/* ============================================================ */
/* Savannah UI — Layout                                        */
/* Sidebar + Header + Chat area — Odysseus-inspired, fresh    */
/* ============================================================ */

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; }
html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  font-family: var(--font-family);
  font-size: var(--font-size);
  line-height: var(--line-height);
  background: var(--bg);
  color: var(--fg);
  transition: background var(--transition-slow), color var(--transition-slow);
}

/* ── App Shell ── */
.savannah-app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr var(--input-bar-height);
  grid-template-areas:
    "sidebar  header"
    "sidebar  chat"
    "sidebar  inputbar";
  height: 100vh;
  width: 100vw;
  position: relative;
  overflow: hidden;
}

/* ── Background canvas (animations sit behind everything) ── */
#savannah-bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--bg-effect-intensity, 0.6);
}

/* ── Sidebar ── */
.sidebar {
  grid-area: sidebar;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 10;
  overflow: hidden;
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  height: var(--header-height);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  text-decoration: none;
  color: var(--accent);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.05em;
  transition: color var(--transition);
}

.sidebar-brand svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.sidebar-brand:hover { color: var(--accent-hover); }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-section-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  padding: 10px 10px 4px;
  font-weight: 600;
}

.sidebar-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--border-radius-sm);
  border: none;
  background: transparent;
  color: var(--fg);
  font-family: var(--font-family);
  font-size: 13px;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.75;
}

.sidebar-btn:hover {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}

.sidebar-btn:hover svg { opacity: 1; }

.sidebar-btn.active {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--accent);
  font-weight: 600;
}

.sidebar-btn.active svg { opacity: 1; }

.conv-item.active {
  background: color-mix(in srgb, var(--accent) 14%, transparent) !important;
}

.sidebar-footer {
  padding: 12px 8px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ── Header ── */
.header {
  grid-area: header;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
  z-index: 9;
  transition: background var(--transition-slow);
}

.header-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--fg);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-subtitle {
  font-size: 12px;
  color: var(--muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* Leo status badge */
.leo-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.leo-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-success);
  animation: leo-pulse 2.5s ease-in-out infinite;
}

@keyframes leo-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* ── Chat Area ── */
.chat {
  grid-area: chat;
  overflow-y: auto;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 1;
  scroll-behavior: smooth;
}

.chat-inner {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Empty state */
.chat-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-align: center;
  color: var(--muted);
  padding: 40px 20px;
  pointer-events: none;
}

.chat-empty-logo {
  width: 56px;
  height: 56px;
  opacity: 0.6;
}

.chat-empty-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
  opacity: 0.7;
}

.chat-empty-sub {
  font-size: 13px;
  max-width: 340px;
  opacity: 0.6;
  line-height: 1.7;
}

/* ── Messages ── */
.msg {
  display: flex;
  gap: 10px;
  padding: 4px 0;
  animation: msg-in 0.2s ease;
}

@keyframes msg-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg-user { flex-direction: row-reverse; }

.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 20%, var(--panel));
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.msg-body {
  background: var(--leo-bubble);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 10px 14px;
  max-width: 80%;
  font-size: 14px;
  line-height: 1.65;
  transition: background var(--transition-slow);
}

.msg-user .msg-body {
  background: var(--user-bubble);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}

.msg-body p:first-child { margin-top: 0; }
.msg-body p:last-child  { margin-bottom: 0; }

.msg-meta {
  font-size: 10px;
  color: var(--muted);
  margin-top: 4px;
  padding: 0 2px;
}

/* Typing indicator */
.msg-typing .msg-body {
  padding: 12px 16px;
}

.typing-dots {
  display: flex;
  gap: 4px;
  align-items: center;
  height: 16px;
}

.typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--muted);
  animation: typing-bounce 1.2s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.18s; }
.typing-dots span:nth-child(3) { animation-delay: 0.36s; }

@keyframes typing-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40% { transform: translateY(-5px); opacity: 1; }
}

/* ── Input Bar ── */
.input-bar {
  grid-area: inputbar;
  background: var(--panel);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 12px 20px;
  gap: 10px;
  z-index: 9;
  transition: background var(--transition-slow);
}

.input-bar-inner {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chat-textarea {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius);
  padding: 10px 14px;
  color: var(--fg);
  font-family: var(--font-family);
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  min-height: 44px;
  max-height: 140px;
  outline: none;
  transition: border-color var(--transition), background var(--transition-slow);
  overflow-y: auto;
}

.chat-textarea::placeholder { color: var(--muted); }

.chat-textarea:focus {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--input-border));
}

/* Action buttons in input bar */
.input-action-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.input-action-btn:hover {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.input-action-btn svg { width: 16px; height: 16px; }

/* Send button */
.send-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-sm);
  border: none;
  background: var(--send-btn);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition);
  flex-shrink: 0;
}

.send-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.send-btn:active { transform: scale(0.97); }
.send-btn svg { width: 18px; height: 18px; }

/* ── Scrollbars ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--accent) 50%, var(--scrollbar));
}

/* ── Mobile: collapse sidebar ── */
@media (max-width: 768px) {
  .savannah-app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "chat"
      "inputbar";
  }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 260px;
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
    z-index: 100;
    box-shadow: 4px 0 24px rgba(0,0,0,0.4);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--overlay);
    z-index: 99;
  }
  .sidebar.open ~ .sidebar-overlay { display: block; }
}