:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-muted: #f3f5f9;
  --text: #0f172a;
  --text-muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2a53ff;
  --brand-2: #8e4bff;
  --hover: #eef2ff;
  --shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
}

body[data-theme="dark"] {
  --bg: #090d15;
  --panel: #111827;
  --panel-muted: #0f172a;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
  --line: #1f2937;
  --brand: #4f8cff;
  --brand-2: #8b5cf6;
  --hover: #172036;
  --shadow: 0 18px 34px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

html,
body,
#root {
  height: 100%;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.k-shell {
  height: 100%;
  display: grid;
  grid-template-rows: 64px 1fr;
}

.k-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(8px);
}

.k-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.k-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.k-logo {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.k-brand-name {
  font-weight: 700;
  white-space: nowrap;
}

.k-search {
  width: min(520px, 60vw);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  color: var(--text);
  background: var(--panel-muted);
}

.k-header-right {
  position: relative;
}

.k-profile-btn,
.k-collapse-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 12px;
  cursor: pointer;
}

.k-collapse-btn {
  width: 36px;
  height: 36px;
  font-size: 16px;
  line-height: 1;
}

.k-profile-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px 6px 6px;
}

.k-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  background: linear-gradient(140deg, var(--brand), var(--brand-2));
}

.k-layout {
  min-height: 0;
  display: grid;
  grid-template-columns: var(--sidebar-w, 250px) 1fr;
}

.k-sidebar {
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 12px 10px;
  overflow: auto;
}

.k-sidebar.collapsed {
  --sidebar-w: 76px;
}

.k-group-title {
  margin: 14px 8px 8px;
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.k-nav-btn {
  width: 100%;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  cursor: pointer;
  text-align: left;
  margin-bottom: 3px;
}

.k-nav-btn:hover {
  background: var(--hover);
}

.k-nav-btn.active {
  background: color-mix(in srgb, var(--brand) 14%, transparent);
  color: var(--brand);
}

.k-nav-icon {
  width: 20px;
  text-align: center;
  font-size: 15px;
  flex: 0 0 auto;
}

.k-sidebar.collapsed .k-group-title,
.k-sidebar.collapsed .k-nav-label {
  display: none;
}

.k-sidebar.collapsed .k-nav-btn {
  justify-content: center;
  padding: 10px 6px;
}

.k-main {
  overflow: auto;
  padding: 16px;
}

.k-hero {
  border: 1px solid var(--line);
  background: radial-gradient(circle at top left, color-mix(in srgb, var(--brand) 24%, transparent), transparent 52%), var(--panel);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.k-hero h1 {
  margin: 0;
  font-size: 1.35rem;
}

.k-hero p {
  margin: 8px 0 0;
  color: var(--text-muted);
}

.k-profile-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 240px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 10px;
}

.k-menu-email {
  color: var(--text-muted);
  font-size: 12px;
  margin: 0 0 8px;
}

.k-mode-title {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.k-mode-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.k-mode-btn {
  border: 1px solid var(--line);
  background: var(--panel-muted);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 6px;
  cursor: pointer;
  font-size: 12px;
}

.k-mode-btn.active {
  border-color: var(--brand);
  color: var(--brand);
}

@media (max-width: 860px) {
  .k-search {
    display: none;
  }

  .k-layout {
    grid-template-columns: 76px 1fr;
  }

  .k-sidebar {
    --sidebar-w: 76px;
  }

  .k-group-title,
  .k-nav-label {
    display: none;
  }

  .k-nav-btn {
    justify-content: center;
    padding: 10px 6px;
  }
}