:root {
  color-scheme: light;
  --bg: #f7f7f4;
  --surface: #ffffff;
  --surface-soft: #efefeb;
  --ink: #1a1c1a;
  --text: #414640;
  --muted: #6c726b;
  --line: #d2d5cf;
  --line-strong: #969d94;
  --link: #0b6b58;
  --link-hover: #074d40;
  --rust: #99512f;
  --focus: #0b6b58;
  --max-width: 1040px;
  --radius: 6px;
  --transition: 180ms ease;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #171917;
  --surface: #20231f;
  --surface-soft: #292d28;
  --ink: #f1f2ed;
  --text: #c9cec6;
  --muted: #9ba39a;
  --line: #3d433c;
  --line-strong: #697267;
  --link: #80cdb8;
  --link-hover: #afe4d5;
  --rust: #e2a07c;
  --focus: #80cdb8;
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  transition: background-color var(--transition), color var(--transition);
}

body,
button,
input {
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

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

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 60%, transparent);
  outline-offset: 3px;
}

::selection {
  background: var(--link);
  color: var(--surface);
}

.shell {
  width: min(var(--max-width), calc(100% - 48px));
  margin: 0 auto;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  transform: translateY(-160%);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 10px 14px;
  font-weight: 650;
  transition: transform var(--transition);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  display: grid;
  width: min(var(--max-width), calc(100% - 48px));
  min-height: 80px;
  margin: 0 auto;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.site-name {
  display: inline-flex;
  min-height: 44px;
  width: max-content;
  align-items: baseline;
  gap: 10px;
}

.site-name strong {
  font-size: 1.05rem;
  font-weight: 750;
}

.site-name span {
  color: var(--muted);
  font-size: 0.86rem;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.main-nav a,
.intro-links a,
.project-link,
.contact-links a,
.site-footer a {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
}

.main-nav a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration-color: transparent;
  text-underline-offset: 5px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
}

.header-tools {
  display: flex;
  justify-self: end;
  align-items: center;
  gap: 8px;
}

.language-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, 44px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.language-switch button,
.theme-toggle {
  min-width: 44px;
  min-height: 44px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  transition: background-color var(--transition), color var(--transition);
}

.language-switch button + button {
  border-left: 1px solid var(--line);
}

.language-switch button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--surface);
}

.theme-toggle {
  display: grid;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  place-items: center;
}

.theme-toggle:hover,
.language-switch button:hover {
  background: var(--surface-soft);
  color: var(--ink);
}

.theme-toggle svg,
.search-box svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

html[data-theme="light"] .sun-icon,
html[data-theme="dark"] .moon-icon {
  display: none;
}

.intro {
  padding: 88px 0 96px;
}

.intro-inner {
  max-width: 780px;
  margin-left: max(24px, calc((100vw - var(--max-width)) / 2));
  margin-right: auto;
}

.intro-note {
  margin: 0 0 18px;
  color: var(--rust);
  font-size: 0.88rem;
  font-weight: 700;
}

.intro h1,
.section-heading h2,
.simple-grid h2,
.contact-section h2 {
  margin: 0;
  letter-spacing: 0;
}

.intro h1 {
  max-width: 700px;
  font-size: 3.25rem;
  font-weight: 750;
  line-height: 1.1;
  text-wrap: balance;
}

.intro-lead {
  max-width: 720px;
  margin: 28px 0 0;
  color: var(--text);
  font-size: 1.32rem;
  line-height: 1.6;
  text-wrap: pretty;
}

.intro-body {
  max-width: 650px;
  margin: 18px 0 0;
  color: var(--muted);
  text-wrap: pretty;
}

.intro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
  margin-top: 30px;
}

.intro-links a,
.project-link,
.contact-links a,
.site-footer a {
  color: var(--link);
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--link) 28%, transparent);
  text-underline-offset: 4px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

.intro-links a:hover,
.project-link:hover,
.contact-links a:hover,
.site-footer a:hover {
  color: var(--link-hover);
  text-decoration-color: currentColor;
}

.section {
  border-top: 1px solid var(--line);
  padding: 88px 0 104px;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 48px;
}

.section-heading h2,
.simple-grid h2,
.contact-section h2 {
  font-size: 1.92rem;
  font-weight: 750;
  line-height: 1.25;
  text-wrap: balance;
}

.section-heading p,
.simple-grid > div:first-child > p,
.contact-section p {
  max-width: 500px;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  text-wrap: pretty;
}

.featured-projects {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.project-spotlight {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  min-height: 510px;
}

.spotlight-tabs {
  display: grid;
  align-content: start;
  border-right: 1px solid var(--line);
  background: var(--surface-soft);
}

.spotlight-tab {
  position: relative;
  display: grid;
  min-height: 116px;
  align-content: center;
  gap: 6px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  padding: 18px 22px;
  text-align: left;
  transition: background-color var(--transition), color var(--transition);
}

.spotlight-tab::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--tab-accent);
  content: "";
  transform: scaleY(0);
  transition: transform var(--transition);
}

.spotlight-tab:hover {
  background: var(--surface-soft);
}

.spotlight-tab[aria-selected="true"] {
  background: var(--surface);
  color: var(--ink);
}

.spotlight-tab[aria-selected="true"]::before {
  transform: scaleY(1);
}

.spotlight-tab[aria-selected="true"] span {
  color: var(--tab-accent);
}

.spotlight-tab span {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
}

.spotlight-tab strong {
  overflow-wrap: anywhere;
  font-size: 0.94rem;
  line-height: 1.4;
}

[data-category="embedded"] {
  --tab-accent: #b85f36;
}

[data-category="ai-hardware"] {
  --tab-accent: #3f7394;
}

[data-category="software"] {
  --tab-accent: #0b6b58;
}

[data-category="modeling"] {
  --tab-accent: #7a6b3a;
}

.spotlight-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(250px, 0.8fr);
  align-content: center;
  gap: 40px;
  padding: 44px;
  animation: spotlight-in 180ms ease-out;
}

@keyframes spotlight-in {
  from {
    opacity: 0.55;
    transform: translateY(4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.project-media {
  display: grid;
  min-width: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg);
  place-items: center;
  transition: border-color var(--transition), transform var(--transition);
}

.project-media:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

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

.project-copy {
  min-width: 0;
}

.project-kind,
.project-row-category {
  color: var(--rust);
  font-size: 0.78rem;
  font-weight: 700;
}

.project-copy h3 {
  margin: 10px 0 14px;
  font-size: 1.62rem;
  font-weight: 750;
  line-height: 1.3;
  text-wrap: balance;
}

.project-summary {
  margin: 0;
  color: var(--text);
  text-wrap: pretty;
}

.tech-line {
  margin: 20px 0 0;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.8rem;
  line-height: 1.65;
}

.project-actions,
.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin-top: 22px;
}

.archive-section {
  background: var(--surface);
}

.archive-heading {
  align-items: end;
}

.archive-heading > div > p {
  margin-top: 10px;
}

.project-count {
  white-space: nowrap;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 5px 10px;
  color: var(--text);
  font-size: 0.9rem;
}

.archive-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 280px) auto;
  gap: 12px;
  align-items: center;
  margin-bottom: 28px;
}

.filter-group {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  gap: 6px;
}

.filter-button,
.reset-button,
.detail-toggle {
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  padding: 8px 12px;
  font-size: 0.85rem;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

.filter-button:hover,
.reset-button:hover,
.detail-toggle:hover {
  border-color: var(--line);
  background: var(--surface-soft);
  color: var(--ink);
}

.filter-button.active {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--surface);
  font-weight: 700;
}

.search-box {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0 12px;
  color: var(--muted);
}

.search-box:focus-within {
  border-color: var(--focus);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--focus) 16%, transparent);
}

.search-box input {
  width: 100%;
  min-height: 44px;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 0.9rem;
}

.search-box input::placeholder {
  color: var(--muted);
}

.reset-button {
  border-color: var(--line-strong);
  color: var(--text);
}

.project-list {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.project-row {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
  border-bottom: 1px solid var(--line);
  padding: 27px 22px;
  transition: background-color var(--transition);
}

.project-row:hover {
  background: color-mix(in srgb, var(--surface-soft) 55%, transparent);
}

.project-row:last-child {
  border-bottom: 0;
}

.project-row-main {
  min-width: 0;
}

.project-row h3 {
  margin: 0 0 8px;
  overflow-wrap: anywhere;
  font-size: 1.1rem;
  font-weight: 720;
  line-height: 1.4;
}

.project-row-summary {
  max-width: 650px;
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.65;
  text-wrap: pretty;
}

.row-actions {
  min-width: max-content;
  justify-content: flex-end;
  margin-top: -8px;
}

.row-actions .project-link {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 550;
  text-decoration-color: transparent;
}

.row-actions .project-link:hover {
  color: var(--link);
  text-decoration-color: currentColor;
}

.detail-toggle {
  padding-right: 8px;
  padding-left: 8px;
}

.project-detail {
  grid-column: 2 / -1;
  border-left: 3px solid var(--link);
  background: var(--surface-soft);
  padding: 16px 18px;
}

.project-detail h4 {
  margin: 0 0 8px;
  font-size: 0.9rem;
}

.project-detail ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text);
  font-size: 0.9rem;
}

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

.empty-state {
  margin: 0;
  border-bottom: 1px solid var(--line);
  padding: 40px 0;
  color: var(--muted);
}

.archive-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
}

.archive-toggle,
.shuffle-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  padding: 8px 14px;
  font-size: 0.86rem;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

.archive-toggle:hover,
.shuffle-button:hover {
  border-color: var(--line-strong);
  background: var(--surface-soft);
  color: var(--link);
}

.archive-toggle[hidden] {
  display: none;
}

.shuffle-button {
  margin-left: auto;
  color: var(--link);
}

.shuffle-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.simple-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.62fr) minmax(0, 1.38fr);
  gap: 72px;
}

.simple-grid > div:first-child > p {
  margin-top: 14px;
}

.tool-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.tool-groups article {
  border-top: 2px solid var(--line-strong);
  padding-top: 20px;
}

.tool-groups article:last-child {
  border-top-color: var(--line-strong);
}

.tool-groups h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 750;
}

.tool-groups p {
  margin: 0;
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.86rem;
}

.about-section {
  background: var(--surface-soft);
}

.about-copy {
  max-width: 680px;
}

.about-copy p {
  margin: 0;
  color: var(--text);
  text-wrap: pretty;
}

.about-copy p + p {
  margin-top: 20px;
}

.contact-section {
  border-top: 1px solid var(--line);
  padding: 72px 0;
}

.contact-inner {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}

.contact-section p {
  margin-top: 10px;
}

.contact-links {
  display: grid;
  justify-items: end;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
}

.footer-inner {
  display: flex;
  min-height: 88px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

@media (max-width: 860px) {
  .site-header {
    grid-template-columns: 1fr auto;
    padding: 16px 0;
  }

  .main-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: flex-start;
    border-top: 1px solid var(--line);
    padding-top: 8px;
  }

  .project-spotlight {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .spotlight-tabs {
    display: flex;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    scroll-snap-type: x proximity;
    scrollbar-color: var(--line-strong) transparent;
    scrollbar-width: thin;
  }

  .spotlight-tab {
    min-width: 220px;
    min-height: 88px;
    border-right: 1px solid var(--line);
    border-bottom: 0;
    padding: 14px 16px;
    scroll-snap-align: start;
  }

  .spotlight-tab::before {
    top: auto;
    right: 0;
    bottom: 0;
    width: auto;
    height: 3px;
    transform: scaleX(0);
  }

  .spotlight-tab[aria-selected="true"]::before {
    transform: scaleX(1);
  }

  .spotlight-panel {
    grid-template-columns: 1fr;
    align-content: start;
    gap: 28px;
    padding: 28px;
  }

  .archive-controls {
    grid-template-columns: 1fr auto;
  }

  .filter-group {
    grid-column: 1 / -1;
  }

  .project-row {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .row-actions {
    grid-column: 2;
    justify-content: flex-start;
    margin-top: 0;
  }

  .project-detail {
    grid-column: 2;
  }

  .simple-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .tool-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  body {
    font-size: 16px;
  }

  .shell,
  .site-header {
    width: min(100% - 32px, var(--max-width));
  }

  .site-name {
    display: grid;
    gap: 0;
    line-height: 1.25;
  }

  .main-nav {
    gap: 18px;
  }

  .intro {
    padding: 64px 0 72px;
  }

  .intro-inner {
    width: min(100% - 32px, var(--max-width));
    margin: 0 auto;
  }

  .intro h1 {
    font-size: 2.35rem;
  }

  .intro-lead {
    margin-top: 22px;
    font-size: 1.12rem;
  }

  .intro-links {
    display: grid;
    gap: 0;
  }

  .section {
    padding: 64px 0 72px;
  }

  .section-heading,
  .archive-heading,
  .contact-inner {
    display: grid;
    gap: 12px;
    align-items: start;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .project-count {
    justify-self: start;
  }

  .spotlight-tab {
    min-width: 195px;
  }

  .spotlight-panel {
    padding: 20px;
  }

  .project-copy h3 {
    font-size: 1.3rem;
  }

  .archive-controls {
    grid-template-columns: 1fr auto;
  }

  .filter-group {
    gap: 4px;
  }

  .filter-button {
    padding-right: 9px;
    padding-left: 9px;
  }

  .search-box {
    min-width: 0;
  }

  .project-row {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 24px 16px;
  }

  .row-actions,
  .project-detail {
    grid-column: 1;
  }

  .row-actions {
    margin-top: 6px;
  }

  .project-detail {
    margin-top: 8px;
  }

  .tool-groups {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .tool-groups article {
    border-top-width: 1px;
    padding: 18px 0;
  }

  .contact-links {
    justify-items: start;
  }

  .footer-inner {
    display: grid;
    min-height: 104px;
    align-content: center;
    gap: 4px;
  }
}

@media (max-width: 380px) {
  .archive-controls {
    grid-template-columns: 1fr;
  }

  .reset-button {
    width: 100%;
  }
}

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