:root {
  --bg: #0b1220;
  --bg-elev: #121a2b;
  --bg-soft: #182235;
  --border: rgba(148, 163, 184, 0.16);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;
  --sidebar-w: 268px;
  --radius: 14px;
  --font: "DM Sans", system-ui, sans-serif;
  --display: "Instrument Serif", Georgia, serif;
  --shadow: 0 18px 40px rgba(2, 8, 23, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(56, 189, 248, 0.12), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(52, 211, 153, 0.08), transparent 55%),
    linear-gradient(160deg, #070b14, #0b1220 40%, #0f172a);
}

#app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
  transition: grid-template-columns .25s ease;
}
#app.collapsed { --sidebar-w: 84px; }
#app.collapsed .brand-text,
#app.collapsed .nav-label,
#app.collapsed .sidebar-footer .btn,
#app.collapsed .user-chip span { display: none; }

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 1rem 0.85rem;
  background: rgba(15, 23, 42, 0.72);
  border-right: 1px solid var(--border);
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  z-index: 20;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.35rem 0.4rem;
}
.brand-mark {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: grid; place-items: center;
  font-weight: 700;
  background: linear-gradient(135deg, #0ea5e9, #10b981);
  color: #041018;
  flex-shrink: 0;
}
.brand-mark.lg { width: 56px; height: 56px; font-size: 1.4rem; border-radius: 16px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; flex: 1; min-width: 0; }
.brand-text strong { letter-spacing: 0.04em; }
.brand-text span { color: var(--muted); font-size: 0.8rem; }

.nav-menu { display: flex; flex-direction: column; gap: 0.25rem; overflow: auto; flex: 1; }
.nav-item, .nav-section {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.7rem 0.8rem;
  border-radius: 12px;
  color: var(--muted);
  text-decoration: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  font: inherit;
  text-align: left;
  width: 100%;
  transition: background .2s, color .2s, transform .2s;
}
.nav-item:hover, .nav-section:hover { background: rgba(148,163,184,0.08); color: var(--text); }
.nav-item.active { background: rgba(56,189,248,0.12); color: #e0f2fe; }
.nav-icon { width: 1.25rem; text-align: center; flex-shrink: 0; }
.nav-section { margin-top: 0.6rem; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; opacity: 0.7; cursor: default; }
.nav-section:hover { background: transparent; }
.nav-item.nested {
  padding-left: 1.55rem;
  padding-top: 0.45rem;
  padding-bottom: 0.45rem;
  font-size: 0.92rem;
  opacity: 0.92;
}
.nav-item.nested .nav-icon { opacity: 0.55; }
.nav-meta {
  padding: 0.15rem 0.8rem 0.55rem;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.3;
}

.sidebar-footer { border-top: 1px solid var(--border); padding-top: 0.8rem; display: grid; gap: 0.5rem; }
.user-chip { font-size: 0.82rem; color: var(--muted); padding: 0 0.4rem; }
.user-chip strong { color: var(--text); display: block; }

.main-wrap { min-width: 0; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 0.8rem;
  padding: 1.1rem 1.4rem 0.4rem;
  position: sticky; top: 0; z-index: 10;
  background: linear-gradient(180deg, rgba(11,18,32,0.92), rgba(11,18,32,0.55), transparent);
  backdrop-filter: blur(8px);
}
.topbar h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.5rem, 2vw, 2rem);
  margin: 0;
  flex: 1;
}
.content { padding: 0.6rem 1.4rem 2.2rem; animation: fadeUp .35s ease; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.login-screen {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center;
  background:
    radial-gradient(800px 400px at 20% 10%, rgba(56,189,248,0.18), transparent),
    radial-gradient(700px 400px at 80% 90%, rgba(52,211,153,0.12), transparent),
    #070b14;
  padding: 1.5rem;
}
.login-panel {
  width: min(440px, 100%);
  background: rgba(18,26,43,0.88);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 2rem;
  box-shadow: var(--shadow);
  animation: fadeUp .45s ease;
}
.login-brand h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 2.2rem;
  margin: 1rem 0 0.35rem;
}
.login-brand em { font-style: italic; color: #7dd3fc; }
.login-brand p, .login-hint { color: var(--muted); }
.google-wrap { margin: 1.4rem 0 0.8rem; min-height: 44px; }
.error-text { color: var(--danger); }
.login-panel.block { text-align: center; }

.hidden { display: none !important; }
.mobile-only { display: none; }

@media (max-width: 900px) {
  #app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; left: 0; top: 0;
    transform: translateX(-105%);
    transition: transform .25s ease;
    width: min(300px, 88vw);
  }
  #app.drawer-open .sidebar { transform: none; }
  .mobile-only { display: inline-grid; }
  .content, .topbar { padding-left: 1rem; padding-right: 1rem; }
}