/* HiperChat — Sovereign Design System */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Dark Theme Palette (Default) */
  --bg-primary: hsl(220, 18%, 10%);
  --bg-secondary: hsl(220, 16%, 14%);
  --bg-tertiary: hsl(220, 14%, 18%);
  --bg-hover: hsl(220, 14%, 22%);
  --bg-active: hsl(220, 16%, 26%);

  --border-subtle: hsl(220, 12%, 20%);
  --border-strong: hsl(220, 12%, 28%);

  --text-primary: hsl(210, 20%, 96%);
  --text-secondary: hsl(215, 15%, 72%);
  --text-muted: hsl(215, 12%, 48%);

  --accent-cyan: hsl(186, 85%, 48%);
  --accent-emerald: hsl(152, 70%, 45%);
  --accent-amber: hsl(38, 92%, 50%);
  --accent-rose: hsl(350, 80%, 55%);
  --accent-blue: hsl(210, 90%, 56%);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
}

body.light-theme {
  --bg-primary: hsl(210, 20%, 98%);
  --bg-secondary: hsl(210, 16%, 94%);
  --bg-tertiary: hsl(210, 14%, 88%);
  --bg-hover: hsl(210, 14%, 84%);
  --bg-active: hsl(210, 16%, 80%);

  --border-subtle: hsl(215, 16%, 86%);
  --border-strong: hsl(215, 16%, 74%);

  --text-primary: hsl(220, 24%, 12%);
  --text-secondary: hsl(218, 14%, 36%);
  --text-muted: hsl(215, 12%, 56%);

  --accent-cyan: hsl(186, 90%, 38%);
  --accent-emerald: hsl(152, 75%, 35%);
  --accent-amber: hsl(38, 92%, 45%);
  --accent-rose: hsl(350, 85%, 48%);
  --accent-blue: hsl(210, 90%, 48%);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

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

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Top Navigation */
.top-nav {
  height: 52px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 10;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-name {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.2px;
}

.brand-badge {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  color: var(--accent-cyan);
  font-weight: 600;
  border: 1px solid var(--border-subtle);
}

.header-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.active-target-title {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
}

.active-target-topic {
  font-size: 11px;
  color: var(--text-muted);
  max-width: 420px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.connection-status-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
}

.status-dot.disconnected {
  background-color: var(--accent-rose);
}

.btn-icon {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.mobile-only {
  display: none;
}

/* App Layout Grid */
.app-layout {
  display: grid;
  grid-template-columns: 240px 1fr 200px;
  height: calc(100vh - 52px);
  width: 100vw;
  overflow: hidden;
  position: relative;
}

.app-layout.drag-over::after {
  content: "📂 Drop Photos or Files to Upload & Inspect";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 229, 255, 0.15);
  border: 2px dashed var(--accent-cyan);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-cyan);
  z-index: 50;
  pointer-events: none;
}

/* Left Sidebar */
.sidebar {
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.user-card {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-tertiary);
}

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-nick-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.user-nick {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-tag {
  font-size: 9px;
  font-weight: 600;
  background: var(--bg-primary);
  color: var(--accent-cyan);
  padding: 1px 4px;
  border-radius: 3px;
}

.user-host {
  font-size: 10px;
  color: var(--text-muted);
}

.btn-small-icon {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
}

.btn-small-icon:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-section {
  padding: 12px 8px 4px 8px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
  margin-bottom: 4px;
}

.section-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.6px;
  color: var(--text-muted);
}

.btn-text-action {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  padding: 0 4px;
}

.btn-text-action:hover {
  color: var(--text-primary);
}

.channel-list {
  list-style: none;
}

.channel-item {
  display: flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  margin-bottom: 2px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.12s ease;
  user-select: none;
}

.channel-item:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.channel-item.active {
  background-color: var(--bg-active);
  color: var(--text-primary);
  font-weight: 600;
}

.item-icon {
  width: 18px;
  color: var(--text-muted);
  font-weight: 600;
}

.item-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.unread-pill {
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--accent-cyan);
  color: #000;
}

.unread-pill.hidden {
  display: none;
}

.sidebar-footer {
  margin-top: auto;
  padding: 12px 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 11px;
  color: var(--text-muted);
}

/* Chat Main Area */
.chat-main {
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 0;
  position: relative;
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Message Rows */
.msg-row {
  display: flex;
  gap: 12px;
  line-height: 1.45;
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: translateY(0); }
}

.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--border-subtle);
}

.msg-content-wrap {
  flex: 1;
  min-width: 0;
}

.msg-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 2px;
}

.msg-sender {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
}

.msg-sender.bot {
  color: var(--accent-cyan);
}

.msg-badge {
  font-size: 9px;
  padding: 1px 4px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  font-weight: 600;
  text-transform: uppercase;
}

.msg-time {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.msg-text {
  color: var(--text-secondary);
  font-size: 13.5px;
  word-break: break-word;
}

.msg-text pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  margin: 6px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  overflow-x: auto;
  color: var(--text-primary);
}

.msg-text code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-secondary);
  padding: 2px 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* Images and File Attachment Cards */
.chat-img-preview {
  max-width: 380px;
  max-height: 280px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  margin-top: 6px;
  display: block;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.chat-img-preview:hover {
  transform: scale(1.01);
}

.file-attachment-card {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  margin-top: 6px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.15s ease;
}

.file-attachment-card:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-cyan);
}

.file-card-icon {
  font-size: 20px;
}

.file-card-info {
  display: flex;
  flex-direction: column;
}

.file-card-name {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
}

.file-card-meta {
  font-size: 11px;
  color: var(--text-muted);
}

/* System Message Row */
.msg-system {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.msg-system .sys-icon {
  color: var(--accent-cyan);
}

/* Chat Meta Bar & Hint */
.chat-meta-bar {
  padding: 4px 20px;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-primary);
}

.chat-meta-bar code {
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  padding: 1px 4px;
  border-radius: 3px;
  border: 1px solid var(--border-subtle);
}

/* Input Form */
.chat-input-wrapper {
  padding: 10px 20px 16px 20px;
  background: var(--bg-primary);
}

.chat-form {
  display: flex;
  align-items: center;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 4px 6px 4px 10px;
  gap: 8px;
  transition: border-color 0.15s ease;
}

.chat-form:focus-within {
  border-color: var(--accent-cyan);
}

.btn-attach {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease;
}

.btn-attach:hover {
  color: var(--accent-cyan);
}

.chat-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 14px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  padding: 6px 0;
}

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

.btn-send {
  background: var(--accent-cyan);
  color: #000;
  border: none;
  border-radius: var(--radius-md);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s ease;
}

.btn-send:hover {
  opacity: 0.9;
  transform: scale(1.03);
}

/* Right Sidebar: Active Members */
.users-sidebar {
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  overflow-y: auto;
  padding: 12px;
}

.users-header {
  padding: 4px 6px 8px 6px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 8px;
}

.users-list {
  list-style: none;
}

.user-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: var(--radius-md);
  margin-bottom: 2px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 13px;
}

.user-item:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.user-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
}

.user-item-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.op-star {
  color: var(--accent-amber);
  font-size: 11px;
}

/* Integration Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-overlay.hidden {
  display: none;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 640px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 22px;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 20px;
}

.modal-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.code-block-header {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 12px;
  margin-bottom: 4px;
}

.code-block {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  overflow-x: auto;
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 220px 1fr;
  }
  .users-sidebar {
    display: none;
  }
}

@media (max-width: 640px) {
  .app-layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: absolute;
    top: 52px;
    left: 0;
    bottom: 0;
    width: 260px;
    z-index: 20;
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .mobile-only {
    display: flex;
  }
}