/* ============================================================
   Shared Future AI — Stylesheet
   ============================================================ */

/* ── Reset & Custom Properties ─────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #08090c;
  --bg-2: #0e1014;
  --bg-card: #111318;
  --bg-card-hover: #161920;
  --border: rgba(255, 255, 255, 0.07);
  --border-hover: rgba(255, 255, 255, 0.15);

  --text-primary: #f0f1f5;
  --text-secondary: #8b8f9e;
  --text-muted: #4a4e5f;

  --accent: #6c8fff;
  --accent-dim: rgba(108, 143, 255, 0.12);
  --accent-glow: rgba(108, 143, 255, 0.25);
  --accent-2: #a78bff;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;

  --radius: 12px;
  --radius-sm: 6px;
  --radius-lg: 20px;

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --max-width: 1100px;
  --section-gap: 120px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ── Utilities ──────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

.section {
  padding: var(--section-gap) 0;
}

.section-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 24px;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 64px;
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-display);
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #8aadff;
  border-color: #8aadff;
  transform: translateY(-1px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.04);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: rgba(108, 143, 255, 0.35);
}

.btn-outline:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
}

/* ── Navigation ─────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(8, 9, 12, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-color: var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: opacity var(--transition);
}

.nav-logo:hover { opacity: 0.8; }

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  display: block;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.logo-mark::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: block;
  padding: 7px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-links .nav-cta {
  color: var(--accent);
  border: 1px solid rgba(108, 143, 255, 0.3);
  padding: 7px 16px;
}

.nav-links .nav-cta:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 100px 40px 80px;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 760px;
}

.hero-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  font-family: var(--font-display);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 28px;
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 44px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: var(--font-display);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollPulse 2.5s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(0.7); }
}

/* ── Manifesto ──────────────────────────────────────────────── */
.manifesto {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.manifesto-intro {
  max-width: 720px;
}

.manifesto-intro p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.manifesto-intro p:last-child { margin-bottom: 0; }

.manifesto-bold {
  font-size: 1.3rem !important;
  font-family: var(--font-display);
  color: var(--text-primary) !important;
  font-weight: 600;
  line-height: 1.4;
}

.manifesto-intro strong { color: var(--text-primary); }
.manifesto-intro em { color: var(--accent); font-style: normal; }

/* ── Principles ─────────────────────────────────────────────── */
.principles { background: var(--bg); }

.principles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.principle-card {
  display: grid;
  grid-template-columns: 80px 1fr;
  background: var(--bg-card);
  transition: background var(--transition);
  cursor: default;
}

.principle-card:hover {
  background: var(--bg-card-hover);
}

.principle-card + .principle-card {
  border-top: 1px solid var(--border);
}

.principle-index {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 40px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  border-right: 1px solid var(--border);
  letter-spacing: 0.04em;
}

.principle-body {
  padding: 40px 44px;
}

.principle-body h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.3;
}

.principle-subtitle {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 20px;
  font-family: var(--font-display);
}

.principle-body p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  max-width: 620px;
}

.principle-body p:last-child { margin-bottom: 0; }
.principle-body em { color: var(--text-primary); font-style: normal; }

/* ── Research ───────────────────────────────────────────────── */
.research {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.research-item {
  background: var(--bg-card);
  padding: 36px 32px;
  transition: background var(--transition);
}

.research-item:hover {
  background: var(--bg-card-hover);
}

.research-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 20px;
  color: var(--accent);
  opacity: 0.85;
}

.research-item h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.3;
}

.research-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Vision ─────────────────────────────────────────────────── */
.vision {
  background: var(--bg);
  padding: 140px 0;
}

.vision-inner {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.vision-quote {
  margin-bottom: 40px;
  position: relative;
}

.vision-quote::before {
  content: '\201C';
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 8rem;
  font-family: Georgia, serif;
  color: var(--accent);
  opacity: 0.15;
  line-height: 1;
  pointer-events: none;
}

.vision-quote p {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.5vw, 1.5rem);
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.vision-quote footer {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.vision-coda {
  font-size: 1.1rem;
  color: var(--accent);
  font-style: italic;
  font-family: var(--font-display);
  font-weight: 500;
}

/* ── Team ───────────────────────────────────────────────────── */
.team { background: var(--bg-2); border-top: 1px solid var(--border); }

.team-placeholder {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 24px;
}

.team-placeholder p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ── Contact ────────────────────────────────────────────────── */
.contact {
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.contact-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color var(--transition), background var(--transition);
}

.contact-item:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.contact-item h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.contact-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.contact-link {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
  transition: color var(--transition);
}

.contact-link:hover {
  color: #8aadff;
  text-decoration: underline;
  text-decoration-color: rgba(138, 173, 255, 0.4);
  text-underline-offset: 3px;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 36px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo-mark {
  width: 22px;
  height: 22px;
  border-radius: 5px;
}

.footer-name {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Reveal Animations ──────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  :root { --section-gap: 80px; }

  .container { padding: 0 24px; }
  .nav-inner { padding: 0 24px; }
  .hero { padding: 100px 24px 80px; }

  .nav-links {
    display: none;
    position: fixed;
    inset: 68px 0 0 0;
    background: rgba(8, 9, 12, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    z-index: 999;
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    font-size: 1.1rem;
    padding: 12px 24px;
  }

  .nav-toggle { display: flex; }

  .principles-grid {
    border-radius: var(--radius);
  }

  .principle-card {
    grid-template-columns: 52px 1fr;
  }

  .principle-index {
    padding-top: 28px;
    font-size: 0.9rem;
  }

  .principle-body {
    padding: 28px 24px;
  }

  .research-grid {
    grid-template-columns: 1fr 1fr;
    border-radius: var(--radius);
  }

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

@media (max-width: 600px) {
  :root { --section-gap: 60px; }

  .principle-card {
    grid-template-columns: 1fr;
  }

  .principle-index {
    justify-content: flex-start;
    padding: 24px 24px 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .principle-body {
    padding: 20px 24px 28px;
  }

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

  .vision { padding: 80px 0; }
  .vision-quote::before { display: none; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero { padding: 90px 20px 70px; }
  .container { padding: 0 20px; }
  .nav-inner { padding: 0 20px; }
}

@media (max-width: 420px) {
  .br-desktop { display: none; }
  .hero-actions { flex-direction: column; align-items: center; }
}

/* ── Publications ───────────────────────────────────────────── */
.publications {
  background: var(--bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.pub-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), background var(--transition),
              box-shadow var(--transition);
}

.pub-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 0 40px rgba(108, 143, 255, 0.06);
}

.pub-card-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
  opacity: 0.7;
}

.pub-card-inner {
  padding: 40px 44px;
}

.pub-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.pub-venue {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 100px;
  background: var(--accent-dim);
  border: 1px solid rgba(108, 143, 255, 0.3);
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.pub-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pub-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.pub-title {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.pub-authors {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.5;
}

.pub-affiliations {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.pub-abstract {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 820px;
  margin-bottom: 32px;
  border-left: 2px solid rgba(108, 143, 255, 0.2);
  padding-left: 20px;
}

.pub-abstract em {
  color: var(--accent);
  font-style: normal;
}

.pub-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.pub-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 600;
  font-family: var(--font-display);
  letter-spacing: 0.01em;
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.pub-link svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.pub-link-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.pub-link-primary:hover {
  background: #8aadff;
  border-color: #8aadff;
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.pub-link-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}

.pub-link-ghost:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  transform: translateY(-1px);
}

@media (max-width: 900px) {
  .pub-card-inner {
    padding: 28px 28px;
  }
}

@media (max-width: 600px) {
  .pub-card-inner {
    padding: 24px 20px;
  }

  .pub-meta {
    gap: 8px;
  }

  .pub-abstract {
    padding-left: 14px;
  }
}