/* 学习守护 · 家长控制台（深色主题，与 App 端一致） */
:root {
  --bg: #0F2027;
  --bg2: #1A2C35;
  --card: #16323E;
  --card2: #1E3A46;
  --stroke: #2C4A57;
  --text: #FFFFFF;
  --text2: #8FA6B3;
  --dim: #5A707D;
  --accent: #4FD1C5;
  --warn: #FFB74D;
  --danger: #FF8A65;
  --ok: #4FD1C5;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(135deg, var(--bg) 0%, var(--bg2) 100%);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }
.page { min-height: 100vh; }

/* ---- 登录页 ---- */
.auth-box {
  max-width: 380px;
  margin: 0 auto;
  padding: 60px 28px;
  display: flex; flex-direction: column; align-items: center;
}
.auth-box .logo { font-size: 64px; margin-bottom: 8px; }
.auth-box h1 { font-size: 28px; font-weight: 700; }
.auth-box .sub { color: var(--text2); margin: 6px 0 36px; font-size: 14px; }
#auth-form { width: 100%; display: flex; flex-direction: column; gap: 14px; }
#auth-form input {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  color: var(--text);
  outline: none;
}
#auth-form input:focus { border-color: var(--accent); }
.auth-hint { margin-top: 18px; font-size: 12px; color: var(--dim); text-align: center; }
.auth-err { margin-top: 12px; font-size: 14px; color: var(--danger); min-height: 18px; text-align: center; }

/* ---- 按钮 ---- */
.btn {
  padding: 12px 20px;
  font-size: 15px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: opacity .15s, transform .05s;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: #08221F; font-weight: 600; }
.btn-ghost { background: transparent; color: var(--text2); border: 1px solid var(--stroke); }
.btn-danger { background: var(--danger); color: #2A0E05; font-weight: 600; }
.btn-block { width: 100%; }
.btn-small { padding: 8px 14px; font-size: 13px; border-radius: 10px; }
.btn-icon {
  background: transparent; border: none; color: var(--text2);
  font-size: 20px; cursor: pointer; padding: 6px 10px;
}
.btn[disabled] { opacity: .5; }

/* ---- 顶栏 ---- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  background: rgba(15, 32, 39, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--stroke);
}
.topbar-title { font-size: 17px; font-weight: 700; }

/* ---- 内容区 ---- */
.content { padding: 18px 16px 90px; max-width: 720px; margin: 0 auto; }

.card {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 18px;
  margin-bottom: 14px;
}
.card h2 { font-size: 16px; margin-bottom: 14px; color: var(--text); }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.grow { flex: 1; min-width: 0; }
input[type="text"], input[type="password"] {
  padding: 10px 12px;
  font-size: 15px;
  background: var(--card2);
  border: 1px solid var(--stroke);
  border-radius: 10px;
  color: var(--text);
  outline: none;
  width: 100%;
}
input[type="text"]:focus { border-color: var(--accent); }

/* ---- 添加设备结果 ---- */
.pair-box { margin-top: 14px; background: var(--card2); border-radius: 12px; padding: 14px; }
.pair-box p { font-size: 14px; color: var(--text2); margin-bottom: 10px; }
.pair-box .hint { margin-top: 10px; margin-bottom: 12px; font-size: 13px; }
.pair-box .hint b { color: var(--warn); font-size: 16px; letter-spacing: 2px; }
.cmd {
  background: #0A161C;
  border-radius: 10px;
  padding: 12px;
  font-size: 12px;
  color: var(--accent);
  word-break: break-all;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  margin-bottom: 4px;
}

/* ---- 设备卡片 ---- */
.device-card { background: var(--card); border: 1px solid var(--stroke); border-radius: 16px; margin-bottom: 14px; overflow: hidden; }
.device-head {
  display: flex; align-items: center; gap: 10px;
  padding: 16px 18px 10px;
}
.device-name { font-size: 17px; font-weight: 700; flex: 1; }
.online-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--dim); flex-shrink: 0; }
.online-dot.on { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.device-model { font-size: 12px; color: var(--dim); padding: 0 18px 8px; }

.device-state {
  display: flex; align-items: baseline; gap: 10px;
  padding: 8px 18px 14px;
  border-bottom: 1px solid var(--stroke);
}
.state-time { font-size: 40px; font-family: "SF Mono", Menlo, monospace; font-weight: 700; letter-spacing: 1px; }
.state-time.ok { color: var(--ok); }
.state-time.warn { color: var(--warn); }
.state-time.danger { color: var(--danger); }
.state-label { font-size: 13px; color: var(--text2); }

.device-actions { padding: 14px 18px; display: flex; flex-direction: column; gap: 12px; }
.action-row { display: flex; gap: 10px; flex-wrap: wrap; }
.action-row .btn { flex: 1; min-width: 80px; }

/* 快捷发放 */
.grant-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  padding: 10px 16px;
  background: var(--card2);
  border: 1px solid var(--stroke);
  border-radius: 999px;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
}
.chip:active { background: var(--accent); color: #08221F; border-color: var(--accent); }

/* 白名单管理 */
.wl-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.wl-item {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--card2); border-radius: 10px; padding: 10px 14px; font-size: 14px;
}
.wl-item .rm { color: var(--danger); cursor: pointer; font-size: 18px; padding: 0 4px; }
.wl-add { display: flex; gap: 8px; margin-top: 10px; }

/* 设置项 */
.setting-row { display: flex; align-items: center; justify-content: space-between; padding: 10px 0; font-size: 14px; border-bottom: 1px solid rgba(44,74,87,.5); }
.setting-row:last-child { border-bottom: none; }
.setting-row .lbl { color: var(--text2); }
.setting-row input { width: 130px; text-align: right; padding: 8px 10px; font-size: 14px; }
.switch {
  position: relative; width: 46px; height: 26px; flex-shrink: 0;
  background: var(--card2); border: 1px solid var(--stroke);
  border-radius: 999px; cursor: pointer; transition: background .2s;
}
.switch::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--dim); transition: left .2s, background .2s;
}
.switch.on { background: rgba(79,209,197,.25); border-color: var(--accent); }
.switch.on::after { left: 22px; background: var(--accent); }

/* 命令记录 */
.cmd-log { margin-top: 10px; font-size: 13px; color: var(--dim); max-height: 160px; overflow-y: auto; }
.cmd-log-item { padding: 6px 0; border-bottom: 1px solid rgba(44,74,87,.4); display: flex; gap: 8px; align-items: center; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 999px; }
.badge.pending { background: rgba(255,183,77,.15); color: var(--warn); }
.badge.delivered { background: rgba(79,209,197,.15); color: var(--accent); }
.badge.acked { background: rgba(143,166,179,.15); color: var(--text2); }
.badge.expired { background: rgba(255,138,101,.15); color: var(--danger); }

/* 折叠区 */
.collapse-head {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; padding: 4px 0; user-select: none;
}
.collapse-head .arrow { transition: transform .2s; color: var(--dim); font-size: 12px; }
.collapse.open .arrow { transform: rotate(180deg); }
.collapse-body { display: none; padding-top: 12px; }
.collapse.open .collapse-body { display: block; }

/* ---- 悬浮按钮 ---- */
.fab {
  position: fixed; right: 20px; bottom: 28px;
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--accent); color: #08221F;
  font-size: 28px; font-weight: 300;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 20px rgba(79,209,197,.35);
  cursor: pointer; z-index: 20;
  border: none;
}
.fab:active { transform: scale(0.95); }

/* ---- 弹窗 ---- */
.modal-mask {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(0,0,0,.55);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.modal {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 18px;
  padding: 22px;
  width: 100%; max-width: 360px;
}
.modal h3 { font-size: 17px; margin-bottom: 10px; }
.modal p { font-size: 14px; color: var(--text2); line-height: 1.6; }
.modal input { margin-top: 12px; }
.modal-actions { display: flex; gap: 10px; margin-top: 20px; }
.modal-actions .btn { flex: 1; }

/* ---- toast ---- */
.toast {
  position: fixed; left: 50%; bottom: 100px; transform: translateX(-50%);
  background: rgba(30,58,70,.96);
  border: 1px solid var(--stroke);
  color: var(--text);
  padding: 10px 20px; border-radius: 999px;
  font-size: 14px; z-index: 99;
  max-width: 86vw; text-align: center;
  animation: toast-in .2s ease;
}
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ---- 空状态 ---- */
.empty-tip { text-align: center; color: var(--dim); padding: 60px 0; font-size: 14px; }

/* 桌面大屏适配 */
@media (min-width: 768px) {
  .device-actions { flex-direction: row; flex-wrap: wrap; }
  .device-actions > * { flex: 1; min-width: 220px; }
}