:root {
  --nse-navy: #3c348b;
  --nse-navy-dark: #2a2566;
  --nse-red: #e31e24;
  --nse-orange: #f58220;
  --nse-gold: #f5b800;
  --nse-bg: #f4f6fb;
  --nse-surface: #ffffff;
  --nse-border: #d8deea;
  --nse-text: #1a1f36;
  --nse-muted: #5c6478;
  --shadow: 0 4px 24px rgba(60, 52, 139, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text, var(--nse-text));
  background: var(--page-bg, var(--nse-bg));
  transition: background-color 0.35s ease, color 0.35s ease;
}

.nse-header {
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nse-header__inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.55rem 1.5rem;
  background: var(--header-bg, #ffffff);
  border-bottom: 1px solid var(--border, var(--nse-border));
  color: var(--header-text, var(--nse-text));
  transition: background-color 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

.nse-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nse-brand {
  flex-shrink: 0;
  min-width: 0;
}

.nse-brand__logo {
  display: block;
  height: 48px;
  width: auto;
  max-width: min(240px, 45vw);
  object-fit: contain;
  object-position: left center;
}

.nse-nav {
  display: flex;
  gap: 1.25rem;
  flex: 1;
}

.nse-nav__link {
  color: var(--header-text, var(--nse-navy));
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nse-nav__link:hover,
.nse-nav__link.is-active {
  color: var(--accent, var(--nse-navy-dark));
  border-bottom-color: var(--accent-bright, var(--nse-orange));
}

.nse-header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nse-theme-toggle {
  border: 1px solid var(--nse-border);
  background: var(--nse-bg);
  color: var(--nse-navy);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
}

.nse-theme-toggle:hover {
  border-color: var(--nse-orange);
  background: #fff;
}

.nse-badge {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
}

.nse-badge--live {
  background: var(--nse-red);
  color: #fff;
}

.nse-meta {
  color: var(--text-muted, var(--nse-muted));
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.nse-subnav {
  background: var(--nse-surface);
  border-bottom: 1px solid var(--nse-border);
}

.nse-subnav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 1.5rem;
  flex-wrap: wrap;
}

.nse-subnav__title {
  font-weight: 600;
  color: var(--nse-navy);
  font-size: 0.95rem;
}

.nse-tabs {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.nse-tab {
  border: 1px solid var(--nse-border);
  background: var(--nse-bg);
  color: var(--nse-navy);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.nse-tab:hover {
  border-color: var(--nse-orange);
  background: #fff;
}

.nse-tab.is-active {
  background: var(--nse-navy);
  border-color: var(--nse-navy);
  color: #fff;
}

.nse-main {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 0;
  min-height: calc(100vh - 130px);
}

.nse-sidebar {
  padding: 1rem;
  background: var(--nse-bg);
  border-right: 1px solid var(--nse-border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.nse-card {
  background: var(--nse-surface);
  border: 1px solid var(--nse-border);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  box-shadow: var(--shadow);
}

.nse-card--accent {
  border-top: 3px solid var(--nse-gold);
}

.nse-card__title {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--nse-navy);
}

.nse-card__text {
  margin: 0;
  font-size: 0.82rem;
  color: var(--nse-muted);
  line-height: 1.45;
}

.nse-code {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  background: var(--nse-bg);
  padding: 0.45rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--nse-border);
  word-break: break-all;
}

.nse-status-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
}

.nse-status-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot--ok {
  background: #2e9e5b;
}

.dot--down {
  background: var(--nse-red);
}

.nse-dashboard {
  background: #eef1f7;
  padding: 0.75rem;
  min-height: 520px;
}

.nse-frame-status {
  margin: 0 0 0.5rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  color: var(--nse-navy);
  background: #fff4f4;
  border: 1px solid #f5c2c2;
  border-radius: 6px;
}

.nse-frame-status code {
  font-size: 0.8rem;
}

.nse-dashboard iframe {
  display: block;
  width: 100%;
  height: calc(100vh - 150px);
  min-height: 480px;
  border: 1px solid var(--nse-border);
  border-radius: 8px;
  background: #f8f9fc;
  box-shadow: var(--shadow);
}

.nse-dashboard__frame--error {
  min-height: 120px;
  background: #f8f9fc;
}

.nse-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.65rem 1.5rem;
  font-size: 0.75rem;
  color: var(--text-muted, var(--nse-muted));
  background: var(--footer-bg, var(--nse-surface));
  border-top: 1px solid var(--border, var(--nse-border));
  transition: background-color 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

/* Single-column layout: no reserved sidebar column (was causing empty left gap). */
.nse-main--full {
  display: block;
  padding: 0;
  margin: 0;
  min-height: calc(100vh - 120px);
}

.nse-main--full .ops-view {
  border-radius: 0;
  margin: 0;
  width: 100%;
}

.nse-header__inner {
  padding-left: 1rem;
}

@media (max-width: 960px) {
  .nse-main {
    grid-template-columns: 1fr;
  }

  .nse-sidebar {
    display: none;
  }
}