/* ==================================================================
   METTA FRAME SHELL — CSS Grid coordinator
   Decoupled panels: navbar (top), sidebar (left), main content (right)
   ================================================================== */

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: #0a0a12;
  color: #f0f0f0;
}

/* ===== Shell grid ===== */
.app-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: 56px 1fr;
  grid-template-areas:
    "navbar navbar"
    "sidebar main";
  height: 100vh;
  height: 100dvh;
  width: 100vw;
  overflow: hidden;
}

.frame-navbar { grid-area: navbar; }
.frame-sidebar { grid-area: sidebar; }
.frame-main { grid-area: main; }

/* ===== iframe panels ===== */
.frame-navbar iframe,
.frame-sidebar iframe,
.frame-main iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  background: #0a0a12;
}

.frame-sidebar {
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.frame-main {
  overflow: hidden;
  background: #0a0a12;
}

/* ===== Mobile responsive ===== */
@media (max-width: 768px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "navbar"
      "sidebar"
      "main";
  }
  .frame-navbar iframe {
    height: 110px; /* navbar stacks brand+links on mobile; give it room */
  }
  .frame-sidebar {
    display: block;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    max-height: 40vh;
    overflow-y: auto;
  }
  .frame-sidebar iframe {
    height: 40vh;
    min-height: 200px;
  }
}

/* ===== Collapse / expand toggle ===== */
.frame-collapse-btn {
  position: fixed;
  z-index: 9999;
  bottom: 16px;
  right: 16px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: #0f766e;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
}
.frame-collapse-btn:hover { background: #115e59; }
.frame-collapse-btn.collapsed .ico-collapse { display: none; }
.frame-collapse-btn.collapsed .ico-expand { display: inline; }
.frame-collapse-btn .ico-expand { display: none; }

/* collapsed state: only main content fills the screen */
.app-shell.collapsed .frame-navbar,
.app-shell.collapsed .frame-sidebar {
  display: none !important;
}
.app-shell.collapsed {
  grid-template-rows: 1fr;
  grid-template-columns: 1fr;
  grid-template-areas: "main";
}
.app-shell.collapsed .frame-main {
  grid-area: main;
}

/* ===== Safari / iOS fixes ===== */
@supports (-webkit-appearance: none) {
  .app-shell { -webkit-print-color-adjust: exact; color-adjust: exact; }
}

iframe {
  -webkit-overflow-scrolling: touch;
}

.frame-main iframe {
  overscroll-behavior: contain;
}