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

html {
  background: #ffffff;
}

html.dark {
  background: #0b0b0b;
}

body {
  background: #ffffff;
  color: #000000;
  font-family: system-ui, "Segoe UI", Roboto, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

body.dark {
  background: #0b0b0b;
  color: #e6eef8;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid #e9e9ea;
  display: flex;
  align-items: center;
  padding: 0 20px;
  overflow-x: auto;
  scrollbar-width: none;
}

nav::-webkit-scrollbar {
  display: none;
}

body.dark nav {
  background: #2a2a2a;
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.nav-brand {
  font-weight: 800;
  font-size: 14px;
  color: #000000;
  padding: 14px 16px 14px 0;
  border-right: 1px solid #e9e9ea;
  margin-right: 8px;
  white-space: nowrap;
  flex-shrink: 0;
}

body.dark .nav-brand {
  color: #e6eef8;
  border-right-color: rgba(255, 255, 255, 0.06);
}

nav a {
  display: block;
  padding: 14px 12px;
  font-size: 13px;
  color: #666666;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s;
}

nav a:hover {
  color: #000000;
}

nav a.active {
  color: #000000;
  border-bottom-color: #000000;
  font-weight: 700;
}

body.dark nav a {
  color: #9aa4b2;
}

body.dark nav a:hover {
  color: #e6eef8;
}

body.dark nav a.active {
  color: #e6eef8;
  border-bottom-color: #e6eef8;
}

.nav-right {
  margin-left: auto;
  padding-left: 16px;
  flex-shrink: 0;
}

.dark-toggle {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid #e9e9ea;
  background: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666666;
  font-size: 13px;
  font-weight: 700;
  transition: border-color 0.15s, color 0.15s;
}

.dark-toggle:hover {
  border-color: #000000;
  color: #000000;
}

body.dark .dark-toggle {
  background: #2a2a2a;
  border-color: rgba(255, 255, 255, 0.06);
  color: #9aa4b2;
}

body.dark .dark-toggle:hover {
  border-color: #e6eef8;
  color: #e6eef8;
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.hero {
  padding: 56px 0 48px;
  border-bottom: 1px solid #e9e9ea;
  margin-bottom: 40px;
}

body.dark .hero {
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.hero-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #999999;
  margin-bottom: 14px;
}

body.dark .hero-label {
  color: #555555;
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
  max-width: 580px;
}

body.dark .hero-desc {
  color: #9aa4b2;
}

.hero-meta {
  display: flex;
  gap: 32px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.hero-stat-val {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.hero-stat-key {
  font-size: 11px;
  color: #999999;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

body.dark .hero-stat-key {
  color: #555555;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #999999;
  white-space: nowrap;
}

body.dark .section-title {
  color: #555555;
}

.section-line {
  flex: 1;
  height: 1px;
  background: #e9e9ea;
}

body.dark .section-line {
  background: rgba(255, 255, 255, 0.06);
}

.section-wrap {
  margin-bottom: 48px;
}

.tech-strip {
  border: 1px solid #e9e9ea;
  border-radius: 10px;
  padding: 20px 24px;
  background: #ffffff;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

body.dark .tech-strip {
  background: #2a2a2a;
  border-color: rgba(255, 255, 255, 0.06);
}

.tech-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.tech-name {
  font-size: 13px;
  font-weight: 800;
  color: #000000;
}

body.dark .tech-name {
  color: #e6eef8;
}

.tech-desc {
  font-size: 12px;
  color: #666666;
  line-height: 1.55;
}

body.dark .tech-desc {
  color: #9aa4b2;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 12px;
}

@media (max-width: 620px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 26px;
  }
}

.card {
  border: 1px solid #e9e9ea;
  border-radius: 10px;
  background: #ffffff;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s, box-shadow 0.15s;
  overflow: hidden;
}

.card:hover {
  border-color: #000000;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
}

body.dark .card {
  background: #2a2a2a;
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark .card:hover {
  border-color: #e6eef8;
}

.card-header {
  padding: 16px 18px 14px;
  border-bottom: 1px solid #e9e9ea;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

body.dark .card-header {
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.card-title-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.card-title {
  font-size: 14px;
  font-weight: 800;
  color: #000000;
  line-height: 1;
}

body.dark .card-title {
  color: #e6eef8;
}

.card-sub {
  font-size: 12px;
  color: #999999;
}

body.dark .card-sub {
  color: #555555;
}

.card-year {
  font-size: 11px;
  font-weight: 700;
  color: #999999;
  flex-shrink: 0;
}

body.dark .card-year {
  color: #555555;
}

.card-body {
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.card-desc {
  font-size: 12px;
  color: #666666;
  line-height: 1.6;
}

body.dark .card-desc {
  color: #9aa4b2;
}

.card-rows {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.card-row {
  display: flex;
  gap: 10px;
  font-size: 12px;
}

.card-row-key {
  color: #999999;
  font-weight: 700;
  white-space: nowrap;
  min-width: 68px;
  flex-shrink: 0;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding-top: 1px;
}

body.dark .card-row-key {
  color: #555555;
}

.card-row-val {
  color: #333333;
  font-size: 12px;
  line-height: 1.5;
}

body.dark .card-row-val {
  color: #c8d4e0;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 12px 18px 14px;
  border-top: 1px solid #e9e9ea;
}

body.dark .card-tags {
  border-top-color: rgba(255, 255, 255, 0.06);
}

.tag {
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  background: #f0f0f0;
  color: #555555;
}

body.dark .tag {
  background: rgba(255, 255, 255, 0.07);
  color: #9aa4b2;
}

footer {
  border-top: 1px solid #e9e9ea;
  padding: 24px;
}

body.dark footer {
  border-top-color: rgba(255, 255, 255, 0.06);
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-brand {
  font-size: 13px;
  font-weight: 800;
  color: #000000;
}

body.dark .footer-brand {
  color: #e6eef8;
}

.footer-desc {
  font-size: 12px;
  color: #999999;
}

body.dark .footer-desc {
  color: #555555;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  font-size: 12px;
  color: #666666;
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: #000000;
}

body.dark .footer-links a {
  color: #9aa4b2;
}

body.dark .footer-links a:hover {
  color: #e6eef8;
}