/* ============================================
   AURA ENGINES — v1
   Decision Infrastructure for Capital
   ============================================ */

:root {
  --black: #000000;
  --bg: #080808;
  --bg-card: #0e0e0e;
  --bg-card-hover: #141414;
  --gold: #c9a84c;
  --gold-dim: #8a7033;
  --gold-glow: rgba(201, 168, 76, 0.15);
  --white: #eeeeee;
  --white-dim: #aaaaaa;
  --white-muted: #777777;
  --green: #2ecc71;
  --orange: #e67e22;
  --red: #c0392b;
  --border: #1e1e1e;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

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

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

body {
  background: var(--bg);
  color: var(--white);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  background: var(--gold);
  color: var(--black);
}

/* === TYPOGRAPHY === */

h1, h2, h3 {
  font-weight: 300;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: 1.1;
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  color: var(--gold);
  margin-bottom: 2.5rem;
}

h3 {
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--gold);
  margin-bottom: 0.75rem;
}

p {
  font-weight: 300;
  color: var(--white-dim);
  line-height: 1.8;
  max-width: 600px;
}

/* === LAYOUT === */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 7rem 0;
  border-bottom: 1px solid var(--border);
}

section:last-of-type {
  border-bottom: none;
}

/* === NAV === */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.5rem 0;
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s;
}

nav.scrolled {
  border-bottom-color: var(--border);
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--white-muted);
  text-decoration: none;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--white);
}

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.2rem;
  cursor: pointer;
}

/* === HERO === */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  padding: 0;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 50% 50%, rgba(201, 168, 76, 0.03) 0%, transparent 70%),
    radial-gradient(circle at 50% 120%, rgba(201, 168, 76, 0.02) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 168, 76, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 168, 76, 0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--white-muted);
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.hero h1 {
  color: var(--white);
  font-size: clamp(4.5rem, 10vw, 9rem);
  font-weight: 200;
  letter-spacing: 0.18em;
  margin-bottom: 1.8rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.7rem);
  font-weight: 300;
  letter-spacing: 0.16em;
  color: var(--gold-dim);
  text-transform: uppercase;
  margin-bottom: 4rem;
  line-height: 1.6;
}

.hero-signals {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-bottom: 3.5rem;
}

.signal-badge {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  padding: 0.8rem 2.5rem;
  border: 1px solid;
  text-transform: uppercase;
}

.signal-safe {
  color: var(--green);
  border-color: rgba(46, 204, 113, 0.3);
  background: rgba(46, 204, 113, 0.05);
  text-shadow: 0 0 20px rgba(46, 204, 113, 0.3);
}

.signal-prepare {
  color: var(--orange);
  border-color: rgba(230, 126, 34, 0.3);
  background: rgba(230, 126, 34, 0.05);
  text-shadow: 0 0 20px rgba(230, 126, 34, 0.3);
}

.signal-execute {
  color: var(--red);
  border-color: rgba(192, 57, 43, 0.3);
  background: rgba(192, 57, 43, 0.05);
  text-shadow: 0 0 20px rgba(192, 57, 43, 0.3);
}

.hero-desc {
  font-size: 0.95rem;
  color: var(--white-muted);
  max-width: 550px;
  margin: 0 auto 3.5rem;
  line-height: 1.9;
}

/* === BUTTONS === */

.btn {
  display: inline-block;
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 1.1rem 3rem;
  border: 1px solid var(--gold-dim);
  color: var(--gold);
  background: transparent;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.4s;
}

.btn:hover {
  background: var(--gold);
  color: var(--black);
  border-color: var(--gold);
}

/* === PHILOSOPHY === */

.philosophy-grid {
  display: grid;
  gap: 3rem;
  max-width: 700px;
}

.philosophy-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.philosophy-neg {
  font-size: 0.95rem;
  color: var(--white-muted);
  font-weight: 300;
  line-height: 1.8;
  text-decoration: line-through;
  text-decoration-color: rgba(136, 136, 136, 0.3);
}

.philosophy-pos {
  font-size: 0.95rem;
  color: var(--white);
  font-weight: 400;
  line-height: 1.8;
}

/* === SYSTEM OVERVIEW === */

.system-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.system-card {
  padding: 2.5rem 2rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: all 0.4s;
}

.system-card:hover {
  border-color: var(--gold-dim);
  background: var(--bg-card-hover);
}

.system-card-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--white-muted);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.system-card h3 {
  font-size: 1.15rem;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.system-card p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.system-card-indicator {
  width: 3rem;
  height: 2px;
  margin-bottom: 1.5rem;
}

.indicator-green { background: var(--green); box-shadow: 0 0 10px rgba(46, 204, 113, 0.4); }
.indicator-gold { background: var(--gold); box-shadow: 0 0 10px rgba(201, 168, 76, 0.4); }
.indicator-orange { background: var(--orange); box-shadow: 0 0 10px rgba(230, 126, 34, 0.4); }

.system-footnote {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--white-muted);
  margin-top: 3rem;
  font-style: italic;
}

/* === PIPELINE === */

.pipeline {
  display: flex;
  align-items: center;
  gap: 0;
  margin: 3rem 0;
  overflow-x: auto;
  padding-bottom: 1rem;
}

.pipeline-step {
  text-align: center;
  flex-shrink: 0;
}

.pipeline-step span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white-dim);
  padding: 0.8rem 1.5rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.pipeline-arrow {
  flex-shrink: 0;
  color: var(--gold-dim);
  font-size: 0.8rem;
  padding: 0 0.5rem;
}

.pipeline-caption {
  margin-top: 2rem;
}

.pipeline-caption p {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--white-muted);
  line-height: 2;
}

/* === OUTPUT === */

.output-list {
  list-style: none;
  display: grid;
  gap: 1.5rem;
}

.output-list li {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--white-dim);
}

.output-dot {
  width: 6px;
  height: 6px;
  background: var(--gold);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px rgba(201, 168, 76, 0.5);
}

/* === ACCESS SECTION === */

.access-section {
  text-align: center;
  padding: 6rem 0;
}

.access-section p {
  margin: 0 auto 1.5rem;
  text-align: center;
}

.access-lead {
  font-size: 1.1rem;
  color: var(--white);
  font-weight: 400;
  letter-spacing: 0.05em;
  margin-bottom: 1rem !important;
}

.access-section .btn {
  margin-top: 2rem;
}

/* === FOOTER === */

footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--white-muted);
  text-transform: uppercase;
}

.footer-right {
  display: flex;
  gap: 2rem;
}

.footer-right a {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--white-muted);
  text-decoration: none;
  text-transform: uppercase;
  transition: color 0.3s;
}

.footer-right a:hover {
  color: var(--gold);
}

/* === SYSTEM PAGE === */

.page-header {
  padding: 8rem 0 3rem;
  text-align: center;
}

.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

.page-header p {
  margin: 0 auto;
  text-align: center;
}

.layer-detail {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 4rem;
  align-items: start;
  max-width: 900px;
}

.layer-name {
  text-align: right;
}

.layer-name h3 {
  font-size: 1.2rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.layer-name .layer-tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--white-muted);
  text-transform: uppercase;
}

.layer-body p {
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.layer-features {
  list-style: none;
  display: grid;
  gap: 0.6rem;
}

.layer-features li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--white-muted);
  padding-left: 1.2rem;
  position: relative;
}

.layer-features li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--gold-dim);
}

/* === ACCESS PAGE === */

.access-form {
  max-width: 500px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--white-muted);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--white);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 300;
  outline: none;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--gold-dim);
}

.form-group textarea {
  height: 120px;
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--white-muted);
}

.form-note {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--white-muted);
  letter-spacing: 0.1em;
  text-align: center;
  margin-top: 2rem;
}

/* === FORM SELECT === */

.form-group select {
  width: 100%;
  padding: 0.8rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--white);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 300;
  outline: none;
  transition: border-color 0.3s;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23777' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  cursor: pointer;
}

.form-group select:focus {
  border-color: var(--gold-dim);
}

.form-group select option {
  background: var(--bg);
  color: var(--white);
}

/* === FORM SUCCESS === */

.form-success {
  text-align: center;
  padding: 3rem 0;
}

.form-success h3 {
  font-size: 1rem;
  color: var(--gold);
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
}

.form-success p {
  margin: 0 auto;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--white-muted);
}

/* === RESPONSIVE === */

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile-toggle { display: block; }

  nav.mobile-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(5, 5, 5, 0.95);
    backdrop-filter: blur(20px);
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border);
  }

  section { padding: 4rem 0; }

  .hero h1 {
    font-size: 3.5rem;
    letter-spacing: 0.12em;
  }

  .hero-subtitle {
    font-size: 1rem;
    letter-spacing: 0.1em;
    margin-bottom: 3rem;
  }

  /* CRITICAL: Vertical stack on mobile */
  .hero-signals {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .signal-badge {
    width: 200px;
    text-align: center;
    font-size: 0.9rem;
    padding: 0.8rem 2rem;
  }

  .hero-desc {
    font-size: 0.9rem;
    line-height: 2;
    padding: 0 1rem;
  }

  /* Larger CTA on mobile */
  .btn {
    font-size: 0.85rem;
    padding: 1.2rem 3rem;
    min-height: 52px;
  }

  .system-cards { grid-template-columns: 1fr; }

  .philosophy-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .philosophy-neg { font-size: 0.9rem; }
  .philosophy-pos { font-size: 0.9rem; }

  .pipeline { flex-wrap: wrap; gap: 0.5rem; justify-content: center; }
  .pipeline-arrow { display: none; }
  .pipeline-step span { font-size: 0.65rem; padding: 0.7rem 1.2rem; }
  .pipeline-caption p { font-size: 0.75rem; line-height: 2.2; }

  .output-list { gap: 1.8rem; }
  .output-list li { font-size: 0.9rem; }

  .access-section { padding: 4rem 0; }
  .access-lead { font-size: 1.05rem; }

  .layer-detail {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .layer-name { text-align: left; }

  footer .container { flex-direction: column; gap: 1rem; text-align: center; }
}