:root {
  --bg: #eef7f0;
  --bg2: #f7fbf7;
  --card: #ffffff;
  --ink: #2c4a36;
  --muted: #6f8f7a;
  --green: #76bf8a;
  --green-deep: #4e9164;
  --green-soft: #e2f3e7;
  --green-line: #cfe8d6;
  --shadow: 0 10px 30px rgba(86, 148, 104, 0.12);
  --radius: 18px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  min-height: 100vh;
  background: linear-gradient(160deg, var(--bg), var(--bg2));
  color: var(--ink);
  padding-bottom: 40px;
}

/* ---------- 顶部栏 ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 760px; margin: 0 auto; padding: 20px 20px 6px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-name { font-size: 24px; font-weight: 700; letter-spacing: 1px; }
.auth { display: flex; gap: 10px; align-items: center; }
.top-right { display: flex; align-items: center; gap: 10px; }
.lang-btn { display: inline-flex; align-items: center; gap: 4px; }
.user-name { color: var(--green-deep); font-weight: 600; font-size: 14px; }

/* ---------- 主区域 ---------- */
.wrap { width: 100%; max-width: 760px; margin: 12px auto; padding: 0 20px; }

.card {
  background: var(--card);
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  margin-bottom: 16px;
}

.clock-card { text-align: center; position: relative; }
.tz-label { color: var(--muted); font-size: 14px; margin-bottom: 14px; }

.time-row { font-variant-numeric: tabular-nums; font-weight: 700; line-height: 1; }
#clock-main { font-size: 84px; letter-spacing: 2px; }
#clock-ms { font-size: 30px; color: var(--green-deep); }

.date { margin-top: 12px; font-size: 17px; color: var(--muted); }

.controls {
  display: flex; align-items: center; justify-content: center;
  gap: 12px; flex-wrap: wrap; margin-top: 24px;
}
.precision { display: flex; align-items: center; gap: 6px; }
.precision > span { color: var(--muted); font-size: 13px; margin-right: 2px; }

.chip {
  border: 1px solid var(--green-line); background: var(--green-soft);
  color: var(--ink); border-radius: 999px; padding: 7px 16px;
  font-size: 13px; cursor: pointer; transition: all .15s;
}
.chip:hover { border-color: var(--green); }
.chip.active { background: var(--green); color: #fff; border-color: var(--green); }
.chip--ghost { background: #fff; }

.calibrate {
  display: flex; align-items: center; justify-content: center;
  gap: 12px; margin-top: 18px; color: var(--muted); font-size: 13px;
}
.diff { font-variant-numeric: tabular-nums; }

.stats-card { display: flex; justify-content: space-around; padding: 20px 28px; }
.stat { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.stat b { font-size: 22px; color: var(--green-deep); font-variant-numeric: tabular-nums; }
.stat span { font-size: 12px; color: var(--muted); }

/* ---------- 时区详情 ---------- */
.detail-card h2, .world-card h2 {
  font-size: 16px; margin-bottom: 14px; color: var(--ink);
}
.detail-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px;
}
.detail-grid div { background: var(--green-soft); border-radius: 12px; padding: 10px 14px; }
.detail-grid span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.detail-grid b { font-size: 14px; }

/* ---------- 世界城市 ---------- */
.world-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.city-card {
  border: 1px solid var(--green-line); border-radius: 14px; padding: 14px;
  background: #fff;
}
.city-card .c-name { font-size: 14px; font-weight: 600; }
.city-card .c-time { font-size: 20px; font-variant-numeric: tabular-nums; color: var(--green-deep); margin-top: 6px; }
.city-card .c-date { font-size: 12px; color: var(--muted); margin-top: 4px; }
.city-card .c-diff { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ---------- 每日剩余访问次数小方块 ---------- */
.quota-badge {
  position: absolute; top: 14px; right: 16px;
  min-width: 68px; height: 58px; padding: 6px 10px;
  background: var(--green-soft); border: 1px solid var(--green-line);
  border-radius: 14px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px;
}
.quota-badge .qb-label { font-size: 11px; color: var(--muted); }
.quota-badge .qb-val {
  font-size: 18px; font-weight: 700; color: var(--green-deep);
  font-variant-numeric: tabular-nums;
}
.quota-badge.limited { background: #fdecea; border-color: #f2c3bd; }
.quota-badge.limited .qb-val { color: #d9534f; }

.clock-limit {
  margin-top: 18px; font-size: 20px; font-weight: 700; color: #d9534f;
}

/* ---------- 联系作者 ---------- */
.contact-card { text-align: center; }
.contact-item {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 10px; font-size: 15px; color: var(--ink);
}
.contact-icon { font-size: 18px; }
.contact-mail { color: var(--green-deep); text-decoration: none; font-weight: 600; }
.contact-mail:hover { text-decoration: underline; }

/* ---------- 版权 ---------- */
.copyright {
  text-align: center; color: var(--muted);
  font-size: 12px; margin-top: 16px;
}

/* ---------- 登录弹窗 ---------- */
.modal-mask {
  position: fixed; inset: 0; background: rgba(40, 70, 50, 0.35);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal {
  width: 340px; max-width: calc(100vw - 32px);
  background: #fff; border-radius: 18px; padding: 22px;
  box-shadow: 0 20px 50px rgba(0,0,0,.18);
}
.modal-head { display: flex; align-items: center; justify-content: space-between; font-size: 18px; font-weight: 700; }
.modal-close { border: none; background: none; font-size: 24px; cursor: pointer; color: var(--muted); }
.tabs { display: flex; gap: 6px; margin: 16px 0 4px; }
.tab { flex: 1; border: 1px solid var(--green-line); background: #fff; padding: 8px; border-radius: 10px; cursor: pointer; color: var(--muted); }
.tab.active { background: var(--green-soft); color: var(--ink); border-color: var(--green); font-weight: 600; }
#auth-form { display: flex; flex-direction: column; gap: 12px; margin-top: 12px; }
#auth-form label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
#auth-form input {
  border: 1px solid var(--green-line); border-radius: 10px; padding: 10px 12px; font-size: 14px;
}
#auth-form input:focus { outline: none; border-color: var(--green); }
.auth-msg { min-height: 18px; font-size: 13px; color: #d9534f; }
.btn-primary {
  border: none; background: var(--green); color: #fff; padding: 11px; border-radius: 10px;
  font-size: 15px; cursor: pointer;
}
.btn-primary:hover { background: var(--green-deep); }

/* ---------- 全屏 ---------- */
body.fullscreen { padding: 0; }
body.fullscreen .wrap {
  max-width: none; display: flex; flex-direction: column; align-items: center;
  justify-content: center; height: 100vh; gap: 30px;
}
body.fullscreen .topbar, body.fullscreen .stats-card,
body.fullscreen .detail-card, body.fullscreen .world-card,
body.fullscreen .calibrate,
body.fullscreen .quota-badge, body.fullscreen .contact-card,
body.fullscreen .copyright { display: none; }
body.fullscreen .clock-card { order: 0; box-shadow: none; border: none; background: transparent; }
body.fullscreen #clock-main { font-size: 10vw; }
body.fullscreen #clock-ms { font-size: 3vw; }
body.fullscreen .date { font-size: 2.5vw; }

@media (max-width: 520px) {
  .topbar { padding: 14px 14px 4px; flex-wrap: wrap; gap: 6px; }
  .brand-name { font-size: 20px; }
  .wrap { padding: 0 14px; }
  #clock-main { font-size: 52px; letter-spacing: 1px; }
  #clock-ms { font-size: 22px; }
  .date { font-size: 15px; }
  .card { padding: 18px 16px; }
  .stats-card { padding: 16px 10px; }
  .stat b { font-size: 18px; }
  .quota-badge { top: 10px; right: 12px; min-width: 60px; height: 52px; }
  .modal { padding: 18px; }
}

@media (max-width: 360px) {
  #clock-main { font-size: 44px; letter-spacing: 0; }
  #clock-ms { font-size: 18px; }
  .tz-label { font-size: 12px; }
  .chip { padding: 6px 12px; font-size: 12px; }
  .contact-mail { font-size: 13px; }
}