/* ══════════════════════════════════════════════════════════════
   Distributed AI Economics Calculator — Equinix Design System
   ══════════════════════════════════════════════════════════════ */

:root {
  --eq-red: #E91C24;
  --eq-red-dark: #AD050C;
  --eq-red-light: #FFEBEE;
  --eq-blue: #086AE3;
  --eq-blue-dark: #00408C;
  --eq-purple-dark: #200430;
  --eq-charcoal: #2F3541;
  --eq-carbon: #5A657B;
  --eq-platinum: #8B93A3;
  --eq-chrome: #A4AAB7;
  --eq-nickel: #BDC1CA;
  --eq-titanium: #D0D2DA;
  --eq-cloud: #E1E3E7;
  --eq-silver: #F2F3F4;
  --eq-white: #FFFFFF;
  --eq-black: #000000;

  --radius: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--eq-silver);
  color: var(--eq-charcoal);
  line-height: 1.5;
  font-size: 14px;
}

/* ── Top bar ─────────────────────────────────────── */
.topbar {
  background: var(--eq-charcoal);
  color: var(--eq-white);
  padding: 12px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.topbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.topbar-brand .logo {
  width: 28px;
  height: 28px;
  background: var(--eq-red);
  border-radius: 4px;
}
.topbar-brand h1 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.3px;
}
.topbar-actions {
  display: flex;
  gap: 8px;
}

/* ── Tab bar ─────────────────────────────────────── */
.tab-bar {
  background: var(--eq-white);
  border-bottom: 2px solid var(--eq-cloud);
  padding: 0 32px;
  display: flex;
  gap: 0;
}
.tab-btn {
  padding: 10px 24px;
  border: none;
  background: none;
  font-size: 13px;
  font-weight: 500;
  color: var(--eq-carbon);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}
.tab-btn:hover {
  color: var(--eq-charcoal);
}
.tab-btn.active {
  color: var(--eq-red);
  border-bottom-color: var(--eq-red);
}

/* ── Rules panel ─────────────────────────────────── */
.rules-panel {
  max-width: 1440px;
  margin: 0 auto;
  padding: 32px;
}
.rules-content h2 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--eq-charcoal);
}
.rules-intro {
  color: var(--eq-carbon);
  margin-bottom: 24px;
  font-size: 14px;
}
.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 16px;
}
.rule-card {
  background: var(--eq-white);
  border: 1px solid var(--eq-cloud);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.rule-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--eq-charcoal);
  border-bottom: 2px solid var(--eq-red);
  padding-bottom: 8px;
}
.rule-card ul {
  list-style: none;
  padding: 0;
}
.rule-card li {
  font-size: 13px;
  color: var(--eq-carbon);
  padding: 4px 0;
  padding-left: 14px;
  position: relative;
}
.rule-card li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--eq-red);
}
.rules-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.rules-table th, .rules-table td {
  padding: 6px 10px;
  text-align: center;
  border: 1px solid var(--eq-cloud);
}
.rules-table th {
  background: var(--eq-silver);
  font-weight: 600;
  color: var(--eq-charcoal);
}
.rules-table td {
  color: var(--eq-carbon);
}

/* ── Layout ──────────────────────────────────────── */
.app-layout {
  display: flex;
  max-width: 1440px;
  margin: 0 auto;
  min-height: calc(100vh - 52px);
}
.sidebar {
  width: 220px;
  background: var(--eq-white);
  border-right: 1px solid var(--eq-cloud);
  padding: 20px 0;
  flex-shrink: 0;
  position: sticky;
  top: 52px;
  height: calc(100vh - 52px);
  overflow-y: auto;
}
.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  color: var(--eq-carbon);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all 0.15s;
}
.sidebar-nav a:hover {
  background: var(--eq-silver);
  color: var(--eq-charcoal);
}
.sidebar-nav a.active {
  background: var(--eq-red-light);
  color: var(--eq-red);
  border-left-color: var(--eq-red);
  font-weight: 600;
}
.sidebar-nav .section-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--eq-cloud);
  color: var(--eq-carbon);
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}
.sidebar-nav a.active .section-num {
  background: var(--eq-red);
  color: var(--eq-white);
}

.main-content {
  flex: 1;
  padding: 24px 32px;
  min-width: 0;
}

/* ── Section cards ───────────────────────────────── */
.section-card {
  background: var(--eq-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 24px;
  overflow: hidden;
}
.section-card.disabled {
  opacity: 0.4;
  pointer-events: none;
}
.section-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--eq-cloud);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.section-header h2 {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-header .badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  text-transform: uppercase;
}
.badge-always { background: #E8F5E9; color: #2E7D32; }
.badge-workload { background: #E3F2FD; color: #1565C0; }
.badge-infra { background: #FFF3E0; color: #E65100; }

.section-body {
  padding: 20px 24px;
}

/* ── Form fields ─────────────────────────────────── */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.form-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--eq-carbon);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.form-group input,
.form-group select {
  padding: 8px 12px;
  border: 1px solid var(--eq-nickel);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--eq-charcoal);
  background: var(--eq-white);
  transition: border-color 0.15s;
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--eq-red);
  box-shadow: 0 0 0 3px rgba(233,28,36,0.1);
}
.form-group input[readonly] {
  background: var(--eq-silver);
  color: var(--eq-platinum);
}

/* ── Mode toggle ─────────────────────────────────── */
.mode-toggle {
  display: flex;
  gap: 0;
  border: 2px solid var(--eq-cloud);
  border-radius: var(--radius);
  overflow: hidden;
}
.mode-toggle label {
  padding: 8px 20px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--eq-carbon);
  background: var(--eq-white);
  transition: all 0.15s;
  text-transform: none;
  letter-spacing: 0;
  flex: 1;
  text-align: center;
}
.mode-toggle input { display: none; }
.mode-toggle input:checked + label {
  background: var(--eq-red);
  color: var(--eq-white);
  border-color: var(--eq-red);
}

/* ── Segmented control ───────────────────────────── */
.segmented {
  display: flex;
  gap: 0;
  border: 1px solid var(--eq-nickel);
  border-radius: var(--radius);
  overflow: hidden;
}
.segmented label {
  padding: 6px 10px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  color: var(--eq-carbon);
  background: var(--eq-white);
  border-right: 1px solid var(--eq-nickel);
  transition: all 0.15s;
  flex: 1;
  text-align: center;
  text-transform: none;
  letter-spacing: 0;
}
.segmented label:last-child { border-right: none; }
.segmented input { display: none; }
.segmented input:checked + label {
  background: var(--eq-charcoal);
  color: var(--eq-white);
}

/* ── Data tables ─────────────────────────────────── */
.data-table-wrap {
  overflow-x: auto;
  margin: 12px 0;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th {
  background: var(--eq-silver);
  padding: 8px 12px;
  text-align: left;
  font-weight: 600;
  color: var(--eq-carbon);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  border-bottom: 2px solid var(--eq-cloud);
  white-space: nowrap;
}
.data-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--eq-cloud);
  vertical-align: middle;
}
.data-table td input,
.data-table td select {
  padding: 6px 8px;
  border: 1px solid var(--eq-nickel);
  border-radius: 4px;
  font-size: 13px;
  width: 100%;
  min-width: 80px;
}
.data-table td input:focus,
.data-table td select:focus {
  outline: none;
  border-color: var(--eq-red);
}
.data-table td.cost-cell {
  font-weight: 600;
  color: var(--eq-blue-dark);
  text-align: right;
  white-space: nowrap;
}
.data-table .total-row td {
  font-weight: 700;
  border-top: 2px solid var(--eq-charcoal);
  background: var(--eq-silver);
}
.data-table .col-header-group {
  background: var(--eq-charcoal);
  color: var(--eq-white);
  text-align: center;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── Subsection headers ──────────────────────────── */
.subsection {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--eq-cloud);
}
.subsection:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}
.subsection h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--eq-charcoal);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Buttons ─────────────────────────────────────── */
.btn {
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary {
  background: var(--eq-red);
  color: var(--eq-white);
}
.btn-primary:hover {
  background: var(--eq-red-dark);
}
.btn-secondary {
  background: var(--eq-white);
  color: var(--eq-charcoal);
  border: 1px solid var(--eq-nickel);
}
.btn-secondary:hover {
  background: var(--eq-silver);
}
.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}
.btn-add {
  background: none;
  color: var(--eq-blue);
  border: 1px dashed var(--eq-blue);
  font-size: 12px;
  padding: 6px 12px;
  cursor: pointer;
  border-radius: var(--radius);
  margin-top: 8px;
}
.btn-add:hover {
  background: #E3F2FD;
}
.btn-remove {
  background: none;
  border: none;
  color: var(--eq-platinum);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 6px;
}
.btn-remove:hover {
  color: var(--eq-red);
}

/* ── Cost estimation panel ───────────────────────── */
.cost-panel {
  background: var(--eq-purple-dark);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--eq-white);
}
.cost-panel h2 {
  font-size: 18px;
  margin-bottom: 16px;
}
.cost-period-toggle {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.period-btn {
  padding: 6px 16px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 4px;
  background: transparent;
  color: rgba(255,255,255,0.6);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.period-btn:hover {
  border-color: rgba(255,255,255,0.4);
  color: rgba(255,255,255,0.8);
}
.period-btn.active {
  background: rgba(255,255,255,0.15);
  border-color: var(--eq-red);
  color: var(--eq-white);
}
.cost-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.cost-column {
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 16px;
}
.cost-column h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 12px;
}
.cost-column .cost-value {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 4px;
}
.cost-column .cost-period {
  font-size: 11px;
  color: rgba(255,255,255,0.5);
}
.cost-column.cloud { border-left: 4px solid var(--eq-chrome); }
.cost-column.equinix { border-left: 4px solid var(--eq-red); }

.cost-breakdown {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 20px;
}
.cost-breakdown-item {
  padding: 10px;
  background: rgba(255,255,255,0.05);
  border-radius: 4px;
}
.cost-breakdown-item .label {
  font-size: 11px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 4px;
}
.cost-breakdown-item .values {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}
.cost-breakdown-item .cloud-val { color: var(--eq-chrome); }
.cost-breakdown-item .eq-val { color: var(--eq-red-light); }

.saving-banner {
  background: rgba(233,28,36,0.15);
  border: 1px solid rgba(233,28,36,0.3);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.saving-banner .saving-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 4px;
}
.saving-banner .saving-amount {
  font-size: 32px;
  font-weight: 700;
  color: var(--eq-red);
}
.saving-banner .saving-period {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
}

/* ── Location grid ───────────────────────────────── */
.location-grid {
  display: grid;
  grid-template-columns: auto repeat(3, 100px);
  gap: 8px;
  align-items: center;
  margin-top: 12px;
}
.location-grid .loc-label {
  font-size: 13px;
  font-weight: 500;
}
.location-grid .loc-header {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--eq-carbon);
  text-align: center;
}
.location-grid input {
  padding: 6px 8px;
  border: 1px solid var(--eq-nickel);
  border-radius: 4px;
  text-align: center;
  font-size: 13px;
  width: 100%;
}

/* ── Export dropdown ─────────────────────────────── */
.export-dropdown {
  position: relative;
  display: inline-block;
}
.export-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  background: var(--eq-white);
  border: 1px solid var(--eq-nickel);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  z-index: 200;
  min-width: 150px;
  margin-top: 4px;
  overflow: hidden;
}
.export-menu.open {
  display: block;
}
.export-menu button {
  display: block;
  width: 100%;
  padding: 8px 16px;
  background: none;
  border: none;
  text-align: left;
  font-size: 13px;
  font-weight: 500;
  color: var(--eq-charcoal);
  cursor: pointer;
  transition: background 0.1s;
}
.export-menu button:hover {
  background: var(--eq-silver);
}
.export-menu button + button {
  border-top: 1px solid var(--eq-cloud);
}

/* ── Data movement defaults ──────────────────────── */
.dm-defaults {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}
.dm-default-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--eq-carbon);
}
.dm-defaults select {
  padding: 6px 10px;
  border: 1px solid var(--eq-nickel);
  border-radius: 4px;
  font-size: 13px;
}
.dm-default-hint {
  font-size: 11px;
  color: var(--eq-platinum);
  font-style: italic;
}

/* ── Breakdown sections (separated Cloud / Equinix) ── */
.breakdown-section {
  margin-bottom: 16px;
}
.breakdown-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.breakdown-title.cloud-title {
  color: var(--eq-chrome);
}
.breakdown-title.equinix-title {
  color: var(--eq-red);
}
.cost-breakdown-item.equinix-item {
  background: rgba(233,28,36,0.08);
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 1024px) {
  .sidebar { display: none; }
  .main-content { padding: 16px; }
  .cost-comparison { grid-template-columns: 1fr; }
  .cost-breakdown { grid-template-columns: 1fr 1fr; }
}