:root {
  color-scheme: dark;
  --bg: #071019;
  --bg-soft: #0f172a;
  --panel: rgba(15, 23, 42, 0.92);
  --panel-strong: rgba(15, 23, 42, 0.98);
  --border: rgba(148, 163, 184, 0.2);
  --text: #e5eef8;
  --muted: #93a4b8;
  --accent: #57d0c7;
  --accent-strong: #8bf1db;
  --danger: #fb7185;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(87, 208, 199, 0.18), transparent 28%),
    radial-gradient(circle at bottom right, rgba(59, 130, 246, 0.18), transparent 24%),
    var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 0;
  border-radius: 16px;
  padding: 0.9rem 1.15rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #022b2a;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.04);
}

input,
select,
textarea {
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.8);
  color: var(--text);
  padding: 0.9rem 1rem;
}

textarea {
  resize: vertical;
}

label span,
.panel-note,
.eyebrow,
.status-chip,
.section-head p {
  color: var(--muted);
}

.app-shell {
  display: grid;
  grid-template-columns: 340px 1fr;
  min-height: 100vh;
}

.sidebar,
.content {
  padding: 1.5rem;
}

.sidebar {
  display: grid;
  gap: 1rem;
  background: rgba(7, 16, 25, 0.7);
  backdrop-filter: blur(14px);
  border-right: 1px solid var(--border);
}

.brand-card,
.panel-block,
.list-card,
.thread-card,
.feature-card,
.tab-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.brand-card,
.panel-block,
.list-card,
.thread-card,
.feature-card,
.tab-panel {
  padding: 1.1rem;
}

.brand-card {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.brand-card h1,
.panel-header h2,
.feature-card h3,
.section-head h3 {
  margin: 0;
}

.eyebrow {
  margin: 0 0 0.2rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
}

.status-chip {
  margin: 0;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(87, 208, 199, 0.22);
  background: rgba(87, 208, 199, 0.08);
}

.nav-tabs {
  display: grid;
  gap: 0.5rem;
}

.nav-button {
  width: 100%;
  justify-self: stretch;
  text-align: left;
  background: rgba(15, 23, 42, 0.85);
  color: var(--text);
  border: 1px solid transparent;
}

.nav-button.is-active {
  border-color: rgba(87, 208, 199, 0.32);
  color: var(--accent-strong);
}

.stack-form,
.settings-grid,
.button-row,
.message-composer {
  display: grid;
  gap: 0.85rem;
}

.compact-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.content {
  display: grid;
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.panel-header,
.section-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.chat-layout,
.feature-grid {
  display: grid;
  gap: 1rem;
}

.chat-layout {
  grid-template-columns: minmax(260px, 320px) minmax(380px, 1fr) minmax(260px, 320px);
  margin-top: 1rem;
}

.feature-grid,
.settings-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 1rem;
}

.conversation-list,
.message-thread,
.simple-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.conversation-list,
.directory-list,
.simple-list {
  display: grid;
  gap: 0.75rem;
}

.conversation-item,
.directory-item,
.simple-item {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 0.9rem 1rem;
  background: rgba(15, 23, 42, 0.65);
}

.conversation-item {
  cursor: pointer;
}

.conversation-item.is-selected {
  border-color: rgba(87, 208, 199, 0.42);
  background: rgba(87, 208, 199, 0.08);
}

.conversation-item h4,
.conversation-item p,
.message p,
.directory-item p,
.simple-item p {
  margin: 0;
}

.message-thread {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
  min-height: 320px;
  max-height: 54vh;
  overflow: auto;
  padding-right: 0.35rem;
}

.message {
  max-width: 78%;
  padding: 0.9rem 1rem;
  border-radius: 18px;
  border: 1px solid var(--border);
}

.message-author {
  color: var(--accent-strong);
  font-size: 0.82rem;
  margin-bottom: 0.25rem;
}

.message-incoming {
  background: rgba(15, 23, 42, 0.7);
}

.message-outgoing {
  margin-left: auto;
  background: rgba(87, 208, 199, 0.12);
}

.switch-field {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.switch-field input {
  width: 24px;
  height: 24px;
}

.directory-item label {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.directory-item input[type='checkbox'] {
  width: 20px;
  height: 20px;
  margin-top: 0.15rem;
}

.top-gap {
  margin-top: 1rem;
}

.hidden {
  display: none;
}

@media (max-width: 1300px) {
  .chat-layout {
    grid-template-columns: minmax(260px, 320px) 1fr;
  }
}

@media (max-width: 1024px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .chat-layout,
  .feature-grid,
  .settings-grid,
  .compact-grid {
    grid-template-columns: 1fr;
  }
}
.attachment-list,
.message-attachments {
  display: grid;
  gap: 0.6rem;
}

.attachment-chip {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.8rem 0.9rem;
  background: rgba(15, 23, 42, 0.72);
}

.attachment-chip p,
.attachment-chip strong {
  display: block;
}

.compact-attachment {
  padding: 0.7rem 0.8rem;
}