:root {
  --green: #228b57;
  --green-dark: #1b7446;
  --amber: #b8860b;
  --red: #c0392b;
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #222;
  --dim: #888;
  --border: #e3e7eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

#app { max-width: 520px; margin: 0 auto; min-height: 100vh; }

.hidden { display: none !important; }
.dim { color: var(--dim); }
.center { text-align: center; }
.pad { padding: 24px 12px; }
.spacer { flex: 1; }

header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 5;
}
header .title { font-size: 17px; font-weight: 600; }

/* ---------- 登录 ---------- */
.login-box {
  padding: 72px 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.logo { font-size: 26px; font-weight: 700; text-align: center; }
.sub { text-align: center; margin-bottom: 18px; font-size: 13px; }

input, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px 14px;
  font-size: 16px;
  background: var(--card);
  color: var(--text);
  outline: none;
}
input:focus, textarea:focus { border-color: var(--green); }
.big-input { font-size: 22px; text-align: center; letter-spacing: 8px; }

/* ---------- 按钮 ---------- */
.btn {
  border: none;
  border-radius: 10px;
  padding: 13px 18px;
  font-size: 16px;
  cursor: pointer;
  margin-top: 4px;
}
.btn.primary { background: var(--green); color: #fff; }
.btn.primary:active { background: var(--green-dark); }
.btn.ghost { background: transparent; color: var(--green); border: 1px dashed var(--green); }
.btn.block { display: block; width: 100%; }
.btn:disabled { opacity: .5; }
.link {
  background: none;
  border: none;
  color: var(--green);
  font-size: 14px;
  cursor: pointer;
  padding: 4px;
}

/* ---------- 首页 ---------- */
.cards { display: flex; flex-direction: column; gap: 10px; padding: 14px 16px 6px; }
.device-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}
.device-card:active { background: #f0f4f2; }
.device-card .name { font-size: 17px; font-weight: 600; }
.device-card .arrow { margin-left: auto; color: var(--dim); font-size: 20px; }
.device-card .rename {
  background: none; border: none; color: var(--dim);
  font-size: 16px; cursor: pointer; padding: 8px; margin-left: auto;
}
.device-card .rename + .arrow { margin-left: 0; }

.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.dot.on { background: #2ecc71; box-shadow: 0 0 6px #2ecc71; }
.dot.off { background: #ccc; }

.section-title { padding: 14px 16px 6px; margin: 0; font-size: 15px; }
.history { padding: 0 16px 32px; display: flex; flex-direction: column; gap: 10px; }
.history-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}
.history-item .content { font-size: 15px; line-height: 1.5; word-break: break-all; }
.history-item .meta { display: flex; justify-content: space-between; margin-top: 8px; font-size: 12.5px; align-items: center; }

.state { font-weight: 600; }
.state.read { color: var(--green); }
.state.delivered { color: var(--amber); }
.state.pending { color: var(--red); }

/* ---------- 发送 ---------- */
.hint { font-size: 13px; padding: 10px 16px; }
.hint.warn { color: var(--amber); }
#page-send textarea {
  margin: 6px 16px;
  width: calc(100% - 32px);
  min-height: 110px;
  font-size: 17px;
  line-height: 1.5;
}
.counter { text-align: right; padding: 0 18px 6px; font-size: 12.5px; color: var(--dim); }
#page-send .btn.block { margin: 10px 16px; width: calc(100% - 32px); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 6px 16px; }
.chip {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
}
.chip:active { border-color: var(--green); color: var(--green); }

#send-result { padding: 0 16px; }
.result-box {
  margin-top: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}
.result-box .content { font-size: 15px; word-break: break-all; }
.result-box .state-line { margin-top: 10px; font-size: 15px; }

/* ---------- 弹层 / 提示 ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 24px;
}
.modal-box {
  background: var(--card);
  border-radius: 14px;
  padding: 20px;
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.modal-box h3 { margin: 0 0 -4px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 72px;
  transform: translateX(-50%);
  background: rgba(34, 34, 34, .92);
  color: #fff;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  z-index: 30;
  max-width: 80vw;
  text-align: center;
}

.error { color: var(--red); font-size: 13.5px; text-align: center; min-height: 18px; }