@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap");

:root {
  --royal-700: #1840b0;
  --royal-600: #2459d6;
  --royal-500: #3975ff;
  --aqua-600: #0898b8;
  --aqua-500: #10b8dc;
  --aqua-400: #45d4f0;
  --accent-gradient: linear-gradient(135deg, var(--royal-600), var(--aqua-500));
}

:root[data-theme="dark"] {
  --page-bg: #03070f;
  --shell-bg: rgba(4, 12, 28, 0.96);
  --shell-line: rgba(80, 140, 255, 0.12);
  --panel-bg: rgba(6, 18, 42, 0.80);
  --panel-strong: rgba(5, 14, 36, 0.95);
  --card-bg: rgba(7, 20, 50, 0.72);
  --card-border: rgba(70, 130, 220, 0.15);
  --card-border-hover: rgba(70, 160, 255, 0.36);
  --card-highlight: rgba(60, 120, 255, 0.08);
  --text-main: #e8f2ff;
  --text-soft: rgba(200, 222, 255, 0.78);
  --text-faint: rgba(160, 198, 255, 0.55);
  --line-weak: rgba(80, 140, 255, 0.12);
  --line-strong: rgba(80, 160, 255, 0.28);
  --button-text: #ffffff;
  --viewer-bg: #020b1a;
  --pill-bg: rgba(6, 20, 52, 0.82);
  --pill-border: rgba(70, 130, 220, 0.18);
  --shadow-main: 0 40px 100px rgba(0, 8, 24, 0.6), 0 4px 24px rgba(0, 8, 24, 0.4);
  --shadow-card: 0 8px 32px rgba(0, 8, 30, 0.4);
  --ambient-one: rgba(50, 110, 255, 0.30);
  --ambient-two: rgba(10, 170, 210, 0.18);
  --ambient-three: rgba(40, 100, 220, 0.10);
  --noise-opacity: 0.025;
  --grid-opacity: 0.06;
}

:root[data-theme="light"] {
  --page-bg: #f3f7fe;
  --shell-bg: rgba(255, 255, 255, 0.96);
  --shell-line: rgba(36, 89, 214, 0.10);
  --panel-bg: rgba(255, 255, 255, 0.90);
  --panel-strong: rgba(248, 252, 255, 0.98);
  --card-bg: rgba(255, 255, 255, 0.95);
  --card-border: rgba(36, 89, 214, 0.10);
  --card-border-hover: rgba(36, 89, 214, 0.28);
  --card-highlight: rgba(36, 89, 214, 0.04);
  --text-main: #080f22;
  --text-soft: rgba(12, 28, 68, 0.72);
  --text-faint: rgba(28, 55, 120, 0.50);
  --line-weak: rgba(36, 89, 214, 0.10);
  --line-strong: rgba(36, 89, 214, 0.24);
  --button-text: #ffffff;
  --viewer-bg: #edf4ff;
  --pill-bg: rgba(240, 246, 255, 0.95);
  --pill-border: rgba(36, 89, 214, 0.14);
  --shadow-main: 0 24px 80px rgba(20, 55, 140, 0.10), 0 2px 12px rgba(20, 55, 140, 0.06);
  --shadow-card: 0 4px 20px rgba(20, 55, 140, 0.08);
  --ambient-one: rgba(36, 89, 214, 0.10);
  --ambient-two: rgba(10, 170, 210, 0.10);
  --ambient-three: rgba(36, 89, 214, 0.05);
  --noise-opacity: 0.012;
  --grid-opacity: 0.04;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-main);
  background: var(--page-bg);
  transition: background 300ms ease, color 300ms ease;
}

/* Subtle noise texture overlay */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  opacity: var(--noise-opacity);
  pointer-events: none;
  z-index: 9999;
}

a,
button,
.site-shell,
.surface-card,
.feature-card,
.info-card,
.paper-link,
.paper-viewer-card,
.theme-toggle,
.primary-nav a {
  transition: background-color 200ms ease, border-color 200ms ease, color 200ms ease,
    box-shadow 200ms ease, transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.site-shell {
  position: relative;
  width: min(1300px, 94vw);
  margin: 20px auto 32px;
  padding: 0;
  border-radius: 20px;
  border: 1px solid var(--shell-line);
  background: var(--shell-bg);
  box-shadow: var(--shadow-main);
  overflow: hidden;
  backdrop-filter: blur(20px) saturate(1.4);
}

/* Top accent line */
.site-shell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  z-index: 2;
}

/* Subtle dot grid */
.site-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--line-weak) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: var(--grid-opacity);
  pointer-events: none;
}

.ambient {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(80px);
  animation: float 20s ease-in-out infinite;
}

.ambient-one {
  width: 500px;
  height: 500px;
  top: -200px;
  right: -160px;
  background: radial-gradient(circle, var(--ambient-one), transparent 70%);
}

.ambient-two {
  width: 600px;
  height: 600px;
  left: -260px;
  bottom: -300px;
  background: radial-gradient(circle, var(--ambient-two), transparent 70%);
  animation-duration: 26s;
}

.ambient-three {
  width: 360px;
  height: 360px;
  top: 38%;
  right: 28%;
  background: radial-gradient(circle, var(--ambient-three), transparent 74%);
  animation-duration: 22s;
  animation-direction: reverse;
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

main {
  padding-bottom: 72px;
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 36px;
  border-bottom: 1px solid var(--line-weak);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: block;
  flex-shrink: 0;
}

.brand-logo {
  display: block;
  width: min(200px, 40vw);
  height: auto;
}

:root[data-theme="dark"] .brand-logo {
  filter: brightness(0) invert(1);
}

:root[data-theme="light"] .brand-logo {
  filter: none;
}

.brand-text-wrap {
  display: grid;
  gap: 2px;
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.brand-subtitle,
.section-kicker,
.footer-heading,
.signal-strip span,
.paper-badge,
.feature-head span,
.info-card span {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-subtitle {
  font-size: 0.64rem;
  color: var(--text-faint);
  letter-spacing: 0.12em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 5px;
  border: 1px solid var(--pill-border);
  border-radius: 999px;
  background: var(--pill-bg);
  backdrop-filter: blur(8px);
}

.primary-nav a {
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--text-soft);
  text-decoration: none;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--text-main);
  background: var(--card-highlight);
}

.primary-nav a.is-active {
  color: var(--text-main);
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 2px 12px rgba(36, 89, 214, 0.3);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--pill-border);
  border-radius: 999px;
  background: var(--pill-bg);
  color: var(--text-soft);
  cursor: pointer;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.70rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
}

.theme-toggle strong {
  color: var(--aqua-500);
  font-weight: 600;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--line-strong);
  color: var(--text-main);
}

.signal-strip {
  padding: 12px 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--line-weak);
  background: var(--card-highlight);
}

.signal-strip span,
.paper-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--pill-bg);
  color: var(--text-faint);
  font-size: 0.65rem;
  letter-spacing: 0.10em;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  text-transform: uppercase;
}

.page-hero {
  margin: 52px 36px 0;
  display: grid;
  gap: 28px;
}

.page-hero-home {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: start;
  gap: 40px;
}

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

.section-kicker {
  margin: 0;
  font-size: 0.68rem;
  color: var(--aqua-500);
  font-weight: 500;
  letter-spacing: 0.14em;
}

.page-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(2.4rem, 4.6vw, 3.8rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.page-lead {
  margin: 20px 0 0;
  max-width: 580px;
  color: var(--text-soft);
  line-height: 1.78;
  font-size: 1.02rem;
  font-weight: 400;
}

.hero-actions,
.cta-links {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button-link,
.cta-links a,
.cta-links span,
.contact-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.01em;
}

.button-link-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 8px 28px rgba(36, 89, 214, 0.35), 0 2px 8px rgba(36, 89, 214, 0.2);
}

.button-link-primary:hover,
.button-link-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(36, 89, 214, 0.45), 0 4px 12px rgba(36, 89, 214, 0.28);
}

.button-link-secondary,
.cta-links a,
.cta-links span,
.contact-link {
  border-color: var(--card-border);
  background: var(--pill-bg);
  color: var(--text-main);
  backdrop-filter: blur(8px);
}

.button-link-secondary:hover,
.button-link-secondary:focus-visible,
.cta-links a:hover,
.contact-link:hover {
  border-color: var(--card-border-hover);
  background: var(--card-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.domain-strip {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.domain-strip span {
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  background: var(--pill-bg);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--text-faint);
}

.hero-grid,
.info-grid,
.feature-grid {
  display: grid;
  gap: 16px;
}

.hero-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-content: start;
}

.info-grid {
  margin-top: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

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

.surface-card,
.info-card,
.feature-card,
.paper-link,
.paper-viewer-card {
  position: relative;
  border: 1px solid var(--card-border);
  border-radius: 16px;
  background: var(--card-bg);
  overflow: hidden;
  backdrop-filter: blur(8px);
}

.surface-card::before,
.info-card::before,
.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, var(--card-highlight), transparent 50%);
  pointer-events: none;
  border-radius: inherit;
}

.surface-card,
.info-card,
.feature-card {
  padding: 24px;
}

.surface-card:hover,
.info-card:hover,
.feature-card:hover,
.paper-link:hover,
.paper-viewer-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.surface-card h3,
.info-card h3,
.feature-card h2 {
  margin: 0;
  letter-spacing: -0.01em;
}

.surface-card p,
.info-card p,
.feature-card p,
.site-footer p {
  margin: 10px 0 0;
  color: var(--text-soft);
  line-height: 1.65;
  font-size: 0.94rem;
}

.feature-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.feature-head h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

.feature-head span,
.info-card span {
  font-size: 0.66rem;
  color: var(--aqua-500);
  font-weight: 600;
  letter-spacing: 0.12em;
  flex-shrink: 0;
  margin-top: 4px;
}

.feature-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.feature-list li {
  position: relative;
  padding-left: 18px;
  color: var(--text-soft);
  line-height: 1.55;
  font-size: 0.92rem;
}

.feature-list li::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-gradient);
}

.section {
  margin: 64px 36px 0;
}

.section-header {
  display: grid;
  gap: 10px;
  max-width: 820px;
  margin-bottom: 28px;
}

.section-header h2,
.cta-band h2 {
  margin: 0;
  font-size: clamp(1.7rem, 2.8vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.cta-band {
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 32px 36px;
  background: var(--panel-strong);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
  backdrop-filter: blur(10px);
}

.cta-band .section-kicker {
  margin-bottom: 8px;
  display: block;
}

.research-layout {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 16px;
}

.paper-index {
  display: grid;
  gap: 8px;
}

.paper-link {
  width: 100%;
  padding: 16px;
  text-align: left;
  color: var(--text-main);
  cursor: pointer;
  background: none;
}

.paper-link.is-active {
  border-color: rgba(36, 89, 214, 0.5);
  background: var(--card-bg);
  box-shadow: inset 0 0 0 1px rgba(36, 89, 214, 0.15);
}

.paper-link span {
  display: block;
}

.paper-domain {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.64rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.paper-title {
  margin-top: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.paper-date {
  margin-top: 8px;
  font-size: 0.76rem;
  color: var(--text-soft);
}

.paper-viewer-card {
  padding: 24px;
  background: var(--panel-strong);
}

.paper-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.paper-viewer-head h3 {
  margin: 16px 0 0;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.paper-viewer-head p {
  margin: 12px 0 0;
  color: var(--text-soft);
  line-height: 1.68;
  font-size: 0.96rem;
}

.paper-actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.paper-actions a {
  color: var(--aqua-500);
  text-decoration: none;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}

.paper-actions a:hover {
  color: var(--aqua-400);
}

.paper-frame-wrap {
  margin-top: 18px;
  min-height: 560px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  overflow: hidden;
  background: var(--viewer-bg);
}

.paper-frame-wrap iframe {
  display: block;
  width: 100%;
  min-height: 560px;
  border: 0;
}

.is-hidden {
  display: none !important;
}

.site-footer {
  margin: 56px 0 0;
  padding: 24px 36px 28px;
  border-top: 1px solid var(--line-weak);
  background: var(--card-highlight);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 0.8fr));
  gap: 24px;
}

.footer-column {
  display: grid;
  gap: 8px;
  align-content: start;
}

.footer-heading {
  font-size: 0.64rem;
  color: var(--text-faint);
  margin-bottom: 2px;
  letter-spacing: 0.12em;
}

.footer-column a {
  color: var(--text-soft);
  text-decoration: none;
  font-size: 0.90rem;
  font-weight: 500;
}

.footer-column a:hover,
.footer-column a:focus-visible {
  color: var(--aqua-500);
}

.footer-column p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.90rem;
  line-height: 1.65;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 700ms ease, transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--delay, 0) * 80ms);
}

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

@keyframes float {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(-20px, 16px, 0);
  }
}

/* ---- Responsive ---- */

@media (max-width: 1180px) {
  .page-hero-home,
  .feature-grid,
  .feature-grid-compact,
  .info-grid,
  .hero-grid,
  .research-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-band {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 920px) {
  .site-shell {
    width: min(1300px, 96vw);
    margin: 10px auto 20px;
    border-radius: 16px;
  }

  .header-bar {
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 22px;
  }

  .signal-strip {
    padding: 10px 22px;
  }

  .page-hero,
  .section {
    margin-left: 22px;
    margin-right: 22px;
  }

  .cta-band {
    padding: 24px 22px;
  }

  .site-footer {
    padding-left: 22px;
    padding-right: 22px;
  }

  .header-controls {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .primary-nav {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .theme-toggle {
    justify-content: space-between;
  }
}

@media (max-width: 720px) {
  .page-hero h1 {
    font-size: clamp(2rem, 9vw, 2.8rem);
  }

  .paper-frame-wrap,
  .paper-frame-wrap iframe {
    min-height: 420px;
  }
}

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

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}