*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #0f131a;
  --bg2: #0b0f15;
  --surface: rgba(25, 30, 41, 0.82);
  --surface2: rgba(35, 42, 57, 0.86);
  --surface3: rgba(18, 22, 31, 0.65);
  --text: rgba(238, 241, 246, 0.95);
  --muted: rgba(238, 241, 246, 0.7);
  --border: rgba(255, 255, 255, 0.10);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --accent: #7aa2ff;
  --accent2: #9ae6ff;
  --good: #8affa8;
  --bad: #ff6b8b;

  --radius: 18px;
  --radius2: 14px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --nav-h: 64px;

  --anim: 220ms;
  --anim2: 200ms;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text);
  background: radial-gradient(900px 500px at 20% 0%, rgba(122, 162, 255, 0.10), transparent 60%),
    radial-gradient(900px 500px at 80% 20%, rgba(154, 230, 255, 0.08), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid rgba(122, 162, 255, 0.75);
  outline-offset: 3px;
}

canvas {
  display: block;
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  opacity: 0.45;
}

section {
  scroll-margin-top: calc(var(--nav-h) + 14px);
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: var(--nav-h);
  padding: 0.8rem var(--gutter);
  background: rgba(15, 19, 26, 0.78);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 220px;
}

.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 0 3px rgba(122, 162, 255, 0.16);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.brand-name {
  font-weight: 800;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
}

.brand-sub {
  color: var(--muted);
  font-size: 0.78rem;
}

.topnav {
  display: flex;
  gap: clamp(0.7rem, 2vw, 1.1rem);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.topnav a {
  text-decoration: none;
  color: rgba(238, 241, 246, 0.76);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 0.35rem 0.55rem;
  border-radius: 10px;
  transition: background var(--anim2) ease, color var(--anim2) ease;
}

.topnav a:hover,
.topnav a:focus-visible {
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.92);
}

.channel {
  position: relative;
  z-index: 1;
  width: min(980px, calc(100vw - var(--gutter) * 2));
  margin: 0 auto;
  padding: clamp(1.1rem, 3vw, 1.8rem) 0 clamp(2.5rem, 6vw, 4rem);
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 3vw, 1.6rem);
}

.channel-head {
  padding: 1rem 0 0.35rem;
}

.channel-head h1 {
  margin: 0;
  font-size: clamp(1.5rem, 3.3vw, 2.25rem);
  letter-spacing: 0.01em;
}

.topic {
  margin: 0.45rem 0 0;
  color: var(--muted);
  max-width: 70ch;
}

.feed {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

@keyframes msgIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  opacity: 0;
  transform: translateY(8px);
  animation: msgIn var(--anim) ease-out forwards;
  animation-delay: calc(var(--i, 0) * 65ms);
}

.message.system {
  justify-content: center;
}

.sys {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius);
  border: 1px dashed rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(238, 241, 246, 0.78);
  text-align: center;
}

.sys strong {
  color: rgba(255, 255, 255, 0.92);
}

.sys .inline {
  color: rgba(154, 230, 255, 0.92);
  text-decoration: none;
  border-bottom: 1px solid rgba(154, 230, 255, 0.25);
  margin-left: 0.4rem;
}

.sys .inline:hover,
.sys .inline:focus-visible {
  border-bottom-color: rgba(154, 230, 255, 0.55);
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

.bubble {
  flex: 1;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 0.85rem 1rem;
  backdrop-filter: blur(14px);
  transition: background var(--anim2) ease, border-color var(--anim2) ease;
}

.bubble:hover {
  background: rgba(35, 42, 57, 0.78);
  border-color: rgba(255, 255, 255, 0.14);
}

.bubble.solo {
  margin-left: 52px;
}

.meta {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.name {
  font-weight: 800;
  letter-spacing: 0.01em;
}

.badge {
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  border: 1px solid rgba(154, 230, 255, 0.22);
  background: rgba(154, 230, 255, 0.08);
  color: rgba(154, 230, 255, 0.92);
  font-weight: 700;
}

.time {
  color: rgba(238, 241, 246, 0.58);
  font-size: 0.82rem;
}

.content {
  margin-top: 0.4rem;
  color: rgba(238, 241, 246, 0.88);
}

.muted {
  margin-top: 0.35rem;
  color: var(--muted);
}

.actions {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.86rem;
  transition: background var(--anim2) ease, border-color var(--anim2) ease, filter var(--anim2) ease;
}

.pill:hover,
.pill:focus-visible {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.22);
}

.pill.primary {
  border-color: rgba(122, 162, 255, 0.32);
  background: linear-gradient(135deg, rgba(122, 162, 255, 0.24), rgba(154, 230, 255, 0.10));
}

.attachments {
  margin-top: 0.85rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.7rem;
}

.card {
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: var(--surface2);
  padding: 0.9rem 0.95rem;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.38);
  transition: background var(--anim2) ease, border-color var(--anim2) ease;
}

.card:hover,
.card:focus-visible {
  background: rgba(35, 42, 57, 0.92);
  border-color: rgba(255, 255, 255, 0.16);
}

.card.small {
  cursor: default;
}

.card-title {
  font-weight: 900;
  letter-spacing: 0.01em;
  margin: 0;
}

.card-sub {
  margin-top: 0.35rem;
  color: rgba(238, 241, 246, 0.72);
  font-size: 0.92rem;
  line-height: 1.4;
}

.card-cta {
  margin-top: 0.7rem;
  color: rgba(154, 230, 255, 0.92);
  font-weight: 800;
}

.chips {
  margin-top: 0.7rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
  color: rgba(238, 241, 246, 0.86);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.82rem;
  transition: background var(--anim2) ease, border-color var(--anim2) ease;
}

.chip:hover,
.chip:focus-visible {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.layer {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.65rem 0.75rem;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
}

.layer-no {
  font-weight: 900;
  color: rgba(154, 230, 255, 0.92);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .brand {
    min-width: auto;
  }

  .bubble.solo {
    margin-left: 0;
  }

  .avatar {
    width: 40px;
    height: 40px;
    border-radius: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto;
  }

  .message {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .bubble,
  .pill,
  .chip,
  .card,
  .topnav a {
    transition: none;
  }
}