/* ============================================================
   FDV Holding ERP — Design System
   Marca: Syne + Space Grotesk | Navy Dark Mode
   ============================================================ */

:root {
  --navy:       #0A1628;
  --navy-light: #0F1E35;
  --navy-card:  #112236;
  --navy-hover: #162840;
  --mint:       #71DEA8;
  --mint-dim:   rgba(113, 222, 168, 0.12);
  --mint-glow:  rgba(113, 222, 168, 0.06);
  --teal:       #247061;
  --teal-dim:   rgba(36, 112, 97, 0.20);
  --blue-fdv:   #0028B8;
  --white:      #FFFFFF;
  --gray:       #D2DCE5;
  --gray-dim:   rgba(210, 220, 229, 0.10);
  --black:      #0D0D0D;
  --muted:      rgba(210, 220, 229, 0.45);
  --border:     rgba(113, 222, 168, 0.10);
  --border-sub: rgba(255, 255, 255, 0.06);

  --color-ingreso: #71DEA8;
  --color-egreso:  #F06565;
  --color-neutral: #D2DCE5;
  --color-warning: #F0A52E;
  --color-info:    #5B9CF6;

  --font-title: 'Syne', sans-serif;
  --font-body:  'Space Grotesk', sans-serif;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --shadow-card: 0 2px 16px rgba(0,0,0,0.40);
  --shadow-glow: 0 0 32px rgba(113,222,168,0.06);
  --shadow-modal: 0 8px 48px rgba(0,0,0,0.60);

  --sidebar-w: 248px;
  --topbar-h:  64px;
}

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

html, body {
  height: 100%;
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button, input, select, textarea, optgroup {
  font: inherit;
  color: inherit;
}

/* ============================================================ BRAND DOT GRID */
.brand-dot-grid {
  display: grid;
  grid-template-columns: repeat(3, 8px);
  gap: 3px;
  margin-right: 4px;
}
.brand-dot-grid.sm {
  grid-template-columns: repeat(3, 5px);
  gap: 2px;
}
.brand-dot-grid span {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--mint);
  opacity: 0.5;
}
.brand-dot-grid span:nth-child(5) { opacity: 1; }
.brand-dot-grid span:nth-child(2),
.brand-dot-grid span:nth-child(4),
.brand-dot-grid span:nth-child(6) { opacity: 0.75; }
.brand-dot-grid.sm span { width: 5px; height: 5px; }

.brand-fdv {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 24px;
  color: var(--white);
  letter-spacing: -0.5px;
}
.brand-fdv.sm { font-size: 17px; }
.brand-bi { color: var(--mint); }
.brand-tagline { font-size: 11px; color: var(--muted); letter-spacing: 0.5px; }
.brand-sub { font-size: 10px; color: var(--muted); letter-spacing: 1.5px; text-transform: uppercase; }

/* ============================================================ LOGIN */
.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(ellipse at 15% 50%, rgba(36,112,97,0.25) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 20%, rgba(0,40,184,0.18) 0%, transparent 50%),
    var(--navy);
}

.login-card {
  width: min(440px, 100%);
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  display: grid;
  gap: 18px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 8px;
}

.login-title {
  font-family: var(--font-title);
  font-size: 24px;
  font-weight: 700;
  color: var(--white);
  margin-top: -4px;
}

.login-sub {
  color: var(--muted);
  font-size: 13px;
  margin-top: -10px;
}

.field-group {
  display: grid;
  gap: 7px;
}

label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--gray);
}

input, select, textarea {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--white);
  transition: border-color 0.2s, background 0.2s;
}

input::placeholder { color: var(--muted); }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--mint);
  background: rgba(113,222,168,0.04);
}

select option, select optgroup { background: #1a2d45; color: var(--white); }

.btn-primary {
  background: linear-gradient(135deg, var(--teal) 0%, #1d5c4e 100%);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 24px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  letter-spacing: 0.3px;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-block { width: 100%; justify-content: center; text-align: center; }

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--gray);
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn-secondary:hover { border-color: var(--mint); color: var(--white); }

.btn-danger {
  background: rgba(240,101,101,0.12);
  border: 1px solid rgba(240,101,101,0.35);
  color: var(--color-egreso);
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-danger:hover { background: rgba(240,101,101,0.22); }

.btn-ghost-sm {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  font-size: 12px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  width: 100%;
}
.btn-ghost-sm:hover { border-color: var(--mint); color: var(--mint); }

.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
  border-radius: var(--radius-xs);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity 0.2s;
}

.error-msg {
  color: var(--color-egreso);
  font-size: 13px;
  text-align: center;
  background: rgba(240,101,101,0.08);
  border: 1px solid rgba(240,101,101,0.25);
  border-radius: var(--radius-sm);
  padding: 10px;
}

/* ============================================================ APP SHELL */
.app-shell {
  height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  overflow: hidden;
}

/* ============================================================ SIDEBAR */
.sidebar {
  background: var(--navy-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow-y: auto;
  scrollbar-width: none;
}
.sidebar::-webkit-scrollbar { display: none; }

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 22px 16px 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-section-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  color: var(--mint);
  padding: 20px 18px 6px;
}
.sidebar-section-label.coming-soon { color: var(--muted); padding-top: 16px; }

.sidebar-nav { display: flex; flex-direction: column; gap: 2px; padding: 4px 8px; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 10px;
  background: transparent;
  color: var(--muted);
  border: none;
  border-radius: var(--radius-sm);
  text-align: left;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  font-family: var(--font-body);
}
.nav-item:hover { background: var(--gray-dim); color: var(--white); }
.nav-item.active {
  background: var(--mint-dim);
  color: var(--mint);
  font-weight: 600;
}
.nav-item.disabled {
  cursor: default;
  opacity: 0.3;
  font-size: 12px;
  padding: 6px 10px;
}
.nav-item.disabled:hover { background: transparent; color: var(--muted); }

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.8;
}
.nav-item.active .nav-icon { opacity: 1; }

.sidebar-footer {
  margin-top: auto;
  padding: 16px 10px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.user-badge { font-size: 12px; color: var(--muted); padding: 2px 4px; line-height: 1.4; }

/* ============================================================ MAIN */
.main-content {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--navy);
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 28px;
  height: var(--topbar-h);
  border-bottom: 1px solid var(--border);
  background: var(--navy-card);
  flex-shrink: 0;
}

.page-title {
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.empresa-wrap { display: flex; align-items: center; gap: 10px; }
.empresa-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.6px; color: var(--muted); }
.empresa-selector { width: 210px; }

.view-container { flex: 1; overflow: hidden; }
.view { display: none; padding: 24px 28px; overflow-y: auto; height: 100%; }
.active-view { display: block; }
.hidden { display: none !important; }

/* ============================================================ KPI GRID */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(188px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.kpi-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 20px 16px;
  position: relative;
  overflow: hidden;
  cursor: default;
  transition: border-color 0.2s;
}
.kpi-card:hover { border-color: rgba(113,222,168,0.22); }

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
}
.kpi-card.ingreso::before  { background: var(--color-ingreso); }
.kpi-card.egreso::before   { background: var(--color-egreso); }
.kpi-card.neutral::before  { background: var(--color-neutral); }
.kpi-card.warning::before  { background: var(--color-warning); }
.kpi-card.info::before     { background: var(--color-info); }

.kpi-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--muted);
  margin-bottom: 10px;
}

.kpi-value {
  font-family: var(--font-title);
  font-size: 26px;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  word-break: break-all;
}

.kpi-sub {
  font-size: 11px;
  color: var(--muted);
  margin-top: 6px;
}

.kpi-pos { color: var(--color-ingreso); }
.kpi-neg { color: var(--color-egreso); }

/* ============================================================ SECTION HEADER */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}
.section-actions { display: flex; gap: 8px; align-items: center; }

/* ============================================================ TABLE CARD */
.table-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
}

.table-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
}

.table-card-title {
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
}

.table-wrap { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; }

th {
  background: rgba(255,255,255,0.025);
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  padding: 11px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--border-sub);
  font-size: 13px;
  color: var(--gray);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(255,255,255,0.018); }

.td-monto { font-family: var(--font-title); font-weight: 700; font-size: 14px; }
.td-monto.ingreso { color: var(--color-ingreso); }
.td-monto.egreso  { color: var(--color-egreso); }
.td-right { text-align: right; }
.td-actions { display: flex; gap: 6px; justify-content: flex-end; }

.table-empty {
  text-align: center;
  color: var(--muted);
  padding: 32px;
  font-size: 13px;
}

.table-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

/* ============================================================ BADGES */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  white-space: nowrap;
}
.badge-ingreso   { background: rgba(113,222,168,0.12); color: var(--mint); }
.badge-egreso    { background: rgba(240,101,101,0.12); color: var(--color-egreso); }
.badge-activo    { background: rgba(113,222,168,0.12); color: var(--mint); }
.badge-inactivo  { background: rgba(210,220,229,0.08); color: var(--muted); }
.badge-pendiente { background: rgba(240,165,46,0.12);  color: var(--color-warning); }
.badge-pagado    { background: rgba(113,222,168,0.12); color: var(--mint); }
.badge-vencido   { background: rgba(240,101,101,0.12); color: var(--color-egreso); }
.badge-cancelado { background: rgba(210,220,229,0.08); color: var(--muted); }
.badge-pausado   { background: rgba(240,165,46,0.12);  color: var(--color-warning); }
.badge-terminado { background: rgba(91,156,246,0.12);  color: var(--color-info); }
.badge-dentro    { background: rgba(113,222,168,0.10); color: var(--mint); }
.badge-fuera     { background: rgba(240,101,101,0.10); color: var(--color-egreso); }
.badge-variable  { background: rgba(240,165,46,0.10);  color: var(--color-warning); }
.badge-abierta,
.badge-borrador,
.badge-facturada { background: rgba(91,156,246,0.12); color: var(--color-info); }
.badge-ganada,
.badge-cobrada,
.badge-enviada,
.badge-aceptada { background: rgba(113,222,168,0.12); color: var(--mint); }
.badge-perdida,
.badge-anulada,
.badge-rechazada { background: rgba(240,101,101,0.12); color: var(--color-egreso); }
.badge-parcial,
.badge-simple,
.badge-recurrente,
.badge-contrato { background: rgba(240,165,46,0.12); color: var(--color-warning); }
.badge-admin,
.badge-manager,
.badge-usuario,
.badge-media,
.badge-en-progreso { background: rgba(91,156,246,0.12); color: var(--color-info); }
.badge-alta { background: rgba(240,101,101,0.12); color: var(--color-egreso); }
.badge-baja,
.badge-listo { background: rgba(113,222,168,0.12); color: var(--mint); }
.badge-stand-by { background: rgba(210,220,229,0.08); color: var(--muted); }
.badge-lead_to_cash { background: rgba(113,222,168,0.12); color: var(--mint); }
.badge-venta_facturada,
.badge-oportunidad_vendida,
.badge-lead_oportunidad { background: rgba(91,156,246,0.12); color: var(--color-info); }
.badge-parcial { background: rgba(240,165,46,0.12); color: var(--color-warning); }

.muted { color: var(--muted); font-size: 12px; }

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 16px;
  align-items: start;
  margin-bottom: 20px;
}

.progress-wrap {
  min-width: 112px;
  height: 20px;
  position: relative;
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-xs);
  overflow: hidden;
}
.progress-bar {
  position: absolute;
  inset: 0 auto 0 0;
  background: linear-gradient(90deg, var(--teal), var(--mint));
  opacity: 0.75;
}
.progress-wrap span {
  position: relative;
  z-index: 1;
  width: 100%;
  text-align: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--white);
}

.integration-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px 14px;
}
.integration-options > label:first-child {
  grid-column: 1 / -1;
}
.check-option {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  text-transform: none;
  letter-spacing: 0;
  color: var(--gray);
}
.check-option input {
  width: 16px;
  height: 16px;
  accent-color: var(--mint);
}

/* ============================================================ FILTERS */
.filters-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  align-items: flex-end;
}
.filters-bar .field-group { flex: 1; min-width: 130px; max-width: 200px; margin: 0; }
.filters-bar .field-group label { margin-bottom: 5px; display: block; }
.filter-search { min-width: 220px !important; }

/* ============================================================ FORMS */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 16px;
}
.form-grid .wide { grid-column: 1 / -1; }
.form-grid .field-group { margin: 0; }
textarea { min-height: 72px; resize: vertical; }

.form-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding-top: 4px;
  grid-column: 1 / -1;
  border-top: 1px solid var(--border);
  margin-top: 4px;
  padding-top: 16px;
}

/* ============================================================ MODAL */
dialog {
  width: min(700px, calc(100vw - 32px));
  max-height: calc(100vh - 64px);
  background: var(--navy-card);
  border: 1px solid rgba(113,222,168,0.15);
  border-radius: var(--radius-lg);
  padding: 0;
  overflow: hidden;
  box-shadow: var(--shadow-modal);
}
dialog::backdrop {
  background: rgba(5,10,20,0.72);
  backdrop-filter: blur(4px);
}

.modal-inner { display: flex; flex-direction: column; max-height: calc(100vh - 64px); }
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-title {
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}
.btn-icon-close {
  width: 32px; height: 32px;
  display: grid;
  place-items: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  cursor: pointer;
  color: var(--muted);
  transition: border-color 0.2s, color 0.2s;
}
.btn-icon-close:hover { border-color: var(--color-egreso); color: var(--color-egreso); }
.btn-icon-close svg { width: 14px; height: 14px; }

.modal-body {
  padding: 24px;
  overflow-y: auto;
}

/* ============================================================ CHARTS PLACEHOLDER */
.chart-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.chart-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.chart-title {
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

/* Mini bar chart inline */
.mini-bars { display: flex; align-items: flex-end; gap: 5px; height: 80px; }
.mini-bar { flex: 1; border-radius: 3px 3px 0 0; min-width: 6px; cursor: pointer; transition: opacity 0.2s; }
.mini-bar:hover { opacity: 0.8; }
.mini-bar.ingreso { background: linear-gradient(to top, var(--teal), var(--mint)); }
.mini-bar.egreso  { background: linear-gradient(to top, #a03030, var(--color-egreso)); }

.chart-legend {
  display: flex;
  gap: 16px;
  margin-top: 10px;
  flex-wrap: wrap;
}
.chart-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--muted);
}
.legend-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
}

/* Saldo bar */
.saldo-bars { display: flex; flex-direction: column; gap: 10px; }
.saldo-row { display: grid; gap: 6px; }
.saldo-label { display: flex; justify-content: space-between; font-size: 12px; color: var(--gray); }
.saldo-label span:last-child { font-family: var(--font-title); font-weight: 700; color: var(--mint); }
.saldo-track { height: 6px; background: rgba(255,255,255,0.06); border-radius: 3px; overflow: hidden; }
.saldo-fill  { height: 100%; border-radius: 3px; background: linear-gradient(to right, var(--teal), var(--mint)); transition: width 0.5s ease; }

/* ============================================================ PAGOS PROXIMOS */
.pagos-list { display: flex; flex-direction: column; gap: 8px; }
.pago-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--navy);
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 12px;
}
.pago-item-left { display: flex; flex-direction: column; gap: 3px; }
.pago-item-name { font-weight: 600; color: var(--white); }
.pago-item-meta { color: var(--muted); }
.pago-item-right { text-align: right; }
.pago-item-monto { font-family: var(--font-title); font-weight: 700; color: var(--color-warning); font-size: 14px; }
.pago-item-fecha { font-size: 11px; color: var(--muted); margin-top: 2px; }

/* ============================================================ UTILITIES */
.mt-4  { margin-top: 4px; }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.text-muted { color: var(--muted); }
.text-mint  { color: var(--mint); }
.text-right { text-align: right; }
.fw-700     { font-weight: 700; }
.font-title { font-family: var(--font-title); }

.spinner {
  width: 24px; height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--mint);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 40px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-placeholder {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 120px;
  color: var(--muted);
  font-size: 13px;
}

/* ============================================================ SCROLLBAR */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(113,222,168,0.15); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(113,222,168,0.30); }

/* ============================================================ RESPONSIVE */
@media (max-width: 900px) {
  .chart-row { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
}