/** ============================================================
 *  郑州新华学生社区 — 共享样式表
 *  所有页面统一引用，减少重复代码
 * ============================================================
 *  版本: v2 - 统一设计系统 (2026-06-05)
 *  引用方式: <link rel="stylesheet" href="assets/css/common.css">
 * ============================================================
 *  设计系统
 *  ------- 
 *  底色:    #010510 (深空黑)
 *  卡片:    rgba(255,255,255,.04) 
 *  主色:    #7c3aed → #a78bfa (紫色系)
 *  强调:    #ff2d95 / #00d4ff (粉色/青)
 *  文字:    #e2e8f0 / rgba(196,180,252,.5)
 *  圆角:    12px / 16px / 20px
 *  字体:    -apple-system, 'PingFang SC', 'Microsoft YaHei'
 * ============================================================ */

/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  background:#070614;color:#f1f5f9;min-height:100vh;
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
}
a{color:#c084fc;text-decoration:none}
img{max-width:100%;display:block}

/* ===== 导航栏 ===== */
.navbar{
  position:sticky;top:0;z-index:100;
  height:52px;display:flex;align-items:center;gap:10px;
  padding:0 14px;
  background:rgba(5,2,20,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(168,85,247,.12);
}
.nav-back{
  width:34px;height:34px;border-radius:10px;
  background:rgba(124,58,237,.12);border:1px solid rgba(168,85,247,.18);
  display:flex;align-items:center;justify-content:center;
  color:#c084fc;cursor:pointer;font-size:.9rem;flex-shrink:0;
}
.nav-title{
  font-size:.95rem;font-weight:700;
  background:linear-gradient(135deg,#a78bfa,#c084fc);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  flex:1;
}

/* ===== 侧边菜单 ===== */
.side-overlay{
  position:fixed;inset:0;z-index:200;
  background:rgba(0,0,0,.5);backdrop-filter:blur(4px);
  opacity:0;pointer-events:none;transition:opacity .3s;
}
.side-overlay.show{opacity:1;pointer-events:all}
.side-menu{
  position:fixed;top:0;left:-280px;bottom:0;z-index:201;
  width:260px;
  background:rgba(8,4,25,.98);border-right:1px solid rgba(168,85,247,.12);
  transition:left .3s cubic-bezier(.16,1,.3,1);
  overflow-y:auto;
}
.side-menu.show{left:0}
.side-header{padding:20px 16px 12px;border-bottom:1px solid rgba(168,85,247,.08)}
.side-title{font-size:1.05rem;font-weight:800;background:linear-gradient(135deg,#a78bfa,#e879f9);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.side-sub{font-size:.75rem;color:#cbd5e1;margin-top:2px}
.side-body{padding:8px 0}
.side-item{
  display:flex;align-items:center;gap:10px;
  padding:11px 16px;color:#cbd5e1;font-size:.85rem;
  cursor:pointer;transition:all .15s;
}
.side-item:hover{background:rgba(124,58,237,.08);color:#f1f5f9}
.side-item i{width:20px;text-align:center;color:#c084fc;font-size:.9rem}
.side-divider{height:1px;background:rgba(168,85,247,.06);margin:6px 12px}
.side-footer{padding:12px 16px;font-size:.72rem;color:#9ca3af;text-align:center}

/* ===== 主内容区 ===== */
.main-wrap{max-width:680px;margin:0 auto;padding:16px 12px 80px}
.page-tag{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(124,58,237,.12);border:1px solid rgba(168,85,247,.2);
  border-radius:20px;padding:4px 12px;
  font-size:.78rem;color:#c084fc;margin-bottom:14px;
}

/* ===== 卡片通用 ===== */
.card{
  background:rgba(255,255,255,.10);
  border:1px solid rgba(168,85,247,.20);
  border-radius:14px;padding:16px;margin-bottom:10px;
  transition:all .2s;
}
.card:hover{background:rgba(255,255,255,.10);border-color:rgba(168,85,247,.18)}
.card-row{display:flex;align-items:center;gap:8px}
.card-title{font-size:.92rem;font-weight:700;color:#f1f5f9;flex:1}
.card-meta{font-size:.7rem;color:#cbd5e1}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:10px 24px;border:none;border-radius:12px;
  font-size:.85rem;font-weight:600;cursor:pointer;
  transition:opacity .2s,transform .15s;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:linear-gradient(135deg,#7c3aed,#9d4edd);color:#fff}
.btn-primary:hover{opacity:.9}
.btn-ghost{background:rgba(124,58,237,.12);border:1px solid rgba(168,85,247,.18);color:#c084fc}
.btn-ghost:hover{background:rgba(124,58,237,.2)}
.btn-block{width:100%}
.btn-sm{padding:6px 14px;font-size:.78rem;border-radius:10px}

/* ===== 表单项 ===== */
.input{
  width:100%;padding:11px 14px;
  background:rgba(255,255,255,.10);
  border:1px solid rgba(168,85,247,.18);
  border-radius:10px;color:#f1f5f9;font-size:.9rem;
  outline:none;transition:border-color .2s;
}
.input:focus{border-color:#c084fc;box-shadow:0 0 0 3px rgba(167,139,250,.1)}
.input::placeholder{color:#6b7280}
.textarea{
  width:100%;padding:11px 14px;resize:vertical;min-height:100px;
  background:rgba(255,255,255,.10);
  border:1px solid rgba(168,85,247,.18);
  border-radius:10px;color:#f1f5f9;font-size:.9rem;
  outline:none;transition:border-color .2s;font-family:inherit;
}
.textarea:focus{border-color:#c084fc}
.form-label{font-size:.78rem;color:#c084fc;margin-bottom:6px;display:block}

/* ===== Toast 提示 ===== */
.toast{
  position:fixed;bottom:80px;left:50%;transform:translateX(-50%);z-index:999;
  padding:10px 20px;border-radius:12px;
  background:rgba(8,4,25,.95);border:1px solid rgba(168,85,247,.2);
  color:#f1f5f9;font-size:.82rem;
  box-shadow:0 8px 32px rgba(0,0,0,.4);
  opacity:0;transition:opacity .3s;pointer-events:none;
}
.toast.show{opacity:1}

/* ===== 空状态 ===== */
.empty-state{
  text-align:center;padding:60px 20px;color:rgba(196,180,252,.15);
}
.empty-state i{display:block;font-size:2.5rem;margin-bottom:10px}

/* ===== 加载动画 ===== */
.loading-spinner{
  width:28px;height:28px;border:2px solid rgba(168,85,247,.12);
  border-top-color:#c084fc;border-radius:50%;
  animation:spin .6s linear infinite;margin:20px auto;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== 音乐播放器 ===== */
.lt-player-wrap{position:fixed;bottom:0;left:0;right:0;z-index:300}

/* ===== 帖子卡片 ===== */
.post-card{
  background:rgba(255,255,255,.10);
  border:1px solid rgba(168,85,247,.20);
  border-radius:14px;padding:14px 16px;margin-bottom:10px;
  cursor:pointer;transition:all .2s;
  animation:postIn .3s ease-out backwards;
}
@keyframes postIn{
  from{opacity:0;transform:translateY(12px)}
  to{opacity:1;transform:translateY(0)}
}
.post-card:hover{background:rgba(255,255,255,.10);border-color:rgba(168,85,247,.16)}
.post-author{font-size:.78rem;color:#cbd5e1;margin-bottom:4px}
.post-text{font-size:.88rem;color:#f1f5f9;line-height:1.6;margin-bottom:8px}
.post-text.collapsed{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.post-media{margin-bottom:8px;border-radius:10px;overflow:hidden}
.post-media img,.post-media video{width:100%;display:block;max-height:360px;object-fit:cover}
.post-actions{display:flex;gap:16px;font-size:.75rem;color:#cbd5e1}
.post-actions span{cursor:pointer;transition:color .2s;color:#cbd5e1!important}
.post-actions span:hover{color:#c084fc!important}
.post-actions .liked{color:#e879f9!important}
.post-time{font-size:.7rem;color:#9ca3af;margin-left:auto}

/* ===== 移动端适配 ===== */
@media(max-width:480px){
  .main-wrap{padding:12px 10px 80px}
  .post-card{padding:12px 14px;border-radius:12px}
  .side-menu{width:240px}
  /* 移动端高对比度文字 */
  .post-text{color:#f1f5f9!important;font-size:.92rem!important}
  .post-author{color:#cbd5e1!important}
  .post-time{color:#9ca3af!important}
  .post-actions{color:#f1f5f9!important}
  .post-actions span{color:#c084fc!important}
  .card-meta{color:#cbd5e1!important}
  .resource-module-title{color:#f1f5f9!important}
  .resource-module-desc{color:#9ca3af!important}
}
@media(min-width:768px){
  .post-card{padding:18px 20px}
}

/* ===== 打印 ===== */
@media print{body{background:#fff;color:#000}.navbar,.lt-player-wrap,.side-overlay{display:none}}