/* ═══════════════════════════════════════════════════════════════
   LOTUS ACADEMY — Layout System
   Sidebar · Topbar · Page Structure · Grid · Utilities
   ═══════════════════════════════════════════════════════════════ */

/* Lock the whole app to the viewport */
html, body {
  overflow-x: hidden;
  max-width: 100vw;
}

.app-container {
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
  max-width: 100vw;
}

/* ── Sidebar ────────────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-sidebar);
  box-shadow: -2px 0 32px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition:
    width 0.5s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.5s cubic-bezier(0.16, 1, 0.3, 1),
    background-color 0.4s ease;
  overflow-x: hidden;
  overflow-y: auto;
}

/* Subtle lotus ambient glow on sidebar */
.sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.08) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* LTR (French): sidebar on the left */
body.lang-fr .sidebar {
  right: auto;
  left: 0;
  border-left: none;
  border-right: 1px solid var(--border-sidebar);
  box-shadow: 2px 0 32px rgba(0, 0, 0, 0.3);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

/* ── Sidebar Header ──────────────────────────────────────────── */
.sidebar-header {
  padding: 20px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  min-height: 80px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.sidebar-header .logo {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(167, 139, 250, 0.3),
    0 4px 16px rgba(109, 40, 217, 0.25);
  position: relative;
  padding: 4px;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sidebar-header .logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 10px;
}

/* Fallback gradient when no img */
.sidebar-header .logo:not(:has(img)) {
  background: var(--brand-gradient);
}

.sidebar-header .logo::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.5), transparent);
  transform: skewX(-20deg);
  transition: 0.5s;
}

.sidebar-header:hover .logo::after {
  left: 150%;
}

.sidebar-header .logo:hover {
  transform: rotate(8deg) scale(1.08);
  box-shadow:
    0 0 0 1px rgba(167, 139, 250, 0.5),
    0 6px 24px rgba(109, 40, 217, 0.35);
}

.sidebar-header .school-name {
  font-family: 'Sora', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  letter-spacing: -0.02em;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar.collapsed .school-name {
  display: none;
}

/* ── Sidebar Navigation ──────────────────────────────────────── */
.sidebar-nav {
  flex: 1;
  padding: 12px 10px;
  overflow-y: auto;
  position: relative;
  z-index: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  margin-bottom: 3px;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.nav-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.0) 0%, rgba(139, 92, 246, 0.08) 100%);
  opacity: 0;
  transition: opacity 0.25s ease;
  z-index: -1;
  border-radius: var(--radius-sm);
}

body.lang-fr .nav-item::before {
  background: linear-gradient(270deg, rgba(139, 92, 246, 0.0) 0%, rgba(139, 92, 246, 0.08) 100%);
}

.nav-item:hover {
  color: var(--text-main);
  transform: translateX(-5px);
  background: var(--bg-card-hover);
}

body.lang-fr .nav-item:hover {
  transform: translateX(5px);
}

.nav-item:hover::before {
  opacity: 1;
}

.nav-item.active {
  background: linear-gradient(135deg, rgba(109, 40, 217, 0.2) 0%, rgba(139, 92, 246, 0.12) 100%);
  color: var(--sidebar-active-text);
  font-weight: 600;
  box-shadow:
    0 0 0 1px rgba(167, 139, 250, 0.25),
    0 4px 16px rgba(109, 40, 217, 0.2);
  transform: translateX(-5px);
}

body.lang-fr .nav-item.active {
  transform: translateX(5px);
}

/* Active indicator pill */
.nav-item.active::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 3px;
  background: var(--brand-gradient);
  border-radius: 4px 0 0 4px;
  box-shadow: 0 0 12px rgba(139, 92, 246, 0.6);
}

body.lang-fr .nav-item.active::after {
  right: auto;
  left: 0;
  border-radius: 0 4px 4px 0;
}

.nav-item .icon {
  width: 20px;
  text-align: center;
  flex-shrink: 0;
  font-size: 1rem;
  color: var(--text-muted);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-item.active .icon,
.nav-item:hover .icon {
  color: var(--primary);
}

.nav-item .label {
  font-size: 0.845rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.sidebar.collapsed .nav-item .label {
  display: none;
}

/* Nav section separator */
.nav-separator {
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--text-muted);
  opacity: 0.35;
  text-transform: uppercase;
  padding: 16px 13px 5px;
  white-space: nowrap;
  overflow: hidden;
  letter-spacing: 0.1em;
}

.sidebar.collapsed .nav-separator {
  display: none;
}

/* ── Sidebar Footer ──────────────────────────────────────────── */
.sidebar-footer {
  padding: 14px 14px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.sidebar-footer .user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.82rem;
  flex-shrink: 0;
  box-shadow: 0 2px 12px rgba(109, 40, 217, 0.4);
  border: 2px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition);
}

.sidebar-footer:hover .user-avatar {
  transform: scale(1.06);
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.45);
}

.sidebar-footer .user-info {
  flex: 1;
  overflow: hidden;
}

.sidebar-footer .user-name {
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-main);
}

.sidebar-footer .user-role {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 1px;
}

.sidebar.collapsed .user-info {
  display: none;
}

.sidebar-footer .logout-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 7px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-footer .logout-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.2);
  color: var(--danger-light);
  transform: translateY(-2px);
}

/* ── Sidebar Credit Footer ───────────────────────────────────── */
.sidebar-credit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border-top: 1px solid var(--border-sidebar);
  flex-shrink: 0;
}

.sidebar-credit-link {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  opacity: 0.45;
  transition: opacity 0.2s ease;
  text-decoration: none;
}

.sidebar-credit-link:hover { opacity: 0.85; }

.sidebar-credit-text {
  font-size: 0.68rem;
  color: var(--text-muted);
  opacity: 0.45;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.sidebar-credit-text:hover { opacity: 0.85; }

.sidebar.collapsed .sidebar-credit-text { display: none; }
.sidebar.collapsed .sidebar-credit { justify-content: center; gap: 8px; }

/* ── Main Content ────────────────────────────────────────────── */
.main-content {
  flex: 1;
  min-width: 0;
  max-width: 100%;
  overflow-x: hidden;
  margin-right: var(--sidebar-width);
  transition: margin-right var(--transition-slow), margin-left var(--transition-slow);
}

body.lang-fr .main-content {
  margin-right: 0;
  margin-left: var(--sidebar-width);
}

.sidebar.collapsed ~ .main-content {
  margin-right: var(--sidebar-collapsed);
}

body.lang-fr .sidebar.collapsed ~ .main-content {
  margin-right: 0;
  margin-left: var(--sidebar-collapsed);
}

/* ── Topbar ──────────────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  height: var(--topbar-height);
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.topbar .toggle-sidebar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  flex-shrink: 0;
}

.topbar .toggle-sidebar:hover {
  background: var(--bg-card-elevated);
  border-color: rgba(167, 139, 250, 0.4);
  color: var(--primary);
  transform: translateY(-1px);
}

.topbar .page-title {
  font-size: 1rem;
  font-weight: 600;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.02em;
}

.topbar .notifications-btn {
  position: relative;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.topbar .notifications-btn:hover {
  background: var(--bg-card);
  color: var(--text-main);
}

.topbar .notifications-btn .badge {
  position: absolute;
  top: 2px;
  left: 2px;
  background: var(--danger);
  color: #fff;
  font-size: 0.62rem;
  font-weight: 700;
  min-width: 16px;
  height: 16px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  box-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
}

.topbar .impersonation-bar {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.08));
  color: var(--warning-light);
  border: 1px solid rgba(245, 158, 11, 0.2);
  padding: 4px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar .impersonation-bar button {
  background: var(--primary-dark);
  color: #fff;
  border: none;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  cursor: pointer;
}

/* ── Page Content ────────────────────────────────────────────── */
.page-content {
  padding: 28px;
  max-width: 1400px;
  width: 100%;
  box-sizing: border-box;
  min-width: 0;
  overflow-x: hidden;
}

/* ── Responsive ──────────────────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 99;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(100%);
    width: var(--sidebar-width);
  }

  body.lang-fr .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  body.lang-fr .sidebar.open {
    transform: translateX(0);
  }

  .sidebar.open ~ .sidebar-overlay {
    display: block;
  }

  .main-content {
    margin-right: 0;
    margin-left: 0;
  }

  body.lang-fr .main-content {
    margin-left: 0;
    margin-right: 0;
  }

  .page-content {
    padding: 16px;
  }
}

/* ── Grid System ─────────────────────────────────────────────── */
.grid {
  display: grid;
  gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4, .grid-6 {
    grid-template-columns: 1fr;
  }
}

/* ── Utility Classes ─────────────────────────────────────────── */
.flex            { display: flex; }
.flex-wrap       { flex-wrap: wrap; }
.items-center    { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8           { gap: 8px; }
.gap-12          { gap: 12px; }
.gap-16          { gap: 16px; }
.gap-20          { gap: 20px; }
.mt-12           { margin-top: 12px; }
.mt-20           { margin-top: 20px; }
.mt-24           { margin-top: 24px; }
.mb-16           { margin-bottom: 16px; }
.mb-20           { margin-bottom: 20px; }
.mb-24           { margin-bottom: 24px; }
.text-center     { text-align: center; }
.text-left       { text-align: left; }