:root {
  color-scheme: light;
  --bg: #eef2ff;
  --bg-accent: #e0e7ff;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-strong: #ffffff;
  --panel-soft: #f8faff;
  --line: #d8def0;
  --line-strong: #c7d2fe;
  --text: #162033;
  --muted: #667085;
  --primary: #4f46e5;
  --primary-strong: #3730a3;
  --primary-soft: #eef2ff;
  --success-soft: #ecfdf5;
  --warning-soft: #fff7ed;
  --error-soft: #fef2f2;
  --shadow: 0 18px 48px rgba(31, 41, 55, 0.08);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(79, 70, 229, 0.14), transparent 28%),
    linear-gradient(180deg, #f7f9ff 0%, var(--bg) 100%);
  color: var(--text);
}

a { color: var(--primary); text-decoration: none; }
img { display: block; }
h1, h2, h3, p { margin-top: 0; }

.layout-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  min-height: 100vh;
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  color: #f8fafc;
  background:
    linear-gradient(180deg, rgba(10, 15, 31, 0.98), rgba(22, 28, 45, 0.96)),
    radial-gradient(circle at top, rgba(99, 102, 241, 0.35), transparent 40%);
  border-right: 1px solid rgba(255,255,255,0.08);
}

.sidebar h1 { margin: 0 0 8px; font-size: 26px; letter-spacing: -0.02em; }
.sidebar .muted { color: rgba(226, 232, 240, 0.72); }
.sidebar-footer { margin-top: auto; font-size: 13px; }
.nav { display: grid; gap: 10px; }
.nav-link {
  padding: 13px 14px;
  border-radius: 14px;
  color: #dbe3f1;
  border: 1px solid transparent;
  background: rgba(255,255,255,0.02);
}
.nav-link.active,
.nav-link:hover {
  color: #fff;
  background: rgba(99, 102, 241, 0.22);
  border-color: rgba(199, 210, 254, 0.18);
}

.main-content {
  padding: 28px;
  display: grid;
  gap: 22px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.im-page-header h2,
.hero-card h2 { font-size: 32px; letter-spacing: -0.03em; margin-bottom: 10px; }
.hero-card,
.panel {
  background: var(--panel);
  border: 1px solid rgba(216, 222, 240, 0.9);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}
.inset-panel {
  background: linear-gradient(180deg, #ffffff, #f7f9ff);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), var(--shadow);
}
.muted { color: var(--muted); }
.eyebrow,
.section-kicker,
.task-pill,
.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
}
.eyebrow,
.section-kicker {
  margin-bottom: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  text-transform: uppercase;
}

.hero-home {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 22px;
  align-items: stretch;
}
.hero-copy p { max-width: 680px; line-height: 1.7; }
.cta-row, .form-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  border: none;
  border-radius: 14px;
  padding: 11px 18px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 14px 30px rgba(79, 70, 229, 0.25);
}
.button.secondary {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--line-strong);
  box-shadow: none;
}
.preview-header,
.stream-toolbar,
.info-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.stats-strip,
.stats-card {
  display: grid;
  grid-template-columns: repeat(3, minmax(96px, 1fr));
  gap: 12px;
}
.stats-card { grid-template-columns: repeat(2, minmax(110px, 1fr)); }
.stats-strip > div,
.stats-card > div {
  min-width: 96px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px 16px;
}
.stats-strip strong,
.stats-card strong {
  display: block;
  font-size: 24px;
  margin-bottom: 6px;
}
.stats-strip span,
.stats-card span,
.feed-preview-item span,
.message-meta,
.role,
.sidebar-footer { color: var(--muted); }
.feed-preview {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}
.feed-preview-item {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
}
.feed-preview-item p { margin: 6px 0 0; color: var(--muted); }
.home-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.feature-panel h3 { margin-bottom: 10px; }
.feature-panel p { line-height: 1.7; }

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.9fr) minmax(320px, 0.92fr);
  gap: 20px;
}
.im-shell { align-items: start; }
.im-main-stream,
.im-info-panel,
.chat-shell {
  padding: 18px;
  background: rgba(255,255,255,0.88);
}
.messages-panel,
.chat-list,
.team-panel { display: grid; gap: 14px; }
.stream-toolbar {
  padding: 8px 6px 18px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line);
}
.stream-toolbar p,
.info-panel-header p { margin: 4px 0 0; }
.status-dot {
  background: var(--primary-soft);
  color: var(--primary);
}
.status-dot.online {
  background: #ecfeff;
  color: #0f766e;
}
.message-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,250,255,0.96));
}
.message-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  margin-bottom: 10px;
}
.message-body { line-height: 1.7; }
.prewrap { white-space: pre-wrap; }
.task-pill {
  margin-bottom: 12px;
  background: var(--warning-soft);
  color: #9a3412;
}
.task-pill.ghost {
  background: #f3f4f6;
  color: #6b7280;
}
.group-message {
  position: relative;
  overflow: hidden;
}
.group-message::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 4px;
  border-radius: 999px;
  background: #d1d5db;
}
.group-message.task::before { background: var(--primary); }
.group-message.summary {
  background: linear-gradient(180deg, #f0fdf4, #ecfdf5);
}
.group-message.summary::before { background: #10b981; }
.group-message.system::before { background: #94a3b8; }

.team-panel { align-content: start; }
.member-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 14px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  background: var(--panel-strong);
}
.avatar {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  object-fit: cover;
  background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
}
.avatar-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-strong);
  font-weight: 800;
}
.role {
  font-weight: 700;
  margin: 4px 0 8px;
}

.chat-panel { display: grid; gap: 18px; }
.dm-toolbar { padding: 2px 2px 16px; }
.dm-identity {
  display: flex;
  align-items: center;
  gap: 12px;
}
.chat-list {
  max-width: 920px;
}
.chat-message {
  max-width: 78%;
  display: grid;
  gap: 8px;
}
.chat-message.user {
  margin-left: auto;
  background: linear-gradient(180deg, #eef4ff, #e0ebff);
  border-color: #c7d2fe;
}
.chat-message.assistant {
  margin-right: auto;
  background: linear-gradient(180deg, #ffffff, #f8fafc);
}
.chat-message .message-meta strong { color: var(--text); }
.chat-form {
  display: grid;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}
.composer-box {
  display: block;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
  padding: 4px;
}
.chat-form textarea {
  width: 100%;
  border: none;
  background: transparent;
  border-radius: 14px;
  padding: 14px;
  font: inherit;
  resize: vertical;
  min-height: 120px;
  color: var(--text);
}
.chat-form textarea:focus { outline: none; }
.composer-actions { justify-content: space-between; }
.file-trigger {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: var(--primary-soft);
  color: var(--primary);
  cursor: pointer;
  font-weight: 600;
}
.file-trigger input[type="file"] {
  width: 0.1px;
  height: 0.1px;
  opacity: 0;
  overflow: hidden;
  position: absolute;
}
.attachment-box {
  margin-top: 2px;
  padding: 12px 14px;
  border-radius: 14px;
  background: var(--primary-soft);
  border: 1px solid #c7d2fe;
}
.error-card {
  background: var(--error-soft);
  color: #991b1b;
}

@media (max-width: 1180px) {
  .hero-home,
  .home-grid,
  .split-grid { grid-template-columns: 1fr; }
  .chat-message { max-width: 92%; }
}

@media (max-width: 900px) {
  .layout-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .main-content { padding: 18px; }
  .page-header { flex-direction: column; }
  .stats-strip,
  .stats-card { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stream-toolbar,
  .preview-header,
  .info-panel-header,
  .composer-actions { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .hero-card,
  .panel { padding: 18px; border-radius: 20px; }
  .im-page-header h2,
  .hero-card h2 { font-size: 26px; }
  .stats-strip,
  .stats-card { grid-template-columns: 1fr; }
  .chat-message { max-width: 100%; }
}