/* ============================================================
   个人主页样式 — 深色主题（配色风格参考 brittanychiang.com）
   ============================================================ */

/* ---------- 变量 ---------- */
:root {
  --bg: #0a192f;
  --bg-card: #112240;
  --bg-card-hover: #1d2d50;
  --bg-code: #0d1b30;
  --text: #8892b0;
  --text-light: #a8b2d1;
  --text-bright: #ccd6f6;
  --text-white: #e6f1ff;
  --accent: #64ffda;
  --accent-dim: rgba(100, 255, 218, 0.1);
  --border: #233554;
  --navy-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
  --font-sans: "Inter", "SF Pro Text", -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas,
    "Courier New", monospace;
  --transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
}

/* ---------- Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  color: var(--text-bright);
  line-height: 1.2;
  margin: 0;
}

p {
  margin: 0 0 1rem;
}

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

::selection {
  background: var(--bg-card-hover);
  color: var(--text-white);
}

/* 滚动条（深色适配） */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 6px;
}

/* ---------- 布局 ---------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.content {
  padding: 3rem 0 4rem;
}

@media (min-width: 1024px) {
  .container {
    display: flex;
    gap: 4rem;
    padding: 0 5rem;
  }
  .sidebar {
    position: sticky;
    top: 0;
    max-height: 100vh;
    width: 44%;
    max-width: 480px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 6rem 0;
  }
  .content {
    flex: 1;
    min-width: 0;
    padding: 6rem 0;
  }
}

/* ---------- 侧边栏 ---------- */
.sidebar {
  padding: 4rem 0 1rem;
}

.site-name {
  font-size: clamp(2.2rem, 4.5vw, 3rem);
  letter-spacing: -0.02em;
}

.site-name a {
  color: var(--text-white);
}

.site-name a:hover {
  color: var(--accent);
}

.site-title {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-bright);
  margin-top: 0.75rem;
  font-weight: 600;
}

.site-tagline {
  margin-top: 1rem;
  max-width: 22rem;
  font-size: 0.98rem;
}

.anchor-nav {
  margin-top: 3rem;
  display: none;
}

@media (min-width: 1024px) {
  .anchor-nav {
    display: block;
  }
}

.anchor-nav a {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.55rem 0;
  width: max-content;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
}

.anchor-nav .nav-line {
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: var(--text);
  transition: var(--transition);
}

.anchor-nav a:hover,
.anchor-nav a.active {
  color: var(--text-bright);
}

.anchor-nav a:hover .nav-line,
.anchor-nav a.active .nav-line {
  width: 4rem;
  background: var(--accent);
}

.socials {
  display: flex;
  gap: 1.35rem;
  margin-top: 2.5rem;
}

.socials a {
  color: var(--text-white);
  display: inline-flex;
}

.socials a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- 板块通用 ---------- */
.section {
  margin-bottom: 6rem;
  scroll-margin-top: 4rem;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-size: 1.45rem;
  margin-bottom: 2rem;
  position: sticky;
  top: 0;
  padding: 1rem 0;
  background: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(8px);
  z-index: 5;
}

@media (min-width: 1024px) {
  .section-heading {
    position: static;
    background: none;
    backdrop-filter: none;
    padding: 0;
  }
}

.section-num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: 400;
}

.heading-line {
  flex: 1;
  max-width: 300px;
  height: 1px;
  background: var(--border);
  opacity: 0.7;
}

.section-body p {
  margin-bottom: 1.1rem;
}

/* ---------- 技能 ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.skill-card {
  background: var(--bg-card);
  border-radius: 8px;
  padding: 1.4rem 1.5rem;
  box-shadow: var(--navy-shadow);
  transition: var(--transition);
}

.skill-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.skill-card h3 {
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 0.9rem;
  font-family: var(--font-mono);
  font-weight: 600;
}

/* 标签组 */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-list li {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-light);
  background: var(--accent-dim);
  border: 1px solid rgba(100, 255, 218, 0.15);
  border-radius: 99px;
  padding: 0.18rem 0.75rem;
  white-space: nowrap;
}

/* ---------- 工作经历时间线 ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.timeline-item {
  display: block;
  padding: 1.1rem 1.2rem;
  border-radius: 8px;
  transition: var(--transition);
}

.timeline-item:hover {
  background: var(--bg-card);
  box-shadow: var(--navy-shadow);
}

.timeline-period {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.timeline-body h3 {
  font-size: 1.02rem;
  margin-bottom: 0.6rem;
}

.timeline-body .company {
  color: var(--accent);
}

.timeline-body p {
  font-size: 0.94rem;
  margin-bottom: 0.9rem;
}

/* ---------- 项目卡片 ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--navy-shadow);
  transition: var(--transition);
  border: 1px solid transparent;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(100, 255, 218, 0.25);
}

.project-cover {
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #112240 0%, #1d3a5f 45%, #0d2137 100%);
  overflow: hidden;
}

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

.cover-placeholder {
  color: rgba(100, 255, 218, 0.45);
  transition: var(--transition);
}

.project-card:hover .cover-placeholder {
  color: var(--accent);
  transform: scale(1.08);
}

.project-body {
  padding: 1.3rem 1.4rem 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.6rem;
}

.project-top h3 {
  font-size: 1.05rem;
  transition: var(--transition);
}

.project-card:hover .project-top h3 {
  color: var(--accent);
}

.project-links {
  display: flex;
  gap: 0.75rem;
}

.project-links a {
  color: var(--text-bright);
  display: inline-flex;
}

.project-links a:hover {
  color: var(--accent);
}

.project-body > p {
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 1rem;
}

/* ---------- 文章列表 ---------- */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-list > li > a {
  display: block;
  padding: 1.1rem 1.2rem;
  border-radius: 8px;
  color: var(--text);
}

.post-list > li > a:hover {
  background: var(--bg-card);
  box-shadow: var(--navy-shadow);
}

.post-list time {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--text);
  display: block;
  margin-bottom: 0.35rem;
}

.post-list h3 {
  font-size: 1.02rem;
  margin-bottom: 0.4rem;
  transition: var(--transition);
}

.post-list > li > a:hover h3 {
  color: var(--accent);
}

.post-list p {
  font-size: 0.9rem;
  margin: 0;
}

.empty-tip {
  padding: 1rem 1.2rem;
  font-size: 0.9rem;
}

.more-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  font-size: 0.92rem;
  color: var(--accent);
  font-weight: 500;
}

.more-link:hover {
  gap: 0.8rem;
}

/* ---------- 联系区 ---------- */
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.8rem;
}

.contact-email {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-bright);
  letter-spacing: 0.02em;
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.8rem 1.6rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--accent);
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--accent-dim);
  color: var(--accent);
}

.btn-primary:hover {
  background: rgba(100, 255, 218, 0.18);
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--text-bright);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- 页脚 ---------- */
.footer {
  margin-top: 5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.footer a:hover {
  color: var(--text-bright);
}

/* ---------- 内页（博客 / 404） ---------- */
.page-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 5rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 2.2rem;
}

.back-link:hover {
  color: var(--accent);
}

.page-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin-bottom: 2.4rem;
}

.page-title .section-num {
  font-size: 1.3rem;
}

/* 文章详情 */
.post-header h1 {
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text);
  margin-bottom: 2.5rem;
}

.post-tag {
  color: var(--accent);
}

.post-content {
  font-size: 1rem;
}

.post-content h2 {
  font-size: 1.4rem;
  margin: 2.6rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.post-content h3 {
  font-size: 1.15rem;
  margin: 2rem 0 0.8rem;
}

.post-content p {
  margin-bottom: 1.2rem;
}

.post-content li {
  margin-bottom: 0.45rem;
}

.post-content ul,
.post-content ol {
  padding-left: 1.4rem;
  margin-bottom: 1.2rem;
}

.post-content ul {
  list-style: disc;
}

.post-content ol {
  list-style: decimal;
}

.post-content strong {
  color: var(--text-bright);
}

.post-content a {
  border-bottom: 1px solid var(--accent);
}

.post-content blockquote {
  margin: 1.5rem 0;
  padding: 0.6rem 1.4rem;
  border-left: 3px solid var(--accent);
  background: var(--bg-card);
  border-radius: 0 6px 6px 0;
  color: var(--text-light);
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.post-content th,
.post-content td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.9rem;
  text-align: left;
}

.post-content th {
  background: var(--bg-card);
  color: var(--text-bright);
}

/* 行内代码 */
code {
  font-family: var(--font-mono);
  font-size: 0.86em;
}

.post-content p > code,
.post-content li > code {
  background: var(--bg-card);
  color: var(--accent);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  word-break: break-word;
}

/* 代码块 */
.highlight {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.6rem 0;
  box-shadow: var(--navy-shadow);
}

.highlight pre {
  margin: 0;
  padding: 1.2rem 1.4rem;
  font-size: 0.86rem;
  line-height: 1.7;
  font-family: var(--font-mono);
  color: #d6deeb;
  tab-size: 4;
}

/* Pygments 代码高亮配色（深色主题） */
.highlight .c,
.highlight .c1,
.highlight .cm { color: #546e7a; font-style: italic; }   /* 注释 */
.highlight .k,
.highlight .kn,
.highlight .kd,
.highlight .kc,
.highlight .kr { color: #c792ea; }                          /* 关键字 */
.highlight .s,
.highlight .s1,
.highlight .s2,
.highlight .sb,
.highlight .sc { color: #c3e88d; }                          /* 字符串 */
.highlight .m,
.highlight .mi,
.highlight .mf { color: #f78c6c; }                          /* 数字 */
.highlight .nf,
.highlight .fm { color: #82aaff; }                          /* 函数名 */
.highlight .nc,
.highlight .nn { color: #ffcb6b; }                          /* 类/命名空间 */
.highlight .o,
.highlight .ow { color: #89ddff; }                          /* 运算符 */
.highlight .nb,
.highlight .bp { color: #ffcb6b; }                          /* 内置 */
.highlight .n,
.highlight .p { color: #d6deeb; }                           /* 普通名称/标点 */
.highlight .nt { color: #f07178; }                          /* HTML 标签 */
.highlight .nd { color: #c792ea; }                          /* 装饰器 */

/* ---------- 404 ---------- */
.error-page {
  text-align: center;
  padding-top: 18vh;
}

.error-code {
  font-size: clamp(4rem, 12vw, 7rem);
  font-family: var(--font-mono);
  color: var(--accent);
  line-height: 1;
  margin-bottom: 1.2rem;
}

.error-msg {
  margin-bottom: 2.2rem;
  font-size: 1.05rem;
}

/* ---------- AI 聊天组件 ---------- */
.chat-widget {
  position: fixed;
  right: 1.6rem;
  bottom: 1.6rem;
  z-index: 100;
  font-size: 15px;
}

.chat-toggle {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: var(--bg-card);
  color: var(--accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(2, 12, 27, 0.6);
  transition: var(--transition);
}

.chat-toggle:hover {
  transform: translateY(-3px) scale(1.04);
  background: var(--bg-card-hover);
}

.chat-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--accent);
  color: #0a192f;
  font-size: 0.62rem;
  font-weight: 800;
  padding: 0.15rem 0.4rem;
  border-radius: 99px;
  font-family: var(--font-mono);
}

.chat-panel {
  position: absolute;
  right: 0;
  bottom: 72px;
  width: min(380px, calc(100vw - 3.2rem));
  height: min(520px, calc(100vh - 8rem));
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 24px 60px -12px rgba(2, 12, 27, 0.85);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* hidden 属性优先：display:flex 会覆盖浏览器默认的 [hidden]{display:none}，
   不写这条会导致点击 X 关闭后面板不消失 */
.chat-panel[hidden] {
  display: none;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 25, 47, 0.6);
}

.chat-header-info {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.chat-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-header-info strong {
  display: block;
  color: var(--text-bright);
  font-size: 0.92rem;
  line-height: 1.3;
}

.chat-subtitle {
  font-size: 0.72rem;
  color: var(--text);
}

.chat-close {
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 0.3rem;
  display: flex;
  transition: var(--transition);
}

.chat-close:hover {
  color: var(--text-bright);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.msg {
  max-width: 86%;
  padding: 0.6rem 0.85rem;
  border-radius: 10px;
  font-size: 0.86rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  animation: msg-in 0.25s ease;
}

@keyframes msg-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.msg.bot {
  align-self: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-light);
}

.msg.user {
  align-self: flex-end;
  background: var(--accent-dim);
  border: 1px solid rgba(100, 255, 218, 0.25);
  color: var(--text-bright);
}

.msg.typing::after {
  content: "▍";
  color: var(--accent);
  animation: blink 0.9s steps(1) infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.chat-input {
  display: flex;
  gap: 0.6rem;
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border);
}

.chat-input input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-bright);
  padding: 0.6rem 0.9rem;
  font-size: 0.86rem;
  font-family: var(--font-sans);
  outline: none;
  transition: var(--transition);
}

.chat-input input:focus {
  border-color: var(--accent);
}

.chat-input input::placeholder {
  color: var(--text);
}

.chat-input button {
  background: var(--accent-dim);
  border: 1px solid rgba(100, 255, 218, 0.3);
  color: var(--accent);
  border-radius: 8px;
  width: 42px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.chat-input button:hover {
  background: rgba(100, 255, 218, 0.2);
}

/* ---------- 滚动渐入动画 ---------- */
body.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

body.js .reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  body.js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 小屏适配 ---------- */
@media (max-width: 640px) {
  body {
    font-size: 16px;
  }
  .section {
    margin-bottom: 4.5rem;
  }
  .section-heading {
    font-size: 1.25rem;
  }
  .chat-widget {
    right: 1rem;
    bottom: 1rem;
  }
}