:root {
  --bg: #f4f7fb;
  --ink: #14213d;
  --muted: #5f6f89;
  --line: rgba(20, 33, 61, .12);
  --card: rgba(255, 255, 255, .78);
  --accent: #1e88e5;
  --accent2: #24b47e;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 10%, rgba(36,180,126,.22), transparent 32%),
    radial-gradient(circle at 90% 0%, rgba(30,136,229,.22), transparent 35%),
    linear-gradient(135deg, #f8fbff, var(--bg));
}

.shell {
  width: min(1120px, calc(100% - 28px));
  margin: 0 auto;
  padding: 28px 0;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 20px;
}

.hero, .panel, .chat {
  border: 1px solid var(--line);
  background: var(--card);
  backdrop-filter: blur(18px);
  border-radius: 28px;
  box-shadow: 0 20px 60px rgba(20,33,61,.10);
}

.hero {
  min-height: 560px;
  padding: 34px;
  position: relative;
  overflow: hidden;
}

.badge {
  display: inline-flex;
  padding: 9px 13px;
  border-radius: 999px;
  background: rgba(30,136,229,.10);
  color: #0d5fa6;
  font-weight: 700;
  font-size: 14px;
}

h1 {
  margin: 36px 0 16px;
  font-size: clamp(38px, 6vw, 68px);
  line-height: .92;
  letter-spacing: -0.06em;
}

.hero p {
  max-width: 440px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}

.waves {
  position: absolute;
  inset: auto -120px -120px auto;
  width: 380px;
  height: 380px;
  border-radius: 42% 58% 65% 35%;
  background:
    linear-gradient(135deg, rgba(30,136,229,.22), rgba(36,180,126,.28)),
    url("data:image/svg+xml,%3Csvg width='240' height='240' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M10 90 Q 60 40 120 90 T230 90' fill='none' stroke='%23ffffff' stroke-width='10' opacity='.7'/%3E%3Cpath d='M10 135 Q 60 85 120 135 T230 135' fill='none' stroke='%23ffffff' stroke-width='10' opacity='.55'/%3E%3Cpath d='M10 180 Q 60 130 120 180 T230 180' fill='none' stroke='%23ffffff' stroke-width='10' opacity='.4'/%3E%3C/svg%3E");
}

.panel {
  align-self: start;
  padding: 28px;
}

.panel h2 { margin-top: 0; }

label {
  display: grid;
  gap: 8px;
  margin: 16px 0;
  color: var(--muted);
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.9);
  border-radius: 16px;
  padding: 15px 16px;
  font: inherit;
  color: var(--ink);
  outline: none;
}

input:focus {
  border-color: rgba(30,136,229,.55);
  box-shadow: 0 0 0 4px rgba(30,136,229,.12);
}

button {
  border: 0;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  padding: 14px 18px;
  transition: transform .15s, box-shadow .15s;
  box-shadow: 0 12px 26px rgba(30,136,229,.22);
}

button:hover { transform: translateY(-1px); }
button:disabled { opacity: .55; cursor: not-allowed; transform: none; }

.ghost {
  background: rgba(20,33,61,.07);
  color: var(--ink);
  box-shadow: none;
}

.hidden { display: none !important; }
.muted { color: var(--muted); min-height: 24px; }

.chat {
  min-height: 660px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.chatHeader {
  padding: 18px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.chatHeader div { display: grid; gap: 3px; }
.chatHeader span { color: var(--muted); font-size: 14px; }

.messages {
  padding: 18px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  max-width: 78%;
  padding: 12px 14px;
  border-radius: 18px;
  background: white;
  border: 1px solid var(--line);
  box-shadow: 0 8px 22px rgba(20,33,61,.06);
}

.msg.me {
  align-self: flex-end;
  background: linear-gradient(135deg, rgba(30,136,229,.96), rgba(36,180,126,.94));
  color: white;
}

.msg.system {
  align-self: center;
  max-width: 92%;
  background: rgba(255, 244, 210, .95);
  color: #735600;
}

.meta {
  display: flex;
  gap: 8px;
  opacity: .72;
  font-size: 12px;
  margin-bottom: 5px;
}

.text { white-space: pre-wrap; overflow-wrap: anywhere; }

.composer {
  padding: 18px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .hero { min-height: 360px; }
  .chat { min-height: 620px; }
  .msg { max-width: 92%; }
}

@media (max-width: 520px) {
  .shell { width: min(100% - 16px, 1120px); padding: 8px 0; }
  .hero, .panel, .chat { border-radius: 22px; }
  .hero, .panel { padding: 22px; }
  .composer { grid-template-columns: 1fr; }
}