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

:root {
  --bern-red: #cc3333;
  --bern-yellow: #ffcc00;
  --bern-black: #111111;
  --bg-body: #f5f5f5;
  --bg-card: #ffffff;
  --border-subtle: #e5e7eb;
  --text-main: #111827;
  --text-muted: #6b7280;
  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.12);
  --radius-lg: 18px;
  --radius-pill: 999px;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #fef3c7 0, #f5f5f5 40%, #e5e7eb 100%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.app {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 960px;
  height: min(90vh, 720px);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.4);
  overflow: hidden;
}

.app-header {
  padding: 14px 18px 12px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: linear-gradient(
    135deg,
    #ffffff 0,
    #fff7ed 40%,
    #fee2e2 100%
  );
}

.header-main {
  flex: 2;
}

.app-header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  color: var(--bern-black);
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--text-muted);
}

.header-actions {
  flex: 3;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  flex-wrap: wrap;
}

.api-key-container {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 240px;
}

.api-key-container label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.api-key-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.api-key-container input {
  flex: 1;
  min-width: 140px;
  padding: 7px 10px;
  border-radius: 10px;
  border: 1px solid #d1d5db;
  background: #f9fafb;
  color: var(--text-main);
  font-size: 13px;
}

.api-key-container input:focus {
  outline: 2px solid rgba(204, 51, 51, 0.3);
  outline-offset: 1px;
  border-color: var(--bern-red);
  background: #ffffff;
}

.api-key-container button {
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  background: var(--bern-red);
  color: #ffffff;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.api-key-container button:hover {
  filter: brightness(1.05);
}

.status {
  font-size: 11px;
  color: #16a34a;
}

.ghost-button {
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.9);
  background: rgba(255, 255, 255, 0.8);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.ghost-button::before {
  content: "⟲";
  font-size: 13px;
}

.ghost-button:hover {
  background: #f9fafb;
}


.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}


.chat-window {
  flex: 1;
  min-height: 0;           
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.chat-messages {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.info-banner {
  text-align: center;
  padding: 14px 18px;
  background: #f3f4f6; 
  border-bottom: 1px solid #d1d5db;
  color: #374151;
  font-size: 14px;
  line-height: 1.5;
}

.info-banner p {
  margin: 6px 0;
}

.info-banner a {
  color: #1f2937;
  text-decoration: underline;
}

.info-banner a:hover {
  color: #000;
}

.message {
  max-width: 80%;
  padding: 10px 12px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.45;
  white-space: pre-wrap;
  background: #f9fafb;
  border: 1px solid rgba(209, 213, 219, 0.9);
}

.message.user {
  align-self: flex-end;
  background: var(--bern-red);
  color: #ffffff;
  border-color: rgba(0, 0, 0, 0.08);
  border-bottom-right-radius: 4px;
}

.message.assistant {
  align-self: flex-start;
  background: #ffffff;
  border-bottom-left-radius: 4px;
}

.message .meta {
  font-size: 11px;
  opacity: 0.7;
  margin-bottom: 4px;
}

.message.assistant > div:last-child {
  white-space: normal;
  line-height: 1.6;
}

.message.assistant h1,
.message.assistant h2,
.message.assistant h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--bern-black);
}

.message.assistant p {
  margin: 0 0 6px;
}


.message.assistant ul,
.message.assistant ol {
  margin: 4px 0 6px 18px;
  padding: 0;
}

.message.assistant li {
  margin-bottom: 2px;
}


.message.assistant code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
  padding: 1px 4px;
  border-radius: 4px;
  background: #f3f4f6;
}

.message.assistant pre {
  margin: 6px 0;
  padding: 8px 10px;
  border-radius: 8px;
  background: #0f172a;
  color: #e5e7eb;
  overflow-x: auto;
}


.message.assistant a {
  color: var(--bern-red);
  text-decoration: underline;
}


.input-area {
  border-top: 1px solid var(--border-subtle);
  padding: 10px 14px;
  background: #f9fafb;
}

#chatForm {
  display: flex;
  gap: 10px;
}

#userInput {
  flex: 1;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid #d1d5db;
  background: #ffffff;
  color: var(--text-main);
  font-size: 14px;
}

#userInput:focus {
  outline: 2px solid rgba(204, 51, 51, 0.3);
  outline-offset: 1px;
  border-color: var(--bern-red);
}

#chatForm button {
  border: none;
  padding: 0 18px;
  border-radius: var(--radius-pill);
  background: var(--bern-black);
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

#chatForm button::after {
  content: "➤";
  font-size: 13px;
}

#chatForm button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.chat-window::-webkit-scrollbar {
  width: 6px;
}

.chat-window::-webkit-scrollbar-track {
  background: transparent;
}

.chat-window::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 999px;
}


@media (max-width: 720px) {
  body {
    padding: 8px;
  }

  .app {
    height: 95vh;
    border-radius: 12px;
  }

  .app-header {
    flex-direction: column;
    align-items: stretch;
  }

  .header-actions {
    justify-content: space-between;
  }

  .message {
    max-width: 90%;
  }
}