/* =========================================================
   简版首页 + 安装引导页样式（深 / 浅双主题）
   ========================================================= */
:root {
  --bg: #0b0e14;
  --bg-soft: #0f141d;
  --panel: #11151f;
  --cell: #1b2231;
  --cell-line: #232b3d;
  --text: #e6eaf2;
  --muted: #8b93a6;
  --accent: #4f8cff;
  --accent-soft: #1b2a4a;
  --ok: #7ef0b0;
  --ok-soft: #12302a;
  --danger: #ff7b7b;
  --danger-soft: #3a1d22;
  --shadow: 0 14px 34px rgba(0, 0, 0, .45);
}
html[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-soft: #eef2f9;
  --panel: #ffffff;
  --cell: #eef2f9;
  --cell-line: #d6dfec;
  --text: #18202f;
  --muted: #66718a;
  --accent: #2f6bd6;
  --accent-soft: #e3edff;
  --ok: #1d8f5f;
  --ok-soft: #e3f7ec;
  --danger: #c93b3b;
  --danger-soft: #fdeaea;
  --shadow: 0 10px 26px rgba(30, 50, 90, .10);
}

* { box-sizing: border-box; }
button, select, input { font-family: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; opacity: .5; }

body {
  margin: 0; padding: 0 0 36px;
  background: radial-gradient(1100px 600px at 50% -20%, rgba(79, 140, 255, .10), transparent 60%), var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  padding: 14px 22px; border-bottom: 1px solid var(--cell-line);
  background: var(--panel); position: sticky; top: 0; z-index: 40;
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 600; font-size: 16px; }
.brand img { width: 26px; height: 26px; border-radius: 7px; }
.brand .ver { font-size: 11.5px; color: var(--muted); font-weight: 400; }
.tools { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  background: transparent; border: 1px solid var(--cell-line); color: var(--text);
  border-radius: 9px; padding: 5px 9px; font-size: 15px; line-height: 1;
}
.icon-btn:hover { border-color: var(--accent); }

/* ---------- 通用 ---------- */
.wrap { max-width: 1040px; margin: 0 auto; padding: 18px 20px 0; display: flex; flex-direction: column; gap: 14px; }
.card {
  background: var(--panel); border: 1px solid var(--cell-line);
  border-radius: 12px; padding: 14px 16px; box-shadow: var(--shadow);
}
.hint { margin: 0; font-size: 12.5px; color: var(--muted); line-height: 1.8; }
.hint b { color: var(--text); }
select {
  background: var(--cell); color: var(--text); border: 1px solid var(--cell-line);
  border-radius: 7px; padding: 4px 7px; font-size: 13px;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--cell); color: var(--text);
  border: 1px solid var(--cell-line); border-radius: 8px;
  padding: 7px 12px; font-size: 13px; text-decoration: none;
  transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; }

/* ---------- 简版矩阵 ---------- */
.simple-slots { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.slot-card {
  background: var(--panel); border: 1px solid var(--cell-line);
  border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 10px;
}
.slot-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.slot-title { color: var(--accent); font-weight: 700; font-size: 16px; }
.dims { display: flex; gap: 8px; }
.dims label { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 4px; }
.slot-actions { margin-left: auto; display: flex; gap: 6px; }
.mini-grid { display: inline-grid; gap: 5px; align-self: flex-start; }
.home-cell {
  width: 58px; height: 44px; text-align: center;
  background: var(--cell); color: var(--text);
  border: 1px solid transparent; border-radius: 7px;
  font-size: 15px; outline: none;
}
.home-cell:focus { border-color: var(--accent); }
.home-cell.invalid { border-color: var(--danger); background: var(--danger-soft); }

/* ---------- 运算 ---------- */
.ops-row { display: flex; flex-wrap: wrap; gap: 8px; }
.ops-row .btn { padding: 8px 13px; font-size: 13.5px; }

/* ---------- 结果 ---------- */
.result-box { min-height: 92px; display: flex; align-items: center; justify-content: center; }
.result-matrix { display: inline-grid; gap: 5px; }
.result-cell {
  min-width: 58px; height: 42px; padding: 0 8px;
  display: flex; align-items: center; justify-content: center;
  background: var(--ok-soft); color: var(--ok);
  border: 1px solid var(--ok); border-radius: 7px;
  font-size: 15px; font-variant-numeric: tabular-nums;
}
.result-scalar { font-size: 28px; color: var(--ok); font-variant-numeric: tabular-nums; }
.placeholder { color: var(--muted); font-size: 13px; }
.error {
  margin-top: 10px; padding: 9px 12px;
  background: var(--danger-soft); color: var(--danger);
  border: 1px solid var(--danger); border-radius: 8px; font-size: 13px;
}

/* ---------- 下载 / 安装区 ---------- */
.download h3 { margin: 0 0 6px; font-size: 15px; }
.download p { margin: 0 0 12px; font-size: 12.5px; color: var(--muted); line-height: 1.8; }
.dl-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.dl-note { margin-top: 10px; font-size: 11.5px; color: var(--muted); }

/* ---------- 安装引导页 ---------- */
.install-grid { display: grid; grid-template-columns: 300px 1fr; gap: 16px; align-items: start; }
.qr-box {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 16px; background: var(--bg-soft);
  border: 1px dashed var(--cell-line); border-radius: 12px;
}
.qr-box svg, .qr-box img { width: 220px; height: 220px; background: #fff; padding: 8px; border-radius: 8px; }
.qr-url {
  font-size: 12px; color: var(--muted); word-break: break-all; text-align: center;
}
.qr-warn { font-size: 12.5px; color: var(--danger); text-align: center; line-height: 1.7; }

.step-list { display: flex; flex-direction: column; gap: 12px; }
.step-card { background: var(--bg-soft); border: 1px solid var(--cell-line); border-radius: 10px; padding: 12px 14px; }
.step-card h4 { margin: 0 0 8px; font-size: 13.5px; }
.step-card ol { margin: 0; padding-left: 20px; font-size: 12.5px; color: var(--muted); line-height: 2; }
.step-card b { color: var(--text); font-weight: 600; }
.step-card .os { font-size: 11.5px; color: var(--accent); }

/* ---------- 响应式 ---------- */
@media (max-width: 820px) {
  .simple-slots { grid-template-columns: 1fr; }
  .install-grid { grid-template-columns: 1fr; }
  .home-cell { width: 46px; height: 38px; font-size: 13px; }
  .wrap { padding: 14px 12px 0; }
  .topbar { padding: 12px 14px; }
}