/* =========================================
   Layout — Grid, Sidebar, App Shell
   Premium Dark Trading Design System
   ========================================= */

/* ---- App Shell ---- */
.app {
  display: flex;
  min-height: 100vh;
  position: relative;
}

/* ---- Sidebar ---- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-bg-elevated);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-raised);
  transition: width var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  will-change: width;
  overflow: hidden;
}

/* Sidebar glow accent line */
.sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  right: -1px;
  width: 1px;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(79, 172, 254, 0.3) 0%,
    rgba(79, 172, 254, 0.08) 50%,
    rgba(79, 172, 254, 0.02) 100%
  );
  pointer-events: none;
}

.sidebar-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.sidebar-brand-icon {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  color: var(--color-accent);
  filter: drop-shadow(0 0 8px rgba(79, 172, 254, 0.3));
}

.sidebar-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.sidebar-brand-name {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.sidebar-brand-sub {
  font-size: var(--text-2xs);
  color: var(--color-text-muted);
  margin-top: 3px;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  font-weight: var(--weight-medium);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(120, 145, 190, 0.1) transparent;
}

.sidebar-section-label {
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-muted);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  padding: var(--space-5) var(--space-3) var(--space-2);
  opacity: 0.6;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-soft),
    color var(--duration-fast) var(--ease-soft),
    border-color var(--duration-fast) var(--ease-soft);
  position: relative;
  white-space: nowrap;
  border: 1px solid transparent;
  user-select: none;
  text-decoration: none;
  min-height: 40px;
  -webkit-tap-highlight-color: transparent;
}

.nav-item:hover {
  background: rgba(120, 145, 190, 0.07);
  color: var(--color-text-primary);
}

.nav-item.active {
  background: var(--color-accent-dim);
  color: var(--color-accent);
  border-color: rgba(79, 172, 254, 0.15);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: -1px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--color-accent);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  box-shadow: 0 0 8px rgba(79, 172, 254, 0.4);
}

.nav-item-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.65;
  transition: opacity var(--duration-fast) var(--ease-soft);
}

.nav-item.active .nav-item-icon,
.nav-item:hover .nav-item-icon {
  opacity: 1;
}

.nav-item-badge {
  margin-left: auto;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  font-size: var(--text-2xs);
  font-weight: var(--weight-bold);
  padding: 2px 7px;
  border-radius: var(--radius-full);
  line-height: 1.6;
  letter-spacing: 0.02em;
  border: 1px solid rgba(79, 172, 254, 0.2);
}

.sidebar-footer {
  position: relative;
  padding: var(--space-3) var(--space-3);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
  background: rgba(0, 0, 0, 0.15);
}

.sidebar-sync-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-soft);
  text-decoration: none;
}

.sidebar-user:hover {
  background: rgba(120, 145, 190, 0.07);
}

.sidebar-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-accent), #5b8def);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  color: var(--color-bg-base);
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(79, 172, 254, 0.2);
  letter-spacing: 0;
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.sidebar-user-name {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-status {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 2px;
}

.sidebar-user-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-profit);
  flex-shrink: 0;
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.4);
}

/* ---- Main Content ---- */
.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  transition: margin-left var(--duration-slow) var(--ease-out);
  position: relative;
}

/* ---- Page container ---- */
.page {
  min-height: 100vh;
  padding: var(--space-8) var(--space-8);
  max-width: var(--content-max-width);
  margin: 0 auto;
  animation: fadeIn var(--duration-slow) var(--ease-out) forwards;
}

/* Landing page: full-bleed, no page constraints */
.page.page-landing {
  max-width: none;
  padding: 0;
  margin: 0;
  animation: none;
}

.page-header {
  margin-bottom: var(--space-8);
}

.page-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.page-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
  line-height: var(--leading-normal);
}

/* ---- Mobile Overlay ---- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 15, 0.72);
  backdrop-filter: blur(4px) saturate(120%);
  -webkit-backdrop-filter: blur(4px) saturate(120%);
  z-index: calc(var(--z-raised) - 1);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-soft);
  pointer-events: none;
}

/* ---- Mobile Navigation Toggle ---- */
.mobile-nav-toggle {
  display: none;
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: var(--color-bg-base);
  z-index: var(--z-raised);
  align-items: center;
  justify-content: center;
  box-shadow:
    0 4px 20px rgba(79, 172, 254, 0.3),
    0 0 40px rgba(79, 172, 254, 0.1);
  cursor: pointer;
  border: none;
  transition:
    transform var(--duration-base) var(--ease-spring),
    box-shadow var(--duration-base) var(--ease-soft);
}

.mobile-nav-toggle:hover {
  transform: scale(1.06);
  box-shadow:
    0 6px 28px rgba(79, 172, 254, 0.4),
    0 0 56px rgba(79, 172, 254, 0.15);
}

.mobile-nav-toggle:active {
  transform: scale(0.96);
}

.mobile-nav-toggle:focus-visible {
  box-shadow: var(--focus-ring);
  outline: none;
}

.mobile-nav-toggle svg {
  width: 22px;
  height: 22px;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width);
    box-shadow: var(--shadow-xl);
    z-index: calc(var(--z-raised) + 2);
  }

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

  .sidebar-overlay {
    display: block;
    z-index: calc(var(--z-raised) + 1);
  }

  .sidebar-overlay.visible {
    opacity: 1;
    pointer-events: auto;
  }

  .main {
    margin-left: 0;
  }

  .mobile-nav-toggle {
    display: flex;
  }

  .page {
    padding: var(--space-6) var(--space-4);
    padding-bottom: calc(var(--space-6) + 76px);
  }

  .page-title {
    font-size: var(--text-xl);
  }
}

@media (max-width: 480px) {
  .page {
    padding: var(--space-4) var(--space-3);
    padding-bottom: calc(var(--space-4) + 76px);
  }

  .page-title {
    font-size: var(--text-lg);
  }
}