/* ============================================
   GPS SaaS — Sistema de diseño base
   ============================================ */

:root {
  /* Colores */
  --c-bg:        #0f172a;
  --c-bg-2:      #1e293b;
  --c-surface:   #ffffff;
  --c-text:      #0f172a;
  --c-text-soft: #64748b;
  --c-border:    #e2e8f0;
  --c-primary:   #2563eb;
  --c-primary-h: #1d4ed8;
  --c-danger:    #dc2626;
  --c-success:   #16a34a;

  /* Espaciado */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;

  /* Radio */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;

  /* Sombras */
  --sh-1: 0 1px 2px rgba(0,0,0,.05);
  --sh-2: 0 4px 12px rgba(0,0,0,.08);
  --sh-3: 0 12px 32px rgba(0,0,0,.15);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--c-text);
  background: #f8fafc;
}

/* ---- Login ---- */
.login-bg {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  padding: var(--sp-4);
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--c-surface);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-3);
  padding: var(--sp-6) var(--sp-5);
}

.login-logo {
  display: block;
  width: 64px;
  height: 64px;
  margin: 0 auto var(--sp-4);
  border-radius: var(--r-md);
  object-fit: cover;
  background: #e2e8f0;
}

.login-title {
  text-align: center;
  margin: 0 0 var(--sp-2);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-text);
}

.login-sub {
  text-align: center;
  margin: 0 0 var(--sp-5);
  font-size: 14px;
  color: var(--c-text-soft);
}

/* ---- Form ---- */
.form-group { margin-bottom: var(--sp-4); }

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: var(--sp-2);
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  font-size: 15px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}

.form-input:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}

.form-check {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 13px;
  color: var(--c-text-soft);
  margin-bottom: var(--sp-4);
}

/* ---- Botón ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  width: 100%;
  padding: 11px 16px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: background-color .15s, transform .05s;
}

.btn-primary {
  background: var(--c-primary);
  color: white;
}

.btn-primary:hover { background: var(--c-primary-h); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }

/* ---- Alerta ---- */
.alert {
  padding: 10px 12px;
  border-radius: var(--r-sm);
  font-size: 13px;
  margin-bottom: var(--sp-4);
  display: none;
}

.alert-error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert.show { display: block; }