/* ============================================
   LAYOUT.CSS — App Shell, Sidebar, Header
   ============================================ */

/* === LOGIN PAGE === */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}
.login-page::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(26,86,219,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.login-page::after {
  content: '';
  position: absolute;
  bottom: -150px; left: -150px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(5,150,105,0.06) 0%, transparent 70%);
  border-radius: 50%;
}
.login-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-10) var(--space-10);
  width: 100%;
  max-width: 420px;
  position: relative;
  z-index: 1;
}
.login-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}
.login-logo-icon {
  width: 44px; height: 44px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: white;
  box-shadow: 0 4px 12px rgba(26,86,219,0.3);
}
.login-logo-text { font-weight: 700; font-size: 1.3rem; letter-spacing: -0.02em; }
.login-logo-sub { font-size: 0.75rem; color: var(--color-text-3); }
.login-title { font-size: 1.5rem; font-weight: 700; margin-bottom: var(--space-2); }
.login-sub { color: var(--color-text-3); font-size: 0.875rem; margin-bottom: var(--space-8); }
.login-form { display: flex; flex-direction: column; gap: var(--space-4); }

/* === APP SHELL === */
#app {
  display: flex;
  min-height: 100vh;
}

/* === SIDEBAR === */
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: width var(--transition-slow), transform var(--transition-slow);
  overflow: hidden;
}
.sidebar.collapsed { width: var(--sidebar-collapsed); }
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  flex-shrink: 0;
  overflow: hidden;
}
.sidebar-logo-icon {
  width: 32px; height: 32px;
  min-width: 32px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: white;
}
.sidebar-logo-text {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
  opacity: 1;
  transition: opacity var(--transition-base);
}
.sidebar.collapsed .sidebar-logo-text { opacity: 0; width: 0; }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-section-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-4);
  padding: var(--space-3) var(--space-3) var(--space-1);
  white-space: nowrap;
  opacity: 1;
  transition: opacity var(--transition-base);
}
.sidebar.collapsed .nav-section-label { opacity: 0; }

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 9px var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-text-2);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  position: relative;
}
.nav-item:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}
.nav-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}
.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 3px;
  background: var(--color-primary);
  border-radius: 0 3px 3px 0;
}
.nav-item-icon {
  width: 20px; height: 20px;
  min-width: 20px;
  flex-shrink: 0;
}
.nav-item-text {
  opacity: 1;
  transition: opacity var(--transition-base);
}
.sidebar.collapsed .nav-item-text { opacity: 0; width: 0; }
.nav-item-badge {
  margin-left: auto;
  background: var(--color-primary);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
  transition: opacity var(--transition-base);
}
.sidebar.collapsed .nav-item-badge { opacity: 0; }

.sidebar-bottom {
  padding: var(--space-3) var(--space-2);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}
.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(--transition-fast);
  overflow: hidden;
}
.sidebar-user:hover { background: var(--color-surface-2); }
.sidebar-avatar {
  width: 34px; height: 34px;
  min-width: 34px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
}
.sidebar-user-info { overflow: hidden; transition: opacity var(--transition-base); }
.sidebar.collapsed .sidebar-user-info { opacity: 0; width: 0; }
.sidebar-user-name { font-weight: 600; font-size: 0.875rem; color: var(--color-text); }
.sidebar-user-role { font-size: 0.72rem; color: var(--color-text-3); }

/* Sidebar collapse button */
.sidebar-toggle {
  position: absolute;
  top: 50%;
  right: -14px;
  transform: translateY(-50%);
  width: 28px; height: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-3);
  transition: all var(--transition-fast);
  z-index: 101;
  box-shadow: var(--shadow-sm);
}
.sidebar-toggle:hover { background: var(--color-surface-2); color: var(--color-text); }
.sidebar-toggle svg { transition: transform var(--transition-base); }
.sidebar.collapsed .sidebar-toggle svg { transform: rotate(180deg); }

/* === MAIN CONTENT === */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--transition-slow);
}
.main-content.sidebar-collapsed {
  margin-left: var(--sidebar-collapsed);
}

/* === HEADER === */
.header {
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: 50;
  gap: var(--space-4);
}
.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  min-width: 0;
}
.header-page-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header-breadcrumb {
  font-size: 0.75rem;
  color: var(--color-text-3);
}
.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* Market status indicator */
.market-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-3);
  padding: 4px 10px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}
.market-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-profit);
  animation: pulse 2s infinite;
}
.market-dot.closed { background: var(--color-text-4); animation: none; }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* === PAGE CONTENT === */
.page {
  flex: 1;
  padding: var(--space-6);
  display: none;
}
.page.active { display: block; }

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
  flex-wrap: wrap;
}
.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.page-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-3);
  margin-top: var(--space-1);
}
.page-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }

/* === GRID LAYOUTS === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: var(--space-5); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--space-5); }

/* === SECTION HEADER === */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}
.section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.section-title-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    z-index: 200;
  }
  .sidebar.mobile-open {
    transform: translateX(0);
    width: var(--sidebar-width);
  }
  .sidebar.mobile-open .sidebar-logo-text,
  .sidebar.mobile-open .nav-item-text,
  .sidebar.mobile-open .nav-section-label,
  .sidebar.mobile-open .sidebar-user-info { opacity: 1; width: auto; }
  .main-content { margin-left: 0; }
  .main-content.sidebar-collapsed { margin-left: 0; }
  .page { padding: var(--space-4); }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .login-box { padding: var(--space-6); }
}

/* === MOBILE OVERLAY === */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.5);
  z-index: 150;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.visible { display: block; }