/* ============================================================
   DX Agent · 个人主页样式
   设计方向:编辑感 × 技术感。克制配色、强调排版、细微动效。
   ============================================================ */

:root {
  --paper: #faf9f6;
  --paper-raise: #ffffff;
  --ink: #191716;
  --ink-soft: #57534d;
  --ink-faint: #716b63;
  --line: #e7e3da;
  --line-strong: #d8d3c7;
  --accent: #b3331f;
  --accent-deep: #8e2716;
  --accent-tint: #f7ece7;
  --shadow-card: 0 1px 2px rgb(25 23 22 / 0.04), 0 8px 24px rgb(25 23 22 / 0.06);
  --shadow-card-hover: 0 2px 4px rgb(25 23 22 / 0.05), 0 16px 40px rgb(25 23 22 / 0.1);
  --radius-card: 16px;
  --radius-inner: 10px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC",
    "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas,
    "Courier New", monospace;
  --ease-out: cubic-bezier(0.2, 0, 0.2, 1);
}

/* ---------- 基础 ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background-color: var(--accent);
  color: #fff;
}

h1,
h2,
h3,
p,
ul {
  margin: 0;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

img,
svg {
  display: block;
}

.container {
  width: min(1120px, 100% - clamp(40px, 8vw, 96px));
  margin-inline: auto;
}

/* 键盘焦点:始终清晰可见 */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 跳转链接目标:可被程序聚焦,但不显示整页范围的焦点框 */
#main:focus {
  outline: none;
}

/* 跳转链接:默认隐藏,聚焦时浮现 */
.skip-link {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 18px;
  background-color: var(--ink);
  color: var(--paper);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-inner);
  transform: translateY(-200%);
  transition: transform 160ms var(--ease-out);
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline-color: var(--paper);
}

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease-out);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: 8px;
  transition: background-color 160ms var(--ease-out);
}

.brand:hover .brand-mark {
  background-color: var(--accent);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding-inline: 14px;
  color: var(--ink-soft);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-inner);
  transition: color 160ms var(--ease-out), background-color 160ms var(--ease-out);
}

.nav-link:hover {
  color: var(--ink);
  background-color: rgb(25 23 22 / 0.05);
}

.nav-link[aria-current="true"] {
  color: var(--accent);
}

.nav-link-external {
  border: 1px solid var(--line-strong);
  margin-left: 8px;
  background-color: var(--paper-raise);
}

.nav-link-external:hover {
  border-color: var(--ink);
}

/* 移动端菜单按钮:桌面端隐藏 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-width: 44px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-inner);
  background-color: var(--paper-raise);
  color: var(--ink);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
}

.nav-toggle-bars {
  position: relative;
  width: 16px;
  height: 12px;
}

.nav-toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform 200ms var(--ease-out), top 200ms var(--ease-out);
}

.nav-toggle-bars span:first-child {
  top: 0;
}

.nav-toggle-bars span:last-child {
  top: 10px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child {
  top: 5px;
  transform: rotate(-45deg);
}

/* ---------- 首屏 ---------- */

.hero {
  position: relative;
  padding-block: clamp(88px, 15vw, 176px) clamp(64px, 10vw, 120px);
  overflow: hidden;
}

/* 极浅的编辑网格背景,纯 CSS 渐变,无外部资源 */
.hero::before,
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgb(25 23 22 / 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(25 23 22 / 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 0%, black 30%, transparent 75%);
  pointer-events: none;
}

.hero > .container,
.page-hero > .container {
  position: relative;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
}

.hero-title {
  margin-top: 20px;
  font-size: clamp(3rem, 9vw, 5.75rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.hero-dot {
  color: var(--accent);
}

.hero-lede {
  margin-top: 24px;
  max-width: 620px;
  font-size: clamp(1.0625rem, 1.4vw, 1.1875rem);
  line-height: 1.9;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.hero-lede strong {
  color: var(--ink);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: 48px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.hero-meta li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-meta li::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 50%;
}

/* 首屏入场:一次性编排,分段错开 ~90ms */
@media (prefers-reduced-motion: no-preference) {
  .hero-item {
    animation: hero-in 640ms var(--ease-out) both;
  }

  .hero-item:nth-child(1) { animation-delay: 0ms; }
  .hero-item:nth-child(2) { animation-delay: 90ms; }
  .hero-item:nth-child(3) { animation-delay: 180ms; }
  .hero-item:nth-child(4) { animation-delay: 270ms; }
  .hero-item:nth-child(5) { animation-delay: 360ms; }
}

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 22px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-inner);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 120ms var(--ease-out),
    background-color 160ms var(--ease-out),
    border-color 160ms var(--ease-out),
    color 160ms var(--ease-out),
    box-shadow 160ms var(--ease-out);
}

.btn:active {
  transform: scale(0.96);
}

.btn .icon {
  transition: transform 160ms var(--ease-out);
}

.btn:hover .icon {
  transform: translate(2px, -2px);
}

.btn-primary {
  background-color: var(--ink);
  color: var(--paper);
  box-shadow: 0 1px 2px rgb(25 23 22 / 0.15);
}

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

.btn-ghost {
  background-color: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* ---------- 区块通用 ---------- */

.section {
  padding-block: clamp(64px, 9vw, 112px);
  scroll-margin-top: 72px;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-head {
  max-width: 640px;
  margin-bottom: clamp(36px, 5vw, 56px);
}

.section-title {
  margin-top: 14px;
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  font-weight: 750;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.section-desc {
  margin-top: 14px;
  color: var(--ink-soft);
  line-height: 1.85;
  text-wrap: pretty;
}

/* ---------- 项目卡片 ---------- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: clamp(24px, 3vw, 36px);
  background-color: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition:
    transform 200ms var(--ease-out),
    box-shadow 200ms var(--ease-out),
    border-color 200ms var(--ease-out);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-card-hover);
}

.project-top {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.project-index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.project-title {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  overflow-wrap: break-word;
}

.project-desc {
  margin-top: 14px;
  color: var(--ink-soft);
  line-height: 1.85;
  text-wrap: pretty;
  flex-grow: 1;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.tag {
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-soft);
  background-color: rgb(25 23 22 / 0.05);
  border-radius: 999px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  min-height: 44px;
  margin-top: 20px;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out);
}

.project-link:hover {
  color: var(--accent-deep);
  border-bottom-color: var(--accent-deep);
}

.project-link .icon {
  transition: transform 160ms var(--ease-out);
}

.project-link:hover .icon {
  transform: translate(2px, -2px);
}

/* ---------- 开源增强卡片 ---------- */

.oss-card {
  padding: clamp(24px, 3.5vw, 40px);
  background-color: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.oss-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 7px 14px;
  background-color: var(--paper-raise);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 999px;
  color: var(--accent-deep);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.4;
}

.oss-badge .icon {
  flex-shrink: 0;
}

.oss-card .project-desc {
  max-width: 720px;
}

.oss-credit {
  margin-top: 16px;
  max-width: 720px;
  padding-left: 16px;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-size: 0.9375rem;
  line-height: 1.85;
  text-wrap: pretty;
}

.oss-credit a {
  color: var(--accent-deep);
  font-weight: 600;
}

.oss-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.oss-actions .btn-ghost {
  background-color: var(--paper-raise);
}

/* ---------- 关于 ---------- */

.section-about {
  background-color: var(--paper-raise);
  border-top: 1px solid var(--line);
}

.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: clamp(24px, 5vw, 72px);
  align-items: start;
}

.about-grid .section-head {
  margin-bottom: 0;
}

.about-body p + p {
  margin-top: 16px;
}

.about-body p {
  color: var(--ink-soft);
  line-height: 1.9;
  text-wrap: pretty;
}

.about-body a {
  color: var(--accent);
  font-weight: 600;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 40px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 32px;
}

.footer-line {
  font-weight: 600;
  font-size: 0.9375rem;
}

.footer-line a {
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.footer-note {
  flex-basis: 100%;
  max-width: 640px;
  color: var(--ink-faint);
  font-size: 0.8125rem;
  line-height: 1.8;
}

.footer-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  margin-left: auto;
  color: var(--ink-soft);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 160ms var(--ease-out);
}

.footer-top:hover {
  color: var(--accent);
}

.footer-top .icon {
  transition: transform 160ms var(--ease-out);
}

.footer-top:hover .icon {
  transform: translateY(-2px);
}

/* ---------- 跨站共享:屏幕阅读器专用文本 ---------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 跨站共享:页脚站点导航 ---------- */

.footer-sites {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px 6px;
  flex-basis: 100%;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.footer-sites a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding-inline: 8px;
  color: var(--ink-soft);
  text-decoration: none;
  border-radius: 6px;
  transition: color 160ms var(--ease-out), background-color 160ms var(--ease-out);
}

.footer-sites a:hover {
  color: var(--accent);
  background-color: rgb(25 23 22 / 0.05);
}

.footer-sites a[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

/* ---------- 跨站共享:页面首屏 ---------- */

.page-hero {
  position: relative;
  padding-block: clamp(56px, 9vw, 104px) clamp(40px, 6vw, 64px);
  overflow: hidden;
}

.page-hero .crumbs {
  margin-bottom: clamp(28px, 4vw, 40px);
}

.page-title {
  margin-top: 16px;
  font-size: clamp(2.25rem, 6vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-title .hero-dot {
  color: var(--accent);
}

/* ---------- 跨站共享:面包屑 ---------- */

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.875rem;
  color: var(--ink-faint);
}

.crumbs li {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.crumbs li + li::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--line-strong);
}

.crumbs a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--ink-soft);
  text-decoration: none;
  border-radius: 6px;
  transition: color 160ms var(--ease-out);
}

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

.crumbs [aria-current="page"] {
  color: var(--ink);
  font-weight: 500;
  overflow-wrap: anywhere;
}

/* ---------- 跨站共享:长文排版(博客文章与项目详情) ---------- */

.prose {
  max-width: 720px;
  color: var(--ink-soft);
}

.prose > :first-child {
  margin-top: 0;
}

.prose h2 {
  margin-top: clamp(36px, 5vw, 48px);
  margin-bottom: 0;
  color: var(--ink);
  font-size: clamp(1.375rem, 2.6vw, 1.75rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-wrap: balance;
  scroll-margin-top: 84px;
}

.prose h3 {
  margin-top: 28px;
  margin-bottom: 0;
  color: var(--ink);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
}

.prose p,
.prose ul,
.prose ol,
.prose pre,
.prose blockquote {
  margin-top: 16px;
  margin-bottom: 0;
}

.prose p,
.prose li {
  line-height: 1.9;
  text-wrap: pretty;
}

.prose ul,
.prose ol {
  padding-left: 1.5em;
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li + li {
  margin-top: 6px;
}

.prose li::marker {
  color: var(--accent);
}

.prose a {
  color: var(--accent);
  font-weight: 600;
}

.prose a:hover {
  color: var(--accent-deep);
}

.prose strong {
  color: var(--ink);
  font-weight: 600;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 2px 6px;
  background-color: rgb(25 23 22 / 0.06);
  border-radius: 6px;
  overflow-wrap: break-word;
}

.prose pre {
  padding: 18px 20px;
  background-color: var(--ink);
  color: #f5f3ee;
  border-radius: var(--radius-inner);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.7;
  tab-size: 2;
}

.prose pre code {
  padding: 0;
  background: none;
  font-size: inherit;
}

.prose blockquote {
  padding-left: 16px;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
}

/* ---------- 滚动渐入(JS 启用时) ---------- */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 480ms var(--ease-out), transform 480ms var(--ease-out);
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.js .project-grid > [data-reveal]:nth-child(2) {
  transition-delay: 90ms;
}

/* ---------- 响应式 ---------- */

@media (max-width: 860px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
  }

  .site-nav {
    width: 100%;
  }

  .js .site-nav {
    width: auto;
  }

  .js .nav-toggle {
    display: inline-flex;
  }

  .js .nav-panel {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 32px rgb(25 23 22 / 0.08);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 180ms var(--ease-out), transform 180ms var(--ease-out),
      visibility 180ms;
  }

  .js .nav-panel.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px clamp(20px, 4vw, 32px) 20px;
  }

  .nav-link {
    width: 100%;
    padding-inline: 12px;
    font-size: 1rem;
  }

  .nav-link-external {
    margin-left: 0;
    margin-top: 8px;
    justify-content: center;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .oss-credit a,
  .about-body a,
  .spec-list a,
  .footer-line a,
  .crumbs a,
  .footer-sites a {
    display: inline-block;
    min-height: 44px;
    line-height: 44px;
    vertical-align: middle;
  }
}

@media (max-width: 480px) {
  .hero-actions .btn {
    width: 100%;
  }

  .footer-top {
    margin-left: 0;
  }
}

/* ---------- 减少动态 ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}