/* ============================================================
   校园失物招领系统 · 前端样式
   设计方向（PRD 第 7 节）：简洁现代 · 白底 + 单一主色（蓝）· 卡片式列表
   移动端优先：所有样式按手机屏幕设计，桌面端居中显示
   ============================================================ */

/* ---------- 设计变量（改这里就能换主题色） ---------- */
:root {
  --primary: #2563eb;         /* 主色：蓝 */
  --primary-bg: #eff6ff;      /* 主色的浅色底 */
  --green: #16a34a;           /* 已找到 */
  --green-bg: #f0fdf4;
  --gray: #9ca3af;            /* 已结束 */
  --gray-bg: #f3f4f6;
  --text: #1f2937;            /* 正文 */
  --text-sub: #6b7280;        /* 次要文字 */
  --text-light: #9ca3af;      /* 更浅的说明文字 */
  --bg: #f5f6f8;              /* 页面背景 */
  --card: #ffffff;            /* 卡片背景 */
  --border: #e5e7eb;
  --danger: #dc2626;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, .06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  max-width: 640px;          /* 桌面端居中，不铺满整个屏幕 */
  margin: 0 auto;
  min-height: 100vh;
  padding-bottom: 80px;      /* 给底部导航留位置 */
}

a { color: var(--primary); text-decoration: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
img { max-width: 100%; display: block; }

/* ============================================================
   顶部栏
   ============================================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.topbar h1 { font-size: 17px; font-weight: 600; flex: 1; }
.topbar .back {
  font-size: 22px;
  color: var(--text);
  cursor: pointer;
  line-height: 1;
  padding: 0 4px;
  user-select: none;
}
.topbar .action { font-size: 14px; color: var(--primary); cursor: pointer; }

/* ============================================================
   搜索框
   ============================================================ */
.search-wrap { padding: 12px 16px 8px; background: var(--card); }
.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border-radius: 20px;
  padding: 9px 14px;
}
.search-box input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 14px;
}
.search-box .icon { color: var(--text-light); font-size: 15px; }

/* ============================================================
   筛选标签（横向滚动）
   ============================================================ */
.filter-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 8px 16px 12px;
  background: var(--card);
  scrollbar-width: none;
}
.filter-row::-webkit-scrollbar { display: none; }
.chip {
  flex-shrink: 0;
  padding: 5px 14px;
  border-radius: 16px;
  background: var(--bg);
  color: var(--text-sub);
  font-size: 13px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all .15s;
}
.chip.active {
  background: var(--primary-bg);
  color: var(--primary);
  border-color: var(--primary);
  font-weight: 500;
}

/* 第二行筛选（类型 + 状态） */
.filter-row.sub { padding-top: 0; border-bottom: 1px solid var(--border); }

/* ============================================================
   卡片列表
   ============================================================ */
.list { padding: 12px 16px; display: flex; flex-direction: column; gap: 10px; }

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  cursor: pointer;
  transition: transform .1s;
}
.card:active { transform: scale(.99); }
.card.dim { opacity: .55; }        /* 已找到 / 已结束 置灰 */

.card-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.card-title {
  font-size: 16px;
  font-weight: 600;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.card-meta {
  display: flex;
  gap: 12px;
  font-size: 13px;
  color: var(--text-sub);
  flex-wrap: wrap;
}
.card-desc {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-sub);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 类型标签：失物 / 招领 */
.tag {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 500;
  flex-shrink: 0;
}
.tag.lost  { background: #fef3c7; color: #b45309; }   /* 失物：橙 */
.tag.found { background: #dbeafe; color: #1d4ed8; }   /* 招领：蓝 */

/* 状态徽章 */
.badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  flex-shrink: 0;
}
.badge.searching { background: var(--primary-bg); color: var(--primary); }
.badge.resolved  { background: var(--green-bg);   color: var(--green); }
.badge.closed    { background: var(--gray-bg);    color: var(--gray); }

/* ============================================================
   悬浮发布按钮
   ============================================================ */
.fab {
  position: fixed;
  right: 20px;              /* 手机端：距屏幕右边 20px */
  bottom: 90px;             /* 抬到底部导航上方 */
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(37, 99, 235, .4);
  cursor: pointer;
  z-index: 90;
  user-select: none;
}
/* 宽屏时内容居中（最大 640px），按钮跟着贴到内容区右边缘 */
@media (min-width: 680px) {
  .fab { right: calc(50% - 300px); }   /* 320（半宽） - 20（内缩） */
}

/* ============================================================
   底部导航
   ============================================================ */
.navbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 640px;
  margin: 0 auto;
  background: var(--card);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 100;
}
.navbar a {
  flex: 1;
  padding: 8px 0 10px;
  text-align: center;
  color: var(--text-light);
  font-size: 11px;
}
.navbar a.active { color: var(--primary); }
.navbar svg { display: block; margin: 0 auto 2px; }

/* ============================================================
   详情页
   ============================================================ */
.detail { padding: 16px; }
.detail h2 { font-size: 20px; margin-bottom: 10px; }
.detail .badges { display: flex; gap: 8px; margin-bottom: 16px; }

.info-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 12px;
}
.info-row {
  display: flex;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.info-row:last-child { border-bottom: none; }
.info-row .k { width: 76px; color: var(--text-sub); flex-shrink: 0; }
.info-row .v { flex: 1; word-break: break-word; }

.detail-desc { white-space: pre-wrap; font-size: 14px; color: var(--text); }

/* ============================================================
   表单
   ============================================================ */
.form { padding: 16px; }
.field { margin-bottom: 18px; }
.field > label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
}
.field .hint { font-size: 12px; color: var(--text-light); font-weight: 400; }

.input, .textarea, .select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  outline: none;
  transition: border-color .15s;
}
.input:focus, .textarea:focus, .select:focus { border-color: var(--primary); }
.textarea { min-height: 88px; resize: vertical; line-height: 1.5; }
.select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239ca3af' d='M6 8L2 4h8z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; }

/* 类型选择：两个大按钮 */
.type-picker { display: flex; gap: 12px; }
.type-btn {
  flex: 1;
  padding: 18px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  text-align: center;
  cursor: pointer;
  transition: all .15s;
}
.type-btn .emoji { font-size: 26px; display: block; margin-bottom: 4px; }
.type-btn .name { font-size: 15px; font-weight: 500; }
.type-btn .desc { font-size: 12px; color: var(--text-light); }
.type-btn.active { border-color: var(--primary); background: var(--primary-bg); }
.type-btn.active .name { color: var(--primary); }

/* 分类网格 */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.cat-item {
  padding: 12px 4px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  text-align: center;
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
}
.cat-item .emoji { font-size: 20px; display: block; margin-bottom: 2px; }
.cat-item.active {
  border-color: var(--primary);
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 500;
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: block;
  width: 100%;
  padding: 13px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity .15s;
}
.btn:active { opacity: .85; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-outline { background: var(--card); color: var(--text); border: 1px solid var(--border); }
.btn-danger  { background: var(--card); color: var(--danger); border: 1px solid #fecaca; }
.btn-sm { padding: 8px 14px; font-size: 14px; width: auto; display: inline-block; }

.btn-group { display: flex; gap: 10px; }
.btn-group .btn { flex: 1; }

/* 底部固定操作区 */
.bottom-actions {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 640px;
  margin: 0 auto;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  gap: 10px;
  z-index: 100;
}
.bottom-actions .btn { flex: 1; }

/* ============================================================
   空状态 / 加载 / 提示
   ============================================================ */
.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}
.empty .emoji { font-size: 44px; display: block; margin-bottom: 12px; }
.empty .tip { font-size: 14px; }

.loading { text-align: center; padding: 30px; color: var(--text-light); font-size: 14px; }
.load-more { text-align: center; padding: 16px; color: var(--text-light); font-size: 13px; }

#toast {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(.9);
  background: rgba(0, 0, 0, .82);
  color: #fff;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 14px;
  max-width: 76%;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: all .2s;
  z-index: 9999;
}
#toast.show { opacity: 1; transform: translate(-50%, -50%) scale(1); }

/* ============================================================
   我的页面
   ============================================================ */
.profile {
  background: var(--card);
  padding: 20px 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 600;
  flex-shrink: 0;
}
.profile .name { font-size: 17px; font-weight: 600; }
.profile .sub { font-size: 13px; color: var(--text-sub); }

.section-title {
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-sub);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 卡片上的操作按钮行 */
.card-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.card-actions .btn-sm { flex: 1; text-align: center; }

/* ============================================================
   登录 / 注册页
   ============================================================ */
.auth-wrap { padding: 40px 24px; }
.auth-logo { text-align: center; margin-bottom: 32px; }
.auth-logo .emoji { font-size: 52px; }
.auth-logo h1 { font-size: 22px; margin-top: 8px; }
.auth-logo p { font-size: 13px; color: var(--text-sub); }
.auth-footer { text-align: center; margin-top: 20px; font-size: 14px; color: var(--text-sub); }

/* ============================================================
   弹层（查看联系方式用）
   ============================================================ */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 32px;
}
.modal {
  background: #fff;
  border-radius: 14px;
  padding: 24px 20px 20px;
  width: 100%;
  max-width: 320px;
  text-align: center;
}
.modal h3 { font-size: 16px; margin-bottom: 4px; }
.modal .modal-sub { font-size: 13px; color: var(--text-sub); margin-bottom: 14px; }
.modal .contact-value {
  font-size: 17px;
  font-weight: 600;
  color: var(--primary);
  padding: 14px 12px;
  background: var(--primary-bg);
  border-radius: 10px;
  word-break: break-all;
  margin-bottom: 18px;
}