:root {
  --primary: #4f7cff;
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #1f2733;
  --muted: #8794a6;
  --border: #e6eaf2;
  --warn: #f0a500;
  --danger: #e4572e;
  --ok: #36c2a6;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
}
.topbar {
  display: flex; align-items: center; gap: 20px;
  padding: 12px 20px; background: var(--card);
  border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; font-size: 18px; color: var(--primary); }
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav a {
  text-decoration: none; color: var(--muted); padding: 6px 12px;
  border-radius: 8px; font-size: 14px;
}
.nav a.active { background: var(--primary); color: #fff; }
.container { max-width: 880px; margin: 0 auto; padding: 20px; }

/* ===== 深空背景（仅 dashboard 路线，由 body.space 控制） ===== */
#space { position: fixed; inset: 0; width: 100%; height: 100%; display: none; pointer-events: none; z-index: 0; }
body.space { background: #04060f url('assets/space-bg.jpg') center/cover no-repeat fixed; }
body.space #space { display: block; }
body.space #app { position: relative; z-index: 1; }
body.space h1 { color: #eaf0ff; text-shadow: 0 2px 14px rgba(0,0,0,.55); }
body.space .muted { color: #aab6d4; }
body.space .topbar {
  background: rgba(10,16,34,.66); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom-color: rgba(120,160,255,.22);
}
body.space .brand { color: #9cc4ff; }
body.space .nav a { color: #b9c6e8; }
body.space .nav a.active { background: #3a63d6; color: #fff; }
body.space .card, body.space .stat { box-shadow: 0 8px 30px rgba(0,0,0,.35); }

/* ===== 成绩看板（iframe 全宽内嵌） ===== */
.container.scoreboard { max-width: none; width: 100%; padding: 0; margin: 0; position: relative; }
.container.scoreboard #sb-frame { width: 100%; height: calc(100vh - 56px); border: 0; display: block; background: #070b16; }
.sb-loading { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: #9fb3e0; font-size: 15px; z-index: 2; pointer-events: none; }
.sb-error { max-width: 720px; margin: 36px auto 0; padding: 16px 20px; border: 1px solid rgba(255,107,138,.4); background: rgba(255,107,138,.08); border-radius: 14px; color: #ffd0d8; font-size: 14px; line-height: 1.75; }
.sb-error code { background: rgba(255,255,255,.1); padding: 1px 6px; border-radius: 5px; font-size: 12px; }
h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 16px; margin: 0 0 12px; }
h3 { font-size: 14px; margin: 16px 0 8px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.muted { color: var(--muted); font-size: 13px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; text-align: center; }
.stat-num { font-size: 26px; font-weight: 700; color: var(--primary); }
.stat-label { color: var(--muted); font-size: 13px; }
.row { display: flex; align-items: center; gap: 10px; margin: 6px 0; }
.row-name { width: 56px; font-size: 13px; color: var(--muted); flex-shrink: 0; }
.bar { position: relative; flex: 1; height: 22px; background: #eef1f7; border-radius: 6px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 6px; transition: width .3s; }
.bar-label { position: absolute; right: 8px; top: 0; line-height: 22px; font-size: 12px; color: #2b3748; }
.form { display: flex; flex-direction: column; gap: 10px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
input, select, textarea {
  font: inherit; padding: 8px 10px; border: 1px solid var(--border);
  border-radius: 8px; background: #fff; color: var(--text); width: 100%;
}
textarea { resize: vertical; }
.btn {
  align-self: flex-start; background: var(--primary); color: #fff; border: none;
  padding: 9px 18px; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.btn:hover { filter: brightness(1.05); }
.btn-del { background: none; border: 1px solid var(--danger); color: var(--danger); padding: 4px 10px; border-radius: 6px; cursor: pointer; font-size: 12px; }
.hint { font-size: 12px; color: var(--primary); background: #eef3ff; padding: 6px 10px; border-radius: 6px; }
.badge { display: inline-block; font-size: 11px; background: #eef1f7; color: var(--muted); padding: 2px 8px; border-radius: 10px; }
.badge.warn { background: #fff3df; color: var(--warn); }
.wrong-item { border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-bottom: 10px; }
.wrong-head { font-size: 13px; margin-bottom: 4px; }
.wrong-body { font-size: 14px; white-space: pre-wrap; }
.preview { max-width: 200px; border-radius: 8px; margin-top: 8px; display: block; }
.preview.sm { max-width: 120px; }
.similar { background: #f4f8ff; border-left: 3px solid var(--primary); padding: 8px 10px; border-radius: 6px; margin: 6px 0; font-size: 13px; }
.weak { background: #fff6f3; border-left: 3px solid var(--danger); padding: 8px 10px; border-radius: 6px; margin: 6px 0; font-size: 13px; }
.q { border-bottom: 1px solid var(--border); padding: 10px 0; }
.q-title { font-size: 14px; margin-bottom: 6px; }
.q-opts { display: flex; flex-wrap: wrap; gap: 12px; }
.opt { font-size: 13px; color: var(--text); display: inline-flex; align-items: center; gap: 4px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 6px; }
.tbl th, .tbl td { border: 1px solid var(--border); padding: 6px 8px; text-align: left; }
.tbl th { background: #f4f7fc; }
.tasks { list-style: none; padding: 0; margin: 0; }
.task { padding: 6px 0; font-size: 14px; }
.task.done { color: var(--muted); text-decoration: line-through; }
.chks { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.chk { font-size: 13px; display: inline-flex; align-items: center; gap: 4px; }
code { background: #eef1f7; padding: 1px 5px; border-radius: 4px; font-size: 12px; }
@media (max-width: 600px) {
  .grid { grid-template-columns: 1fr; }
  .nav a { padding: 6px 8px; font-size: 13px; }
}
.qa-thread { border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-bottom: 10px; }
.qa-q { font-size: 14px; }
.qa-a { font-size: 14px; background: #f4f8ff; border-left: 3px solid var(--primary); padding: 8px 10px; border-radius: 6px; margin-top: 6px; }
.qa-step { margin: 4px 0; }
.rec-card { border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-bottom: 10px; }
.rec-card h3 { margin: 0 0 6px; }
.rec-prac { background: #f4f8ff; border-left: 3px solid var(--primary); padding: 6px 10px; border-radius: 6px; margin: 4px 0; font-size: 13px; }
.rec-tip { background: #f3fbf7; border-left: 3px solid var(--ok); padding: 6px 10px; border-radius: 6px; margin: 4px 0; font-size: 13px; }
.report-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.report-stat { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; text-align: center; }
.report-stat .n { font-size: 22px; font-weight: 700; color: var(--primary); }
.auth-banner { background: #fff3df; border: 1px solid var(--warn); color: #8a5a00; padding: 10px 12px; border-radius: 8px; font-size: 13px; margin-bottom: 12px; }
@media (max-width: 600px){ .report-grid { grid-template-columns: 1fr; } }
.btn-sm { align-self: flex-start; background: #eef3ff; color: var(--primary); border: 1px solid #d6e0ff; padding: 3px 10px; border-radius: 6px; cursor: pointer; font-size: 12px; }
.btn-sm:hover { filter: brightness(0.98); }
.list-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.print-bar { display: flex; align-items: center; gap: 8px; }

/* 数据备份 / 恢复 */
.backup-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.btn-outline { background: var(--card); color: var(--primary); border: 1px solid var(--primary); padding: 8px 14px; border-radius: 8px; font-size: 14px; display: inline-block; }
.btn-outline:hover { background: #eef3ff; }
.bk-mode { font-size: 13px; color: var(--muted, #666); display: inline-flex; align-items: center; gap: 4px; }
.print-bar select { padding: 5px 8px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px; background: var(--card); color: inherit; }
.rest-banner { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 999; background: #fff8e8; border: 1px solid var(--warn); color: #8a5a00; padding: 12px 18px; border-radius: 12px; box-shadow: 0 6px 24px rgba(0,0,0,.12); font-size: 14px; display: flex; align-items: center; gap: 10px; max-width: 92vw; }
.en-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; flex-wrap: wrap; }
.en-idx { width: 20px; color: var(--muted); flex-shrink: 0; }
.en-text { font-weight: 600; }
.en-rec-out { margin-top: 10px; font-size: 14px; background: #f4f8ff; border-left: 3px solid var(--primary); padding: 8px 10px; border-radius: 6px; }

/* ---------- 启动欢迎屏 / 隐私锁 ---------- */
#splash {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: center; padding: 20px;
  background: linear-gradient(135deg, #4f7cff 0%, #7aa0ff 55%, #a9c0ff 100%);
}
#splash.modal { background: rgba(20, 30, 50, .5); }
.splash-card {
  background: #fff; border-radius: 20px; padding: 32px 28px; width: 100%;
  max-width: 340px; text-align: center; box-shadow: 0 20px 60px rgba(0, 0, 0, .25);
}
.splash-logo { font-size: 40px; font-weight: 800; color: var(--primary); letter-spacing: 2px; }
.splash-logo.small { font-size: 22px; margin-bottom: 10px; }
.splash-sub { color: var(--muted); font-size: 14px; margin: 4px 0 18px; }
.splash-quote {
  background: #eef3ff; color: var(--primary); border-radius: 12px;
  padding: 12px 14px; font-size: 15px; margin-bottom: 22px; line-height: 1.5;
}
.splash-enter {
  width: 100%; background: var(--primary); color: #fff; border: none;
  padding: 13px; border-radius: 12px; font-size: 16px; cursor: pointer;
}
.splash-enter:hover { filter: brightness(1.05); }
.splash-link {
  display: block; margin-top: 14px; color: var(--muted); font-size: 13px;
  background: none; border: none; cursor: pointer; width: 100%;
}
.splash-link:hover { color: var(--primary); }
.splash-foot { margin-top: 16px; color: var(--muted); font-size: 12px; }
.splash-lock-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; }
.splash-lock-title.err { color: var(--danger); }
.pin-dots { display: flex; gap: 14px; justify-content: center; margin-bottom: 20px; }
.pin-dots .dot { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--primary); }
.pin-dots .dot.on { background: var(--primary); }
.pin-pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; max-width: 240px; margin: 0 auto; }
.pin-key {
  background: #f2f5fb; border: none; border-radius: 12px; height: 54px;
  font-size: 22px; color: var(--text); cursor: pointer;
}
.pin-key:active { background: #e2e8f5; }
.pin-key.del { color: var(--muted); font-size: 18px; }
.pin-key.blank { visibility: hidden; }

/* ---------- 多孩子档案门禁 ---------- */
.child-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.child-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border: 1px solid #e2e8f5; border-radius: 12px;
  background: #fff; cursor: pointer; font-size: 15px; text-align: left;
}
.child-item:hover { border-color: var(--primary); }
.child-avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: inline-flex; align-items: center; justify-content: center; font-weight: 700;
}
.child-name { flex: 1; }
.child-lock { font-size: 14px; }
.splash-child-tag {
  display: inline-block; margin: 6px 0 14px; padding: 4px 12px;
  border-radius: 999px; background: rgba(59,130,246,.12); color: var(--primary); font-size: 14px;
}
.text-input {
  width: 100%; padding: 10px 12px; border: 1px solid #e2e8f5; border-radius: 10px;
  font-size: 15px; box-sizing: border-box; margin-bottom: 6px;
}
.text-input:focus { outline: none; border-color: var(--primary); }