frontend/src/App.css

:root {
  --bg: #121317;
  --panel: #202739;
  --panel-2: #1f2636;
  --panel-3: #242c3f;
  --line: rgba(255, 255, 255, 0.12);
  --text: #ffffff;
  --muted: #98a0b3;
  --brand: #4ecdc4;
  --brand-dark: #2c3e50;
}


/* Scroll elegante */
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(156, 169, 196, 0.45) transparent;
}

*::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(141, 156, 184, 0.75), rgba(118, 132, 160, 0.75));
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

*::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(170, 186, 219, 0.85), rgba(134, 151, 184, 0.85));
}

.sidebar {
  scrollbar-gutter: stable;
}

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

body {
  font-family: 'Segoe UI', 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app-container { display: flex; height: 100vh; background: var(--bg); }

.app-error-banner {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  min-width: 300px;
  max-width: 900px;
  width: calc(100% - 32px);
  background: rgba(102, 17, 17, 0.95);
  border: 1px solid rgba(255, 82, 82, 0.5);
  color: #ffe5e5;
  border-radius: 10px;
  padding: 12px 44px 12px 14px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.app-error-title {
  font-weight: 700;
  margin-bottom: 4px;
}

.app-error-close {
  position: absolute;
  top: 6px;
  right: 10px;
  border: none;
  background: transparent;
  color: #ffd6d6;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}

.app-error-close:hover {
  color: #ffffff;
}

.sidebar {
  width: 290px;
  background: linear-gradient(180deg, #242b3d 0%, #20283a 100%);
  border-right: 1px solid #343d52;
  overflow-y: auto;
  padding: 26px 12px;
}


.sidebar-toggle {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: #8aa6d8;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  margin-bottom: 8px;
}

.sidebar-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #b7c9e9;
}

.sidebar.collapsed {
  width: 64px;
  padding: 12px 8px;
  align-items: flex-start;
}

.sidebar.collapsed .sidebar-toggle {
  margin-bottom: 0;
}


.main-content { flex: 1; display: flex; flex-direction: column; }
.chat-history { height: 100%; }

.sidebar-title { color: var(--text); font-size: 32px; margin: 36px 0 22px; }
.sidebar-subtitle { color: var(--muted); margin-bottom: 10px; font-size: 16px; }

.new-chat-btn {
  width: 100%;
  min-height: 40px;
  padding: 8px 10px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  font-size: 13px;
  margin-bottom: 10px;
  transition: all 0.3s ease;
}

.new-chat-btn:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
}

.chat-list { display: flex; flex-direction: column; gap: 2px; }

.chat-item {
  min-height: 40px;
  padding: 8px 10px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
}

.chat-item:hover,
.chat-item.active {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
}

.chat-window { display: flex; flex-direction: column; height: 100%; }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.6rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  background-color: transparent;
}

.initial-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: auto;
  text-align: center;
  gap: 8px;
}

.brand-remote-logo {
  width: 140px;
  height: auto;
  margin-bottom: 4px;
}


.robocopy-title {
  color: #4ecdc4 !important;
  font-weight: bold;
  font-size: 48px;
  margin-bottom: 4px;
}

.brand-author.subtitle {
  font-size: 16px;
  color: #ffffff;
  margin-bottom: 14px;
}

.initial-menu p {
  color: var(--text);
  font-size: 16px;
  margin-bottom: 24px;
}
.initial-menu h1 { color: var(--brand); font-size: 44px; font-weight: 700; }
.brand-author { font-size: 30px; margin-bottom: 10px; }
.initial-menu p { color: var(--text); font-size: 16px; margin-bottom: 24px; }

.example-buttons {
  display: grid;
  grid-template-columns: repeat(4, minmax(150px, 1fr));
  gap: 12px;
  max-width: 850px;
}

.example-btn {
  width: 100%;
  min-height: 52px;
  white-space: normal;
  padding: 10px;
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 8px;
  font-size: 14px;
  color: white;
  text-align: center;
  margin: 5px 0;
  transition: all 0.3s ease;
  cursor: pointer !important;
}

.example-btn * { cursor: pointer !important; }

.example-btn:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-1px);
  box-shadow: none;
}

.message {
  display: flex;
  width: 100%;
  align-items: flex-end;
  gap: 8px;
}

.message .content {
  width: 100%;
  max-width: 900px;
  border-radius: 10px;
  line-height: 1.65;
  font-size: 18px;
}

.message.assistant,
.message.error {
  justify-content: flex-start;
}

.message .content {
  max-width: 900px;
  border-radius: 14px;
  line-height: 1.65;
  font-size: 16px;
}

.message.user .avatar {
  order: 2;
}

.message.user .content {
  order: 1;
  max-width: 72%;
}

.message.assistant .content,
.message.error .content {
  max-width: 86%;
}

.user-plain {
  background: rgba(78, 205, 196, 0.26);
  color: #dffaf7;
  padding: 12px 16px;
  border-radius: 16px;
  white-space: pre-wrap;
}

.assistant-markdown {
  color: #f4f6fb;
  white-space: pre-wrap;
  background: rgba(31, 38, 54, 0.96);
  padding: 12px 14px;
  border-radius: 12px;
}

.assistant-markdown p {
  margin: 0 0 14px;
}

.assistant-markdown h1,
.assistant-markdown h2,
.assistant-markdown h3 {
  margin: 22px 0 12px;
  line-height: 1.35;
}

.assistant-markdown ul,
.assistant-markdown ol {
  margin: 0 0 14px 22px;
}

.assistant-markdown hr {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  margin: 22px 0;
}

.message.user .content { padding-right: 0; }
.message.assistant .content { background: transparent; color: var(--text); padding-left: 0; }

.message.error .content {
  background: rgba(255, 82, 82, 0.15);
  border: 1px solid rgba(255, 82, 82, 0.35);
  padding: 10px 12px;
}

.error-plain {
  color: #ffd3d3;
  white-space: pre-wrap;
}

.chat-error-banner {
  width: 100%;
  border-radius: 10px;
  border: 1px solid rgba(255, 82, 82, 0.45);
  background: rgba(123, 23, 23, 0.4);
  color: #ffd8d8;
  padding: 10px 40px 10px 12px;
  position: relative;
}

.chat-error-close {
  position: absolute;
  top: 4px;
  right: 8px;
  border: 0;
  background: transparent;
  color: #ffd8d8;
  cursor: pointer;
  font-size: 20px;
}

.assistant-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.action-btn {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
  color: #d6ddeb;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
}

.action-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.action-btn.active {
  background: rgba(78, 205, 196, 0.24);
  border-color: #4ecdc4;
  color: #4ecdc4;
}

.message.loading { color: var(--muted); font-style: italic; margin-left: 40px; }

.input-area {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px 18px;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

.input-area input {
  flex: 1;
  height: 48px;
  padding: 0 16px;
  background: var(--panel-3);
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 16px;
}

.input-area input:focus { outline: none; border-color: var(--brand); }
.input-area input::placeholder { color: #9aa3b8; }

.input-ready {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: #1f6ed4;
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}

.send-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: #414b60;
  color: #bfc6d6;
  border: none;
  cursor: pointer;
  font-size: 20px;
}

.send-btn.active {
  background: #4ecdc4;
  color: #fff;
}

.send-btn:hover { background: #4e5a73; }
.send-btn.active:hover { background: #40bbb2; }
.send-btn:disabled { opacity: 0.6; cursor: not-allowed; }

@media (max-width: 768px) {
  .app-container { flex-direction: column; }

  .sidebar {
    width: 100%;
    max-height: 210px;
    border-right: none;
    border-bottom: 1px solid #343d52;
  }

  .sidebar-title { margin-top: 0; font-size: 22px; }

  .example-buttons { grid-template-columns: 1fr; }
}