/* ===== CSS Variables ===== */
:root {
  --color-bg-primary: #1a1a1a;
  --color-bg-secondary: #222222;
  --color-bg-elevated: #2a2a2a;
  --color-text-primary: #bdb191;
  --color-text-secondary: #a9a076;
  --color-text-heading: #d0c2a5;
  --color-accent-primary: #537949;
  --color-accent-hover: #6ea262;
  --color-accent-dim: #2d3d28;
  --color-border: #333333;
  --font-mono: 'IBM Plex Mono', monospace;
  --max-width: 48rem;
}

/* ===== Reset ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== Base Typography ===== */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  position: relative;
  z-index: 1;
}

h1, h2, h3, h4 {
  color: var(--color-text-heading);
  font-weight: 500;
  line-height: 1.3;
}

h1 { font-size: 1.6rem; margin-bottom: 1rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.75rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover, a:focus {
  color: var(--color-accent-hover);
}

/* ===== Navigation ===== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(42, 42, 42, 0.85);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(4px);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  color: var(--color-text-heading);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
}

.nav-brand:hover {
  color: var(--color-accent-hover);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

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

.nav-links a.active {
  color: var(--color-accent-primary);
  border-bottom-color: var(--color-accent-primary);
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--color-border);
  background-color: rgba(42, 42, 42, 0.85);
  backdrop-filter: blur(4px);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
}

.footer-nist-logo {
  height: 2rem;
  width: auto;
  margin-bottom: 0.5rem;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.footer-nist-link:hover .footer-nist-logo {
  opacity: 1;
}

.footer-nist-links {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.5rem 1.5rem 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
  font-size: 0.65rem;
  line-height: 1.8;
}

.footer-nist-links a {
  color: var(--color-text-secondary);
  opacity: 0.5;
  transition: opacity 0.2s;
}

.footer-nist-links a:hover {
  opacity: 1;
  color: var(--color-text-primary);
}

.footer-nist-links a:not(:last-child)::after {
  content: ' · ';
  opacity: 0.3;
  pointer-events: none;
}

/* ===== Page Content ===== */
.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  background-color: rgba(26, 26, 26, 0.75);
  backdrop-filter: blur(2px);
  min-height: calc(100vh - 6rem);
}

/* ===== Landing Page ===== */
.landing .site-nav {
  position: absolute;
  width: 100%;
  background-color: transparent;
  border-bottom: none;
}

.landing .site-footer {
  background-color: rgba(42, 42, 42, 0.85);
}

.landing main {
  padding: 0;
  overflow: visible;
}

.landing-container {
  position: relative;
  width: 100%;
  padding: 8rem 1.5rem 1rem;
}

#ascii-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.landing-overlay {
  position: relative;
  z-index: 10;
  text-align: center;
  background: rgba(26, 26, 26, 0.7);
  padding: 2.5rem 3rem;
  border: 1px solid var(--color-border);
  max-width: 30rem;
  margin: 0 auto;
}

.landing-name {
  font-size: 2rem;
  color: var(--color-text-heading);
  margin-bottom: 0.5rem;
  letter-spacing: 0.08em;
}

.landing-tagline {
  color: var(--color-text-primary);
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.landing-affiliation {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
}

.landing-about-section {
  position: relative;
  z-index: 10;
}

.landing-about-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.5rem 1.5rem 2rem;
}

.landing-details {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1rem;
  text-align: left;
}

.landing-detail-col {
  flex: none;
}

.landing-detail-col:nth-child(2) {
  margin-left: 0;
}

.landing-detail-col h3 {
  margin-top: 1rem;
}

.landing-detail-col ul {
  list-style: none;
}

.landing-detail-col li {
  padding: 0.2rem 0;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.landing-detail-col li::before {
  content: '> ';
  color: var(--color-accent-primary);
}

/* ===== Sleeping Dog ===== */
.research-section {
  position: relative;
}

.sleeping-dog {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  display: inline-block;
  color: var(--color-text-secondary);
}

.dog-img {
  display: block;
  width: 10rem;
  height: auto;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.sleeping-dog a:hover .dog-img {
  opacity: 1.3;
}

.evie-float {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(75%, 25%);
  display: flex;
  gap: 0.15rem;
}

.evie-letter {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  animation: float-away 3s ease-in-out infinite;
  opacity: 0;
}

@keyframes float-away {
  0% {
    opacity: 0;
    transform: translateY(0);
  }
  15% {
    opacity: 0.8;
  }
  100% {
    opacity: 0;
    transform: translateY(-1.5rem);
  }
}

.research-section p.landing-footnote {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  margin-top: 1rem;
  text-align: left;
}

/* ===== Research / Code Pages ===== */
.research-section,
.code-project {
  background-color: rgba(26, 26, 26, 0.7);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.research-section h2,
.code-project h2 {
  margin-top: 0;
}

.research-section p {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.code-project .project-demo {
  display: block;
  max-width: 75%;
  margin: 1rem auto;
  border: 1px solid var(--color-border);
}

.code-project .frame-anim {
  display: block;
  max-width: 75%;
  margin: 1rem auto;
}

.code-project .frame-anim img {
  display: block;
  width: 100%;
  height: auto;
}

.code-project .frame-anim.blade-anim {
  max-width: 95%;
}

.code-project .project-links {
  margin-top: 1rem;
}

.code-project .project-links a {
  margin-right: 1rem;
}

/* ===== EVIE Chat Interface ===== */
.evie-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 8rem);
  max-height: 600px;
  background-color: rgba(34, 34, 34, 0.85);
  border: 1px solid var(--color-border);
}

.evie-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.evie-header-dog {
  position: relative;
  bottom: auto;
  right: auto;
}

.evie-header-dog .dog-img {
  width: 7rem;
}

.evie-header-dog:hover .dog-img { opacity: 1; filter: brightness(1.4); }

.ev... (placeholder)

.evie-header h2 {
  margin: 0;
  font-size: 1rem;
}

.evie-header .evie-subtitle {
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

.evie-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.evie-message {
  padding: 0.75rem 1rem;
  max-width: 85%;
  font-size: 0.8rem;
  line-height: 1.6;
}

.evie-message.agent {
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  align-self: flex-start;
}

.evie-message.user {
  background-color: var(--color-accent-dim);
  border: 1px solid var(--color-accent-primary);
  align-self: flex-end;
}

.evie-message .message-sender {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.evie-input-area {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-elevated);
}

.evie-input {
  flex: 1;
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.5rem 0.75rem;
  outline: none;
  transition: border-color 0.2s;
}

.evie-input:focus {
  border-color: var(--color-accent-primary);
}

.evie-input::placeholder {
  color: var(--color-text-secondary);
}

.evie-send {
  background-color: var(--color-accent-primary);
  border: 1px solid var(--color-accent-primary);
  color: var(--color-bg-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: background-color 0.2s;
  letter-spacing: 0.03em;
}

.evie-send:hover {
  background-color: var(--color-accent-hover);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .nav-inner {
    padding: 0.5rem 1rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a {
    font-size: 0.8rem;
  }

  .page-content {
    padding: 1.5rem 1rem;
  }

  .landing-overlay {
    padding: 1.5rem 1.5rem;
  }

  .landing-name {
    font-size: 1.5rem;
  }

  h1 { font-size: 1.3rem; }
  h2 { font-size: 1.1rem; }

  .landing-details {
    flex-direction: column;
    gap: 1rem;
  }

  .sleeping-dog {
    position: relative;
    bottom: auto;
    left: auto;
    justify-content: center;
    margin-top: 1rem;
  }
}