nums 等宽数位，体现“重量/吨数”的工业质感
   ============================================================ */

.fit {
  --fit-bg: #fbf6f1;
  --fit-bg-2: #ffe6d2;
  --fit-card: #ffffff;
  --fit-card-2: #fbeede;
  --fit-text: #2a1a0f;
  --fit-muted: #8a6c57;
  --fit-accent: #f97316;
  --fit-accent-2: #ef4444;
  --fit-accent-3: #f59e0b;
  --fit-border: #ecd6c4;
  --fit-track: #ecd6c4;
  --fit-input-bg: #ffffff;
  --fit-shadow: 0 14px 34px rgba(249, 115, 22, .14);
  --fit-shadow-sm: 0 4px 14px rgba(249, 115, 22, .14);

  position: relative;
  min-height: 60vh;
  padding: 28px 0 60px;
  color: var(--fit-text);
  background:
    radial-gradient(1100px 460px at 8% -8%, var(--fit-bg-2), transparent 58%),
    radial-gradient(900px 420px at 100% 0%, #ffe1cf, transparent 55%),
    var(--fit-bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

[data-theme="dark"] .fit {
  --fit-bg: #160f0a;
  --fit-bg-2: #2c160b;
  --fit-card: #20150c;
  --fit-card-2: #2b1c10;
  --fit-text: #f6ece1;
  --fit-muted: #b9977f;
  --fit-accent: #fb923c;
  --fit-accent-2: #f87171;
  --fit-accent-3: #fbbf24;
  --fit-border: #3c2a1a;
  --fit-track: #3c2a1a;
  --fit-input-bg: #2b1c10;
  --fit-shadow: 0 16px 38px rgba(0, 0, 0, .55);
  --fit-shadow-sm: 0 4px 14px rgba(0, 0, 0, .4);
}

.fit * { box-sizing: border-box; }

.fit-wrap { max-width: 980px; margin: 0 auto; padding: 0 18px; }

/* 顶部 Hero */
.fit-hero { text-align: center; padding: 14px 12px 26px; }
.fit-kicker {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 5px 14px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(120deg, var(--fit-accent), var(--fit-accent-2));
  margin-bottom: 14px;
}
.fit-hero h1 {
  margin: 0 0 10px;
  font-size: 30px;
  line-height: 1.25;
  letter-spacing: .3px;
  background: linear-gradient(120deg, var(--fit-accent), var(--fit-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.fit-hero p { margin: 0 auto; max-width: 660px; color: var(--fit-muted); font-size: 15px; line-height: 1.7; }
.fit-badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 16px; }
.fit-badge {
  font-size: 12.5px; padding: 5px 12px; border-radius: 999px;
  background: var(--fit-card-2); border: 1px solid var(--fit-border); color: var(--fit-text);
}

/* 网格 */
.fit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 760px) { .fit-grid { grid-template-columns: 1fr; } }

.fit-card {
  position: relative;
  background: var(--fit-card);
  border: 1px solid var(--fit-border);
  border-radius: 20px;
  padding: 22px 22px 24px;
  box-shadow: var(--fit-shadow);
  overflow: hidden;
}
.fit-card::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 6px;
  background: linear-gradient(180deg, var(--fit-accent), var(--fit-accent-2));
}
.fit-card-title { display: flex; align-items: center; gap: 8px; font-size: 17px; font-weight: 700; margin: 0 0 18px; }

/* 表单 */
.fit-field { margin-bottom: 18px; }
.fit-field > label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.fit-input-wrap { position: relative; display: flex; align-items: center; }
.fit-input {
  width: 100%; height: 50px; padding: 0 60px 0 16px;
  font-size: 18px; color: var(--fit-text); background: var(--fit-input-bg);
  border: 1.5px solid var(--fit-border); border-radius: 14px; outline: none;
  transition: border-color .15s, box-shadow .15s;
  font-variant-numeric: tabular-nums;
}
.fit-input:focus { border-color: var(--fit-accent); box-shadow: 0 0 0 4px rgba(249, 115, 22, .16); }
.fit-input::-webkit-outer-spin-button, .fit-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.fit-input[type=number] { -moz-appearance: textfield; }
.fit-suffix { position: absolute; right: 16px; font-size: 14px; color: var(--fit-muted); pointer-events: none; }
.fit-help { margin: 8px 0 0; font-size: 12.5px; line-height: 1.6; color: var(--fit-muted); }

.fit-select {
  width: 100%; height: 50px; padding: 0 16px; font-size: 16px;
  color: var(--fit-text); background: var(--fit-input-bg);
  border: 1.5px solid var(--fit-border); border-radius: 14px; outline: none;
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%238a6c57' stroke-width='3'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat; background-position: right 16px center;
}
.fit-select:focus { border-color: var(--fit-accent); }

/* 按钮 */
.fit-btn {
  height: 50px; border: none; border-radius: 14px; font-size: 16px; font-weight: 700;
  cursor: pointer; transition: transform .12s, box-shadow .15s, opacity .15s;
}
.fit-btn:active { transform: translateY(1px); }
.fit-btn-primary { width: 100%; color: #fff; background: linear-gradient(120deg, var(--fit-accent), var(--fit-accent-2)); box-shadow: var(--fit-shadow-sm); }
.fit-btn-primary:hover { box-shadow: 0 8px 22px rgba(239, 68, 68, .35); }
.fit-btn-ghost { width: 100%; margin-top: 10px; color: var(--fit-accent); background: var(--fit-card-2); border: 1.5px solid var(--fit-border); }
.fit-btn-row { display: flex; gap: 10px; margin-top: 10px; }
.fit-btn-row .fit-btn { flex: 1; height: 44px; font-size: 14px; }

.fit-err { margin-top: 12px; padding: 10px 14px; border-radius: 12px;
  background: rgba(255, 90, 110, .1); border: 1px solid rgba(255, 90, 110, .35); color: #d6445a; font-size: 13.5px; }
[data-theme="dark"] .fit-err { color: #ff9bab; background: rgba(255, 90, 110, .16); }

/* 结果 */
.fit-empty { text-align: center; padding: 40px 10px; color: var(--fit-muted); }
.fit-empty .fit-emoji { font-size: 46px; }
.fit-empty p { margin-top: 12px; font-size: 14px; line-height: 1.7; }
.fit-result[hidden] { display: none; }

.fit-hero-num { text-align: center; padding: 16px 0 6px; }
.fit-hero-num .fit-label { font-size: 13px; color: var(--fit-muted); }
.fit-hero-num .fit-big { font-size: 44px; font-weight: 800; line-height: 1.1;
  background: linear-gradient(120deg, var(--fit-accent), var(--fit-accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-variant-numeric: tabular-nums; }
.fit-hero-num .fit-big small { font-size: 16px; font-weight: 700; margin-left: 4px; }
.fit-hero-num .fit-sub { font-size: 13px; color: var(--fit-muted); margin-top: 6px; }

.fit-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.fit-metric { background: var(--fit-card-2); border: 1px solid var(--fit-border); border-radius: 16px; padding: 14px; }
.fit-metric .k { display: block; font-size: 12.5px; color: var(--fit-muted); margin-bottom: 6px; }
.fit-metric .v { font-size: 20px; font-weight: 800; font-variant-numeric: tabular-nums; }
.fit-metric.is-1rm .v { color: var(--fit-accent-2); }
.fit-metric.is-main .v { color: var(--fit-accent); }
.fit-metric .v small { font-size: 13px; font-weight: 600; color: var(--fit-muted); margin-left: 2px; }

/* 堆叠占比条（肌群容量分布） */
.fit-bar { display: flex; height: 22px; border-radius: 999px; overflow: hidden; margin-top: 14px; background: var(--fit-track); }
.fit-bar > span { display: flex; align-items: center; justify-content: center; color: #fff; font-size: 11.5px; font-weight: 700; min-width: 0; transition: flex .3s; }
.fit-bar .b-legs { background: linear-gradient(135deg, #f97316, #ea580c); }
.fit-bar .b-back { background: linear-gradient(135deg, #ef4444, #dc2626); }
.fit-bar .b-chest { background: linear-gradient(135deg, #f59e0b, #d97706); }
.fit-bar .b-shoulders { background: linear-gradient(135deg, #fb923c, #f97316); }
.fit-bar .b-arms { background: linear-gradient(135deg, #fb7185, #e11d48); }
.fit-bar .b-core { background: linear-gradient(135deg, #facc15, #ca8a04); }
.fit-bar .b-other { background: linear-gradient(135deg, #94a3b8, #64748b); }
.fit-bar-cap { display: flex; gap: 16px; margin-top: 10px; font-size: 12.5px; color: var(--fit-muted); flex-wrap: wrap; }
.fit-bar-cap i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 5px; vertical-align: middle; }

.fit-subhead { margin: 22px 0 10px; font-size: 15px; font-weight: 700; }
.fit-note { background: var(--fit-card-2); border-left: 4px solid var(--fit-accent); border-radius: 12px; padding: 12px 14px; font-size: 13px; line-height: 1.7; color: var(--fit-text); }

.fit-bill { list-style: none; margin: 10px 0 0; padding: 0; }
.fit-bill li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 2px; border-bottom: 1px dashed var(--fit-border); font-size: 14px; }
.fit-bill li:last-child { border-bottom: none; }
.fit-bill .bk { color: var(--fit-muted); }
.fit-bill .bv { font-weight: 700; text-align: right; font-variant-numeric: tabular-nums; }

/* AI */
.fit-ai { margin-top: 16px; }
.fit-ai-box {
  margin-top: 12px; min-height: 56px; padding: 14px 16px; border-radius: 16px;
  background: var(--fit-card-2); border: 1px solid var(--fit-border);
  font-size: 14px; line-height: 1.8; white-space: pre-wrap; color: var(--fit-text);
}
.fit-ai-box:empty::before { content: "点击上方按钮，让 AI 结合本次结果给出个性化建议。"; color: var(--fit-muted); }
.fit-ai-box.fit-ai-err { color: #d6445a; border-color: rgba(255,90,110,.35); }
[data-theme="dark"] .fit-ai-box.fit-ai-err { color: #ff9bab; }

/* 表 / 免责 / 信息 */
.fit-tables { margin-top: 22px; display: grid; gap: 18px; }
.fit-table-card { background: var(--fit-card); border: 1px solid var(--fit-border); border-radius: 20px; padding: 20px 22px 22px; box-shadow: var(--fit-shadow); }
.fit-table-card h2 { margin: 0 0 4px; font-size: 17px; }
.fit-table-card .fit-help { margin-bottom: 12px; }
.fit-table-scroll { overflow-x: auto; }
.fit-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.fit-table th, .fit-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--fit-border); white-space: nowrap; }
.fit-table th { color: var(--fit-muted); font-weight: 600; background: var(--fit-card-2); }
.fit-table tr:last-child td { border-bottom: none; }
.fit-table .hl { color: var(--fit-accent); font-weight: 700; }

.fit-disclaim { margin-top: 24px; padding: 16px 18px; border-radius: 16px; background: var(--fit-card-2); border: 1px solid var(--fit-border); font-size: 13px; line-height: 1.8; color: var(--fit-muted); }
.fit-disclaim b { color: var(--fit-text); }

.fit-info { margin-top: 26px; }
.fit-info h1 { font-size: 22px; margin: 0 0 14px; }
.fit-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 18px; }
.fit-chip { font-size: 12.5px; padding: 6px 12px; border-radius: 999px; background: var(--fit-card); border: 1px solid var(--fit-border); color: var(--fit-text); }
.fit-chip::before { content: "●"; color: var(--fit-accent); margin-right: 6px; font-size: 9px; vertical-align: middle; }
.fit-prose { font-size: 14.5px; line-height: 1.9; color: var(--fit-text); }
.fit-prose b { color: var(--fit-accent); }
.fit-prose p { margin: 0 0 12px; }

.fit-faq-item { border: 1px solid var(--fit-border); border-radius: 14px; padding: 4px 16px; margin-bottom: 10px; background: var(--fit-card); }
.fit-faq-item summary { cursor: pointer; font-weight: 700; font-size: 14.5px; padding: 12px 0; list-style: none; }
.fit-faq-item summary::-webkit-details-marker { display: none; }
.fit-faq-item summary::after { content: "＋"; float: right; color: var(--fit-accent); font-weight: 700; }
.fit-faq-item[open] summary::after { content: "－"; }
.fit-faq-a { padding: 0 0 14px; font-size: 14px; line-height: 1.85; color: var(--fit-text); }

.fit-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.fit-meta .item { flex: 1 1 140px; background: var(--fit-card-2); border: 1px solid var(--fit-border); border-radius: 14px; padding: 12px 14px; }
.fit-meta .k { display: block; font-size: 12px; color: var(--fit-muted); margin-bottom: 4px; }
.fit-meta .v { font-weight: 700; font-size: 14px; }

.fit-back { position: fixed; right: 22px; bottom: 26px; width: 46px; height: 46px; border-radius: 50%; border: none;
  background: linear-gradient(135deg, var(--fit-accent), var(--fit-accent-2)); color: #fff; font-size: 20px; cursor: pointer;
  box-shadow: var(--fit-shadow); opacity: 0; pointer-events: none; transition: opacity .25s; z-index: 30; }
.fit-back.show { opacity: 1; pointer-events: auto; }

/* 力量工具专有：动作输入行（容量计算器） */
.fit-rows { display: grid; gap: 10px; }
.fit-row {
  display: grid; grid-template-columns: 1.3fr .9fr .7fr .6fr .6fr .6fr 34px; gap: 8px; align-items: center;
  background: var(--fit-card-2); border: 1px solid var(--fit-border); border-radius: 14px; padding: 8px 10px;
}
.fit-row .fit-mini { width: 100%; height: 40px; padding: 0 10px; font-size: 14px; color: var(--fit-text); background: var(--fit-input-bg);
  border: 1.5px solid var(--fit-border); border-radius: 10px; outline: none; font-variant-numeric: tabular-nums; }
.fit-row .fit-mini:focus { border-color: var(--fit-accent); }
.fit-row .fit-mini-sel { padding: 0 6px; cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a6c57' stroke-width='3'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat; background-position: right 8px center; }
.fit-row .fit-mini-lbl { font-size: 11px; color: var(--fit-muted); display: none; }
.fit-row-del { height: 40px; width: 34px; border: 1.5px solid var(--fit-border); background: var(--fit-card); border-radius: 10px;
  color: var(--fit-accent-2); font-size: 18px; font-weight: 700; cursor: pointer; }
.fit-row-del:hover { background: rgba(239,68,68,.12); }
@media (max-width: 760px) {
  .fit-row { grid-template-columns: 1fr 1fr; }
  .fit-row .fit-mini-lbl { display: block; }
  .fit-row-del { grid-column: span 2; width: 100%; }
}
.fit-rows-head { display: grid; grid-template-columns: 1.3fr .9fr .7fr .6fr .6fr .6fr 34px; gap: 8px; font-size: 11.5px; color: var(--fit-muted); padding: 0 10px; margin-bottom: 2px; }
@media (max-width: 760px) { .fit-rows-head { display: none; } }