:root {
  color-scheme: dark;
  --bg: #05090a;
  --bg-2: #07110f;
  --panel: rgba(255, 255, 255, 0.07);
  --panel-strong: rgba(255, 255, 255, 0.11);
  --panel-border: rgba(255, 255, 255, 0.15);
  --text: #f4fbf7;
  --muted: #b6c8c1;
  --soft: #7f958c;
  --accent: #6df0a7;
  --accent-2: #6bc7ff;
  --warn: #f0c66d;
  --danger: #ff8e8e;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 8%, rgba(109, 240, 167, 0.18), transparent 28rem),
    radial-gradient(circle at 92% 12%, rgba(107, 199, 255, 0.16), transparent 25rem),
    radial-gradient(circle at 55% 85%, rgba(109, 240, 167, 0.08), transparent 30rem),
    linear-gradient(145deg, var(--bg-2) 0%, #0d1719 52%, var(--bg) 100%);
}

a { color: inherit; }

.shell {
  display: grid;
  grid-template-columns: 18rem minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 1.25rem;
  border-right: 1px solid var(--panel-border);
  background: rgba(5, 9, 10, 0.52);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--text);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid rgba(109, 240, 167, 0.35);
  border-radius: 0.85rem;
  background: rgba(109, 240, 167, 0.11);
  color: var(--accent);
  font-weight: 800;
  letter-spacing: -0.05em;
}

.brand strong { display: block; font-size: 0.98rem; }
.brand small { display: block; margin-top: 0.12rem; color: var(--soft); font-size: 0.78rem; }

.nav {
  display: grid;
  gap: 0.35rem;
  margin-top: 2rem;
}

.nav a {
  padding: 0.7rem 0.8rem;
  border: 1px solid transparent;
  border-radius: 0.8rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  transition: 160ms ease;
}

.nav a:hover,
.nav a.active {
  color: var(--text);
  border-color: var(--panel-border);
  background: rgba(255,255,255,0.07);
}

.sidebar-card {
  position: absolute;
  left: 1.25rem;
  right: 1.25rem;
  bottom: 1.25rem;
  padding: 1rem;
  border: 1px solid var(--panel-border);
  border-radius: 1rem;
  background: var(--panel);
}

.sidebar-card p { margin: 0; color: var(--muted); font-size: 0.86rem; line-height: 1.45; }
.sidebar-card p + p { margin-top: 0.35rem; }
.sidebar-card strong { color: var(--text); }
.status-dot { display: inline-block; width: 0.55rem; height: 0.55rem; margin-bottom: 0.7rem; border-radius: 50%; background: var(--accent); box-shadow: 0 0 1.5rem rgba(109,240,167,0.8); }

.main {
  width: min(100% - 3rem, 82rem);
  margin-inline: auto;
  padding: 2rem 0 4rem;
}

.topbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  padding: 1rem 0 2rem;
}

.eyebrow {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  max-width: 15ch;
  margin-bottom: 0;
  font-size: clamp(2.2rem, 4.5vw, 5.7rem);
  line-height: 0.94;
  letter-spacing: -0.075em;
}

h2 { margin-bottom: 0; font-size: clamp(1.55rem, 2.6vw, 2.4rem); line-height: 1.05; letter-spacing: -0.04em; }
h3 { margin-bottom: 0.55rem; font-size: 1.05rem; letter-spacing: -0.015em; }

.top-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.top-actions a, .citation-row a, .links a {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 0.55rem 0.75rem;
  background: rgba(255,255,255,0.04);
  font-size: 0.86rem;
}
.top-actions a:hover, .citation-row a:hover { color: var(--text); border-color: rgba(109,240,167,0.45); }

.interaction-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 23rem;
  gap: 1rem;
}

.chat-panel, .panel-card, .section-block {
  border: 1px solid var(--panel-border);
  border-radius: 1.4rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.10), rgba(255,255,255,0.045));
  box-shadow: 0 2rem 5rem rgba(0,0,0,0.24);
  backdrop-filter: blur(18px);
}

.chat-panel { min-height: 43rem; display: grid; grid-template-rows: auto 1fr auto; overflow: hidden; }
.chat-header { display: flex; align-items: start; justify-content: space-between; gap: 1rem; padding: 1.2rem 1.2rem 0.9rem; border-bottom: 1px solid var(--panel-border); }
.pill { display: inline-flex; align-items: center; border: 1px solid rgba(109,240,167,0.3); border-radius: 999px; padding: 0.35rem 0.6rem; color: var(--accent); background: rgba(109,240,167,0.08); font-size: 0.78rem; font-weight: 750; }

.messages { display: grid; align-content: start; gap: 1rem; padding: 1.25rem; }
.message { max-width: 48rem; padding: 1rem 1.1rem; border: 1px solid var(--panel-border); border-radius: 1.1rem; color: var(--muted); line-height: 1.58; }
.message p { margin: 0; }
.message p + p { margin-top: 0.8rem; }
.message.user { justify-self: end; max-width: 36rem; color: var(--text); background: rgba(109,240,167,0.10); border-color: rgba(109,240,167,0.23); }
.message.assistant { background: rgba(255,255,255,0.055); }
.message strong { color: var(--text); }

.citation-row { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1rem; }
.citation-row a { color: var(--accent); border-color: rgba(109,240,167,0.2); background: rgba(109,240,167,0.06); }

.composer { margin: 1.25rem; border: 1px solid rgba(109,240,167,0.18); border-radius: 1.05rem; background: rgba(0,0,0,0.2); overflow: hidden; }
textarea { width: 100%; min-height: 6rem; resize: vertical; padding: 1rem; border: 0; outline: 0; color: var(--text); background: transparent; font: inherit; }
textarea::placeholder { color: var(--soft); }
.composer-footer { display: flex; justify-content: space-between; gap: 1rem; padding: 0.8rem; border-top: 1px solid var(--panel-border); }
button { font: inherit; cursor: pointer; }
.upload-button, .send-button { border: 1px solid var(--panel-border); border-radius: 0.75rem; padding: 0.75rem 0.9rem; color: var(--muted); background: rgba(255,255,255,0.05); }
.send-button { min-width: 5rem; color: #06100d; border-color: transparent; background: var(--accent); font-weight: 800; }

.context-panel { display: grid; gap: 1rem; align-content: start; }
.panel-card { padding: 1.1rem; box-shadow: none; }
.panel-card p { color: var(--muted); line-height: 1.55; }
.dropzone { display: grid; place-items: center; min-height: 9rem; margin-top: 1rem; border: 1px dashed rgba(109,240,167,0.35); border-radius: 1rem; color: var(--muted); background: rgba(109,240,167,0.04); text-align: center; }
.dropzone span { display: grid; place-items: center; width: 2rem; height: 2rem; margin-bottom: 0.4rem; border-radius: 50%; color: var(--accent); border: 1px solid rgba(109,240,167,0.35); }
.dropzone p { margin: 0; }
.source-card ul { list-style: none; padding: 0; margin: 0.8rem 0 0; display: grid; gap: 0.55rem; }
.source-card li { display: flex; gap: 0.55rem; align-items: center; color: var(--muted); font-size: 0.9rem; }
.source-card li span { color: var(--accent); font-size: 0.72rem; font-weight: 850; }

.section-block { margin-top: 1rem; padding: clamp(1.3rem, 3vw, 2rem); }
.section-heading { max-width: 52rem; margin-bottom: 1.25rem; }
.section-heading p:not(.eyebrow), .muted { color: var(--muted); line-height: 1.65; }
.resource-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.85rem; }
.resource-card { min-height: 13rem; padding: 1rem; border: 1px solid var(--panel-border); border-radius: 1rem; background: rgba(255,255,255,0.05); }
.resource-card.primary-card { background: rgba(109,240,167,0.08); border-color: rgba(109,240,167,0.22); }
.resource-card p:not(.eyebrow) { color: var(--muted); line-height: 1.55; }
.two-col { display: grid; grid-template-columns: minmax(0, 0.75fr) minmax(20rem, 1fr); gap: 2rem; align-items: start; }
.question-list { display: grid; gap: 0.65rem; }
.question-list a { display: grid; gap: 0.25rem; padding: 1rem; border: 1px solid var(--panel-border); border-radius: 0.95rem; color: var(--text); text-decoration: none; background: rgba(255,255,255,0.05); }
.question-list a span { color: var(--accent); font-size: 0.76rem; font-weight: 850; letter-spacing: 0.08em; text-transform: uppercase; }
.guide-strip { display: grid; grid-template-columns: 21rem minmax(0, 1fr); gap: 2rem; align-items: center; }
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.7rem; }
.steps article { min-height: 8rem; padding: 1rem; border: 1px solid var(--panel-border); border-radius: 1rem; background: rgba(255,255,255,0.05); }
.steps span { color: var(--accent); font-weight: 850; }
.steps p { margin: 0.8rem 0 0; color: var(--muted); line-height: 1.45; }

@media (max-width: 1100px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .sidebar-card { position: static; margin-top: 1rem; }
  .nav { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .nav a { text-align: center; }
  .interaction-grid, .two-col, .guide-strip { grid-template-columns: 1fr; }
  .resource-grid, .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .main { width: min(100% - 1rem, 82rem); padding-top: 0.5rem; }
  .topbar { display: block; }
  .top-actions { margin-top: 1rem; }
  .nav { grid-template-columns: 1fr 1fr; }
  .interaction-grid { gap: 0.75rem; }
  .chat-panel { min-height: auto; }
  .resource-grid, .steps { grid-template-columns: 1fr; }
  .composer-footer { display: grid; }
}