* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --obsidian: #0A0714;
  --deep-violet: #110B1F;
  --deep-indigo: #3D0099;
  --indigo-mid: #5C1ACC;
  --neural-electric: #7C3AED;
  --violet-warm: #B060E0;
  --amber: #D4872A;
  --cognition-gold: #E8A400;
  --gold-bright: #FFB800;
  --gold-light: #FFD466;
  --cortex-white: #F4F0FF;
  --synapse-cyan: #00D4FF;
  --text-primary: rgba(244, 240, 255, 0.9);
  --text-secondary: rgba(244, 240, 255, 0.5);
  --text-tertiary: rgba(244, 240, 255, 0.3);
  --text-faint: rgba(244, 240, 255, 0.12);
  --card-bg: rgba(124, 58, 237, 0.03);
  --card-border: rgba(124, 58, 237, 0.06);
  --card-bg-hover: rgba(124, 58, 237, 0.07);
  --card-border-hover: rgba(124, 58, 237, 0.18);
}
html { scroll-behavior: smooth; }
body { background: var(--obsidian); color: var(--cortex-white); font-family: 'Space Grotesk', sans-serif; overflow-x: hidden; -webkit-font-smoothing: antialiased; }

nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; display: flex; align-items: center; justify-content: center; padding: 0 40px; height: 72px; background: rgba(10, 7, 20, 0.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid rgba(124, 58, 237, 0.06); transition: all 0.4s ease; }
nav.scrolled { height: 60px; background: rgba(10, 7, 20, 0.95); border-bottom-color: rgba(124, 58, 237, 0.12); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; max-width: 1100px; }
.nav-logo { font-size: 16px; font-weight: 700; letter-spacing: 0.1em; text-decoration: none; flex-shrink: 0; background: linear-gradient(90deg, var(--deep-indigo), var(--neural-electric), var(--cognition-gold), var(--gold-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; gap: 36px; list-style: none; }
.nav-links a { font-size: 12px; font-weight: 400; letter-spacing: 0.2em; text-transform: uppercase; text-decoration: none; color: var(--text-secondary); transition: color 0.3s ease; position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--cortex-white); }
.nav-links a.active::after { content: ''; position: absolute; bottom: -6px; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, var(--neural-electric), var(--cognition-gold)); }
.nav-cta { font-size: 11px; font-weight: 600; letter-spacing: 0.2em; text-transform: uppercase; text-decoration: none; color: var(--gold-bright); border: 1px solid rgba(255,184,0,0.3); padding: 8px 24px; border-radius: 3px; flex-shrink: 0; transition: all 0.3s ease; }
.nav-cta:hover { border-color: rgba(255,184,0,0.6); background: rgba(255,184,0,0.06); }

.ambient { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.ambient::before { content: ''; position: absolute; width: 800px; height: 800px; top: -200px; left: 50%; transform: translateX(-50%); background: radial-gradient(circle, rgba(61,0,153,0.10) 0%, transparent 70%); animation: ambientPulse 8s ease-in-out infinite; }
.ambient::after { content: ''; position: absolute; width: 600px; height: 600px; bottom: 10%; right: -100px; background: radial-gradient(circle, rgba(255,184,0,0.05) 0%, transparent 70%); animation: ambientPulse 10s ease-in-out infinite reverse; }
@keyframes ambientPulse { 0%, 100% { opacity: 0.5; transform: translateX(-50%) scale(1); } 50% { opacity: 1; transform: translateX(-50%) scale(1.15); } }

.page { position: relative; z-index: 1; }
section { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 120px 24px 80px; max-width: 900px; margin: 0 auto; text-align: center; }
section.half { min-height: 60vh; }
section.auto { min-height: auto; padding: 80px 24px; }
.section-label { font-size: 11px; letter-spacing: 0.4em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 32px; }
.section-title { font-size: clamp(28px, 5vw, 52px); font-weight: 700; line-height: 1.15; margin-bottom: 24px; }
.section-title.sm { font-size: clamp(24px, 4vw, 42px); }
.gradient-text { background: linear-gradient(90deg, var(--neural-electric), var(--gold-bright)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.section-body { font-size: clamp(15px, 1.8vw, 18px); font-weight: 300; line-height: 1.9; color: var(--text-secondary); max-width: 600px; }

.arc-bar { width: 100%; max-width: 600px; height: 3px; border-radius: 2px; background: linear-gradient(90deg, var(--deep-violet) 0%, var(--deep-indigo) 25%, var(--neural-electric) 50%, var(--cognition-gold) 80%, var(--gold-light) 100%); position: relative; overflow: hidden; }
.arc-bar::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.4) 50%, transparent 100%); width: 40%; animation: shimmer 2s ease-in-out infinite; }
.arc-bar-sm { max-width: 200px; height: 2px; }
.arc-bar-wide { max-width: 750px; height: 2px; }
.arc-bar-micro { max-width: 120px; height: 2px; }
.arc-labels { display: flex; justify-content: space-between; width: 100%; max-width: 600px; font-size: 9px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-tertiary); margin-top: -28px; }
@keyframes shimmer { 0% { transform: translateX(-100%); } 100% { transform: translateX(350%); } }

.section-divider { width: 100%; max-width: 900px; margin: 0 auto; height: 1px; background: linear-gradient(90deg, transparent, rgba(124,58,237,0.12), transparent); }

.cta-btn { display: inline-block; padding: 16px 52px; border: 1px solid rgba(255,184,0,0.3); border-radius: 4px; color: var(--gold-bright); font-family: 'Space Grotesk', sans-serif; font-size: 13px; font-weight: 600; letter-spacing: 0.25em; text-transform: uppercase; text-decoration: none; cursor: pointer; background: transparent; transition: all 0.4s ease; position: relative; overflow: hidden; }
.cta-btn::before { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(61,0,153,0.12), rgba(255,184,0,0.12)); opacity: 0; transition: opacity 0.4s ease; }
.cta-btn:hover { border-color: rgba(255,184,0,0.6); transform: translateY(-2px); }
.cta-btn:hover::before { opacity: 1; }
.cta-btn-secondary { display: inline-block; padding: 14px 44px; border: 1px solid rgba(124,58,237,0.25); border-radius: 4px; color: var(--neural-electric); font-family: 'Space Grotesk', sans-serif; font-size: 13px; font-weight: 600; letter-spacing: 0.2em; text-transform: uppercase; text-decoration: none; cursor: pointer; background: transparent; transition: all 0.4s ease; }
.cta-btn-secondary:hover { border-color: rgba(124,58,237,0.5); background: rgba(124,58,237,0.06); transform: translateY(-2px); }
.text-link { font-size: 14px; font-weight: 400; letter-spacing: 0.1em; color: var(--text-secondary); text-decoration: none; transition: color 0.3s ease; }
.text-link:hover { color: var(--gold-bright); }

.hero { min-height: 100vh; gap: 40px; padding-top: 80px; }
.wordmark { font-size: clamp(42px, 8vw, 96px); font-weight: 700; letter-spacing: 0.12em; line-height: 1; user-select: none; background: linear-gradient(90deg, var(--deep-indigo), var(--neural-electric), var(--cognition-gold), var(--gold-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.tagline { font-size: clamp(14px, 2.2vw, 20px); font-weight: 300; letter-spacing: 0.35em; color: var(--text-secondary); text-transform: uppercase; }
.hero-sub { font-size: clamp(15px, 2vw, 18px); font-weight: 300; line-height: 1.8; color: var(--text-secondary); max-width: 560px; }
.scroll-hint { position: absolute; bottom: 40px; display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-tertiary); font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; animation: fadeInUp 1.5s ease 2s both; }
.scroll-hint .arrow { width: 1px; height: 30px; background: linear-gradient(to bottom, rgba(124,58,237,0.5), transparent); animation: scrollPulse 2s ease-in-out infinite; }
@keyframes scrollPulse { 0%, 100% { opacity: 0.3; transform: scaleY(1); } 50% { opacity: 1; transform: scaleY(1.3); } }

.stack-details { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 32px; width: 100%; max-width: 600px; text-align: left; }
.detail-item .detail-label { font-size: 11px; letter-spacing: 0.25em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 8px; }
.detail-item p { font-size: 14px; font-weight: 300; line-height: 1.7; color: var(--text-secondary); }

.arc-stages { display: flex; flex-direction: column; width: 100%; max-width: 700px; margin-top: 40px; }
.arc-stage { display: flex; align-items: center; gap: 24px; padding: 28px 0; border-bottom: 1px solid rgba(244,240,255,0.04); opacity: 0; transform: translateX(-20px); transition: all 0.6s ease; }
.arc-stage.visible { opacity: 1; transform: translateX(0); }
.arc-stage:last-child { border-bottom: none; }
.stage-dot { width: 14px; height: 14px; border-radius: 50%; flex-shrink: 0; }
.stage-number { font-size: 12px; font-weight: 500; color: var(--text-tertiary); letter-spacing: 0.1em; width: 24px; flex-shrink: 0; }
.stage-name { font-size: 17px; font-weight: 600; flex: 1; text-align: left; }
.stage-desc { font-size: 13px; color: var(--text-tertiary); text-align: right; flex: 1; font-weight: 300; }

.loop-visual { margin-top: 48px; padding: 48px 40px; border-radius: 16px; border: 1px solid rgba(124,58,237,0.08); background: rgba(124,58,237,0.03); max-width: 650px; width: 100%; }
.loop-row { display: flex; align-items: center; justify-content: center; gap: 24px; margin-bottom: 24px; }
.loop-row:last-child { margin-bottom: 0; }
.loop-node { padding: 16px 28px; border-radius: 8px; font-size: 14px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; text-align: center; min-width: 200px; }
.loop-node.ai { border: 1px solid rgba(124,58,237,0.3); color: var(--neural-electric); background: rgba(124,58,237,0.06); }
.loop-node.human { border: 1px solid rgba(255,184,0,0.3); color: var(--gold-bright); background: rgba(255,184,0,0.06); }
.loop-arrow { font-size: 20px; color: var(--text-tertiary); animation: arrowPulse 2s ease-in-out infinite; }
.loop-arrow.down { transform: rotate(90deg); }
@keyframes arrowPulse { 0%, 100% { opacity: 0.3; } 50% { opacity: 0.8; } }
.loop-caption { font-size: 13px; font-weight: 300; color: var(--text-tertiary); font-style: italic; text-align: center; }

.solutions-track { width: 100%; max-width: 740px; margin-top: 48px; }
.track-header { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; }
.track-label { font-size: 12px; font-weight: 600; letter-spacing: 0.25em; text-transform: uppercase; }
.track-line { flex: 1; height: 1px; }
.solutions-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; width: 100%; max-width: 740px; }
.solution-card { text-align: left; padding: 32px 28px; border-radius: 12px; border: 1px solid var(--card-border); background: var(--card-bg); transition: all 0.5s ease; }
.solution-card:hover { background: var(--card-bg-hover); border-color: var(--card-border-hover); transform: translateY(-3px); }
.solution-card .sol-icon { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; margin-bottom: 16px; font-weight: 500; }
.solution-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: var(--text-primary); }
.solution-card p { font-size: 13px; font-weight: 300; line-height: 1.7; color: var(--text-secondary); }

.contact-channels { display: flex; gap: 48px; margin-top: 16px; }
.contact-item { text-align: center; }
.contact-item .label { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 8px; }
.contact-item a { font-size: 15px; font-weight: 400; color: var(--text-secondary); text-decoration: none; transition: color 0.3s ease; }
.contact-item a:hover { color: var(--gold-bright); }
.contact-form { width: 100%; max-width: 500px; margin-top: 40px; display: flex; flex-direction: column; gap: 20px; }
.contact-form input, .contact-form textarea { width: 100%; padding: 14px 18px; border-radius: 6px; border: 1px solid rgba(124,58,237,0.12); background: rgba(124,58,237,0.04); color: var(--cortex-white); font-family: 'Space Grotesk', sans-serif; font-size: 14px; font-weight: 300; outline: none; transition: border-color 0.3s ease; }
.contact-form input::placeholder, .contact-form textarea::placeholder { color: var(--text-tertiary); }
.contact-form input:focus, .contact-form textarea:focus { border-color: rgba(124,58,237,0.35); }
.contact-form textarea { min-height: 140px; resize: vertical; }

.track-toggle-group { display: flex; gap: 16px; margin-top: 8px; justify-content: center; width: 100%; }
.track-toggle { flex: 1; padding: 18px 24px; border-radius: 8px; border: 1px solid rgba(124,58,237,0.12); background: rgba(124,58,237,0.04); color: var(--text-tertiary); font-family: 'Space Grotesk', sans-serif; font-size: 12px; font-weight: 400; letter-spacing: 0.2em; text-transform: uppercase; cursor: pointer; transition: all 0.35s ease; }
.track-toggle:hover { border-color: rgba(124,58,237,0.25); color: var(--text-secondary); background: rgba(124,58,237,0.06); }
.track-toggle.active { font-weight: 600; }

footer { text-align: center; padding: 60px 24px; max-width: 900px; margin: 0 auto; }
.footer-wordmark { font-size: 16px; font-weight: 700; letter-spacing: 0.12em; margin-bottom: 16px; background: linear-gradient(90deg, var(--deep-indigo), var(--neural-electric), var(--cognition-gold), var(--gold-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.footer-links { display: flex; justify-content: center; gap: 32px; margin-bottom: 24px; }
.footer-links a { font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; text-decoration: none; color: var(--text-tertiary); transition: color 0.3s ease; }
.footer-links a:hover { color: var(--text-secondary); }
.footer-copy { font-size: 11px; color: var(--text-faint); letter-spacing: 0.1em; }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.anim-1 { animation: fadeInUp 1s ease 0.3s both; }
.anim-2 { animation: fadeInUp 1s ease 0.6s both; }
.anim-3 { animation: fadeInUp 1s ease 0.9s both; }
.anim-4 { animation: fadeInUp 1s ease 1.2s both; }
.fade-in { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
  nav { padding: 0 20px; }
  .nav-links { gap: 20px; }
  .nav-links a { font-size: 10px; letter-spacing: 0.12em; }
  .nav-cta { display: none; }
  section { padding: 100px 20px 60px; }
  .solutions-grid { grid-template-columns: 1fr; }
  .stack-details { grid-template-columns: 1fr; }
  .arc-stage { flex-wrap: wrap; gap: 12px; }
  .stage-desc { text-align: left; flex: auto; width: 100%; padding-left: 50px; }
  .contact-channels { flex-direction: column; gap: 24px; }
  .loop-row { flex-direction: column; gap: 12px; }
  .arc-labels { font-size: 7px; letter-spacing: 0.1em; }
}
@media (max-width: 480px) {
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 9px; }
  .wordmark { letter-spacing: 0.06em; }
  .arc-labels { font-size: 6px; letter-spacing: 0.05em; }
}