:root {
  --space-2xs: 0.4rem;
  --space-xs: 0.72rem;
  --space-sm: 1rem;
  --space-md: 1.4rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4.5rem;
  --container-width: 1120px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  background:
    radial-gradient(circle at 10% -20%, rgba(18, 227, 255, 0.18), transparent 45%),
    radial-gradient(circle at 100% 10%, rgba(53, 194, 255, 0.14), transparent 38%),
    var(--color-surface);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
}

.background-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(53, 194, 255, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(53, 194, 255, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at center, black 48%, transparent 100%);
  animation: drift 22s linear infinite;
}

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

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.container {
  width: min(var(--container-width), calc(100% - 2.4rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(6, 11, 20, 0.78);
  border-bottom: 1px solid rgba(28, 51, 87, 0.72);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: linear-gradient(130deg, var(--color-primary), var(--color-accent));
  color: #00121d;
  font: 700 0.8rem/1 "JetBrains Mono", monospace;
}

.brand strong {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: 0.08em;
  font-size: 0.95rem;
}

.brand small {
  display: block;
  font-size: 0.72rem;
  color: var(--color-muted);
}

.main-nav {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.main-nav a {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--color-muted);
  font-size: 0.92rem;
  transition: color var(--motion-fast) var(--easing-standard),
    border-color var(--motion-fast) var(--easing-standard),
    background-color var(--motion-fast) var(--easing-standard);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
  border-color: rgba(53, 194, 255, 0.45);
  background: rgba(53, 194, 255, 0.12);
}

.page-main {
  padding-block: var(--space-xl) var(--space-2xl);
}

.section {
  margin-top: var(--space-2xl);
}

.hero {
  margin-top: var(--space-lg);
  padding: clamp(1.4rem, 3vw, 2.2rem);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(53, 194, 255, 0.28);
  background:
    linear-gradient(135deg, rgba(8, 16, 30, 0.9), rgba(12, 20, 36, 0.84)),
    linear-gradient(0deg, rgba(18, 227, 255, 0.1), rgba(18, 227, 255, 0.1));
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 10%, rgba(18, 227, 255, 0.13) 50%, transparent 90%);
  transform: translateX(-100%);
  animation: sweep 8s infinite;
  pointer-events: none;
}

.hero-eyebrow {
  color: var(--color-primary);
  font: 600 0.78rem/1 "JetBrains Mono", monospace;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0;
}

.hero h1 {
  margin: var(--space-xs) 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.8rem, 4.2vw, 3.2rem);
  line-height: 1.14;
  max-width: 18ch;
}

.hero-desc {
  max-width: 64ch;
  color: var(--color-muted);
  margin: 0;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.9rem;
  font-weight: 500;
  transition: transform var(--motion-fast) var(--easing-standard),
    background-color var(--motion-fast) var(--easing-standard),
    border-color var(--motion-fast) var(--easing-standard);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(120deg, var(--color-primary), var(--color-accent));
  color: #00111a;
}

.btn-ghost {
  border-color: rgba(53, 194, 255, 0.45);
  color: var(--color-text);
  background: rgba(53, 194, 255, 0.1);
}

.hero-metrics {
  margin-top: var(--space-lg);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-sm);
}

.hero-metrics article {
  border-radius: var(--radius-md);
  background: rgba(3, 10, 22, 0.62);
  border: 1px solid rgba(53, 194, 255, 0.22);
  padding: 0.9rem 1rem;
}

.hero-metrics strong {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.1rem;
  color: var(--color-primary);
}

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

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.section-head h1,
.section-head h2 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: 0.02em;
  font-size: clamp(1.45rem, 2.2vw, 2rem);
}

.section-head p {
  margin: 0;
  color: var(--color-muted);
}

.inline-link {
  color: var(--color-primary);
  font: 600 0.86rem/1.2 "JetBrains Mono", monospace;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-sm);
}

.capability-card {
  border-radius: var(--radius-md);
  border: 1px solid rgba(53, 194, 255, 0.22);
  background: linear-gradient(160deg, rgba(12, 21, 38, 0.92), rgba(7, 12, 22, 0.92));
  padding: 1rem;
}

.capability-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.05rem;
}

.capability-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.93rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
}

.project-card {
  background: linear-gradient(165deg, rgba(12, 21, 38, 0.88), rgba(8, 14, 26, 0.95));
  border: 1px solid rgba(53, 194, 255, 0.22);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--motion-normal) var(--easing-emphasis),
    border-color var(--motion-normal) var(--easing-standard),
    box-shadow var(--motion-normal) var(--easing-standard);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(18, 227, 255, 0.58);
  box-shadow: var(--shadow-lg);
}

.project-card-link {
  display: block;
}

.project-thumb-wrap {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.text-thumb {
  display: block;
  width: 100%;
  height: 100%;
}

.text-thumb .thumb-title {
  font-family: "Space Grotesk", sans-serif;
  font-size: 82px;
  font-weight: 700;
  letter-spacing: 4px;
  paint-order: stroke fill;
  stroke: rgba(18, 227, 255, 0.6);
  stroke-width: 1.2;
  stroke-dasharray: 620;
  stroke-dashoffset: 620;
  transition: stroke-dashoffset var(--motion-slow) var(--easing-emphasis);
}

.project-card:hover .text-thumb .thumb-title {
  stroke-dashoffset: 0;
}

.text-thumb .thumb-sub {
  font-family: "JetBrains Mono", monospace;
  font-size: 18px;
  letter-spacing: 2px;
}

.text-thumb .thumb-scan {
  stroke-dasharray: 30 12;
  animation: scan 2.6s linear infinite;
  opacity: 0.32;
}

.project-card:hover .text-thumb .thumb-scan {
  opacity: 1;
  animation-duration: 1.1s;
}

.project-body {
  padding: 0.95rem 1rem 1.1rem;
}

.project-headline {
  display: flex;
  justify-content: space-between;
  gap: var(--space-xs);
  align-items: center;
}

.chip {
  display: inline-flex;
  align-items: center;
  font: 600 0.75rem/1 "JetBrains Mono", monospace;
  color: var(--color-primary);
  border: 1px solid rgba(18, 227, 255, 0.3);
  border-radius: 999px;
  padding: 0.3rem 0.6rem;
  background: rgba(18, 227, 255, 0.08);
}

.year {
  color: var(--color-muted);
  font-size: 0.82rem;
}

.project-body h3 {
  margin: 0.7rem 0 0.35rem;
  font-size: 1.06rem;
}

.project-body p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
  margin: 0.85rem 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  border-radius: 999px;
  border: 1px solid rgba(53, 194, 255, 0.28);
  font-size: 0.76rem;
  color: #cde4ff;
  padding: 0.24rem 0.56rem;
  background: rgba(8, 20, 38, 0.95);
}

.timeline-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-sm);
}

.timeline-list li {
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(53, 194, 255, 0.24);
  background: rgba(10, 18, 33, 0.84);
}

.timeline-list li strong {
  display: block;
  margin-bottom: 0.44rem;
}

.timeline-list li span {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.timeline-list.compact {
  grid-template-columns: 1fr;
}

.empty-tip {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(255, 193, 75, 0.08);
  border: 1px solid rgba(255, 193, 75, 0.25);
  color: #ffd98f;
}

.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.category-filter a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(53, 194, 255, 0.3);
  color: var(--color-muted);
  background: rgba(10, 18, 33, 0.7);
  font-size: 0.86rem;
}

.category-filter a.active,
.category-filter a:hover {
  color: var(--color-text);
  border-color: rgba(18, 227, 255, 0.55);
  background: rgba(18, 227, 255, 0.16);
}

.project-detail .lead,
.single-page .lead {
  color: var(--color-muted);
  max-width: 70ch;
}

.meta-grid {
  margin-top: var(--space-md);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
}

.meta-grid article {
  border-radius: var(--radius-md);
  border: 1px solid rgba(53, 194, 255, 0.22);
  background: rgba(10, 18, 33, 0.8);
  padding: 0.95rem;
}

.meta-grid h3 {
  margin: 0;
  font: 600 0.8rem/1.2 "JetBrains Mono", monospace;
  color: var(--color-primary);
}

.meta-grid p {
  margin: 0.5rem 0 0;
  color: var(--color-text);
}

.detail-block {
  margin-top: var(--space-lg);
  border-top: 1px solid rgba(53, 194, 255, 0.2);
  padding-top: var(--space-md);
}

.detail-block h2 {
  margin: 0 0 0.8rem;
  font-family: "Space Grotesk", sans-serif;
}

.detail-block h3 {
  margin: 0 0 0.6rem;
}

.detail-list,
.highlight-list {
  margin: 0;
  padding-left: 1.1rem;
}

.detail-list li,
.highlight-list li {
  margin-bottom: 0.55rem;
}

.link-row {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.site-footer {
  margin-top: var(--space-2xl);
  border-top: 1px solid rgba(53, 194, 255, 0.2);
  background: rgba(5, 8, 14, 0.72);
}

.footer-inner {
  min-height: 88px;
  display: flex;
  gap: var(--space-sm);
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding-block: 1rem;
}

.footer-title {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
}

.footer-sub {
  margin: 0.3rem 0 0;
  color: var(--color-muted);
  font-size: 0.82rem;
}

.footer-record {
  border-top: 1px solid rgba(53, 194, 255, 0.08);
  padding: 0.5rem 0 0.85rem;
  text-align: center;
}

.footer-record a {
  font-size: 0.72rem;
  color: rgba(157, 176, 199, 0.62);
  letter-spacing: 0.01em;
}

.footer-record a:hover {
  color: rgba(157, 176, 199, 0.85);
}

.footer-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-muted);
  font-size: 0.84rem;
}

.footer-links a:hover {
  color: var(--color-primary);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: transform var(--motion-normal) var(--easing-standard),
    opacity var(--motion-normal) var(--easing-standard);
}

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

.reduced-motion * {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

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

@media (max-width: 1100px) {
  .project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .capability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .container {
    width: min(var(--container-width), calc(100% - 1.4rem));
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-block: 0.7rem;
  }

  .hero {
    padding: 1.2rem;
  }

  .hero-metrics,
  .meta-grid,
  .timeline-list,
  .capability-grid,
  .project-grid {
    grid-template-columns: 1fr;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-main {
    padding-block: var(--space-md) var(--space-xl);
  }

  .text-thumb .thumb-title {
    font-size: 66px;
  }
}

@keyframes drift {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(56px);
  }
}

@keyframes sweep {
  0% {
    transform: translateX(-120%);
  }
  50% {
    transform: translateX(120%);
  }
  100% {
    transform: translateX(120%);
  }
}

@keyframes scan {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: -84;
  }
}