:root {
  color-scheme: light;
  --bg-main: #f4f9ff;
  --bg-panel: #ffffff;
  --text: #13233a;
  --muted: #60758f;
  --border: #d3dfef;
  --primary: #0056b3;
  --primary-dark: #003f85;
  --user-grad: linear-gradient(140deg, #0056b3, #00a48e);
  --bot-bg: #edf4ff;
  --bot-border: #d6e5ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background:
    radial-gradient(circle at 0% 0%, rgba(0, 86, 179, 0.11), transparent 40%),
    radial-gradient(circle at 85% 100%, rgba(0, 164, 142, 0.11), transparent 45%),
    var(--bg-main);
}

.chat-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(240px, 320px) 1fr;
  gap: 16px;
  padding: 16px;
}

.chat-side {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(4, 41, 91, 0.08);
}

.chat-side h1 {
  margin-top: 0;
  margin-bottom: 10px;
}

.chat-side p {
  color: var(--muted);
  line-height: 1.6;
}

.chat-contact {
  font-size: 0.92rem;
  margin-top: -2px;
  margin-bottom: 12px;
  color: #305b8e;
  font-weight: 600;
}

.chat-side ul {
  margin-top: 18px;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}

.chat-main {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(4, 41, 91, 0.08);
}

.chat-top {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(140deg, #f6fbff, #f2fff9);
}

.chat-top strong {
  display: block;
  margin-bottom: 3px;
}

.chat-top-admission {
  display: block;
  color: #305b8e;
  margin-bottom: 4px;
  font-weight: 600;
}

#chat-status {
  color: var(--muted);
  font-size: 0.9rem;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
}

.msg-row {
  display: flex;
  margin-bottom: 12px;
}

.msg-row.user {
  justify-content: flex-end;
}

.msg {
  max-width: min(76ch, 85%);
  white-space: pre-wrap;
  line-height: 1.45;
  padding: 10px 13px;
  border-radius: 14px;
  font-size: 0.96rem;
}

.msg-row.bot .msg {
  background: var(--bot-bg);
  border: 1px solid var(--bot-border);
}

.msg-row.user .msg {
  color: #fff;
  background: var(--user-grad);
}

.chat-form {
  display: flex;
  gap: 10px;
  padding: 14px;
  border-top: 1px solid var(--border);
  background: #fff;
}

#chat-input {
  flex: 1;
  border: 1px solid #c8d7ec;
  border-radius: 12px;
  padding: 12px;
  font-size: 0.96rem;
  outline: none;
}

#chat-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.12);
}

#chat-send {
  border: 0;
  border-radius: 12px;
  background: linear-gradient(140deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-weight: 700;
  width: 98px;
  cursor: pointer;
}

#chat-send:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

@media (max-width: 900px) {
  .chat-shell {
    grid-template-columns: 1fr;
    padding: 10px;
  }

  .chat-side {
    display: none;
  }
}