:root{--bg:#f4f7fb;--dark:#0b1f4d;--card:#fff;--muted:#64748b;--blue:#2563eb;--green:#16a34a;--red:#dc2626;--amber:#d97706;--border:#e5e7eb}
*{box-sizing:border-box}
body{margin:0;font-family:Segoe UI,Arial,sans-serif;background:var(--bg);color:#111827}

/* ── SIDEBAR ── */
.sidebar{
  position:fixed;left:0;top:0;
  width:245px;height:100vh;
  background:var(--dark);color:#fff;
  padding:20px;overflow-y:auto;
  scrollbar-width:thin;scrollbar-color:#2563eb #0b1f4d;
}
.brand{font-size:21px;font-weight:800;margin-bottom:24px}
.brand small{display:block;color:#93c5fd;font-size:12px;margin-top:4px}

/* ── NAV ── */
.nav a{
  display:block;color:#dbeafe;text-decoration:none;
  padding:12px 14px;border-radius:12px;margin:6px 0;
  transition:.25s;font-weight:600;font-size:15px;
}
.nav a:hover,.nav a.active{
  background:linear-gradient(90deg,#2563eb,#16a34a);
  color:#fff;transform:translateX(4px);
  box-shadow:0 10px 25px rgba(37,99,235,.35);
  border-left:4px solid #fff;font-weight:700;
}

/* ── MAIN / TOPBAR ── */
.main{margin-left:245px;padding:24px}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}

/* ── CARDS ── */
.card{
  background:#fff;border-radius:14px;padding:16px;
  box-shadow:0 4px 14px rgba(15,23,42,.07);margin-bottom:14px;
}
.card h3{margin-top:0;color:#0b1f4d;font-size:15px}
.stat{font-size:32px;font-weight:800;color:#0b1f4d}

/* ── GRID / TABLE / BTN / FORM / PILL ── */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.muted{color:var(--muted)}
table{width:100%;border-collapse:collapse;background:#fff;border-radius:14px;overflow:hidden}
th,td{padding:12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
th{background:#f8fafc;color:#334155}
.btn{
  display:inline-block;
  background:linear-gradient(90deg,#2563eb,#16a34a);
  color:#fff;padding:8px 12px;border-radius:10px;
  text-decoration:none;border:0;cursor:pointer;font-weight:600;margin:2px;
}
.btn.green{background:var(--green)}
.btn.red{background:var(--red)}
.btn.gray{background:#64748b}
.btn.amber{background:var(--amber)}
.form input,.form select,.form textarea{
  width:100%;padding:10px;border:1px solid #cbd5e1;
  border-radius:10px;margin:6px 0 14px;
  font-size:15px;font-family:inherit;
}
.form label{font-weight:600}
.flash{padding:12px;border-radius:12px;margin-bottom:16px;background:#dcfce7;color:#166534}
.flash.error{background:#fee2e2;color:#991b1b}
.pill{display:inline-block;padding:5px 9px;border-radius:999px;font-size:12px;font-weight:700;background:#e5e7eb}
.pill.active,.pill.paid,.pill.closed{background:#dcfce7;color:#166534}
.pill.suspended,.pill.overdue{background:#fee2e2;color:#991b1b}
.pill.pending,.pill.open{background:#fef3c7;color:#92400e}
.pill.pendiente{background:#ede9fe;color:#5b21b6}
pre{background:#0b1220;color:#e2e8f0;padding:15px;border-radius:14px;overflow:auto}

/* ── LOGIN ── */
.login-page{background:linear-gradient(135deg,#0b1f4d,#2563eb,#16a34a);min-height:100vh}
.login{
  max-width:460px;margin:6vh auto;
  background:rgba(255,255,255,.96);backdrop-filter:blur(20px);
  border-radius:28px;padding:30px;
  box-shadow:0 20px 50px rgba(0,0,0,.25);
}
.logoBox{text-align:center;margin-bottom:20px}
.login h1{margin:10px 0;color:#0b1f4d}
.login .btn{width:100%;padding:14px;font-size:16px}
.login input{height:48px;font-size:15px}

/* ── CHARTS ── */
.chart-card{min-height:240px}
.chart-container{position:relative;height:180px}

/* ── NAV GROUPS (menú desplegable) ── */
.nav-group{margin:4px 0}
.nav-group-title{
  display:flex;justify-content:space-between;align-items:center;
  width:100%;border:none;cursor:pointer;
  background:rgba(255,255,255,.06);color:#dbeafe;
  font-weight:700;font-size:15px;font-family:inherit;text-align:left;
  padding:11px 14px;border-radius:12px;transition:.2s;
}
.nav-group-title:hover{background:rgba(255,255,255,.12)}
.nav-group-title .arr{transition:transform .25s;font-size:12px;opacity:.7}
.nav-group.open .nav-group-title .arr{transform:rotate(180deg)}
.nav-group-items{
  display:none;margin:2px 0 4px 10px;
  border-left:2px solid rgba(255,255,255,.15);padding-left:6px;
}
.nav-group.open .nav-group-items{display:block}
.nav-group-items a{padding:9px 12px;margin:3px 0;font-size:14px}

/* ── HAMBURGER + OVERLAY ── */
.menu-toggle{
  display:none;position:fixed;
  top:12px;left:12px;z-index:1101;
  width:44px;height:44px;
  border:none;border-radius:12px;
  background:var(--dark);color:#fff;
  font-size:20px;cursor:pointer;
  box-shadow:0 4px 14px rgba(0,0,0,.25);
  align-items:center;justify-content:center;
}
.sidebar-overlay{
  display:none;position:fixed;inset:0;
  background:rgba(0,0,0,.45);z-index:1099;
}
.sidebar-overlay.show{display:block}

/* ═══════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════ */

/* Tablet / móvil grande (≤ 1024px) — sidebar oculto + hamburguesa */
@media (max-width:1024px){

  .menu-toggle{display:flex}

  .sidebar{
    position:fixed !important;
    left:-270px;top:0;
    width:250px !important;height:100vh !important;
    z-index:1100;transition:left .28s ease;
    overflow-y:auto;padding:16px;
  }
  .sidebar.open{left:0}
  .brand img{width:90px !important;height:auto}
  .brand{padding-bottom:8px;margin-bottom:10px}
  .nav a{padding:10px 12px;margin:3px 0;font-size:14px}

  .main{margin-left:0 !important;padding:14px;padding-top:68px}

  /* 2 columnas para las stat cards */
  .grid{grid-template-columns:repeat(2,1fr) !important}

  /* Tabla: scroll horizontal con deslizamiento táctil suave */
  table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap}

  .btn{min-height:42px;padding:9px 14px}

  /* Topbar: permite wrap si el contenido es muy ancho */
  .topbar{flex-wrap:wrap;gap:8px;align-items:flex-start}
  .topbar select{font-size:13px;max-width:200px}
}

/* Tablet mediana (≤ 768px) */
@media (max-width:768px){
  .main{padding:12px;padding-top:68px}
  .card{padding:14px}
  .stat{font-size:26px}
  .topbar h2{font-size:19px}
  /* formularios: mantener 2 columnas en tablet */
  .two{grid-template-columns:1fr 1fr !important}
}

/* Móvil (≤ 600px) */
@media (max-width:600px){
  .main{padding:10px;padding-top:62px}
  .card{padding:12px}
  .stat{font-size:24px}

  /* 1 columna en celular */
  .grid{grid-template-columns:1fr !important}
  .two{grid-template-columns:1fr !important}

  /* Topbar vertical */
  .topbar{flex-direction:column;gap:4px}
  .topbar h2{font-size:17px}
  .topbar select{max-width:100%;width:100%}

  .flash{padding:10px;font-size:13px}
  .btn{min-height:44px;font-size:13px}

  .login{margin:4vh 12px;padding:20px}
}

/* Teléfono pequeño (≤ 400px) */
@media (max-width:400px){
  .main{padding:8px;padding-top:60px}
  .stat{font-size:22px}
  .card h3{font-size:13px}
}