/* Base styles */
* { box-sizing: border-box; }
:root {
  --bg: #0a0f14;
  --fg: #e7f1ff;
  --muted: #9fb3c8;
  --accent: #5df2ff;
  --accent2: #ff5df2;
  --link: #8ad3ff;
  --underline: 3px solid var(--accent);
}
html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 600px at 50% -200px, #17212b 0%, var(--bg) 60%);
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  min-height: 100vh;
}
a { color: var(--link); text-decoration: none; }
header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  position: sticky;
  top: 0;
  background: rgba(10,15,20,.75);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
nav {
  display: flex;
  gap: 18px;
  align-items: center;
}
nav a {
  padding: 8px 10px;
  border-bottom: 3px solid transparent;
  font-weight: 600;
}
nav a.active {
  border-bottom: var(--underline);
}
.container {
  max-width: 960px;
  margin: 40px auto;
  padding: 0 20px 60px;
}
.neon {
  font-size: clamp(24px, 5vw, 44px);
  text-align: center;
  margin-top: 60px;
  color: #bff9ff;
  text-shadow:
    0 0 6px rgba(93,242,255,.9),
    0 0 18px rgba(93,242,255,.7),
    0 0 36px rgba(93,242,255,.5);
  animation: flicker 3.2s infinite;
}
.neon.small {
  font-size: clamp(14px, 2.2vw, 20px);
  line-height: 1.5;
  color: #fff;
  text-shadow:
    0 0 4px rgba(255,255,255,.6),
    0 0 10px rgba(93,242,255,.35);
  animation: flickerSoft 4.6s infinite;
}
@keyframes flicker {
  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% { opacity: 1; }
  20%, 24%, 55% { opacity: .35; }
}
@keyframes flickerSoft {
  0%, 100% { opacity: .92; filter: brightness(1); }
  40% { opacity: .86; filter: brightness(1.05); }
  60% { opacity: .98; filter: brightness(1.15); }
}
.main-hero {
  display: grid;
  place-items: center;
  min-height: 60vh;
}
.card {
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 14px;
  padding: 16px;
}
.list {
  display: grid;
  gap: 12px;
}
.back-link { display: inline-flex; align-items: center; gap: 8px; }
.back-symbol {
  font-size: 20px;
  display: inline-block;
  transform: translateY(-1px);
}
footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 30px 0 50px;
  border-top: 1px dashed rgba(255,255,255,.08);
  margin-top: 60px;
}
/* Chat styles */
.chat-window {
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 14px;
  padding: 10px;
  height: 60vh;
  overflow-y: auto;
  background: rgba(0,0,0,.25);
}
.message { margin: 8px 0; padding: 10px 12px; border-radius: 12px; max-width: 80%; }
.message.user { background: rgba(93,242,255,.1); align-self: flex-end; border: 1px solid rgba(93,242,255,.3); }
.message.assistant { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1); }
.chat-input {
  display: flex; gap: 8px; margin-top: 10px;
}
.chat-input input {
  flex: 1; padding: 10px 12px; border-radius: 10px; border: 1px solid rgba(255,255,255,.15); background: rgba(255,255,255,.06); color: var(--fg);
}
.chat-input button {
  padding: 10px 14px; border-radius: 10px; border: 1px solid rgba(255,255,255,.2); background: rgba(93,242,255,.08); color: var(--fg); cursor: pointer;
}
small.code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background: rgba(255,255,255,.06);
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,.12);
}