/* ============================================================
   OPA CONNECT — Layout (Header · Sidebar · Main)
   ============================================================ */

/* ── Header ─────────────────────────────────────────────── */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px;
  box-shadow: var(--shadow-sm);
}
.header-left { display: flex; align-items: center; gap: 12px; }
.header-left img.opa-logo  { height: 42px; object-fit: contain; }
.header-left img.opa-icon  { height: 34px; object-fit: contain; }
.school-info h1 { font-size: 16px; font-weight: 700; color: var(--navy); letter-spacing: -0.3px; }
.school-info .detail { font-size: 11px; color: var(--text-muted); line-height: 1.6; }
.header-right img { height: 54px; object-fit: contain; }

.menu-toggle {
  display: none; background: none; border: none;
  cursor: pointer; padding: 6px; margin-right: 4px; border-radius: var(--radius);
}
.menu-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--navy); margin: 4px 0; border-radius: 2px;
  transition: all var(--dur-slow) var(--ease);
}
.menu-toggle:hover { background: var(--surface-alt); }

/* ── Sidebar ─────────────────────────────────────────────── */
.sidebar {
  position: fixed; top: var(--header-height); left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background: var(--navy);
  overflow-y: auto; overflow-x: hidden;
  z-index: 90;
  transition: transform var(--dur-slow) var(--ease);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }

.sidebar-logo {
  padding: 18px 18px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 4px;
}
.sidebar-logo-text { font-size: 12px; font-weight: 700; color: rgba(255,255,255,0.5); letter-spacing: 2px; text-transform: uppercase; }

.nav-section { padding: 12px 0 4px; }
.nav-label {
  font-size: 10px; font-weight: 700; letter-spacing: 1.2px;
  color: rgba(255,255,255,0.35); padding: 0 18px 6px;
  text-transform: uppercase;
}
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 18px; cursor: pointer; color: rgba(255,255,255,0.72);
  font-size: 13px; font-weight: 500;
  transition: background var(--dur-fast), color var(--dur-fast);
  border-left: 3px solid transparent;
  user-select: none;
}
.nav-item:hover { background: var(--navy-hover); color: rgba(255,255,255,0.95); }
.nav-item.active {
  background: rgba(26,115,232,0.22);
  color: #8ab4f8;
  border-left-color: #4d90fe;
  font-weight: 600;
}
.nav-item .nav-icon { font-size: 15px; width: 20px; text-align: center; flex-shrink: 0; }
.nav-item .nav-badge {
  margin-left: auto; font-size: 10px; font-weight: 700;
  background: var(--danger-text); color: white;
  padding: 1px 6px; border-radius: var(--radius-full);
  min-width: 18px; text-align: center;
}

/* ── Main content area ───────────────────────────────────── */
.main {
  margin-left: var(--sidebar-width);
  margin-top: var(--header-height);
  padding: 24px;
  min-height: calc(100vh - var(--header-height));
  transition: margin-left var(--dur-slow) var(--ease);
}

/* ── Page sections ───────────────────────────────────────── */
.page { display: none; }
.page.active { display: block; animation: pageSlideIn var(--dur-mid) var(--ease); }
@keyframes pageSlideIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  flex-wrap: wrap; gap: 12px; margin-bottom: 20px;
}
.page-header-text h2 { font-size: 20px; font-weight: 700; color: var(--navy); letter-spacing: -0.3px; }
.page-header-text p  { color: var(--text-muted); font-size: 13px; margin-top: 2px; }
.page-header-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* ── Sidebar overlay on mobile ───────────────────────────── */
.sidebar-backdrop {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 89; backdrop-filter: blur(2px);
}
.sidebar-backdrop.show { display: block; }

/* ── Mobile ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
  .main { margin-left: 0; padding: 16px; }
  .header { padding: 0 14px; }
  .school-info .detail { display: none; }
  .page-header { flex-direction: column; }
  .page-header-actions { width: 100%; }
}
@media (max-width: 480px) {
  .main { padding: 12px; }
}


body { background: linear-gradient(120deg,#eef7ff,#f7fbf2,#fff6f2); background-size: 300% 300%; animation: animatedGradient 18s ease infinite; }
@keyframes animatedGradient { 0%{background-position:0% 50%} 50%{background-position:100% 50%} 100%{background-position:0% 50%} }
.header { background: rgba(255,255,255,0.78); backdrop-filter: blur(16px); }
.header-profile { display:flex; align-items:center; gap:10px; }
.leader-photo { width:46px; height:46px; border-radius:50%; object-fit:cover; border:2px solid rgba(255,255,255,.8); box-shadow:var(--shadow-sm); }
.sidebar { background: rgba(11,31,59,.94); backdrop-filter: blur(18px); }
.sidebar-collapse { margin:10px 18px; color:#fff; border-color:rgba(255,255,255,.2); }
body.sidebar-collapsed { --sidebar-width: 76px; }
body.sidebar-collapsed .nav-label, body.sidebar-collapsed .sidebar-logo-text, body.sidebar-collapsed .nav-item { font-size:0; }
body.sidebar-collapsed .nav-icon { font-size:13px; margin:auto; }
body.sidebar-collapsed .nav-item { justify-content:center; padding:12px; }
.nav-icon { transition: transform var(--dur-fast); }
.nav-item:hover .nav-icon { transform: translateX(2px) scale(1.08); }
@media (max-width:768px){ .header-center{display:none}.header-profile .badge{display:none}.leader-photo{width:38px;height:38px} }


:root { --mouse-x: 50%; --mouse-y: 35%; }
body::before {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: -1;
  background:
    radial-gradient(circle at var(--mouse-x) var(--mouse-y), rgba(26,115,232,.22), transparent 24rem),
    radial-gradient(circle at calc(var(--mouse-x) + 14%) calc(var(--mouse-y) + 12%), rgba(30,126,52,.12), transparent 20rem),
    radial-gradient(circle at calc(var(--mouse-x) - 18%) calc(var(--mouse-y) + 22%), rgba(255,184,77,.14), transparent 18rem);
  filter: saturate(1.1); transition: background-position .18s linear;
}
@media (prefers-reduced-motion: reduce) { body, body::before { animation: none !important; transition: none !important; } }


.header-school-logo { max-height:54px; max-width:min(44vw,520px); object-fit:contain; filter: drop-shadow(0 5px 12px rgba(11,31,59,.12)); }
#appBrandWatermark { position:fixed; right:24px; bottom:18px; width:min(280px,38vw); opacity:.035; pointer-events:none; z-index:-1; }
.nav-item { position:relative; margin:2px 8px; border-radius:10px; border-left:0; overflow:hidden; }
.nav-item::after { content:''; position:absolute; inset:0; background:linear-gradient(120deg,rgba(255,255,255,.12),transparent); opacity:0; transition:opacity var(--dur-fast); }
.nav-item:hover::after,.nav-item.active::after { opacity:1; }
.nav-icon { display:inline-flex; align-items:center; justify-content:center; width:28px; height:28px; border-radius:8px; background:rgba(255,255,255,.1); border:1px solid rgba(255,255,255,.12); font-size:11px; font-weight:800; letter-spacing:0; }
.nav-item.active .nav-icon { background:rgba(138,180,248,.22); color:#d8e7ff; }
.page::before { content:''; position:fixed; inset:var(--header-height) 0 0 var(--sidebar-width); pointer-events:none; z-index:-2; background:radial-gradient(circle at var(--mouse-x) var(--mouse-y),rgba(255,255,255,.5),transparent 18rem); }
@media (max-width:768px){ #appBrandWatermark{width:70vw;right:8px}.page::before{left:0}.header-school-logo{max-width:58vw;max-height:44px} }
@media print { .sidebar,.header,#installBanner,#offlineBanner,.toast,.page-header-actions,.toolbar,.btn { display:none!important; } body{background:#fff!important;} body::before,#appBrandWatermark{display:none!important;} }


.leadership-footer {
  margin-left: var(--sidebar-width);
  padding: 22px 24px 28px;
  transition: margin-left var(--dur-slow) var(--ease);
}
.leadership-footer {
  background: linear-gradient(135deg, rgba(255,255,255,.72), rgba(232,240,254,.58));
  border-top: 1px solid rgba(11,31,59,.12);
  backdrop-filter: blur(18px);
}
.leadership-portrait-wrap {
  max-width: 1180px; margin: 0 auto 16px; border-radius: 18px; overflow: hidden;
  box-shadow: 0 22px 60px rgba(11,31,59,.18); border: 1px solid rgba(255,255,255,.62);
}
.leadership-portrait { width: 100%; aspect-ratio: 21/8; object-fit: cover; object-position: center; }
.leadership-message-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.leader-message {
  position: relative; padding: 18px 20px; border-radius: 14px;
  background: rgba(255,255,255,.72); border: 1px solid rgba(255,255,255,.72);
  box-shadow: var(--shadow-xs); overflow: hidden;
}
.leader-message::before { content:''; position:absolute; inset:0; background: radial-gradient(circle at var(--mouse-x) var(--mouse-y), rgba(26,115,232,.12), transparent 16rem); pointer-events:none; }
.leader-role { position: relative; font-size: 11px; font-weight: 800; letter-spacing: .9px; color: var(--accent); text-transform: uppercase; }
.leader-message h3 { position: relative; margin: 4px 0 8px; color: var(--navy); font-size: 18px; }
.leader-message p { position: relative; color: var(--text-muted); font-size: 13px; }
.leader-quote { color: var(--text)!important; font-weight: 650; font-size: 14px!important; margin-bottom: 8px; }
.school-motto { max-width:1180px; margin:14px auto 0; text-align:center; font-weight:800; color:var(--navy); letter-spacing:.3px; }
body.sidebar-collapsed .leadership-footer { margin-left: var(--sidebar-width); }
@media (max-width:768px){ .leadership-footer{margin-left:0;padding:16px 12px 22px}.leadership-message-grid{grid-template-columns:1fr}.leadership-portrait{aspect-ratio: 16/10}.school-motto{font-size:13px} }
@media print { .leadership-footer { display:none!important; } }

.nav-item .nav-icon { font-size:0; background-size:22px 22px; background-repeat:no-repeat; background-position:center; }
.nav-item[data-page="dashboard"] .nav-icon { background-image:url('../assets/nav-dashboard.svg'); }
.nav-item[data-page="students"] .nav-icon { background-image:url('../assets/nav-students.svg'); }
.nav-item[data-page="attendance"] .nav-icon { background-image:url('../assets/nav-attendance.svg'); }
.nav-item[data-page="classmaster"] .nav-icon { background-image:url('../assets/nav-classmaster.svg'); }
.nav-item[data-page="history"] .nav-icon { background-image:url('../assets/nav-history.svg'); }
.nav-item[data-page="gallery"] .nav-icon { background-image:url('../assets/nav-gallery.svg'); }
.nav-item[data-page="users"] .nav-icon { background-image:url('../assets/nav-users.svg'); }
.nav-item[data-page="transport"] .nav-icon { background-image:url('../assets/nav-transport.svg'); }
.nav-item[data-page="tc"] .nav-icon { background-image:url('../assets/nav-tc.svg'); }
.nav-item[data-page="complaints"] .nav-icon { background-image:url('../assets/nav-complaints.svg'); }
.nav-item[data-page="teacherleave"] .nav-icon { background-image:url('../assets/nav-teacherleave.svg'); }
.nav-item[data-page="modules"] .nav-icon { background-image:url('../assets/nav-modules.svg'); }
.nav-item[data-page="reports"] .nav-icon { background-image:url('../assets/nav-reports.svg'); }



.leadership-split { max-width:1180px; margin:0 auto 16px; display:grid; grid-template-columns:1fr 1fr; gap:14px; }
.leadership-piece { min-height:360px; border-radius:18px; overflow:hidden; position:relative; background-image:url('../assets/leadership-split-swapped.png'); background-size:200% 100%; background-repeat:no-repeat; box-shadow:0 22px 60px rgba(11,31,59,.18); border:1px solid rgba(255,255,255,.62); }
.leadership-principal { background-position:left center; }
.leadership-president { background-position:right center; }
.leadership-piece span { position:absolute; left:18px; bottom:18px; padding:7px 14px; border-radius:999px; background:rgba(255,255,255,.82); color:var(--navy); font-weight:800; box-shadow:var(--shadow-xs); }
@media (max-width:768px){ .leadership-split{grid-template-columns:1fr}.leadership-piece{min-height:280px;background-size:200% 100%;} }


.leadership-trio { max-width:1180px; margin:0 auto 16px; display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:14px; }
.leader-tile { padding:12px; border-radius:18px; background:rgba(255,255,255,.72); border:1px solid rgba(255,255,255,.72); box-shadow:var(--shadow-xs); text-align:center; }
.leader-photo-panel { min-height:270px; border-radius:14px; background-size:cover; background-repeat:no-repeat; background-position:center; box-shadow:0 16px 44px rgba(11,31,59,.16); }
.principal-panel { background-image:url('../assets/leadership-split-swapped.png'); background-size:200% 100%; background-position:left center; }
.director-panel { background-image:url('../assets/leadership-split-swapped.png'); background-size:200% 100%; background-position:right center; }
.md-panel { background-image:url('../assets/managing-director-chanchal.png'); background-position:center; }
.leader-tile h3 { color:var(--navy); font-size:15px; margin:10px 0 4px; }
.leader-tile p { color:var(--text-muted); font-size:12px; }
.footer-signature { height:44px; width:auto; margin:10px auto 0; object-fit:contain; }
.school-anthem { max-width:1180px; margin:8px auto 0; text-align:center; color:var(--text-muted); font-weight:700; }
.leadership-message-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
@media (max-width:900px){ .leadership-trio,.leadership-message-grid{grid-template-columns:1fr}.leader-photo-panel{min-height:250px} }

.nav-item[data-page="staffattendance"] .nav-icon { background-image:url('../assets/nav-staffattendance.svg'); }

.school-contact-line { max-width:1180px; margin:6px auto 0; text-align:center; color:var(--text-muted); font-weight:700; font-size:12px; }

.nav-item[data-page="fees"] .nav-icon { background-image:url('../assets/nav-fees.svg'); }

/* Mobile header collision guard */
.header-left { min-width:0; flex:1; }
.header-left img.opa-logo { max-width:min(52vw,520px); }
.header-profile { flex-shrink:0; }
@media (max-width:768px) {
  .header { gap:6px; padding:0 10px; }
  .header-left { gap:6px; max-width:calc(100% - 112px); }
  .header-left img.opa-logo { width:auto; height:32px; max-width:calc(100vw - 174px); }
  .header-profile { gap:4px; }
  .header-profile .leader-photo { display:none; }
  .sync-status { width:62px; max-width:62px; padding:3px 5px; overflow:hidden; text-overflow:ellipsis; }
  .header-logout { width:38px; padding:5px 3px; font-size:0; }
  .header-logout::before { content:'Exit'; font-size:10px; }
}
@media (max-width:390px) {
  .header-left img.opa-logo { max-width:calc(100vw - 190px); height:29px; }
  .sync-status { width:54px; max-width:54px; }
}