/* ===== 全局变量 ===== */
:root {
  --color-bg: #ffffff;
  --color-bg-subtle: #f6f8fa;
  --color-bg-inset: #eff2f5;
  --color-border: #d0d7de;
  --color-border-muted: #d8dee4;
  --color-fg: #1f2328;
  --color-fg-muted: #656d76;
  --color-accent: #0969da;
  --color-accent-hover: #0860ca;
  --color-success: #1a7f37;
  --color-danger: #cf222e;
  --color-danger-bg: #ffebe9;
  --color-warn: #9a6700;
  --color-header-bg: #24292f;
  --color-header-fg: #ffffff;
  --radius: 6px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 0 rgba(31, 35, 40, 0.04);
  --shadow-md: 0 8px 24px rgba(140, 149, 159, 0.2);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
}

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

html {
  font-size: 14px;
}

body {
  font-family: var(--font);
  color: var(--color-fg);
  background: var(--color-bg);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

button {
  font-family: inherit;
  cursor: pointer;
}

img {
  max-width: 100%;
}

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

.topbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-header-fg);
  font-weight: 600;
  font-size: 16px;
}
.brand:hover {
  text-decoration: none;
  color: rgba(255, 255, 255, 0.85);
}
.brand-icon {
  color: var(--color-header-fg);
}

.topnav {
  display: flex;
  gap: 4px;
}

.nav-link {
  color: rgba(255, 255, 255, 0.85);
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 14px;
}
.nav-link:hover {
  background: rgba(255, 255, 255, 0.12);
  text-decoration: none;
  color: #fff;
}
.nav-link.active {
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
}

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius);
}
.user-chip:hover {
  background: rgba(255, 255, 255, 0.12);
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 13px;
  color: #fff;
  background: linear-gradient(135deg, #58a6ff, #0969da);
  flex-shrink: 0;
}
.avatar-lg {
  width: 40px;
  height: 40px;
  font-size: 16px;
}

/* ===== 容器 ===== */
.container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
  flex: 1;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 5px 16px;
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-subtle);
  color: var(--color-fg);
  transition: all 0.15s;
  white-space: nowrap;
}
.btn:hover {
  background: var(--color-bg-inset);
  border-color: var(--color-border-muted);
}
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-success);
  color: #fff;
  border-color: rgba(31, 35, 40, 0.15);
}
.btn-primary:hover {
  background: #2da44e;
}

.btn-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border-color: rgba(207, 34, 46, 0.3);
}
.btn-danger:hover {
  background: #ffd4d0;
}

.btn-sm {
  padding: 3px 12px;
  font-size: 12px;
}

.btn-block {
  width: 100%;
}

/* ===== 页面标题区 ===== */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.page-title {
  font-size: 20px;
  font-weight: 600;
}
.page-subtitle {
  color: var(--color-fg-muted);
  font-size: 14px;
}

/* ===== Issue 列表工具栏 ===== */
.list-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius) var(--radius) 0 0;
  flex-wrap: wrap;
}

.filter-group {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}
.filter-btn {
  padding: 5px 14px;
  font-size: 14px;
  border: none;
  background: #fff;
  color: var(--color-fg);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.filter-btn + .filter-btn {
  border-left: 1px solid var(--color-border);
}
.filter-btn:hover {
  background: var(--color-bg-subtle);
}
.filter-btn.active {
  background: var(--color-bg-inset);
  font-weight: 600;
}

.count-badge {
  background: rgba(128, 128, 128, 0.2);
  color: var(--color-fg-muted);
  border-radius: 20px;
  padding: 0 8px;
  font-size: 12px;
  font-weight: 500;
}

.search-box {
  flex: 1;
  min-width: 160px;
  padding: 5px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  background: #fff;
}
.search-box:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}

/* ===== Issue 列表 ===== */
.issue-list {
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  overflow: hidden;
  background: #fff;
}

.issue-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border-muted);
  transition: background 0.1s;
}
.issue-item:last-child {
  border-bottom: none;
}
.issue-item:hover {
  background: var(--color-bg-subtle);
}

.issue-icon {
  margin-top: 2px;
  flex-shrink: 0;
}
.issue-icon svg {
  display: block;
}

.issue-body {
  flex: 1;
  min-width: 0;
}

.issue-title-line {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.issue-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-fg);
}
.issue-title:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.issue-meta {
  color: var(--color-fg-muted);
  font-size: 12px;
  margin-top: 4px;
}

.label {
  display: inline-flex;
  align-items: center;
  padding: 0 8px;
  height: 20px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  color: #fff;
}

.issue-extras {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  color: var(--color-fg-muted);
  font-size: 12px;
  flex-shrink: 0;
}
.issue-extras .comment-count {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===== 状态标签 ===== */
.state-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
}
.state-open {
  background: var(--color-success);
}
.state-closed {
  background: var(--color-danger);
}

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--color-fg-muted);
}
.empty-state svg {
  margin-bottom: 16px;
  opacity: 0.5;
}
.empty-state h3 {
  font-size: 18px;
  color: var(--color-fg);
  margin-bottom: 8px;
}

/* ===== 表单 ===== */
.form-label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 12px;
}
.form-label input,
.form-label textarea {
  display: block;
  margin-top: 6px;
  width: 100%;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--color-fg);
  font-weight: normal;
}
.form-label input:focus,
.form-label textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}

/* ===== 编辑器布局 ===== */
.editor-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 768px) {
  .editor-layout {
    grid-template-columns: 1fr;
  }
}

.editor-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
}
.editor-card .card-header {
  padding: 8px 16px;
  background: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.editor-toolbar {
  display: flex;
  gap: 4px;
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  color: var(--color-fg);
  font-size: 12px;
  cursor: pointer;
}
.toolbar-btn:hover {
  background: var(--color-bg-subtle);
}
.toolbar-btn svg {
  display: block;
}
.editor-textarea {
  width: 100%;
  min-height: 240px;
  padding: 16px;
  border: none;
  resize: vertical;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
}
.editor-textarea:focus {
  outline: none;
}
.editor-preview {
  padding: 16px;
  min-height: 240px;
  overflow: auto;
}

.title-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 16px;
}
.title-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

/* ===== Issue 详情 ===== */
.detail-header {
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 16px;
  margin-bottom: 24px;
}
.detail-title {
  font-size: 24px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.detail-meta {
  color: var(--color-fg-muted);
  font-size: 14px;
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.timeline-item {
  display: flex;
  gap: 12px;
}
.timeline-avatar {
  flex-shrink: 0;
}

.comment-card {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
}
.comment-card.is-author {
  border-color: var(--color-accent);
}
.comment-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  flex-wrap: wrap;
}
.comment-author {
  font-weight: 600;
  color: var(--color-fg);
}
.author-tag {
  background: var(--color-accent);
  color: #fff;
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 20px;
  font-weight: 500;
}
.comment-time {
  color: var(--color-fg-muted);
  font-size: 12px;
  margin-left: auto;
}
.comment-actions {
  margin-left: 8px;
  display: flex;
  gap: 4px;
}
.comment-body {
  padding: 16px;
}

.event-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px 8px 52px;
  color: var(--color-fg-muted);
  font-size: 14px;
}
.event-item svg {
  flex-shrink: 0;
}

/* ===== 模态框 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 16px;
}
.modal-overlay[hidden] {
  display: none;
}
.modal {
  background: #fff;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 400px;
  padding: 24px;
  position: relative;
  box-shadow: var(--shadow-md);
  animation: modalIn 0.2s ease;
}
@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  border: none;
  background: none;
  font-size: 24px;
  color: var(--color-fg-muted);
  line-height: 1;
}
.modal-close:hover {
  color: var(--color-fg);
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  padding-right: 24px;
}

.auth-form {
  display: flex;
  flex-direction: column;
}

.auth-hint {
  margin-top: 12px;
  font-size: 13px;
  min-height: 18px;
}
.auth-hint.error {
  color: var(--color-danger);
}
.auth-hint.success {
  color: var(--color-success);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  background: #24292f;
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  box-shadow: var(--shadow-md);
  z-index: 300;
  animation: toastIn 0.2s ease;
}
@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
}
.toast.error {
  background: var(--color-danger);
}
.toast.success {
  background: var(--color-success);
}

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 24px;
  text-align: center;
  color: var(--color-fg-muted);
  font-size: 13px;
}

/* ===== Markdown 渲染 ===== */
.markdown-body {
  font-size: 14px;
  word-wrap: break-word;
}
.markdown-body code {
  font-family: var(--font-mono);
  background: var(--color-bg-inset);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 85%;
}
.markdown-body pre code {
  display: block;
  padding: 16px;
  overflow-x: auto;
  background: var(--color-bg-subtle);
  border-radius: var(--radius);
}
.markdown-body p {
  margin-bottom: 12px;
}
.markdown-body p:last-child {
  margin-bottom: 0;
}
.markdown-body img {
  max-width: 100%;
}
.markdown-body ul,
.markdown-body ol {
  margin-bottom: 12px;
  padding-left: 28px;
}
.markdown-body blockquote {
  border-left: 4px solid var(--color-border);
  padding-left: 16px;
  color: var(--color-fg-muted);
  margin-bottom: 12px;
}
.markdown-body a {
  color: var(--color-accent);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .topbar-inner {
    padding: 10px 16px;
    flex-wrap: wrap;
  }
  .container {
    padding: 16px;
  }
  .issue-extras {
    display: none;
  }
  .detail-title {
    font-size: 20px;
  }
}

/* ===== 登录提示页 ===== */
.login-prompt {
  text-align: center;
  padding: 80px 24px;
}
.login-prompt h2 {
  font-size: 22px;
  margin-bottom: 12px;
}
.login-prompt p {
  color: var(--color-fg-muted);
  margin-bottom: 24px;
}