/* ============================================================
   layout.css — Page Layout, Grid Systems, Responsive Breakpoints
   ============================================================ */

.page-wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 28px 80px;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 22px;
  align-items: start;
}

.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ── SITE SHELL — full-page two-column layout: main content + right panel ── */
.site-shell {
  display: grid;
  grid-template-columns: 1fr 320px;
  min-height: calc(100vh - var(--nav-h));
  align-items: start;
}

.site-main {
  min-width: 0;
  padding: 28px 28px 80px;
}

/* Sidebar — sticky, full viewport height, flex column so messenger sticks to bottom */
.site-panel {
  position: sticky;
  top: var(--nav-h);
  height: calc(100vh - var(--nav-h));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-left: 1px solid var(--border);
}

/* The scrollable content area fills all space above messenger */
.site-panel > div:first-child {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}

/* ── RESPONSIVE BREAKPOINTS ─────────────────────────────────────────────── */

/* ── Tablet: 821–1100px ─────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .page-wrap  { padding: 24px 20px 80px; }
  .site-shell { grid-template-columns: 1fr 280px; }
}

/* ── Tablet: ≤1024px ────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .two-col   { grid-template-columns: 1fr; }
  .three-col { grid-template-columns: repeat(2, 1fr); }
  .pipeline  { grid-template-columns: repeat(2, 1fr); }
  .nav-links { gap: 2px; }
  .nav-back  { display: none; }
}

/* ── Large tablet / small laptop: ≤900px ───────────────────────────────── */
@media (max-width: 900px) {
  .site-shell { grid-template-columns: 1fr; }
  .site-panel { display: none; }
  .site-main  { padding: 20px 18px 80px; max-width: 100%; }
  .case-hero-wrap { padding: 0 16px; }
  .case-tabs  { margin-top: 16px; }
  .case-tab   { padding: 8px 11px; font-size: 11px; }
}

/* ── Two-col sidebar breakpoint ─────────────────────────────────────────── */
@media (max-width: 820px) {
  .two-col { grid-template-columns: 1fr; }
}

/* ── Mobile: ≤640px ─────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .three-col  { grid-template-columns: 1fr; }
  .pipeline   { grid-template-columns: 1fr; }
  .page-wrap  { padding: 16px 12px 80px; }
  .auth-box   { padding: 24px 16px; }
  .site-main  { padding: 14px 12px 80px; }
  .case-hero-stats { flex-direction: column; gap: 8px; }
  .card       { border-radius: 10px; }
  .nav-brand  { font-size: 12px !important; }
  .nav-links .nav-link { display: none; }
  .nav-links .avatar,
  .nav-links a[onclick*="handleLogout"] { display: flex; }
  #navTru     { font-size: 11px !important; }
  .welcome-bar { flex-direction: column; align-items: flex-start; gap: 8px; }
  .welcome-stats { flex-wrap: wrap; gap: 8px; }
}

/* ── Small mobile: ≤400px ───────────────────────────────────────────────── */
@media (max-width: 400px) {
  .page-wrap  { padding: 12px 10px 80px; }
  .modal-box  { padding: 20px 14px; }
  .case-tab   { padding: 7px 8px; font-size: 10px; }
}

/* ── PANEL TOGGLE (shown only when panel is hidden at mid-width) ─────────── */
@media (min-width: 901px) {
  .panel-toggle-btn { display: none; }
}
@media (max-width: 900px) {
  .panel-toggle-btn {
    display: flex; align-items: center; gap: 6px;
    position: fixed; bottom: 20px; right: 20px; z-index: 200;
    background: var(--primary); color: white;
    border: none; border-radius: 50px;
    padding: 10px 16px; font-size: 12px; font-weight: 700;
    cursor: pointer; box-shadow: 0 4px 16px rgba(0,0,0,0.3);
    outline: none;
  }
  .site-panel.panel-open {
    display: flex !important;
    position: fixed; top: var(--nav-h); right: 0; bottom: 0;
    z-index: 300; width: 300px;
    box-shadow: -8px 0 32px rgba(0,0,0,0.4);
    overflow-y: auto;
  }
}