/* ============================================================
   钣金展开长度与用料计算器 —— 蓝图工艺卡风格
   ============================================================ */

.sm-page {
  --sm-paper: #eef3f8;
  --sm-card: #ffffff;
  --sm-ink: #102436;
  --sm-ink-2: #29465e;
  --sm-ink-3: #6b8aa1;
  --sm-blue: #14608c;
  --sm-blue-2: #1b7aa8;
  --sm-blue-soft: #dcebf5;
  --sm-band: #c6dcec;
  --sm-cyan: #2f9fc4;
  --sm-orange: #d97b1f;
  --sm-orange-soft: #fbf0e2;
  --sm-line: #d5e2ec;
  --sm-line-2: #e8f0f6;
  --sm-grid: rgba(47, 159, 196, .1);
  --sm-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sm-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --sm-shadow: 0 1px 2px rgba(16, 36, 54, .05), 0 16px 34px -22px rgba(16, 36, 54, .34);

  background: var(--sm-paper);
  color: var(--sm-ink);
  font-family: var(--sm-sans);
  padding-bottom: 64px;
  overflow-x: hidden;
}

:root[data-theme="dark"] .sm-page {
  --sm-paper: #0b151d;
  --sm-card: #101f2b;
  --sm-ink: #e4eef6;
  --sm-ink-2: #a9c2d4;
  --sm-ink-3: #6e8b9e;
  --sm-blue: #6fc0e4;
  --sm-blue-2: #8fd2ef;
  --sm-blue-soft: #142d3d;
  --sm-band: #1e4055;
  --sm-cyan: #4fb6d8;
  --sm-orange: #e6a15a;
  --sm-orange-soft: #2a2115;
  --sm-line: #1d3140;
  --sm-line-2: #172836;
  --sm-grid: rgba(79, 182, 216, .1);
  --sm-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 20px 40px -26px rgba(0, 0, 0, .7);
}

.sm-page * { box-sizing: border-box; }
.sm-page h1, .sm-page h2, .sm-page h3 { margin: 0; font-weight: 700; letter-spacing: -.01em; }
.sm-page p { margin: 0; }
.sm-page a { color: inherit; text-decoration: none; }

.sm-wrap {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 22px;
}

/* ---------- 面包屑 ---------- */
.sm-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  padding: 16px 0 4px;
  font-size: 12.5px;
  color: var(--sm-ink-3);
}
.sm-crumb a { color: var(--sm-ink-3); transition: color .15s; }
.sm-crumb a:hover { color: var(--sm-blue); }
.sm-crumb span { color: var(--sm-ink-2); }

/* ---------- 首屏 ---------- */
.sm-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  gap: 34px;
  align-items: center;
  padding: 26px 0 40px;
  position: relative;
}
.sm-hero::before {
  content: "";
  position: absolute;
  inset: -40px -12vw -10px -12vw;
  background-image:
    linear-gradient(var(--sm-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--sm-grid) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(72% 66% at 58% 34%, #000 0%, transparent 78%);
  mask-image: radial-gradient(72% 66% at 58% 34%, #000 0%, transparent 78%);
  pointer-events: none;
  z-index: 0;
}
.sm-hero > * { position: relative; z-index: 1; }

.sm-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sm-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--sm-blue);
  background: var(--sm-blue-soft);
  border: 1px solid color-mix(in srgb, var(--sm-cyan) 32%, transparent);
  border-radius: 3px;
  padding: 5px 10px;
}
.sm-eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--sm-orange);
  transform: rotate(45deg);
}

.sm-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(28px, 3.5vw, 43px);
  line-height: 1.18;
  letter-spacing: -.025em;
  color: var(--sm-ink);
}
.sm-hero h1 b {
  color: var(--sm-blue);
  position: relative;
  white-space: nowrap;
}
.sm-hero h1 b::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 7px;
  background: color-mix(in srgb, var(--sm-cyan) 24%, transparent);
  z-index: -1;
}

.sm-sub {
  margin-top: 16px;
  max-width: 560px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sm-ink-2);
}
.sm-sub b { color: var(--sm-ink); font-weight: 600; }

.sm-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.sm-hero-tags span {
  font-size: 11.5px;
  color: var(--sm-ink-2);
  background: var(--sm-card);
  border: 1px solid var(--sm-line);
  border-radius: 3px;
  padding: 5px 9px;
  letter-spacing: .02em;
}
.sm-hero-tags span::before {
  content: "▸";
  color: var(--sm-cyan);
  margin-right: 5px;
  font-size: 10px;
}

.sm-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 按钮 ---------- */
.sm-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-family: var(--sm-sans);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .01em;
  border-radius: 4px;
  padding: 11px 20px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s, box-shadow .18s, background .18s, border-color .18s, color .18s;
}
.sm-btn.solid {
  color: #f4fbff;
  background: linear-gradient(150deg, #1a6f9c, #10496c);
  box-shadow: 0 8px 20px -12px rgba(20, 96, 140, .85);
}
.sm-btn.solid:hover { transform: translateY(-1px); box-shadow: 0 12px 24px -12px rgba(20, 96, 140, .9); }
.sm-btn.line {
  color: var(--sm-ink-2);
  background: var(--sm-card);
  border-color: var(--sm-line);
}
.sm-btn.line:hover { border-color: var(--sm-cyan); color: var(--sm-blue); }
:root[data-theme="dark"] .sm-btn.solid { background: linear-gradient(150deg, #2f9fc4, #1a6f9c); color: #04121a; }

/* ---------- 右侧折弯剖面板 ---------- */
.sm-plate {
  background:
    radial-gradient(120% 90% at 82% 4%, rgba(47, 159, 196, .2), transparent 60%),
    linear-gradient(168deg, #10293c, #0a1a27 68%);
  border: 1px solid rgba(47, 159, 196, .24);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(9, 22, 32, .18), 0 26px 50px -28px rgba(9, 22, 32, .7);
  color: #dcecf5;
}
.sm-plate-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px dashed rgba(47, 159, 196, .26);
  font-family: var(--sm-mono);
  font-size: 10px;
  letter-spacing: .13em;
  color: rgba(196, 224, 240, .62);
}
.sm-plate-head em { font-style: normal; color: var(--sm-orange); }

.sm-plate-canvas {
  position: relative;
  padding: 6px 10px 0;
  background-image:
    linear-gradient(rgba(47, 159, 196, .09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 159, 196, .09) 1px, transparent 1px);
  background-size: 20px 20px;
}
.sm-plate-canvas svg { display: block; width: 100%; height: auto; }

.sm-plate-dims {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1px;
  background: rgba(47, 159, 196, .18);
  border-top: 1px solid rgba(47, 159, 196, .18);
  border-bottom: 1px solid rgba(47, 159, 196, .18);
}
.sm-plate-dims > div {
  background: rgba(8, 22, 32, .46);
  padding: 11px 16px;
}
.sm-plate-dims span,
.sm-plate-meta span { display: block; font-size: 10.5px; letter-spacing: .06em; color: rgba(196, 224, 240, .58); }
.sm-plate-dims b {
  font-family: var(--sm-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -.02em;
  color: #f0f8fd;
}
.sm-plate-dims em { font-style: normal; margin-left: 4px; font-size: 10.5px; color: rgba(196, 224, 240, .5); }

.sm-plate-meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 8px;
  padding: 11px 16px;
}
.sm-plate-meta b {
  display: block;
  margin-top: 3px;
  font-size: 12.5px;
  font-weight: 600;
  color: #cfe6f3;
}

.sm-plate-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px 15px;
  background: linear-gradient(140deg, rgba(47, 159, 196, .17), rgba(47, 159, 196, .05));
  border-top: 1px dashed rgba(47, 159, 196, .26);
}
.sm-plate-big span { display: block; font-size: 10.5px; letter-spacing: .08em; color: rgba(196, 224, 240, .6); }
.sm-plate-big b {
  font-family: var(--sm-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.04em;
  color: #8fdcf8;
}
.sm-plate-big em { font-style: normal; margin-left: 4px; font-size: 12px; color: rgba(196, 224, 240, .6); }
.sm-plate-mini { display: grid; gap: 7px; text-align: right; }
.sm-plate-mini span { display: block; font-size: 10px; color: rgba(196, 224, 240, .55); }
.sm-plate-mini b { font-family: var(--sm-mono); font-size: 13px; font-weight: 600; color: #e7f5fc; }

/* ---------- 主区布局 ---------- */
.sm-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 24px;
  align-items: start;
  padding-top: 8px;
}
.sm-main { display: grid; gap: 18px; min-width: 0; }

/* ---------- 区块 ---------- */
.sm-block {
  background: var(--sm-card);
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  box-shadow: var(--sm-shadow);
  overflow: hidden;
}
.sm-block-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px 20px 13px;
  border-bottom: 1px solid var(--sm-line-2);
  background: linear-gradient(180deg, color-mix(in srgb, var(--sm-blue-soft) 55%, var(--sm-card)), var(--sm-card));
}
.sm-no {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-top: 1px;
  font-family: var(--sm-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--sm-blue);
  background: var(--sm-card);
  border: 1px solid color-mix(in srgb, var(--sm-cyan) 44%, transparent);
  border-radius: 3px;
}
.sm-block-head h2 { font-size: 16px; letter-spacing: -.005em; }
.sm-block-head p { margin-top: 3px; font-size: 12px; color: var(--sm-ink-3); }
.sm-block-body { padding: 18px 20px 20px; display: grid; gap: 16px; }

/* ---------- 表单 ---------- */
.sm-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
}
.sm-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.sm-field { display: grid; gap: 6px; min-width: 0; }
.sm-field > label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--sm-ink);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 7px;
}
.sm-field > label em {
  font-style: normal;
  font-weight: 400;
  font-size: 11px;
  letter-spacing: .01em;
  color: var(--sm-ink-3);
}
.sm-field-note { font-size: 11px; line-height: 1.55; color: var(--sm-ink-3); }

.sm-input {
  display: flex;
  align-items: stretch;
  background: var(--sm-paper);
  border: 1px solid var(--sm-line);
  border-radius: 4px;
  transition: border-color .16s, box-shadow .16s, background .16s;
}
.sm-input:focus-within {
  border-color: var(--sm-cyan);
  background: var(--sm-card);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--sm-cyan) 16%, transparent);
}
.sm-input input {
  flex: 1 1 auto;
  min-width: 0;
  width: 100%;
  padding: 10px 4px 10px 12px;
  border: 0;
  outline: 0;
  background: transparent;
  font-family: var(--sm-mono);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--sm-ink);
  -moz-appearance: textfield;
}
.sm-input input::-webkit-outer-spin-button,
.sm-input input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.sm-input > span {
  flex: none;
  display: inline-flex;
  align-items: center;
  padding: 0 11px;
  font-size: 11px;
  color: var(--sm-ink-3);
  border-left: 1px solid var(--sm-line-2);
  white-space: nowrap;
}

.sm-sub-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
}
.sm-sub-head h3 { font-size: 13px; font-weight: 700; color: var(--sm-ink-2); }
.sm-sub-head p { font-size: 11.5px; color: var(--sm-ink-3); margin-left: auto; }

/* ---------- 芯片 ---------- */
.sm-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.sm-chips button {
  font-family: var(--sm-sans);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--sm-ink-2);
  background: var(--sm-card);
  border: 1px solid var(--sm-line);
  border-radius: 3px;
  padding: 7px 12px;
  cursor: pointer;
  transition: all .16s;
}
.sm-chips button:hover { border-color: var(--sm-cyan); color: var(--sm-blue); }
.sm-chips button.on {
  color: #f3fbff;
  background: linear-gradient(150deg, #1a6f9c, #10496c);
  border-color: transparent;
  box-shadow: 0 6px 14px -10px rgba(20, 96, 140, .9);
}
:root[data-theme="dark"] .sm-chips button.on { color: #04121a; }

.sm-seg button { font-family: var(--sm-mono); font-size: 12px; letter-spacing: .01em; }

.sm-mat-tip {
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--sm-ink-3);
  background: var(--sm-paper);
  border-left: 2px solid var(--sm-cyan);
  border-radius: 0 3px 3px 0;
  padding: 9px 12px;
}

.sm-legs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px 16px;
}
.sm-leg[hidden] { display: none; }

.sm-legsum {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--sm-line-2);
  border: 1px solid var(--sm-line-2);
  border-radius: 5px;
  overflow: hidden;
}
.sm-legsum > div { background: var(--sm-paper); padding: 10px 13px; }
.sm-legsum span { display: block; font-size: 10.5px; letter-spacing: .04em; color: var(--sm-ink-3); }
.sm-legsum b {
  font-family: var(--sm-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--sm-ink);
  letter-spacing: -.02em;
}
.sm-legsum em { font-style: normal; margin-left: 3px; font-size: 10.5px; color: var(--sm-ink-3); }

.sm-inline-tip {
  font-size: 12px;
  line-height: 1.75;
  color: var(--sm-ink-3);
  background: var(--sm-paper);
  border-left: 3px solid color-mix(in srgb, var(--sm-cyan) 62%, transparent);
  border-radius: 0 3px 3px 0;
  padding: 10px 13px;
}
.sm-inline-tip b { color: var(--sm-ink-2); }

/* ---------- 展开图 ---------- */
.sm-flat-wrap {
  border: 1px solid var(--sm-line-2);
  border-radius: 6px;
  background-image:
    linear-gradient(var(--sm-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--sm-grid) 1px, transparent 1px);
  background-size: 18px 18px;
  background-color: var(--sm-paper);
  padding: 8px 6px;
}
.sm-flat-wrap svg { display: block; width: 100%; height: auto; }

.sm-readout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 1px;
  background: var(--sm-line-2);
  border: 1px solid var(--sm-line-2);
  border-radius: 5px;
  overflow: hidden;
}
.sm-readout-main {
  background: linear-gradient(150deg, #123a52, #0d2737);
  padding: 14px 17px;
  color: #dcecf5;
}
.sm-readout-main span { display: block; font-size: 10.5px; letter-spacing: .08em; color: rgba(196, 224, 240, .62); }
.sm-readout-main b {
  font-family: var(--sm-mono);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -.04em;
  line-height: 1.15;
  color: #8fdcf8;
}
.sm-readout-main em { font-style: normal; margin-left: 4px; font-size: 11px; color: rgba(196, 224, 240, .6); }
.sm-readout-side { display: grid; grid-template-rows: 1fr 1fr; gap: 1px; background: var(--sm-line-2); }
.sm-readout-side > div { background: var(--sm-paper); padding: 9px 15px; display: flex; align-items: baseline; gap: 8px; }
.sm-readout-side span { font-size: 11px; color: var(--sm-ink-3); }
.sm-readout-side b { margin-left: auto; font-family: var(--sm-mono); font-size: 14.5px; font-weight: 600; color: var(--sm-ink); }
.sm-readout-side em { font-style: normal; font-size: 10px; color: var(--sm-ink-3); }

.sm-bend-list { display: grid; gap: 9px; }
.sm-bend-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; }
.sm-bend-head h3 { font-size: 13px; font-weight: 700; color: var(--sm-ink-2); }
.sm-bend-head p { font-size: 11.5px; color: var(--sm-ink-3); margin-left: auto; }

/* ---------- 表格 ---------- */
.sm-table-wrap {
  border: 1px solid var(--sm-line);
  border-radius: 5px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.sm-table { width: 100%; border-collapse: collapse; font-size: 12.5px; min-width: 520px; }
.sm-table th {
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--sm-ink-3);
  background: var(--sm-paper);
  padding: 9px 12px;
  border-bottom: 1px solid var(--sm-line);
  white-space: nowrap;
}
.sm-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--sm-line-2);
  color: var(--sm-ink-2);
  font-family: var(--sm-mono);
  font-size: 12px;
  white-space: nowrap;
}
.sm-table tbody tr:last-child td { border-bottom: 0; }
.sm-table tbody tr:hover td { background: color-mix(in srgb, var(--sm-blue-soft) 40%, transparent); }
.sm-table td:first-child { color: var(--sm-ink); font-weight: 600; }
.sm-table .bd { color: var(--sm-orange); }
.sm-table .pos { color: var(--sm-blue); font-weight: 600; }
.sm-table tr.empty td {
  text-align: center;
  color: var(--sm-ink-3);
  font-family: var(--sm-sans);
  font-size: 12px;
  padding: 22px 12px;
  white-space: normal;
}

/* ---------- 排板 ---------- */
.sm-sheet {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  gap: 16px;
  align-items: stretch;
}
.sm-sheet-canvas {
  border: 1px solid var(--sm-line-2);
  border-radius: 6px;
  background: var(--sm-paper);
  padding: 8px;
}
.sm-sheet-canvas svg { display: block; width: 100%; height: auto; }
.sm-sheet-stats { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1px; background: var(--sm-line-2); border: 1px solid var(--sm-line-2); border-radius: 5px; overflow: hidden; }
.sm-sheet-stats > div { background: var(--sm-paper); padding: 11px 13px; }
.sm-sheet-stats span { display: block; font-size: 10.5px; color: var(--sm-ink-3); letter-spacing: .03em; }
.sm-sheet-stats b { font-family: var(--sm-mono); font-size: 19px; font-weight: 600; color: var(--sm-ink); letter-spacing: -.025em; }
.sm-sheet-stats em { font-style: normal; margin-left: 3px; font-size: 10px; color: var(--sm-ink-3); }

/* ---------- 成本拆解 ---------- */
.sm-cost { border: 1px solid var(--sm-line); border-radius: 5px; overflow: hidden; }
.sm-cost-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 4px 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--sm-line-2);
  background: var(--sm-card);
}
.sm-cost-row:last-child { border-bottom: 0; }
.sm-cost-row:nth-child(even) { background: color-mix(in srgb, var(--sm-paper) 60%, var(--sm-card)); }
.sm-cost-row span { font-size: 12.5px; color: var(--sm-ink-2); }
.sm-cost-row b { font-family: var(--sm-mono); font-size: 14px; font-weight: 600; color: var(--sm-ink); text-align: right; white-space: nowrap; }
.sm-cost-row em { grid-column: 1 / -1; font-style: normal; font-size: 10.5px; color: var(--sm-ink-3); }
.sm-cost-row.sum {
  background: linear-gradient(140deg, color-mix(in srgb, var(--sm-blue-soft) 70%, var(--sm-card)), var(--sm-card));
  border-top: 1px solid color-mix(in srgb, var(--sm-cyan) 34%, transparent);
}
.sm-cost-row.sum b { font-size: 18px; color: var(--sm-blue); }

/* ---------- 批量 ---------- */
.sm-textarea {
  width: 100%;
  min-height: 108px;
  resize: vertical;
  padding: 11px 13px;
  font-family: var(--sm-mono);
  font-size: 12px;
  line-height: 1.75;
  color: var(--sm-ink);
  background: var(--sm-paper);
  border: 1px solid var(--sm-line);
  border-radius: 4px;
  outline: none;
  transition: border-color .16s, box-shadow .16s, background .16s;
}
.sm-textarea:focus {
  border-color: var(--sm-cyan);
  background: var(--sm-card);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--sm-cyan) 16%, transparent);
}
.sm-textarea::placeholder { color: var(--sm-ink-3); }

.sm-page .sm-page-format { font-size: 11.5px; line-height: 1.65; color: var(--sm-ink-3); margin-top: 7px; }

.sm-batch-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; }
.sm-batch-count { font-size: 12px; color: var(--sm-ink-3); margin-left: auto; font-family: var(--sm-mono); }

.sm-batch-err {
  font-size: 12.5px;
  line-height: 1.7;
  color: #a8452f;
  background: #fdf0ea;
  border: 1px solid rgba(168, 69, 47, .2);
  border-radius: 5px;
  padding: 9px 12px;
}
.sm-batch-err:empty { display: none; }
:root[data-theme="dark"] .sm-batch-err { color: #ffbda8; background: #2a1812; border-color: rgba(255, 150, 120, .24); }

/* ---------- AI ---------- */
.sm-ai {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px 18px;
  align-items: center;
  background:
    radial-gradient(110% 130% at 96% 0%, rgba(47, 159, 196, .16), transparent 58%),
    var(--sm-card);
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  padding: 18px 20px;
  box-shadow: var(--sm-shadow);
}
.sm-ai-copy h2 { font-size: 15.5px; }
.sm-ai-copy p { margin-top: 5px; font-size: 12.5px; line-height: 1.7; color: var(--sm-ink-3); max-width: 560px; }
.sm-btn.ai {
  color: #eaf7fd;
  background: linear-gradient(150deg, #17384e, #0d2434);
  border: 1px solid rgba(47, 159, 196, .34);
  white-space: nowrap;
}
.sm-btn.ai:hover { border-color: var(--sm-cyan); transform: translateY(-1px); }
.sm-btn.ai:disabled { opacity: .72; cursor: default; transform: none; }

.sm-ai-status {
  grid-column: 1 / -1;
  font-size: 12.5px;
  line-height: 1.78;
  color: var(--sm-ink-2);
  background: var(--sm-paper);
  border: 1px solid var(--sm-line);
  border-left: 3px solid var(--sm-cyan);
  border-radius: 0 5px 5px 0;
  padding: 12px 15px;
}
.sm-ai-status[hidden] { display: none; }
.sm-ai-status p { margin: 0 0 7px; }
.sm-ai-status p:last-child { margin-bottom: 0; }
.sm-ai-status .ai-title {
  display: block;
  margin: 11px 0 4px;
  font-size: 13px;
  font-weight: 700;
  color: var(--sm-blue);
}
.sm-ai-status .ai-title:first-child { margin-top: 0; }
.sm-ai-status.is-loading { color: var(--sm-ink-3); }
.sm-ai-status.is-error { color: #a8452f; border-left-color: #c2593f; background: #fdf0ea; }
:root[data-theme="dark"] .sm-ai-status.is-error { color: #ffbda8; background: #2a1812; }

/* ---------- 右侧工艺卡 ---------- */
.sm-card {
  position: sticky;
  top: 80px;
  background: var(--sm-card);
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  box-shadow: var(--sm-shadow);
  overflow: hidden;
}
.sm-card-head {
  padding: 14px 18px 12px;
  background: linear-gradient(160deg, #143a51, #0c2434);
  border-bottom: 3px solid var(--sm-orange);
  color: #e6f2f9;
}
.sm-card-head > span {
  font-family: var(--sm-mono);
  font-size: 10px;
  letter-spacing: .15em;
  color: rgba(230, 242, 249, .55);
}
.sm-card-head h2 { font-size: 16.5px; margin-top: 4px; }
.sm-card-head em {
  display: block;
  margin-top: 3px;
  font-style: normal;
  font-size: 11px;
  color: rgba(230, 242, 249, .64);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sm-card-flat {
  padding: 14px 18px 12px;
  background: var(--sm-paper);
  border-bottom: 1px solid var(--sm-line-2);
}
.sm-card-flat > span { font-size: 10.5px; letter-spacing: .08em; color: var(--sm-ink-3); }
.sm-card-num b {
  font-family: var(--sm-mono);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -.045em;
  line-height: 1.1;
  color: var(--sm-blue);
}
.sm-card-num em { font-style: normal; margin-left: 4px; font-size: 11px; color: var(--sm-ink-3); }
.sm-card-sub { margin-top: 3px; font-size: 11px; color: var(--sm-ink-3); font-family: var(--sm-mono); }
.sm-card-sub i { font-style: normal; color: var(--sm-ink-2); }

.sm-card-rows { list-style: none; margin: 0; padding: 8px 18px 4px; }
.sm-card-rows li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--sm-line-2);
  font-size: 12.5px;
}
.sm-card-rows li:last-child { border-bottom: 0; }
.sm-card-rows span { color: var(--sm-ink-3); }
.sm-card-rows b { font-family: var(--sm-mono); font-size: 13px; font-weight: 600; color: var(--sm-ink); }
.sm-card-rows li.sum b { color: var(--sm-blue); font-size: 14px; }

.sm-card-total {
  margin: 6px 14px 0;
  padding: 12px 14px 13px;
  border-radius: 6px;
  background: linear-gradient(140deg, #15394f, #0b2231);
  color: #e6f2f9;
}
.sm-card-total > span { font-size: 10.5px; letter-spacing: .07em; color: rgba(230, 242, 249, .6); }
.sm-total-num b {
  font-family: var(--sm-mono);
  font-size: 27px;
  font-weight: 700;
  letter-spacing: -.04em;
  color: #9fe2fb;
}
.sm-total-sub { margin-top: 3px; font-size: 11px; color: rgba(230, 242, 249, .62); }
.sm-total-sub i { font-style: normal; font-family: var(--sm-mono); color: rgba(230, 242, 249, .9); }

.sm-page .sm-hint {
  margin: 12px 18px 0;
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--sm-ink-3);
  padding-left: 10px;
  border-left: 2px solid var(--sm-orange);
}
.sm-page .sm-hint.is-alert { color: #a8452f; border-left-color: #c2593f; }
:root[data-theme="dark"] .sm-page .sm-hint.is-alert { color: #ffbda8; }

/* ---------- 内联 SVG 线稿 ---------- */
.sm-ink-line { fill: none; stroke: var(--sm-blue); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.sm-ink-fill { fill: var(--sm-blue-soft); stroke: none; }
.sm-ink-band { fill: var(--sm-band); stroke: none; }
.sm-ink-part { fill: var(--sm-paper); stroke: var(--sm-cyan); stroke-width: .7; stroke-opacity: .55; }
.sm-ink-dash { fill: none; stroke: var(--sm-orange); stroke-width: 1.2; stroke-dasharray: 4 4; }
.sm-ink-text { fill: var(--sm-ink-3); font-family: var(--sm-mono); font-size: 9px; }
.sm-ink-label { fill: var(--sm-blue); font-family: var(--sm-mono); font-size: 10.5px; font-weight: 600; }
.sm-plate-line { fill: none; stroke: #79cbe8; stroke-linecap: round; stroke-linejoin: round; }
.sm-plate-dot { fill: #e6a15a; stroke: none; }
.sm-plate-text { fill: #a8c9de; font-family: var(--sm-mono); font-size: 9px; }
.sm-plate-label { fill: #8fdcf8; font-family: var(--sm-mono); font-size: 10px; font-weight: 600; }

.sm-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 13px 18px 17px;
}
.sm-actions .sm-btn { padding: 9px 12px; font-size: 12.5px; }
.sm-actions .sm-btn:first-child { grid-column: 1 / -1; }

/* ---------- 文档区 ---------- */
.sm-docs { margin-top: 46px; }
.sm-docs-head { max-width: 780px; }
.sm-docs-head h2 { font-size: clamp(21px, 2.4vw, 27px); letter-spacing: -.02em; }
.sm-docs-head p { margin-top: 10px; font-size: 13.5px; line-height: 1.85; color: var(--sm-ink-2); }

.sm-docs-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}
.sm-doc {
  background: var(--sm-card);
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  padding: 20px 22px;
  box-shadow: var(--sm-shadow);
}
.sm-doc.wide { grid-column: 1 / -1; }
.sm-doc h3 {
  font-size: 15px;
  color: var(--sm-ink);
  padding-bottom: 9px;
  margin-bottom: 11px;
  border-bottom: 1px solid var(--sm-line-2);
}
.sm-doc p { font-size: 13px; line-height: 1.9; color: var(--sm-ink-2); margin-bottom: 9px; }
.sm-doc p:last-child { margin-bottom: 0; }
.sm-doc b { color: var(--sm-ink); font-weight: 600; }

.sm-doc-table { margin: 12px 0 2px; overflow-x: auto; border: 1px solid var(--sm-line); border-radius: 5px; }
.sm-doc-table table { width: 100%; border-collapse: collapse; font-size: 12.5px; min-width: 480px; }
.sm-doc-table th {
  text-align: left;
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--sm-ink-3);
  background: var(--sm-paper);
  padding: 8px 12px;
  border-bottom: 1px solid var(--sm-line);
  white-space: nowrap;
}
.sm-doc-table td { padding: 8px 12px; border-bottom: 1px solid var(--sm-line-2); color: var(--sm-ink-2); font-family: var(--sm-mono); font-size: 12px; }
.sm-doc-table td:first-child { font-family: var(--sm-sans); color: var(--sm-ink); font-weight: 600; white-space: nowrap; }
.sm-doc-table tbody tr:last-child td { border-bottom: 0; }

.sm-faq { display: grid; gap: 8px; }
.sm-faq details {
  border: 1px solid var(--sm-line-2);
  border-radius: 5px;
  background: var(--sm-paper);
  overflow: hidden;
}
.sm-faq summary {
  cursor: pointer;
  list-style: none;
  padding: 11px 14px 11px 32px;
  font-size: 13px;
  font-weight: 600;
  color: var(--sm-ink);
  position: relative;
}
.sm-faq summary::-webkit-details-marker { display: none; }
.sm-faq summary::before {
  content: "+";
  position: absolute;
  left: 13px;
  top: 10px;
  font-family: var(--sm-mono);
  font-size: 14px;
  color: var(--sm-orange);
}
.sm-faq details[open] summary::before { content: "−"; }
.sm-faq-body {
  padding: 0 14px 12px 32px;
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--sm-ink-2);
}

.sm-note {
  margin-top: 18px;
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--sm-ink-3);
  border-left: 2px solid var(--sm-line);
  padding-left: 11px;
}

/* ---------- 深色微调 ---------- */
:root[data-theme="dark"] .sm-block-head {
  background: linear-gradient(180deg, #14293a, var(--sm-card));
}
:root[data-theme="dark"] .sm-plate {
  border-color: rgba(79, 182, 216, .26);
}
:root[data-theme="dark"] .sm-chips button.on { color: #04121a; }

/* ---------- 响应式 ---------- */
@media (max-width: 1120px) {
  .sm-hero { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .sm-plate { max-width: 560px; }
  .sm-shell { grid-template-columns: minmax(0, 1fr); }
  .sm-card { position: static; }
  .sm-ai { grid-template-columns: minmax(0, 1fr); }
  .sm-btn.ai { justify-self: start; }
}

@media (max-width: 860px) {
  .sm-grid { grid-template-columns: minmax(0, 1fr); }
  .sm-grid.three { grid-template-columns: minmax(0, 1fr); }
  .sm-legs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm-legsum { grid-template-columns: minmax(0, 1fr); }
  .sm-sheet { grid-template-columns: minmax(0, 1fr); }
  .sm-readout { grid-template-columns: minmax(0, 1fr); }
  .sm-docs-grid { grid-template-columns: minmax(0, 1fr); }
  .sm-sub-head p, .sm-bend-head p { margin-left: 0; }
}

@media (max-width: 560px) {
  .sm-wrap { padding: 0 14px; }
  .sm-hero { padding: 18px 0 28px; }
  .sm-hero h1 { font-size: 27px; }
  .sm-sub { font-size: 13.5px; }
  .sm-hero-tags span { font-size: 11px; }
  .sm-block-head { padding: 14px 15px 12px; }
  .sm-block-body { padding: 15px 15px 17px; }
  .sm-legs { grid-template-columns: minmax(0, 1fr); }
  .sm-plate-dims b { font-size: 17px; }
  .sm-plate-big b { font-size: 29px; }
  .sm-plate-foot { flex-direction: column; align-items: flex-start; gap: 10px; }
  .sm-plate-mini { text-align: left; grid-template-columns: 1fr 1fr; width: 100%; }
  .sm-readout-main b { font-size: 26px; }
  .sm-sheet-stats { grid-template-columns: minmax(0, 1fr); }
  .sm-doc { padding: 17px 16px; }
  .sm-ai { padding: 16px; }
  .sm-btn.ai { width: 100%; }
  .sm-card-flat { padding: 13px 15px 11px; }
  .sm-card-rows { padding: 6px 15px 3px; }
  .sm-card-total { margin: 6px 12px 0; }
  .sm-page .sm-hint { margin: 11px 15px 0; }
  .sm-actions { padding: 12px 15px 15px; }
  .sm-batch-count { width: 100%; margin-left: 0; }
}