:root {
  color-scheme: light;
  --bg: #f3f2ed;
  --bg-alt: #e8ede8;
  --ink: #192729;
  --ink-soft: #43595a;
  --muted: #5c706d;
  --accent: #426d63;
  --accent-strong: #31574e;
  --accent-tint: rgba(66, 109, 99, 0.09);
  --hairline: rgba(38, 70, 65, 0.18);
  --grid-line: rgba(45, 81, 73, 0.07);
  --surface: rgba(252, 253, 249, 0.84);
  --surface-strong: #fcfdf9;
  --beam: rgba(193, 215, 202, 0.36);
  --shadow: 0 20px 48px rgba(30, 59, 55, 0.07);
  --button-bg: #213a38;
  --button-ink: #f7faf6;
  --mx: 0;
  --my: 0;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0c1518;
  --bg-alt: #142326;
  --ink: #edf2ed;
  --ink-soft: #bdcec6;
  --muted: #90a69d;
  --accent: #a7cbbb;
  --accent-strong: #d1e6d9;
  --accent-tint: rgba(167, 203, 187, 0.12);
  --hairline: rgba(188, 219, 204, 0.19);
  --grid-line: rgba(184, 216, 199, 0.055);
  --surface: rgba(21, 36, 39, 0.89);
  --surface-strong: #1a2b2e;
  --beam: rgba(94, 152, 134, 0.16);
  --shadow: 0 24px 52px rgba(0, 0, 0, 0.24);
  --button-bg: #afd3bd;
  --button-ink: #0f211e;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--bg);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC",
    "Microsoft YaHei", sans-serif;
  transition: color 360ms ease, background-color 360ms ease;
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

section[id],
article[id] {
  scroll-margin-top: 104px;
}

.site-shell {
  position: relative;
  isolation: isolate;
  min-height: 100svh;
  padding: 24px clamp(20px, 4vw, 56px) 56px;
}

.hero-bg,
.hero-vignette,
.light-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.hero-bg {
  z-index: -3;
  inset: -18px;
  overflow: hidden;
  background: linear-gradient(108deg, var(--bg) 7%, var(--bg-alt) 100%);
  transform: translate3d(calc(var(--mx) * -8px), calc(var(--my) * -6px), 0);
  transition: transform 500ms ease-out, background 360ms ease;
}

.hero-bg::before,
.hero-bg::after,
.hero-vignette::before,
.hero-vignette::after {
  position: absolute;
  content: "";
}

.hero-bg::before {
  inset: 0;
  background:
    linear-gradient(90deg, transparent 0 59.9%, var(--hairline) 60%, transparent 60.1%),
    linear-gradient(0deg, transparent 0 15.9%, var(--hairline) 16%, transparent 16.1%);
  opacity: 0.72;
}

.hero-bg::after {
  top: -10%;
  bottom: -10%;
  left: 49%;
  width: 28%;
  background: linear-gradient(90deg, transparent, var(--beam) 48%, transparent);
  animation: beam-drift 17s ease-in-out infinite alternate;
}

.hero-vignette {
  z-index: -2;
  background:
    linear-gradient(90deg, var(--bg) 0%, transparent 62%),
    linear-gradient(0deg, var(--bg) 0%, transparent 23%);
  opacity: 0.45;
  transition: background 360ms ease;
}

.hero-vignette::before {
  top: 19%;
  right: 6.5%;
  width: min(31vw, 510px);
  height: 56%;
  border: 1px solid var(--hairline);
  border-right: 0;
  opacity: 0.58;
}

.hero-vignette::after {
  top: 26%;
  right: 6.5%;
  width: min(31vw, 510px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.4;
  animation: scan-line 12s ease-in-out infinite alternate;
}

.light-grid {
  z-index: -1;
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(90deg, transparent 8%, #000 64%);
  opacity: 0.8;
}

.navbar {
  position: sticky;
  top: 24px;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 20px;
  width: min(1240px, 100%);
  margin: 0 auto;
  padding: 18px 0;
  border-bottom: 1px solid var(--hairline);
  background: transparent;
  transition: background-color 260ms ease, border-color 260ms ease, padding 260ms ease;
}

.site-shell.is-scrolled .navbar {
  padding: 13px 18px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.nav-cluster {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(14px, 2.2vw, 32px);
  min-width: 0;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(12px, 1.8vw, 25px);
}

.nav-links a {
  position: relative;
  padding: 7px 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease;
}

.nav-links a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  content: "";
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}

.theme-toggle,
.lang-switch {
  flex: 0 0 auto;
  height: 36px;
  border: 1px solid var(--hairline);
  background: var(--surface);
}

.theme-toggle {
  appearance: none;
  display: inline-grid;
  place-items: center;
  width: 36px;
  padding: 0;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  transition: color 200ms ease, background-color 200ms ease, border-color 200ms ease;
}

.theme-toggle:hover {
  color: var(--button-ink);
  background: var(--button-bg);
  border-color: var(--button-bg);
}

.theme-icon {
  display: block;
  font-size: 18px;
  line-height: 1;
  transition: transform 300ms ease;
}

html[data-theme="dark"] .theme-icon {
  transform: rotate(90deg);
}

.lang-switch {
  display: inline-flex;
  align-items: stretch;
  padding: 3px;
  gap: 2px;
}

.lang-option {
  appearance: none;
  min-width: 30px;
  padding: 0 8px;
  color: var(--muted);
  background: transparent;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-size: 11px;
  font-weight: 750;
  transition: color 180ms ease, background-color 180ms ease;
}

.lang-option:hover,
.lang-option.active {
  color: var(--button-ink);
  background: var(--button-bg);
}

.home-hero {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  align-items: center;
  gap: clamp(44px, 6vw, 94px);
  width: min(1240px, 100%);
  margin: 0 auto;
  padding: clamp(100px, 12vh, 174px) 0 80px;
}

.hero-copy {
  max-width: 650px;
}

.identity-row {
  display: flex;
  align-items: center;
  gap: clamp(24px, 4vw, 58px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  margin: 0 0 26px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.16em;
  line-height: 1.4;
  text-transform: uppercase;
}

.eyebrow::before {
  display: block;
  width: 24px;
  height: 1px;
  content: "";
  background: currentColor;
}

h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(54px, 6.2vw, 88px);
  font-weight: 700;
  letter-spacing: -0.075em;
  line-height: 0.99;
  text-wrap: balance;
}

h1 span {
  display: block;
}

h1 small {
  display: block;
  margin-top: 16px;
  color: var(--accent);
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: 650;
  letter-spacing: 0.08em;
  line-height: 1.4;
}

.portrait-frame {
  flex: 0 0 clamp(126px, 12vw, 164px);
  width: clamp(126px, 12vw, 164px);
  margin: 0;
  padding: 7px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
  transition: transform 260ms ease, border-color 260ms ease;
}

.portrait-frame:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.portrait-frame img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--hairline);
}

.headline {
  max-width: 50ch;
  margin: 32px 0 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.78;
  text-wrap: pretty;
}

.headline.muted {
  margin-top: 13px;
  color: var(--muted);
  font-size: 14px;
}

.signal-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.signal-list span {
  display: inline-flex;
  align-items: center;
  min-height: 31px;
  padding: 0 10px;
  color: var(--accent-strong);
  background: var(--accent-tint);
  border: 1px solid var(--hairline);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.hero-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 112px;
  min-height: 44px;
  padding: 0 18px;
  color: var(--button-ink);
  background: var(--button-bg);
  border: 1px solid var(--button-bg);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: transform 180ms ease, color 180ms ease, background-color 180ms ease,
    border-color 180ms ease;
}

.hero-actions a:nth-child(2) {
  color: var(--ink);
  background: transparent;
  border-color: var(--hairline);
}

.hero-actions a:hover {
  transform: translateY(-3px);
}

.hero-actions a:nth-child(2):hover {
  color: var(--button-ink);
  background: var(--button-bg);
  border-color: var(--button-bg);
}

.portal-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-self: center;
}

.portal-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 178px;
  padding: 24px 22px;
  overflow: hidden;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
  text-decoration: none;
  backdrop-filter: blur(14px);
  transition: transform 240ms ease, border-color 240ms ease, background-color 240ms ease,
    box-shadow 240ms ease;
}

.portal-card::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  content: "";
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 280ms ease;
}

.portal-card::after {
  position: absolute;
  top: 18px;
  right: 20px;
  content: "↗";
  color: var(--muted);
  font-size: 18px;
  font-weight: 300;
  transition: color 180ms ease, transform 180ms ease;
}

.portal-card:hover {
  transform: translateY(-4px);
  background: var(--surface-strong);
  border-color: var(--accent);
  box-shadow: 0 26px 55px rgba(30, 59, 55, 0.11);
}

html[data-theme="dark"] .portal-card:hover {
  box-shadow: 0 26px 55px rgba(0, 0, 0, 0.3);
}

.portal-card:hover::before {
  transform: scaleY(1);
}

.portal-card:hover::after {
  color: var(--accent);
  transform: translate(2px, -2px);
}

.portal-index {
  width: fit-content;
  margin-bottom: auto;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.portal-title {
  display: block;
  margin-top: 24px;
  font-size: 20px;
  font-weight: 740;
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.portal-copy {
  display: block;
  max-width: 25ch;
  margin-top: 7px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.page-main {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
  width: min(1060px, 100%);
  margin: 0 auto;
  padding: clamp(90px, 11vh, 150px) 0 70px;
}

.page-heading {
  max-width: 850px;
}

.page-heading::before {
  display: block;
  width: 45px;
  height: 2px;
  margin-bottom: 25px;
  content: "";
  background: var(--accent);
}

.page-heading h1 {
  font-size: clamp(48px, 6vw, 82px);
}

.page-subtitle {
  max-width: 60ch;
  margin: 19px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.72;
  text-wrap: pretty;
}

.empty-panel,
.entry-panel {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  padding: 32px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  transition: transform 220ms ease, border-color 220ms ease, background-color 220ms ease;
}

.project-entry {
  grid-template-columns: 62px minmax(0, 1fr) auto;
  text-decoration: none;
}

.project-entry:not(.research-entry):hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  background: var(--surface-strong);
}

.research-entry {
  cursor: default;
}

.empty-index,
.entry-index {
  display: inline-grid;
  place-items: center;
  width: 54px;
  height: 54px;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid var(--hairline);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 15px;
  font-weight: 700;
}

.entry-index {
  color: var(--button-ink);
  background: var(--button-bg);
  border-color: var(--button-bg);
}

.entry-kicker {
  width: fit-content;
  margin: 0 0 11px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 740;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.empty-panel h2,
.entry-panel h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(20px, 2.2vw, 27px);
  font-weight: 720;
  letter-spacing: -0.035em;
  line-height: 1.3;
}

.empty-panel p,
.entry-panel p:not(.entry-kicker) {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.project-link {
  align-self: center;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

.project-link::after {
  content: " ↗";
}

.research-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-self: center;
  gap: 8px;
}

.research-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 12px;
  color: var(--accent-strong);
  background: transparent;
  border: 1px solid var(--hairline);
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 180ms ease, color 180ms ease, background-color 180ms ease,
    border-color 180ms ease;
}

.research-action-primary,
.research-action:hover {
  color: var(--button-ink);
  background: var(--button-bg);
  border-color: var(--button-bg);
}

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

@keyframes beam-drift {
  from {
    transform: translateX(-18%);
  }
  to {
    transform: translateX(34%);
  }
}

@keyframes scan-line {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(30vh);
  }
}

@keyframes enter-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-copy,
.page-heading,
.portal-grid,
.empty-panel,
.entry-panel {
  animation: enter-up 720ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.portal-grid,
.empty-panel,
.entry-panel {
  animation-delay: 100ms;
}

@media (max-width: 1050px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 11px;
  }

  .nav-cluster {
    width: 100%;
    justify-content: space-between;
  }

  .home-hero {
    grid-template-columns: 1fr;
    gap: 56px;
    padding-top: 92px;
  }

  .hero-copy {
    max-width: 740px;
  }

  .identity-row {
    gap: 28px;
  }

  .portal-grid {
    width: min(740px, 100%);
  }

  .hero-vignette::before,
  .hero-vignette::after {
    display: none;
  }
}

@media (max-width: 700px) {
  .site-shell {
    padding: 16px 18px 38px;
  }

  .navbar {
    top: 0;
    padding: 12px 0;
  }

  .site-shell.is-scrolled .navbar {
    margin: 0 -10px;
    padding: 12px 10px;
    width: calc(100% + 20px);
  }

  .nav-cluster {
    flex-wrap: wrap;
    gap: 10px;
  }

  .nav-links {
    justify-content: flex-start;
    width: 100%;
    gap: 7px 15px;
  }

  .home-hero {
    gap: 46px;
    padding: 70px 0 45px;
  }

  h1 {
    font-size: clamp(46px, 10vw, 64px);
  }

  h1 small {
    margin-top: 12px;
    font-size: 20px;
  }

  .portrait-frame {
    flex-basis: 126px;
    width: 126px;
  }

  .headline {
    margin-top: 27px;
    font-size: 15px;
  }

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

  .portal-card {
    min-height: 158px;
    padding: 20px 18px;
  }

  .page-main {
    padding-top: 72px;
  }

  .project-entry {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .project-link,
  .research-actions {
    grid-column: 2;
    justify-self: start;
  }
}

@media (max-width: 480px) {
  section[id],
  article[id] {
    scroll-margin-top: 140px;
  }

  .nav-links a {
    font-size: 12px;
  }

  .identity-row {
    align-items: flex-start;
    gap: 14px;
  }

  .portrait-frame {
    flex-basis: clamp(76px, 23vw, 96px);
    width: clamp(76px, 23vw, 96px);
    padding: 5px;
  }

  .home-hero h1 {
    font-size: clamp(37px, 10vw, 46px);
  }

  .portal-grid {
    grid-template-columns: 1fr;
    gap: 9px;
  }

  .portal-card {
    min-height: 124px;
  }

  .portal-title {
    margin-top: 16px;
  }

  .empty-panel,
  .entry-panel,
  .project-entry {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 24px;
  }

  .project-link,
  .research-actions {
    grid-column: 1;
  }

  .page-heading h1 {
    font-size: clamp(44px, 10vw, 58px);
  }

  .page-subtitle {
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero-bg {
    transform: none;
  }
}