/* ===== 全局重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --red: #ff2442;
  --red-light: #ff6b81;
  --red-bg: #fff0f2;
  --gray-1: #f5f5f5;
  --gray-2: #e8e8e8;
  --gray-3: #c8c8c8;
  --gray-4: #999;
  --gray-5: #666;
  --gray-6: #333;
  --black: #1a1a1a;
  --white: #fff;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.18);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --header-h: 112px;
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f8f8f8;
  color: var(--black);
  min-height: 100vh;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

input, textarea, button {
  font-family: inherit;
  outline: none;
  border: none;
}

button { cursor: pointer; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-4); }

/* ===== 顶部导航 ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--white);
  box-shadow: 0 1px 0 var(--gray-2);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 24px;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-icon { font-size: 24px; }
.logo-text {
  font-size: 20px;
  font-weight: 800;
  color: var(--red);
  letter-spacing: -0.5px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
}
.nav-item {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-5);
  text-decoration: none;
  transition: all var(--transition);
}
.nav-item:hover { color: var(--red); background: var(--red-bg); }
.nav-item.active { color: var(--red); font-weight: 700; }

.header-center { flex: 1; }

.search-bar {
  display: flex;
  align-items: center;
  background: var(--gray-1);
  border-radius: 22px;
  padding: 0 16px;
  gap: 8px;
  height: 40px;
  border: 1.5px solid transparent;
  transition: all var(--transition);
}
.search-bar:focus-within {
  background: var(--white);
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(255,36,66,0.08);
}
.search-icon { font-size: 16px; color: var(--gray-4); flex-shrink: 0; }
.search-bar input {
  flex: 1;
  background: transparent;
  font-size: 14px;
  color: var(--black);
}
.search-bar input::placeholder { color: var(--gray-4); }
.search-btn {
  background: var(--red);
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 16px;
  flex-shrink: 0;
  transition: opacity var(--transition);
}
.search-btn:hover { opacity: 0.85; }

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.publish-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--red);
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 20px;
  transition: all var(--transition);
}
.publish-btn:hover { background: #e01e3a; transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.publish-btn span { font-size: 18px; font-weight: 300; line-height: 1; }

.user-avatar {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 20px;
  transition: background var(--transition);
}
.user-avatar:hover { background: var(--gray-1); }
.user-avatar img {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 2px solid var(--gray-2);
  object-fit: cover;
}
.user-name { font-size: 13px; color: var(--gray-6); font-weight: 500; }

/* ===== 标签栏 ===== */
.tags-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 24px;
  overflow-x: auto;
  border-top: 1px solid var(--gray-1);
  scrollbar-width: none;
}
.tags-bar::-webkit-scrollbar { display: none; }

.tag-btn {
  padding: 5px 16px;
  border-radius: 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-5);
  background: var(--gray-1);
  white-space: nowrap;
  transition: all var(--transition);
  flex-shrink: 0;
}
.tag-btn:hover { color: var(--red); background: var(--red-bg); }
.tag-btn.active {
  background: var(--red);
  color: var(--white);
}

/* ===== 主内容 ===== */
.main-content {
  padding-top: var(--header-h);
  min-height: 100vh;
}

.page { display: none; }
.page.active { display: block; }

/* ===== 按钮通用 ===== */
.btn-primary {
  background: var(--red);
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 24px;
  transition: all var(--transition);
}
.btn-primary:hover { background: #e01e3a; transform: translateY(-1px); box-shadow: var(--shadow-sm); }

.btn-ghost {
  background: transparent;
  color: var(--gray-5);
  font-size: 15px;
  font-weight: 500;
  padding: 12px 28px;
  border-radius: 24px;
  border: 1.5px solid var(--gray-2);
  transition: all var(--transition);
}
.btn-ghost:hover { border-color: var(--gray-3); color: var(--gray-6); }

.follow-btn {
  background: var(--red);
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 18px;
  border-radius: 18px;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.follow-btn:hover { background: #e01e3a; }
.follow-btn.following {
  background: var(--white);
  color: var(--gray-5);
  border: 1.5px solid var(--gray-2);
}
.follow-btn.following:hover { border-color: var(--red); color: var(--red); }

/* ===== 弹窗通用 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}
.modal-overlay.open { display: flex; }

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.detail-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  color: var(--gray-6);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.detail-close:hover { background: var(--gray-1); transform: rotate(90deg); }

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(0,0,0,0.75);
  color: var(--white);
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 14px;
  pointer-events: none;
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 999;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== 加载中 ===== */
.loading-more {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 32px;
  color: var(--gray-4);
  font-size: 14px;
}
.loading-spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--gray-2);
  border-top-color: var(--red);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 空状态 ===== */
.follow-empty, .empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
  gap: 16px;
  color: var(--gray-4);
  font-size: 15px;
}
.empty-icon { font-size: 60px; }