/* ===== Mlife动态 - 全局样式 ===== */
/* 矢量图标（使用 emoji + CSS 绘制） */
/* 响应式布局 + 动画效果 */

:root {
  --primary: #336699;
  --primary-light: #4a8bc9;
  --primary-dark: #1a4d80;
  --bg: #e8e8e8;
  --card: #ffffff;
  --text: #222;
  --text-secondary: #666;
  --border: #e0e0e0;
  --danger: #e8203a;
  --success: #28a745;
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== 矢量图标（纯 CSS） ===== */
.icon {
  display: inline-block;
  width: 24px;
  height: 24px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  vertical-align: middle;
}

/* 用 emoji 作为矢量图标 */
.icon-like::before { content: "❤️"; }
.icon-comment::before { content: "💬"; }
.icon-share::before { content: "🔗"; }
.icon-edit::before { content: "✏️"; }
.icon-delete::before { content: "🗑️"; }
.icon-search::before { content: "🔍"; }
.icon-user::before { content: "👤"; }
.icon-home::before { content: "🏠"; }
.icon-settings::before { content: "⚙️"; }
.icon-logout::before { content: "🚪"; }
.icon-back::before { content: "⬅️"; }
.icon-loading { animation: spin 1s linear infinite; }
.icon-loading::before { content: "⏳"; }

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ===== 按钮动画 ===== */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s, height 0.4s;
}

.btn:active::after {
  width: 200px;
  height: 200px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 12px rgba(51,102,153,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(51,102,153,0.4);
}

.btn-secondary {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: #f5f5f5;
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover {
  background: #c00;
}

/* ===== 输入框动画 ===== */
.input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  transition: var(--transition);
  background: #fafafa;
}

.input:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(51,102,153,0.1);
}

/* ===== 卡片动画 ===== */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

/* ===== Loading 提示 ===== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.loading-overlay.show {
  opacity: 1;
  visibility: visible;
}

.loading-spinner {
  background: #fff;
  padding: 30px 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
  from { transform: scale(0.8); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.loading-spinner .spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 15px;
}

.loading-spinner p {
  font-size: 16px;
  color: var(--text-secondary);
}

/* ===== Toast 提示 ===== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(0,0,0,0.8);
  color: #fff;
  padding: 12px 24px;
  border-radius: 24px;
  font-size: 15px;
  z-index: 10000;
  opacity: 0;
  transition: all 0.3s ease;
  white-space: nowrap;
}

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

/* ===== 头像 ===== */
.avatar {
  border-radius: 50%;
  object-fit: cover;
  background: linear-gradient(135deg, #ddd, #aaa);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: bold;
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 侧边栏优化 ===== */
.sidebar {
  width: 220px;
  flex-shrink: 0;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 15px;
}

.user-text {
  flex: 1;
  min-width: 0; /* 允许收缩 */
}

.user-text p {
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-text p:first-child {
  font-weight: 600;
  color: var(--text);
}

/* ===== 响应式布局 ===== */
/* 桌面端 */
@media (min-width: 1024px) {
  .container { max-width: 1200px; margin: 0 auto; }
}

/* 平板端 */
@media (max-width: 1023px) and (min-width: 768px) {
  .sidebar { width: 180px; }
  .main-content { margin-left: 200px; }
}

/* 手机端 */
@media (max-width: 767px) {
  body { flex-direction: column; padding: 10px; }
  .sidebar {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    padding: 10px;
    gap: 10px;
  }
  .sidebar .user-info { display: none; }
  .sidebar .side-btn { width: auto; white-space: nowrap; }
  .main-content { margin-left: 0; padding: 15px; }
  .post-item { padding: 15px; }
  .dynamic-text { font-size: 16px; }
}

/* ===== 动画关键帧 ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* 应用动画 */
.fade-in { animation: fadeIn 0.4s ease; }
.slide-in { animation: slideInRight 0.4s ease; }
.pulse { animation: pulse 2s infinite; }
.bounce { animation: bounce 1s; }

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: #ccc; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #aaa; }

/* =====  selection 美化 ===== */
::selection {
  background: rgba(51,102,153,0.2);
  color: var(--primary-dark);
}