/**
 * Energy Dashboards Layout System
 * Grid, responsive breakpoints, page structure
 *
 * Breakpoints (mobile-first):
 *   sm:  640px  — 2-col zone grid
 *   md:  768px  — site selector, full nav
 *   lg:  1024px — 3-col building cards
 *   xl:  1280px — 6-col building cards, full flow diagram
 *  2xl:  1536px — expanded history charts
 */

/* ── App Shell ───────────────────────────────────────────────────────────── */
#app {
  position: relative;
  z-index: var(--z-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ── Navigation ──────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: 56px;
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  background: rgba(8, 12, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--bg-border);
  gap: var(--space-4);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.nav__logo-dot {
  width: 8px;
  height: 8px;
  background: var(--green-bright);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--green-bright);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--green-bright); }
  50% { opacity: 0.7; box-shadow: 0 0 16px var(--green-bright); }
}

.nav__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  overflow: hidden;
}

.nav__crumb {
  font-size: 0.875rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.nav__crumb--active {
  color: var(--text-secondary);
}

.nav__crumb-sep {
  color: var(--text-dim);
  font-size: 0.75rem;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
  flex-shrink: 0;
}

.nav__user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.nav__user:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}

.nav__avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--bg-void);
  font-family: var(--font-display);
}

/* ── Page Container ─────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-6); }
}

@media (min-width: 1280px) {
  .container { padding: 0 var(--space-8); }
}

.page-header {
  padding: var(--space-6) 0 var(--space-4);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

/* ── Card Grid ───────────────────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

@media (min-width: 640px) {
  .card-grid--2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .card-grid--3 { grid-template-columns: repeat(3, 1fr); }
  .card-grid--4 { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1280px) {
  .card-grid--6 { grid-template-columns: repeat(6, 1fr); }
  .card-grid--auto {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}

/* ── Stats Strip ─────────────────────────────────────────────────────────── */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
}

@media (min-width: 640px) {
  .stats-strip { grid-template-columns: repeat(4, 1fr); }
}

/* ── Summary Bar ─────────────────────────────────────────────────────────── */
.summary-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
}

@media (min-width: 768px) {
  .summary-bar { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1280px) {
  .summary-bar { grid-template-columns: repeat(6, 1fr); }
}

/* ── Two-column layout ───────────────────────────────────────────────────── */
.layout-2col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 1024px) {
  .layout-2col { grid-template-columns: 1fr 1fr; }
  .layout-2col--wide { grid-template-columns: 2fr 1fr; }
}

/* ── Sidebar layout ──────────────────────────────────────────────────────── */
.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 1024px) {
  .layout-sidebar {
    grid-template-columns: 280px 1fr;
    align-items: start;
  }
}

/* ── Section spacing ─────────────────────────────────────────────────────── */
.section {
  padding: var(--space-6) 0;
}

.section + .section {
  border-top: 1px solid var(--bg-border);
}

/* ── Flow diagram area ───────────────────────────────────────────────────── */
.flow-diagram-wrapper {
  padding: var(--space-4) 0;
  overflow: hidden;
}

@media (max-width: 767px) {
  .flow-diagram-wrapper--full {
    display: none;
  }
  .flow-diagram-wrapper--compact {
    display: block;
  }
}

@media (min-width: 768px) {
  .flow-diagram-wrapper--full {
    display: block;
  }
  .flow-diagram-wrapper--compact {
    display: none;
  }
}

/* ── Environmental panel ─────────────────────────────────────────────────── */
.env-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

@media (min-width: 768px) {
  .env-panel {
    grid-template-columns: 180px 1fr 1fr;
    align-items: start;
  }
}

/* ── Admin table layout ──────────────────────────────────────────────────── */
.admin-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 1024px) {
  .admin-layout--sidebar {
    grid-template-columns: 240px 1fr;
  }
}

/* ── Site selector bar ───────────────────────────────────────────────────── */
.site-bar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--bg-border);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

/* ── Login page ──────────────────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  position: relative;
}

.login-card {
  width: 100%;
  max-width: 420px;
  position: relative;
  z-index: 2;
}

#login-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ── Modal overlay ───────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 12, 10, 0.8);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  width: 100%;
  max-width: 520px;
  box-shadow: var(--shadow-modal);
  animation: modal-enter 0.2s ease both;
}

@keyframes modal-enter {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}
.modal-close:hover { color: var(--text-primary); }

/* ── Toast notifications ─────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toast {
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-modal);
  animation: toast-enter 0.2s ease both;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 280px;
  max-width: 400px;
}

.toast--success { border-left: 3px solid var(--green-bright); }
.toast--error   { border-left: 3px solid var(--grid-import); }
.toast--warning { border-left: 3px solid var(--solar); }

@keyframes toast-enter {
  from { opacity: 0; transform: translateX(16px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── Empty state ─────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--text-dim);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

/* ── Error state ─────────────────────────────────────────────────────────── */
.error-state {
  text-align: center;
  padding: var(--space-12);
  color: var(--grid-import);
}