:root {
  --ink-950: #071018;
  --ink-900: #0b1420;
  --ink-850: #101b29;
  --ink-800: #142132;
  --ink-700: #243246;
  --steel-500: #66758a;
  --steel-300: #aab6c5;
  --steel-150: #dce4ed;
  --paper: #f7f9fb;
  --white: #ffffff;
  --blue: #5aa7ff;
  --green: #7dd3a8;
  --amber: #d8b15d;
  --line: rgba(220, 228, 237, 0.16);
  --line-strong: rgba(220, 228, 237, 0.28);
  --surface: rgba(255, 255, 255, 0.055);
  --surface-strong: rgba(255, 255, 255, 0.085);
  --shadow: 0 22px 60px rgba(0, 0, 0, 0.28);
}



* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--paper);
  background: var(--ink-950);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  text-rendering: geometricPrecision;
}

a {
  color: inherit;
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(90, 167, 255, 0.1), transparent 36rem),
    linear-gradient(135deg, #071018 0%, #101724 46%, #0b1018 100%);
}

.page-bg::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 44%;
  background: linear-gradient(180deg, transparent, rgba(125, 211, 168, 0.06));
}

.grid-overlay {
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  min-height: 72px;
  padding: 0.9rem clamp(1rem, 4vw, 4rem);
  backdrop-filter: blur(18px);
  background: rgba(7, 16, 24, 0.84);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 750;
  white-space: nowrap;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  color: var(--paper);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.05));
}

.nav-links {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--steel-300);
  text-decoration: none;
  font-size: 0.93rem;
  font-weight: 650;
  border-radius: 8px;
  padding: 0.55rem 0.72rem;
  transition: color 180ms ease, background 180ms ease;
}

.nav-links a:hover {
  color: var(--paper);
  background: rgba(255, 255, 255, 0.06);
}

.section {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 5.5rem 0;
}

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
  padding-top: 2rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--green);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 890px;
  font-size: clamp(2.65rem, 6vw, 5.45rem);
  line-height: 1.02;
  letter-spacing: 0;
  margin-bottom: 1.45rem;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: 0;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.35rem;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.hero-text {
  max-width: 690px;
  color: var(--steel-300);
  font-size: 1.08rem;
  margin-bottom: 1.7rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.78rem 1rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 800;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn.primary {
  background: var(--paper);
  color: var(--ink-950);
}

.btn.secondary {
  border: 1px solid var(--line-strong);
  color: var(--paper);
  background: rgba(255, 255, 255, 0.045);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 760px;
  margin-top: 2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--line);
}

.hero-meta div {
  padding: 0.9rem 1rem;
  background: rgba(9, 18, 28, 0.74);
}

.hero-meta span {
  display: block;
  color: var(--steel-500);
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
}

.hero-meta strong {
  display: block;
  margin-top: 0.2rem;
  color: var(--paper);
  font-size: 0.92rem;
}

.hero-card,
.project-card,
.tab-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.035));
  box-shadow: var(--shadow);
}

.hero-card {
  position: relative;
  padding: 1.35rem;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(var(--blue), var(--green), var(--amber));
}

.card-topline,
.project-kicker {
  color: var(--amber);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}

.metric {
  display: grid;
  grid-template-columns: 2.6rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.metric span {
  font-weight: 900;
  color: var(--steel-500);
  font-variant-numeric: tabular-nums;
}

.metric p {
  color: var(--steel-150);
  margin-bottom: 0;
}

.section-heading {
  max-width: 800px;
  margin-bottom: 2rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.split p {
  color: var(--steel-300);
  font-size: 1.03rem;
}

.tabs {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.035);
}

.tab-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.tab-button {
  cursor: pointer;
  border: 1px solid var(--line);
  color: var(--steel-300);
  background: rgba(255, 255, 255, 0.035);
  border-radius: 8px;
  padding: 0.72rem 0.9rem;
  font-weight: 800;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.tab-button:hover {
  border-color: var(--line-strong);
  color: var(--paper);
}

.tab-button.active {
  background: var(--paper);
  color: var(--ink-950);
}

.tab-panel {
  display: none;
  padding: 1.35rem;
}

.tab-panel.active {
  display: block;
  animation: softIn 260ms ease both;
}

.tab-panel p {
  color: var(--steel-300);
  max-width: 820px;
  margin-bottom: 0;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.project-card {
  min-height: 280px;
  padding: 1.35rem;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: rgba(125, 211, 168, 0.45);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.05));
}

.project-card.featured {
  grid-row: auto;
}

.project-card.math-work {
  grid-column: auto;
  min-height: 280px;
}

.project-card p {
  color: var(--steel-300);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1.2rem 0;
}

.tags span {
  color: var(--steel-150);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.32rem 0.58rem;
  border-radius: 7px;
  font-size: 0.8rem;
  font-weight: 650;
}

.text-link {
  color: var(--green);
  text-decoration: none;
  font-weight: 900;
}

.text-link:hover {
  color: var(--paper);
}

.project-detail {
  padding-bottom: 3rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  margin-bottom: 2rem;
  color: var(--steel-300);
  text-decoration: none;
  font-weight: 750;
}

.back-link:hover {
  color: var(--paper);
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding-top: 0;
}

.detail-card {
  min-height: 240px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.35rem;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.032));
  box-shadow: var(--shadow);
}

.detail-card h2 {
  font-size: 1.45rem;
  margin-bottom: 0.75rem;
}

.detail-card p {
  color: var(--steel-300);
  margin-bottom: 0;
}

.detail-list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--steel-300);
}

.detail-list li + li {
  margin-top: 0.55rem;
}

.note-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
  gap: 1rem;
  padding-top: 0;
  min-width: 0;
}

.note-aside,
.note-body {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.032));
  box-shadow: var(--shadow);
}

.note-aside {
  align-self: start;
  padding: 1.2rem;
  position: sticky;
  top: 92px;
}

.note-body {
  padding: 1.45rem;
  overflow-wrap: break-word;
}

.note-body section + section {
  margin-top: 2.4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.note-body h2 {
  font-size: 1.55rem;
}

.note-body h3 {
  color: var(--steel-150);
  font-size: 1rem;
  margin-top: 1.4rem;
}

.note-body p,
.note-body li {
  color: var(--steel-300);
}

.note-body a {
  color: var(--green);
  text-decoration: none;
}

.math-block {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--steel-150);
  background: rgba(0, 0, 0, 0.18);
}

.result-box {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0;
  padding: 1rem;
  border-left: 3px solid var(--green);
  border-radius: 8px;
  background: rgba(125, 211, 168, 0.07);
}

.result-box strong {
  color: var(--paper);
}

.proof-block {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0 1.6rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--steel-300);
  background: rgba(255, 255, 255, 0.035);
}

.proof-block strong {
  color: var(--steel-150);
}

.note-body mjx-container {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.note-body mjx-container[display="true"] {
  display: block;
  padding-bottom: 0.25rem;
}

.contact {
  display: grid;
  grid-template-columns: 1fr 0.75fr;
  gap: 2rem;
  align-items: start;
  border-top: 1px solid var(--line);
}

.contact-links {
  display: grid;
  gap: 0.7rem;
}

.contact-links a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.95rem 1rem;
  color: var(--steel-150);
  background: rgba(255, 255, 255, 0.04);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.contact-links a:hover {
  transform: translateX(3px);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.075);
}

footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  color: var(--steel-500);
  border-top: 1px solid var(--line);
}

.reveal {
  opacity: 1;
  transform: translateY(0);
}

@keyframes softIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

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

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

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

@media (max-width: 860px) {
  .navbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.8rem;
  }

  .hero,
  .split,
  .project-grid,
  .detail-grid,
  .note-layout,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 4rem;
  }

  .note-aside {
    position: static;
  }
}

@media (max-width: 640px) {
  .section {
    width: min(100% - 1.25rem, 1120px);
    padding: 4rem 0;
  }

  .navbar {
    padding-inline: 0.75rem;
  }

  .brand span:last-child {
    white-space: normal;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .nav-links a {
    padding: 0.45rem 0.55rem;
  }

  h1 {
    font-size: 2.45rem;
  }

  .hero-meta {
    grid-template-columns: 1fr;
  }

  .tab-button {
    flex: 1 1 auto;
  }

  .note-body,
  .note-aside,
  .detail-card,
  .result-box,
  .proof-block,
  .math-block {
    padding: 0.9rem;
  }

  .note-body h2 {
    font-size: 1.35rem;
  }
}