@import url('variables.css');
@import url('reset.css');

/* ===== 布局容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== 顶部导航 ===== */
.site-header {
  background: var(--color-card-bg);
  box-shadow: var(--shadow-card);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.site-logo span {
  margin-right: 6px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: var(--transition-base);
}

.site-nav a:hover {
  color: var(--color-primary);
}

/* ===== Flash 消息 ===== */
.flash-message {
  padding: 12px 20px;
  border-radius: 8px;
  margin: 12px auto;
  max-width: 1200px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  animation: flashIn 0.3s ease;
}

.flash-message--success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.flash-message--error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.flash-close {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  opacity: 0.5;
}

@keyframes flashIn {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== 分类导航 ===== */
.category-nav {
  padding: 16px 0;
  overflow-x: auto;
  white-space: nowrap;
}

.category-nav .container {
  display: flex;
  gap: 10px;
  flex-wrap: nowrap;
}

.category-nav a {
  padding: 6px 16px;
  border-radius: var(--radius-btn);
  font-size: 14px;
  color: var(--color-text-secondary);
  background: var(--color-card-bg);
  transition: var(--transition-base);
  flex-shrink: 0;
  text-decoration: none;
}

.category-nav a.active,
.category-nav a:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ===== 排序栏 ===== */
.sort-bar {
  padding: 8px 0 16px;
}

.sort-bar .container {
  display: flex;
  gap: 20px;
  align-items: center;
}

.sort-bar a {
  font-size: 13px;
  color: var(--color-text-hint);
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition-base);
  text-decoration: none;
}

.sort-bar a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ===== 瀑布流 ===== */
.waterfall-grid {
  position: relative;
  width: 100%;
}

.note-card {
  position: absolute;
  background: var(--color-card-bg);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: var(--transition-base);
  overflow: hidden;
  cursor: pointer;
}

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

.note-cover {
  width: 100%;
  overflow: hidden;
}

.note-cover img {
  width: 100%;
  display: block;
}

.note-info {
  padding: 10px 12px;
}

.note-title {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
}

.note-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--color-text-secondary);
}

.note-author {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.note-likes {
  font-size: 12px;
  color: var(--color-text-hint);
}

/* ===== 加载状态 ===== */
.feed-loader {
  text-align: center;
  padding: 20px;
  color: var(--color-text-hint);
  font-size: 14px;
}

.feed-end {
  text-align: center;
  padding: 20px;
  color: var(--color-text-hint);
  font-size: 13px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: var(--radius-btn);
  font-size: 14px;
  text-align: center;
  transition: var(--transition-base);
  cursor: pointer;
}

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

.btn--primary:hover {
  background: var(--color-primary-light);
}

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

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--danger {
  background: #dc3545;
  color: #fff;
}

.btn--danger:hover {
  background: #c82333;
}

.btn--sm {
  padding: 4px 12px;
  font-size: 12px;
}

/* ===== 表单 ===== */
.form-field {
  margin-bottom: 16px;
}

.form-field label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text-primary);
}

.form-field input[type="text"],
.form-field input[type="password"],
.form-field input[type="email"],
.form-field input[type="search"],
.form-field textarea,
.form-field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 14px;
  transition: var(--transition-base);
  background: var(--color-card-bg);
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 36, 66, 0.1);
}

.form-hint {
  font-size: 12px;
  color: var(--color-text-hint);
  margin-top: 4px;
}

.optional {
  font-weight: 400;
  color: var(--color-text-hint);
  font-size: 12px;
}

/* ===== 消息提示 ===== */
.message {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
}

.message--error {
  background: #f8d7da;
  color: #721c24;
}

.message--success {
  background: #d4edda;
  color: #155724;
}

/* ===== 页脚 ===== */
.site-footer {
  text-align: center;
  padding: 24px;
  color: var(--color-text-hint);
  font-size: 12px;
  margin-top: 40px;
}

/* ===== 标签 ===== */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 500;
}

.badge--success {
  background: #d4edda;
  color: #155724;
}

.badge--warning {
  background: #fff3cd;
  color: #856404;
}

/* ===== Toast 提示 ===== */
.toast-message {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  color: #fff;
  background: #333;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0s 0.3s;
  pointer-events: none;
}

.toast-message.show {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease, visibility 0s 0s;
}

/* ===== 作业导航 ===== */
.assignments-page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 16px;
}

.assignments-page h1 {
  text-align: center;
  margin-bottom: 8px;
}

.page-intro {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.phase {
  margin-bottom: 32px;
}

.phase h2 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.assignment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.assignment-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-base);
}

.assignment-card:hover {
  box-shadow: var(--shadow-hover);
}

.hw-num {
  display: inline-block;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 8px;
}

.assignment-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.assignment-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.hw-targets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.target-link {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  background: var(--color-bg);
  color: var(--color-text-secondary);
  transition: var(--transition-base);
}

.target-link:hover {
  background: var(--color-primary-bg);
  color: var(--color-primary);
}

.target-link--primary {
  background: var(--color-primary);
  color: #fff;
}

.target-link--primary:hover {
  background: var(--color-primary-light);
}

.hw-hint {
  margin-top: 10px;
  padding: 8px 12px;
  background: #f0f7ff;
  border-radius: 6px;
  font-size: 12px;
  color: #0066cc;
}

.hw-hint code {
  background: rgba(0,102,204,0.1);
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 11px;
}

.ai-tips {
  margin-top: 16px;
  padding: 16px;
  background: #f8f9fa;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.ai-tips h4 {
  font-size: 14px;
  margin-bottom: 10px;
}

.ai-tips ul {
  padding-left: 0;
}

.ai-tips li {
  margin-bottom: 10px;
  font-size: 13px;
  line-height: 1.5;
}

.ai-tips em {
  background: #e8f4fd;
  padding: 1px 4px;
  border-radius: 3px;
  font-style: normal;
  font-size: 12px;
}

.ai-tips-note {
  margin-top: 12px;
  font-size: 12px;
  color: var(--color-text-hint);
}

/* ===== 错误页 ===== */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
}

.error-container {
  padding: 40px;
}

.error-code {
  font-size: 120px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-message {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.error-container .btn {
  margin: 0 8px;
}

/* ===== 搜索页 ===== */
.search-page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 16px;
}

.search-form {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.search-input {
  flex: 1;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-btn);
  font-size: 14px;
}

.search-stats {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.search-tabs {
  display: flex;
  gap: 16px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 16px;
}

.search-tab {
  padding: 8px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  background: none;
}

.search-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-count {
  font-size: 12px;
  color: var(--color-text-hint);
}

/* ===== 用户卡片 ===== */
.user-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--color-card-bg);
  border-radius: var(--radius-card);
  margin-bottom: 8px;
}

.user-item__avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-avatar);
  object-fit: cover;
}

.user-item__info {
  flex: 1;
}

.user-item__name {
  font-size: 15px;
  font-weight: 500;
}

.user-item__bio {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 2px 0;
}

.user-item__stats {
  font-size: 12px;
  color: var(--color-text-hint);
}

.follow-btn {
  padding: 4px 16px;
  border-radius: var(--radius-btn);
  font-size: 13px;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
  cursor: pointer;
  transition: var(--transition-base);
}

.follow-btn.following {
  background: var(--color-bg);
  border-color: var(--color-border);
  color: var(--color-text-hint);
}

.note-owner-actions {
  display: flex;
  gap: 8px;
}

/* ===== 话题页 ===== */
.topic-page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 16px;
}

.topic-tag-display {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 8px;
}

.topic-hash {
  font-size: 28px;
  color: var(--color-primary);
  font-weight: 700;
}

.topic-name {
  font-size: 24px;
}

.topic-stats {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-bottom: 12px;
}

.topic-sort-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.sort-btn {
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--color-text-secondary);
  transition: var(--transition-base);
}

.sort-btn.active {
  background: var(--color-primary);
  color: #fff;
}

/* ===== 通用辅助 ===== */
.btn--block { display: block; width: 100%; }
.text-muted { color: var(--color-text-secondary); }
.d-inline { display: inline; }

/* ===== 页面标题 ===== */
.page-title { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.page-desc { color: var(--color-text-secondary); font-size: 14px; margin-bottom: 24px; }

/* ===== 性别图标 ===== */
.gender-icon {
    font-size: 16px;
    font-weight: normal;
    margin-left: 4px;
}
.gender-male {
    color: #3B82F6;
}
.gender-female {
    color: #EC4899;
}

/* ===== 首页精选区域 ===== */
.featured-section { margin: 24px 0; }
.section-title { font-size: 18px; font-weight: 600; margin-bottom: 16px; }
.featured-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.featured-card {
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: var(--transition-base);
  text-decoration: none;
  color: inherit;
  display: block;
}
.featured-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.featured-card img { width: 100%; height: 180px; object-fit: cover; display: block; }
.featured-info { padding: 12px; }
.featured-info h3 { font-size: 14px; font-weight: 500; margin-bottom: 4px; }
.featured-author { font-size: 12px; color: var(--color-text-secondary); }

/* ===== 侧边栏 ===== */
.sidebar-panel { position: fixed; right: 16px; top: 80px; width: 240px; z-index: 50; max-height: calc(100vh - 100px); overflow-y: auto; }
.hitokoto-box, .rank-box {
  background: var(--color-card-bg);
  border-radius: var(--radius-card);
  padding: 16px;
  box-shadow: var(--shadow-card);
  margin-bottom: 16px;
}
.hitokoto-text { font-size: 14px; line-height: 1.6; margin-bottom: 8px; color: var(--color-text-primary); }
.hitokoto-author { font-size: 12px; color: var(--color-text-hint); text-align: right; }
.rank-box h3 { font-size: 15px; margin-bottom: 12px; }
.rank-list { list-style: none; padding: 0; margin: 0; }
.rank-list li { margin-bottom: 8px; }
.rank-list a { font-size: 13px; color: var(--color-text-primary); text-decoration: none; display: flex; justify-content: space-between; align-items: center; }
.rank-num { color: var(--color-primary); font-weight: 600; margin-right: 6px; }
.rank-likes { color: var(--color-text-hint); font-size: 12px; }

/* ===== 搜索辅助 ===== */
.no-results { text-align: center; padding: 40px; color: var(--color-text-hint); }
.user-list { display: flex; flex-direction: column; gap: 8px; }
.user-list .user-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--color-card-bg);
  border-radius: var(--radius-card);
  text-decoration: none;
  color: inherit;
}
.user-avatar { width: 48px; height: 48px; border-radius: var(--radius-avatar); object-fit: cover; }
.user-info { flex: 1; }
.user-name { font-size: 15px; font-weight: 500; display: block; }
.user-bio { font-size: 13px; color: var(--color-text-secondary); display: block; }
.user-followers { font-size: 12px; color: var(--color-text-hint); }

/* ===== 笔记详情页 ===== */
.note-detail-page { max-width: 1100px; margin: 24px auto; }
.comments-list { margin-top: 24px; }

/* ===== 回复 ===== */
.reply-btn { background: none; border: none; color: var(--color-text-hint); font-size: 12px; cursor: pointer; padding: 0; }
.reply-btn:hover { color: var(--color-primary); }
.reply-form { margin-top: 8px; }
.reply-text {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 13px;
  resize: vertical;
}

/* ===== 图片上传区域 ===== */
.image-upload-area {
  border: 2px dashed var(--color-border);
  border-radius: 12px;
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-base);
}
.image-upload-area:hover,
.image-upload-area.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}
.upload-placeholder { color: var(--color-text-hint); font-size: 14px; }
.image-preview-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.image-preview-item { position: relative; width: 80px; height: 80px; border-radius: 8px; overflow: hidden; }
.image-preview-item img { width: 100%; height: 100%; object-fit: cover; }
.remove-btn {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0,0,0,0.6);
  color: #fff;
  border: none;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== 标签云 ===== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-count { font-size: 12px; color: var(--color-text-hint); margin-left: 4px; }

/* ===== Flash 消息变体 ===== */
.flash-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.flash-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }

/* ===== 通用表单样式 ===== */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text-primary);
}
.form-group label .required {
  color: var(--color-primary);
  margin-left: 2px;
}
.form-group .form-hint {
  font-size: 12px;
  color: var(--color-text-hint);
  margin-top: 4px;
}
.form-control {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border, #ddd);
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: var(--color-card-bg, #fff);
  box-sizing: border-box;
}
.form-control:focus {
  outline: none;
  border-color: var(--color-primary, #FF2442);
  box-shadow: 0 0 0 3px rgba(255,36,66,0.08);
}
.form-control::placeholder {
  color: var(--color-text-hint, #bbb);
}
textarea.form-control {
  resize: vertical;
  line-height: 1.6;
}
select.form-control {
  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='%23999' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  cursor: pointer;
}

/* ===== 发布页面 ===== */
.publish-page { max-width: 700px; margin: 24px auto; }
.publish-page h1 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}
.publish-form .form-group label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
}
.publish-form .btn--primary {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  margin-top: 8px;
}