* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; overscroll-behavior: none; }
body { background: var(--bg); color: var(--text); font-family: var(--font); font-size: 14px; -webkit-font-smoothing: antialiased; }
.font-brand { font-family: var(--font-brand); }

/* Layout — Fixed topbar + fixed sidebar + scrollable main */
.app { display: grid; grid-template-columns: var(--sidebar-w) 1fr; grid-template-rows: var(--topbar-h) 1fr; min-height: 100vh; }
.topbar { grid-column: 1/-1; background: var(--bg2); border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: var(--safe-top) calc(20px + var(--safe-right)) 0 calc(20px + var(--safe-left)); gap: 14px; z-index: 200; position: fixed; top: 0; left: 0; right: 0; height: var(--topbar-h); }
/* Three rows: identity card, nav (the only scroller — min-height:0 lets it
   shrink), footer. The sidebar itself never scrolls. */
.sidebar { position: fixed; top: var(--topbar-h); left: 0; bottom: 0; width: var(--sidebar-w); background: var(--bg2); border-right: 1px solid var(--border); padding: 12px 12px 10px; display: flex; flex-direction: column; overflow: hidden; z-index: 30; }
.sb-scroll { flex: 1; min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 4px; margin: 0 -6px; padding: 0 6px 8px; }
.main { --pad-x: 28px; --pad-y: 24px; grid-column: 2; margin-top: var(--topbar-h); overflow-y: auto; overscroll-behavior-y: contain; height: calc(100vh - var(--topbar-h)); padding: var(--pad-y) var(--pad-x) 60px; scroll-behavior: smooth; }

/* Brand */
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; letter-spacing: -0.3px; min-width: 0; }
.brand-icon { flex-shrink: 0; filter: drop-shadow(0 0 8px rgba(255,174,0,0.3)); }
.app-footer { position: fixed; bottom: 0; left: var(--sidebar-w); right: 0; display: flex; align-items: center; justify-content: center; gap: 10px; padding: 8px calc(20px + var(--safe-right)) calc(8px + var(--safe-bottom)) calc(20px + var(--safe-left)); background: var(--bg2); border-top: 1px solid var(--border); z-index: 5; }
.app-footer svg { opacity: 0.7; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.menu-toggle { display: none; background: var(--bg3); border: 1px solid var(--border); border-radius: 7px; width: 34px; height: 34px; align-items: center; justify-content: center; cursor: pointer; color: var(--text2); }

/* Topbar back arrow — hidden via the [hidden] attribute until there is somewhere to go. */
.topbar-back { display: flex; align-items: center; justify-content: center; flex-shrink: 0; background: var(--bg3); border: 1px solid var(--border); border-radius: 7px; width: 34px; height: 34px; cursor: pointer; color: var(--text2); font-size: 17px; padding: 0; transition: background .15s, color .15s; }
.topbar-back[hidden] { display: none; }
.topbar-back:hover { background: var(--bg4); color: var(--text); }
.brand { cursor: pointer; user-select: none; border-radius: 8px; padding: 4px 6px; margin-left: -6px; transition: background .15s; }
.brand:hover { background: rgba(255,255,255,0.05); }
.brand:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Pull-to-refresh indicator */
.ptr { position: fixed; top: calc(var(--topbar-h) + 6px); left: 50%; transform: translate(-50%, 0); z-index: 190; width: 34px; height: 34px; border-radius: 50%; background: var(--bg2); border: 1px solid var(--border); box-shadow: 0 4px 14px rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center; color: var(--text3); font-size: 17px; opacity: 0; visibility: hidden; pointer-events: none; }
.ptr.visible { visibility: visible; }
.ptr.ready { color: var(--accent); border-color: rgba(79,124,255,0.4); }
.ptr.spinning { transition: transform .2s ease; }
.ptr.spinning i { animation: spin .7s linear infinite; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* Pages */
.page { display: none; }
.page.active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .4s ease, transform .4s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* Page-specific layouts */
.report-layout, .help-layout { display: grid; }

/* Responsive — Tablet (920px) */
@media (max-width: 920px) {
  .report-layout { grid-template-columns: 1fr !important; }
  .help-layout { grid-template-columns: 1fr !important; }
  .app { grid-template-columns: 1fr; grid-template-rows: var(--topbar-h) 1fr; }
  .sidebar { transform: translateX(-100%); transition: transform .25s; }
  .sidebar.open { transform: translateX(0); box-shadow: 0 0 40px rgba(0,0,0,0.6); }
  .main { --pad-x: 16px; --pad-y: 16px; grid-column: 1; margin-top: var(--topbar-h); padding: var(--pad-y) var(--pad-x) 60px; }
  .menu-toggle { display: flex; }
  /* Component-level overrides for this breakpoint live in components.css,
     which loads last — same-specificity rules here would be overridden. */
  .section-header { flex-direction: column; }
  .brand span { display: none; }
  .app-footer { left: 0; }
}

/* Responsive — Mobile (520px) */
@media (max-width: 520px) {
  .topbar { padding: var(--safe-top) calc(12px + var(--safe-right)) 0 calc(12px + var(--safe-left)); gap: 8px; }
  .topbar-search { display: none !important; }
  .main { --pad-x: 14px; --pad-y: 18px; padding: var(--pad-y) var(--pad-x) 60px; }
  /* Component-level overrides for this breakpoint live in components.css. */
  :root { --footer-h: calc(23px + var(--safe-bottom)); }
  .app-footer { padding: 5px 12px calc(5px + var(--safe-bottom)); }
  .app-footer svg { width: 112px; height: 12px; }
}
.sidebar-backdrop { display: none; position: fixed; inset: var(--topbar-h) 0 0 0; background: rgba(0,0,0,0.5); z-index: 25; }
.sidebar-backdrop.show { display: block; }