/* ===== 全局样式 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #5BA4B5;
  --primary-light: #8CC5D1;
  --primary-dark: #3D7A8A;
  --accent: #F0A868;
  --bg: #F7FAFB;
  --card-bg: #FFFFFF;
  --text: #2C3E50;
  --text-light: #6B8A95;
  --border: #E0EEF1;
  --success: #6BBF8A;
  --warning: #F0C868;
  --shadow: 0 2px 16px rgba(91, 164, 181, 0.10);
  --radius: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== 导航栏 ===== */
.navbar {
  background: white;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 1px 8px rgba(91, 164, 181, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-dark);
  text-decoration: none;
}

.navbar .logo svg {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  padding: 8px 18px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--primary);
  color: white;
}

/* ===== 主容器 ===== */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

/* ===== 页面标题区 ===== */
.page-header {
  text-align: center;
  margin-bottom: 40px;
}

.page-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.page-header p {
  font-size: 15px;
  color: var(--text-light);
}

/* ===== 卡片 ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 24px rgba(91, 164, 181, 0.15);
}

/* ===== 表单 ===== */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.form-group textarea {
  width: 100%;
  min-height: 140px;
  padding: 16px;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 15px;
  line-height: 1.6;
  resize: vertical;
  transition: border-color 0.2s;
  font-family: inherit;
  color: var(--text);
}

.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea::placeholder {
  color: #B0C8D0;
}

/* 分类选择 */
.category-select {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.category-tag {
  padding: 8px 16px;
  border: 2px solid var(--border);
  border-radius: 24px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  background: white;
  color: var(--text-light);
  user-select: none;
}

.category-tag:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.category-tag.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* 提交按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 32px;
  border: none;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 12px rgba(91, 164, 181, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(91, 164, 181, 0.4);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  background: #d0e0e5;
}

.btn-danger {
  background: #FEE2E2;
  color: #DC2626;
}

.btn-danger:hover {
  background: #FECACA;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* ===== 回音墙卡片 ===== */
.board-item {
  position: relative;
}

.board-item .question {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 16px;
  padding: 16px;
  background: #F0F8FA;
  border-radius: 12px;
  border-left: 4px solid var(--primary-light);
}

.board-item .reply {
  font-size: 14px;
  color: var(--text);
  padding: 16px;
  background: #FFF9F0;
  border-radius: 12px;
  border-left: 4px solid var(--accent);
}

.board-item .reply::before {
  content: '💌 心理委员回复';
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}

.board-item .meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-light);
}

.board-item .category-badge {
  background: var(--primary-light);
  color: white;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
}

/* ===== 管理页面 ===== */
.admin-login {
  max-width: 360px;
  margin: 80px auto;
  text-align: center;
}

.admin-login .card {
  padding: 40px 32px;
}

.admin-login input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 15px;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}

.admin-login input:focus {
  outline: none;
  border-color: var(--primary);
}

.stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  flex: 1;
  background: white;
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  border: 1px solid var(--border);
}

.stat-card .num {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

.stat-card .label {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

.admin-item {
  border-left: 4px solid var(--warning);
}

.admin-item.replied {
  border-left-color: var(--success);
}

.admin-item .q-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.admin-item .q-time {
  font-size: 12px;
  color: var(--text-light);
}

.admin-item .q-status {
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 12px;
}

.admin-item .q-status.pending {
  background: #FEF3C7;
  color: #D97706;
}

.admin-item .q-status.done {
  background: #D1FAE5;
  color: #059669;
}

.admin-item .q-content {
  font-size: 14px;
  margin-bottom: 12px;
  color: var(--text);
}

.admin-item .existing-reply {
  background: #F0FDF4;
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 13px;
}

.admin-item .reply-form {
  display: flex;
  gap: 8px;
}

.admin-item .reply-form textarea {
  flex: 1;
  min-height: 60px;
  padding: 10px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  font-family: inherit;
  resize: vertical;
}

.admin-item .reply-form textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.admin-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

/* ===== 成功提示 ===== */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--success);
  color: white;
  padding: 12px 28px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(107, 191, 138, 0.3);
  opacity: 0;
  transition: all 0.3s;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state svg {
  width: 80px;
  height: 80px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state p {
  font-size: 15px;
}

/* ===== 温馨提示 ===== */
.tip-box {
  background: linear-gradient(135deg, #F0F8FA, #FFF9F0);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
}

.tip-box .icon {
  font-size: 20px;
  flex-shrink: 0;
}

/* ===== 字数统计 ===== */
.char-count {
  text-align: right;
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

.char-count.warn {
  color: #DC2626;
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeInUp 0.4s ease-out;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .navbar {
    padding: 12px 16px;
  }
  .navbar .logo {
    font-size: 17px;
  }
  .nav-links a {
    padding: 6px 12px;
    font-size: 13px;
  }
  .container {
    padding: 24px 16px 60px;
  }
  .page-header h1 {
    font-size: 22px;
  }
  .stats-bar {
    flex-direction: column;
  }
}