/* ============ 博文信箱 · 公共样式 ============ */
:root {
  --pink: #ff5c8a;
  --pink-deep: #f0416f;
  --pink-soft: #ff8fab;
  --pink-pale: #ffd9e5;
  --bg-top: #ffd9e8;
  --bg-mid: #ffeff5;
  --ink: #5a3d4a;
  --ink-light: #9a7d8a;
  --card: rgba(255, 255, 255, 0.88);
  --shadow: 0 12px 40px rgba(240, 65, 111, 0.14);
  --radius: 22px;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body { height: 100%; }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  color: var(--ink);
  background: linear-gradient(175deg, var(--bg-top) 0%, var(--bg-mid) 45%, #fff8fb 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* 飘浮爱心背景 */
.hearts { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.hearts span {
  position: absolute;
  bottom: -40px;
  color: rgba(255, 122, 158, 0.35);
  font-size: 18px;
  animation-name: floatUp;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes floatUp {
  0%   { transform: translateY(0) rotate(0deg) scale(1); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: .7; }
  100% { transform: translateY(-110vh) rotate(28deg) scale(1.15); opacity: 0; }
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 560px;
  margin: 0 auto;
  padding: 40px 20px 56px;
}

/* ============ 首页头部 ============ */
.header { text-align: center; margin-bottom: 26px; }

.site-title {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: 4px;
  background: linear-gradient(120deg, #ff5c8a 10%, #ff8fab 55%, #c86b98 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 12px rgba(255, 92, 138, 0.12);
}

.site-sub {
  margin-top: 10px;
  color: var(--ink-light);
  font-size: 15px;
  letter-spacing: 1px;
}

.header .seal {
  display: inline-block;
  margin-top: 14px;
  padding: 5px 16px;
  border: 1.5px solid rgba(255, 92, 138, 0.45);
  border-radius: 999px;
  color: var(--pink-deep);
  font-size: 13px;
  letter-spacing: 2px;
  background: rgba(255, 255, 255, 0.5);
}

/* ============ 信纸卡片 ============ */
.letter-card {
  position: relative;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 26px 26px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

/* 右上角邮票装饰 */
.stamp {
  position: absolute;
  top: 18px;
  right: 20px;
  width: 58px;
  height: 68px;
  border: 1.5px dashed rgba(240, 65, 111, 0.5);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(6deg);
  background: rgba(255, 240, 245, 0.7);
}
.stamp svg { width: 34px; height: 30px; }
.stamp::after {
  content: "博文信箱";
  position: absolute;
  bottom: -20px;
  right: 4px;
  font-size: 10px;
  color: var(--ink-light);
  letter-spacing: 2px;
  white-space: nowrap;
}

.to-line { font-size: 17px; margin-bottom: 18px; letter-spacing: 1px; }
.to-line b { color: var(--pink-deep); }

.field { margin-bottom: 18px; }

.field input,
.field textarea {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: var(--ink);
  font-size: 16px;
  font-family: inherit;
}

.field input {
  border-bottom: 1.5px solid var(--pink-pale);
  padding: 10px 2px;
  transition: border-color .25s;
}
.field input:focus { border-bottom-color: var(--pink); }

.field textarea {
  resize: none;
  line-height: 32px;
  height: 288px; /* 9 行信纸 */
  padding: 0 2px;
  background: repeating-linear-gradient(
    transparent, transparent 31px,
    var(--pink-pale) 31px, var(--pink-pale) 32px
  );
  background-attachment: local;
}

.field textarea::placeholder,
.field input::placeholder { color: #c9a9b5; }

.counter {
  text-align: right;
  font-size: 12px;
  color: var(--ink-light);
  margin-top: 6px;
}
.counter.over { color: var(--pink-deep); }

/* 投递按钮 */
.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  height: 54px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--pink-soft), var(--pink) 60%, var(--pink-deep));
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 6px;
  text-indent: 6px;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(240, 65, 111, 0.35);
  transition: transform .18s ease, box-shadow .18s ease, opacity .18s;
}
.send-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(240, 65, 111, 0.4); }
.send-btn:active { transform: scale(.97); }
.send-btn:disabled { opacity: .65; cursor: not-allowed; transform: none; }
.send-btn svg { width: 22px; height: 22px; }

.footer-tip {
  margin-top: 22px;
  text-align: center;
  color: var(--ink-light);
  font-size: 13px;
  letter-spacing: 1px;
  line-height: 1.9;
}

/* ============ 成功弹层 ============ */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(90, 61, 74, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.overlay.show { display: flex; }

.success-card {
  width: min(86vw, 340px);
  background: #fff;
  border-radius: 26px;
  padding: 38px 28px 30px;
  text-align: center;
  animation: pop .45s cubic-bezier(.2, 1.4, .4, 1);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
}
@keyframes pop { from { transform: scale(.6); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.success-card svg { width: 84px; height: 72px; margin-bottom: 16px; }

.success-card h3 { font-size: 21px; color: var(--pink-deep); letter-spacing: 3px; margin-bottom: 10px; }
.success-card p { font-size: 14px; color: var(--ink-light); line-height: 1.8; margin-bottom: 22px; }

.again-btn {
  display: inline-block;
  padding: 12px 34px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--pink-soft), var(--pink));
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 2px;
  cursor: pointer;
}
.again-btn:active { transform: scale(.96); }

/* 通用 toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 48px;
  transform: translateX(-50%) translateY(20px);
  z-index: 99;
  max-width: 82vw;
  padding: 12px 22px;
  background: rgba(90, 61, 74, 0.92);
  color: #fff;
  font-size: 14px;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: all .3s ease;
  text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============ 管理端 ============ */
.admin-wrap { max-width: 760px; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.topbar .site-title { font-size: 26px; }
.topbar-actions { display: flex; gap: 10px; }

.ghost-btn {
  padding: 9px 18px;
  border: 1.5px solid rgba(240, 65, 111, 0.4);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  color: var(--pink-deep);
  font-size: 13.5px;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all .2s;
}
.ghost-btn:hover { background: #fff; border-color: var(--pink); }

.login-card {
  max-width: 380px;
  margin: 60px auto 0;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 30px;
}
.login-card h2 { text-align: center; font-size: 20px; letter-spacing: 3px; margin-bottom: 24px; }
.login-card .field input { background: transparent; }
.login-card .send-btn { margin-top: 8px; }

.stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}
.stat-card {
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 18px 20px;
  text-align: center;
}
.stat-num {
  font-size: 34px;
  font-weight: 800;
  color: var(--pink-deep);
  font-variant-numeric: tabular-nums;
}
.stat-label { margin-top: 4px; font-size: 13px; color: var(--ink-light); letter-spacing: 2px; }

.letter-list { display: flex; flex-direction: column; gap: 14px; }

.mail-item {
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 18px 20px;
}
.mail-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.mail-idx {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(120deg, var(--pink-soft), var(--pink));
  padding: 3px 10px;
  border-radius: 999px;
}
.mail-name { font-size: 15.5px; font-weight: 700; color: var(--pink-deep); }
.mail-time { margin-left: auto; font-size: 12.5px; color: var(--ink-light); }
.mail-body { font-size: 15px; line-height: 1.9; color: var(--ink); white-space: pre-wrap; word-break: break-word; }
.mail-copy { margin-top: 12px; }

.load-more {
  display: block;
  margin: 22px auto 0;
  padding: 12px 40px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  color: var(--pink-deep);
  font-size: 14.5px;
  letter-spacing: 2px;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.load-more:disabled { opacity: .6; }

.empty-tip { text-align: center; color: var(--ink-light); font-size: 14px; padding: 50px 0; letter-spacing: 2px; }

/* 配置提示横幅 */
.config-warn {
  background: #fff7e6;
  border: 1px solid #ffd591;
  color: #8c6a1d;
  border-radius: 14px;
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.8;
  margin-bottom: 20px;
}

/* ============ 响应式 ============ */
@media (max-width: 480px) {
  .wrap { padding: 28px 16px 44px; }
  .site-title { font-size: 32px; }
  .letter-card { padding: 26px 18px 22px; }
  .field textarea { height: 256px; }
  .stat-num { font-size: 28px; }
  .mail-time { margin-left: 0; width: 100%; order: 3; }
  .topbar { flex-direction: column; gap: 14px; align-items: center; }
}