:root {
  --navy: #0d1f4e;
  --navy-light: #1a3366;
  --gold: #ffffff;
  --gold-dim: #c8d8f8;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-alt: #e8edf8;
  --text: #1a1a2e;
  --text-muted: #5a6080;
  --bubble-user: #0d1f4e;
  --bubble-user-text: #ffffff;
  --bubble-bot: #ffffff;
  --bubble-bot-text: #1a1a2e;
  --border: #d4ddf0;
  --shadow: 0 2px 8px rgba(13,31,78,0.10);
  --radius: 18px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Header ─────────────────────────────────────────── */
header {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: white;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.25);
  flex-shrink: 0;
}

header img.logo {
  height: 72px;
  width: auto;
  background: white;
  border-radius: 10px;
  padding: 4px;
}

.header-text h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--gold);
  text-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.header-text p {
  font-size: 0.82rem;
  color: #b3c0f7;
  margin-top: 2px;
}

#lang-select {
  margin-left: auto;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.28);
  color: white;
  font-size: 0.8rem;
  padding: 5px 10px;
  border-radius: 16px;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='rgba(255,255,255,0.6)'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 26px;
  flex-shrink: 0;
}
#lang-select:hover { background-color: rgba(255,255,255,0.20); }
#lang-select option { background: #0d1f4e; color: white; }

/* ── Status bar ─────────────────────────────────────── */
#status-bar {
  background: var(--navy);
  color: #b3c0f7;
  font-size: 0.78rem;
  padding: 6px 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  flex-shrink: 0;
  transition: opacity 0.3s;
}

#status-bar.hidden { opacity: 0; pointer-events: none; }

.spinner {
  width: 12px; height: 12px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Chat area ──────────────────────────────────────── */
#chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scroll-behavior: smooth;
}

.message {
  display: flex;
  flex-direction: column;
  max-width: 78%;
  animation: fadeIn 0.2s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

.message.user { align-self: flex-end; align-items: flex-end; }
.message.assistant { align-self: flex-start; align-items: flex-start; }

.bubble {
  padding: 12px 16px;
  border-radius: var(--radius);
  line-height: 1.6;
  font-size: 0.95rem;
  box-shadow: var(--shadow);
  word-break: break-word;
}

.message.user .bubble {
  background: var(--bubble-user);
  color: var(--bubble-user-text);
  border-bottom-right-radius: 4px;
}

.message.assistant .bubble {
  background: var(--bubble-bot);
  color: var(--bubble-bot-text);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border);
}

/* Markdown inside bubbles */
.bubble h1, .bubble h2, .bubble h3 {
  color: var(--navy);
  margin: 12px 0 6px;
  font-size: 1rem;
}
.bubble p { margin: 6px 0; }
.bubble ul, .bubble ol { padding-left: 20px; margin: 6px 0; }
.bubble li { margin: 3px 0; }
.bubble strong { color: var(--navy); }
.bubble a {
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.bubble a:hover { color: var(--gold-dim); }
.bubble code {
  background: var(--surface-alt);
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.88em;
}
.bubble blockquote {
  border-left: 3px solid var(--gold);
  padding-left: 12px;
  margin: 8px 0;
  color: var(--text-muted);
}

/* Sources card */
.sources-card {
  margin-top: 10px;
  background: var(--surface-alt);
  border: 1px solid #c5cae9;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.82rem;
}

.sources-card h4 {
  color: var(--navy);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
}

.sources-card .source-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 5px 0;
}

.source-tag {
  background: var(--navy);
  color: var(--gold);
  font-weight: 700;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 12px;
  white-space: nowrap;
  flex-shrink: 0;
}

.sources-card a {
  color: var(--navy-light);
  text-decoration: none;
  word-break: break-all;
}
.sources-card a:hover { text-decoration: underline; color: var(--gold-dim); }

/* Typing cursor */
.cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--navy);
  margin-left: 2px;
  animation: blink 0.9s step-end infinite;
  vertical-align: text-bottom;
}
@keyframes blink { 50% { opacity: 0; } }

/* Intro message */
.intro-bubble {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: white;
  padding: 18px 20px;
  border-radius: var(--radius);
  border-bottom-left-radius: 4px;
  box-shadow: var(--shadow);
  max-width: 78%;
}
.intro-bubble h2 { color: var(--gold); margin-bottom: 8px; font-size: 1rem; }
.intro-bubble p { font-size: 0.9rem; line-height: 1.6; color: #c5cae9; margin: 4px 0; }

/* Suggestions */
.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.suggestion-btn {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,215,0,0.4);
  color: var(--gold);
  padding: 7px 13px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.82rem;
  transition: background 0.2s;
}
.suggestion-btn:hover { background: rgba(255,215,0,0.15); }

/* ── Input area ─────────────────────────────────────── */
#input-area {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 14px 16px;
  flex-shrink: 0;
}

#input-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  max-width: 860px;
  margin: 0 auto;
}

#user-input {
  flex: 1;
  border: 1.5px solid var(--border);
  border-radius: 24px;
  padding: 11px 18px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: none;
  outline: none;
  max-height: 140px;
  line-height: 1.5;
  transition: border-color 0.2s;
}

#user-input:focus { border-color: var(--navy); }

#send-btn {
  background: var(--navy);
  color: white;
  border: none;
  border-radius: 50%;
  width: 46px;
  height: 46px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s, transform 0.1s;
}
#send-btn:hover:not(:disabled) { background: var(--navy-light); transform: scale(1.05); }
#send-btn:disabled { opacity: 0.45; cursor: not-allowed; }

#send-btn svg { width: 20px; height: 20px; }

#stop-btn {
  background: #c62828;
  color: white;
  border: none;
  border-radius: 50%;
  width: 46px;
  height: 46px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s, transform 0.1s;
}
#stop-btn:hover { background: #b71c1c; transform: scale(1.05); }

.disclaimer {
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 8px;
}
.disclaimer a { color: var(--navy); }

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 600px) {
  header { padding: 10px 14px; }
  header img.logo { height: 52px; }
  .header-text h1 { font-size: 1.2rem; }
  .header-badge { display: none; }
  .message { max-width: 92%; }
  #input-area { padding: 10px 10px; }
}